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SLM-7650 - MetFY3x Processor software

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1. M 4 28 Figure 4 6 EXT Master Clock as Source 4 29 User Provides DOtat cunun a 4 30 Figure 4 8 Internal SCT Clock Selection a 4 31 Figure 4 9 Separate Links vs Asymmetrical Loop 4 32 Fig re 1 Program u uay 5 2 Figure 5 2 Example of Upgrade File 5 3 Figure 5 3 Example of Reflash Program File Location a 5 3 Figure 5 4 Example of USB Drivers File 5 3 Figure 5 5 Modem anu S Qan bees teak 5 14 DUAL N E 5 15 1 2 2 Test 006 TERR 5 16 opress s secs mite Radon ines 5 17 2 __ _ __ _ dde G dS 5 19 Baseband Loopback uu yu Ead PRU Md quc __ HAC dS 5 20
2. pee pm pum Due eee mM T T T T Te T Temperature Conversions C F 32 0 555 32 Fahrenheit water freezes 100 C 1 8 32 212 Fahrenheit water boils 273 1 459 6 Fahrenheit absolute 0 Units of Weight Ounce Ounce Pound Pound Avoirdupois Troy Avoir Troy emo 0 03527 0 03215 0 002205 0 002679 0 001 28 35 104 1 0 9115 0 0625 0 07595 0 02835 pem ome we pee mee om p we pm ew mew ow _ pee DATA iii A SUBSIDIARY OF TELECOMMUNICATIONS CORP 2114 WEST TH STREET TEMPE ARIZONA 85281 USA 480 333 2200 PHONE 480 333 2161 FAX
3. 1 6 1 5 1 Bit Error Rate Performance with Noise c ccccsscoscosccsccsccescscescesccsccescescescescesscescescescssscescussescesees 1 8 15 2 Dimensional ClO Ne om 1 10 CHAPTER 2 INSTALLATION 22 2 1 2 1 kinpa u u u M 2 1 2 2 uu He rv 2 2 2 24 uuu uu u u _____6_6 __6_6_ 6______6 6_8___ 2 2 22 gt HxternalNiodent Conte TOTIS uu 2 ui 46 u __ _ ______ _______6_6___ 2 2 SLM 7650 Satellite Modem Revision 4 Preface MN SLM7650 IOM CHAPTER OPERATION i uyu uy ua is ERN IDA 3 1 3 1 Front irem 3 1 IEL PPD REM 3 2 221522 dDronpPanebieyDado yuy po usun c EM E 3 2 32 Front Panel Operaio aaa umasapa doo 3 3 S Front Panel Menu 25555525 INN UU 3 3 32 2 MM 3 5 3 3 Digital Data Rate and Symbol Rate 3 6 3 4 ha di e 3 8 SE
4. Figure 5 6 DUAL Test Mode SLM 7650 Satellite Modem Revision 4 Maintenance 5 3 1 3 5 3 1 4 MN SLM7650 IOM 10 dB 13 20 dR D V Figure 5 7 OFFSET Test Mode Spurious using a Spectrum Analyzer 1 2 Continue from previous step and change Spectrum Analyzer frequency span to cover the frequency range of 0 to 500 MHz Verify there are no spurious signals above the specified level Output Frequency 2 3 Continue from the previous step and in the Configuration Modulator menu set the Carrier Mode to CENTER Figure 5 8 Connect IF output to a Frequency Counter that 15 referenced to the same frequency reference that 1s connected to the modulator Verlfy that the output frequency of the modulator 15 within the tolerance listed In the specification Set the Carrier Mode to Normal Modulated Turn the TX IF Output ON SLM 7650 Satellite Modem Revision 4 Maintenance MN SLM7650 IOM pt LLL LLL LLL _ LL _ L LLL A OA __ CENTER 706 02 SPAN 5 020 MHz 51 1 542 20 Figure 5 8 CENTER Test Mode 5 3 1 5 Power Level Continue from the previous step and connect the IF output to a Power Meter In the Configuration Modulator menu set the TX Power Level to 10 dBm Verlfy that the Power Meter Indicates an output power between 9 5 and 10 5 dBm Change the TX Power Level
5. gt add ACT add ACT cr gt add ACT 1 19 Where 110 150 300 600 1200 2400 4800 9600 19200 38400 Note ASYNC Overhead only Where 110 150 300 600 1200 2400 4800 9600 19200 38400 Note RX ASYNC only Where n 7 or 8 bits Note TX ASYNC Overhead only Where n 1 or 2 Stop bits Note TX ASYNC Overhead only Where xxxx ODD EVEN or NONE Note TX ASYNC Overhead only Where n 7 or 8 bits Note RX ASYNC Overhead only Where n 1 or 2 Stop bits Note RX ASYNC Overhead only Where xxxx ODD EVEN or NONE Note RX ASYNC Overhead only Where xxxxxxxx RS232 RS485 4 Wire or RS485_2W 2 Wire Note ASYNC Overhead only SLM 7650 Satellite Modem Revision 4 Remote Control Specifications MN SLM7650 IOM 11 System Configuration 5 Time Of Day Command lt add TIME_hh mm ss cr Where Response add TIME hh mm ss cr If hh 0 to 23 hours mm 00 to 59 minutes Status lt add TIME_ cr ss 00 to 59 seconds Response gt add TIME_hh mm ss cr If Date Command add DATE mm dd yyyy cr Where Response gt mmyv dd ttyy cr If mm 1 to 12 month Status add DATE Response add DATE mm dd yyyy cr If dd 1 to 31 day yyyy 2000 to 2099 year Remote Command add REM Configu
6. 1 8V PLL_xxx cr ACT xxx cr If add IASF gt add IASF_ hh mm ss MM DD YYY Y cr 1 xxx cr TXBWA2 xxx cr xxx cr TXBWAA xxx cr 1 xxx cr RXBWA2 xxx cr xxx cr RXBWAA xxx cr If A 50 Revision 4 51 7650 1 Module OK FLT Buffer Clock PLL Lock OK FLT Selected Buffer Clock Activity OK FLT Receive Data Loss AIS OK FLT Demux Reed Solomon Lock OK FLT 2047 Pattern Lock Detect OK FLT Buffer Overflow OK FL T Buffer Underflow OK FLT Buffer Full OK FLT D amp I Insert OK FLT Receive Backward Alarm OK FLT Frame BER OK FLT M amp C OK FLT Battery Clock OK FLT 12 Volt Level OK FLT 12 Volt Level OK FLT 5 Volt Level OK FLT 3 3 Volt Level OK FLT 2 5 Volt Level OK FLT 1 8 Volt Level OK FLT Temperature OK FLT Modem Reference PLL OK FLT Modem Reference Activity OK FLT TX Backward Alarm 1 TX Backward Alarm 2 TX Backward Alarm 3 TX Backward Alarm 4 RX Backward Alarm 1 RX Backward Alarm 2 RX Backward Alarm 3 RX Backward Alarm 4 OK FLT OK FLT OK FLT OK FLT OK FLT OK FLT OK FLT OK FLT METRIC CONVERSIONS Units of Length Lx uw s pem mmm e sm pee pe se
7. 1 add COM cr gt _ 11 add T310 xxx cr 2add T310 xxx cr If add T310 cr 2add T310 xxx cr If add MET xxx cr gt _ 11 lt gt _ 11 add MRSC nnn add MRSC nnn i cr If add MRSC add MRSC nnn i cr If add BMC p1 p2 pn cr gt add BMC_p1 p2 pn cr If add BMC cr gt add BMC_p1 p2 pn cr If s Parameter 5 Parameter 6 Parameter 7 Parameter 8 4 51 7650 1 Where STANDARD INV STANDARD Where xxxxxx OFF NORMAL MODULATED DUAL DUAL CW OFFSET OFFSET CW CENTER CENTER CW Where xxx ON or OFF Where xxx VIT Viterbi or Turbo Where nnn kkk i 225 205 8 225 205 4 219 201 8 219 201 4 194 178 4 or 126 112 4 Note This command is valid only in modem type CUSTOM when overhead type is NONE ASYNC Status is available at all times This command causes the modulator to be programmed with supplied parameters All parameters are separated by a comma except for the last parameter which has the standard command termination character Parameters that do not need to be changed can be nulled no data between comma s Modulator RF output ref command P1 n where is
8. _ 11 add MPO 2add MPO 5 1 add MOP snn n cr gt _ 1 add MOP gt _ add SCRT 2add SCRT xxxx cr If add SCRT cr 2add SCRT xxxx cr If add SE xxx cr gt 5 xxx cr If add SE cr gt 5 xxx cr If add DENC xxx cr gt xxx cr If add DENC gt xxx cr If add MSR xxx cr 2add MSR xxx cr If add MSR cr add MSR xxx cr If Revision 4 51 7650 1 Where mmmmm mmm Data rate in KHz For CEVD FEC nnnnn 1 2 QPSK 1 2 3 4 QPSK 3 4 7 8 QPSK 7 8 BP12 BPSK 1 2 OQ12 OQPSK 1 2 OQ34 OQPSK 3 4 and OQP78 OQPSK 7 8 BPSK BPSK 1 1 QPSK QPSK 1 1 OQSK OQPSK 1 1 16Q34 16QAM 3 4 16Q78 16QAM 7 8 For FEC nnnnn 8P23 8PSK 2 3 8P56 5 6 For TPC FEC nnnnn B2144 BPSK 21 44 B516 BPSK 5 16 21 44 QPSK 21 44 3 4 QPSK 3 4 7 8 QPSK 7 8 17 18 QPSK 17 18 2002144 OQPSK 21 44 OQ34 OQPSK 3 4 and 0078 OQPSK 7 8 001718 5 17 18 8P34 8PSK 3 4 8P78 BPSK 7 8 8P1718 8PSK 17 18 16034 16QAM 3 4 16078 16QAM 7 8 Note Setting the modulator turns off the RF transmitter Where xxxx INTL INTELSAT OPEN NETWORK EFD EF DATA CLOSED NETWORK Note Invalid Parameter Error Response is returned if command is sent while in any modem type oth
9. cr If lt add IBP_xxxx cr gt add IBP_xxxx cr lf add IBP gt add IBP_xxxx cr lf add IRFS ff ssss cr add IRFS ff ssss cr If add IRFS add IRFS ff ssss cr If add ISP gt 5 1 add ISP cr add ISP 1 add IRE add IRE lt add IRE_ cr add IRE xxxxxx cr If 15 Revision 4 MN SLM7650 IOM Where xxx ON or OFF Buffer size programming is supported in two formats bits or milli seconds The selected format must be chosen using the buffer programming command IBP If the buffer is to be programmed in milli seconds and plesiochronous slips are required use the receive framing structure command IRFS to define the proper framing format Where nnnnnnn 32 to 1048576 in 16 bit increments Where nn 0 to 48 milli seconds in 1 milli second increments buffer size in milli seconds The maximum buffer size in milli seconds is data rate dependant Maximum buffer size cannot exceed 48 milli seconds or 1048576 Data Rate seconds whichever is lower Centers the buffer Where xxxx BITS or MS milli seconds Where ff T1 T2 or E2 frame type ssss NONE G704 G742 G743 G745 or G747 framing structure Notes 1 Valid T1 frame structures are NONE and G704 2 Valid T2 frame structures are NONE G704 G743 and G747 3 Valid E1 frame st
10. 5 19 B milo pun 5 20 5294 3 ______ _ __ _______ 5 21 32 44 Reed Solomon Correction OFE ee eet eee 5 22 5 34 32047 MIEASTISS LestPattertis u uu l u u ul ga Uy de 5 22 APPENDIX A REMOTE CONTROL 1 GLOSSARY oa 9 1 SLM 7650 Satellite Modem Revision 4 Preface MN SLM7650 IOM Figures T t SLM 7630 Satellite MIOGGEHL 155 aea e atl iiis 1 1 1 2 Dimensional Envelope gt 1 8 19016 251 Bear Panel o eerie RU ase E 2 2 12 15411 52524 SEM Prot Dane u 3 1 12 15411 sn RT 3 2 eur eR PH ER 3 4 Alk BOCK Daora ETUR RAS 4 2 4 2 User Provides 1 222522 1 4 25 4 3 Modem Provides 1 12 uk us tatum le 4 26 L Surel Modem locks 4 27 Picure4 5 Slave Modoni Loop 52010600 0
11. 5 5 s G703 cr s Dl cr If add SNUM 2add SNUM Xxxxxxxxx cr If 47 Revision 4 MN SLM7650 IOM Where SLM7650 XXX yyy Zzz Software version Where XXX yyy Zzz Software version number 1 1 1 to 999 999 999 nnnnnn Firmware number 0 to 999999 dd Firmware dash number 0 to 99 rr Firmware revision or A to ZZ Where XXX yyy Zzz Software version number 1 1 1 to 999 999 999 nnnnnn Firmware number 0 to 999999 dd Firmware dash number 0 to 99 rr Firmware revision or A to ZZ Where nnnnnn Firmware number 0 to 999999 rr Firmware revision or A to ZZ or IBS IDR Overhead or ASYNC Overhead or High Data Rate or Reed Solomon or 16QAM x or Turbo CODEC or Modulator Functionality is enabled or Demodulator Functionality is enabled x or Option G 703 50Pin x or Option D amp I ESC 5 0 Not Installed Not Upgradable Not Installed Fast Upgradable Installed x Not Installed Field Upgradable Where XXXXXXXXx Serial number 000000000 to 999999999 SLM 7650 Satellite Modem Remote Control Specifications State Of Command add SOP cr Product Response gt add SOP_ cr add cr abc cr rrrrr bps cr lt var string1 gt lt gt If 48 Revision 4 MN SLM7650 IO
12. DATA SUBSIDIARY OF TELECOMMUNICATIONS CORP SLM 7650 Satellite Modem Installation and Operation Manual Part Number MN SLM7650 IOM Revision 4 EF DATA A SUBSIDIARY OF COMTECH TELECOMMUNICATIONS CORP SLM 650 oatellite Modem Installation and Operation Manual Part Number MN SLM7650 IOM Comtech EF Data is an ISO 9001 Registered Company Revision 4 September 10 2005 Copyright Comtech EF Data 2000 2001 2002 2003 All rights reserved Printed in the USA Comtech EF Data 2114 West 7th Street Tempe Arizona 85281 USA 480 333 2200 FAX 480 333 2161 SLM 7650 Satellite Modem Revision 4 Preface MN SLM7650 IOM Customer Support Contact the Comtech EF Data Customer Support Department for e Product support or training e Information on upgrading or returning a product e Reporting comments or suggestions concerning manuals Customer Support representative may be reached at Comtech EF Data Attention Customer Support Department 2114 West 7th Street Tempe Arizona 85281 USA 480 333 2200 Main Comtech EF Data Number 480 333 4357 Customer Support Desk 480 333 2161 FAX or E Mail can be sent to the Customer Support Department at service comtechEF Data com Contact us via the web at www comtechEF Data com 1 To return a Comtech EF Data product in warranty and out of warranty for repair or replacement 2 Requesta Return Ma
13. add DT gt add DT_xxxx cr lf add DDT gt add DDT_ xxx cr If add DDT gt add DDT_xxx cr lf 10 Revision 4 MN SLM7650 IOM IESS OM73 or TURBO ON or OFF XXX ON or OFF xxx ON or OFF snnnnn 35000 to 35000 in 1 Hz steps 0 to 70000 in 1 Hz steps XXX 0 to 999 number of seconds Where xxxx 1E n where n 3 4 5 6 7 8 exponent of threshold Where xxxx INTL INTELSAT OPEN NETWORK EF DATA CLOSED NETWORK Note Invalid Parameter Error Response is returned if command is sent while in any modem type other than Custom Status can always be sent Where xxx VIT Viterbi or TUR Turbo SLM 7650 Satellite Modem Revision 4 Remote Control Specifications MN SLM7650 IOM Demodulator Command add DSR Where xxx NRM normal spectrum or INV inverted Spectrum Response gt add DSR_ xxx cr lf spectrum Rotation Status lt add DSR_ cr Response gt add DSR_ xxx cr lf Reed Command add RSDE xxx cr Where xxx ON or CORR_OFF Solomon Response gt add RSDE_ xxx crif Decoder Enable Status add RSDE Response gt add RSDE_ xxx cr lf Receive Command add RDA xxx cr Where xxx NRM STANDARD or INV NON BPSK Data Response 2add RDA xxx cr If STANDARD Ordering Status add RDA Response 2
14. to indicate that the receive signal level is less than or greater than the returned value 5 or receive signal level sign plus or minus nn n 0 0 to 99 9 receive signal level magnitude Notes The lt gt parameter is only returned if the level has exceeded the computational resolution of the system Data is returned if the level cannot be calculated Sampling is returned if not enough data is currently available to calculate the level Interface Command lt add IBFS_ cr Where nn 1 to 99 relative to buffer depth Buffer Fill Response add IBFS nn9 cr If otatus Current Command add CSV cr Where Sweep Response add CSV Value CD yyy cr If x lt or gt data modifier to indicate that the sweep offset value is less than or greater than the returned value S or sweep offset from center nnnnn 0 to 35000 yyy OK or FLT decoder lock status OK or FAULT Notes The lt gt parameter is only returned if the level has exceeded the computational resolution of the system No Data is returned if the level cannot be calculated Sampling is returned if not enough data is currently available to calculate the level 35 SLM 7650 Satellite Modem Remote Control Specifications A 18 Bulk Status Bulk Command add BCAS Consol Response gt add BCAS_p1 p2 p3 pn or lf Analog Status Where pn is t
15. J 26 ASYNC RX Stop Bits ref command P26 n where n is 1 or 2 bits 27 ASYNC RX Parity ref ROCP command P27 n where is 0 NONE T EVEN 2 Parameter 29 T1 Frame Structure ref IRFS_ command P29 n where n is 0 NONE 1 G 704 Parameter 30 E1 Frame Structure ref IRFS command P30 n where n is 0 NONE or 1 G 704 Parameter 31 T2 Frame Structure ref IRFS_ command P31 n where n is 0 T G 704 3 G 743 5 G 747 Parameter 32 E2 Frame Structure ref IRFS_ command P32 n where n is 0 T G 704 2 G 742 4 G 745 12 SLM 7650 Satellite Modem Revision 4 Remote Control Specifications MN SLM7650 IOM Parameter 33 Demod RS Codeword ref DRSC_ command P33 n where n is RS 225 205 10 depth 8 T RS 225 205 10 depth 4 2 RS 219 201 9 depth 8 3 RS 219 201 9 depth 4 4 RS 194 178 8 depth 4 5 RS 126 112 7 depth 4 vium ram command P34 n where n is 0 AMI 1 8625 2 8825 3 HDB3 C D 35 Interface Service Channel Level RX1 ref ISCL RX1 command P35 snn n where snn n is 6 0 to 8 0 in steps of 2 dB 0 Interface Service Channel Level RX2 ref ISCL_RX2_ command P36 snn n where snn n is 6 0 to 8 0
16. Modem User User Figure 4 3 Modem Provides Clock 4 26 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 4 3 3 2 3 Timing Configuration 3 Modem Clocks Internally Modem Reference clock is either INT 1 5 10 or 20 MHz TX Clock source INT Buffer clock also is using INT This user is using the internal modem clock ST as the system clock Figure 4 4 WARNING This mode is not recommended for operation at higher data rates The modulator will be clocking the send data for transmission to the satellite with the same Dmm internal oscillator that is providing the timing to the DTE equipment Installation variations can cause varying delay between the internal SCT and the incoming send data There will be data rate verses cable length combinations that will not operate with the normal transmit clock phase setting There are setup options to overcome these situations 1 If Transmit Element Timing from the DTE TT 15 available use the selection for the TX Clock source 2 If TT 1s not available use the TX Clock Phase selection to operate in Normal or Invert mode One of these phases will operate properly ST User clocks TT and SD from ST NE RT clocks in the RD Buffer N Internal clock 1 5 10 or 20 MHz Reference detect To TX IF Output Clock Master Modem User
17. The symbol rate 15 2 3 of the data rate for 3 4 4 3 4 3 Offset QPSK Offset Quaternary Phase Shift Keying 15 vartation of QPSK The offset prevents any succession of symbols going through the zero point of the quadrature The RF envelope will not collapse when the modulation format is set to OQPSK It is possible to operate high power amplifiers with less then 1 recommended back off when using this type of modulation 4 3 4 4 8 PSK 8 Phase Shift Keying Pragmatic trellis coded modulation encoding is used to transmit baseband data for 8 phase shift keying Eight discrete phase angles represent the 8 possible symbol combinations of three bits symbol rate for 2 3 a rate 8PSK is 1 2 of the data rate The symbol rate for 5 6 5 FEC 8PSK 15 3 5 of the data rate Reed Solomon is recommended to achieve acceptable performance 4 10 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 3 4 5 16 QAM 16 phase Quaternary Amplitude Modulation The modulator Bow amp generates a constellation with 16 discrete phase states for 16 QAM There is large reduction of the symbol rate when using 16 5 4 3 5 4 3 6 symbol rate 3 4 15 1 3 of the data rate This severe id Lalo reduction in symbol rate requires more power on the satellite transponder Reed
18. _ lt lt lt olol o 9 lt S IS s 2 325 srl Eikii 2 2559 0 lt 5 O O O lt oe O gt x gt Ol O 215101 lt OQ gt OI O m F 9 9 Revision 4 MN SLM7650 IOM SLM 7650 Satellite Modem Maintenance 2 anosa sal lt 5 5555 4445 241 11 psc _ __ _ lx Evrae 22 bel __ _ x Amma wew Monssanznvaxe fel x ox x Amna aanva L L 1K Table 5 1 SLM 7650 Fault Tree Cont BS Backward Alarm Frame BER 3 3 Volt 2 5 Volt Modem Reference PLL Modem Reference Activity 5 LLI c Buffer Clock Activity PARAMETER RX Interface Faults Buffer Clock PLL RX Data AIS Demux Lock Buffer Ov
19. command Where nnnnn n 9 6 to 20000 0 external clock frequency in KHz Note Specifies the frequency of External Master Clock input Where xxx NRM normal clock phasing or INV inverted clock phasing Where xxx INT internal clock EXT external TX terrestrial clock SAT receive satellite clock REF external clock reference frequency or INS insert clock Where xxx NRM normal clock phasing or INV inverted clock phasing Where xxx ON or OFF SLM 7650 Satellite Modem Remote Control Specifications Interface Loop Timing Interface Buffer Size Interface Buffer Size Bit Format Interface Buffer Size Milli second Format Interface Buffer Center Interface Buffer Programming Interface Receive Framing Structure Interface Substitute Pattern Interface Read Error Select Command Response Status Response Command Response Status Response Command Response Status Response Command Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response add ILT xxx cr add ILT xxx cr If add ILT add ILT xxx cr If add IBS nnnnnnn cr add IBS nnnnnnn cr If add IBS cr add IBS nnnnnnn cr If add IBS nn cr nn cr If add IBS cr add IBS nn cr If lt
20. 1 INV Parameter 15 Receive BPSK Data Ordering ref RDA command P15 n where n is 0 1 0 1 INV Parameter 16 Buffer Programming Mode P16 n where n is 0 1 0 BITS 1 MILLISECONDS Parameter 17 Buffer Size ref IBS command P17 nnnnnn where nnnnnn 32 to 1048576 bits p16 0 1to48 ms p16 1 Parameter 18 Sweep Reacquisition ref SR command P18 nnn where nnn 0 to 999 seconds Parameter 19 Interface Read Error Select ref IRE P19 n where n is 0 to 2 O OFF 1 2047 ON 2 MIL188 Parameter 20 Receive data fault ref RDF_ command P20 where is 1 to 2 O NONE 1 DATA 2 AlS 21 Descrambler Type ref command P21 n where n 0 IESS 1 OM73 2 TURBO kus 22 Sweep Center Frequency ref 5 command P22 snnnnn where snnnnn is the sweep center frequency in Hz 23 IF Loopback ref IFL command P23 n where n is 0 to indicate off or 1 to indicate ks 24 ASYNC RX Baud Rate ref ROBR_ command P24 n where n is 0 110 baud T 150 baud 2 300 baud 3 600 baud 4 1200 baud 5 2400 baud 6 4800 baud 7 9600 baud 8 19200 baud 9 38400 baud Parameter 25 ASYNC RX Character Length ref RCCL command P25 n where n is 7 or 8 bits
21. Command Response Status Response Command Response Status Response add ITOT xxxxx cr add ITOT RF OFF cr If add ITOT cr add ITOT xxxxx cr If add IROT xxxxx cr gt add lIROT_ 11 add IROT cr 2add IROT 1 add TC add TC xxxx cr If add TC cr add TC xxxx cr If add MSPR xxx cr 2add MSPR add MSPR gt add MSPR_xxx cr If add ERF nnnnn n cr gt nnnnn n cr If add ERF cr gt nnnnn n cr If add TCP xxx cr gt add TCP cr gt 1 add BC xxx cr add BC xxx cr If add BC cr add BC xxx cr If add RCP xxx cr 2add RCP add RCP cr 2add RCP add BBL xxx cr add BBL 1 add BBL cr add BBL xxx cr f A 14 Revision 4 51 7650 1 Where IDR IBS DI ASYNC 185 309 VSAT IBS Where xxxxx NONE IDR IBS DI ASYNC IBS 309 or VSAT IBS Where xxxx INT internal SCT clock EXT external TX terrestrial clock or DATA data clock sync Where XXX MR modem reference ERF external clock Default is When transmit clock source is selected as DATA the ST Reference Clock Source defaults to DATA no matter what MSPR parameter is selected See
22. Interface receive side faults character 3 Bit 6 1 always Bit 5 Buffer underflow Bit 4 Buffer overflow Bit 3 Buffer full Bit 2 insert fault Bit 1 receive backward alarm Bit 0 Frame BER Character Common equipment fault status character 1 Bit 6 1 always Bit 5 Monitor amp Control Module Bit 4 reserved Bit 3 through Bit 0 Binary representation 0 to 10 of the number of common equipment stored faults Character Common equipment fault status character 2 Bit 6 1 always Bit 5 Battery Clock Bit 4 12V power supply Bit 3 12V power supply Bit 2 5V power supply Bit 1 3 3V power supply Bit 0 2 5 power supply Character o Common equipment fault status character 3 Bit 6 1 always Bit 5 1 8V power supply Bit 4 Temperature Bit 3 Modem reference PLL Bit 2 Modem reference activity Bit 1 reserved Bit 0 reserved Character p Interface Backward Alarm status character 1 45 SLM 7650 Satellite Modem Revision 4 Remote Control Specifications MN SLM7650 IOM Bit 6 1 always Bit 5 TX backward alarm 1 Bit 4 TX backward alarm 2 Bit 3 through Bit 0 Binary representation 0 to 10 of the number of backward alarm stored faults Character q Interface Backward Alarm status character 2 Bit 6 1 always Bit 5 TX backward alarm 3 Bit 4 TX backward alarm 4 Bit 3 RX backward alarm 1 Bit 2 RX backward alarm 2
23. add ICFT add ICFT xxxx cr If add ICFT add ICFT xxxx cr If add ICFR gt add ICFR cr add ICFR add ISCL xxx nnn cr add ISCL xxx 1 add ISCL add ISCL xxx 1 add DDF add DDF 1 add DDF 2add DDF 1 add IDF add IDF add IDF cr add IDF xxxxx cr lf A 16 Revision 4 MN SLM7650 IOM Where xxxx NONE DATA or AIS Where xxxx NONE DATA or AIS Where xxxx NRM normal data phasing or INV inverted data phasing Where xxx NRM normal data phasing or INV inverted data phasing Where xxx ON or OFF This command configures the modem for the RTS control mode If ON is selected the TX IF output will only be turned on if the incoming RTS signal is asserted also the TX IF output has to be programmed ON and no major modulator faults are present If OFF is selected the TX IF output will operate normal ignoring the RTS signal Where AMI HDB3 B6ZS or B8ZS Where xxxx AMI HDB3 B6ZS or B8ZS Where xxx TX1 TX2 RX1 or RX2 service channel designator nnn 6 to 8 in steps of 2 service channel level in dB Where xxxxx T1 T1ESF E1CCS E1CAS Where xxxxx T1 T1ESF E1CCS or E1CAS SLM 7650 Satellite Modem
24. 2 ALARMS ALARMS MONITOR STORED 2047 ERRORS FAULTS ALARMS CLEAR FRAME BER Key 4 55 OR Parameter N 4 SUBMENU DEPEN DENT J Information Figure 3 3 Main Menu 3 4 SLM 7650 Satellite Modem Revision 4 Operation 3 2 2 MN SLM7650 IOM Notes 1 Operating mode selections and hardware configuration may change the front panel menu selection 2 Parameters that are specific to certain modem configurations are only accessible after selecting the appropriate modem configuration This prevents incompatible parameters from accidentally being selected 3 Allofthe parameters are accessible in the Custom mode Take caution not to select incompatible parameters as the modem does not block out incompatible command choices in the Custom mode Configuration To view or change the modem s configuration enter the Configuration level from the Function Select menu Once in the Configuration menu press or to scroll through the Configuration menu selection Modulator Demodulator Interface Local AUPC Save Recall Press ENTER to select the desired Configuration menu option To view the options for the selected configuration parameters press lt or To change a configuration parameter press ENTER to begin the change process Press an arrow key to change the parameters When the correct parameters are displayed press ENTER to execute the c
25. General fault status and alarm information 15 indicated by 8 LEDs located on the modem s front panel The TX and RX fault LEDs are dual purpose A lit red LED indicates a fault currently exists in the modem A lit yellow fault LED indicates an alarm currently exists in the modem The Fault LED will turn OFF when the fault and alarm clears All faults and alarms are logged in the stored fault memory and are indicated by the yellow Stored Fault LED A total of 10 fault or alarm status changes will be stored 1n the Stored Faults menu Each fault alarm or stored fault alarm indicated by a front panel LED could be one of many faults Use the Fault or Stored Fault front panel menu to determine which fault or alarm has occurred Alarms will not switch the modem offline in a redundant system Alarms are shown in the Fault or Stored Fault front panel menu by a reversed contrast that appears at the display panel white on black SLM 7650 Satellite Modem Revision 4 Maintenance MN SLM7650 IOM 5 2 9 Fault Alarm Analysis This section describes the possible problems and trouble shooting actions for the each of the faults listed in the Fault Tree Table 5 1 Note Have the modem configuration and fault information available when contacting Comtech EF Data Customer Support if on site troubleshooting efforts fail to determine the problem with the modem 5 2 5 1 Modulator Faults Table 5 2 Modulator Fault Information Fault Alarm
26. On entry the current transmit clock setting is displayed Press an arrow key to make the selection Press ENTER to execute the change TX CLOCK PHASE Programs the TX clock phase to Normal or Invert On entry the current setting of the TX clock phase is displayed Press T or to make the selection Press ENTER to execute the change SCT PLL REF Programs the timing source for the Serial Clock Transmit SCT Phase Lock Loop PLL MODEM REF Source Uses the timing standard that is programmed in the Modem Reference menu EXT MASTER CLOCK The MC input is on the baseband data interface The frequency must be programmed in the Ext Master Clock Frequency menu screen DATA SOURCE SYNC appears only when DATA is selected as the Tx Clock source RX Loop appears only when Loop Timing is ON De selecting DATA or Rx Loop is accomplished at the CONFIG INTERFACE MENU On entry the current timing source is displayed Press 1 or 4 to make the selection Press ENTER to execute the change 3 12 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM Specifications usage EXT MASTER CLOCK FREQUENCY Programs the external master clock input frequency between 9 6 kHz and 20 MHz The data rate of the external master clock input will need to be entered by the user to match the expected rate at the input to the modem at the data I O connector Notes 1 If the EXT MC is selected as the timing so
27. RAW BER Displays the current BER or No Data if carrier is not locked Range lt m m E e to gt m m E e Note Low limit is based on performance High limit is based on data code rate CORRECTED BER Displays the current corrected BER or No Data if carrier is not locked Range lt m m E e to gt m m E e Note Low limit is based on performance High limit is 1 0 E 12 Eb No Displays the current E No or No Data if carrier is not locked Range mm m to mm m Note Low limit is based on the data rate High limit is 16 0 dB RECEIVE SIGNAL Displays the current receive signal level Range 15 0 to 55 0 dBm SWEEP FREQUENCY Displays the current sweep frequency offset from the configured demodulator center frequency Range 35 000 to 35 000 Hz BUFFER FILL Displays the current plesiochronous buffer fill status percent Range nn 196 to 99 Note Press ENTER twice to reenter the buffer 2047 ERRORS Displays the 2047 data pattern error rate or No Data if the 2047 data pattern is not detected Range nun E e to nun E e Note Low limit is based on performance High limit is based on the data code rate FRAME BER Displays the IDS IBR frame error rate in the same format as 2047 errors 3 20 SLM 7650 Satellite Modem Revision 4 Operation 3 4 3 MN SLM7650 IOM Faults Alarms Menu The Faults Alarms level is accessible from the Function Select menu The Faults Alarms are similar to mo
28. command P13 n where n is 0 1 2 0 NRM 1 INV 2 AUTO Parameter 14 Transmit data phase ref command P14 n where n is 0 1 0 1 INV Parameter 15 Transmit BPSK Data Ordering ref TDA command P15 n where n is 0 1 0 1 INV Parameter 16 Carrier Only Mode ref command P16 n where n is 0 OFF T CENTER CW 2 DUAL CW or 3 OFFSET CW Parameter 17 RTS TX IF Control Mode ref RTSM P17 n where is O or 1 0 OFF 1 ON Parameter 18 Interface substitution pattern ref ISP P18 n where n is 0 to 2 O OFF 1 2047 ON 2 MIL188 p 19 Transmit data fault ref TDF P19 n where n is 0 1 to 2 O NONE 1 DATA 2 AlS hc 20 Modulator Power Offset ref MPO command P20 snn n transmitter output power offset in dBm Parameter 21 Scrambler Type ref SCRT_ command P21 n where 0 IESS 1 73 or 2 TURBO er 22 SCT PLL Reference ref MSPR_ command P22 n where n is 0 or 1 O MR 1 ERF 23 ASYNC TX Baud Rate ref TOBR_ command P23 n where n is 0 110 baud T 150 baud 2 300 baud 3 600 baud 4 1200 baud 5 2400 baud 6 4800 77 9600 baud 8 19200 baud 9 38400 baud Parameter 24 ASYNC TX
29. 1 64Kbit s ref Data Note 6 117 Terrestrial ASYNC Source p117 7 n where n is 0 J2 or 1 J6 ref TAS command Note 9 118 DDO IDI Loopback p118 n where n is 0 OFF or 1 ON ref command Notes 1 Data will only be returned if TX Overhead is programmed for ASYNC Comma is always returned 2 Data will only be returned if RX Overhead is programmed for ASYNC Comma is always returned 3 Data will only be returned if the option card is installed and the TX Overhead is programmed for DI Comma is always returned 4 Data will only be returned if the option card is installed and the RX Overhead is programmed for DI Comma is always returned 5 Data will only be returned if the option card is installed and the TX Overhead is programmed for IDR Comma is always returned 6 Data will only be returned if the option card is installed and the RX Overhead is programmed for IDR Comma is always returned 7 Data will only be returned if the option card is installed Comma is always returned 8 Data will only be returned if the option card is installed and either TX or RX Overhead is programmed for ASYNC Comma is always returned 9 Data will only be returned if the option card is installed and TX or RX Overhead is programmed for DI Comma is always returned 43 SLM 7650 Satellite Modem Remote Control Specifications Bulk Command lt add BCSF_ cr Consoli Respo
30. 1 to 15 and 17 to 31 Channels 1 to N N Satellite Data Rate 64 kbps Note 30 1920 0 kbps is a transparent mode which disables time slot to channel mapping Drop Channel Assignments Maps terrestrial time slots to transmit satellite channels Insert Channel Assignments Maps received satellite channels to terrestrial time slots Terrestrial Data Interface G 703 Signals Supported DDI Drop Data Input DDO Drop Data Output IDI Insert Data Input IDO Insert Data Output Note Only DDI and IDO are supported on the G 703 un balanced interface DDO to IDI internal loop is supported when enabled the drop data output is internally routed to the insert data input Transmit Clock Source Transmit clock will reference the terrestrial input data source only Drop Receive Buffer Clock In addition to the normal buffer clock sources Insert Clock is added Source Insert as a selection If Insert is selected as the clock source inserts will be applied to the terrestrial data input at IDI and output to IDO Any other clock selection will cause inserts to be applied to an internally generated terrestrial data stream referenced to the selected clock source and output to IDO D amp I operates with the IBS Overhead ESC 4 23 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 4 3 3 4 4 3 3 1 4 4 3 3 2 Reference and Clock Distribution Modem Frequency Reference A modem freq
31. 25 SLM 7650 Satellite Modem Remote Control Specifications A 14 Command Response Demodulato r Config Status add DCS cr 2add DCS DF nn nnnnnnn cr DR nnnn mmmmm mmm cr ADRA nnnn mmmmm mmm cr ADRB nnnn mmmmm mmm cr ADRC nnnn mmmmm mmm cr ADRD nnnn mmmmm mmm cr ADRV nnnn mmmmm mmm cr DE DDEC SCF snnnnn cr SWR nnnnn cr SR BERT DT xxxx cr DDT xxx cr DSR RSDE RDA xxx cr DCRT xxxx cr R310 xxx cr DRSC nnn _ Note 1 A 26 Revision 4 MN SLM7650 IOM Demodulator Configuration Status Demodulator Frequency Demodulator Rate Preset A Assignment Preset B Assignment Preset C Assignment Preset D Assignment Preset V Assignment Descrambler Enable Differential Decoder IF Loopback Sweep Center Frequency oweep Width Range Sweep Reacquisition BER Threshold Demodulator Type Demodulator Decoder Type Demodulator Spectrum Rotation Reed Solomon Decoder Receive BPSK Data Ordering Descrambler Type RX 8PSK IESS 310 Operation Reed Solomon Codeword The demodulator configuration status command causes a block of data to be returned by the addressed modem The block of data reflects the current configuration of the demod Additional configuration status of new options and features will always be appended to the end Notes 1 Data is only returned when the modem type is
32. Bit 1 RX backward alarm 3 Bit 0 RX backward alarm 4 Change Command lt add CS_ cr Where Status Response gt 5 The x character is defined as follows no change since last BCS_ and BCSF polls A BCS response has changed since last BCS poll BCSF response has changed since last BCSF _ poll C Both responses have changed since last BCS and BCSF polls This command indicates that a change has or has not occurred on either the BCS_ or the BCSF response since the last BCS_ or BCSF poll A 46 SLM 7650 Satellite Modem Remote Control Specifications A 19 Equipment Type Boot M amp C Firmware Information Host M amp C Firmware Information Data Bulk Firmware Information Modem Options Misc Information Serial Number System Information Command Response Command Response Command Response Command Response Command Response Command Response add ET gt add ET_tttttttt_xxx yyy zzz cr lf add BFl add BFl VER xxx yyy zzz cr FW nnnnnn ddr cr mm dd yyyy cr hh mm ss cr If add MCFI VER xxx yyy zzz cr FW nnnnnn ddrr cr mm dd yyyy cr If add DFl FW nnnnnnrr cr mm dd yyyy cr hh mm ss cr If add MOI gt s 8PSK cr s IBS_IDR cr 5 s HRV cr s RS cr 5 16 s
33. FEC Mode 64 kbps data rate End to end delay ms Viterbi Rate 1 2 Reed Solomon 266 Turbo Product Coding Rate 3 4 QPSK OQPSK Turbo Product Coding Rate 21 44 BPSK Turbo Product Coding Rate 5 16 BPSK SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 3 3 5 Uncoded Operation No FEC There are occasions where a user may wish to operate a satellite link with no forward error correction of any kind For this reason the modulator offers this uncoded mode for three modulation types BPSK QPSK and OQPSK However the user should be aware of some of the implications of using this approach PSK demodulators have two inherent undesirable features The first of these is known as phase ambiguity and is due to the fact the demodulator does not have any absolute phase reference and in the process of carrier recovery the demodulator can lock up in any of K phase states where K 2 for BPSK K 4 for QPSK OQPSK Without the ability to resolve these ambiguous states there would be a 1 in 2 chance that the data at the output of the demodulator would be wrong in the case of BPSK For QPSK the probability would be 3 in 4 The problem 15 solved the case of BPSK by differentially encoding data prior to transmission and then performing the inverse decoding process This is a very simple process but has the disadvantage that it doubles the receive BER For every bit error the demodulator produces th
34. IBS Operation The IBS mode of operation configures the modem for basic IBS operation without the addition of the overhead card The IBS mode is used for open network applications operating in compliance with the IESS 309 Intelsat standard When the IBS mode is active an overhead of 6 66796 will be added to the selected data rates The available IBS data rates are n x 64 kbps from 64 kbps to 2 048 Mbps Optional Reed Solomon R S concatenated outer coding compatible with the IESS 308 IDR small carrier standard 1s supported in this mode The R S parameters that are selected for this mode of operation are n 126 k 112 t 7 with an interleaver depth of 4 Operation in this mode requires the IBS framing option to be activated The data type will be MIL 188 RS 422 and there will not be any access to the Intelsat defined ESC overhead data An optional overhead card is required for G 703 or any other baseband interface and to gain access to the ESC overhead data 3 39 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM Table 3 7 IBS Default Parameters Function Configuration Osecmds 0 Fes ecoter Of RX Satelite RXCokPhae Utility EmoderTye Bs o OpmaonMode S 3 40 SLM 7650 Satellite Modem Revision 4 Operation 3 5 5 MN SLM7650 IOM VSAT IBS Operation The VSAT IBS mode of operation configures the modem for open and close
35. IF output must be turned on to get the modem to lock If the modem type is entered as the same configuration the modem will not change any parameters If the modem is changed to custom no parameters will be changed A Use caution when modifying the Custom Mode Type The user has the capability to change all of the modem settings including incompatible parameters It is recommended that qualified personnel use the Custom Mode only as the Custom Mode was designed for special case configurations MODEM OPTIONS Status Only Displays the installed modem options If the option is installed a symbol is displayed To view the available options press ENTER Observe for the flashing cursor Press the directional arrow to move from one symbol to the next The first line will display the option The second line will display the status A symbol indicates the option is installed symbol indicates the option is Not Installed or FAST Upgradeable A 0 symbol indicates the option is Not Installed or Not Upgradeable OPTIONS FULL RATE VAR 8PSK 2 3 amp 5 6 IBS IDR FRAMING ASYNC OVERHEAD REED SOLOMON 16QAM 3 4 amp 7 8 MOD ENABLED DEMOD ENABLED TURBO OPTION G 703 50 PIN OPTION D amp I ESC MODEM SERIAL Status Only Displays the modem serial number CONFIGURATION CODE Comtech EF Data supplied code MODEM SLM 7650 Satellite Modem Revision 4 Operation 3 5 3 5 1 MN SLM7650 IO
36. Note ASYNC Overhead only Where n n 0 5 to 6 0 in 0 5 increments max tracking rate in dBm minute Note ASYNC Overhead only Where xxxx HOLD NOM or MAX power level setting when local carrier loss Note ASYNC Overhead only Where xxxx HOLD NOM or MAX power level setting when remote carrier loss Note ASYNC Overhead only 21 SLM 7650 Satellite Modem Remote Control Specifications Remote Modem AUPC Commands Remote AUPC Enable Remote Interface Substitution Pattern Remote Interface Baseband Loopback Remote Interface Read Error Status Notes Revision 4 51 7650 1 1 Always wait 3 seconds between consecutive remote modem command status polls 2 If Local AUPC is not enabled status commands will return last known condition They will also request status from the remote modem This allows a second request to return proper status Command Response Command Response Status Response Command Response Status Response Command Response Example Command Response add RPC xxx cr 2add RPC xxx cr If add RISP 2add RISP xxx cr If add RISP cr 2add RISP x cr If add RBBL xxx cr add RBBL xxx cr If add RBBL cr add RBBL xxx cr If add RRES gt 5 nE e cr If add RRES add RRES 2E 6 cr If A 22 Where xxx ON or OFF remote AUPC enable Note ASYNC O
37. add RET add RET cr add RET lt add TIF_xxxxx cr gt add TIF_xxxxx cr lf add TIF gt add TIF_xxxxx cr lf add TAS xx cr add TAS xx cr If add TAS gt 5 xx cr If A 18 Revision 4 MN SLM7650 IOM Where ii 1 to n over the satellite insert channel where n demodulator data rate divided by 64 kbit s 1 to 24 terrestrial channel number for T1 data formats 7 1 to 31 terrestrial channel number for E1 data formats cc 0 if no insert is desired for the specified insert channel Notes The status response returns programming information for 1 to n insert channels Time slot 16 16 may not be specified when the insert data format is specified to be E1CAS This command is not valid when the insert data format is specified as E1CAS and the demodulator data rate is set to 1920 0 kbit s Where xxx TX1 TX2 TX3 4 RX1 RX2 RX3 or RX4 backward alarm designator nnn ON or OFF Where xxxxx DATA 64K Data or AUDIO 2x32K Audio Note TX IDR Overhead only Where xxxxx DATA 64K Data or AUDIO 2x32K Audio Note RX IDR Overhead only Where xxxxx J1 RS422 J6 5422 G703B Balanced G 703 G703U Unbalanced G 703 Where xx J2 or J6 SLM 7650 Satellite Modem Remote Control Specifications A 10 1 ASYNC Transmit Overhead Baud Rate ASYNC Receive Overhe
38. p5 mmmmm mmm code rate data rate in kbit s nnnn mmmmm mmm code rate data rate in kbit s p7 mmmmm mmm code rate data rate in kbit s p8 nnnn mmmmm mmm code rate data rate in kbit s p9 snn n transmitter power offset level in dBm p10 snn n transmitter output power level in dBm p11 n where is 0 off or 1 on p12 n where n is 0 off or 1 on p13 n where n is 0 EFD or 1 INTL p14 n where is 1 Viterbi or 2 TURBO p15 n where n is 0 Normal 1 Center 2 Dual or 3 Offset p16 nn nnnnnn demodulator IF frequency in MHz SLM 7650 Satellite Modem Revision 4 Remote Control Specifications MN SLM7650 IOM Bulk Consol Status continued Parameter Parameter Name Number Command Reference Description 17 Demodulator rate p17 nnnn mmmmm mmnm code rate data rate in kbit s ref command 18 Demodulator preset A assignment p18 nnnn mmmmm mmm code rate data rate in kbit s ref ADRA command 19 Demodulator preset B assignment p19 nnnn mmmmm mmm code rate data rate in kbit s ref ADRB command 20 Demodulator preset C assignment p20 nnnn mmmmm mmm code rate data rate in kbit s ref ADRC command 21 Demodulator preset D assignment p21 nnnn mmmmm mmm code rate data rate in kbit s ref ADRD command 22 Demodulator preset V assignment p22 mmmmm mmm code rate
39. very useful coding gain Higher coding gain possible with other methods Almost universally used with de facto standards for constraint length and coding polynomials Shortest decoding delay 100 bits of any FEC scheme good for coded voice VOIP etc Short constraint length produce small error bursts good for coded voice No pronounced threshold effect fails gracefully Coding gain independent of data rate Reed Solomon Reed Solomon 15 an added coding method to convolutional encoding and Viterbi decoding This 15 called Concatenated Code when more than one error correction methods 15 used at the same time The concatenation of an outer Reed Solomon Codec with Viterbi decoder first became popular when it was introduced by Intelsat in the early 1990 s It permits significant improvements in error performance without significant bandwidth expansion The coding overhead added by the RS outer Codec 15 typically around 10 which translates to a 0 4 dB power penalty for a given link Reed Solomon codes are block codes as opposed to Viterbi which is convolutional and in order to be processed correctly the data must be framed and de framed Additionally Reed Solomon codes are limited in how well they can correct errors that occur in bursts This unfortunately is the nature of the uncorrected errors from the Viterbi decoder which produce clusters of errors that are multiples of half the constraint length For this r
40. Backward Alarm Enable RX3 Backward Alarm Enable 4 Terrestrial Interface Format ASYNC Transmit Overhead Baud Rate ASYNC Transmit Channel Character Length ASYNC Transmit Channel Stop Bits ASYNC Transmit Channel Parity ASYNC Communications Type ASYNC Receive Overhead Baud Rate ASYNC Receive Channel Character Length ASYNC Receive Channel Stop Bits ASYNC Receive Channel Parity AUPC Local Power Enable AUPC Nominal Power Value AUPC Minimum Power Value AUPC Maximum Power Value AUPC Local Carrier Loss AUPC Remote Carrier Loss AUPC EBNO Target Set Point SLM 7650 Satellite Modem Revision 4 Remote Control Specifications MN SLM7650 IOM Note 2 AUPC Max Tracking Rate RTSM xxx cr RTS TX IF Control Mode TAS Note 9 Terrestrial ASYNC Source DIL Note 10 DDO IDI Loopback The Interface configuration status command causes a block of data to be returned by the addressed MODEM The block reflects the current configuration of the interface Additional configuration status of new options and features will always be appended to the end Notes Data is only returned for TX ASYNC Overhead Data is only returned for RX ASYNC Overhead Data is only returned for TX or RX ASYNC Overhead Data is only returned when the option card is installed and RX overhead is IDR Data is only returned when the option card is installed and TX overhead is IDR Data is only returned when the option card is insta
41. Input Voltage 90 to 132 or 175 to 264 VAC Unit switches range automatically Connector Type Fuse Protection 2A slo blo Line and neutral fusing 5 mm type fuses SLM 7650 Satellite Modem Rev 3 Installation MN SLM7650 IOM 2 2 2 2 IF Connection Transmit and Receive Table 2 2 IF Interface Connector Name Connector Type Tx IF CP1 TNC 500 optional 50 0 Rx IF TNC 500 optional 50 O 2 2 2 3 External Reference Input Table 2 3 Modem External Reference Input Connector Type REF CP3 TNC 500 optional 50 2 2 2 4 Terrestrial Data Interfaces Table 2 4 Terrestrial Data Interface 37 Pin D Female a SLM 7650 Satellite Modem Installation 2 2 2 5 Rev 3 MN SLM7650 IOM Table 2 5 Terrestrial Data Interface 25 Pin D Female Optional 1 6 8 ____ 8 20 9 4 0 Remote Control Interface M amp C Table 2 6 Remote Control Interface M amp C Remote Control Interface 9 Pin D Female DCE EIA 485 4 Wire EIA 485 2 Wire EIA 232 Pin Signal Name VO Pin 5 uama ae 1 21 34 148 ofa 1o 1o F NEN Lt l3 pt 4 TX RX VO 4 5 EU NUM ETE VO 5 TX RX 2211 0211 8 TX RX _9 TX RX 2 4 SLM 7650 Satellite Modem Rev 3 Installation MN SLM7650 IOM 2 2 2 6 Asynchronous Data Interface Tab
42. It cannot be emphasized strongly enough that the purpose of the concatenated Reed Solomon is to dramatically improve the BER performance of a link under given noise conditions It should NOT be considered as a method to reduce the link EIRP requirement to produce a given BER Factors such as rain fade margin particularly at Ku band are extremely important and reducing link Effective Isotropic Radiated Power EIRP can seriously degrade the availability of such a link Table 4 2 Concatenated RS Coding Summary Exceptionally good BER performance Very pronounced threshold effect does not fail several orders of magnitude gracefully in poor Eb No conditions Additional coding improvement in link BER under given overhead actually degrades sync threshold and reduces link conditions link fade margin Very small additional bandwidth Significant processing delay 25 kbit s not good for expansion voice or IP applications Trellis Coding In the other FEC methods described here the processes of coding and modulation are independent the FEC codec has no knowledge of or interaction with the modulator However there are schemes in which the coding and modulation are combined together where the encoder places FEC symbols in a precise manner into the signal constellation This can yield an overall improvement in performance and is used in higher order modulation schemes such as 8PSK 16 PSK 160AM etc When convolution coding 15 u
43. Transmit Red Yellow A fault red or alarm yellow condition exists in the transmit chain Red Yellow A fault red or alarm yellow condition exists in the receive chain ___ Red common equipment fault condition exists Stored Yellow A fault or alarm has been logged and stored The fault may or may not be active Status Transmitter is currently on This indicator reflects the actual condition of the transmitter as opposed to the programmed condition Flashes when the modem is in a test configuration 3 1 2 Front Panel Keypad The front panel keypad Figure 3 2 controls the local operation of the modem The keypad consists of six keys Each key provides one or more logical functions Table 3 2 The modem responds by beeping whenever a key is pressed e A single beep indicates valid entry and the appropriate action was taken A double beep indicates an invalid entry or a parameter is not available for E A EJ AG 26 aim Figure 3 2 Keypad re SATELLITE U x BEN M 3 2 SLM 7650 Satellite Modem Revision 4 Operation 3 2 3 2 1 MN SLM7650 IOM Table 3 2 Keypad Functions Ky ENTER This key is used to select a displayed function or to execute a modem configuration change CLEAR This key is used to back out of a selection or to cancel a configuration change which has not been executed using EN
44. User Figure 4 4 Modem Clocks Internally 4 27 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 4 3 3 2 4 Timing Configuration 4 Slave Modem Loop Timed Master clock 15 at the distant end of the link TX Clock Source TX Terrestrial Selecting RX satellite turns Off the buffer The user desires to clock the SD to the modem with the satellite clock User configured Loop Timing The TX and RX data rates must be equal The user must tie RT and ST at their equipment Figure 4 5 Internal Clock Reference detect TRANSMIT User uses IF Output ST for TT and SD From decoder Receive RT clocks Buffer RD in Clock Master User Modem Figure 4 5 Slave Timed 4 28 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 4 3 3 2 5 Timing Configuration 5 EXT Master Clock as Source This example illustrates the buffer using the EXT Master clock source Figure 4 6 The External Master clock frequency must be set In the configuration menu Modem Reference clock is either INT 1 5 10 or 20 MHz TX clock Source TX Terrestrial RX Buffer EXT Master Clock The External Master clock inputs on pins 16 and 34 Observe the follows rules If Transmit Terrestrial or External is selected as the buffer outp
45. dd cc BW TX1 nnn cr BW TX2 nnn cr BW nnn cr BW TX4 nnn cr BW RX1 nnn cr BW RX2 nnn cr BW nnn cr BW 4 nnn cr xxxxx cr TOBR nnnnn cr TCCL nnn cr TCSB nnn cr TOCP nnn cr ACT xxxxx cr ROBR RCCL nnnnn cr RCSB nnnnn cr ROCP nnnnn cr LPC NOMP snn n cr MINP snn n cr MAXP snn n cr LCL xxxx cr RCL xxxx cr ENSP nn n cr Note 7 A 29 Revision 4 MN SLM7650 IOM Transmit Clock Source External Reference Frequency Transmit Clock Phase Receive Clock Phase Baseband Loopback Interface Loop Timing Interface Coding Format Transmit Interface Coding Format Receive Buffer Clock Source T1 Frame Structure T2 Frame Structure E1 Frame Structure E2 Frame Structure Interface Buffer Programming Interface Buffer Size Interface Transmit Overhead Type Interface Receive Overhead Type Interface Substitution Pattern TX 2047 Interface Read Error RX 2047 Transmit Data Fault Receive Data Fault Service Channel Level TX1 Service Channel Level TX2 Service Channel Level RX1 Service Channel Level RX2 IDR Transmit ESC Type IDR Receive ESC Type Transmit Data Phase Receive Data Phase Drop Data Format Bulk Drop Channels Assignment Insert Data Format Bulk Insert Channels Assignment Backward Alarm Enable TX1 Backward Alarm Enable TX2 Backward Alarm Enable TX3 Backward Alarm Enable 4 Backward Alarm Enable RX1 Backward Alarm Enable RX2
46. is 0 IDR 1 IBS 2 3 ref SMT_ command CUSTOM 4 DI 7 ASYNC 8 7650 00 9 7650 02 10 IBS 309 or 11 VSAT IBS 60 Modem operation mode p60 n where n is 1 TX ONLY 2 RX_ONLY 3 ref MOM_ command DUPLEX 61 MODEM REMOTE LOCAL mode p61 n where is 0 LOCAL 1 REMOTE 62 Transmit data phase p62 n where is 0 NRM 1 INV ref command 63 Receive data phase p63 n where 15 0 NRM 1 INV ref command Note 3 64 Drop Data Format p64 n where n is 0 T1 1 T1ESF 2 E1CCS or 3 101679 ref command E1CAS Note 4 65 Insert Data Format p65 n where n is 0 T1 1 T1ESF 2 E1CCS or 3 ref IDF_ command E1CAS Note 3 66 Bulk Drop Channels Assignment p66 dd cc dd cc dd cc dd cc as defined by the ref command BDCA command Note 4 67 Bulk Insert Channels Assignment p67 dd cc dd cc dd cc dd cc as defined by the ref BICA command command 68 reserved null field 69 Modem Reference Clock p69 n where n is 4 EXT1 1 EXT5 2 ref command EXT10 or 3 EXT20 respectively 70 Modulator Spectrum Rotation p70 n where is 0 NRM 1 INV ref command 40 SLM 7650 Satellite Modem Remote Control Specifications Revision 4
47. is available This MIL pattern is a modified 2047 pattern that pads the eleven Os in a 2047 pattern to 50 2086 once every five 2047 patterns This creates a 10274 bit test pattern This MIL test pattern must be turned on in the modulator for and BER results to be displayed The receive baseband section contains a configurable FIFO buffer large enough to handle the link variations caused by an inclined orbit geosynchronous satellite Generally the buffer size may be set to 4 ms to take care of the periodic 24 hour link variations of the satellite Refer to paragraph 4 4 3 3 5 for a more complete discussion on the buffer function within the modem Option Interface G 703 Overhead AS 10175 This interface 1s provided as a plug in option card for the SLM7650 with user accessible connectors at the rear of the modem as follows Two BNC type female connectors for 4 703 un balanced interface e One 15 pin D sub female connector for balanced G 703 interface One 50 pin D sub female connector for legacy equipment interfacing The interface provides the following features G 703 data interface balanced un balanced EIA422 MILISS interface 50 pin connector e ASYNC overhead data interface 50 pin connector e Access to IDR IBS Engineering Service Channels ESC e Drop amp Insert Additionally the option card 15 designed to support two build options as follows e Build Option 5 10175 1 G 703 data interface ELA422 MIL
48. or gt to move the flashing cursor and T or V to increment or decrement the digit at the flashing cursor Press ENTER to execute the change RX IF FREQUENCY Programs the demodulator receive frequency between 50 and 90 MHz or 100 to 180 MHz in 1 0 Hz steps On entry the current receive frequency is displayed with the flashing cursor on the first character Press lt or gt to move the flashing cursor and T or 4 to increment or decrement the digit at the flashing cursor Press ENTER to execute the change DESCRAMBLER TYPE Programs the descrambler IESS OM73 or TURBO On entry the current status of the synchronous descrambler is displayed Press an arrow key to make the selection Press ENTER to execute the change DESCRAMBLER Programs the descrambler On or Off On entry the current status of the synchronous descrambler is displayed Press an arrow key to make the selection Press ENTER to execute the change DIFF DECODER Programs the differential decoder on or off On entry the current status of the differential decoder is displayed Press an arrow key to make the selection Press ENTER to execute the change IF LOOP BACK Programs the modem for IF loopback operation When IF loopback is turned on the demodulator input is connected to the Test Mode Configuration modulator output through an internal attenuator The demodulator is programmed to the same frequency as the modulator An attenuator within
49. ref command RS485 2WIRE Note 1 93 AUPC Local Power Enable p93 n where n is 0 off 1 on ref command Note 1 94 AUPC Nominal Power Value p94 snn n where snn n Nominal Power Value in dBm ref command Note 1 95 AUPC Minimum Power Value p95 snn n where snn n Minimum Power Value in dBm ref MINP_ command Note 1 96 AUPC Maximum Power Value p96 snn n where snn n Maximum Power Value in dBm ref command Note 2 97 Target Set Point p97 nn n where nn n EBN0 Target Set Point in dB ref ENSP_ command Note 2 98 AUPC Max Tracking Rate p98 n n where Max Tracking Rate dB Min ref command Note 1 99 AUPC Local Carrier Loss p99 n where is 0 HOLD 1 NOMINAL or 2 ref LCL_ command MAXIMUM Note 1 100 AUPC Remote Carrier Loss 100 n where is 0 HOLD 1 NOMINAL 2 ref RCL command MAXIMUM Note 7 101 Terrestrial Interface Format p101 n where is 0 Balanced G 703 1 UnBalanced ref TIF_ command G 703 2 5 422 J1 or 3 RS 422 J6 102 reserved null field 103 reserved null field 104 reserved null field 105 reserved null field 106 Transmit IESS 310 Mode p106 n where n is 0 off 1 on ref T310 command SLM 7650 Satellite Modem Remote Control Specifications Revision 4 MN SLM7650 IOM Bulk Con
50. 188 interface ASYNC overhead data interface Build Option 2 5 10175 2 Includes all features of build option with the addition of Drop amp Insert overhead and access to IDR IBS ESC 4 18 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 4 3 2 1 1 4 4 3 2 1 2 4 4 3 2 1 3 The option interface card when installed is integrated into the SLM7650 Monitor amp Control system with access to configuration and status monitoring Details of the option interface are included in the following sections Terrestrial Data Interface Selection When the option interface card is installed terrestrial data interfacing 15 selectable as defined in the following Table Selected Interface Interface Connector s EIA422 Modem 25 37 pin Standard modem interface EIA422 Option Card Provided by option card G 703 Balanced 15 pin 50 pin Provided by option card G 703 Un balanced BNC Provided by option card Terrestrial Data Interface MIL STD 188 114A EIA 422 50 pin The MIL STD 188 114A EIA 422 RS422 option card interface 15 provided on a 50 pin connector See 50 pin connector pin out for circuit definitions G 703 Data Interface The G 703 data interface 15 compatible with the requirements set forth within CCITT Recommendation G 703 Specific definitions for the G 703 interface implementation are summarized in the following table Characteristic Definitions Data Rates 1544 0 kbps T1 2048 0 kbps E
51. 2 3 rans mie 65 edere tor De ot 5 10 5 2194 Receive Interlace s wt a Sua u 5 12 3 25 Equipment TAUS 5 13 SLM 7650 Satellite Modem Revision 4 Preface MN SLM7650 IOM 5 3 Modem Performance Verification Tests 5 14 45523 ulio TS u u 5 15 3 31 Spectral Shape IODO uoo aet aote s tee a uas Ee Eg o iip 5 15 RN raa NI NN ten 5 15 5 3 1 3 Spurious using a Spectrum Analyzer 5 16 2 d ias 5 16 2 O UR 5 16 22222 Demod kor yu uma T T 5 18 552 Dynami e RANGE s pumas shaku saam e 5 18 3 9 2027 ACON RIN eoe 5 18 9 09 37 _ ___ 5 18 5 94 ER 5 19
52. DR mmmm mmm code rate data rate in Kbps Parameter 5 Reed Solomon Decoder Enable ref RSDE command P5 n where n is 0 OFF 1 or 2 CORR OFF Parameter 6 Interface receive overhead type ref command P6 n where n is 0 1 IDR 2 IBS 3 DI 4 5 185309 6 VSAT IBS Parameter 7 Demodulator type ref command P7 n where n is 0 1 0 EFD 1 INTL Parameter 8 Descrambler enable ref DE_ command P8 n where n is 0 to indicate off or 1 to indicate on Parameter 9 Differential decoder enable ref _ command P9 n where n is 0 to indicate off or 1 to indicate on Parameter 10 Demodulator Spectrum Rotation ref DSR_ command P10 n where is 0 1 0 NRM 1 INV Parameter 11 RX IESS 310 Operation ref R310 command P11 where is 0 1 0 OFF 1 ON Parameter 12 Buffer Clock Source ref command P12 n where 0 internal clock 1 External Ref 2 TX Terrestrial 3 RX satellite clock or 5 INS 11 SLM 7650 Satellite Modem Revision 4 Remote Control Specifications MN SLM7650 IOM Parameter 13 Receive clock phase ref RCP_ command P13 n where n is 0 or 1 0 NRM or 1 INV Parameter 14 Receive data phase ref command P14 n where n is 0 1 0
53. FLASH ID Not Available 10 Mot Available FLASH Device ID Available Capture Upload Process USB Devices Found 14 Jan 2003 2 Figure 5 1 Reflash Program Window SLM 7650 Satellite Modem Revision 4 Maintenance MN SLM7650 IOM The program and upgrade files should be in one directory An example of what would be contained on an upgrade CD ROM 15 show in figures Figure 5 2 through Figure 5 4 ww S5LM7650 US6 Reflash old Modem Firmware File Edit View Favorites Tools Help 711 CCC File 12 13 2002 6 56 ModemBook 13KB CCC File 4110 2002 12 30 2 objectis 723 Computer 87 C 5LM7650 USB_Reflash le Edit View Favorites Tools Help _ISREG32 DLL USB Reflash exe __ Gold Modem Firmware e Eusbref bin amp fusb reflash hlp Setup DelsL1 isu USB_Rui INI DEISREG ISR Reflash Procedure txt 11 objectis 4 86 ME My Computer Favorites Tools Help 5 7650 Demodulator inf vLM 7650 Modulator inf 4 objectis 59 2 Computer Figure 5 4 Example of USB Drivers File Location SLM 7650 Satellite Modem Revision 4 Maintenance 5 2 5 2 1 5 2 2 5 2 3 MN SLM7650 IOM Fault Isolation The fault monitoring and internal test modes of the modem assists the operator in determining if the link problem 15 the result of a faulty modem Th
54. MM DD YYY Y cr CD SYN ICH BERT lt add ITSF_ cr gt add ITSF_ hh mm ss MM DD YYYY cr MOD TXD TXCPLL_xxx cr PLL_xxx cr xxx cr DRP xxx cr If 49 Module OK FLT IF Synthesizer OK FLT Data Clock Synthesizer OK FLT I Channel OK FLT Q Channel OK FLT AGC Level OK FLT Demod Module OK FLT Carrier Detect OK FLT IF Synthesizer Lock OK FLT I Channel OK FLT Q Channel OK FLT BER Threshold OK FLT Module OK FLT Transmit Data AIS OK FLT Selected Transmit Clock Activity OK FLT Transmit Clock PLL Fault OK FLT SCT Synthesizer PLL Lock OK FLT SCT Reference Clock Activity OK FLT D amp l Drop OK FLT SLM 7650 Satellite Modem Remote Control Specifications Interface Receive Side Stored Faults Common Equipment Stored Faults Interface Backward Alarms Stored Faults Response Command Response Command Response Command lt add IRSF_ cr gt add IRSF_ hh mm ss MM DD YYYY cr MOD DMUX 2047 OVFL UNFL xxx cr BUFF xxx cr INS xxx cr BWA xxx cr FBER add CSF gt add CSF_ hh mm ss MM DD YYY Y cr xxx cr BAT xxx cr 12V xxx cr 12 xxx cr 5 3 3V 2 5V
55. Modem Revision 4 Operation MN SLM7650 IOM SLM 7650 TYPE VER 2 1 3 FUNCTION FUNCTION FUNCTION FUNCTION FUNCTION FUNCTION SELECT SELECT SELECT SELECT STORED SELECT SELECT CONFIGURATION MONITOR FAULTS ALARMS FAULTS ALARMS REMOTE AUPC UTILITY y gt STORED M CONFIGURATION MONITOR FAULTS ALARMS Siti MAAS UTILITY MODULATOR RAW BER MODULATOR ODULATO MODULATOR MODULATOR CONFIGURATION CONFIGURATION MONITOR FAULTS ALARMS 4 0 REMOTE AUPC UTILITY DEMODULATOR CORRECTED BER 1 DEMODULATOR MONITOR _ DEMODULATOR 4 N 2 2 4 N CONFIGURATION MONITOR FAULTS ALARMS 0 UTILITY TX INTERFACE INTERFACE TXINTERFACE y BN N CONFIGURATION MONITOR FAULTS ALARMS STORED UTILITY LOCAL SIGNAL RX INTERFACE ie SYSTEM AUPC RXINTERFACE N 2 A gt 1 4 M IN ML I vr AVE COMMON FREQUENCY D NN 4 4 N Y ST CONFIGURATION MONITOR FAULTS ALARMS FAULTS ALARMS RECALL BUFFER FILL BACKWARD BACKWARD
56. Reference Clock Modulator Spectrum Rotation Reed Solomon Encoder SCT PLL Reference Transmit BPSK Data Ordering Scrambler Type TX 8PSK IESS 310 Operation Reed Solomon Codeword The modulator configuration status command causes a block of data to be returned by the addressed modem The block of data reflects the current configuration status of the modulator module Additional configuration status of new options and features will always be appended to the end Notes 1 Data is only returned when the modem type is set to CUSTOM and TX Overhead is either NONE or ASYNC SLM 7650 Satellite Modem Remote Control Specifications Modulator Coder Config Program Status Command Response gt add MCP_ cr SMT MET xxx cr ITOT xxxxx cr MOM xxxxx cr nn nnnnnn cr MR mmmmm mmm cr MPO snn n cr LPC MOP SE DENC xxx cr nnnnnn n cr TC xxxxx cr ISP ISCL TX1 nnn cr ISCL TX2 nnn cr DDF BDCA dd cc dd cc cr DIL MSR RSEN BW TX1 nnn cr BW TX2 nnn cr BW nnn cr BW 4 nnn cr MSPR TAS TOBR nnnnn cr TCCL nnn
57. Remote Control Specifications DDO IDI Loopback Drop Channels Assignment Bulk Drop Channels Assignment Insert Channels Assignment Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response add DIL xxx cr add DIL add DIL add DIL xxx cr If add DCA dd cc cr add DCA dd cc cr If add DCA add DCA dd cc cr If add BDCA dd cc dd cc dd cc cr add BDCA dd cc dd cc dd cc cr If add BDCA add BDCA dd cc dd cc dd cc cr If add ICA ii cc cr 2add ICA ii cc cr If add ICA ii cr 2add ICA ii cc cr If 17 Revision 4 MN SLM7650 IOM Where xxx ON or OFF Where dd 1 to n over the satellite drop channel where n modulator data rate divided by 64 kbit s 1 to 24 terrestrial channel number for T1 data formats 7 1 to 31 terrestrial channel number for E1 data formats Notes 1 This command is not valid when the drop data format is specified as E1CAS and the modulator data rate is set to 1920 0 kbit s Where dd 1 to n over the satellite drop channel where n modulator data rate divided by 64 kbit s 1 to 24 terrestrial channel number for T1 data formats 7 1 to 31 terrestrial channel number for E1 data formats Notes 1 The status response returns programming information
58. Revision 4 MN SLM7650 IOM FLT OK Modulator FLT OK Interface Transmit Side FLT OK Interface Receive Side FLT OK Common Equipment FLT OK Backward Alarms FLT OK RF Output ON OFF actual status not configuration Module OK FLT IF Synthesizer OK FLT Data Clock Synthesizer OK FLT Channel OK FLT Q Channel OK FLT AGC Level OK FLT Number of stored faults logged to 10 Demod Module OK FLT Carrier Detect OK FLT IF Synthesizer Lock OK FLT Channel OK FLT Q Channel OK FLT BER Threshold OK FLT Number of stored faults logged 0 to 10 Interface Transmit Module OK FLT Transmit Data AIS OK FLT Selected Transmit Clock Activity OK FLT Transmit Clock PLL Fault OK FLT SCT PLL Lock OK FLT SCT Reference Clock Activity OK FLT D amp I Drop OK FLT Number of Stored Faults Logged 0 to 10 Interface Receive Module OK FLT Buffer Clock PLL Lock OK FLT Selected Buffer Clock Activity OK FLT Receive Data Loss AIS OK FLT Demux Reed Solomon Lock OK FLT 2047 Pattern Lock Detect OK FLT Buffer Overflow OK FLT Buffer Underflow OK FLT Buffer Full OK FLT D amp I Insert OK FLT Receive Backward Alarm OK FLT Frame BER OK FLT Number of stored faults logged 0 to 10 SLM 7650 Satellite Modem Remote Control Specifications Common Equipment Status Interface Alarms Response Backward Alarm Status Command Response Comma
59. SLM7650 IOM Specifications usage B BAND LOOPBACK Programs the modem for baseband loopback operation Baseband loop back will turn around the data and clock to the user at the terrestrial interface of the modem This is a bi directional loop so the data and clock over the satellite is also turned around Refer to Figure 5 10 for a block diagram of baseband loopback operation On entry the current status is displayed Press an arrow key to make the selection Press ENTER to execute the change LOOP TIMING Loop timing ON will phase lock the SCT internal clock to the recovered satellite clock of the decoder This is used at the Slave end of a Satellite link to clock the data in and out of the modem using the clock from the distant end of the link Selecting Loop timing ON will cause the SCT INT to change to SCT Loop and the SCT PLL REF to display RX Loop Turn loop timing OFF to make another choice at the SCT PLL REF menu On entry the current status is displayed Press an arrow key to make the selection Press ENTER to execute the change TX CODING FORMAT Programs the transmitter for AMI B6ZS B8ZS HDB3 coding of the baseband data AMI B6ZS B8ZS 21 HDB3 On entry the current coding format is displayed Press an arrow key to make the selection Press ENTER to execute the change Test Mode Configuration Note This menu is only available when G 703 interface is installed RX CODI
60. Solomon encoding 15 absolutely necessary Phase noise and non linear links will have a detrimental effect on 16 Bit Error Rate The Bit Error Rate of any digital circuit is the number of bit errors divided by the bit rate divided by the total time of the test BE Rate time Example What is the bit error rate when 2 errors occurred in 10 minutes with a data rate of 256 kHz 2 256k 10x60 1 3 x 10 A communications link that 15 free of errors 15 always desired but most links will operate with a certain number of uncorrectable errors over a period of time Forward Error Correction 15 necessary to reduce the errors to an acceptable level The BER performance curves are an important reference for modem performance The slope of the BER curve 15 an indication of the speed at which the BER performance can degrade under link impaired conditions There is a point that the modems will not operate any more This point is referred to as the BER Threshold point Once the BER Threshold point is reached then the modem will lose lock The performance of a modem at or near threshold is dependent on the type of FEC that is in operation The Turbo Product Codec will have the least pronounced threshold effect The modem will stay locked at very low EbNo values where the bit error correction is as low as x 10 Data is of course unusable at that point but the error correction will regain substantial error correction for very
61. When the active decoder Viterbi trellis TPC or uncoded determines that the modem 15 locked the M amp C stops the sweep and begins the de stress process This involves fine tuning the DDS based on the phase error in the Costas loop The de stress process continues as long as the modem 15 locked If the carrier is interrupted the M amp C resumes the sweep process The digital clock loop in conjunction with another DDS performs the clock recovery function The clock loop consists of a phase detector loop filter and DDS all implemented digitally The DDS performs the function of a VCO in an analog implementation but can be easily programmed to the desired center frequency via the M amp C The recovered data and symbol clocks are then used throughout the demodulator The soft decision mapper converts the digital I and Q data to 3 bit soft decision values These values are then fed to the programmable vector rotation circuit providing compatibility with spectrum reversal of the I and Q channels SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM The output of the vector rotation circuit is then sent to the FEC decoder or uncoded data formatter The output of the decoder 15 the final output of the demodulator section The uncoded data formatter 15 used In uncoded operation only and bypasses the decoder entirely Since in uncoded operation there is FEC information to use for determining lock ambiguit
62. a modified 2047 pattern that is used to test the Data Source Sync function of the modem It has the maximum number of consecutive zeros that the modem can handle when recovering the clock from the data transitions On entry the current status is displayed Press an arrow key to make the selection Press ENTER to execute the change 3 14 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM Specificationslusage RX 2047 PATTERN Programs the modem to monitor a test pattern Selections are as follows See the options for TX 2047 Pattern Test Mode Configuration The 2047 Errors menu choice under the Monitor menu will report Bit Error Rate if a 2047 pattern is being received by the demod and this option is set to 2047 On entry the current status is displayed Press an arrow key to select on or off Press ENTER to execute the change SERVICE CHANNEL This configuration function is used to set service channel audio gain at TX 1 TX 2 ADJUST RX 1 or RX 2 On entry press gt to select the desired service channel To adjust the service channel 8 0 to 6 0 dBm press ENTER Press 7 or to adjust the service channel Press ENTER to execute the change Note This window is only available when IDR has been selected for modem type in the Utility menu and option card PL 10175 2 is installed DROP FORMAT This configuration is used to select the desired drop data channel sign
63. as the single command status request refer to the appropriate portions of this document in preceding sections Additional configuration status of new options and features will always be appended to the end SLM 7650 Satellite Modem Remote Control Specifications Where pn is the last parameter returned Parameter Number 1 10 11 12 13 14 15 16 Parameter Name Command Reference Modulator RF output ref command Modulator frequency ref MF_ command Modulator rate ref command Modulator preset A assignment ref command Modulator preset B assignment ref command Modulator preset C assignment ref command Modulator preset D assignment ref command Modulator preset V assignment ref ARMV_ command Modulator power offset ref command Modulator output power level ref command Scrambler enable ref SE_ command Differential encoder enable ref DENC command Modulator type ref command Modulator Encoder Type ref command Carrier only mode Demodulator IF ref command 37 Revision 4 MN SLM7650 IOM Description p1 n where n is off or 1 on p2 nn nnnnnn IF frequency in MHz p3 mmmmm mmm code rate data rate in kbit s p4 mmmmm mmm code rate data rate in kbit s
64. available drop channel by incrementing or decrementing the digit at the flashing cursor Press ENTER to execute the change Note This menu is only available for the D amp I option INSERT CHANNEL Insert Channel Assignments Maps received satellite channels to terrestrial time slots ASSIGNMENTS Terrestrial time slots T1 1 to 24 E1 5 1 to 31 E1 CAS 1 to 15 and 17 to 31 Channels 1 to N N Satellite Data Rate 64 kbps N 30 1920 0 kbps is a transparent mode which disables time slot to channel mapping On entry satellite channel 1 and the current terrestrial time slot are displayed Press 1 or V to select the satellite channel to be programmed Press ENTER to choose the satellite channel to be programmed Press 1 to select the terrestrial time slot for each available satellite channel by incrementing or decrementing the digit at the flashing cursor If a time slot is unused select NI Not Inserted Press ENTER to execute the change Note This menu is only available for the D amp I option DDO INI LOOP Selects Drop Data Output to Insert Data Input Loop This provides an internal path so an external cable connection does not have to be connected Selection is ON or OFF Note This menu is only available for the D amp I option 3 16 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM Specifications usage ASYNC TX Programs the baud rate settings and interface format of ASYNC overhead i
65. can be clocked by a number of sources The internal system clock INT the recovered clock from the satellite Sat the TX terrestrial clock from the modulator Terr or the External Master Clock MC from the Data I O When the receive data is clocked out of the modem using the receive recovered satellite clock RX_ Sat the buffer is not active The receive data 1s being clocked in and out of the buffer with the same clock When the buffer clock selection is anything other than the buffer is active and must be properly configured Also anytime that the receive buffer 15 active in the modem that end of the satellite link 1s considered the source of a master clock In a satellite link with one master clock the operator will typically clock the data in and out of the modem with the transmit clock source Terr If there are two master clocks in the link then the receive buffer must operate as a Plesiochronous Doppler buffer The buffer must be sized to compensate for the Doppler shift plus the additional size required to extend the time between inevitable slips caused by the Plesiochronous timing Plesiochronous operation 15 typical in international Public Switched Telecommunications Telephone Network PSTN The PSTN users will inevitably suffer SYNC losses or periodic pattern slips because of the two master clocks are being used in the network The receive buffer will periodically fill and empty as
66. compatible with TN309 5 of the IESS 309 IBS standard is supported in this mode The R S parameters that are selected for this mode of operation are n 219 201 129 with an interleaver depth of 4 Operation in this mode requires the IBS framing option to be activated The data type will be MIL 188 RS 422 and there will not be any access to the Intelsat defined ESC overhead data An optional overhead card is required for G 703 or any other baseband interface and to gain access to the ESC overhead data 3 43 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM Table 3 9 IBS 309 Default Parameters Function Configuration Osecmds Of PRX Clock Phase Nom 1 SS Utility RX IESS 310 Mode PTXIESS 310Mode or Butter Progam o FOperationMode Duplex j 3 44 SLM 7650 Satellite Modem Revision 4 Operation 3 5 7 MN SLM7650 IOM ASYNC AUPC Operation Asynchronous Overhead ASYNC with AUPC is a closed network application that gives the user the ability to communicate from the hub site to the remote site through the added overhead The user can use the AUPC feature that remotely controls the remote modem s power level according to parameters programmed by the user The user can also remotely monitor and control the remote modem by sending remote commands over the link via the overhead This can be done by a local terminal or Monitor and Control s
67. cr TCSB nnn cr TOCP nnn cr ACT xxxxx cr NOMP snn n cr MINP MAXP LCL xxxx cr RCL xxxx cr RTSM xxx cr TDA COM xxxxxx cr SCRT 1310 nnn i cr xxx cr If Note 3 Note 2 Note 7 Note 7 Note 5 Note 5 Note 5 Note 6 Note 6 Note 6 Note 5 Note 5 Note 5 Note 5 Note 8 Note 1 Note1 Note1 Note1 Note 1 Note 3 Note 3 Note 3 Note 3 Note 3 A 24 Revision 4 MN SLM7650 IOM System Modem Type Reset Mod Rate reserved for Comtech switch Modulator Encoder Type Interface Transmit Overhead Type Modem Operation Mode Modulator Type Modulator Frequency Modulator Rate Modulator Power Offset AUPC Local Power Enable Modulator Output Power Scrambler Enable Differential Encoder External Reference Frequency Transmit Clock Source Transmit Clock Phase Baseband Loopback Interface Loop Timing Terrestrial Interface Format Interface Coding Format Transmit Interface Substitution Pattern TX 2047 Transmit Data Fault IDR Transmit ESC Type Service Channel Level TX1 Service Channel Level TX2 Transmit Data Phase Drop Data Format Bulk Drop Channels Assignment DDO IDI Loopback Modem Reference Clock Modulator Spectrum Rotation Reed Solomon Encoder Backward Alarm Enable TX1 Backward Alarm Enable TX2 Backward Alarm Enable TX3 Backward Alarm Enable 4 SCT PLL Reference Terr
68. data rate in kbit s ref ADRV command 23 Descrambler enable p23 n where is 0 off or 1 on ref command 24 Differential decoder p24 n where n is 0 off or 1 on ref DDEC command 25 reserved null field 26 IF loopback p26 n where is 0 off or 1 on ref IFL_ command 27 Sweep center frequency p27 snnnnn sweep center frequency in Hertz ref SCF command 28 Sweep width range p28 nnnnn sweep range in Hertz ref SWR command 29 Sweep reacquisition p29 nnn reacquisition time in seconds ref command 30 BER threshold p30 xxxx BER threshold ref BERT command 31 Demodulator type p31 n where n is 0 EFD or 1 INTL ref command 32 Demodulator Decoder Type p32 n where n is 1 Viterbi or 2 Turbo ref command 33 Transmit clock source p33 n where n is INT 2 EXT 6 DATA ref command 34 External reference frequency p34 nnnnnn n external reference frequency in kHz ref command A 38 SLM 7650 Satellite Modem Remote Control Specifications Bulk Consol Status continued Parameter Number 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 Parameter Name Command Reference Transmit clock phase ref command Receive clock phase ref command Baseban
69. demodulator lock On entry the current status of the remote carrier loss is displayed Press an arrow key to make the selection Press ENTER to execute the change 3 18 SLM 7650 Satellite Modem Revision 4 Operation 3 4 1 5 3 4 1 6 MN SLM7650 IOM Save Menu The Configuration Save menu allows the user to program configuration parameters into memory on the M amp C There are five memory locations that may be used to store specific configuration setups that are used frequently This feature speeds up the configuration process by allowing faster configuration changes After changing the configuration parameters to the desired settings enter the Configuration Save menu and select memory location through 5 Press ENTER to execute the save A hard reset of the modem will clear out the saved parameters Recall Menu The Configuration Recall menu allows the user to recall a previously saved configuration setup On entry select memory location 1 through 5 by pressing an arrow key Press ENTER to execute the recall 3 19 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM 3 4 2 Monitor Menu The Monitor level is accessible from the Function Select menu The Monitor menu provides information on the link performance of the demodulator When the Monitor level is entered press lt or gt to select the desired monitor function Each monitor function is displayed in real time as long as it 15 selected
70. for 1 to n drop channels 2 This command is not valid when the drop data format is specified as E1CAS and the modulator data rate is set to 1920 0 kbit s Where ii 1 to n over the satellite insert channel where n demodulator data rate divided by 64 kbit s 1 to 24 terrestrial channel number for T1 data formats 7 1 to 31 terrestrial channel number for E1 data formats cc 0 if no insert is desired for the specified insert channel Notes 1 This command is not valid when the insert data format is specified as E1CAS and the demodulator data rate is set to 1920 0 kbit s SLM 7650 Satellite Modem Remote Control Specifications Bulk Insert Channels Assignment IDR Backward Alarm Enable IDR Transmit ESC Type IDR Receive ESC Type Terrestrial Interface Format Terrestrial Async Source Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response add BICA ii cc ii cc il cc gt ii cc ii cc ii cc cr If add BICA cr gt ii cc ii cc ii cc cr If add BW xxx nnn cr 2add BW xxx nnn cr If add BW xxx cr 2add BW xxx nnn cr If add TET xxxxx cr add TET xxxxx cr If add TET cr add TET xxxxx cr If add RET xxxxx cr
71. is for control or last known status TX 2047 PATTERN Programs the remote TX 2047 pattern On or Off On entry the current status of the remote TX 2047 is displayed Press an arrow key to make the selection Press ENTER to execute the change Note This program is for control or last known status 3 4 5 2 Remote AUPC Monitor Specificationslusage 2047 ERRORS Receive 2047 BER This is a monitor point that displays the current distant end RX 2047 BER If no data is available No Data is displayed 3 26 SLM 7650 Satellite Modem Revision 4 Operation 3 4 6 MN SLM7650 IOM Utility Menu The Function Select Utility menu is divided into the following categories Modulator Demodulator Interface System Modem Type Provisions also are made for assigning data and code rates to the modulator and demodulator These are the setting for TX or RX code Rate Type A B C and D Changes in the Utility menu may cause changes in other front panel menus After entering the Utility functions level press lt to select the desired Utility menu and press ENTER The Factory Setup Utility menu is for Comtech EF Data service personnel only Entering this menu without authorization may cause the modem to operate incorrectly 3 27 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM 3 4 6 1 Utility Modulator Menu Menu item Specifications usage ASSIGN TRANSMIT Filter A B C D or V FILTERS Data r
72. locked but the data out will not be correct Comtech EF Data strongly cautions users when using uncoded operation If the acquisition sweep width exceeds one quarter of the symbol rate there is a very high probability that the demodulator will false lock As an example if 64 kbps QPSK uncoded is used the symbol rate will be half of this rate or 32 ksymbols second One quarter of this equals 8 kHz Therefore the absolute maximum acquisition sweep range which should be considered is 8 kHz If there is any frequency uncertainty on the incoming carrier this should be subtracted from the sweep width The problem becomes progressively better with increasing symbol rate SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 3 4 Modulation Types 4 3 4 1 BPSK Binary Phase Shift Keying uses vector analysis of the constellatlon pattern to represent one symbol per phase at either 0 180 degrees The rate 1 2 provides 2 symbol outputs for every input bit The symbol rate 15 two times the data rate for BPSK 1 2 Decoder lock is achieved very quickly 4 3 4 2 QPSK Quaternary Phase Shift Keying differs from BPSK by representing two symbols in of four phase positions 45 135 225 or 315 degrees Uncoded 1 1 1 2 S t 3 4 and 7 8 rates are used for QPSK The symbol rate for QPSK with of 1 2 15 the same as the data rate 7
73. menu screen TX Terrestrial Clocks the data to the user with the customers Tx Terrestrial clock input Insert Drop and Insert applications only Overhead must be installed On entry the current setting of the plesiochronous buffer clock is displayed Press an arrow key to make the selection Press ENTER to execute the change BUFFER SIZE Sets the size of the buffer On entry the current buffer length is displayed Press 1 or to select the desired buffer size The buffer size is displayed in seconds or bits Enter the Interface Utility menu to change the buffer units to seconds or bits If selecting seconds choose from 1 to 48 ms in increments of 1 ms or Bypass If selecting bits choose from 32 to 1 048 576 bits in increments of 16 bits Press ENTER to execute the change Setting the RX buffer to RX Satellite will turn off the buffer Note To have the modem calculate the plesiochronous shift set the buffer units to ms When a specific buffer depth is desired set the buffer units to bits Select bits or ms from the Utility Interface menu BUFFER CENTER This configuration function is used to center the buffer Press ENTER twice to center the buffer RX CLOCK PHASE Programs the RX clock phase to Normal or Inverted On entry the current status of the RX Clock is displayed Press an arrow key to make the selection Press ENTER to execute the change 3 13 SLM 7650 Satellite Modem Revision 4 Operation MN
74. modulator section accepts data and clock from a digital signal source and after appropriate processing modulates the information on an IF carrier The modulator provides the following functions l 5 19 Interface that receives digital signals including data clock frequency reference and control from a digital signal source A function that scrambles the data A differential encoder Forward Error Correction FEC encoding Perform BPSK QPSK OQPSK 8 PSK and 16 QAM modulation An output IF signal Setup control monitoring and upgrade of the modulator Built in Test BIT function that detects fault conditions and allows faults to be isolated to the modulator This includes provision for an IF loopback and a transmit interface test data pattern Definition of Demodulator Functions The demodulator section accepts a signal from an Intermediate Frequency IF carrier demodulate the IF carrier and after appropriate processing outputs the data and clock to the user The demodulator provides the following functions N S ae An input for the IF signal Acquisition functions and a function to demodulate BPSK QPSK OQPSK 8 PSK and 16 QAM carriers Forward Error Correction FEC decoding A differential decoder Descrambles the received data Digital interface to output digital signals including data and associated clock Setup control monitoring and upgrade of the demodula
75. number Config Response 2add SMC mn cr If This command saves the current modem configuration for recall at a later time using the RMC command Up to five different modem configurations can be saved Recall Modem Command add RMC n cr Where n 7 1 2 3 4 or 5 stored configuration number Config Response 2add RMC This command causes the modem to be reprogrammed with configuration parameters previously saved using the SMC command One of five saved configurations can be specified A 20 SLM 7650 Satellite Modem Remote Control Specifications System Reset A 12 Local Enable AUPC Nominal Power Level Power Limit Minimum Power Limit AUPC Eb N0 Target Set Point AUPC Maximum Tracking Rate AUPC Local Carrier Loss Action AUPC Remote Carrier Loss Action Command Response add SYSR xxxx cr 2add SYSR xxxx cr If Revision 4 MN SLM7650 IOM Where xxxx HARD or SOFT Note HARD reset initializes and reprograms all modules to system default configuration values while SOFT reset initializes and reprograms all modules to currently programmed configuration values Automatic Uplink Power Control AUPC Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status R
76. or 1 G704 p46 n where n is 0 1 G704 2 6742 or 4 745 p47 n where is 0 BITS 1 MS 48 buffer size in bits seconds p49 n where n is 0 NONE 1 2 IBS 3 DI 4 ASYNC 5 IBS 309 6 VSAT IBS p50 n where n is 0 NONE 1 2 IBS 3 DI 4 ASYNC 5 IBS 309 6 VSAT IBS p51 n where n is 0 OFF 1 2047 2 MIL188 p52 n where n is 0 OFF 1 2047 2 MIL188 Bulk Consol A 39 SLM 7650 Satellite Modem Revision 4 Remote Control Specifications MN SLM7650 IOM Status continued Parameter Parameter Name Number Command Reference Description 53 Transmit data fault p53 n where is 0 1 DATA or 2 AIS ref TDF_ command 54 Receive data fault p54 n where n is 0 1 DATA or 2 AIS ref command Note 5 55 Interface Service Channel TX1 p55 nnn service channel level in dB ref ISCL_ command Note 5 56 Interface Service Channel TX2 p56 nnn service channel level in dB ref ISCL_ command Note 6 57 Interface Service Channel RX1 p57 nnn service channel level in dB ref ISCL_ command Note 6 58 Interface Service Channel RX2 p58 nnn service channel level in dB ref ISCL_ command 59 System modem type p59 n where n
77. rate 110 to 38400 bps press ENTER Press lt gt to position the cursor over the baud rate parameter Press 1 or to select one of the following baud rates bps 110 150 300 600 1200 2400 4800 9600 19200 38400 Once the desired baud rate is displayed press ENTER to set the baud rate To change the RX ASYNC overhead interface format of the modem is displayed press ENTER Press lt gt to position the cursor over the interface format parameter Press 1 or to scroll through the available interface formats Once the desired format is displayed press ENTER to set the baud rate The number of data bits parity and stop bits is selectable Available formats are 7 data bits Even parity and 1 stop bits 7E1 7 data bits Odd parity and 1 stop bits 701 7 data bits No parity and 1 stop bit 7N1 7 data bits Even parity and 2 stop bits 722 7 data bits Odd parity and 2 stop bits 702 7 data bits No parity and 2 stop bit 7N2 8 data bits Even parity and 1 stop bits 8E1 8 data bits Odd parity and 1 stop bits 801 8 data bits No parity and 1 stop bit 8 1 8 data bits Even parity and 2 stop bits 822 8 data bits Odd parity and 2 stop bits 802 8 data bits or No parity and 2 stop bit 8N2 ASYNC COMM TYPE Programs the ASYNC COMM type as EIA 232 EIA 485 2 Wire or EIA 485 4 wire On entry press an arrow key to make the selection Press ENTER to execute the c
78. sConfie irato VI CDU ron uerbo hem MM 3 8 Moa or N 2000 0 a tS a nena eae mns 3 20 sled Demodulator uuu estan eel 3 21 Sd hier 3 25 S ve eC M 3 26 oo r1 getestet e pM 3 20 SPINA RC ML DM tU 3 2 Se MORNO T ono oett etn ee 3 20 Alis tes ra M Lu i Cd med UE 3 21 5 4 9 1 Modulator T u umma _ _ ____ 6_ 3 22 549 Demodulator 3 22 3 4 9 9 Transmit Iter face terre 3 23 54940 Receive Interface T aulis ssec eve tsi 3 23 24295 Common Eg ipment FATS 2555 vt e ae etus asi 3 24 3 4 3 6 IDR Backward yu u t dta teta odit ca t T 3 24 3224 Stored Faults mun 3 25 SAS Remote u ous gt 3 26 34 Remote C RO a t Rid be ale eden 3 26 Remote A 81508 3 26 24505 TTE 3 27 Modulator uy ay au asan e add eee 3 28 34 6 2 Utility Demodul
79. select TX V and press ENTER twice To change the rate using the variable rate selection press ENTER when TX V is displayed A flashing cursor is displayed on the first character of the coding type on line 1 Press lt or gt to move the flashing cursor and 1 or to increment or decrement the digit at the flashing cursor Press ENTER to execute the change TX IF FREQUENCY Programs the modulator transmit frequency between 50 and 90 or 100 to 180 MHz in 1 0 Hz steps On entry the current transmitter frequency is displayed with the flashing cursor on the first character Press lt or gt to move the flashing cursor and 1 or 4 to increment or decrement the digit at the flashing cursor Press ENTER to execute the change Note When the transmitter frequency is changed the transmitter is automatically turned off to prevent the possible swamping of other channels To turn the transmitter on use the IF Output function TX IF OUTPUT Programs the modulator output On or On entry the current status of the output is displayed Press an arrow key to make the selection Press ENTER to execute the change TX POWER LEVEL Programs the modulator output power level from 5 to 30 dBm for no offset An offset can be added through the Utility menu to remove losses or gains in the system On entry the current transmitter power level is displayed with the flashing cursor on the first character Press 1 or V to inc
80. set to CUSTOM and RX Overhead is either NONE or ASYNC SLM 7650 Satellite Modem Remote Control Specifications Demod Decoder Config Program Status Command Resp onse add DCP cr 2add DCP SMT RDR cr DDT xxx cr MOM _ xxxxxxx cr DT DF_nn nnnnnn cr DR nnnn mmmmm mmm cr DCRT xxxx cr DE DDEC xxx cr SCF snnnnn cr SWR nnnnn cr SR ERF nnnnnn n cr BC xxx cr RCP xxxx cr BBL xxx cr xxx cr xxxxx cr IRE RET xxxxx cr ISCL RX1 nnn cr ISCL RX2 nnn cr RDP xxxx cr IDF xxxxxx cr BICA dd cc dd cc cr DIL xx cr IBS nnnnnn cr DSR RSDE BW 1 nnn cr BW RX2 nnn cr BW nnn cr BW 4 nnn cr TAS ROBR RCCL nnnnn cr nnnnn cr ROCP nnnnn cr ACT xxxxx cr ENSP nn n cr MAXT n n cr RDA xxx cr R310 xxx cr DRSC nnn i cr If Note 6 Note 6 Note 4 Note 4 Note 4 Note 5 Note 5 Note 5 Note 4 Note 4 Note 4 Note 4 Note 7 Note 1 Note 1 Note 1 Note 1 Note 1 Note 2 Note 2 Note 3 27 Revision 4 MN SLM7650 IOM System Modem Type Reset Demod Rate reserved for Comtech switch Demodulator Decoder Type Interface Receive Overhead Type Modem Operation Mode B
81. steps Where x A B C D or V preset designator For CEVD 1 2 QPSK 1 2 3 4 QPSK 3 4 7 8 QPSK 7 8 BP12 BPSK 1 2 OQ12 OQPSK 1 2 OQ34 OQPSK 3 4 and OQP78 OQPSK 7 8 BPSK BPSK 1 1 QPSK QPSK 1 1 OQSK OQPSK 1 1 16Q34 16QAM 3 4 16Q78 16QAM 7 8 For TCM FEC nnnnn 8P23 8PSK 2 3 8P56 8PSK 5 6 For TPC FEC nnnnn B2144 BPSK 21 44 B516 BPSK 5 16 21 44 QPSK 21 44 3 4 QPSK 3 4 7 8 QPSK 7 8 17 18 QPSK 17 18 OQ2144 OQPSK 21 44 OQ34 OQPSK 3 4 and OQ78 OQPSK 7 8 OQ1718 OQPSK 17 18 8P34 8PSK 3 4 8P78 8PSK 7 8 8P1718 8PSK 17 18 16034 16QAM 3 4 16Q78 16 7 8 mmmmm mmm Data rate in KHz Where B D or V preset designator Where For CEVD nnnnn 1 2 QPSK 1 2 3 4 QPSK 3 4 7 8 QPSK 7 8 BP12 BPSK 1 2 OQ12 OQPSK 1 2 OQ34 OQPSK 3 4 and OQP78 OQPSK 7 8 BPSK BPSK 1 1 QPSK QPSK 1 1 OQSK OQPSK 1 1 16Q34 16QAM 3 4 16Q78 16QAM 7 8 For nnnnn 8P23 8PSK 2 3 8 56 BPSK 5 6 For TPC nnnnn B2144 BPSK 21 44 B516 BPSK 5 16 21 44 QPSK 21 44 3 4 QPSK 3 4 7 8 QPSK 7 8 17 18 QPSK 17 18 OQ2144 OQPSK 21 44 OQ34 OQPSK 3 4 and 0078 OQPSK 7 8 001718 OQPSK 17 18 8P34 8PSK 3 4 8P78 BPSK 7 8 8P1718 8PSK 17 18 16034 16QAM 3 4 16078 16QAM 7 8 mmmmm mmm Data rate in kHz SLM 7650 Satellite Modem Remote Control S
82. the message 2 cr Carriage return character for commands e End bracket for responses SLM 7650 Satellite Modem Remote Control Specifications A 8 A 8 1 Modulator Frequency RF Output IF Output Modulator Rate Preset Assignment Modulator Rate Preset Selection Revision 4 MN SLM7650 IOM Configuration Commands Responses Modulator Configuration Commands Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status lt add MF_nnn nnnnnn cr gt add MF_nnn nnnnnn cr OFF cr If add MF gt nnn nnnnnn cr If add RF gt xxx cr If add RF gt xxx cr If lt add AMRx_nnnnn_mmmmm mmm cr gt add AMRx_nnnnn_mmmmm mmm cr lf add AMRx cr 2add AMRx mmmmm mmm cr If add SMRx cr 2add SMRx OFF cr If See MR command 4 Where Frequency in MHz 50 000000 to 90 000000 and 100 000000 to 180 000000 in 1 Hz steps Note When the modulator frequency is programmed the RF output is switched off Where xxx ON or OFF Where x A B C D or V preset designator For CEVD nnnnn 1 2 QPSK 1 2 3 4 QPSK 3 4 7 8 QPSK 7 8 BP12 BPSK 1 2 OQ12 OQPSK 1 2 OQ34 OQPSK 3 4 and OQP78 OQPSK 7 8 BPSK BPSK 1 1 QPSK QPSK 1 1
83. the modem connects the IF Out to the IF In When IF loopback is turned off the demodulator is tuned to the previous frequency and is reconnected to the IF input Refer to Figure 5 9 for a block diagram of IF loopback operation On entry the current status of IF loopback is displayed Press an arrow key to make the selection Press ENTER to execute the change BER THRESHOLD Sets the BER threshold If the BER threshold set is exceeded a receive fault will be indicated by the modem status indicators BER threshold may be set from 1 0 E 3 to 1 0 E 8 or may be disabled by specifying None On entry the current setting of the BER threshold is displayed Press 1 to select the desired setting Press ENTER to execute the change 3 10 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM _______ Specifications usage SWEEP CENTER Programs the sweep center frequency for the directed sweep function The sweep center frequency can be set in the range from 35000 to 35000 Hz On entry the current programmed setting is displayed with a flashing cursor on the first character Press lt or gt to move the flashing cursor Press T or to increment or decrement the digit at the flashing cursor Press ENTER to execute the change When in directed sweep the value from the sweep monitor screen when the modem was last locked should be entered for the sweep center frequency SWEEP RANGE Programs the
84. the received signal changes in frequency The buffer size must be set large enough to avoid an over or under fill An overly large buffer will unnecessarily increase the data delay The buffer size should be large enough to allow the buffer to start at any time as the satellite is moving in the inclined orbit The receive buffer size 1s determined by how many days are desired between the clock slips and the amount of Doppler that must be considered The amount of Doppler shift that will be present in the link will vary based on the particular satellite that 15 in the link Communication satellites in geosynchronous earth orbit GEO appear to float in a repeated figure eight pattern every 24 hours The size of the figure eight is controlled through the use of station keeping propulsion As these the satellites reach the end of their operational life station keeping fuel 15 used up and the satellites will be removed from orbit In a move to extend the useful life of some satellite operators are using an operating technique called inclined orbit This procedure allows the satellite to drift in a north south direction while maintaining a strict east west position However the side affects of this operating mode are increased Doppler shift and required antenna tracking systems on large antennas 4 33 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM As satellite distance decreases the frequency of the signal b
85. this alarm is done in the Configuration Demodulator menu This is an alarm based on the corrected BER reading on the front panel 5 10 SLM 7650 Satellite Modem Revision 4 Maintenance MN SLM7650 IOM 5 2 5 3 Transmit Interface Faults Table 5 4 Transmit Interface Fault Information Fault Alarm Possible Problem and Action MODULE TX Interface section fault Typically indicates that the TX Interface will not program Return the modem for repair TX DATA AIS Data or incoming AIS UTILITY INTERFACE TX DATA FAULT AIS Will indicate a fault condition if the user data is all 1s UTILITY INTERFACE TX DATA FAULT DATA Will indicate a fault condition if the user data is all 1s or all Os This is referred to as a data stable condition data is not transitioning TX CLOCK ACT Activity detector alarm of the selected transmit clock Indicates the selected TX clock is not being detected Check the signal of the selected TX clock source TX CLOCK PLL Indicates TX input clock is out of range SCT PLL Internal ST Clock loop fault Indicates the internal ST clock is not locked to the selected reference Return the modem for repair SCT REFERENCE Activity detector alarm at the input of the selected source for SCT Reference ACTIVITY Indicates the selected clock is not being detected Check the signal of the selected clock TX DROP Indicates that the Drop mux has a fault D amp I only 5 11 SLM 7650 Satellite Modem Maintena
86. to 10 Mbit s For Viterbi codes the convolutional encoder encodes the data at 1 2 rate If the selected code rate is 3 4 then 2 of every 6 symbols are punctured For 3 bits in there are 4 symbols out When TPC is selected the data bypasses the R S encoder and enters the Turbo encoder block This block contains all the necessary functions required for Turbo code operation including scrambling unique word insertion and formatting After the FEC encoder the data 15 sent to a programmable vector rotation circuit This feature provides the user with data communications compatibility for spectrum reversal of the I and Q channels before and after satellite transmission The I and Q channel data then pass through a set of variable rate digital Nyquist filters The two identical digital Nyquist filters are followed by the modulator function Symbol rates up to 10 Msym s can be achieved automatically SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 4 2 The modulated carrier is applied to the IF section for conversion to the correct output frequency The spectral shape will be identical to that of input data streams but double sided about the carrier frequency The IF synthesizer provides the proper frequencies to convert the modulator IF to the desired output frequency in the 70 or 140 MHz range The synthesizer incorporates a Direct Digital Synthesis DDS chip to accommodate 1 Hz steps over the full IF range The f
87. vii SLM 7650 Satellite Modem Preface Tables Operating S Susu Table 1 2 SLM 7650 Options Table 1 3 System Specifications Summary Table 1 4 Viterbi Decoder BER Table 1 5 High Order Modulation Options Table 2 1 Modem Rear Panel Connectors Table 2 2 TEC eese cette Table 2 3 Modem External Reference Input Table 2 4 Terrestrial Data Interface 37 Pin D Female Table 2 5 Terrestrial Data Interface 25 Pin D Female Optional Table 2 6 Remote Control Interface M amp C Table 2 7 Asynchronous Data Interface Table 2 8 Fault Alarm Status Interface Table 2 9 50 Pin Sub D Female Interface Connector Table 2 10 15 Pin Sub D Female G 703 Balanced Table 2 11 750 BNC Connectors G 703 Unbalanced Table 3 1 Front Panel Indicators Table 3 2 Keypad Functions Table 3 3 Data Rate Ranges 2 2 2 0 04040022200 Table 3 4 7650 00 Default Para
88. 0 13 6703 6 DIB G 703 1 IDO_A G 703 O EXC A EIA 422 8 EXCBEIA422 BEIA 422 2 2 2 8 3 Connectors 6 703 Unbalanced Table 2 11 75 2 BNC Connectors G 703 Unbalanced Characteristics Tx Data G 703 Input 75 0 Female Rx Data G 703 Output BNC 75 Q Female SLM 7650 Satellite Modem Rev 3 Installation MN SLM7650 IOM This page is intentionally blank Chapter 3 This chapter describes the front panel operation of the modem including the menus and their explanations and clocking information For information about remote control operation refer to Appendix B 3 1 Front Panel The modem front panel Figure 3 1 enables the user to control modem configuration parameters and display the modem status Hs E an mii 55 Um Figure 3 1 SLM 7650 Front Panel The front panel features include e 24 character 2 line LCD display e 6 button keypad for local control e 8 LEDs to provide overall status at a glance Note functions are accessible at the front panel by scrolling through multilevel menu using the front panel keypad and display SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM 3 1 1 LED Indicators The 8 LEDs on the front panel Indicate general modem summary fault Information and status The indicators are defined as follows in Table 3 1 Table 3 1 Front Panel Indicators
89. 0 to indicate off or 1 to indicate on Modulator output power level ref MOP command P2 snn n transmitter output power level in dBm Modulator IF frequency ref MF P3 nnn nnnnnn IF frequency in MHz Modulator Rate Variable Assign amp Selection ref MR mmmm mmm code rate data rate in Kbps Reed Solomon Encoder Enable ref RSEN P5 n where is 0 to indicate off or 1 to indicate on Interface transmit overhead type ref ITOT_ command P6 n where n is 1 IDR or 2 IBS 3 DI 4 5 IBS309 6 VSAT IBS Modulator type ref command P7 n where is or 1 O EFD 1 INTL Scrambler enable ref SE_ command P8 n where is 0 to indicate off or 1 to indicate on Differential encoder enable ref command P9 n where n is 0 to indicate off or 1 to indicate on SLM 7650 Satellite Modem Revision 4 Remote Control Specifications MN SLM7650 IOM Parameter 10 Modulator Spectrum Rotation ref MSR_ command P10 n where n is 0 1 0 1 INV Parameter 11 TX IESS 310 Operation ref T310 command P11 n where is 0 or 1 0 OFF 1 ON Parameter 12 Transmit clock source ref command P12 n where n is 0 INT 2 EXT 6 DATA Parameter 13 Transmit clock phase ref
90. 0 VAC auto selecting and provides 50 to 90 MHz and 100 to 180 MHz transmit and receive intermediate frequency interfaces The primary baseband interface to the modem 15 MIL STD 188 114 type II and An optional interface card 1s available as a baseband interface for special applications Refer to Figure 4 1 for the system operation Built in Test Hardware provisions are included for built in test This built in test means that the modem is constantly monitored for fault or alarm conditions The fault and alarm status of the modem is reported in the FAULT ALARM menu Summary faults are reported on the front panel LED display The Fault connector on the back of the interface will also reports these summary faults through dry contact closures The fault tree Chapter 5 Table 5 1 in the maintenance section 15 a guide for fault and alarm reporting SLM 7650 Satellite Modem Theory of Operation TX OVER HEAD PROGRAMMABLE OVERHEAD TEST PATTERN INTERFACE RX OVER GENERATOR HEAD HEAD MOD TXR S EIA 422 530 TIMING BYPASS INT_REF ST ST RX_CLK PLL MC OPTIONAL DATA INTERFACE CLOCK RECOVER EXT REF INT_REF NERE CLOCK 1 5 10MHz REF OSC DISTRIBUTION PLL INT REF PROGRAMMABLE TEST PATTERN DETECTOR SERIAL M amp C ALARM INTERFACE FAULT INTERFACE ETHERNET Optional PROCESSOR TX OVER BUFFER PLL RX OVER HEAD BUFFER kx SCRAMBLER R S ENCODER INTERL
91. 1 6312 0 kbps T2 and 8448 0 kbps E2 Line Coding AMI HDB3 B6ZS and B8ZS Balanced Data Interface Supported on the 50 pin and 15 pin connector interfaces Simultaneous connections to both connectors is not supported Un balanced Data Interface Supported on BNC 75 ohm connector interface 4 19 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 4 3 2 1 4 4 4 3 2 1 5 4 4 3 2 1 6 Asynchronous Data Channel 50 pin An asynchronous data interface accessible through the 50 pin connector is provided The asynchronous data interface 1s selectable between the interface at the 50 pin connector or the interface at the modem 9 pin ASYNC data connector Open Collector Fault Outputs 50 pin Open collector outputs for modulator fault MF and demodulator fault DF are provided at the 50 pin connector The open collector outputs source ground to indicate that the associated fault does not exist These fault indicators are used for interface to CEFD redundancy systems AGC Output A programmable DC output proportional to the receive signal level is provided on the 50 pin connector Output Voltage Range 0 to 10 Min power 60 dBm output voltage Programmable from 0 to 10 Vdc in 5 volt increments Default value of 0 Vdc Max power 15 dBm output voltage Programmable from 0 to 10 Vdc in 5 volt increments Default value of 10 Vdc Receive Signal Level Output Indication The output voltage sh
92. 168 108 138 121 108 98 91 84 143 174 113 126 113 104 96 89 155 154 154 184 124 136 29 24 114 106 99 6 Table 5 9 Reed Solomon Overhead Correction Factor Reed Solomon Overhead effect on Eb No 1207112 5 23 SLM 7650 Satellite Modem Revision 4 Maintenance MN SLM7650 IOM This page 15 intentionally blank 5 24 Appendix A REMOTE CONTROL OPERATION This appendix describes the remote control operation of the SLM 7650 Firmware number FW 9875 2B Software version 2 1 3 1 Disclaimer Remote Commands Comtech Data reserves right to make changes remote control commands of the product described in this manual at any time without notice and without obligation to notify any person of such changes If there are any questions regarding your equipment or the information in this manual please contact the Comtech EF Data Customer Support Department NOTE The firmware referenced in this manual may be an earlier version of the actual firmware supplied with the unit A 2 About Remote Commands This document defines the protocol and command structure for remote control and status monitoring of the SLM7650 Satellite Modem Remote controls and status information are transferred via an asynchronous serial communications link Commands and data are transferred on the remote control communications link as US A
93. 2 5 2 Demodulator Faults Table 5 3 Demodulator Fault Information Fault Alarm Possible Problem and Action MODULE Demodulator section fault Typically indicates that the demodulator will not program Return the modem for repair CARRIER DETECT Carrier detect fault Indicates the decoder is not locked This is the most common fault displayed in the modem Any problem from the input data on the modulator end of the circuit to the output of the decoder can cause this alarm First ensure the demodulator has an IF input at the proper frequency and power level Ensure the demodulator data rate is properly programmed Refer to the fault isolation procedure for Data Clock Syn in the modulator section Verify the frequency of the data transmitted from the modulator is within 100 PPM IF SYNTHESIZER Demodulator IF synthesizer fault Indicates the demodulator IF synthesizer is faulted Return the modem for repair CHANNEL Indicates a loss of activity in the channel of the quadrature demodulator Typically indicates a problem in the modulator side of the circuit Check for proper RF input to the demodulator If the input to the demodulator is correct then the problem is in the baseband processing Return the modem for repair Q CHANNEL Indicates a loss of activity in the Q channel of the quadrature demodulator Follow the same procedure for the channel fault BER THRESHOLD Indicates the preset BER threshold has been exceeded Setting of
94. 210010 5 ____________ 4 3 4 3 2 1 Self Synchronizing Scrambler Descrambler EH px 4 3 43 22 Synehronous Scrambler Desctamblet esce p Sensei a ea endl um 4 4 43 Decodiipu o suyana a sanaa ted tdt am are eRe he EE 4 4 Z5 T onvoliilionaliVitorpi e ma hua 4 4 d 001 08 21 uu nta 4 5 0 u uuu a a 4 6 4 3 3 4 Turbo Products Codec Hardware Option en p 4 7 2 5 Operation k aoe D u a 4 9 54 00 Typ uku uyu cee E md eee 4 10 1 3 21 gt RR rene cere c rtt 4 10 4 10 1 3 11 32 Oe OPSE 4 10 29394 SPSE E MU 4 10 293 5 10 EP 4 11 43 52 itbrer aku u MEME MEM 4 11 4 3 0 001 6 5 LE 4 11 Symbol Rate Calculation
95. 422 O CTS BEIM22 0 22 RXC AEIA4228k O RTAEIA422 0 RTAEIM22 0 24 RXC BEIA4226k O RT BElA422 O RT BEIAZZ 0 Audt Aout 64RTA O 422 0 RRAEIA422 0 o oOo Y 30 AudtBou 64RTB O RR BEIA422 0 RReBEIA422 O 32 Aud2Bout 64RDB O DSR BEIA422 0 422 0 422 I 422 1 422 1 422 1 4 TXOdAnEMM22 G6 RXOdAoWElM22 RXDBESCEMMBS _ 4 ews 15 BWAL4 8 ___ lewe 2 BWO3C PRMPLC PROMPTGO SERVCEC 26 BWOZNC 232 0 RCLK ESCEIAZ82 0 8WOSNO PROMPTNO PROMPTNC O sevene SERVCENC is s ed 4 PROMPTNO 4 lewano SERVOENO A SERVCENO 6 Demod Demod Fault NO MN SLM 7650 Satellite Modem Rev 3 Installation MN SLM7650 IOM 2 2 2 8 2 15 Connector 6 703 Balanced Table 2 10 15 Pin Sub D Female G 703 Balanced 15 Pin Sub D Female 6 703 Non D amp l SD 703 DDI A 6 703 SD B 6 703 DDI B 6 703 Pin 703 1 703 1 12 61703 0 5 DDO_B G 703
96. 5 To change the remote address press ENTER Press an arrow key to make the selection Press ENTER to execute the change REMOTE TYPE Select EIA 232 EIA 485 2 wire or EIA 485 4 wire To change the remote type press ENTER Press an arrow key to make the selection Press ENTER to execute the change MODEM REF Programs the Modem Reference timing standard Internal reference External 1 5 10 and 20 MHz Input is REF CP3 on the rear panel On entry the current timing source is displayed Press 1 or to make the selection Press ENTER to execute the change OPERATION MODE Operation mode Programs the modem for Duplex TX only or RX only operation On entry the operational status may be changed Press an arrow key to make the selection Press ENTER to execute the change Note When TX only or RX only are selected the appropriate faults are masked from the Faults and Stored Faults menus TEST MODE STATUS Test mode status indicator The following modem test points are listed in this window and display a when a test mode is active REED SOLOMON CORR OFF B BAND LOOPBACK IF LOOPBACK CARRIER MODE RX 2047 PATTERN TX 2047 PATTERN To view the test modes press ENTER Press an arrow key to make the selection LAMP TEST Lamp test function Press ENTER to turn the front panel indicators on for 3 seconds 3 31 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM Menultem Specificatio
97. 50 IOM Table 1 3 System Specifications Summary continued Characteristic Coding Options Open Network Option w aaa BS Size 19W x 19D x 1 71H inches 1 RU 48W x 48D x 4 3H cm lt 15 Ibs lt 6 8 kg Temperature Operating 0 to 50 C 32 to 122 F Storage Non operational 40 to 70 C 40 to 158 F Humidity 0 to 95 non condensing SLM 7650 Satellite Modem Revision 4 Introduction MN SLM7650 IOM 1 5 1 Bit Error Rate Performance With Noise Refer to the following tables for BER performance over the specified data rate ranges The table values reflect specified guaranteed performance of the demodulator when operating with the associated modulator and noise Typically the performance shall 0 5 dB better than specified for adequate production margin 1 5 1 1 Vfiterbi Decoding BER Performance Table 1 4 Viterbi Decoder BER Eb No Performance Viterbi Decoder QPSK 1 2 3 4 7 8 1 2 3 4 3 4 7 8 SLM 7650 Satellite Modem Revision 4 Introduction MN SLM7650 IOM 1 5 1 2 Viterbi Decoder and Reed Solomon BER Performance Table 1 5 Order Modulation Option Eb No Performance Viterbi Decoder and Reed NorTubo 00 a 18 3 4 0 7 s 100 7 89 10 8 9 3 5 SLM 7650 Satellite Modem Revision 4 Introduction 1 5 2 MN SLM7650 IOM Dimensional Envelope Note
98. 650 02 mode of operation 15 compatible with the 8650 02 operating mode of the SLM 8650 modem up to the 9 3 Mbps data rate limit of the SLM 8650 Operation in this mode requires the ASYNC framing option to be activated Table 3 5 7650 02 Default Parameters Function Configuration Modulator Demodulator TXA 54 kbps QPSK 1 2 TX IF Frequency Output 7 Scrambler Type Scrambler Carrier Mode RS Decoder 0000 Hz RSDeer Interface SCT PLL REF None ff 1 N RX Clock Phase Normal ASYNC TX Baud 1200 Format 7E2 B Band Loopback O ASYNC RX Baud 1200 Format 7E2 Buffer Size 384 bits ASYNC COMM TYPE EIA 232 Local AUPC Hol Hol Function Select Remote AUPC AUPC Enable B Band Loopback Of Utility 2 8 Enable Nominal Power Minimum Power Maximum Power Maximum Power E Modulator Demodulator 54 kbps 1 2 Dec 768 kbps QPSK 1 2 2048 kbps QPSK 1 2 Modulator Power Offset EFD Closed Modulator Type Standard MOD Spectrum TXIESS 310 Mode Interface TX Overhead Type ASYNC Normal RTS CNTRL See 2273 Buffer Program System Operation Mode Dp j 7777 7 71 E 3 36 SLM 7650 Satellite Modem Revision 4 Operation 3 5 3 MN SLM7650 IOM IDR Operation The IDR mode of operation configures the modem for basic IDR operation without the a
99. Character Length ref TCCL_ command P24 n where n is 7 or 8 bits 25 ASYNC TX Stop Bits ref TCSB command P25 n where n is 1 or 2 bits 26 ASYNC TX Parity ref TOCP command P26 n where n is 0 T EVEN 2 ODD Parameter 28 Mod RS Codeword ref MRSC command P28 n where n is 0 RS 225 205 10 depth 8 1 RS 225 205 10 depth 4 2 RS 219 201 9 depth 8 3 RS 219 201 9 depth 4 4 RS 194 178 8 depth 4 5 RS 126 112 7 depth 4 Parameter 29 Interface Coding Format Transmit ref ICFT_ command P29 n where n is 0 AMI 1 8625 2 B8ZS 3 HDB3 SLM 7650 Satellite Modem Revision 4 Remote Control Specifications MN SLM7650 IOM Parameter 30 Interface Service Channel Level TX1 ref ISCL_TX1_ command P30 snn n where snn n is 6 0 to 8 0 in steps of 2 dB Parameter 31 Interface Service Channel Level TX2 ref ISCL_TX2_ command P31 snn n where snn n is 6 0 to 8 0 in steps of 2 dB Parameter 32 Drop Data Format ref DDF command P32 n where n is 0 1 1 TTESF 2 E1CCS 3 E1CAS Parameter 33 Bulk Drop Channel Assignment ref P33 dd cc dd cc dd cc dd cc as defined by the BDCA command Parameter 34 IDR Backward Alarm TX1 ref BW TX1 comman
100. Dimensions are given in both inches and millimeters E ED eC j gt KS 2 OC m E E LIU 450 19 20 483 19 00 we FAULT 3 722 cowmwen eaur uae 9 esr move ae SATELLITE MODEM wranr Powe on GP mE Ad Figure 1 2 Dimensional Envelope Chapter 2 INSTALLATION This chapter provides unpacking and installation instructions system options and a description of external connections The equipment contains parts and assemblies sensitive to damage by Electrostatic Discharge ESD Use ESD precautionary procedures when touching removing or inserting PCBs 2 1 Unpacking The modem and manual are packaged pre formed reusable cardboard carton containing foam spacing for maximum shipping protection Do not use any cutting tool that will extend more than I inch into the c
101. EAVER PROGRAMMABLE OVERHEAD MUX INTELSAT NON INTELSAT DEMAC RX R S BYPASS BUFF REF SEL DESCRAMBLER R S DECODER DE INTERLEAVER PROGRAMMABLE OVERHEAD DE MUX INTELSAT NON INTELSAT DEMAC KEYPAD amp DISPLAY Revision 4 MN SLM7650 IOM UNCODED MAPPER OM73 SCRAMBLER CONV TCM ENCODE TX DE JITTER TX FILTERING TX IF 70 140MHz PRE PROCESSING TURBO CODEC W SCRAMBLER amp DESCRAMBLER amp SYMBOL FORMATTING DECODE OM73 DESCRAMBLER CARRIER SOFT RX IF UNCODED 70 140MHz FORMATTING Q SOFT LOOP amp FILTER Figure 4 1 System Block Diagram 4 2 70 140MHz LOOP BACK 70 140MHz SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 3 Definitions 4 3 1 Differential Encoding Decoding A process of manipulating the data in order to maintain bit integrity There is a possibility that the demodulator may lock to one of the two quadrature positions for QPSK modulation If the demod locks to the wrong quadrature state then the data output will not be correct The use of differential encoding decoding will ensure the data bits will be correct whether the quadrature locks to the wrong state or not 4 3 2 Scrambler Descrambler Scrambling will ensure that there will not be an excessive amount of consecutive 15 and Os in the data stream It is not an encryption method It serves to giv
102. ER Threshold Demodulator Type Demodulator Frequency Demodulator Rate Descrambler Type Descrambler Enable Differential Decoder IF Loopback Sweep Center Frequency Sweep Width Range Sweep Reacquisition External Reference Frequency Buffer Clock Receive Clock Phase Baseband Loopback Interface Loop Timing Terrestrial Interface Format Interface Coding Format Receive Interface Buffer Programming Interface Read Error RX 2047 Receive Data Fault IDR Receive ESC Type Service Channel Level RX1 Service Channel Level RX2 Receive Data Phase Insert Data Format Bulk Insert Channels Assignment DDO IDI Loopback Interface Buffer Size Demodulator Spectrum Rotation Reed Solomon Decoder Backward Alarm Enable RX Backward Alarm Enable RX2 Backward Alarm Enable RX3 Backward Alarm Enable RX4 Terrestrial ASYNC Source ASYNC Receive Overhead Baud Rate ASYNC Receive Channel Character Length ASYNC Receive Channel Stop Bits ASYNC Receive Channel Parity ASYNC Communications Type AUPC EBNO Target Set Point AUPC Max Tracking Rate Receive BPSK Data Ordering RX 8PSK IESS 310 Operation Reed Solomon Codeword This command is used by the EF Data M N protection switch to collect information that is necessary to configure back up modems Because this command content and or order can be changed at any time by EF Data it is advisable that other commands 5 ICS or BCS be used for M amp C systems Notes Data is only ret
103. F ports immi 55 lU 9 9 811111 Figure 1 1 SLM 7650 Satellite Modem SLM 7650 Satellite Modem Revision 4 Introduction 1 2 MN SLM7650 IOM Description The modem is a high performance full duplex digital vector modulator demodulator that meets the requirements of most systems encountered in the commercial and government Satellite Communications industry including e Government Defense e DSCSII e DSCS e Commercial INTELSAT EUTELSAT PANAMSAT NEW SKIES SES Americom Others The modem 15 ideal for tri band terminals requiring both commercial and government access methods Additionally the modem can be used for virtually any closed network satellite communication system The modem is compliant with MIL STD 188 165 over the data rate range specified within this specification The modem 15 also compliant to the INTELSAT Earth Station Standards IESS 308 309 and 310 specifications for the following Intermediate Data Rate e INTELSAT Business Services IBS The modem is compatible with the following modems within the operating parameters defined in this manual OM 73 V MD 1340 MD 1352 P U BEM 7650 SLM 8650 SLM 3650 SLM 6650 SLM 4650 LM 46 4046 MD 945 OM 73 interoperability mode only orderwire not supported SLM 7650 Satellite Modem Revision 4 Introduction 1 2 1 1 2 2 MN SLM7650 IOM Definition of Modulator Functions The
104. Fixed Turbo FEC PL 9652 1 G 703 Option PL 10175 1 G 703 50 pin access to IESS Option Overhead Interface PL 10175 2 ESC Variable Data Rate SLM 7650 Satellite Modem Revision 4 Introduction MN SLM7650 IOM 1 5 System Specifications Summary Table 1 3 System Specifications Summary Characteristic Specification Operating Frequency Range 50 to 90 100 to 180 MHz in 1 Hz steps Modulation Types Non Turbo Modulation Types Turbo Modulation Types BPSK 1 1 and 1 2 CEVD BPSK 5 16 and 21 44 QPSK 1 1 1 2 3 4 and 7 8 CEVD QPSK 3 4 7 8 17 18 and 21 44 OQPSK 1 1 1 2 3 4 and 7 8 CEVD OQPSK 3 4 7 8 17 18 and 21 44 8 PSK 2 3 and 5 6 TCM 8 PSK 3 4 7 8 and 17 18 16 QAM 3 4 7 8 CEVD 16 QAM 3 4 and 7 8 310 operation Built in Test BIT oui and status reporting BER performance monitoring IF loopback programmable test modes Tx Rx 2047 pattern provides and estimated BER Summary Faults Reported via 15 pin D sub FORM C relay contacts for Tx Rx Common equipment faults and Tx and Rx Alarms Spurious 0 to 500 MHz 5 to 30 dBm 5 dBc 0 to 500 MHz 5 tp 20 dBm 50 dBc gt 64 kbps o to 500 MHz 5 to 20 dBm 45 dBc lt 64 kbps Tx Clock Source INT Tx Terrestrial and Data Source Sync Output Connector Demodulation Input Power Desired Carrier 15 to 55 dBm Maximum Composite 0 dBm or 40 dBc SLM 7650 Satellite Modem Revision 4 Introduction MN SLM76
105. IMPORTANT Metric Conversion Metric conversion information is located on the inside back cover of this manual This information 15 provided to assist the operator In cross referencing English to Metric conversions Recommended Standard Designations Recommended Standard RS Designations are equivalent to the Electronic Industries Association EIA Either reference is satisfactory except manuafacturer only will reference one of the designators thru out the manual SLM 7650 Satellite Modem Revision 4 Preface MN SLM7650 IOM Trademarks Product names mentioned this manual may be trademarks or registered trademarks of their respective companies and are hereby acknowledged Reporting Comments or Suggestions Concerning this Manual Comments and suggestions regarding the content and design of this manual will be appreciated To submit comments please contact the Comtech EF Data Customer Support Department European EMC Directive In order to meet the European Electro Magnetic Compatibility EMC Directive EN55022 EN50082 1 properly shielded cables for DATA I O are required More specifically these cables must be shielded from end to end ensuring a continuous ground shield The following information is applicable for the European Low Voltage Directive Type of power cord required for use in the European Community EN60950 CAUTION Double pole Neutral Fusing N ACHTUNG Zweipolige bzw Neutralleiter Sicherung Interna
106. M Modes of Operation The modem has multiple modes of operation that are selectable from any of the control interfaces These modes simplify the configuration of the modem by setting up default values that are consistent with network requirements The modes of operation are selected In the Utility Modem Type menu Paragraph 3 4 6 5 When a mode of operation 15 selected the modem will be configured for a particular set of default operating parameters Certain menus will be displayed blanked or disabled based on the requirements for that particular operating mode The following paragraphs will detail each of the modes of operation and provide a table with the default parameters 7650 00 Operation The 7650 00 mode of operation 15 the basic OM 73 interoperability mode This mode 15 compatible with MIL STD 188 165 Rev and Rev A with some extended capability The additional capability includes 8 PSK and 16 QAM This mode 15 similar to and compatible with the 8650 00 mode in the Comtech EF Data SLM 8650 satellite modem 3 34 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM Table 3 4 7650 00 Default Parameters Function Configuration Osecmds 0 Of RX Satelite PRX Clock Phase Utility TXSS30Mde Jon None OpmaonMode 3 35 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM 3 5 2 7650 02 Operation The 7
107. M Product Address Data Format Baud Rate Comm Type Where abc Explained below Number of data bits 7 b Parity type O E N c Number of stop bits 2 rrrrr baud rate 150 300 600 1200 2400 4800 9600 14 4K 19 2K 38 4 var string1 Variable length strings explaining communication hardware type RS 485 2 wire RS 485 4 wire RS 232 lt var stringx gt Variable length strings explaining the intention of the product Examples Under normal system operation SLM 7650 Satellite Modem Remote Control Specifications A 20 Modulator Stored Faults Demodulato r Stored Faults Interface Transmit Side Stored Faults Stored Faults Revision 4 MN SLM7650 IOM Information on stored faults 15 returned when requested If no stored fault exists for given fault number the words NO FAULT will be returned Instead of the normal time data status The following symbols are commonly used to define the stored faults status commands Command Response Command Response Command Response Fault number 0 to 9 50 1s first fault stored hh Hours in 24 hr format mm Minutes 55 Seconds MM Month DD Day YYYY Year lt add MSF_ cr gt add MSF_ hh mm ss MM DD YYYY cr SYN DCS_xxx cr ICH lt add DSF_ cr gt add DSF_ hh mm ss
108. MN SLM7650 IOM Bulk Consol Status continued Parameter Parameter Name Number Command Reference Description 71 Demodulator Spectrum Rotation p71 n where n is 0 NRM 1 INV ref DSR command 72 Reed Solomon Encoder Enable p72 n where is 0 off or 1 on ref RSEN command 73 Reed Solomon Decoder Enable p73 n where n is O OFF 1 2 CORR OFF ref RSDE command Note 5 74 Backward Alarm enable TX1 p74 n where is O OFF or 1 ON ref BW TX1 command Note 5 75 Backward Alarm enable TX2 p75 n where n is O OFF or 1 ON ref BW TX2 command Note 5 76 Backward Alarm enable TX3 p76 n where n is O OFF or 1 ON ref BW TX3 command Note 5 77 Backward Alarm enable 4 p77 n where n is or 1 ON ref BW TX4 command Note 6 78 Backward Alarm enable RX1 p78 n where n is O OFF or 1 ON ref BW RX1 command Note 6 79 Backward Alarm enable 2 p79 n where n is or 1 ON ref BW RX2 command Note 6 80 Backward Alarm enable RX3 p80 n where n is or 1 ON ref BW RX3 command Note 6 81 Backward Alarm enable RX4 p81 n where n is O OFF or 1 ON ref BW 4 command 82 SCT Reference Clock p82 n where n is 0 MR 1 ERF ref MSPR command Note 1 83 ASYNC TX Overhead Baud Rate p83 nnnnn where nnnnn is the c
109. NG FORMAT Programs the receiver for AMI B6ZS B8ZS or HDB3 coding AMI B6ZS B8ZS or HDB3 On entry the current coding format is displayed Press an arrow key to make the selection Press ENTER to execute the change Note This menu is only available when G 703 interface is installed TX DATA Alarm Transmit data fault Press an arrow key to select one of the following modes None The transmit interface fault Data AIS is not activated Alarm Indication Signal AIS This is also commonly referred to as All Ones The will produce an alarm if the customer 15 inputting data that is all ones Data M amp C will produce an alarm if the Customer input data is missing all zeros or all ones On entry the current TX data fault that is being monitored is displayed Press an arrow key to make the selection Press ENTER to execute the change RX DATA ALARM Receive data Alarm Selects a receive interface alarm monitor of None 5 or Data The data monitored for RX data is coming from the satellite Refer to TX DATA ALARM for a description of function choices On entry the current RX DATA ALARM that is being monitored is displayed Press an arrow key to make the selection Press ENTER to execute the change TX 2047 PATTERN Programs the modem to transmit a test pattern instead of the incoming data stream Selections are as follows Test Mode Configuration NONE 2047 compatible with a Fireberd BERT MIL 188 This is
110. OCK 2 10 MHz Clock Out e RX SATELLITE 20 Mhz DATA SOURCE SYNC Figure 4 8 Internal SCT Clock Selection Notes EXT MASTER CLOCK This choice for SCT PLL REF is a user clock input at the data connector A balanced differential pair may be used to clock the internal clock of the modem Rx SATELLITE This choice is only invoked when Loop Timing 15 turned on This will only appear in the SCT PLL REF menu when loop timing 15 turned on and cannot be changed until loop timing is turned off DATA SOURCE SYNC This will only appear when DATA SOURCE SYNC 15 selected as the transmit clock source The selection cannot be changed until the Transmit Clock Source is changed to either Tx Terrestrial or SCT internal 4 31 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 4 3 3 4 Asymmetrical Loop Timing ASLT There are operational satellite links that have specific clocking requirements that Include the use of unequal data rates for transmit and receive Asymmetrical loop timing ASLT is an optional loop timing mode that will allow for one timing standard in the circuit even though the data rates are not equal Compare the difference in clocking for the following diagrams shown in Figure 4 9 Figure 4 9 Separate Links vs Asymmetrical Loop Timing The top example shows how most users would configure the clock as two separate transmission links if the clock rates are not equal No buffers are required an
111. OQSK OQPSK 1 1 16Q34 16QAM 3 4 16078 16QAM 7 8 For TCM FEC nnnnn 8P23 8PSK 2 3 8P56 8PSK 5 6 For TPC FEC nnnnn B2144 BPSK 21 44 B516 BPSK 5 16 21 44 QPSK 21 44 3 4 QPSK 3 4 7 8 QPSK 7 8 17 18 QPSK 17 18 OQ2144 OQPSK 21 44 OQ34 OQPSK 3 4 and OQ78 OQPSK 7 8 OQ1718 OQPSK 17 18 8P34 8PSK 3 4 8P78 8PSK 7 8 8P1718 8PSK 17 18 16034 16QAM 3 4 16Q78 16QAM 7 8 mmmmm mmm Data rate in KHz Where B D or V preset designator Note Setting the modulator rate turns off the RF transmitter SLM 7650 Satellite Modem Remote Control Specifications Modulator Rate Variable Assignment amp Selection Modulator Type Set Modulator Power Offset Set Modulator Output Power Level Modulator Scrambler Type Scrambler Enable Differential Encoder Enable Modulator Spectrum Rotation Command Response Status Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response lt add SMRV_nnnnn__mmmmm mmm cr gt add SMRV_nnnnn__mmmmm mmm cr RF_OFF cr If See MR command add MT xxxx cr gt xxxx cr If add MT cr gt xxxx cr If add MPO snn n cr gt
112. Possible Problem and Action MODULE Modulator section fault Typically indicates that the modulator will not program Return the modem for repair IF SYNTHESIZER Modulator IF synthesizer fault This is considered a major alarm and will turn off the modulator output Return the modem for repair DATA CLOCK SYN Transmit data clock synthesizer fault This is considered a major alarm and will turn off the modulator output This fault indicates that the internal clock VCO has not locked to the incoming data clock or the internal clock synthesizer has not locked to the internal reference Ensure the proper data rate has been set up and selected and the incoming data rate matches the modem selections CHANNEL Activity alarm for the channel digital filter This alarm is considered a major alarm and will turn off the modulator IF output An alarm in this position indicates either a fault in the scrambler or if the scrambler is disabled the alarm indicates a loss of incoming data If the fault is active with the scrambler turned off check for input data at the DATA I O connector If data is present return the modem for repair Q CHANNEL Activity alarm for the Q channel digital filter Use the channel procedure AGC LEVEL Output power AGC level fault Indicates the level at the modulator output is not the programmed level Return the modem for repair 5 9 SLM 7650 Satellite Modem Revision 4 Maintenance MN SLM7650 IOM 5
113. SCII encoded character strings The remote communications link is operated in a half duplex mode A remote controller or terminal initiates communications on the remote link The modem never transmits data on the link unless it is commanded to do so SLM 7650 Satellite Modem Revision 4 Remote Control Specifications MN SLM7650 IOM A 3 Message Structure Messages the remote link fall into the categories of commands and responses Commands are messages that are transmitted to the modem while responses are messages returned by the modem in response to a command The general message structure is as follows Start Character Device Address add Command Response End of Message Character 4 Start Character A single character precedes all messages transmitted the remote link This character flags the start of a message This character 15 lt lt for commands e gt for responses A 5 Device Address The device address 15 the address of the one modem which 15 designated to receive transmitted command or which is responding to a command Valid device addresses are 1 to 3 characters long and in the range of 0 to 255 Address 0 15 reserved as a global address which simultaneously addresses all devices on a given communications link Devices do not acknowledge global commands Each modem that is connected to a common remote communications link must be assigned its own unique address Addresses are selec
114. TE SERIAL b ANTENNA MICRO ITEREACE 52 POWER SUPPLY COMPUTER FAULT INDICATORS DEMODULATOR RECEIVE RF DECODER EQUIPMENT Figure 5 10 Baseband Loopback SATELLITE MODEM 5 20 SLM 7650 Satellite Modem Revision 4 Maintenance 9 3 4 3 5 3 4 3 1 5 3 4 3 2 5 3 4 3 3 MN SLM7650 IOM Carrier Modes There are three carrier test modes available in the Configuration Modulator menu The normal setting is Carrier mode OFF any of the carrier test modes will turn the IF Output OFF and the operator will be required to manually turn it back ON Center Carrier Wave Center Carrier Wave Figure 5 8 will turn off the modulation on the IF carrier center frequency will be transmitted at the output of the modulator This 15 useful for checking the frequency accuracy and phase noise of the modulator Offset Carrier Wave Offset Carrier Wave Figure 5 7 will present two sine waves 90 degrees apart to the IF carrier This will cause the carrier waveform to have a peak at the high end of the IF band pass and a lower peak to the left of center The center carrier will be present but at a low level This test mode 15 useful for checking the quadrature balance and carrier null The center carrier should be at or below 35 dBc from the carrier peak Dual Carrier Wave Dual Carrier Wave Figure 5 6 will generate a dual side band suppressed carrier signal This 15 useful for checking carrier null and quadrature b
115. TER Pressing CLEAR generally returns the display to the previous selection e and gt These keys are used to move to the next selection or to move the cursor for certain functions T and These keys are used primarily to change configuration data numbers but are also used at times to move from one section to another Front Panel Operation Front Panel Menu Operation When the modem is first powered ON the sign on message for the menu system displays This sign on message 15 also displayed when the CLEAR key is pressed repeatedly from anywhere within the menu system The sign on message displays the following information e Line 1 is the modem model number and type Line 2 is the version number of the M amp C firmware An overview of the first three layers in modem menu system is shown in Figure 3 3 Function Select is the main level of the menu system To access this level from the sign on message press any of the arrow keys The modem control and monitor parameters are accessed from the following Function Select menus Configuration Monitor Faults Alarms Stored Faults Alarms Remote Automatic Uplink Power Control AUPC Utility Press lt or to move from one selection to another When line 2 displays the desired function select that level by pressing ENTER After entering the appropriate functional level press to move to the desired function 3 3 SLM 7650 Satellite
116. YYY The current time 24 hour clock and date in the modem s memory are displayed when selected To change the modem time and or date press ENTER Press or gt to position the cursor over the parameter to be changed Press 1 or to change the parameter Once the parameters are displayed as desired press ENTER to set the time and date REMOTE SERIAL PORT Programs the baud rate settings and interface format in the modem To change the baud rate 110 to 38400 bps press ENTER Press lt or gt to position the cursor over the baud rate parameter Press 1 or 4 to select one of the following baud rates bps 110 150 300 600 1200 2400 4800 9600 19200 38400 Once the desired baud rate is displayed press ENTER to set the baud rate To change the remote interface format of the modem is displayed press ENTER Press lt or gt to position the cursor over the interface format parameter Press 1 or 4 to scroll through the available interface formats Once the desired format is displayed press ENTER to set the baud rate The number of data bits parity and stop bits is selectable Available formats are 7 data bits Even parity and 1 stop bits 7E1 7 data bits Odd parity and 1 stop bits 701 7 data bits Even parity and 2 stop bits 722 7 data bits Odd parity and 2 stop bits 702 or 8 data bits no parity and 1 stop bit 8N1 REMOTE ADDRESS The current modem address is displayed 1 to 25
117. ad Baud Rate ASYNC Transmit Channel Character Length ASYNC Transmit Channel Stop Bits ASYNC Transmit Channel Parity ASYNC Receive Channel Character Length ASYNC Receive Channel Stop Bits ASYNC Receive Channel Parity ASYNC Communica tions Type Revision 4 MN SLM7650 IOM Asynchronous Interface Commands Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response add TOBR nnnnn cr add TOBR nnnnn cr If add TOBR add TOBR lt add ROBR_nnnnn cr add ROBR nnnnn cr If add ROBR add ROBR nnnnn cr lf add TCCL n cr gt add TCCL_n cr lf add TCCL cr gt add TCCL_n cr lf add TCSB n cr add TCSB add TCSB cr add TCSB n cr If add TOCP xxxx cr gt add TOCP_xxxx cr lf add TOCP gt add TOCP_xxxx cr lf add RCCL n cr add RCCL lt add RCCL add RCCL add RCSB n cr add RCSB n cr If add RCSB cr add RCSB add ROCP xxxx cr gt xxxx cr If gt add ROCP_ xxxx cr lf add ACT
118. add RDA xxx cr f RX 8PSK Command add R310 xxx cr Where xxx ON or OFF IESS 310 Response 2add R310 xxx cr If Operation Status add R310 cr Response 2add R310 xxx cr If Demodulator Command add DRSC nnn kkk i cr Where nnn i 225 205 8 225 205 4 219 201 8 Reed Response add DRSC nnn 219 201 4 194 178 4 126 112 4 Solomon Codeword Status add DRSC Note This command is valid only in modem type CUSTOM Response add DRSC nnn when overhead type is NONE Status is available at all times Bulk Command add BDC p1 p2 pn cr This command causes the modulator to be programmed Configuration Response gt add BDC_p1 p2 pn cr If with supplied parameters All parameters are separated by comma except for the last parameter which has the Status lt add BDC_ cr standard command termination character Parameters Response gt add BDC_p1 p2 pn cr If that do not need to be changed can be nulled no data between comma s Parameter 1 Sweep Width Range ref SWR nnnnn where nnnnn is the sweep range in Hz Parameter 2 Bit Error Rate Threshold ref BERT P2 n where n 0 for NONE or 3 to 8 Parameter 3 Demodulator IF frequency ref DF command P3 nnn nnnnnn IF frequency in MHz Parameter 4 Demodulator Rate Variable Assign amp Select ref
119. ake the selection Press ENTER to execute the change FRAMING STRUCTURE Select the Terrestrial interface frame structure This function is used with the BUFFER SIZE program to allow plesiochronous slips in the buffer Available selections are T1 NONE G 704 E1 NONE or G 704 T2 NONE or G 704 G 743 or G 747 E2 NONE or G 704 G 742 or G 745 default parameters TX DATA PHASE TX data phase relationship Use this option to select Normal or Invert for the TX data relationship to the selected TX clock On entry press an arrow key to make the selection Press ENTER to execute the change RX DATA PHASE RX data phase relationship Use this option to select Normal or Invert for the TX data relationship to the selected RX clock On entry press an arrow key to make the selection Press ENTER to execute the change IDR BACKWARD ALARM Controls IDR monitor and alarm functions reporting Use this option to select on or off CONTROL for the RX and TX alarms On entry the BW ALARM RX or BW ALARM TX is displayed on line 1 Press an arrow key to select BW alarm RX or TX numbers 1 through 4 on line 2 Press ENTER to execute the change IDR ESC TYPE Selects the IDR ESC 2 32 kbps ADPCM Audio or 64 kbps data channel 3 30 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM 3 4 6 4 Utility System Menu Menem 00 Specifications usage TIME HH MM SS Time of day and date display set function DATE MM DD Y
120. al ST 2 TX Terrestrial Clock Terminal Timing TT TIA EIA 449 pins 17 and 35 3 External Master Clock MC pins 16 and 34 4 RX Satellite Buffer is OFF Note The highlighted denotes Master Clock and the doted box denotes the clock schematic 4 24 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 4 3 3 2 1 Timing Configuration 1 User Provides Clock Modem Reference clock is either INT 1 5 10 or 20 MHz TX clock source TX Terrestrial Buffer clock also is using TX Terrestrial This user is ignoring the internal modem clock and providing timing to the modem Figure 4 2 Internal clock User Reference provides the detect clock for SD TX IF Output TT RT clocks in the RD Clock Master Modem User User Figure 4 2 User Provides Clock 4 25 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 4 3 3 2 2 Timing Configuration 2 Modem Provides Clock Modem Reference clock is either INT 1 5 10 or 20 MHz TX clock source TX terrestrial Buffer clock also is using TX Terrestrial This user is using the internal modem clock ST as the system clock Figure 4 3 Internal clock Reference User clocks detect TT and SD from ST IF Output TT x TRANSMIT in the RD From decoder x Buffer N RT clocks Clock Master
121. alance The two peaks should be at the same output level The modulator is presented with alternating ones and zeroes 5 21 SLM 7650 Satellite Modem Revision 4 Maintenance 5 3 4 4 5 3 4 5 MN SLM7650 IOM Reed Solomon Correction OFF The Reed Solomon 5 decoder data error correction circuitry can be disabled without removing the overhead associated with the R S FEC When R S Correction is set to OFF Configuration Demodulator menu the data flow 15 then routed through normal data paths without 5 error corrections Only Viterbi error correction will be active This test mode will allow a more timely verification of link performance 2047 and 188 Test Patterns The operator is capable of substituting a test pattern on the transmit side and monitoring on the receive side of the modem These test pattern can be used as a quick BER performance test to verify that the link performance 15 operating at a reasonable error rate The BER performance 15 read in the Monitor 2047 error menu If the carrier is not locked the Monitor menu will display No Data The normal setting for both the TX 2047 Pattern and the RX 2047 Pattern is NONE The 2047 setting 15 a standard pattern compatible with a Fireberd BERT The MIL 188 setting is a modified 2047 pattern that is used to test the Data Source Sync function of the modem It has the maximum number of consecutive zeros that the modem can handle when recovering the clock from the da
122. aling The choices are E1 CCS E1 Common Channel Signaling E1 CAS E1 Channel Associated Signaling T1 T1 Data D4 framing T1 ESF T1 Extended Super Frame Note This menu is only available for the D amp I option On entry the current drop data channel signal is displayed Press an arrow key to make the selection Press ENTER to execute the change INSERT FORMAT Selects the desired insert data channel signaling The choices are E1 CCS E1 Common Channel Signaling E1 CAS E1 Channel Associated Signaling T1 T1 Data D4 framing T1 ESF T1 Extended Super Frame Note This menu is only available for the D amp I option On entry the current insert data channel signal is displayed Press an arrow key to make the selection Press ENTER to execute the change 3 15 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM Specifications usage DROP CHANNEL Drop Channel Assignments Maps terrestrial time slots to transmit satellite channels ASSIGNMENTS Terrestrial time slots T1 1 to 24 E1 CCS 1 to 31 E1 CAS 1 to 15 and 17 to 31 Channels 1 to N N Satellite Data Rate 64 kbps N 30 1920 0 kbps is a transparent mode which disables time slot to channel mapping On entry drop channel 1 and the current time slot are displayed Press 1 or to select the drop channel to be programmed Press ENTER to begin programming Press 1 V to select the time slot for each
123. ates are referenced in paragraph 3 3 Note These assignments are used for the selection of the TX rate in Configuration Modulator menu MOD POWER OFFSET Modulator power offset adjust Offsets the modulator output power readout in the Configuration menu This feature does not actually change the modulator power level but displays an offset value in the monitor The modulator power offset range is 69 9 to 94 9 dB in 0 1 dB steps Note Anything except 0 0 dB will cause ADJ to be displayed in the TX power level screen MODULATOR TYPE Transmit filter type select Select INTELSAT OPEN or EFD CLOSED network filtering Note This window is only available when CUSTOM is selected for modem type in the Utility menu ENCODER TYPE FEC type select Select VITERBI or TURBO Note This window is only available when CUSTOM or EFD is selected for modem type in the Utility Menu TX BPSK ORDERING Transmit BPSK bit ordering selection Select STANDARD or NON STANDARD Press an arrow key to make the selection Press ENTER to execute the change MOD SPECTRUM Programmable vector rotation Allows the operator to select Normal or Inverted INVERT for spectrum reversal of the and Q baseband channels Press an arrow key to make the selection Press ENTER to execute the change TX IESS 310 MODE Select IESS 310 mode on or off IESS 310 mode is for 8 PSK 2 3 modulation with Reed Solomon only Press an arrow key to make the selection Press ENTER to exec
124. ator a T red test 3 29 MEALS DI TE un kuu 3 30 TEES gps S EC EGO TO DRE ead ne t 3 31 Modem un uD 3 33 3 5 Modes OF Opera UoN as O 3 34 050 00 tento atuk 3 34 1050502 OC acter 3 35 S Sim 3 37 18 QR NR 3 39 3 5 95 0 3 41 18 09 ofc 21 10 0 Rem ee u u trad Cn 3 43 ___ 3 45 555 EFD OPAO uuu _ 3 47 3 9 9 ODOLALTOB S 3 49 SLM 7650 Satellite Modem Revision 4 Preface MN SLM7650 IOM CHAPTER THEORY OF OPERATION bas vt 4 1 4 1 Oyeryview a oa 4 1 4 2 M 4 1 4 3 Pec 4 3 451 Differential FORET 4 3 ka S19
125. because the modem configuration may not have been retained in the memory chip Let the modem run for 24 hours to see if the alarm clears Replace the battery HW M4T 28 if the alarm does not clear Refer to paragraph 5 2 2 12 Vdc SUPPLY 12 Vdc 5 power supply fault Indicates a high or low voltage condition for the 12 Vdc power supply Return to modem for repair 12 Vdc SUPPLY 12 Vdc 5 power supply fault Indicates a high or low voltage condition for the 12 Vdc power supply Return to modem for repair 5 SUPPLY 5 5 power supply fault Indicates a high or low voltage condition for the 5 Vdc power supply Return to modem for repair 3 3 SUPPLY 3 3 590 power fault Indicates high low voltage condition for the 3 3 power supply Return to modem repair 2 5 Vdc SUPPLY 2 5 5 power supply fault Indicates a high or low voltage condition for the 2 5 Vdc t power supply Return to modem repair 1 8 Vdc SUPPLY 1 8 5 power fault Indicates a high or low voltage condition for the 1 8 Vdc power supply Return to modem repair TEMPERATURE Over Under Temperature Fault Indicates that the internal temperature of the modem has exceeded 75 degrees C or is below 10 degrees C Could indicate that the fan is not operating properly Also assure the proper operating temperature environment for the modem Modem Reference PLL Modem Refer
126. bps RXV Modulator Power Offset FD Closed Modulator Type TX BPSK Ordering MOD Spectrum TX IESS 310 Mode n cu Encoder Type Viterbi Interface TX Overhead Type ASYNC ormal RX Overhead Type RTS TX IF CNTRL 3273 Buffer Program p System Modem Reference Operation Mode lt O Z O HTII iterbi n 3 46 SLM 7650 Satellite Modem Revision 4 Operation 3 5 8 MN SLM7650 IOM EFD Operation The EFD mode of operation 15 the basic closed network non OM 73 operating mode of the modem compatible with the EFD mode in any Comtech EF Data legacy satellite modem The modem does not require any additional hardware installed to operate in EFD mode The EFD mode does not allow any overhead to be added to the selected data rates but the full range of data rate code rate FEC options and modulation types are available The data type will be 188 RS 422 An optional overhead card 15 required for G 703 or any other baseband interface 3 47 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM Table 3 11 EFD Default Parameters Function Configuration Osecmds 0 Of RX Satelite PRX Clock Phase Utility TXSS30Mde Jon NONE Buffer Progam o OpmaonMode 3 48 SLM 7650 Satel
127. command is used to select reading of 2047 or MIL188 errors Notes The X lt or gt parameter is only returned if the error rate has exceeded the computational resolution of the system Data is returned if the error rate cannot be calculated Sampling is returned if not enough data is currently available to calculate the error rate 33 SLM 7650 Satellite Modem Revision 4 Remote Control Specifications MN SLM7650 IOM Frame Error Command add FBER Where Status Response gt x lt or gt data modifier to indicate that the error rate is less than or greater than the returned value m m 1 0 to 9 9 error rate mantissa ee 1 to 99 error rate exponent Notes The x lt or gt parameter is only returned if the error rate has exceeded the computational resolution of the system Data is returned if the error rate cannot be calculated eampling is returned if not enough data is currently available to calculate the error rate Command add EBNO Where Response xnn ndB cr If x lt or gt data modifier to indicate that the Eb NO is less than or greater than the returned value nn n 1 0 to 99 9 Eb NO value Notes The lt gt parameter is only returned if the Eb NO has exceeded the computational resolution of the system No Data is returned if the Eb NO cannot be cal
128. ct fault Indicates the demodulator decoder is not locked IF SYNTHESIZER Demodulator IF synthesizer fault Indicates the IF synthesizer is not locked demodulator quadrature demodulator menu 3 22 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM 3 4 3 3 Transmit Interface Faults 0 Specifications usage MODULE TX Interface section fault Typically indicates that the TX Interface section will not program TX DATA AIS Data or AIS When DATA fault is selected in the Configuration Interface menu the fault indicates data stable condition This indicates the data is all 1s or Os 1 data is not transitioning When AIS is selected the alarm indicates the data is all 1s from customer data input to the modem When NONE is selected the TX Data AIS Fault Alarm is not activated Note AIS is an alarm not a switching fault TX CLK ACTIVITY Activity detector alarm of the selected interface transmit clock The interface will fall back to the internal clock SCT when this alarm is active TX CLK PLL Indicates TX input clock is out of range SCT PLL SCT phase locked loop PLL fault Indicates the internal transmit clock oscillator PLL is not locked to the selected reference SCT REFERENCE ACT Activity detector alarm at the input of the selected source for SCT Reference Indicates the selected clock is not being detected TX DROP Drop interface fault Typically indicates that terrestrial data stream is not
129. culated is returned if not enough data is currently available to calculate the Eb NO Modulator Command add MR Where Rate Status Response gt add MR_nnnnn_mmmmm mmmi cr If nnnnn 1 2 QPSK 1 2 3 4 QPSK 3 4 7 8 QPSK 7 8 BP12 BPSK 1 2 8P23 8PSK 2 3 8P56 8PSK 5 6 0012 5 1 2 OQ34 OQPSK 3 4 and 0078 OQPSK 7 8 BPSK BPSK 1 1 QPSK QPSK 1 1 OQSK OQPSK 1 1 16034 16QAM 3 4 16078 16QAM 7 8 B2144 BPSK 21 44 B516 BPSK 5 16 21 44 QPSK 21 44 17 18 QPSK 17 18 OQ2144 OQPSK 21 44 OQ1718 OQPSK 17 18 8 4 8 5 3 4 8 78 8PSK 7 8 8P1718 8PSK 17 18 mmmmm mmm Data rate in kHz Demod Command add DR cr Where Rate Status Response add DR nnnnn mmmmm mmmv cr If nnnnn 1 2 QPSK 1 2 3 4 QPSK 3 4 7 8 QPSK 7 8 BP12 BPSK 1 2 8 23 8PSK 2 3 8P56 8PSK 5 6 0012 OQPSK 1 2 OQ34 OQPSK 3 4 and OQ78 OQPSK 7 8 BPSK BPSK 1 1 QPSK QPSK 1 1 OQSK OQPSK 1 1 16034 16QAM 3 4 16078 16QAM 7 8 B2144 BPSK 21 44 B516 BPSK 5 16 21 44 QPSK 21 44 17 18 QPSK 17 18 OQ2144 OQPSK 21 44 OQ1718 OQPSK 17 18 8P34 8PSK 3 4 8P78 8PSK 7 8 8P1718 8PSK 17 18 mmmmm mmm Data rate in kHz A 34 SLM 7650 Satellite Modem Revision 4 Remote Control Specifications MN SLM7650 IOM Receive Command add RSL Where Signal Level Response 2add RSL xsnn ndBm cr If Status x lt or gt data
130. d P34 n where n is 0 OFF or 1 ON Parameter 35 IDR Backward Alarm TX2 ref BW TX2 command P35 n where n is 0 OFF or 1 ON Parameter 36 IDR Backward Alarm TX3 ref BW TX3 command P36 n where n is 0 OFF or 1 ON Parameter 37 IDR Backward Alarm TX4 ref BW 4 command P37 n where n is 0 OFF or 1 ON Parameter 38 IDR Transmit ESC Type ref P38 0 where n is 0 2x32Kbit s Audio or 1 64Kbit s Data SLM 7650 Satellite Modem Remote Control Specifications A 9 Set Demodulator Frequency Demodulator Rate Preset Assignment Demodulator Rate Preset Selection Demodulator Rate Variable Assignment amp Selection Demodulator Configuration Command Response Status Response Command Response Status Response Command Response Status Command Response Status lt add DF_nnn nnnnnn cr add DF nnn nnnnnn cr If add DF add DF nnn nnnnnn cr If add ADRx nnnnn mmmmm mmm cr add ADRx nnnnn mmmmm mmm lt add ADRx_ cr gt add ADRx_nnnnn_mmmmm mmm lt add SDRx_ cr add SDRx cr If See DR command add SDRV nnnnn mmmmm mmm cr add SDRV nnnnn mmmmm mmm 1 See DR command Revision 4 MN SLM7650 IOM Where nnn nnnnnn Frequency in MHz 50 000000 to 90 000000 and 100 000000 to 180 000000 in 1 Hz
131. d loopback ref BBL_ command reserved null field Interface loop timing ref command TX Interface coding format ref command RX Interface coding format ref ICFR command Buffer clock source ref command Interface RX T1 frame structure ref 5 command Interface RX T2 frame structure ref 5 command Interface RX E1 frame structure ref 5 command Interface RX E2 frame structure ref IRFS command Interface Buffer Programming ref command Interface buffer size ref 185 _ command Interface transmit overhead type ref ITOT command Interface receive overhead type ref command Interface substitution pattern ref 15 command Interface read error ref command Revision 4 MN SLM7650 IOM Description p35 n where n is 0 or 1 INV p36 n where n is 0 NRM 1 p37 n where n is 0 OFF 1 ON p39 n where n is 0 OFF or 1 ON P40 n where n is 0 AMI 1 8625 2 8825 or 3 HDB3 P41 n where n is 0 AMI 1 8625 2 8825 or 3 HDB3 p42 n where n is 0 INT 1 REF 2 EXT 3 SAT or 5 INS p43 n where n is NONE or 1 G704 p44 n where n is 0 1 G704 3 G743 or 5 747 p45 n where n is NONE
132. d network applications operating in compliance with Appendix K of the IESS 309 Intelsat standard The VSAT IBS mode does not allow any overhead to be added to the selected data rates but requires Reed Solomon concatenated outer coding The R S parameters that are required for this mode of operation are n 219 k 201 129 with an interleaver depth of 4 The available IBS data rates are n x 64 kbps from 64 kbps to 8 448 Mbps The data type will be MIL 188 RS 422 and an optional overhead card is required for G 703 or any other baseband interface 3 41 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM Table 3 8 VSAT IBS Default Parameters Function Configuration Osecmds Of RX Satelite PRX Clock Phase Utility Encoder Type SSS Interface BufePogam Bis ooo OpmaionMode 3 42 SLM 7650 Satellite Modem Revision 4 Operation 3 5 6 MN SLM7650 IOM IBS 309 Operation The IBS 309 mode of operation configures the modem for basic IBS operation without the addition of the overhead card The IBS 309 mode 15 used for open network applications operating in compliance with TN309 5 of the IESS 309 Intelsat standard When IBS 309 mode is active an overhead of 6 667 will be added to the selected data rates The available IBS data rates are n x 64 kbps from 64 kbps to 2 048 Mbps Optional Reed Solomon R S concatenated outer coding
133. d the setup is very straightforward The bottom example shows how the ASLT allows for loop timing the transmission link as if the data rates were equal The timing standard at the master station is used for the complete duplex asymmetrical satellite link The synthesized phase lock loop circuit 15 used at the slave end of the link to ensure that the ST output clock 15 phase locked to the receive recovered satellite clock If ASLT is selected to be ON the RX Sat clock 15 configured as the SCT PLL REF source There are however data rate restrictions and one of the following constraints must be satisfied The receive data rate is equal to the transmit data rate The transmit data rate and the receive data rate are both integer multiples of 600 Hz e The transmit data rate and the receive data rate are both integer multiples of 1 kHz 4 32 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 4 3 3 5 Buffering There are two primary purposes for a receive FIFO buffer in a satellite modem One is to compensate for periodic changes in the receive data rate caused by the satellite movement Doppler shift and the other is to provide a controlled reset to compensate for small differences in master timing standards at two ends of the satellite link Plesiochronous timing The same receive buffer 1s used to compensate for the Doppler shift and for plesiochronous timing The receive buffer
134. ddition of the overhead card The IDR mode is used for open network applications operating in compliance with the IESS 308 IDR and IESS 310 TCM IDR Intelsat standards When the IDR mode is active a fixed overhead of 96 kbps will be added to the selected data rates Within the data rate range of the modem there are four IDR operating rates 1 544 2 048 6 312 and 8 448 Mbps Optional Reed Solomon R S concatenated outer coding compatible with the IESS 308 and IESS 310 standards is supported in this mode Refer to the modem specification for the specific R S parameters that apply to each data rate Operation in this mode requires the IDR framing option to be activated The data type will be MIL 188 RS 422 and there will not be any access to the Intelsat defined ESC overhead data An optional overhead card is required for G 703 or any other baseband interface and to gain access to the ESC overhead data 3 37 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM Table 3 6 IDR Default Parameters Function Configuration Osecmds 0 Of RX Satelite RXCokPhae Nom Utility 11 70 Interface Overhead Type IDR _________ Normal RX Overhead Type IDR RX Data Phase Noma Bufer Progam 81 1 Duplex 3 38 SLM 7650 Satellite Modem Revision 4 Operation 3 5 4 MN SLM7650 IOM
135. e differential decoder produces two The problem for QPSK is more complex as there are 4 possible lock states leading to 4 ambiguities When FEC is employed the lock state of the FEC decoder can be used to resolve two of the four ambiguities and the remaining two can be resolved using serial differential encoding decoding However when no FEC 15 being used an entirely different scheme must be used Therefore in QPSK a parallel differential encoding decoding technique 15 used but has the disadvantage that 1 again doubles the receive BER OQPSK is a different situation again where the ambiguities result not only from not having an absolute phase reference but also not knowing which of the two parallel paths in the demod I or Q contains the half symbol delay Another type of differential encoding is used but yet again the error rate is doubled compared to ideal The second problem inherent in PSK demodulators is that of data false locking When data at a certain symbol rate is used to modulate the carrier the demodulator can lock at incorrect frequencies spaced at intervals of one quarter of the symbol rate away from the carrier Fortunately when FEC decoding is used the decoder synchronization state can be used to verify the correct lock point has been achieved and to reject the false locks However if uncoded operation is used there is no way to recognize a data false lock The demodulator will indicate that it is correctly
136. e maintenance philosophy of the SLM 7650 identifies the modem 15 the LRU If the modem 15 found to be faulty remove the modem from the rack and return to the depot for repair The fault isolation procedure lists the following categories of faults or alarms Modulator Demodulator e Transmit Interface e Receive Interface e Common Equipment Fan A six month fan inspection is suggested Listen for uncommon fan noise and check that air 15 flowing out of the back of the modem 8 C Battery There is a small battery in the monitor and control section that may need to be replaced every 5 years Schedule periodic replacement every four years or if a battery low alarm occurs while the modem has been plugged in The battery part number is BTM4T28 BRI2SH The Comtech EF Data part number is HW M4T28 The battery fits on a surface mount integrated chip that functions as a timekeeper and memory device The battery voltage is checked upon power up and automatically every 24 hours as long as the device 15 powered up A battery low alarm will be generated if the voltage falls below 2 5 Vdc The modem configuration should be checked if the battery low alarm occurs on power up because the data integrity may be compromised if the battery voltage falls below 2 5 Vdc A fresh battery should be installed if the battery alarm is generated during the 24 hour interval check This indicates that the battery 1s near end of life The modem configuratio
137. e the IF signal a consistent and uniform shape The output IF signal will not look correct if the scrambler is Off and no data is applied Scrambling is often referred to as Energy dispersal There are generally two types of scramblers in satellite modems e The self synchronizing scrambler e The synchronous scrambler The descrambler simply works the reverse direction as a scrambler to provide proper data output from the modem 4 3 2 1 Self Synchronizing Scrambler Descrambler The Self Synchronizing Scrambler uses the input data stream to assist in the scrambling method This will result in three output data errors for every single error out of the descrambler There are many variations the design of the V 35 scramblers The ITU RS 524 4 is the source document for this scrambler Selecting one of the following scrambling methods does not guarantee compatibility with other manufacturers scrambling methods The self synchronizing scrambler is used in the following EF Data closed network Open network IDR IESS 308 OM73 MD 1002 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 3 2 2 4 3 3 4 3 3 1 Synchronous Scrambler Descrambler The Synchronous Scrambler does not multiply errors and is very suited for framed data applications The initial sequence of the frame may be used to start the scrambler Because there is no error multiplication there is a 0 2 dB BER gain for the synchronous scrambler T
138. eason the data must be interleaved following R S encoding and is then de interleaved prior to R S decoding This ensures that a single burst of errors leaving the Viterbi decoder is spread out over a number of interleaving frames so errors entering the R S decoder do not exceed its capacity to correct those errors In the case of the modulator different RS code rates are used according to the mode of operation Refer to the modulator specification in Appendix C for details on the code rates and interleave depth for each operating mode A characteristic of concatenated RS coding is the very pronounced threshold effect For any given modem design there will be a threshold value of Eb No below which the demodulator cannot stay synchronized This may be due to the carrier recovery circuits or the synchronization threshold of the primary FEC device or both In the SLM 7650 and Rate 1 2 operation this threshold 15 around 4 dB Eb No Below this value operation is not possible but above this value the error performance of the concatenated RS system produces exceptionally low error rates for a very small increase in Eb No 4 5 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM gt IMPORTANT 4 3 3 3 Care should be taken not to operate the demodulator near its threshold Small fluctuations in Eb No may cause total loss of the link with the subsequent need for the demodulator to re acquire the signal
139. eing received at the earth station will be at a slightly higher rate If the satellite distance increases then the receive frequency at the earth station will be at a lower rate The effects of the rate changes can be nullified by the receive buffer The buffer will fill up and overflow if the buffer clock is Slower than the recovered clock from the satellite The buffer will empty if the buffer clock is faster than the recovered clock from the satellite The buffer will recenter when the buffer overflows or underflows An overflow or underflow of the receive buffer will cause a loss of the data that 15 in the buffer Proper configuration of the buffer will minimize the adverse affects on the overall communication network A loss of bit count integrity BCI will not cause the buffer to recenter The buffer will recenter if the decoder looses lock The time between clock slips can be calculated as follows T B 2 A Where e B Total Buffer size Difference in frequency T Time in seconds The buffer size 15 divided in half because the buffer starts at the 50 fill state The following tables are used to determine buffer size e Table 4 7 will provide the delay variations expected for an inclined orbit satellite e Table 4 8 gives some recommended buffer sizes based on the examples that follow Table 4 7 Delay Variations for Inclined Orbit Satellites Maximum variations 1 1 26 33 Note The maximum variations are based on
140. ence lock fault The internal modem reference has failed to lock to the selected reference Return the modem for repair Modem Reference External modem reference activity fault Activity Indicates the external modem reference signal is not detected at CP3 on the rear panel 5 13 SLM 7650 Satellite Modem Revision 4 Maintenance MN SLM7650 IOM 5 3 Modem Performance Verification Tests However if more detailed verification is required Table 5 7 lists common test equipment that is generally used for modem verification Refer to the test set up in Figure 5 5 for all of the modem verification tests Table 5 7 Test Equipment Required Item Type Quantity Description and Usage HP 8560E Spectrum Analyser or equivalent Spectrum Analyser RF frequency counter Up to 200 MHZ capability with high stability time base 1 1 1 Minimum requirement is 10 dBm to 40 dBm 1 1 Note The BER tester should be equipped with the appropriate Data Interface RS422 V 35 etc and the necessary data interface cables Noise Test Set NoiseCom or equivalent Oscilloscope 1 General purpose 2 channel oscilloscope with X Y capability Host Computer Power Meter Gigatronics 8541 Spectrum Analyzer 5232 toRS422 Ext Ref Converter Universal Time Interval Counter Bit Error Rate Tester 1 Fireberd 6000 Bit Error Rate Tester or equivalent Used for BER measurements under various Eb No conditions Remote SLM 7650 Demodulator No
141. ent It provides very useful levels of coding gain and its short decoding delay and error burst characteristics make it particularly suitable for low data rate coded voice applications It has a short constraint length fixed at 7 for all code rates The constraint length is defined as the number of output symbols from the encoder that are affected by a single input bit By choosing various coding rates Rate 1 2 3 4 or 7 8 the user can trade off coding gain for bandwidth expansion Rate 1 2 coding gives the best improvement in error rate but doubles the transmitted data rate and hence doubles the occupied bandwidth of the signal Rate 7 8 coding at the other extreme provides the most modest improvement in performance but only expands the transmitted bandwidth by 14 A major advantage of the Viterbi decoding method 15 that the performance 15 independent of data rate and does not display a pronounced threshold effect 1 e does not fail rapidly below a certain value of Eb No Because the method of convolutional coding used with Viterbi the encoder does not preserve the original data intact and is called non systematic SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 3 3 2 The available CEVD rates offered are Rate 1 2 is offered for BPSK e Rates 1 2 3 4 and 7 8 for QPSK and OQPSK e Rates 3 4 and 7 8 are offered for 16 QAM Table 4 1 Viterbi Decoding Summary FOR AGAINST Good BER performance
142. er level to the AUPC The maximum power level can range from 5 to 30 dBm in 0 1 dBm steps On entry the current maximum power level is displayed Press an arrow key to increment or decrement the digit at the flashing cursor Press ENTER to execute the change TARGET Programs the E No target set point The E No target set point ranges from 3 2 to 16 0 dB in 0 1 dB steps On entry the current E No target set point is displayed Press an arrow key to increment or decrement the digit at the flashing cursor Press ENTER to execute the change TRACKING RATE Programs the maximum tracking rate of the AUPC Maximum tracking rate can range from 0 5 to 6 0 dBm per minute in 0 5 dB steps On entry the current maximum tracking rate is displayed Press an arrow key to increment or decrement the digit at the flashing cursor Press ENTER to execute the change LOCAL CL ACTION Choices are HOLD NOMINAL MAXIMUM If the local demodulator loses lock then the modulator output level will change depending on the selected choice The choices are HOLD to the current level Return to the selected NOMINAL level To shoot to the selected MAXIMUM power level On entry the current status of the local carrier loss is displayed Press an arrow key to make the selection Press ENTER to execute the change REMOTE CL ACTION Choices are HOLD NOMINAL MAXIMUM This will cause the local modulator output level to change depending on the distant ends loss of
143. er than Custom Status can always be sent Where snn n 94 9 to 69 9 in 0 1 dB increments Note The modulator power offset is added to the nominal power level to adjust the transmit power range Where snn n 30 0 to 5 0 in 0 1 steps nominal range in dBm Notes 2 The nominal power range is modified relative to the value specified by the modulator power offset MPO The MOP command will return status only when local AUPC is enabled Where xxxx IESS OM73 or TURBO Where xxx ON or OFF Where xxx ON or OFF Where xxx NRM normal spectrum or INV inverted spectrum add RSEN xxx cr Where xxx ON or OFF 5 SLM 7650 Satellite Modem Remote Control Specifications Solomon Encoder Enable Transmit BPSK Data Ordering Carrier Only Mode TX 8PSK IESS 310 Operation Modulator Encoder Type Modulator Reed Solomon Codeword Bulk Configur Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response gt add RSEN_xxx cr OFF cr If add RSEN cr 2add RSEN xxx cr If add TDA xxx cr gt xxx cr If add TDA gt add TDA_xxx cr If add COM xxxxxx cr gt _
144. erential Decoder Buffer 4 14 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM The modulated signal at 70 20 MHz 140 40 MHz enters the IF section for conversion to I and Q analog baseband channels The I and Q channels are then passed through identical anti alias filters offset amplifiers and DAC The digitized I and Q data is then sent to the digital Nyquist filters resulting in a filtered digital representation of the received signal The digital data is then sent to four separate circuits Automatic Gain Offset Control Carrier Recovery Costas Loop Clock Recovery Loop Soft Decision Mapping The AGC provides a gain feedback signal to the IF section to ensure that the digital representation of the I and Q channels 15 optimized for the Costas and Clock loops as well as the soft decision mapping circuitry The digital Costas loop in conjunction with a DDS performs the carrier recovery function The Costas loop consists of a Costas phase detector loop filter and DDS all implemented digitally The DDS performs the function of a Voltage Controlled Oscillator VCO in an analog implementation but can be easily programmed to the desired center frequency via the M amp C The output of the DDS 15 sent to the IF section providing the reference to which the quadrature local oscillator is locked The M amp C sweeps the local oscillator via DDS programming through the user specified sweep range
145. erflow Buffer Underflow Battery Clock Temperature SLM 7650 Satellite Modem Revision 4 Maintenance MN SLM7650 IOM Table 5 1 SLM7650 Fault Tree Cont PARAMETER LL LL gt lt Backward Alarms IDR with option card Backward AlarmRX 1 Backward 2 Backward Alarm RX 3 Backward Alarm Backward Alarm TX 1 Backward AlarmTX 2 Backward Alarm 3 Backward Alarm TX 4 _ peau 21111114 RkrAutr Lep RED FAULT LL LLL paver revay LLL LLL L LLL JXxFAULTLED YELLOW ALARM 21111 FxALARMRELAY ___ as 11111111 tes PRower ALARM RELAY 1 11111111 XFAULTLED RED FAULT 12151511 IXFAULT LED YELLOW ALARM _ fies service ALARM RELAY o L LLL _________ 5 ALARM 1 _ ORDER MAINT ALARM 2 _ LE 18 D TERRESTRIALBWA 3 Note Description ___ IBS alarms are available with IBS D amp l operation and with the option card installed 1 IDR Deferred Maintenance Alarm is available with IDR operation and option card installed D amp I Terrestrial Backward Alarm is available with D amp I operation and with option card installed 5 SLM 7650 Satellite Modem Revision 4 Maintenance 5 2 4 MN SLM7650 IOM Fault Alarm Display and Description
146. esponse Command Response Status Response Command Response Status Response Command Response Status Response add LPC xxx cr add LPC lt cr gt xxx cr If add NOMP gt snn n cr If add NOMP add NOMP snn n cr If add MAXP snn n cr add MAXP add MAXP gt add MAXP_snn n cr If add MINP snn n cr gt snn n cr If add MINP gt snn n cr If add ENSP nn n cr 2add ENSP nn n cr If add ENSP cr 2add ENSP nn n cr If add MAXT n n cr gt n n cr If add MAXT gt 1 add LCL gt add LCL gt add RCL xxxx cr gt xxxx cr If add RCL gt add RCL_xxxx cr If Where xxx ON or OFF Notes 1 When programmed ON the MOP Modulator Output Power command is not allowed only MOP status is allowed 2 ASYNC Overhead only Where snn n 30 0 to 5 0 in 0 1 steps nominal range in dBm Notes 1 ASYNC Overhead only Where snn n 30 0 to 5 0 in 0 1 steps nominal range in dBm Notes 1 ASYNC Overhead only Where snn n 30 0 to 5 0 in 0 1 steps nominal range in dBm Notes 1 ASYNC Overhead only Where nn n 3 2 to 16 0 in 0 1 increments in dB
147. estrial ASYNC Source ASYNC Transmit Overhead Baud Rate ASYNC Transmit Channel Character Length ASYNC Transmit Channel Stop Bits ASYNC Transmit Channel Parity ASYNC Communications Type AUPC Nominal Power Value AUPC Minimum Power Value AUPC Maximum Power Value AUPC Local Carrier Loss AUPC Remote Carrier Loss RTS TX IF Control Mode Transmit BPSK Data Ordering Carrier Only Mode Scrambler Type TX 8PSK IESS 310 Operation Reed Solomon Codeword RF Output ON OFF Note This command is used by the EF Data M N protection switch to collect information that is necessary to configure back up modems Because this command content and or order can be changed at any time by EF Data it is advisable that other commands 5 and ICS or BCS be used for M amp C systems Revision 4 SLM 7650 Satellite Modem MN SLM7650 IOM Remote Control Specifications Notes Data is only returned for TX ASYNC Overhead Data not returned if Local AUPC is enabled amp TX overhead Data is only returned for TX ASYNC Overhead Mux Data is only returned when the modem type is set to CUSTOM and TX Overhead is either NONE or ASYNC Data is only returned when the option card is installed and TX Overhead is IDR Data is only returned when the option card is installed and TX Overhead is DI Data is only returned when the option card is installed Data is only returned when the option card is installed and TX Overhead is ASYNC
148. f the Reed Solomon decoder data error S correction circuitry Data flow is then routed through normal data paths without error corrections Only Viterbi error correction will be On OFF RS decoder is normally disabled Off position To execute any of the Reed Solomon decoder modes enter the desired Reed Solomon decoder and select the desired mode On entry the current status of the Reed Solomon decoder is displayed Use an arrow key to select the desired mode Press ENTER to execute the change 3 11 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM 3 4 1 3 Interface Menu Menu Item Specifications usage TX CLOCK SOURCE Programs the clock source for the modem transmitter clock to the following configurations TX Terrestrial Selecting TX Terrestrial will clock the data to the encoder using the customer terrestrial clock Another term for this clock is terminal timing SCT Internal Setting SCT as the TX clock source will clock the data to the encoder using the internal clock of the modem This indication will change to SCT Loop when loop timing is turned on Data Source Sync The Clock for the modem input data will be recovered from the transitions of the input data This clock is then used to phase lock the internal SCT clock and to clock the transmit data to the encoder The SCT PLL REF will display Data Source Sync and can only be changed by selecting either SCT Internal or TX Terrestrial in this menu
149. fect a small reduction in Eb No can result in total loss of demod and decoder synchronization TPC does not suffer from this problem the demod and decoder remain synchronized down to the point where the output error rate becomes unusable This is considered to be a particularly advantageous characteristic in a fading environment Typically in QPSK 8 PSK and 16 QAM TPC modes the demod and decoder can remain synchronized 2 3 dB below the CEVD R S or TCM cases 4 7 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM Comtech EF Data now offers a very broad range of TPC code rates combined with the entire range of modulation types from BPSK to 16 QAM Table 4 4 1s a listing of all the available TPC modes and rates in the modulator Table 4 4 Available TPC Modes 4 3 3 4 2 End to End Processing Delay In many cases FEC methods that provide increased coding gain do so at the expense of increased processing delay However with TPC this increase in delay is very modest Table 4 5 below shows the processing delays for the major FEC types including three TPC modes Note that in all cases the delay is inversely proportional to data rate so for 128 kbps the delay values would be half of those shown above It can be clearly seen that the concatenated Reed Solomon cases increase the delay very significantly due mainly to interleaving de interleaving Table 4 5 Turbo Product Coding processing delay comparison
150. ge Select IESS 310 mode on or off IESS 310 mode is for 8 PSK 2 3 modulation with Reed Solomon only Press an arrow key to make the selection Press ENTER to execute the change Displays or selects the current N K T and Interleave values for the Reed Solomon FEC The standard code word can only be changed when CUSTOM is the selected modem type in the Utility Menu RX SYMBOL RATE Status Only Displays the current RX Symbol Rate within 9 6 ksym s to 10 Msym s 3 29 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM 3 4 6 3 Utility Interface Menu Specifications usage TX OVERHEAD TYPE Select None IDR IBS VSAT IBS IBS 309 or ASYNC for TX overhead type Note This parameter is only programmable when Custom is selected for modem type in the Utility menu RX OVERHEAD TYPE Select None IDR IBS VSAT IBS IBS 309 or ASYNC for RX overhead type Note This parameter is only programmable when Custom is selected for modem type in the Utility menu TERRESTRIAL Selects data interface to be used J1 RS422 J6 RS422 G 703 Balanced INTERFACE G 703 Unbalanced Note Optional interface only RTS TX IF CNTRL Programs the modem to allow a Request to Send RTS signal to enable the modulator output when data is ready for transmission Press an arrow key to make the selection Press ENTER to execute the change BUFFER PROGRAM Buffer unit program function Select MILLI SECONDS or BITS Press an arrow key to m
151. hange ASYNC CONNECTOR Selects interface connector to use for ASYNC Channel J2 9 pin or J6 50 pin 3 17 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM 3 4 1 4 Local AUPC Menu The Local AUPC menu 15 used to configure the Automatic Uplink Power Control parameters for a Duplex or Simplex Broadcast link This menu will only be displayed if the modem is programmed to a mode that requires AUPC functionality Within the Utility Modem Type menu selection of Modem Types 7650 02 or ASYNC or programming the Local Modem AUPC to ON will activate this display Specifications usage AUPC ENABLE Programs the Automatic Uplink Power Control On or Off On entry the current status is displayed Press an arrow key to make the selection Press ENTER to execute the change NOMINAL POWER Programs the nominal power value of the AUPC The nominal power value can range from 5 to 30 dBm in 0 1 dBm steps On entry the current nominal power value is displayed Press an arrow key to increment or decrement the digit at the flashing cursor Press ENTER to execute the change MINIMUM POWER Programs the minimum power level of the AUPC The minimum power level can range from 5 to 30 dBm in 0 1 dBm steps On entry the current minimum power level is displayed Press an arrow key to increment or decrement the digit at the flashing cursor Press ENTER to execute the change MAXIMUM POWER Programs the maximum pow
152. hange This action initiates the necessary programming by the modem To undo a parameter change prior to execution press CLEAR 3 5 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM 3 3 Digital Data Rate and Symbol Rate The digital data rate is selectable in 1 bit s increments from 9 6 kbps to 20 0 Mbps depending on modulation type code rate and overhead The symbol rate range 1s 9 6 kS s to 10 0 MS s and 15 a limiting factor to data rate See for Table 3 3 details Table 3 3 Data Rate Ranges Operating Mode Modulation Coding FEC Overhead Type Min DR kbps Max DR Mbps 7650 00 CEFD ____ Uncoded 7940 100000 7650 00 CEFD ___ Miterbi __ 7650 00 CEFD QPSK OQPSK1 2 __ 10000 7650 00 CEFD BPSK 1 7 Mterbiand R S 6 455 000 7650 00 CEFD QPSK OQPSK 1 2 VitebiandR S 6 CEFDClsd BPSK214 4 BPSK5l6 eeo 315 ______ 5 21 44 Pc _ 9 54 7650 02 7 BPSK Uncoded 960 848 7650 02 BPSK12 7 jVierbiAsyno 7650 02 Asyno QPSK OQPSK1 2 1 Viterbi Async 960 ___ 7650 02 BPSK1 2 jVitrbiandR S Asyno 90 3 6 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM Operating Mode M
153. he display 3 25 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM 3 4 5 Remote AUPC Menu This menu will only be displayed if the modem is programmed to a mode that allows AUPC functionality Within the Utility Modem Type menu selection of Modem Types 7650 02 or ASYNC will activate this display Note These are extra configuration commands that can modify the distant end modem These configuration or monitor functions can only be accomplished if the modems are locked under the configuration of 7650 02 or ASYNC as a modem type The remote functions may be viewed or changed by entering the Remote AUPC level from the Function select menu on the front panel After entering the Remote AUPC menu press lt to select the Configuration or Monitor menu Enter the selected menu by pressing ENTER Press to view the selected configuration parameters 3 4 5 1 Remote AUPC Configuration Mentem Specifications usage AUPC ENABLE Programs the AUPC enable or On entry the current status of the remote AUPC is displayed Press an arrow key to make the selection Press ENTER to execute the change Note This program is for control or last known status B BAND LOOP BACK Programs the remote baseband loopback On Off On entry the current status of the remote baseband loopback is displayed Press an arrow key to make the selection Press ENTER 10 execute the change Note This program
154. he RX 2047 data test pattern The alarm probably indicates the transmit data is not set to the proper test pattern Verify that the proper differential decoder and descramblers are configured Buffer overflow alarm Buffer overflow is normally a momentary fault Indicates the receive buffer has overflowed The data is being clocked out of the buffer slower than what is being clocked into the buffer from the decoder Verify the system timing Buffer underflow alarm Buffer underflow is normally a momentary fault Indicates the receive buffer has emptied The data is being clocked out of the buffer faster than what is being clocked into the buffer from the decoder Verify the system timing Buffer full alarm Indicates the buffer is lt 10 or gt 90 full RX INSERT Indicates that the Insert demux has a fault D amp I only IBS BACKWARD ALARM IBS Backward Alarm indication FRAME BER Indicates IBS IDR Frame BER has exceeded 1E 3 5 12 SLM 7650 Satellite Modem Revision 4 Maintenance MN SLM7650 IOM 5 2 5 5 Common Equipment Faults Table 5 6 Common Equipment Fault Information Fault Alarm Possible Problem and Action MODULE M amp C Interface section summary fault Typically indicates that the interface module will not program or the M amp C has failed Return the modem for repair BATTERY battery voltage fault Indicates a low voltage in the memory battery Check the modem configurations if the modem was just powered
155. he last parameter returned Parameter Parameter Name Number Command Reference 1 Receive Signal Level ref RSL command Raw BER ref command Corrected BER ref command Interface Read Error Status ref IRES_ command EB NO ref command Buffer Fill Status ref IBFS_ command Frame BER Status ref command Revision 4 51 7650 1 This command is similar to the 5 command but returns modem analog parameters Additional status of new options and features will always be appended to the end Description p1 xsnn n receive signal level in dBm p2 xm mE ee p3 xm mE ee p4 tttt_xm mE ee p5 xnn n EB N0 in dB p6 nn fill status 7 xm mE ee Note Parameters 2 through 7 are dependent on carrier acquisition if the decoder is not locked empty data blocks are returned Bulk Command 5 Consol gt add BCS_p1 p2 p3 pn or lf Status Response 36 This command causes bulk modem status to returned reduce the length of the response message parameter data are returned without identifiers However parameter identification can be determined by order of return Each status parameter is terminated with a comma except for the last parameter which has the standard message termination sequence Most of the data returned is formatted the same way
156. he synchronous scrambler is used in the following applications IDR Small carrier IESS 308 IDR IESS 308 with Reed Solomon IBS 309 Intelsat Business Service IESS 310 SPSK 2 3 with Reed Solomon Comtech CDM 550 framed operation Note Compatibility issues do come up when dealing with scrambling The scramblers may be turned off if the modems are not compatible An IF spectral inversion also can be tried Realize that the output IF signal will not look correct if the scrambler is Off and no data is applied Encoding Decoding Various FEC methods are available in the modem to enable operation in the noisy satellite environment These multiple FEC rates in combination with the various modulation types enables the satellite operator to balance the power and bandwidth availability of each transponder These include convolutional encoding with Viterbi decoding CEVD and Trellis encoding decoding for 8PSK operation and concatenation of these with Reed Solomon outer coding Turbo Product Coding TPC is also available as an option Convolutional Viterbi CEVD The combination of convolutional coding and Viterbi decoding has become an almost universal standard for satellite communications The modem complies with the Intelsat IESS 308 309 standards for Viterbi decoding with a constraint length of seven This is a de facto standard even in a closed network environment which means almost guaranteed inter operability with other manufacturer s equipm
157. his function may be turned ON or OFF by the M amp C The output of the alternate descrambler 15 the final output of the demodulator and is then sent to the baseband interface section Carrier acquisition in the demodulator is a function symbol rate and modulation type Lower data rates and higher modulation types will require a longer acquisition time For very small carrier 25 ksym s there is also the possibility that the demodulator will lock to the wrong carrier if the sweep range encompasses like carriers within the sweep range The demodulator has available functionality that can shorten the acquisition time These are Sweep Range Sweep Center Frequency and Reacquisition 4 16 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 4 3 4 4 3 1 4 4 3 2 The Sweep Range sets limits of the carrier loop during acquisition The Sweep Center Frequency function allows the operator to target the demod center frequency to be offset from the assigned demodulator center frequency The Reacquisition function 15 used to reduce the amount of time that 15 required to relock the demod in the event of a short outage or fade For the time specified in the Reacquisition function the demodulator will reduce the sweep range of the carrier loop to 500 Hz from the demodulator center frequency prior to the outage Baseband Interface The baseband section of the modem consists of the Monitor and Control M amp C the transmi
158. ically indicates that terrestrial data stream is not synchronized D amp I only FRAME BER Fault if Frame BER exceeds 1E 3 option card PL 10175 2 only 3 23 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM 3 4 3 5 Common Equipment Faults Fa Cause not program or the M amp C has failed 2 5V SUPPLY 2 5V power supply fault 1 8V SUPPLY 1 8V power supply fault TEMPERATURE Over Under Temperature Fault Indicates that the internal temperature of the modem has exceeded 75 C or is below 10 C MODEM REF ACT Activity detector alarm at the input of the selected source for the Modem Reference Indicates that a signal is not being detected at the Modem Reference connector CP3 The Modem Reference will fall back to the internal reference if this fault is active MODEM REF PLL Reference Phase Lock loop is Not Locked 3 4 3 6 IDR Backward Alarms Note Only available with IDR selected and with IDR ESC 3 24 SLM 7650 Satellite Modem Revision 4 Operation 3 4 4 MN SLM7650 IOM Stored Faults Alarms Menu The Stored Faults Alarms level 15 accessible from the Function Select menu The modem stores the first 10 through occurrences of fault status changes in each of the following major fault categories Modulator Demodulator Transmit Interface Receive Interface Common Equipment Each fault status change is stored with the time and date of the occurrence 1 e when a fault occur
159. in steps of 2 dB Parameter 37 Insert Data Format ref IDF command 24 CAS 5 S p E1CAS ME cc n command P38 dd cc dd cc dd cc dd cc as defined by the BICA command 39 IDR Backward Alarm RX1 ref BW_RX1_ command P39 where n is 0 OFF or 1 ON 40 IDR Backward Alarm RX2 ref RX2 command P40 n where n is 0 OFF or 1 ON Parameter 41 IDR Backward Alarm ref BW_RX3_ command P41 n where n is 0 OFF or 1 ON P42 n where is 0 OFF or 1 ON Parameter 43 IDR Receive ESC Type ref command P43 0 where n is 0 2x32Kbit s Audio or 1 64Kbit s Data 13 SLM 7650 Satellite Modem Remote Control Specifications A 10 Interface Transmit Overhead Type Interface Receive Overhead Type Transmit Clock SCT PLL Reference External Clock Reference Frequency Transmit Clock Phase Buffer Clock Receive Clock Phase Baseband Loopback Interface Configuration Commands Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response
160. ise Source Data Ext Ref Fireberd 6000 22 Data External Reference SLM 7650 Frequency Modulator Figure 5 5 Modem Verification Test Setup 5 14 SLM 7650 Satellite Modem Revision 4 Maintenance 5 3 1 5 3 1 1 5 3 1 2 MN SLM7650 IOM Modulator Tests The tests listed will give reasonable assurance that the modulator section is performing to specification The test equipment used in these test is listed in Table 5 7 Spectral Shape of the IF Output ie In the Utility Modem Type menu configure the modem for modem type 7650 00 In the Configuration Modulator menu turn the modulator TX IF Output ON Connect the modulator output to a Spectrum Analyzer Set Spectrum Analyzer to a center frequency of 70MHz frequency span of 100 KHz and resolution bandwidth to 3 kHz Set reference level to see modulated spectrum on the spectrum analyzer screen Verify that the output spectral density mask meets MIL STD 188 165 Section 5 1 6 4 1 and its associated Figure 4 Carrier Null 1 YS T Continue from the previous step and m the Configuration Modulator menu set the Carrier Mode to DUAL Figure 5 6 the Spectrum Analyzer verify that the center carrier null is greater than 35 dB Change Carrier Mode to OFFSET Figure 5 7 On Spectrum Analyzer verify that the offset carrier null is greater than 30 dB Set the Carrier Mode to Normal Modulated Turn the TX IF Output ON
161. le 2 7 Asynchronous Data Interface Asynchronous Interface 9 Pin D Female DCE EIA 485 4 Wire EIA 485 2 Wire EIA 232 Signal Name Signal Name 1 3 7 Signal Name I a 1 GND 1 GND 1111 12 RD 2 4 1 mM 2 e 21 8 __ 10 9 TX RX VO 2 2 2 7 Faults Status Table 2 8 Fault Alarm Status Interface 1 COM O 43 COM 6 RECEIVEISFAULTED 8 NO TRANSMTISOK 9 NC TRANSMITISFAULTED SLM 7650 Satellite Modem Rev 3 Installation MN SLM7650 IOM 2 2 2 8 G 703 Overhead Option Card Connections 2 2 2 8 1 50 Pin Interface Connector Table 2 9 50 Pin Sub D Female Interface Connector pns X AsvNc Nemma O O AGC O AGC O AGC O AGC O RDA G 703 O RDA G 703 O RDA G 703 O G 703 TXDA 422 8k 1 SD A 422 SD A EIA422 1 TXDB EIA422 1 DDO B G 703 O 1 I TT A EIA422 1 TT A EIA422 1 EMI EIA422 I EIA422 1 21 TXC AEIA4226k O 5 422 0 422 0 22 TXC B ElA4226k O STrBElA422 O 4220 6480 RTS AEIAG22 1 RISAEA420 29 64SDB RTIS BEIA422 RISrBEA420 47 Aud2 Ain 64STA O CTS AEIMZ2 O CTS AEMMZ2 0 97 AudZBin 648TB O CTS BEIA
162. lite Modem Revision 4 Operation MN SLM7650 IOM 3 5 9 Custom Operation The CUSTOM mode of operation allows access to all front panels menus including the Utility menus When selecting this mode of operation the modem does not change the settings when from the previous operating mode All currently programmed parameters will remain as they were The CUSTOM operation mode is used when the modem must function in a non standard operating mode For example to use the modem in an IBS closed network application per IESS 309 the following steps are taken 1 Select the IBS modem type so that the modem loads the IBS default parameter 2 Select the Custom modem type which allows Access to the Tx and Rx overhead type 3 Select NONE for the Tx and Rx overhead types Use caution when operating in the Custom mode This mode accepts all modem settings including incompatible parameters Users should become familiar with the procedures prior to operating the modem 3 49 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM This page 15 intentionally left blank 3 50 4 1 4 2 Chapter 4 OF OPERATION This chapter describes theory of operation for the SLM 7650 Overview The SLM 7650 is a duplex modem in a 1 RU chassis The modem consists of three basic sub sections The modulator section the demodulator section and the baseband interface and monitor and control section The modem operates on 110 22
163. lled and RX overhead is DI Data is only returned when the option card is installed and TX overhead is DI Data is only returned when the option card is installed Data is only returned when the option card is installed and TX or RX Overhead is ASYNC Data is only returned when the option card is installed and TX or RX Overhead is DI 30 SLM 7650 Satellite Modem Remote Control Specifications A 16 Fault Status MODEM Command add MFS Faults Response gt add MFS_ cr Status Summary ITX xxx cr IRX xxx cr CEQ xxx BWAL xxx cr If Modulator Command add MS cr Status Response gt add MS_ cr SYN DCS ICH SFLT xx cr If Command add DS cr Response gt add DS_ cr CD SYN ICH SFLT Interface Command add ITXS Transmit Response gt 5 Side Status MOD xxx cr TXD xxx cr TXCPLL PLL xxx cr SCT xxx cr DRP xxx cr SFLT xx cr If Interface Command add IRXS Receive Response 2add IRXS Side Status MOD xxx cr PLL xxx cr xxx cr RXD xxx cr DMUX 2047 xxx cr OVFL UNFL BUFF INS xxx cr BWA xxx cr FBER SFLT xx cr If 31
164. lock is sourced from the overhead card Data transitions occur on the falling edge of the clock The clock period will be 1 480 of the receive terrestrial data rate and have a duty cycle of approximately 50 4 21 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 4 3 2 1 8 IDR Overhead ESC The interface option card provides access to the IDR engineering service channels at the 50 pin connector IDR ESC requirements are defined within IESS 308 and 1 55 403 ESC 64 kbps Data Replaces 32 kbps audio channels when enabled Interface type EIA422 ESC TX data is sampled on the rising edge of the ESC TX clock sourced from the overhead card The ESC TX clock will have a period of 64 kHz and a duty cycle of approximately 50 ESC RX data and clock is sourced from the overhead card Data transitions occur on the falling edge of the clock The clock period will be 64 kHz and have a duty cycle of approximately 50 ESC TX data is sampled on the rising edge of the ESC TX clock sourced from the overhead card The ESC TX clock will have a period of 8 kHz and a duty cycle of approximately 50 In addition the transmit interface provides an octet signal at 1 KHz for byte alignment purposes ESC RX data and clock is sourced from the overhead card Data transitions occur on the falling edge of the clock The clock period will be 8 KHz and have a duty cycle of approximately 50 In addition the receive interface provides an oc
165. mer The remedies provided herein are the buyer s sole and exclusive remedies Comtech EF Data shall not be liable for any direct indirect special incidental or consequential damages whether based on contract tort or any other legal theory Comtech EF Data has reviewed this manual thoroughly in order that it will be an easy to use guide to your equipment All statements technical information and recommendations in this manual and in any guides or related documents are believed reliable but the accuracy and completeness thereof are not guaranteed or warranted and they are not intended to be nor should they be understood to be representations or warranties concerning the products described Further Comtech EF Data reserves the right to make changes in the specifications of the products described in this manual at any time without notice and without obligation to notify any person of such changes If there are any questions regarding your equipment or the information in this manual please contact the Comtech EF Data Customer Support Department xil 1 1 Chapter 1 INTRODUCTION This chapter provides an overview of the SLM 7650 satellite modem referred to In this manual as the modem Overview The SLM 7650 Figure 1 1 Interfaces between terrestrial fixed rate data terminal equipment with data rates between 9 6 kbps and 20 Mbps and RF converter equipment that interfaces at 50 to 90 MHz and 100 to 180 MHz on the I
166. meters Table 3 5 7650 02 Default Parameters Table 3 6 IDR Default Parameters Table 3 7 IBS Default Parameters Table 3 8 VSAT IBS Default Parameters Table 3 9 IBS 309 Default Parameters Table 3 10 ASYNC AUPC Default Parameters Table 3 11 EFD Default Parameters Table 4 1 Viterbi Decoding Summary Table 4 2 Concatenated RS Coding Summary Table 4 3 SPSK TCM Coding Summary Table 4 4 Available TPC Modss Table 4 5 Turbo Product Coding processing delay comparison Table 4 6 Reed Solomon Factor Table 4 7 Delay Variations for Inclined Orbit Satellites Table 4 8 Recommended Buffer S1Z6 Table 5 1 SLM 7650 Fault Tree Table 5 2 Modulator Fault Information Table 5 3 Demodulator Fault Information Table 5 4 Transmit Interface Fault Informatio
167. n Table 5 5 Receive Interface Fault Information Table 5 6 Common Equipment Fault Information Table 5 7 Test Equipment Table 5 8 Conversion to S N and Ep No Chart Table 5 9 Reed Solomon Overhead Correction Factor vill Revision 4 MN SLM7650 IOM SLM 7650 Satellite Modem Preface About this Manual Revision 4 MN SLM7650 IOM This manual describes the Installation and operation for the Comtech EF Data SLM 7650 Satellite Modem This is a technical document intended for earth station engineers technicians and operators responsible for the operation and maintenance of the SLM 7650 Related Documents Standards Military MIL STD 188 165 MIL STD 810F MIL STD 1686C Standards Federal FED STD 313 Standards General EIA 422 EIA 485 EIA TIA 530 IESS 308 IESS 309 IESS 310 ANSI J STD 001A ANSI VITA 3 1995 ISO 9001 Interoperability and Performance Standards for SHF Communications PSK Modems FDMA Operation Environmental Test Method and Engineering Guidelines Electrostatic Discharge Control Program for Protection of Electrical and Electronic Parts Assemblies and Equipment Excluding Electrically Initiates Explosive Devices Metric Material Safety Data Transportation Data and Disposal Data for Hazardous Materials F
168. n has not been compromised since the modem has been constantly powered up Faults Alarms System faults are reported in the Faults Alarms menu and stored faults are reported in the Stored Flts Alms menu To determine the appropriate action for repairing the modem refer to Table 5 1 and the list of possible problems 5 4 Revision 4 MN SLM7650 IOM SLM 7650 Satellite Modem Maintenance Table 5 1 SLM 7650 Fault Tree ewawiawvassas Wwavivauvmnovasal bel L xxix LL wav moviaa aatiinvaxel avay waww xa qina amie EN ENS ao1naino ana lt lt x x lt x gt V gt 5 8 S 3 gt lt c Z 5 5 Z E N 9 D N 5 S x Dlo 9 51 G lt 1 lt gt 5 2 1 3
169. n the modem To change the ASYNC overhead baud rate 110 to 38400 bps press ENTER Press lt gt to position the cursor over the baud rate parameter Press T or to select one of the following baud rates bps 110 150 300 600 1200 2400 4800 9600 19200 38400 Once the desired baud rate is displayed press ENTER to set the baud rate To change the ASYNC overhead interface format of the modem is displayed press ENTER Press lt or gt to position the cursor over the interface format parameter Press 1 or 4 to scroll through the available interface formats Once the desired format is displayed press ENTER to set the baud rate The number of data bits parity and stop bits is selectable Available formats are 7 data bits Even parity and 1 stop bits 7E1 7 data bits Odd parity and 1 stop bits 701 7 data bits No parity and 1 stop bit 7N1 7 data bits Even parity and 2 stop bits 722 7 data bits Odd parity and 2 stop bits 702 7 data bits No parity and 2 stop bit 7N2 8 data bits Even parity and 1 stop bits 8E1 8 data bits Odd parity and 1 stop bits 801 8 data bits No parity and 1 stop bit 8N1 8 data bits Even parity and 2 stop bits 8E2 8 data bits Odd parity and 2 stop bits 8O2 8 data bits or No parity and 2 stop bit 8N2 ASYNC RX Programs the baud rate settings and interface format of RX ASYNC overhead in the modem To change the RX ASYNC overhead baud
170. nal computer with USB capability is used for the flash upgrade The typical upgrade will be provided on a CD ROM The CD ROM will contain a single executable ZIP file that contains all the files and the program needed to upgrade the modem The operator will copy the ZIP file to the desired directory and run the executable file The required files will be copied to the user hard drive 5 1 SLM 7650 Satellite Modem Revision 4 Maintenance MN SLM7650 IOM The following is a basic overview of the steps involved in an upgrade This is not intended to be the complete procedure Refer to the procedure provided with the upgrade for the complete and detailed instructions Run the Reflash program Figure 5 1 Enable the USB Reflash in the Utility System menu Connect the USB cable to the USB port on the front panel of the modem The modem will go into Reflash mode Select the new upgrade file Upload the Application When the upgrade is complete remove the USB cable The modem will re boot and configure to the default parameters ioj Operation Factory Help Application Retlash File Modem ccc Browse Create ccc g RRRARRRRRARARRRRARERRARERRRRARRRARRRRRARARRRRARERRARERRRRARRERE Verify as SLM 7650 Moder Application Upload USB Status 7 Informatio Humber of USE Devices Detected USE Active Diver Version Mot Available AFI Version Mat Available Refresh Vendor ID Available
171. nce Revision 4 MN SLM7650 IOM 5 2 5 4 Receive Interface Faults Table 5 5 Receive Interface Fault Information Fault Alarm Possible Problem and Action MODULE BUFFER CLK PLL BUFFER CLK ACT RX DATA AIS DEMUX LOCK or R S FEC LOCK RX 2047 LOCK BUFFER OVERFLOW BUFFER UNDERFLOW BUFFER FULL RX Interface section fault Typically indicates that the RX Interface will not program Return the modem for repair Buffer clock phase locked loop fault The buffer synthesizer is the wrong frequency or will not lock Ensure the selected buffer clock source is at the proper frequency and level Activity detector alarm of the selected clock source for the receive buffer The interface will fall back to the internal clock when this fault is active Verify that the proper signal is present at the desired clock input Receive Data or AIS alarm UTILITY INTERFACE RX DATA FAULT AIS Will indicate a fault condition if the recovered satellite data is all 1s UTILITY INTERFACE RX DATA FAULT DATA Will indicate a fault condition if the recovered satellite data is all 1s or all Os This is referred to as a data stable condition data is not transitioning Overhead demux or R S framing lock fault Indicates that the overhead framing or the R S FEC framing is not locked to the recovered frame from the satellite Verify that the proper overhead frame is configured RX 2047 lock alarm Indicates the decoder is not receiving t
172. nd add CES cr gt 5 cr M amp C BAT 12V 12 xxx cr 45 43 3 xxx cr 2 5V 1 8 xxx cr TEMP xxx cr PLL xxx cr ACT SFLT xx cr If add IAS 2add IAS TXBWAT1 xxx cr TXBWA2 xxx cr xxx cr TXBWAA xxx cr 1 xxx cr 2 xxx cr RXBWAA xxx cr SFLT xx cr If A 32 Revision 4 MN SLM7650 IOM Controller Module OK FLT Battery Clock OK FLT 12 Volt Level OK FLT 12 Volt Level OK FLT 5 Volt Level OK FLT 3 3 Volt Level OK FLT 2 5 Volt Level OK FLT 1 8 Volt Level OK FLT Temperature OK FLT Modem Reference PLL OK FLT Modem Reference Activity OK FLT Number of stored faults logged 0 to 10 The common equipment status command causes a block of data to be returned which indicates the status of the common equipment TX Backward Alarm 1 OK FLT TX Backward Alarm 2 OK FLT TX Backward Alarm 3 OK FLT TX Backward Alarm 4 OK FLT RX Backward Alarm 1 OK FLT RX Backward Alarm 2 OK FLT RX Backward Alarm 3 OK FLT RX Backward Alarm 4 OK FLT Number of stored faults logged 0 to 10 SLM 7650 Satellite Modem Revision 4 Remote Control Specifications MN SLM7650 IOM A 17 General Status Performance Raw BER Command add RBER Where Response gt add RBER_xm mE ee cr lf x lt or gt data to indicate that
173. nitor functions as they display the current fault status of the group being displayed Press lt or gt to move between the following Fault Alarm groups Modulator Demodulator Transmit Interface Receive Interface Common Equipment Backward Alarms IDR ESC only The current Faults Alarms status is displayed on line 2 of the display in real time For each parameter monitored fault status 15 displayed as one of the following Indicates that no fault or alarm exists 47 Indicates that a fault exists and will cause switching in a redundant system Reversed contrast indicates an active alarm Alarms do not cause switching to occur To display labels for individual faults or alarms press ENTER Press to move the flashing cursor to make the selection The label for that Fault Alarm is then displayed on line 1 of the display Press CLEAR to exit this level of operation and return to the previous level 3 21 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM 3 4 3 1 Modulator Faults Menem Specifications usage MODULE Modulator section fault Typically indicates that the modulator section will not program IF SYNTHESIZER Modulator IF synthesizer fault 3 4 3 2 Demodulator Faults MODULE Demodulator decoder section fault Typically indicates that the Demod decoder section will not program CARRIER DETECT Carrier dete
174. ns usage and year and year and year DISPLAY BRIGHTNESS Sets the brightness setting of the front panel menu Press ENTER to begin Press 1 or V to increment or decrement the number at the flashing cursor from 25 to 100 Press ENTER to execute the change EXT AGC MIN PWR Sets the AGC voltage for receive signal level of 60 0 dBm EXT AGC MAX PWR Sets the AGC voltage for receive signal level of 15 0 dBm USB REFLASH Configures the modem for upgrade via the USB connector on the front panel MASTER RESET Master reset function Initiating a hard reset will reset the modem and set the default configuration settings Initiating a soft reset will reset the modem hardware but saves the current configuration settings Select ENTER once to access HARD or SOFT Press lt gt to make the selection Press ENTER Select Yes or No and press ENTER again Note The following system settings will not revert to the default values upon a hard reset Remote Format Remote Address Remote Baud Rate 3 32 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM 3 4 6 5 Utility Modem Type Menu Menu tem Specifications usage MODEM TYPE Selects the following types of modem operation 7650 00 7650 02 IDR IBS VSAT IBS IBS 309 EFD ASYNC CUSTOM When the modem is changed from one mode of operation to another the modem will be reset to the default configurations of the new modem type Note that the RF
175. nse 2add BCSF abcdefghijklmnopq cr If dated Status Faults 44 Revision 4 MN SLM7650 IOM This command causes all modem fault status to be returned To reduce the length of the response fault status is embedded into the bit structure of the characters that are returned Faults are indicated by a binary 1 in the designated bit position Character Modulator fault status character 1 Bit 6 1 always Bit 5 Modulator module fault Bit 4 RF output status actual not programmed status 1 on 0 off Bit 3 through Bit 0 Binary representation 0 to 10 of the number of modulator stored faults Character b Modulator fault status character 2 Bit 6 1 always Bit 5 IF Synthesizer Bit 4 reserved Bit 5 Data Clock Synthesizer Bit 2 Channel Bit 1 Q Channel Bit 0 AGC Level Character c Modulator fault status character 3 Bit 6 1 always Bit 5 reserved Bit 4 reserved Bit 3 reserved Bit 2 reserved Bit 1 reserved Bit 0 reserved Character d Demodulator fault status character 1 Bit 6 1 always Bit 5 Demod module fault Bit 4 Carrier detect status 0 for decoder lock Bit 3 through Bit 0 Binary representation 0 to 10 of the number of demodulator stored faults Character Demodulator fault status character 2 Bit 6 1 always Bit 5 IF Synthesizer Lock Bit 4 reserved Bit 3 Channel Bit 2 Q Channel Bit 1 reserved Bit 0 BER thresh
176. odem Figure 4 7 User Provides Data Only SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 4 3 3 3 Internal Clock The Internal clock of the modem is referred to as Send Timing ST This clock 15 available as an output clock from the modem It can use as a clock source for the data equipment if the user wants to clock the data equipment from the modem The user equipment will output the send data and transmit terrestrial clock by slaving to the modem ST clock The internal ST clock 15 also the fallback clock for all conditions where the selected clock source is removed The frequency standard of this clock 15 typically tied to that of the modem reference However the modem offers flexibility in the selection of the timing source for the internal ST clock The SCT PLL REF 15 the internal ST clock Phase Lock Loop Reference source The choices for this reference are Modem Reference External Master Clock Rx Satellite or Data Source Sync Figure 4 8 The Modem Reference has a number of choices The default is Internal that selects the high stability oscillator on the monitor and control card The other choices have to do with accepting either 1 5 10 or 20 MHz from the user site clock Figure 4 8 is a sketch of these clock choices relating to the internal SCT clock of the modem SCT PLL REF MODEM REFERENCE INTERNAL e MODEM REF FEE ud 1 MHz Internal ST EXT MASTER CL
177. odulation Coding FEC Overhead Type Min DR kbps Max DR 7650 02 OPSK OGPSK12 j 8 ib i as VebiiDR 18 aska VVebilDR 1544 Joeskiz VVebiibR 2048 IDR loPsksa VebilbR 2048 480 4 2 Viterbi IDR 6312 amp 8448 6312 00 5 Viterbi IDR 6312 amp 8448 6312 00 1 2 Viterbi and R S IDR 1544 1544 00 4 Viterbi and R S IDR 1544 1544 00 5 4 2 Viterbi and R S IDR 2048 2048 00 5 3 4 Viterbi and 5 IDR 2048 2048 00 QPSK 1 2 Viterbi and R S IDR 6312 amp 6312 00 8448 ics 3 4 Viterbi and R S IDR 6312 amp 6312 00 8448 VSAT IBS QPSK 1 2 Viterbi and R S 64 00 VSAT IBS QPSK 3 4 Viterbi and R S 64 00 VSAT IBS IESS310 ON 8 5 2 3 Trellis and R S 64 00 3 7 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM 3 4 Menus 3 4 1 Configuration Menu 3 4 1 1 Modulator Menu TX DR Filter A B C D or V Data Rate Code Rate and Modulation Type Data rates are referenced in Paragraph 3 3 On entry the current transmitter rate is displayed with the flashing cursor on the first character of the code rate on line 1 Line 2 displays the data rate Press lt gt to make the selection To select the currently defined variable data rate
178. old Character Demodulator fault status character 3 Bit 6 1 always Bit 5 reserved Bit 4 reserved Bit 3 reserved Bit 2 reserved Bit 1 reserved Bit 0 reserved Character g Interface transmit side faults character 1 Bit 6 1 always Bit 5 TX Interface Module Bit 4 reserved Bit 3 through Bit 0 Binary representation 0 to 10 of the number of interface transmit side stored faults Character h Interface transmit side faults character 2 Bit 6 1 always Bit 5 Transmit Data AIS SLM 7650 Satellite Modem Revision 4 Remote Control Specifications MN SLM7650 IOM Bit 4 Selected Transmit Clock Activity Bit 3 SCT Synthesizer PLL Lock Bit 2 SCT Reference Clock Activity Bit 1 Transmit Clock PLL Fault Bit 0 drop fault Character Interface transmit side faults character 3 Bit 6 1 always Bit 5 reserved Bit 4 reserved Bit 3 reserved Bit 2 reserved Bit 1 reserved Bit 0 reserved Character Interface receive side faults character 1 Bit 6 1 always Bit 5 RX Interface Module Bit 4 reserved Bit 3 through Bit 0 Binary representation 0 to 10 of the number of interface receive side stored faults Character k Interface receive side faults character 2 Bit 6 1 always Bit 5 Buffer clock PLL lock Bit 4 Buffer clock activity Bit 3 Receive Data Loss AIS Bit 2 Demux lock Bit 1 RX 2047 Pattern lock Bit 0 reserved Character
179. ontainer and cause damage to the modem To remove the modem 1 Cut the tape at the top of the carton indicated by OPEN THIS END Remove the cardboard foam space covering the modem Remove the modem manual and power cord from the carton Inspect the equipment for any possible damage incurred during shipment 2 3 4 Save the packing material for storage or reshipment purposes 5 6 Check the equipment against the packing list to ensure the shipment is correct 7 Refer to Section 2 2 for installation instructions SLM 7650 Satellite Modem Rev 3 Installation MN SLM7650 IOM 2 2 Installation 2 2 1 Installation Procedure Install the SLM 7650 into the equipment rack as follows 1 Carefully lift the modem into the selected position In the equipment rack Refer Figure 1 2 for unit dimensional envelope 2 Connect the cables to the proper locations on the rear panel Notes 1 allow proper cooling of the unit the modem shall be positioned In a manner to allow an uninterrupted airflow around the unit including no blockages in front of the fan assembly 2 Ifthere is any problem with the installation contact Comtech EF Data s Customer Support Department 2 2 2 External Modem Connections Optional G 703 Card i ss E gem i gt V 1 d D AU ny Figure 2 1 Rear Panel 2 2 2 1 Power Entry Table 2 1 Modem Rear Panel Connectors AC Option Input Power 60W maximum 50W typical
180. ould be linear between the maximum and minimum power settings with respect to the receive signal level The voltage output limits at the programmed min max voltages for out of range receive signal levels 4 20 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 4 3 2 1 7 IBS Overhead ESC The interface option card provides access to the IBS engineering service channels at the 50 pin connector IBS ESC requirements are defined within IESS 309 and IESS 403 IBS Octet Signaling Provides support for octet byte alignment signaling for the primary data channel The octet signal is active for one clock period framing bit 0 of an 8 bit data sequence The receive side octet signal is provided as an output every eighth bit The transmit side octet signal is an input that is used to synchronize the octet to the IBS multi frame IBS Backward Alarm IESS 309 compatible Prompt Alarm Indication Form C Relay contacts accessible through the 50 pin connector Service Alarm Indication Form C Relay contacts accessible through the 50 pin connector ESC Data Channel EIA 232 interface accessible through the 50 pin connector Refer to IESS 309 and IESS 403 ESC TX Data Channel ESC TX data is sampled on the rising edge of the ESC TX clock sourced from the overhead card The ESC TX clock will have a period of 1 480 of the transmit terrestrial data rate and a duty cycle of approximately 50 ESC RX Data Channel ESC RX data and c
181. overall travel of the sweep width range during acquisition in the directed sweep mode The sweep width may be set from 0 to 70000 Hz When set at 70000 Hz the modem is in the normal acquisition mode Keep the sweep range narrow for low data rates On entry the current programmed setting is displayed Press lt gt to move the flashing cursor Press 1 4 to increment or decrement the digit at the flashing cursor Press ENTER to execute the change The smaller the range the faster the modem will lock provided the receive carrier center frequency is within the RX IF frequency sweep range SWEEP REACQUISITION Programs the sweep reacquisition mode time duration This is the time that the modem will remain in a narrow sweep of the selected range 500 Hz after loss of acquisition After this timer runs out the modem will return to the normal acquisition sweep The reacquisition time is to 999 seconds On entry the current programmed setting is displayed with a flashing cursor on the first character Press lt or gt to move the flashing cursor Press 1 or to increment or decrement the digit at the flashing cursor Select the number of seconds desired for the reacquisition mode Press ENTER to execute the change RS DECODER Programs the Reed Solomon decoder On Correction Off or Off ON Enables the Reed Solomon decoder to provide data error corrections Correction OFF is a Test Mode CORRECTION OFF Turns of
182. pecifications Demodulator Scrambler Type Descrambler Enable Differential Decoder Enable IF Loopback Sweep Center Frequency Sweep Width Range Sweep Reacquisition Bit Error Rate Threshold Demodulator Type Demodulator Decoder Type Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response add DCRT xxxx cr 2add DCRT xxxx cr If add DCRT cr 2add DCRT xxxx cr If add DE xxx cr add DE xxx cr If add DE cr add DE xxx cr If add DDEC add DDEC xxx cr If add DDEC cr add DDEC xxx cr If add IFL xxx cr gt add IFL_xxx cr lf add IFL gt add IFL_xxx cr If lt add SCF_snnnnn cr gt add SCF_snnnnn cr lf add SCF cr add SCF snnnnn cr If add SWR nnnnn cr add SWR 1 add SWR gt add SWR_nnnnn cr If add SR xxx cr add SR xxx cr If add SR cr add SR xxx cr If add BERT xxxx cr gt _ 1 add BERT gt add BERT_xxxx cr lf add DT gt xxxx cr lf
183. quarter of the symbol rate from the carrier This is used to check the quadrature On entry the Center mode is displayed To activate this test mode press ENTER Press an arrow key to select the desired mode To return to the Configuration menu press CLEAR RS ENCODER Programs the Reed Solomon encoder On or Off On entry the current status of the Reed Solomon encoder is displayed Press an arrow key to make the selection Press ENTER to execute the change Notes 1 Programming the Reed Solomon encoder automatically turns off the RF transmitter 2 double beep will occur when attempting to turn on Reed Solomon if the data rate and overhead type are invalid 3 9 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM 3 4 1 2 Demodulator Menu Specifications usage RX DR Filter A B C D or V Data Rate Code Rate and Modulation Type Data rates are referenced in paragraph 3 3 On entry the current receiver rate is displayed with the flashing cursor on the first character of the code rate on line 1 The data rate is displayed on line 2 Press an arrow key to select one of four pre defined rate A B C or D To select the currently defined variable data rate select RX V and press ENTER twice To change the rate using the variable rate selection press ENTER when RX V is displayed A flashing cursor is displayed on the first character of the coding type on line 1 Press lt
184. r IDR TI 1 IDR 2 IDR 2 4 8 8 4 4 4 4 4 4 4 4 12 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 4 Theory of Operation 4 4 1 Modulator The modulator converts the input data and clock to a modulated Intermediate Frequency IF output in the frequency range of 70 20 MHz or 140 40 MHz The modulator is controlled by commands from the M amp C Interface CCA and fault information from the modulator is sent to the M amp C Interface The modulator is composed of eight basic subsections The major modulator subsections are Scrambler Differential Encoder Convolutional Encoder Programmable Vector Rotation Nyquist Filters Modulator IF Synthesizer Output Amplifier Output Level Control The data from the baseband interface section is first processed through the scrambler for energy dispersal and then to the differential encoder The differential encodes the data in a way that the demodulator will be able to resolve the various ambiguities that result from the different modulation types After the differential encoder the data 15 passed to the FEC encoding section If Reed Solomon outer coding 15 selected the data will be processed first by the R S encoder before being passed to the convolutional or trellis encoder The available convolutional code rates are 1 2 3 4 and 7 8 and the trellis code rates are 5 6 and 2 3 are based on the symbol rate range of 9 6 kbit s
185. rease or decrease the output power level in 0 1 dBm steps Press ENTER to execute the change SCRAMBLER TYPE Programs the scrambler IESS OM73 or TURBO On entry the current status of the scrambler is displayed Press an arrow key to make the selection Press ENTER to execute the change 3 8 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM SCRAMBLER Programs the scrambler On or Off On entry the current status of the scrambler is displayed Press an arrow key to make the selection Press ENTER to execute the change DIFF ENCODER Programs the differential encoder On or Off On entry the current status of the differential encoder is displayed Press an arrow key to make the selection Press ENTER to execute the change CARRIER MODE Programs the modem for continuous wave mode Four modes of operation are available Test Mode Configuration Normal Off The Carrier mode is normally in the OFF position To execute any of the Carrier continuous wave modes enter the Carrier mode and select the test mode of choice Center Generates a carrier at the current modulator frequency This can be used to measure the output frequency Dual Generates a dual side band suppressed carrier signal Side bands at one half of the symbol rate from the carrier This is used to check the channel balance and carrier null Offset Generates a single upper side band suppressed carrier signal The upper side band is at one
186. requency stability of the IF signal will match the stability of the modem reference The signal is sent to the output amplifier The amplifier takes the low level signal from the modulator section and amplifies the signal to the proper level for output from the module The amplifier circuitry provides programmable control of the output level over a range of 5 to 30 dB in 0 1 dB steps The amplifier has power leveling of 0 5 dB to maintain the stability of the output level over time and temperature Demodulator The demodulator will provide baseband data and clock to the customer by processing the down converted RF signal from the satellite The frequency of the input IF signal for the demodulator is 70 20 MHz or 140 40 MHz The input level is between 15 dBm and 55 dBm The demodulator uses Viterbi or trellis decoding with or without concatenated Reed Solomon decoding optional Turbo Product Code A large receive buffer is available to compensate for any frequency changes caused by the satellite link The demodulator functions as an advanced digital coherent phase lock receiver with selectable FEC decoders The demodulator is controlled by commands from the M amp C and fault information from the demodulator is sent to the M amp C The demodulator is composed of eight basic subsections The major demodulator subsections are Input Amplifier Input AGC IF Synthesizer Demodulator Nyquist Filters FEC Decoding Descrambler Diff
187. res the modem for remote operation Response 2add REM cr If 51 7650 will respond to any status request at any time However the SLM7650 must be in Remote to change configuration parameters Clear Stored Command lt add CLSF_ cr This command is used to clear all stored faults logged by Faults Response 5 cr If the SLM7650 Modem Command add MRC Where xxxxx INT INTERNAL EXT1 EXTERNAL 1 Reference Response gt MHz 5 EXTERNAL 5 MHz EXTERNAL 10 Clock MHz EXTERNAL 20 MHz Status add MRC Response gt 11 add MOM xxxxxxx cr Where ONLY RX ONLY DUPLEX mode Operation Response gt add MOM_ xxxxxxx cr f Mode This command configures the modem for simplex duplex or Status lt add MOM standby operation modes When transmit only mode is Response gt 9 11 selected receive faults are inhibited and when receive only mode is selected transmit faults are inhibited System Command lt add SMT_ xxxxxx cr Where IDR IBS DI ASYNC EFD CUSTOM Modem Type Response gt add SMT_ xxxxxx cr IBS 309 VSAT IBS 7650 00 or 7650 02 RF OFF cr If Status add SMT Response 2add SMT xxxxxx cr If Save Modem Command add SMC Where n 7 1 2 3 4 or 5 stored configuration
188. rical interface 1s selectable TIA EIA 232 or TIA EIA 485 2 or 4 wire Intelsat specifies an overhead framing structure for every open network carrier The specifications from Intelsat are IESS 308 IESS 309 and IESS 310 The modem can be configured to provide IDR and IBS framing of the data stream per the Intelsat specifications The type of overhead framing over Intelsat is dependent on the data rate modulation type and service that are in operation Refer to the IESS documents for complete details on these operating modes and framing format SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 4 3 2 1 The IESS documents define the content of the bits within the overhead frame commonly referred to as Engineering Service Channel ESC data The modem does not provide access to ESC data but sets all of the bits In a non Inserted state so there 15 no problem Interfacing into an open network earth station An optional mterface card 15 avallable to provide the Interface to the IESS defined ESC data The modem is able to provide a bit error rate 1f the demodulator receives 2047 pattern and the demodulator test mode of 2047 is turned ON The modulator is also capable of substituting the 2047 test pattern in lieu of the incoming data stream The 2047 test pattern is a standard test pattern compatible with the FIREBERD 6000 and similar commercial BER testers In additional to the 2047 test pattern a special MIL test pattern
189. ructures are NONE and G704 4 Valid E2 frame structures are NONE G704 G742 and G745 Where xxxxxx 2047 MIL188 or OFF Note Transmit 2047 or MIL 188 Pattern Where xxxxxx 2047 MIL188 or OFF Note Receive 2047 or MIL188 Pattern SLM 7650 Satellite Modem Remote Control Specifications Transmit Data Fault Receive Data Fault Transmit Data Phase Receive Data Phase RTS TX IF Control Mode Interface Coding Format Transmit Interface Coding Format Receive Interface Service Channel Level Drop Data Format Insert Data Format Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response Command Response Status Response lt add TDF_ xxxx cr gt add TDF_ xxxx cr lf add TDF add TDF xxxx cr lf add RDF xxxx cr gt add RDF_xxxx cr If add RDF add RDF xxxx cr If add TDP xxx cr add TDP add TDP cr add TDP 1 add RDP add RDP xxx cr lf add RDP add RDP xxx cr f add RTSM xxx cr 2add RTSM xxx cr If add RTSM 2add RTSM xxx cr If
190. rward Error Correction FEC Hardware Option G 703 Optional Interface with Overhead Card 5 10175 50 pin interface and access to IESS ESC SLM 7650 Satellite Modem Revision 4 Introduction MN SLM7650 IOM 1 3 Operating Modes Table 1 1 Operating Modes Moe 0 7650 00 This is the basic OM 73 compatibility mode 7650 02 This mode is compatible with the SLM8650 02 modem up to 8 448 Mbps data rate limit of the SLM 8650 Operation in this mode requires the optional ASYNC option to be activated EFD This is the basic closed network non OM73 operating mode compatible with legacy closed network Comtech EF Data modems ASYNC This mode allows for an asynchronous overhead channel to be multiplexed and demultiplexed onto the primary data channel Automatic Uplink Power Control AUPC is available to maintain the link margin of a duplex link during the normal fades that occur with a satellite communication network and VSAT IBS used within the INTELSAT and EUTELSAT satellite networks emulating most proprietary modems 1 4 Options Table 1 2 SLM 7650 Options Option 7 PartNo _____ Description Remarks Chassis Configuration PL 9709 1 90 264 VAC TNC Standard PL 9709 2 90 264 VAC BNC SS SLM7650 0010 Baseband Interface Modulation Type QPSK OQPSK X Standard SS SLM7650 0005 8 PSK 16 QAM ______________ 96 Kbpsto 10 Mbps Standard Overhead Framing SS SLM7650 0007 IESS
191. s Mee 4 12 4 4 u au u un ua SHOP 4 13 A YN MEM 4 13 242 oq 4 14 J lO OR 4 17 Z4 xD NOBLE ABO aco eet s au mua N 4 17 4 4 3 2 Transmit and Receive e tad M 4 17 4435 Reference and Clock qo a qayaqa Sh ha 4 24 CHAPTER 5 MAINTENANGCGE 5 1 5 1 Modem Firmware onte rer nanaq ushata EIS DER ee Ee 5 1 5 2 Fault 150 u u au m aaa 5 4 524 m E TEN 5 4 5 4 32 awa 5 4 524 2860 inde 5 8 229 Fault Alarm 5 9 5 T Modulator E QUE DES aha 5 9 322 Demodulator E auli Dd tecum 5 10
192. s Stored faults may be viewed by entering the stored faults level from the Select menu Stored faults are not maintained through controller power on reset cycle However the last known time is maintained in nonvolatile Random Access Memory RAM On power up a common equipment fault is logged with that time and date Also on power up an additional common equipment fault is logged to indicate the power up time and date The power down and power up times are logged as common equipment fault 0 and common equipment fault 1 respectively On entering the stored faults level press lt or to move between the fault groups and the Clear Stored Faults selections The time and date of the first stored fault status for the selected group will be displayed alternately on line 2 of the display Press T or 4 to cycle through the selected group s stored fault status through display the fault status associated with the displayed time and date press ENTER To identify the fault press lt to move the flashing cursor To clear the stored faults currently logged press ENTER when the Clear Stored Faults Y es selection 15 displayed Note Faults are stored in time sequence with the oldest fault status change stored in and the most recent in Only the first 10 fault status changes stored All stored faults which have not been used indicate No Fault on t
193. sampled output from the modulator Also demodulator 15 programmed to the same IF frequency as the modulator This test mode 15 a quick way to verify the operation of the modem without the need to disconnect any cables When IF loopback 15 turned off the demodulator is programmed back to the previous frequency and is reconnected to the IF input NOTE The data rate of the mod and demod must match for IF Loopback to operate properly The modulator channel is not affected by this test mode and will CUSTOMER DATA REMOTE SERIAL INTERFACE FAULT INDICATORS continue to operate normally ENCODER INTERFACE MODULATOR POWER SUPPLY MICRO WE COMPUTER DEMODULATOR DECODER SATELLITE MODEM Figure 5 9 IF Loopback TRANSMIT RF EQUIPMENT AC POWER ANTENNA RECEIVE RF EQUIPMENT SLM 7650 Satellite Modem Revision 4 Maintenance MN SLM7650 IOM 5 3 4 2 Base Band Loopback When baseband loopback is turned on Configuration Interface menu data is looped back on the customer side of the interface This is a bi directional loopback of the baseband data This test mode will verity the customer equipment and cabling between the modem and the customer equipment NOTE The data rate of the mod and demod must match for IF Loopback to operate properly Both the modulator and demodulator sections of the modem are affected by activating this test mode ENCODER TRANSMIT RF MODULATOR EQUIPMENT INTERFACE ll REMO
194. sed the overall coded modulation approach 15 referred to as Trellis Coded Modulation TCM Ungerboeck was an early pioneer and developed optimum mapping and decoding schemes However the decoding scheme was seen as complex and expensive and Qualcomm Inc developed a variation on the theme which uses a Viterbi decoder at the core surrounded by adjunct processing The scheme 15 able to achieve performance very close to the optimum Ungerboeck method but with far less complexity and is called pragmatic Trellis Coded Modulation Intelsat recognized that as more and more high power transponders are put in to service the transponders are no longer power limited but bandwidth limited In order to maximize transponder capacity they looked at SPSK as a method of reducing the occupied bandwidth of a carrier and adopted Qualcomm s pragmatic TCM at Rate 2 3 A Rate 2 3 SPSK TCM carrier occupies only 5090 of the bandwidth of a Rate 1 2 QPSK carrier However the overall coding gain of the scheme 15 not adequate by itself and so Intelsat s IESS 310 specification requires that the scheme be concatenated with an outer R S codec When combined there 15 a threshold value of Eb No of around 6 dB and above approximately 7 dB the bit error rate is better than 1 x 107 4 6 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 3 3 4 4 3 3 4 1 The detractions of the concatenated R S approach apply here also along with more s
195. small increases in signal input Symbol Rate Symbol rate 15 the rate that the modulated output signal changes from one phase or amplitude state to another It is represented by the actual bandwidth of the transmitted carrier at the 3 dB down points from top of the spectral waveform It 15 useful for determining the frequency allocation of the satellite transponder It 1s also used to calculate the frequency separation for each carrier on the satellite SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 3 7 Symbol Rate Calculations SR DR OH 1 FEC RSF SR Symbol Rate DR Data Rate OH Overhead Rate FEC Forward Error Correction MF Modulation Format RSF Reed Solomon Factor Overhead for IDR Overhead for IBS ASYNC FEC MF 96 kbps Data rates are 1544 2048 6312 and 8448 Mbit s 1 15 IBS Data rates are n x 64 kbit s to 2 048 Mbit s 1 2 3 4 7 8 2 3 5 6 21 44 5 16 17 18 BPSK 1 QPSK 1 2 OQPSK 1 2 8PSK 1 3 16QAM 1 4 Reed Solomon Factor RSF 1 0 if Reed Solomon 15 disabled else refer to Table 4 6 For the N K values listed the Overhead varies from 8 96 to 12 5 Mas Owmedye RE N None ASYNC IBS TCM IDR Small Carrier IDR TCM IDR at T1 E1 T2 E2 IESS 310 Compliant 8PSK 2 3 only Non IESS 310 Compliant 8PSK 2 3 and all other modulation types and code rates Table 4 6 Reed Solomon Factor None VSAT IBS IBS 309 IBS IDR Small Carrie
196. sol Status continued Parameter Parameter Name Number Command Reference 107 Receive IESS 310 Mode ref R310 command Description p107 n where n is 0 off or 1 on 108 Transmit BPSK Data Ordering ref p108 n where is NRM 1 INV 109 Receive BPSK Data Ordering ref RDA command p109 n where is 0 NRM 1 INV 110 RTS TX IF Control Mode ref RTSM command p110 n where n is 0 off or 1 on 111 Scrambler Type ref command p111 n where n is 0 IESS 1 OM73 2 TURBO 112 Descrambler Type ref DCRT command p112 n where is 0 IESS 1 OM73 2 TURBO 113 Modulator RS Codeword ref MRSC command p113 7 n where n is 0 RS 225 205 10 depth 8 1 RS 225 205 10 depth 4 2 RS 219 201 9 depth 8 3 RS 219 201 9 depth 4 4 RS 194 178 8 depth 4 or 5 RS 126 112 7 depth 4 114 Demodulator RS Codeword ref DRSC command p114 n where n is 0 RS 225 205 10 depth 8 1 RS 225 205 10 depth 4 2 RS 219 201 9 depth 8 3 RS 219 201 9 depth 4 4 RS 194 178 8 depth 4 or 5 RS 126 112 7 depth 4 Note 5 115 IDR TX ESC Type p115 n where n is 0 2x32Kbits s Audio 1 64Kbit s ref command Data Note 6 116 IDR RX ESC Type p116 n where n is 0 2x32Kbits s Audio
197. st likely maintain synchronization Loop timing Buffer size will compensate for two times the expected Doppler shift One end of the link is imed from the other end 14 19 CLOCK 4 35 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM This page 15 Intentionally blank 4 36 5 1 Chapter 5 The SLM 7650 is designed for operation without the need for periodic maintenance This chapter will provide information on modem firmware upgrades fault isolation and modem performance verification procedures Modem Firmware Upgrade The use of flash memory has alleviated the necessity to remove and replace individual ICs that contain the firmware when an upgrade is required A reflash of the modem will take less than 4 minutes Reflash of the modem will completely reconfigure the modem to the default parameters Scheduled equipment downtime will be required otherwise the network will be adversely affected Comtech EF Data will provide the program and the files required for the reflash of the modem The procedure for a USB reflash upgrade 15 located on the Comtech EF Data web site and will also be sent with the new upgrade files Care is required to assure the use of the proper files when upgrading the modem Using old reflash files may result in the modem being out of service until the proper files are used to make the upgrade A standard perso
198. synchronized only 3 4 3 4 Receive Interface Faults Menultem ____ Specifications MODULE RX Interface section fault Typically indicates that the RX Interface section will not program BUFFER CLK PLL Buffer clock phase locked loop fault Indicates the buffer clock PLL is not locked BUFFER CLK ACT Activity detector alarm of the selected interface receive clock The interface will fall back to the satellite clock when this fault is active RX DATA AIS Data or AIS When DATA fault is selected in the Configuration Interface menu the fault indicates a data stable condition This indicates the data coming from the satellite is all 1s or Os i e data is not transitioning When AIS is selected the alarm indicates the data is all 1s from the satellite When NONE is selected the RX Data AIS Fault Alarm is not activated Note AIS is an alarm not a switching fault DEMUX LOCK DEMUX lock fault Indicates that the Demux is not locked RX 2047 LOCK RX 2047 lock alarm Indicates the RX 2047 data pattern is not locked Note This alarm is only active when receive 2047 is on BUFFER OVERFLOW Buffer overflow alarm Indicates that a buffer overflow has occurred BUFFER UNDERFLOW Buffer underflow alarm Indicates that a buffer underflow has occurred BUFFER FULL Buffer full alarm Indicates the buffer is less than 1096 or greater than 909 full BACKWARD ALARM Indicate reception of IBS backward alarms RX INSERT D amp I Insert fault Typ
199. t and receive baseband interface section and the reference and clock distribution section Monitor and Control The remote serial monitor and control port is selectable as RS 232 or RS 485 The remote control port is used to retrieve status or provide user control of the modem from a remote location and is also used to upgrade the firmware on each CCA A fault connector provides Form C contacts for reporting faults on each CCA Transmit and Receive Baseband The primary data channel is available on a TIA EIA 449 37 pin or an optional TIA EIA 530 25 pin subminiature D shell connector The data and clock signals conform to MIL 188 114 type II and III and TIA EIA 422 balanced data and clock signal levels The digital data baseband loopback occurs between the transmit and receive sections of the modem This baseband loopback 15 a bi directional loop at the input and output of the interface drivers and receivers This will allow the operator to verify a valid baseband connection to the modem An overhead channel is available for Asynchronous ASYNC serial communications between the two ends of the satellite link and Automatic Uplink Power Control AUPC This overhead channel increases the symbol rate by 6 796 This overhead function is a closed network application that is compatible with SLM 8650 operating in 8650 02 mode The interface for the overhead data 1s available on a 9 Pin D connector at the rear panel of the modem The elect
200. ta transitions This test mode will affect the transmit side of the modem by switching from the incoming data stream to the internal pattern generator The receive side of the modem 15 not affected and 15 only a monitor of the recovered satellite data steam 5 22 SLM 7650 Satellite Modem Revision 4 Maintenance MN SLM7650 IOM Table 5 8 Conversion to S N and Ep N9 Chart BPSK GIOQPSK 8 30 oo oo 30 oo 45 25 30 40 55 ss o o 21 os 45 21 38 45 48 22 18 00 08 42 22 39 36 as 26 2e se 04 26 os 02 0 22 28 so 64 03 16 o 08 4 21 ar 47 78 17 23 17 07 es 54 24 54 36 24 14 os 00 80 30 4s 36 24 13 06 es 97 se 49 42 e 27 19 22 73 73 42 73 55 48 2 25 18 54 67 6o 54 44 36 30 s 90 so 2o eo 90 72 66 o so 42 35 106 106 127 78 89 82 76 67 59 52 117117 147 100 93 87 77 63 5 122 122 153 92 122 105 2 83 75 68 aso 128 128 158 128 103 98 73 140 138
201. table from the modem front panel user interface and must be in the range of 1 to 255 Note is used to indicate a valid 1 to character device address the range between 0 to 255 SLM 7650 Satellite Modem Revision 4 Remote Control Specifications MN SLM7650 IOM A 6 Command Response The command response portion of the message contains a variable length character sequence that conveys command and response data If the modem receives a properly formatted message command which is addressed to it with valid parameters the message will be echoed back in the response as defined by the protocol If the modem receives a message addressed to it which does not match the established protocol or cannot be implemented a negative acknowledgment message is sent in response This message 1s gt add ER2 invalid parameter cr 1f Error message for a recognized command which cannot be implemented or has parameters which are out of range gt ADD ER3 UNRECOGNIZABLE COMMAND Error message for unrecognizable command or bad command syntax gt ADD 4 MODEM IN LOCAL MODE CR LFE Modem in local error send the REM command to go to remote mode ADD ER5 HARD CODED PARAMETER CR LF Error message indicating that the parameter 1s hardware dependent and may not be changed remotely 7 Character Each message is ended with a single character which signals the end of
202. terial Authorization RMA number from the Comtech EF Data Customer Support Department 3 Be prepared to supply the Customer Support representative with the model number serial number and a description of the problem 4 To ensure that the product is not damaged during shipping pack the product in its original shipping carton packaging 5 Ship the product back to Comtech EF Data Shipping charges should be prepaid For more information regarding the warranty policies referred to the Warranty Policy at the end of this chapter Table of Contents CHAPTER INTRODUCTION Rr UEM EIU un San D Sa 1 1 1 1 w m Poe w 1 1 1 2 DESCEIDUOD 1 2 1 2 1 Definition of Modulator Functions Z 1 3 1 2 2 Definition of Demodulator Functions 0 50000000 1 3 1 2 3 Definition of Interface M amp C Functions cccceccescecccsccscceccesceccescesccesceccescusscescescesceccescssscescescescuees 1 4 1 24 Addiionatiiogtpa u L u Ce nuy sn uuu a 1 4 1 3 Operating Modesu u uu u sS ee eee 1 5 1 4 5 1 5 1 5 Systeni SpecHications
203. tet signal at 1 kHz for byte alignment purposes ESC Backward Alarms 4 alarm inputs with 1 k pull ups to 5 Vdc Pull input to ground to clear alarm 4 alarm outputs with Form C relays NO NC and C contacts The alarm condition is indicated by a connection between the NO and C contacts Demodulator Fault Relay Form C relay with NO and C contacts available for backward alarm inputs Contacts NO and C are connected when no demodulator fault is present IDR Deferred Open collector output Sources ground when alarm is not asserted Maintenance Alarm Output rated 15 Vdc max 20 mA max 4 22 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 4 3 2 1 9 Drop amp Insert The interface option card provides Drop amp Insert D amp I functional support The following table provides definitions for D amp I Terrestrial Data Rates 1544 0 kbps 11 2048 0 kbps 1 Terrestrial Framing G 732 G 733 G 704 D amp I Formats T1 D4 framing T1 Extended Super Frame ESF E1 Common Channel Signaling CCS and E1 Channel Associated Signaling CAS Satellite Data Rates N x 64 0 kbps is the number of 64 0 kbps channels N 1 2 3 4 5 6 8 10 12 15 16 20 24 T1 and CCS N 1 2 4 6 8 12 16 24 30 CAS Satellite Overhead 1 15 of satellite data rate per IESS 309 D amp I Time Slot to Channel Terrestrial slots Mapping 1 10 24 E1 CCS 1 to 31 E1 CAS
204. the error rate 15 less than or greater than the returned value m m 1 0 to 9 9 error rate mantissa ee 1 to 99 error rate exponent Notes The lt gt parameter is only returned if the error rate has exceeded the computational resolution of the system No Data is returned if the error rate cannot be calculated Sampling is returned if not enough data is currently available to calculate the error rate Corrected Command add CBER Where BER Response gt add CBER_xm mE ee cr lf x lt or gt data to indicate that the error rate 15 less than or greater than the returned value m m 1 0 to 9 9 error rate mantissa ee 1 to 99 error rate exponent Notes The X lt or gt parameter is only returned if the error rate has exceeded the computational resolution of the system Data is returned if the error rate cannot be calculated Sampling is returned if not enough data is currently available to calculate the error rate Interface Command add IRES Where Read Error Response add IRES xn nE ee cr If Status tttttt 2047 or MIL188 indicates type of error being read x lt or gt data to indicate that the error rate 15 less than or greater than the returned value m m 1 0 to 9 9 error rate mantissa ee 1 to 99 error rate exponent This command returns 2047 or MIL188 error rate The IRE_ configuration
205. the peak to peak uplink plus downlink delay and the maximum rate of variations include the uplink and downlink Table 4 8 Recommended Buffer Size Satellite Orbit Buffer size in milliseconds Inclination Example 1 Nominal Doppler Plesiochronous Example 2 Doppler only 4 34 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM EXAMPLE 1 Includes a factor of two to allow the buffer to start in the center and then drift in either direction This will allow the buffer to start at any time and at any satellite position in the figure eight pattern The buffer size must be increased to lengthen number of days between slips Example 1 Buffer size will compensate Tor doppler plesiochronoeus timing Expect periodic slips ol dala depending on lhe bule size EXAMPLE 2 shows a MASTER SLAVE link and will include a factor of two to allow the buffer to start in the center plus an additional factor of two to account for the passage of the timing signal twice through the satellite The actual buffer size may be larger for primary framed data like T1 T2 El or E2 Framed signals require the buffer size to be an integer multiple of the frame length of the data Setting the buffer size to a multiple of the frame length will decrease the need for the user equipment to re acquire frame synchronization If a complete frame or group of frames 15 missing because of a buffer slip then the user equipment will mo
206. tional Symbols Alternating Current Safety Ground Chassis Ground NOTE additional symbols refer to Cautions and Warnings listed earlier in this preface Xi SLM 7650 Satellite Modem Revision 4 Preface MN SLM7650 IOM Warranty Policy This Comtech EF Data product is warranted against defects in material and workmanship for a period of one year from the date of shipment During the warranty period Comtech EF Data will at its option repair or replace products that prove to be defective For equipment under warranty the customer 1s responsible for freight to Comtech EF Data and all related custom taxes tariffs insurance etc Comtech EF Data is responsible for the freight charges only for return of the equipment from the factory to the customer Comtech EF Data will return the equipment by the same method 1 e Air Express Surface as the equipment was sent to Comtech EF Data Limitations of Warranty The foregoing warranty shall not apply to defects resulting from improper installation or maintenance abuse unauthorized modification or operation outside of environmental specifications for the product or for damages that occur due to improper repackaging of equipment for return to Comtech EF Data No other warranty is expressed or implied Comtech EF Data specifically disclaims the implied warranties of merchantability and fitness for particular purpose Exclusive Remedies Disclai
207. to 25 dBm Verlfy that the Power Meter Indicates an output power between 24 5 and 25 5 dBm Change the TX Power Level to 5 dBm Verlfy that the Power Meter Indicates an output power between 4 5 and 5 5 dBm SLM 7650 Satellite Modem Revision 4 Maintenance 9 3 2 5 3 2 1 5 3 2 2 5 3 3 MN SLM7650 IOM Demodulator Tests The tests listed will give reasonable assurance that the demodulator section is performing to specification The test equipment used in these test 15 listed in Table 5 7 demodulator tests require connection to a known good modulator that 15 capable of being configured to the same operating modes as the demodulator under test These tests can be run without a Noise test set but the confidence level of the test 15 reduced Dynamic Range In the Utility Modem Type menu configure the modem for modem type 7650 00 Set the level into the demodulator for 15 dBm and an Eb No of 5 0 dB Verify that the demod locks and the Fireberd syncs Set the level into the demodulator for 55 dBm and an Eb No of 5 0 dB Verify that the demod locks and the Fireberd syncs Acquisition Range 1 Continue from the previous step and set the level Ito the demodulator for 40 dBm and an Eb No of 5 0 dB Verify that the demodulator locks and the Fireberd syncs In the Monitor menu observe the frequency the demodulator Sweep Frequency Set the IF frequency of the test modula
208. tor Built in Test BIT function that detects fault conditions and allow faults to be isolated to the demodulator This includes provision for an IF loopback and a way to measure the error using a test data pattern SLM 7650 Satellite Modem Revision 4 Introduction 1 2 3 1 2 4 MN SLM7650 IOM Definition of Interface M amp C Functions The interface M amp C section consists of a device having the following identifiable functions 1 Terrestrial Interface defined by EIA 422 balanced circuits MIL STD 188 114A Type II and compatible Multiplex Demultiplex an asynchronous data channel onto the primary data channel Provide Intelsat compatible Overhead Framing for Open Network interoperability Provide a buffer that can be clocked by the Tx terrestrial source an external reference internal clock or from the recovered clock from the satellite link Monitor the modem status without interrupting service Provide an interface for control of the modem parameters via the front panel or serial remote control interface Additional Features The modem contains the following additional features Fully Accessible System Topology FAST Built in self test BIST Asymmetrical loop timing ASLT Selectable near or far end baseband loopback with ASYNC overhead option enabled Intelsat compliant Reed Solomon Codec ASYNChronous Channel Unit Overhead ASYNC Automatic Uplink Power Control AUPC Turbo Product Code TPC Fo
209. tor 70 025 MHz Turn on transmit power on the test modulator Verify that the demodulator locks and the Fireberd syncs In the Monitor menu observe the frequency the demodulator Sweep Frequency Set the IF frequency of the test modulator to 69 975 MHz Turn on transmit power on the test modulator 10 Verify that the demodulator locks and the Fireberd syncs 11 In the Monitor menu observe the frequency the demodulator Sweep Frequency BD System Test 1 Continue from the previous step but change the modulator and the demodulator data rate to 1544 kbps 1 2 rate CEVD 2 Connect the demodulator input to the output of a Noise test set that 15 connected to the modulator and a BER tester Verlfy that the demodulator operates within the specified Eb No performance 4 Additional data rates can be done to verify operation over the full data rate range BER testing can become very time consuming at low data rates 95 Note Accumulation of 20 error events error seconds is the generally considered a valid BER test For Reed Solomon testing this can become extremely time consuming SLM 7650 Satellite Modem Maintenance 5 3 4 Modem Test 5 Revision 4 MN SLM7650 IOM The modem has bullt In capability to assist the operator In performance verification 5 3 4 1 IF Loopback When loopback 15 turned ON Configuration Demodulator menu the demodulator Input 15 Internally connected to a
210. tringent requirements for phase noise and group delay distortion the natural consequences of the higher order modulation Table 4 3 8PSK TCM Coding Summary Exceptionally bandwidth efficient Needs concatenated RS outer codec to give compared to QPSK acceptable coding gain performance Demod acquisition threshold much higher than for QPSK 8PSK is more sensitive to phase noise and group delay distortion than QPSK Turbo Product Codec Hardware Option Introduction Turbo coding is an FEC technique developed within the last few years which delivers significant performance improvements compared to more traditional techniques Two general classes of Turbo Codes have been developed Turbo Convolutional Codes TCC and Turbo Product Codes TPC a block coding technique Comtech EF Data has chosen to implement an FEC codec based on TPC A Turbo Product Code 15 2 3 dimensional array of block codes Encoding is relatively straightforward but decoding is a very complex process requiring multiple iterations of processing for maximum performance to be achieved Unlike the popular method of concatenating a Reed Solomon codec with a primary FEC codec Turbo Product Coding is an entirely stand alone method It does not require the complex interleaving de interleaving of the R S approach and consequently decoding delays are significantly reduced Furthermore the traditional concatenated R S schemes exhibit a very pronounced threshold ef
211. uency reference 15 distributed within the modem enclosure This frequency reference is the frequency standard for all frequencies generated within modem This reference 15 a phase lock loop circuit that is driven by either an Internal high stability oven controlled oscillator or an external modem reference signal The external modem reference input on the rear panel of the modem is user selectable as 1 5 10 or 20 MHz Modem Clocking Clocking the data In and out of the modem is extremely important Loss of synchronization will occur if the selections are not correct The operator must understand the clock settings at the user equipment before any selections are made at the modem The modem clock selection is designed to accommodate most system timing requirements that are encountered in a satellite communication link Clock selections on the transmit baseband section will define the timing standard for the carrier sent toward the satellite Clock selections on the receive baseband section will define the timing standard for the data sent toward the terrestrial side of the satellite link The basic system timing modes discussed here fall variations of three basic timing configurations Master Slave Master Master and Asymmetrical Master Slave Transmit Clock choices 1 Internal ST 2 TX Terrestrial Terminal Timing TT TIA EIA 449 pins 17 and 35 3 Data Source SYNC Recovers Clock from the Data Receive Buffer Clock Choices 1 Intern
212. urce for the SCT PLL the frequency of the MC must meet one of the three following a The MC frequency is equal to the transmit data rate b The transmit data rate and the MC freq are both integer multiples of 600 Hz C The transmit data rate and the MC freq are both integer multiples of 1 kHz If the EXT MC is selected as the timing source for the Buffer Clock the frequency of the MC must meet one of the three following a The MC frequency is equal to the receive data rate b The receive data rate and the MC freq are both integer multiples of 600 Hz The receive data rate and the MC freq are both integer multiples of 1 kHz On entry the current setting for the external reference is displayed Press or gt to increment or decrement the digit at the flashing cursor Press ENTER to execute the change BUFFER CLOCK Programs the interface buffer output clock to one of the following modes RX Satellite Turns off the buffer This will clock the data in and out of the buffer with the same receive satellite clock This is the fall back when either TX Terrestrial or the External Master Clock is missing SCT Internal Clocks the data to the user with the internal clock of the modem This is also the fallback clock External Master Clock Clocks the data to the user with the external master clock input The MC input is on the baseband data interface The frequency must be programmed in the Ext Master Clock Frequency
213. urned for ASYNC Overhead Data is only returned for RX ASYNC Overhead Data is only returned when the modem type is set to CUSTOM and RX Overhead is either NONE or ASYNC SLM 7650 Satellite Modem Revision 4 Remote Control Specifications MN SLM7650 IOM Data is only returned when the option card is installed and RX Overhead is IDR Data is only returned when the option card is installed and RX Overhead is DI Data is only returned when the option card is installed Data is only returned when the option card is installed and RX Overhead is ASYNC 28 SLM 7650 Satellite Modem Remote Control Specifications A 15 Interface Config Status Interface Configuration Status Command Response lt add ICS_ cr gt add ICS_ cr IRFS T1 IRFS T2 xxx cr IRFS E1 xxx cr IRFS E2 xxx cr IBS nnnnnn cr xxxxx cr IROT xxxxx cr ISP IRE TDF RDF xxxx cr ISCL TX1 nnn cr Note 5 ISCL TX2 nnn cr Note 5 ISCL RX1 nnn cr Note 4 ISCL RX2 nnn cr Note 4 Note 8 Note 8 TET Note 5 RET xxxxx cr Note 4 DDF dd cc dd cc IDF
214. urnished to Government Activities Electrical Characteristics of Balanced Voltage Digital Interface Circuits Standard for Electrical Characteristics of Generators and Receivers for use in Balanced Digital Multi point Systems High Speed 24 Position Interface for Data Terminal Equipment and Data Circuit Terminating Equipment Performance Characteristics for Intermediate Data Rate IDR Digital Carriers QPSK FDMA Performance Characteristics for Intelsat Business Service IBS Performance Characteristics for Intermediate Data Rate using 8PSK 2 3 Standard A B C E and F Earth Stations Joint Industry Standard Requirements for Soldered Electrical and Electronic Assemblies American National Standard for Board Level Live Insertion for VME Quality System SLM 7650 Satellite Modem Revision 4 MN SLM7650 IOM Preface Comtech EF Data Specifications SP 9710 Comtech EF Data Specification SLM 7650 Satellite Modem SP 9710 1 Comtech EF Data Specification SLM 7650 Remote Control Protocol Specification Conventions and References Cautions and Warnings CAUTION indicates a hazardous situation that if not avoided may result in minor or moderate injury CAUTION may also be used to indicate other unsafe practices or risks of property damage WARNING indicates a potentially hazardous situation that if not avoided could result in death or serious injury IMPORTANT indicates a statement that is associated with the task being performed
215. urrently programmed ref TOBR baud rate Note 2 84 ASYNC RX Overhead Baud Rate P84 nnnnn where nnnnn is the currently programmed ref ROBR command baud rate Note 1 85 ASYNC TX Channel Char Length p85 n where n is the currently programmed character ref TCCL command length 7 or 8 bits Note 2 86 ASYNC RX Channel Char Length p86 n where n is the currently programmed character ref RCCL command length 7 or 8 bits Note 1 87 5 TX Channel Stop Bits p87 n where n is the currently programmed number of ref TCSB_ command Stop bits 1 or 2 Note 2 88 ASYNC RX Channel Stop Bits p88 n where n is the currently programmed number of ref RCSB command A 41 stop bits 1 or 2 SLM 7650 Satellite Modem Remote Control Specifications Revision 4 MN SLM7650 IOM Bulk Consol Status continued Parameter Parameter Name Number Command Reference Description Note 1 89 ASYNC TX Channel Parity p89 xxxx where is the currently programmed parity ref command Note 2 90 ASYNC RX Channel Parity p90 xxxx where is the currently programmed parity ref ROCP command Note 1 91 ASYNC Communications Type p91 where is 0 RS232 1 RS485 AWire or 2 ref command RS485 2Wire Note 2 92 ASYNC Communications Type p92 n where n is 0 RS232 1 RS485_4WIRE or 2
216. ut reference source one of the following constraints must be satisfied a Reference frequency is equal to RX data rate b Receive data rate and REF frequency are both integer multiples of 600 Hz c Receive data rate and REF frequency are both integer multiples of 1 kHz Internal clock i Reference User recovers External detect the clock for Master Clock TT and SD from the Master clock TRANSMIT To TX IF Output RT clocks in the RD pum From decoder User x Modem Clock Master Ext Master Clock Figure 4 6 EXT Master Clock as Source 4 29 SLM 7650 Satellite Modem Revision 4 Theory of Operation MN SLM7650 IOM 4 4 3 3 2 6 Timing Configuration 6 User Provides Data Only Modem Reference clock 15 either INT 1 5 10 20 MHz TX Clock Source Data Source Sync X 21 operation will not have a TX terrestrial clock to the modem Buffer clock is set to RX satellite OFF or Bypass This user 15 generating the transmit clock from the send data SD Figure 4 7 The User must not use ST to generate SD Internal clock Reference User generates SD from a timing source other than ST i SD TRANSMIT To TX IF Output clocks in the RD From decoder Receive Buffer Clock Master User User M
217. ute the change Displays or selects the current N K T and Interleave values for the Reed Solomon FEC The standard code word can only be changed when CUSTOM is the selected modem type in the Utility Menu TX SYMBOL RATE Status Only Displays the current TX Symbol Data Rate within 9 6 ksym s to 10 Msym s 3 28 SLM 7650 Satellite Modem Operation Revision 4 MN SLM7650 IOM 3 4 6 2 Utility Demodulator Menu 0 Specifications usage ASSIGN RECEIVER FILTERS DEMODULATOR TYPE DECODER TYPE RX BPSK ORDERING DEMOD SPECTRUM RX IESS 310 MODE RX R S CODE WORD Filter A B C D or V Data rates are referenced in paragraph 3 3 Note These assignments are used for the selection of the Rx rate in the Configuration Functions menu Receive filter type select Select Type INTELSAT OPEN or EFD CLOSED network receive filtering Note This window is only available when CUSTOM is selected for modem type in the Utility menu FEC type select Select VITERBI or TURBO Note This window is only available when CUSTOM or EFD is selected for modem type in the Utility Menu Receive BPSK bit ordering selection Select STANDARD or NON STANDARD Press an arrow key to make the selection Press ENTER to execute the change Programmable vector rotation Select NORMAL or INVERT for spectrum reversal of the and Q baseband channels Press an arrow key to make the selection Press ENTER to execute the chan
218. verhead only Where xxx ON or OFF remote transmit 2047 pattern enable Note Transmit 2047 Pattern Where xxx ON or OFF remote baseband loopback enable Note ASYNC Overhead only Where n 1 to 9 error rate number e 2 to 6 exponent Note Received 2047 Pattern This command returns 2047 BER from the remote AUPC modem If data is not valid the message Data is returned in lieu of BER data SLM 7650 Satellite Modem Remote Control Specifications A 13 A 13 1 Modulator Config Status Status Commands Responses Revision 4 MN SLM7650 IOM Modulator Configuration Status Command Response add MCS gt add MCS_ cr nn nnnnnnn cr MR_nnann_mmmmm mmmi cr AMRA_nnnn_mmmmm mmm cr AMRB_nnnn_mmmmm mmm cr AMRC nnnn mmmmm mmm cr AMRD nnnn mmmmm mmm cr AMRV nnnn mmmmm mmm cr MPO snn n cr SE DENC xxx cr MT xxxxx cr MET xxx cr COM MSR RSEN xxx cr MSPR xxx cr TDA xxx cr SCRT xxxx cr T310 nnn i cr If Note 1 A 23 RF Output Modulator Frequency Modulator Rate Preset A Assignment Preset B Assignment Preset C Assignment Preset D Assignment Preset V Assignment Modulator Power Offset Modulator Output Power Scrambler Enable Differential Encoder Modulator Type Modulator Encoder Type Carrier Only Mode Modem
219. y resolution and lock detect are performed differently than when Viterbi or TPC FEC 15 used Inversion ambiguity 15 resolved by 1 Differentially encoding both the I and Q channels in the modulator 2 Subsequently differentially decoding both the I and Q channels in the demodulator In Offset QPSK modulation the bit ordering ambiguity is resolved since the ordering is inherent in the modulated carrier By inserting the 1 2 symbol period delay in the I channel data path and using the Q channel symbol interval as the reference I occurs before Q Thus the data is ordered I then Q into a single bit stream Carrier lock is determined by sensing the quality of the eye pattern In OQPSK both eyes should be as wide as possible In BPSK the I channel eye should be wide open and the Q channel eye should be closed Special circuitry determines when the eye pattern on either channel is not within a valid range and declares lock accordingly The alternate descrambler provides OM 73 compatible descrambling of the decoded data stream The descrambler is the non recursive counterpart to the OM 73 scrambler The scrambled data enters an 11 bit shift register where taps 9 and 11 are exclusive to provide a synchronous reset to an 8 bit counter adverse state detector The following are all exclusive NORed to form the descrambled output Terminal count of this counter e Inverse of the input data e Taps 9 and 11 of the shift register T
220. ystem The interface for the selectable EIA TIA 232 485 ASYNC data channel is on the rear panel 9 pin ASYNC connector J2 The ASYNC mode of operation 15 compatible with the ASYNC operating mode of any Comtech EF Data satellite modem Operation in this mode requires the ASYNC framing option to be activated 3 45 SLM 7650 Satellite Modem Revision 4 Operation MN SLM7650 IOM Table 3 10 ASYNC AUPC Default Parameters Function Configuration Modulator Demodulator Data Rate TXA 64 kbps QPSK 1 2 TX IF Frequency Output TX Power Level Scrambler Type Diff Decoder Scrambler Dif Encoder one Carrier Mode Normal Modulated RS Decoder 0000 Hz Reacquisition seconds 1 Interface TX Clock Source TX Clock Phase one SCT PLL REF one EXT REF Frequency Buffer Clock RX Clock Phase Normal ASYNC TX Baud 1200 Format 7E2 B Band Loopback Off ASYNC RX Baud 1200 Format 7E2 Buffer Size 384 bits ASYNC COMM TYPE EIA 232 Local AUPC Nominal Power Minimum Power Hol Maximum Power Remote CL Action Hold Function Select Remote AUPC AUPC Enable TX 2047 Pattern Utility OJO 2000 gt 3 2 N 0 lt N I Modulator Demodulator TX A 64 kbps QPSK 1 2 64 kbps QPSK 1 2 RX B RX C RX V TXB 256KbpsQPSK12 256Kbps QPSK 1 2 ncc 768 ____ QPSK 1 2 TxD 2048 kbps QPSK 1 2 V 128 k

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