PSM-500_AP_G703-E1_Rev 0_11
Contents
1. Table 1 G5 Interface Front Panel Parameter Details Interface Parameter Detail when G 703 is Active Representation Type Entry Description Status I O Read Only N A Interface Status Online Status Test Read Only N A Interface Test status Mod BER Status BER Read Only N A Interface Test status 0 0 E 7 Rev 0 11 Page G 703 4 Interface Parameter Detail when G 703 is Active Representation Type Entry Description Status SyncLoss Read Only N A Interface Test status 3 Status Errors Read Only N A Interface Test status 7 Status Bits Read Only N A Interface Test status 1 45 E7 Status EFS Read Only N A Interface Test status 99 95 Status ErredSec Read Only N A Interface Test status 1 Status TotalSec Read Only N A Interface Test status 2135 O Mode Selection 0 Disable Interface electrical mode G 703 1 RS 232 2 RS 449 Some option interfaces may 3 RS 449 Unterm replace the SnIP HSSI or 4 V 35 Ethernet IP and Dual G 703 5 V 36 interface 6 EIA 530 7 EIA 530A Other options may be added 8 Ethernet IP Option in the future 9 G 703 Option 10 Reserved 11 HSSI Option Rev 0 11 Page G 703 5 Interface Parameter Detail when G 703 is Active Representation Type Entry Description2. 5 RX D2 Receive Data 6 BI D4 Bi directional pair D 7 BI D4 Bi directional pair D 8 Figure 4 Ethernet SNMP interface 2 3 1 4 Console Connector The console connector is available for command line control and monitor of the Optional G5 processor card Table 4 Console Connector Pinouts 9 pin D female Signal Name Description Direction Pins Notes RXD Console RX From Modem 2 EIA 232 TXD Console TX To Modem 3 ElA232 GND Ground 5 2 3 1 5 USB2 0 The USB2 0 interface is reserved for future use 3 0 G5 Interface Installation The G5 interface is normally factory installed but can be field installed by technical personnel The option card itself is an approximate 3 5 inch by 7 25 inch printed circuit board designed to be mounted in the interface option position inside the PSM 500 series modem chassis Remove the modem unit from service before installation of the G5 Interface option Unplug the modem unit and remove the power cord from the rear for safety Rev 0 11 Page G 703 10 Place the unit on a flat surface and remove the 8 flathead screws holding the cover to the main chassis using a number 2 Philips screwdriver The location for the option card installation is shown in Figure below WARNING Failure to remove power from the modem unit before removal of the cover can expose the operator to hazardous voltages and result in harm to personnel and equipment 3 1 Installing t
3. CAS Framing is necessary in order for equipment receiving the E1 signal to identify timeslot alignment and extract or insert the proper data E1 signals configured with the PCM31 CCS format use the frame alignment signal FAS for synchronization When the PCM30 CAS format is used the multi frame alignment signal MFAS is used along with the FAS The multi frame structure also provides channel associated signaling CAS for PCM30 There is also an optional a cyclic redundancy check CRC in both PCM30 CAS and PCM31 CCS modes that is used to detect errors in the data stream Frame Alignment Signal FAS Rev 0 11 Page G 703 2 Timeslot 0 of every other frame is reserved for the FAS Alternate frames contain the FAS Distant Alarm indication bit and others bits reserved for national and international use 2 1 1 Multi Frame Alignment Signal MFAS MFAS framing provides Channel Associated Signaling CAS that transmist A B C D bit signaling information for each of 30 channels in timeslot 16 This method uses the 32 timeslot frame format with timeslot 0 for the FAS and timeslot 16 for the MFAS and the CAS 2 1 2 Channel Associated Signaling CAS When timeslot 16 of the E1 frame is used for Channel Associated Signaling CAS purposes frame 0 contains the MFAS and timeslot 16 of frames 1 15 is used to convey the state of the A B C and D signaling bits NOTE The ABCD state of 0000 is not allowed If all bits in timeslot 16 are 0 a loss of the M
4. the other end of the link The setup of the satellite link is very simple because the modems at both ends of the link are connected to DTE equipment with this same G 703 E1 interface type Each port of the G5 interface can be configured independently for either Full E1 or Fractional E1 operation The Full E1 mode allows for transmission of an the 2 048Mbps input data stream without synchronizing to the imbedded framing of the E1 signal In this case the port data rate though the satellite link is the full 2 048Mbps of the E1 transport stream Note in Unframed E1 there is no requirement for G 704 framing The Fractional E1 mode allows for data rates of Nx64kbps to be transmitted over the satellite The G5 interface has flexible selection the number of timeslots to be transmitted and for selection of standard signaling formats e PCM30 CAS Channel Associated Signaling Nx64Kbps N 1 to 15 17 to 31 TS PCM31 CCS Common Channel Signaling Nx64Kbps N 1 to 31 TS The FullE1 or Fractional E1 modes are controlled via the G 703 Frame parameter Any combination of Full E1 or Fractional E1 can be used independently on each port and can be used independently on the transmit or receive side of each port Rev 0 11 Page G 703 1 Key Features Single or Dual port G 703 E1 Unframed amp Fractional E1 operation e Data rate User selectable N x 64Kbps in PCM30 CAS or PCM31 CCS modes Fully transparent signal conversion under unframed
5. 48c connectors Port 1 and Port 2 The pinouts for the two connectors are shown in Table 2 and Figure shows picture of the interface connectors using a balanced 120ohm to unbalanced 750hm converter on Port 1 Table 2 Port 1 amp Port 2 Connector 120 ohm Balanced Pinouts RJ48c Signal Name Description Direction Pins SD T Send Data Tip To Modem 1 SD R Send Data Ring To Modem 2 RD T Receive Data Tip From Modem 4 RD R Receive Data Ring From Modem 5 GND Ground n a 3 6 2 3 1 2 G 703 E1 75 ohm Unbalanced The G5 interface offers dual G 703 E1 120 ohm balanced interface presented on 2 RJ 48c connectors Port 1 and Port 2 For 75 ohm unbalanced connections a balanced 1200hm to unbalanced 750hm BNC converter must be used like shown in Figure 3 This Balun adapter is available from Datum Systems Rev 0 11 75 Ohm BNC Unbalanced I O 120 Ohm RJ 48 Balanced I O Figure 3 Balanced to unbalanced converter Balun 2 3 1 3 10 100 Ethernet via the GbE IP Connection The 10 100 Ethernet interface connector is used for SNMP control and monitor of the PSM 500 modem Please refer to SnlP SNMP Guide for support information Table 3 GbE IP Connector Pinouts RJ45 Name Description Pin TX Di Transmit Data 1 TX D1 Transmit Data 2 RX D2 Receive Data 3 BI D3 Bi directional pair C 4 BI D3 Bi directional pair C
6. DATUM SYSTEMS Appendix G5 G703 E1 Interface PSM 500 Series G 703 E1 Interface Addendum Revision History Rev0 10 2 1 2012 Initial Release Rev 0 11 5 2 2012 Corrected E1 transport stream descriptions Corrected front panel menu entries 1 0 Optional G 703 E1 Interface Overview G 703 E1 is a legacy interface standard that is used in Telephony and Cellular Backhaul applications The installation of the optional G5 G 703 E1 interface provides the M500 Class modems PSM 500 500L 500LT with an economical access solution for E1 and Fractional E1 network services over satellite The G5 fully meet all of the E1 rate 2048 kbit s specifications including ITU recommendations G 703 Physical electrical characteristics of hierarchical digital interfaces G 704 Synchronous frame structures used at 1544 6312 2048 8448 and 44 736 kbit s hierarchical levels e G 706 Frame alignment and cyclic redundancy check CRC procedures relating to basic frame structures defined in Recommendation G 704 G 732 Characteristics of primary PCM multiplex equipment operating at 2048 kbit s G 823 The control of jitter and wander within digital networks which are based on the 2048 kbit s hierarchy NOTE If the G5 interface card is not already installed in the modem refer to Section 4 for installation information Typical use of the G5 interface is in a duplex point to point link with a similarly configured PSM 500 series modem at
7. Data input to Receive Data output Test Disabled SatLoopbck Selection 0 Disable 1 Enable Interface satellite loop back demodulator output to modulator input Test Satellite BERI O Selection 0 Satellite 1 Terrestrial BERT Function See Main User Manual for Description Test Disabled ModBER Selection 0 Disable 1 2047 2 2423 1 3 Insert 1 Error if enabled BERT enable to modem transmit input Test Disabled DemodBER 2 3 Selection 0 Disable 1 2047 2 2423 1 Making Connections to the G5 Interface BERT enable from modem receive output Figure 1 shows the rear interface panel of the PSM 500 series modem with the G5 optional interface installed G 703 E1 T1 GI 5 soe i morass PCAN Console Control O P2 J3 Data Interface te o 90 260 VAC 50 W 4 R G5 Option Interface P1 and P2 No Connection with G5 Only Option Figure 1 PSM 500 rear panel G5 Interface Location 2 3 1 The G5 interface has five 5 user interface connectors on the rear panel of the optional card Refer to Table 2 through Table 4 for the connector type signal names and connector pinouts G5 Connections Rev 0 11 Page G 703 8 Figure 2 G5 Option Rear Interface View 2 3 1 1 G 703 E1 120 ohm Balanced Interface The G5 interface offers dual G 703 E1 balanced interface presented on 2 RJ
8. FAS can be assumed When A Bit only signaling is used No BCD bits the BCD bits should be fixed at B 1 C 0 D 1 101 A detection of all 1 s in timeslot 16 declares a TS16AIS alarm which indicates a remote alarm with the upstream E1 equipment 2 1 3 Common Channel Signaling CCS When Common Channel Signaling CCS is employed G 704 allows for various types of signaling information to be carried in any timeslot therefore timeslot 16 is available for user or bearer data Common channel signaling CCS is signaling in which a group of voice and data channels share a separate channel that is used only for control signals This signaling protocol can be SS7 ISDN or PBX Switch Proprietary protocols The channel used for common channel signaling does not carry user information 2 1 4 E1 Line Coding The basic E1 signal is coded using the Alternate Mark Inversion AMI or High Density Bipolar 3 HDB3 In AMI coding ones are alternately transmitted as positive and negative pulses whereas zeros are transmitted as a zero voltage level AMI is not used in most E1 transmissions because synchronization loss will occur during long strings of data zeros In HDB3 coding a string of four consecutive zeros is replaced with a substitute string of pulses containing an intentional bipolar violation The HDB3 code substitutions provide high pulse density so that the receiving equipment is able to maintain synchronization with the received sig
9. G703P1 TxMode Selection 1 E1 G 703 E1 interface Port 1 E1 always active if G 703 IO Mode selected G703P1 TxCode Selection 0 AMI Line Coding selection HDB3 1 HDB3 G703P1 TxFrame Selection 0 Full E1 Input Framing selection PCM31 CCS 1 PCM30 CAS Full E1 Unframed Mode 2 PCM31 CCS G703P1 TxCRC4 Selection 0 Disable Cyclic Redundancy Check for Enable 1 Enable error reporting G703P1 TxXNx64k Read Only Nx64kbps fractional E1 rate 512 kbps for Port 1 transmitter G703P1 DropMap Selection TSxx 0 Off 1 On Used for FractionalE1 mode to TS08 On xx 01 to 31 select which timeslots 1 31 Press Up Down key to toggle that are to be dropped from between Off and On Press the input E1 framed signal and Left Right keys to change transmitted over the satellite Timeslot number Press Timeslot 16 not available in enter to program all timeslots PCM30 CAS framing G703P1 RxMode Selection 1 E1 G 703 E1 interface Port 1 E1 always active if G 703 IO Mode selected G703P1 RxCode Selection 0 AMI Line Coding selection HDB3 1 HDB3 G703P1 RxFrame Selection 0 Full E1 Output Framing selection PCM31 CCS 1 PCM30 CAS 2 PCM31 CCS G703P1 RxCRC4 Selection 0 Disable Cyclic Redundancy Check for Enable 1 Enable error reporting G703P1 RxNx64k Read Only Nx64kbps fractional E1 rate 512 kbps for Port 1 receiver Rev 0 11 Page G 703 6 Representation Type Entry Description Interface Parameter D
10. I Line Coding HDB3 1 HDB3 G703P2 RxFrame Selection 0 Full E1 Input Framing selection PCM 31 1 PCM30 CAS 2 PCM31 CCS G703P2 RxCRC4 Selection 0 Disable Cyclic Redundancy Check for PCM 31 CCS 1 Enable error reporting G703P2 RxNx64k Read Only Display the Nx64kbps satellite 512 kbps rate G703P2 InsMap Selection TSxx 0 Off 1 On Used for FractionalE1 mode to TS08 On xx 01 to 31 select which timeslots 1 31 Press Up Down key to toggle that are to be inserted to the between Off and On Press output E1 framed signal Left Right keys to change received over the satellite Timeslot number Press Timeslot 16 not available in enter to program all timeslots PCM30 CAS framing Alarm TstActive Selection 0 None 1 A 2 B 3 A amp B Selects destination of alarm to Alarm A Alarm BERLoss Selection 0 None 1 A 2 B 3 A amp B Selects destination of alarm to Alarm B Rev 0 11 Page G 703 7 Interface Parameter Detail when G 703 is Active Representation Alarm Enet to Alarm A Type Selection Entry O None 1 A 2 B 3 A amp B Description Selects destination of alarm Alarm E1 Port1 to Alarm Selection 0 None 1 A 2 B 3 A amp B Selects destination of alarm Alarm E1 Port2 to Alarm A Selection 0 None 1 A 2 B 3 A amp B Selects destination of alarm Test Disabled TerLoopbck Selection 0 Disable 1 Enable Interface terrestrial loop back Send
11. Loopbck to Disable 3 2 2 Modem IF Loopback If the Local Loopback test passed then test the performance of the G5 interface within the PSM 500 modem The test setup for this test is shown in Error Reference source not found The PSM 500 modem will loopback the Modulator TX IF Output back to the Demodulator RX IF input by using the Local Loopback settings on the front panel lt Dem Test gt menu Refer to the front panel configuration menus in the PSM 500 I amp O Manual and Table 1 above for setup information of all the modem functions Table 6 shows the menu selection for enabling the IF Loopback function Table 6 Front Panel IF Loopback menu Function Type Entry Description Test IFLoopbck Selection 0 Disable IF Loop back control Enable 1 Enable Rev 0 11 Page G 703 12 Verify that the BER tester is able to achieve data synchronization and there are no errors Once the test is finished remove the test mode by setting the IF Loopbck to Disable The unit is now ready for normal operation Rev 0 11 Page G 703 13
12. etail when G 703 is Active G703P1 InsMap Selection TSxx 0 Off 1 On Used for FractionalE1 mode to TS08 On xx 01 to 31 select which timeslots 1 31 Press Up Down key to toggle that are to be inserted to the between Off and On Press output E1 framed signal Left Right keys to change received over the satellite Timeslot number Press Timeslot 16 not available in enter to program all timeslots PCM30 CAS framing Port 2 G703P2 TxMode Selection 0 Disable Activate the G 703 E1 E1 1 E1 interface Port 1 G703P2 TxCode Selection 0 AMI Line Coding HDB3 1 HDB3 G703P2 TxFrame Selection 0 Full E1 Input Framing selection PCM 31 CCS 1 PCM30 CAS 2 PCM31 CCS G703P2 TxCRC4 Selection 0 Disable Cyclic Redundancy Check for PCM 31 1 Enable error reporting G703P2 TxNx64k Read Only Display the Nx64kbps satellite 512 kbps rate G703P2 DropMap Selection TSxx 0 Off 1 On Used for FractionalE1 mode to TS08 On xx 01 to 31 select which timeslots 1 31 Press Up Down key to toggle that are to be dropped from between Off and On Press the input E1 framed signal and Left Right keys to change transmitted over the satellite Timeslot number Press Timeslot 16 not available in enter to program all timeslots PCM30 CAS framing Port 2 G703P2 RxMode Selection 0 Disable Activate the G 703 E1 E1 1 E1 interface Port 1 G703P2 RxCode Selection 0 AM
13. he G5 Interface Position the rear option plate supplied into the chassis and align the mounting plate holes with the holes in the chassis rear panel Just start inserting the two 4 pan head screws without lock washers to hold the plate in place Slide the G5 interface assembly into the chassis and line up the connectors with its opening on the rear plate Slide the interface back and align the card s standoffs with the 4 standoffs in the chassis Rear Panel 4 Screws 2 Rear Connector Plate J3 amp J4 Connectors External Connector Area Ribbon Cable I 6 Mounting hole 0 156 inch DIA 4 places PS ooooooooooooooooooo Interface Option Connector S M500 Series Main PCB oooaoaooooooaoaonoooonadd Thru hole 0 10 inch DIA 2 places Location approximate 6 Mounting Screws and Locks 4 Places na ia G5 Option Card C Chassis Standoffs Figure 5 G5 Interface Installation Rev 0 11 Page G 703 11 Mount the G5 card to the chassis using the 4 6 mounting screws with lock washers An additional flat washer may be required to keep the PCB mounting screws from extending beyond the chassis bottom Tighten the rear plate mounting screws and then the PCB mounting screws Connect the upper 40 pin ribbon cable connector to the main PCB header and press down to close the latches Care must be taken to avoid bending the installed FEC card which is very close to o
14. lated with the appropriate G5 interface selection menu s Refer to Section 3 in the PSM 500 Installation and Operation Manual for instructions on how to navigate the front panel menus Selection of G 703 as the currently active interface is accomplished by using the front panel or the remote control protocols Refer to Section 2 2 below for operation via the front panel and Appendix B Rev 0 96 or higher for the remote protocol that is used to select and control the G5 interface 2 2 Configuring the G5 G 703 E1 Interface from the front panel From the front panel you would select lt Intf I O Mode gt for the G 703 option This is accomplished by pressing the Int f button to the right of the LCD display then scroll right to display I O in the upper left of the display and down if necessary to display Mode in the upper right of the display To select G 703 you can then either press and Enter or press the Edit key and scroll up or down until G 703 is displayed in the LCD lower line pressing Enter to select that option The G5 has the ability to perform local loopback from either the terrestrial data side or the satellite When used with a BERT the terrestrial loopback function allows testing of the E1 interface cables and connectors IF Loopback allows for compete modem testing by connecting the modulator output to the demodulator input Section 3 2 describes these tests in more detail
15. mode Clock Regeneration from incoming HDB3 or AMI formatted data CRC4 ON OFF modes Diagnostic Loopbacks for both Terrestrial and Satellite side e E1 alarm monitoring for all common E1 transport stream alarms LOS Loss Of Signal All Modes Als All 1 s at input port All Modes LFA Loss of Framing Alignment PCM30 CAS and PCM31 CCS LMFA Loss of Multi Frame Alignment PCM30 CAS only RAI Remote Alarm Indication PCM30 CAS and PCM31 CCS TS16AIS All 1 s in TS 16 PCM30 CAS only The G5 G 703 E1 interface is only available for PSM 500 Series of modems either new or as an upgrade to existing customer modems This optional Interface card is designed to be installed in the option interface position inside the main modem assembly 2 0 Technical Specifications 2 1 E1 Signal Structure The G 703 E1 interface operates at a nominal rate of 2 048Mbps The data transferred over the E1 transport stream is organized in frames Each E1 frame contains 256 bits which are comprised of 32 timeslots each containing eight bits The data rate of each timeslot is 64Kbps For 8 bit PCM encoded voice audio each timeslot provides for an 8 kHz sampling rate Timeslot 0 is used for frame synchronization and alarms Timeslot 16 is used for signaling alarms or data Timeslot 1 to 15 and 17 to 31 are used for carrying data or PCM encoded voice audio There are two E1 frame formats Normal frame PCM31 CCS Multi frame PCM30
16. nal The G5 supports two E1 link line codes AMI coding e HDB3 coding 2 1 5 E1 Cyclic Redundancy Check CRC The ITU standard describes an optional implementation where a 4 bit Cyclic Redundancy Check CRC4 can be used to provide error detection for Frames 0 through 7 and Frames 8 through 15 When this CRC4 format is used the even frame s International Bit is replaced with a CRC 4 bit The National Bits are relabeled as spare bits The G5 interface allows for the CRC4 function to be Enabled or Disabled 2 1 6 Other Interface Specifications Balanced 120 ohm impedance on a RJ48c Unbalanced 75 ohm impedance using an external 120 ohm to 75 ohm converter i e Balun B2S Rev 0 11 Page G 703 3 Jitter performance is in according to ITU G 823 2 1 7 Alarm Indication Signal AIS The AIS signal is an unframed all ones signal and is used to maintain line signal synchronization in case of loss of input signal The G5 interface will provide an AIS on the receive data line if there is a fault condition in the demodulator There will also be an indication on the G5 interface if there is an AIS condition received on the transmit data line 3 0 G5 Setup and Operation The addition of a the G5 interface card provides G 703 E1 physical and electrical interfaces designed to operate at 2 048 Mbps When installed the G5 interface card is automatically recognized by the PSM 500 modem controller and the user interface menus are popu
17. ne latch Re install the cover and plug the unit in Using the front panel arrow keys scroll down to the interface parameter and verify that the modem recognizes the newly installed card The modem is now ready to be put into service 3 2 Physical Connectivity Tests The following tests will verify the proper installation and performance of the G5 card within the PSM 500 modem Connectivity and performance will require the use of a Bit Error Rate Tester Fireberd or similar with an E1 and or Fractional E1 interface 3 2 1 Local Loopback This first test checks the local interfaces and cable and does not require a satellite link or other earth station equipment The G5 interface will loopback the transmit input data back out on the receive data port by using the Local Loopback settings on the front panel lt Intf Test gt menu Refer to the front panel configuration menus in the PSM 500 I amp O Manual and Table 1 above for setup information of all the modem functions Table 5 shows the menu selection for enabling the local terrestrial loopback function Table 5 Front Panel Terrestrial Loopback menu Function Type Entry Description Test TerLoopbck Selection 0 Disable1 Enable Interface terrestrial Enable loop back Send Data input to Receive Data output Verify that the BER tester is able to achieve data synchronization and there are no errors Once the test is finished remove the test mode by setting the Ter
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