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1. G1 133 octal CCSDS convolutional encoder with puncturing Rates other than 2 are implemented by puncturing the rate 2 encoded data stream The puncturing pattern is as follows 1 denotes transmission 0 blocking 10101 11010 1000101 1111010 Gi G 110 Gi Gi K 9 R 1 3 The generator polynomials for K 9 R 1 3 are Go x 1 EK FX IX IN E FA GAR LAKAR FXI F 4x2 G x 1 x x x x K 9 R 1 2 3 The generator polynomials for K 9 R 1 2 are Ga SN PKK Er AKAK E Gis ee x x x The rate 2 3 is implemented by puncturing the rate 1 2 encoded data stream The puncturing pattern is as follows 1 denotes transmission 0 blocking Rate 2 3 Go 11 G 01 Differential Encoding Differential encoding can be used prior to FEC encoding as specified in Intelsat IESS 308 309 This feature can be enabled disabled by software gt gt A D lt Treillis Coded Modulation TCM Encoder As per Intelsat IESS 310 for rate 2 3 8 PSK differential encoder 1 o differential o Fe encoder 2 A a gt Q 0 gt e N Bu gt D D DD DDD R D lt differential encoder2. M amp C RX 01001702 dsf Maximum height 0 500 JTAGTDO JTAGTMS JTAGTCK GND gt U M N O O Pinout I O Compatibility List not an exhaustive list Serial Link P1 The DB 9 connector is wired as data circuit terminating equipment DCE Connection to a PC COM 5003 COM 1002 BPSK QPSK OQPSK is over a straight through cable No null modem or TCP IP USB digital modulator gender changer is required Gateway COM 1006 COM 1012 1019 DSSS digital Reed Solomon modulator 9 1 encoder N eet 2 Transmit COM 1028 T 3 Receive FSK MSK GFSK GMSK digital 9 6 5 Ground modulator DB 9 Female COM 1023 BER generator Additive White Gaussian Noise Generator COM 1009 Viterbi decoder back to Input Connector J2 Men ewa ane g CLK IN SAMPLE CLKUIN DATA IN e z ee ComBlock Ordering Information 06 GND SOF_RESET l SAMPLE_CLK_IN REQ COM 1010 Convolutional Encoder 6 e ga NG MSS 4 18221 Flower Hill Way A e e Gaithersburg Maryland 20879 e U S A ee Telephone 240 631 1111 oa Facsimile 240 631 1676 GND E mail sales comblock com M amp CRX MactTx JTAG TDI JTAGTMS JTAGTCK GND gt U MN N O O
3. MHz For the latest data sheet please refer to the ComBlock Output Module Definition web site www comblock com download com1010 pdf Interface These specifications are subject to change without notice DATA_OUT 3 0 Output data stream Can be one bit serial 2 3 4 bit For an up to date list of ComBlock modules please parallel depending on the refer to www comblock com product_list htm Pa on 2 bit parallel typically used for 1 Q QPSK modulation 3 bit parallel typically used for 8 PSK modulation 4 bit parallel typically used for 16 PSK modulation MSS e 18221 Flower Hill Way A Gaithersburg Maryland 20879 U S A Telephone 240 631 1111 Facsimile 240 631 1676 www ComBlock com MSS 2000 2006 Issued 1 14 2006 1 block mode SAMPLE_CLK_OUT Output symbol clock One REGO bit 6 CLK wide pulse Read the Output sample 00 1 bit serial output signals at the rising format 01 2 bit parallel I Q for connection edge of CLK when to QPSK modulator SAMPLE_CLK_OUT l 10 3 bit parallel for connection to 8 SAMPLE_CLK_OUT_REQ One CLK wide pulse input PSK modulator Requests for a sample from 11 4 bit parallel for connection to 16 the module downstream PSK modulator For flow control purposes This field is ignored when TCM mode Serial Monitoring amp DB9 connector is selected Control 115 Kbaud s 8 bit no REG bits 1 0 parity one stop bit No flow Internal pattern 00 test mode disabled control gen
4. Com Block COM 1010 CONVOLUTIONAL ENCODER Key Features MMSE ET aisr 1 ie e Convolutional encoder for error correction e Selectable rate and constraint length K 5 rate 1 7 K 7 rates 12 2 3 34 5 6 7 8 K 9 rates 1 3 2 3 e Treillis Coding Modulation TCM encoder Rate 2 3 8 PSK Rate 34 16 PSK EAT a aane pea ani A Electrical Interface e Continuous or Block mode operation e Support for the following standards Interface Intelsat IESS 308 309 Intelsat IESS 310 SAMPLE_CLK_IN Input signal sampling clock DVB ETS 300 421 One CLK wide pulse Read DVB ETS 300 744 the input signal at the rising CCSDS 101 0 B 6 edge of CLK when SAMPLE _CLK_IN I e Differential encoder SAMPLE_CLK_IN_REQ One CLK wide pulse output e Maximum throughput at output 40 Mbps Requests a sample from the e On board or external clock selection ah d aaa control purposes l SOF_RESET Optional start of frame reset e ComScope enabled key internal input Used only in block signals can be captured in real time and mode Ignored in continuous displayed on host computer mode CLK wide pulse e Single 5V supply Connectorized 3 x 3 Aligned with module for ease of prototyping Standard 40 pin 2mm dual row connectors left right bottom Interfaces with 5V and 3 3V SAMPLE_CLK_IN Input reference clock for synchronous I O and i processing Yields internal logic CLK clock Maximum frequency fax 1s 40
5. LK SAMPLE CLK OUT __ 2 bits 2 bits DATA_OUT 0 1 0 1 1 Output timing example rate 1 2 serial output mode 2 output bits for every input bit 02005801 dsf Output samples can be bursty depending on the FEC rate selected The diagram above illustrates the output sampling clock for rate R serial output mode The next ComBlock module recognizes that multiple output bits are sent in each burst as it reads the output at the rising edge of CLK when SAMPLE CLK OUT l Mechanical Interface 5VDC Power Serial Link yi n Terminal DB 9 Female aid cena Block 90deg 90 deg DCE b Output Connectors J3 J4 Mounting hole LO GND 5V O 0 160 2 840 Pa N gt UJ KAN U1 P1 Mounting hole 2 840 2 840 A1 pin 0 100 2 250 CLK_OUT SAMPLE CLK OUT b DATA_OUT 0 DATA_OUT 1 w DATA_OUT 2 DATA_OUT 3 TI A1 pin 2 900 2 250 ee Input signals J2 Op view J3 Output A pi i 2 rows x 20 pin 2 rows x 20 pin GND female 90 deg male 90 deg e ew ee SAMPLE CLK OUT REG ca oe e ee Mounting hole ie TP z 0 160 0 160 99000 J4 6 GND Bin 10 B20 B1 ax Qa a YO A20 N A1 if N T Corner 0 000 0 000 Output B Mounting hole _ 2rowsx20pin 2 840 0 160 male 90 deg aa e V A1 pin 2 250 0 100 GND Mounting hole diameter 0 125 e A1 pin height 0 039 M amp C TX 6
6. TCM encoder rate 2 3 for 8 PSK differential encoder 1 differential encoder 2 differential encoder3 AN Q o differential gt A encoder 4 A e gt R 0O gt Q gee gt D DB D D DDD D lt ce ig T cb gt differential encoder TCM encoder rate 3 4 for 16 PSK Flow Control In most applications the data samples are pulled from the end module which is the timing reference This is the case for example when the reference real time clock is the modulation rate By pulled we mean that the data processing is going downstream whereby the clock requests are going in the opposite direction In order to cater to this requirement the COM 1010 module includes a built in numerically controlled oscillator which generates the SAMPLE_CLK_IN_REQ output based on the SAMPLE _CLK_OUT_REQ input For example if a rate 4 puncturing is selected together with a 1 bit serial output the NCO will generate 3 SAMPLE_CLK_IN_REQ output pulses for every 4 SAMPLE_CLK_OUT_REQ input pulses Timing The I O signals are synchronous with the rising edge of the reference clock CLK e all signals transitions always occur after the rising edge of the reference clock CLK The maximum CLK frequency is 40 MHz Input Input read at rising edge of CLK Pa y CLK SAMPLE_CLK_IN _ ae a DATA IN Output C
7. eration test Power Interface 4 75 5 25VDC Terminal mode 01 counting sequence block Power consumption When set the baseband input is disabled is approximately and a periodic pattern is internally proportional to the CLK generated at the encoder input The frequency The maximum pattern consists of an 8 bit counter power consumption at 40 MSB transmitted first MHz is 300mA 10 PRBS 11 internal generation of 2047 bit periodic pseudo random bit Configur ation via Serial Link sequence as modulator input overrides external input bit stream LA N Useful in measuring BER performances Complete assemblies can monitored and controlled in conjunction with COM 1005 centrally over a single serial or LAN connection l l l The test pattern bit rate is automatically set by the external sink module typically a modulator as part of the flow control mechanism The module configuration parameters are stored in non volatile memory All control registers are read write REG I bits 3 2 Output symbol In most cases the COM 1010 Constraint 0000 K 5 R 1 7 rate internal throughput is determined by modules length K and 0001 K 7 R 1 2 Intelsat external downstream for example a modulator rate R 0010 K 7 R 2 3 Intelsat selection There are however cases when the 0011 K 7 R 3 4 Intelsat throughput is set using an internal NCO 0100 K 7 R 5 6 Intelsat for example when testing convolutiona
8. l 0101 K 7 R 7 8 Intelsat encoder and Viterbi decoder back to 0110 K 9 R 1 3 back 0111 K 9 R 1 2 1000 K 9 R 2 3 0 exter nal Output symbol rate is 1001 TCM K 7 R 2 3 based on SAMPLE_CLK_OUT_REQ 1010 TCM K 7 R 3 4 samples requests from following module 1011 K 7 R 1 2 CCSDS 1100 K 7 R 2 3 CCSDS 1 internal Output symbol rate is 1101 K 7 R 3 4 CCSDS selected internally by the NCO 1110 K 7 R 5 6 CCSDS frequency set in REG2 3 4 Sample 1111 K 7 R 7 8 CCSDS requests SAMPLE_CLK_OUT_REQ REGO bits 4 1 are ignored Differential 0 disabled Encoding 1 enabled REGI bit 4 REGO bit 5 Output symbol Internal generation of the output symbol Continuous Determines whether the SOF RESET rate NCO rate Ignore this field when the output Block mode mode should be enabled for resetting symbol rate is determined by modules the encoder at the start of a block downstream 0 continuous 24 bit signed integer 2 s complement 2 representation expressed as fsymbol rate a fax The internal processing clock fax is typically 40 MHz REG2 bits 7 0 LSB REG3 bits 15 8 REG4 bits 23 16 MSB Baseline configurations can be found at www comblock com tsbasic_settings htm and imported into the ComBlock assembly using the ComBlock Control Center File Import menu Monitoring via Serial Link LAN Monitoring registers are read only Paramete
9. pe probe Point Output serial stream bit clock Output serial stream data TP5 Start of the periodic LFSR 11 2047 bit test pattern Implementation K 5 The generator polynomials for K 5 R 1 7 is Go x 1 ike Kk x Gi x 14 x x x Go x 1 x x G3 x 1 x x x Gix 14 x4 x 4 x G x 1 KK AKIK GR 1 x x x 4 x K 7 Intelsat The generator polynomials for K 7 R are G x 1 x x x x Gi x 1 x x x x 133 octal and 171 octal The implementation is depicted below GO 133 octal gt D D ID ID ID ID ID Puncturing TAN ATN ZTN G1 171 octal Rates other than 2 are implemented by puncturing the rate 2 encoded data stream The puncturing pattern is as follows 1 denotes transmission 0 blocking K 7 CCSDS The generator polynomials for K 7 R are G x 1 x x x x Gi x 1 x x x x 171 octal and 133 octal The implementation is depicted below Rate 2 3 10 11 6 Rate 7 8 GO 171 octal gt gt D D ID ID ID ID ID G1 133 octal Basic CCSDS convolutional encoder The basic encoder inverts the G output When using puncturing this inverter is removed GO 171 octal gt D D DDD DD Puncturing ex ao
10. rs Monitoring Option o Returns 10100v when prompted for Version v option o and version v numbers ComScope Monitoring Key internal signals can be captured in real time and displayed on a host computer using the ComScope feature of the ComBlock Control Center The COM 1010 signal traces and trigger are defined as follows Buffer length Format Nominal sampling rate Samples or test pattern bit 2 Output symbol Binary processing 4096 clock fak request internally set by NCO or externally by Format Nominal Capture sampling length rate samples clock fa 2 Output bit Binary 1 4096 stream sample bit Format Nominal Capture sampling rate SAMPLE _CLK_ DATA_OUT O length Binary 4096 Trace 1 signals Trace 2 signals OUT_REQ Trace 3 signals Samples SAMPLE CLK __ clock fu IN_REQ 2 Binary processing 4096 SAMPLE_CLK_OUT clock fax 1 Start of binary internal PRBS11 test sequence 2 SOF_RESET Signals sampling rates can be changed under software control by adjusting the decimation factor and or selecting the fy processing clock as real time sampling clock In particular selecting the fax processing clock as real time sampling clock allows one to have the same time scale for all signals The ComScope user manual is available at www comblock com download comscope pdf Test Points Test points are provided for easy access by an oscillosco
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