Comtech EF Data SDM-9000 Installation And Operation Manual page 17

SDM-9000 Satelite Modem
Figure 6-4. Typical Eye Constellations ..................................................................................................................... 6-9
Figure 6-5. Interface PCB Test Points ....................................................................................................................... 6-10
Figure 6-6. Modulator PCB Test Points .................................................................................................................... 6-11
Figure 6-7. Demodulator PCB Test Points ................................................................................................................ 6-12
Figure A-1. Reed-Solomon Codec Block Diagram ................................................................................................... A-1
Figure A-2. Reed-Solomon Encoder Section Block Diagram ................................................................................... A-2
Figure A-3. Reed-Solomon Codec Frame Format ..................................................................................................... A-4
Figure A-4. Reed-Solomon Decoder Section Block Diagram ................................................................................... A-5
Figure A-5. Reed-Solomon Installation..................................................................................................................... A-9
Figure A-6. Block Diagram of SDM-9000 Configured for DBS/DVB Operation .................................................... A-11
Figure A-7. Typical Differential ECL Receiver and Driver ...................................................................................... A-12
Figure A-8. Typical Differential PECL Receiver and Driver .................................................................................... A-13
Figure A-9. DBS Mode Baseband Packet ................................................................................................................. A-14
Figure A-10. Timing for Transmit Baseband Interface ............................................................................................. A-15
Figure A-11. DBS Mode TX SYNC Pulse Timing ................................................................................................... A-16
Figure A-12. Timing for Receive Baseband Interface............................................................................................... A-16
Figure A-13. DBS Mode Receive SYNC Pulse Timing............................................................................................ A-17
Figure A-14. DBS Mode Receive with Extended SYNC .......................................................................................... A-17
Figure A-15. Scrambler/Descrambler........................................................................................................................ A-19
Figure A-16. DBS Scrambler Sequence .................................................................................................................... A-20
Figure A-17. Reed-Solomon RS(204,188,8) Error-Protected Packet ........................................................................ A-21
Figure A-18. Interleaver/De-interleaver .................................................................................................................... A-23
Figure A-19. Interleaved Frame Structure ................................................................................................................. A-24
Figure A-20. DVB Puncturing................................................................................................................................... A-25
Figure A-21. QPSK Constellation ............................................................................................................................. A-27
Figure A-22. QPSK (1/2, 3/4, 7/8 Rates) with Reed-Solomon (DVB)...................................................................... A-30
Table 1-1. SDM-9000 Specifications............................................................................................................................. 1-10
Table 1-2. Viterbi Decoder BER Data ........................................................................................................................... 1-12
Table 1-3. Reed-Solomon BER Data ............................................................................................................................. 1-14
Table 1-4. 8PSK and 16QAM BER Data....................................................................................................................... 1-16
Table 2-1. Modem Rear Panel Connectors .................................................................................................................... 2-5
Table 3-1. Display/M&C PCB Jumper Settings ............................................................................................................ 3-2
Table 3-2. Modulator PCB Jumper Settings .................................................................................................................. 3-3
Table 3-3. Demodulator PCB Jumper Settings .............................................................................................................. 3-4
Table 3-4. Interface Configuration Jumper Settings ...................................................................................................... 3-5
Table 3-5. SDM-9000 Revision Emulation.................................................................................................................... 3-14
Table 3-6. Modem Defaults ........................................................................................................................................... 3-16
Table 6-1. Conversion to S/N and E b /N 0 Chart (QPSK)............................................................................................... 6-5
Table 6-2. Conversion to S/N and E b /N 0 Chart (8PSK)................................................................................................ 6-6
Table 6-3. Conversion to S/N and E b /N 0 Chart (16QAM)............................................................................................ 6-7
Table 6-4. SDM-9000 Modem Fault Tree ..................................................................................................................... 6-15
Table A-1. Electrical Characteristics of ECL and PECL Interface Types ..................................................................... A-13
Table A-2. TX Baseband Interface Timing.................................................................................................................... A-15
Table A-3. Receive Baseband Interface Timing ............................................................................................................ A-17
Table A-4. Rate Exchange Ratios for DVB Puncturing................................................................................................. A-26
Table A-5. Reed-Solomon BER Data ............................................................................................................................ A-29
Rev. 4
Tables
Preface
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