Comtech EF Data SDM-9000 - Manual (Page 17)

SDM-9000 Satelite Modem Preface
Rev. 4 ix
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
Tables
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 Eb/N0 Chart (QPSK)............................................................................................... 6–5
Table 6-2. Conversion to S/N and Eb/N0 Chart (8PSK)................................................................................................ 6–6
Table 6-3. Conversion to S/N and Eb/N0 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