Comtech EF Data SDM-9000 - Manual (Page 15)

SDM-9000 Satelite Modem Preface
Rev. 4 vii
A.2.1 Requirements ................................................................................................................................................... A–11
A.2.2 Baseband Physical Interfaces........................................................................................................................... A–12
A.2.2.1 ECL Physical Interface............................................................................................................................. A–12
A.2.2.2 PECL Physical Interface........................................................................................................................... A–13
A.2.3 DBS Baseband Interface .................................................................................................................................. A–14
A.2.3.1 DBS TX Baseband Interface .................................................................................................................... A–14
A.2.3.2 DBS RX Baseband Interface .................................................................................................................... A–14
A.2.4 Baseband Interface Requirements.................................................................................................................... A–15
A.2.4.1 Timing for Transmit Baseband Interface.................................................................................................. A–15
A.2.4.1.1 DBS Mode TX SYNC Pulse Timing ................................................................................................ A–16
A.2.4.2 Timing for Receive Baseband Interface ................................................................................................... A–16
A.2.4.2.1 DBS Mode Receive SYNC Pulse Timing ......................................................................................... A–17
A.2.5 SYNC Decoder (Correlater) ............................................................................................................................ A–18
A.2.5.1 DBS Mode SYNC Decoder for 204-Byte Packets ................................................................................... A–18
A.2.5.1.1 TX Functions of the DBS Mode SYNC Decoder ............................................................................. A–18
A.2.5.1.2 RX Functions of the DBS Mode SYNC Decoder ............................................................................. A–18
A.2.6 SYNC 1 Inversion and Scrambler/Descrambler .............................................................................................. A–19
A.2.6.1 DBS Mode (De)Scrambler for 204-Byte Packets..................................................................................... A–20
A.2.7 Reed-Solomon Coder/Decoder ........................................................................................................................ A–21
A.2.7.1 DBS Mode Check Byte Framing for 204-Byte Packets ........................................................................... A–22
A.2.8 Depth 12 Interleaver/De-interleaver ................................................................................................................ A–23
A.2.9 Inner Coder/Decoder........................................................................................................................................ A–25
A.2.9.1 Punctured Operation ................................................................................................................................. A–25
A.2.9.2 Signal Space Mapping .............................................................................................................................. A–27
A.2.10 Nyquist Filters................................................................................................................................................ A–28
A.2.11 DVB with Reed-Solomon BER (QPSK) ....................................................................................................... A–29
A.3 ESC 64 kbit/s Data Option ................................................................................................................................... A–31
APPENDIX B. REMOTE CONTROL OPERATION .......................................................... B–1
B.1 General ................................................................................................................................................................... B–1
B.2 Message Structure ................................................................................................................................................. B–2
B.2.1 Start Character ................................................................................................................................................. B–2
B.2.2 Device Address ................................................................................................................................................ B–2
B.2.3 Command/Responses ....................................................................................................................................... B–3
B.2.4 End Character................................................................................................................................................... B–3
B.3 Configuration Commands/Responses.................................................................................................................. B–4
B.3.1 Modulator......................................................................................................................................................... B–4
B.3.2 Demodulator .................................................................................................................................................... B–5
B.3.3 Interface ........................................................................................................................................................... B–6
B.3.4 System.............................................................................................................................................................. B–9
B.4 Status Commands/Responses ............................................................................................................................... B–10
B.4.1 Configuration ................................................................................................................................................... B–10
B.4.2 Error Performance............................................................................................................................................ B–15
B.5 Stored Faults .......................................................................................................................................................... B–19
GLOSSARY ...................................................................................................................... g-1