Comtech EF Data CDM-600 Installation And Operation Manual page 22

CDM-600 Satellite Modem
Preface
7.2 Viterbi .......................................................................................................................................... 7-1
7.3 Sequential..................................................................................................................................... 7-2
7.4 Reed-Solomon Outer Codec....................................................................................................... 7-3
7.5 Trellis Coding (FAST Option) ................................................................................................... 7-5
7.6 Turbo Product Codec (Hardware Option) ............................................................................... 7-6
7.7 TPC and Low Density Parity Check (LDPC) coding .............................................................. 7-6
7.7.1 Introduction........................................................................................................................... 7-6
7.7.2 LDPC versus TPC................................................................................................................. 7-7
7.7.3 End-to-End Processing Delay ............................................................................................... 7-9
7.8 Uncoded Operation (No FEC) ................................................................................................. 7-11
CHAPTER 8. OFFSET QPSK OPERATION .........................................................................8-1
CHAPTER 9. OPEN NETWORK OPERATIONS ..................................................................9-1
9.1 Introduction................................................................................................................................. 9-1
9.2 IBS ................................................................................................................................................ 9-1
9.2.1 IBS Clock/data recovery and De-jitter.................................................................................. 9-2
9.2.2 IBS Framing.......................................................................................................................... 9-2
9.2.3 IBS Engineering Service Channel......................................................................................... 9-2
9.2.4 IBS Scrambling ..................................................................................................................... 9-2
9.3 Drop and Insert ........................................................................................................................... 9-2
9.3.1 D&I Primary Data Interfaces ................................................................................................ 9-3
9.3.2 D&I Framing......................................................................................................................... 9-3
9.4 IDR ............................................................................................................................................... 9-4
9.4.1 IDR Primary Data Interfaces................................................................................................. 9-5
9.4.2 IDR Engineering Service Channel ........................................................................................ 9-5
CHAPTER 10. CLOCK MODES AND DROP AND INSERT (D&I) ....................................10-1
10.1 Transmit Clocking .................................................................................................................... 10-1
10.1.1 Internal Clock...................................................................................................................... 10-1
10.1.2 Tx Terrestrial ...................................................................................................................... 10-2
10.1.3 Rx Loop-Timed, RX=TX.................................................................................................... 10-2
10.1.4 Rx Loop-Timed, RX<>TX (Asymmetric Loop Timing).................................................... 10-2
10.1.5 External Clock .................................................................................................................... 10-2
10.2 Receive Clocking ....................................................................................................................... 10-3
10.2.1 Buffer Disabled (RX Satellite)............................................................................................ 10-3
10.2.2 Buffer Enabled, TX=RX (TX Terrestrial or External Clock) ............................................. 10-3
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Revision 7
MN/CDM600.IOM