Comtech EF Data SDM-300A - Manual (Page 11)

SDM-300A Satellite Modem Revision 6
Preface MN/SDM300A.IOM
vii
CHAPTER 9. FORWARD ERROR CORRECTION (OPTIONS) .......................................................................9–1
9.1 Introduction.................................................................................................................................................9–1
9.2 Viterbi...........................................................................................................................................................9–2
9.3 Sequential....................................................................................................................................................9–3
9.4 Reed-Solomon Outer Codec ......................................................................................................................9–4
9.4.1 Closed Network Modes ........................................................................................................................9–5
9.4.2 Open Network Modes ..........................................................................................................................9–5
9.5 Trellis Coding (FAST Option).....................................................................................................................9–6
9.6 Turbo Product Codec (Hardware Option) .................................................................................................9–7
9.6.1 Introduction .........................................................................................................................................9–7
9.6.2 End-to-End Processing Delay ..............................................................................................................9–7
9.6.3 Comparison of all TPC Modes .........................................................................................................9–8
9.7 Uncoded Operation (No FEC) ....................................................................................................................9–9
CHAPTER 10. OPEN NETWORK OPERATIONS ............................................................................................10–1
10.1 Introduction...............................................................................................................................................10–1
10.2 Intelsat Business System (IBS) ...............................................................................................................10–1
10.2.1 IBS Specification ................................................................................................................................10–4
10.2.2 IBS Modem Defaults ..........................................................................................................................10–5
10.2.3 IBS Primary Data Interface.................................................................................................................10–6
10.2.4 IBS Clock and Dejitter ........................................................................................................................10–6
10.2.5 IBS Framing .......................................................................................................................................10–6
10.2.6 IBS Engineering Service Channel......................................................................................................10–6
10.2.7 IBS Scrambling ..................................................................................................................................10–6
10.3 Intermediate Data Rate (IDR)....................................................................................................................10–7
10.3.1 IDR Specification..............................................................................................................................10–10
10.3.2 IDR Modem Defaults........................................................................................................................10–11
10.3.3 IDR Primary Data Interface ..............................................................................................................10–12
10.3.4 IDR Framing.....................................................................................................................................10–12
10.3.5 IDR Engineering Service Channel....................................................................................................10–12
10.4 Drop and Insert (D&I)..............................................................................................................................10–13
10.4.1 D&I Specification..............................................................................................................................10–14
10.4.2 Theory of Operation .........................................................................................................................10–18
10.4.3 Data Interference .............................................................................................................................10–18
10.4.4 Transmitted MUX .............................................................................................................................10–18
10.4.5 Receive DEMUX ..............................................................................................................................10–19
10.4.6 Plesiochronous
Buffer ......................................................................................................................10–19
10.4.7 Engineering Service Channel...........................................................................................................10–20
10.4.8 Backward Alarm ...............................................................................................................................10–20