Comtech EF Data SNM-1001L - Manual (Page 11)

SNM-1001L Satellite Modem Revision 1
Preface MN/SNM1001L.IOM
vi
12.2 Variable Data Rates.................................................................................................................. 12–5
CHAPTER 13. BUC FSK COMMUNICATIONS ....................................................................13–1
13.1 Introduction............................................................................................................................... 13–1
13.1.1 Transmission Interface........................................................................................................ 13–2
13.2 Message Structure..................................................................................................................... 13–2
13.2.1 Command Message Structure (IDU to ODU)..................................................................... 13–2
13.2.2 Response Message Structure (BUC to IDU)....................................................................... 13–3
13.3 Power Class................................................................................................................................ 13–3
CHAPTER 14. DECODER...................................................................................................14–1
14.1 Decoder ...................................................................................................................................... 14–1
14.1.1 Sequential Decoder ............................................................................................................. 14–1
14.1.2 Viterbi Decoder................................................................................................................... 14–3
CHAPTER 15. REED-SOLOMON CODEC .........................................................................15–1
15.1 Reed-Solomon Codec ................................................................................................................ 15–1
15.1.1 Specifications...................................................................................................................... 15–2
15.1.2 Theory of Operation............................................................................................................ 15–2
15.1.3 Reed-Solomon Encoder ...................................................................................................... 15–3
15.1.4 Reed-Solomon Decoder ...................................................................................................... 15–5
APPENDIX A SPECIFICATION ............................................................................................ A–1
A.1 Specifications .............................................................................................................................. A–1
A.2 Specification Summary.............................................................................................................. A–2
A.3 L-Band Modulator Specification Summary ............................................................................ A–3
A.4 Demodulator Specification Summary ...................................................................................... A–4
A.5 L-Band Modulator Specifications............................................................................................. A–5
A.5.1 Digital Data Rate.................................................................................................................. A–5
A.5.2 Modulation and Encoding Types ......................................................................................... A–6
A.5.3 Scrambling Types ................................................................................................................ A–7
A.5.4 Modulator Frequency Reference.......................................................................................... A–7
A.5.5 Modulator Spurious Emissions ............................................................................................ A–8
A.5.6 Modulator Phase Noise ........................................................................................................ A–8
A.5.7 Modulator IF Output Spectrum Shape ................................................................................. A–8
A.5.8 L-Band INMARSAT Spurious Emissions ........................................................................... A–8
A.5.9 Differential Encoder............................................................................................................. A–9
A.5.10 BPSK Bit Ordering .............................................................................................................. A–9