Comtech EF Data SNM-1001L Installation And Operation Manual page 11

SNM-1001L Satellite Modem
Preface
12.2 Variable Data Rates .................................................................................................................. 12-5
BUC FSK COMMUNICATIONS ....................................................................13-1
CHAPTER 13.
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
SPECIFICATION ............................................................................................ A-1
APPENDIX A
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
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MN/SNM1001L.IOM