Comtech EF Data SDM-300A - Manual (Page 14)

SDM-300A Satellite Modem Revision 6
Preface MN/SDM300A.IOM
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19.4.4 Differential Encoder............................................................................................................................19–8
19.4.5 BPSK BIT Ordering ............................................................................................................................19–8
19.4.6 Interleaver (Reed-Solomon Codec)....................................................................................................19–8
19.4.7 Transmit Frequency (IF).....................................................................................................................19–9
19.4.8 Frequency Reference.........................................................................................................................19–9
19.4.9 Transmit Frequency Change Time.....................................................................................................19–9
19.4.10 Phase Noise.......................................................................................................................................19–9
19.4.11 Transmit IF Output Switch................................................................................................................19–10
19.4.12 Transmit IF Power............................................................................................................................19–10
19.4.13 Modulator Power Offset ...................................................................................................................19–10
19.4.14 Modulated IF Output Shape .............................................................................................................19–10
19.4.15 Spurious Emissions..........................................................................................................................19–10
19.4.16 Modulator Phase Error .....................................................................................................................19–10
19.4.17 Transmit IF Test Modes ...................................................................................................................19–11
19.4.18 Modulator Spectrum Rotation...........................................................................................................19–11
19.5 Demodulator Specifications...................................................................................................................19–12
19.5.1 Digital Data Rate ..............................................................................................................................19–12
19.5.2 Demodulation and FEC Decoding Types .........................................................................................19–13
19.5.3 Descrambling Types ........................................................................................................................19–14
19.5.4 Differential Encoder..........................................................................................................................19–14
19.5.5 BPSK BIT Ordering ..........................................................................................................................19–14
19.5.6 Deinterleaver (Reed-Solomon Codec) .............................................................................................19–15
19.5.7 Demodulator Spectrum Rotation......................................................................................................19–15
19.5.8 Frequency Reference.......................................................................................................................19–15
19.5.9 Transmit Frequency Change Time...................................................................................................19–15
19.5.10 Phase Noise.....................................................................................................................................19–15
19.5.11 Transmit IF Output Switch................................................................................................................19–15
19.5.12 Demodulator IF Input Shape ............................................................................................................19–16
19.5.13 Channel Spacing/Adjacent Carrier Performance..............................................................................19–16
19.6 BER Performance Specifications ..........................................................................................................19–16
19.6.1 Performance with Noise, Viterbi Decoder, and Open Network Mode...............................................19–17
19.6.2 Performance with Noise, Viterbi Decoder, and Closed Network ......................................................19–17
19.6.3 Performance with Noise, Viterbi Decoder, and Reed-Solomon (Optional).......................................19–18
19.6.4 Performance with Noise, 56 kbps and Sequential Decoder (Optional) ............................................19–18
19.6.5 Performance with Noise, 1544 kbps and Sequential Decoder .........................................................19–19
19.6.6 Performance with Noise at 1544 kbps, Sequential Decoder, and Reed-Solomon ..........................19–19
19.6.7 8-PSK Performance with Noise and With/Without Reed-Solomon...................................................19–20
19.6.8 Performance with Noise, Viterbi Decoder, and Offset QPSK...........................................................19–20
19.6.9 Performance with Noise, Uncoded (1/1) BPSK, QPSK, and Offset QPSK.......................................19–21
19.6.10 Performance with Noise Turbo Product Codec (Optional) ...............................................................19–21
19.6.11 BER Threshold.................................................................................................................................19–21
19.7 Acquisition Time .....................................................................................................................................19–22
19.7.1 Receive IF Carrier Acquisition Range ..............................................................................................19–22
19.7.2 Receive IF Carrier Reacquisition......................................................................................................19–22
19.7.3 AGC Output......................................................................................................................................19–24