Comtech EF Data SNM-1001L - Manual (Page 12)

SNM-1001L Satellite Modem Revision 1
Preface MN/SNM1001L.IOM
vii
A.5.11 Interleaver (Reed-Solomon Codec)...................................................................................... A–9
A.5.12 Modulator Transmit Frequency (IF) .................................................................................... A–9
A.5.13 Transmit Frequency Change Time....................................................................................... A–9
A.5.14 Modulator Transmit IF Output Switch................................................................................. A–9
A.5.15 Modulator Transmit IF Power.............................................................................................. A–9
A.5.16 Modulator Power Offset..................................................................................................... A–10
A.5.17 Modulator I / Q Imbalance................................................................................................. A–10
A.5.18 Modulator Output Noise Floor........................................................................................... A–10
A.5.19 Modulator Spectrum Rotation............................................................................................ A–10
A.5.20 Modulator Output Return Loss .......................................................................................... A–10
A.5.21 L-Band ODU Reference Signal ......................................................................................... A–10
A.5.22 L-Band ODU Control and Monitor.................................................................................... A–10
A.5.23 Modulator Transmit IF Test Modes ................................................................................... A–10
A.5.24 L-Band ODU Supply Voltage............................................................................................ A–11
A.5.25 ODU DC Current Sense..................................................................................................... A–11
A.6 Encoding ................................................................................................................................... A–11
A.6.1 BPSK Encoding ................................................................................................................. A–11
A.6.2 OQPSK Encoding .............................................................................................................. A–12
A.6.3 8-PSK Encoding................................................................................................................. A–12
A.7 L-Band Demodulator Specifications ...................................................................................... A–13
A.7.1 Digital Data Rate................................................................................................................ A–13
A.7.2 Demodulation and FEC Decoding Types .......................................................................... A–14
A.7.3 Descrambling Types .......................................................................................................... A–15
A.7.4 Differential Decoder .......................................................................................................... A–15
A.7.5 BPSK Bit Ordering ............................................................................................................ A–15
A.7.6 Deinterleaver (Reed-Solomon Codec) ............................................................................... A–15
A.7.7 Demodulator Spectrum Rotation ....................................................................................... A–15
A.7.8 Receive Frequency............................................................................................................. A–16
A.7.9 Input Overload ................................................................................................................... A–16
A.7.10 Demodulator Input Return Loss......................................................................................... A–16
A.7.11 LNB Prime Power.............................................................................................................. A–16
A.7.12 LNB Band Control............................................................................................................. A–16
A.7.13 LNB Reference Signal ....................................................................................................... A–16
A.7.14 Receive Input Power (Composite) ..................................................................................... A–17
A.7.15 Demodulator Input Shape .................................................................................................. A–17
A.7.16 Receive Input Power (Desired Carrier).............................................................................. A–18
A.7.17 Demodulator Channel Spacing/Adjacent Carrier Performance ......................................... A–18
A.8 Bit Error Rate Performance ................................................................................................... A–19
A.8.1 Performance With Noise, Viterbi Decoder, and Closed Network ..................................... A–19
A.8.2 Performance with Noise, Viterbi Decoder, and Reed-Solomon (Optional).................... A–19
A.8.3 Performance With BPSK and {O}QPSK BER Performance ............................................ A–19
A.8.4 Performance with Noise Turbo Product Codec (Optional)................................................ A–20
A.8.5 Performance With Noise, 1544 kbps Sequential Decoder and Reed Solomon(Optional) A–20
A.8.6 Performance With Noise, 56 kbps Sequential Decoder (Optional) ................................... A–20
A.8.7 Performance With Noise, 1544 kbps Sequential Decoder (Optional) ............................... A–21
A.8.8 BER Threshold................................................................................................................... A–21