Comtech EF Data SDM-300L3, Инструкция по установке и эксплуатации

Страница: 10 / 408

SDM-300L3 Satellite Modem Revision 1
Preface MN/SDM300L3.IOM
viii
14.5 L-Band Modulator Specifications ............................................................................ 14–6
14.5.1 Digital Data Rate .................................................................................................................14–6
14.5.2 Modulation and Encoding Types .........................................................................................14–8
14.5.3 Scrambling Types................................................................................................................14–9
14.5.4 Modulator
Frequency Reference.........................................................................................14–9
14.5.5 Modulator Spurious Emissions..........................................................................................14–10
14.5.6 Modulator Phase Noise .....................................................................................................14–10
14.5.7 Modulator IF Output Spectrum Shape...............................................................................14–10
14.5.8 L-Band INMARSAT Spurious Emissions...........................................................................14–10
14.5.9 Differential Encoder ...........................................................................................................14–11
14.5.10 BPSK
Bit Ordering.........................................................................................................14–11
14.5.11 Interleaver (Reed-Solomon Codec)...............................................................................14–11
14.5.12 Modulator Transmit Frequency (IF)...............................................................................14–11
14.5.13 Transmit Frequency Change Time................................................................................14–11
14.5.14 Modulator Transmit IF Output Switch............................................................................14–11
14.5.15 Modulator Transmit IF Power ........................................................................................14–11
14.5.16 Modulator Power Offset.................................................................................................14–12
14.5.17 Modulator
I / Q Imbalance .............................................................................................14–12
14.5.18 Modulator Output Noise Floor .......................................................................................14–12
14.5.19 Modulator Spectrum Rotation........................................................................................14–12
14.5.20 Modulator Output Return Loss ......................................................................................14–12
14.5.21 L-Band ODU Reference Signal .....................................................................................14–12
14.5.22 L-Band ODU Control and Monitor .................................................................................14–12
14.5.23 Modulator Transmit IF Test Modes................................................................................14–12
14.5.24 L-Band ODU Supply Voltage.........................................................................................14–13
14.5.25 ODU DC Current Sense ................................................................................................14–13
14.6 Encoding .................................................................................................................. 14–13
14.6.1 BPSK Encoding .................................................................................................................14–13
14.6.2 OQPSK Encoding..............................................................................................................14–14
14.6.3 8PSK Encoding .................................................................................................................14–14
14.7 L-Band Demodulator Specifications...................................................................... 14–15
14.7.1 Digital Data Rate ...............................................................................................................14–15
14.7.2 Demodulation and FEC Decoding Types ..........................................................................14–17
14.7.3 Descrambling Types..........................................................................................................14–18
14.7.4 Differential Decoder...........................................................................................................14–18
14.7.5 BPSK
Bit Ordering.............................................................................................................14–18
14.7.6 Deinterleaver (Reed-Solomon Codec) ..............................................................................14–18
14.7.7 Demodulator Spectrum Rotation .......................................................................................14–19
14.7.8 Receive Frequency............................................................................................................14–19
14.7.9 Input Overload ...................................................................................................................14–19
14.7.10 Demodulator Input Return Loss.....................................................................................14–19
14.7.11 LNB Prime Power ..........................................................................................................14–19
14.7.12 LNB Band Control..........................................................................................................14–19
14.7.13 LNB Reference Signal ...................................................................................................14–19
14.7.14 Receive Input Power (Composite).................................................................................14–20
14.7.15 Demodulator Input Shape..............................................................................................14–20
14.7.16
Receive Input Power (Desired Carrier) .........................................................................14–21
14.7.17 Demodulator Channel Spacing/Adjacent Carrier Performance.....................................14–21