Specifications

SDM-300L3 Satellite Modem Revision 0
Preface MN/SDM300L3.IOM
viii
15.5.1 Digital Data Rate.................................................................................................................15–6
15.5.2 Modulation and Encoding Types........................................................................................15–8
15.5.3 Scrambling Types ...............................................................................................................15–9
15.5.4 Modulator Frequency Reference.........................................................................................15–9
15.5.5 Modulator Spurious Emissions.........................................................................................15–10
15.5.6 Modulator Phase Noise.....................................................................................................15–10
15.5.7 Modulator IF Output Spectrum Shape..............................................................................15–10
15.5.8 L-Band INMARSAT Spurious Emissions........................................................................15–10
15.5.9 Differential Encoder..........................................................................................................15–11
15.5.10 BPSK Bit Ordering .......................................................................................................15–11
15.5.11 Interleaver (Reed-Solomon Codec)...............................................................................15–11
15.5.12 Modulator Transmit Frequency (IF) .............................................................................15–11
15.5.13 Transmit Frequency Change Time................................................................................15–11
15.5.14 Modulator Transmit IF Output Switch..........................................................................15–11
15.5.15 Modulator Transmit IF Power.......................................................................................15–11
15.5.16 Modulator Power Offset................................................................................................15–12
15.5.17 Modulator I / Q Imbalance............................................................................................15–12
15.5.18 Modulator Output Noise Floor......................................................................................15–12
15.5.19 Modulator Spectrum Rotation.......................................................................................15–12
15.5.20 Modulator Output Return Loss .....................................................................................15–12
15.5.21 L-Band ODU Reference Signal ....................................................................................15–12
15.5.22 L-Band ODU Control and Monitor...............................................................................15–12
15.5.23 Modulator Transmit IF Test Modes ..............................................................................15–12
15.5.24 L-Band ODU Supply Voltage.......................................................................................15–13
15.5.25 ODU DC Current Sense................................................................................................15–13
15.6 Encoding ..................................................................................................................................15–13
15.6.1 BPSK Encoding ................................................................................................................15–13
15.6.2 OQPSK Encoding .............................................................................................................15–14
15.6.3 8PSK Encoding.................................................................................................................15–14
15.7 L-Band Demodulator Specifications .....................................................................................15–15
15.7.1 Digital Data Rate...............................................................................................................15–15
15.7.2 Demodulation and FEC Decoding Types .........................................................................15–17
15.7.3 Descrambling Types .........................................................................................................15–18
15.7.4 Differential Decoder .........................................................................................................15–18
15.7.5 BPSK Bit Ordering ...........................................................................................................15–18
15.7.6 Deinterleaver (Reed-Solomon Codec)..............................................................................15–18
15.7.7 Demodulator Spectrum Rotation ......................................................................................15–19
15.7.8 Receive Frequency............................................................................................................15–19
15.7.9 Input Overload ..................................................................................................................15–19
15.7.10 Demodulator Input Return Loss....................................................................................15–19
15.7.11 LNB Prime Power.........................................................................................................15–19
15.7.12 LNB Band Control........................................................................................................15–19
15.7.13 LNB Reference Signal ..................................................................................................15–19
15.7.14 Receive Input Power (Composite) ................................................................................15–20
15.7.15 Demodulator Input Shape .............................................................................................15–20
15.7.16 Receive Input Power (Desired Carrier).........................................................................15–21
15.7.17 Demodulator Channel Spacing/Adjacent Carrier Performance ....................................15–21