Comtech EF Data SNM-1001L - Manual (Page 253)

SNM-1001L Satellite Modem Revision 1
Specifications MN/SNM1001L.IOM
A–15
A.7.3 Descrambling Types
When descrambling is enabled, it is applied to the demodulator data according to the
programmed demodulator type as listed in Table 13-10. When descrambling is disabled,
no descrambling is applied to the demodulator data.
Table A-9. Descrambling Types
Demodulator Type FEC or Framing Descrambling
EFD Closed, CSC Closed Sequential ITU V.35
EFD Closed,
CSC Closed,
FDC Closed Viterbi ITU V.35 INTELSAT Modified
EFD Closed Viterbi/RS Concatenated EFD Modified V.35
EFD Closed Turbo 2 12-1 Synchronous
FDC Closed Sequential or Viterbi FDC Modified V.35
A.7.4 Differential Decoder
The differential decoder takes care of one set of ambiguities due the error correction codes
being transparent.
• On or Off
A.7.5 BPSK Bit Ordering
The decoder has the ability to select whether I is the first bit or Q is the first bit in the
symbol word grouping for compatibility with any system. For standard mode Q is the first
bit.
• Viterbi (Standard/Non-Standard)
• Sequential (Standard/Non-Standard)
• Turbo – fixed order only
A.7.6 Deinterleaver (Reed-Solomon Codec)
• OQPSK, QPSK – Depth 4 (IBS, IDR, D&I)
• 8-PSK – Depth 4 (No overhead, IBS, D&I) (IESS-310)
• Depth 8 (Closed Network, Async)
• 8-PSK – Depth 8 (IDR) (IESS-310)
A.7.7 Demodulator Spectrum Rotation
The operator can select Normal, Inverted, or Auto-Detect of the spectrum for the
Demodulator Input.