Descrambling Types; Differential Decoder; Bpsk Bit Ordering; Deinterleaver (Reed-Solomon Codec - Comtech EF Data SNM-1001L Installation And Operation Manual

SNM-1001L Satellite Modem
Specifications
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.
Demodulator Type
EFD Closed, CSC Closed
EFD Closed,
CSC Closed,
FDC Closed
EFD Closed
EFD Closed
FDC Closed
A.7.4

Differential Decoder

The differential decoder takes care of one set of ambiguities due the error correction codes
being transparent.
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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.
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•
•
A.7.6

Deinterleaver (Reed-Solomon Codec)

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•
•
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A.7.7

Demodulator Spectrum Rotation

The operator can select Normal, Inverted, or Auto-Detect of the spectrum for the
Demodulator Input.

Table A-9. Descrambling Types

FEC or Framing
Sequential
Viterbi
Viterbi/RS Concatenated
Turbo
Sequential or Viterbi
On or Off
Viterbi (Standard/Non-Standard)
Sequential (Standard/Non-Standard)
Turbo – fixed order only
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)
Descrambling
ITU V.35
ITU V.35 INTELSAT Modified
EFD Modified V.35
12-1
2 Synchronous
FDC Modified V.35
A–15
Revision 1
MN/SNM1001L.IOM