Descrambling Types; Differential Decoder; Bpsk Bit Ordering; Deinterleaver (Reed-Solomon Codec) - Comtech EF Data SDM-300L3 Installation And Operation Manual

SDM-300L3 Satellite Modem
Specifications
14.7.3

Descrambling Types

When descrambling is enabled, it is applied to the demodulator data according to the
programmed demodulator type as listed in Table 14-9. 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
EFD CLosed
EFD Closed
FDC Closed
INTELSAT Open
INTELSAT Open
INTELSAT Open
14.7.4

Differential Decoder

The differential decoder takes care of one set of ambiguities due the error correction codes
being transparent.
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14.7.5

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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14.7.6

Deinterleaver (Reed-Solomon Codec)

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Table 14-9. Descrambling Types
FEC or Framing
Sequential
Viterbi
Viterbi/RS Concatenated
Turbo
Turbo
ASYNC
Sequential or Viterbi
Viterbi IDR
Viterbi IDR with RS
IBS, D&I, IESS-310
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
IESS-315
15-1
2 Synchronous
FDC Modified V.35
ITU V.35 INTELSAT Modified
ITU V.35 INTELSAT Modified
15-1
2 Synchronous
14–18
Revision 0
MN/SDM300L3.IOM