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

Страница: 324 / 408

SDM-300L3 Satellite Modem Revision 0
Specifications MN/SDM300L3.IOM
14–18
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.
Table 14-9. 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
EFD CLosed Turbo IESS-315
EFD Closed ASYNC 2
15-1
Synchronous
FDC Closed Sequential or Viterbi FDC Modified V.35
INTELSAT Open Viterbi IDR ITU V.35 INTELSAT Modified
INTELSAT Open Viterbi IDR with RS ITU V.35 INTELSAT Modified
INTELSAT Open IBS, D&I, IESS-310 2
15-1
Synchronous
14.7.4 Differential Decoder
The differential decoder takes care of one set of ambiguities due the error correction codes
being transparent.
•
On or Off
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.
•
Viterbi (Standard/Non-Standard)
•
Sequential (Standard/Non-Standard)
•
Turbo – fixed order only
14.7.6 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)