Comtech EF Data SDM-300A - Manual (Page 371)

SDM-300A Satellite Modem Revision 6
Specifications MN/SDM300A.IOM
19–15
19.5.3 Descrambling Types
The operator can select one of the following descrambling types:
Demodulator Type FEC or Framing Scrambling
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 Mode
EFD Closed ASYNC 2 15-1 Synchronous
FDC Closed Sequential 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
19.5.4 Differential Decoder
The differential decoder takes care of one set of ambiguities due the error correction codes
being transparent.
• On or Off
19.5.5 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 (Not Supported)