Comtech EF Data SDM-300A - Manual (Page 364)

SDM-300A Satellite Modem Revision 6
Specifications MN/SDM300A.IOM
19–8
19.4.3 Scrambling Types
The operator can select one of the following scrambling types.
Modulation 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
19.4.4 Differential Encoder
The differential encoder (On or Off) takes care of one set of ambiguities due the error
correction codes being transparent.
19.4.5 BPSK Bit Ordering
The encoder 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 operation Q is the first bit.
• Viterbi (Standard/Non-Standard)
• Sequential (Standard/Non-Standard)
• Turbo (Not Supported)
19.4.6 Interleaver (Reed-Solomon Codec)
• QPSK – Depth 4 (IBS, IDR, D&I)
• 8-PSK – Depth 4 (No Overhead, IBS, D&I) (IESS-310)
• QPSK/OPSK – Depth 4, 8, 16 (Closed Network, ASYNC)
• 8-PSK – Depth 8 (IDR) (IESS-310)