Descrambling types, Differential decoder, Bpsk bit ordering – Comtech EF Data SNM-1010L User Manual
Page 253: B.3.22.2 descrambling types, B.3.22.3 differential decoder, B.3.22.4 bpsk bit ordering
SNM-1010L Data/Control Modem Revision 0
Specifications
MN/SNM1010L.OM
The following combinations of demodulation and forward error correction decoding are
available.
Encoder
Code Rate
Reed-Solomon
Modulation
Viterbi, K7
1/2
BPSK
Viterbi, K7
1/2
225/205 Closed
BPSK
Viterbi, K7
1/2, 3/4, 7/8
QPSK/OQPSK
Viterbi, K7,
TCM
2/3
8PSK
Viterbi, K7
1/2, 3/4, 7/8 225/205
Closed QPSK/OQPSK
Sequential 1/2
BPSK
Sequential
1/2
225/205 Closed
BPSK
Sequential 1/2,
3/4, 7/8
QPSK/OQPSK
Sequential
1/2, 3/4, 7/8
225/205 Closed
QPSK/OQPSK
Turbo Product
21/44, 5/16
BPSK
Turbo Product
3/4
QPSK/OQPSK
Turbo Product
3/4
8PSK
Uncoded
1/1
BPSK, QPSK, QPSK
Note: Reed Solomon is a fixed 225/205, t = 10 rate, with a fixed 8 depth interlever.
B.3.22.2 Descrambling
Types
The operator selects one of the following descrambling types.
• CCITT V.35 (
Comtech EF Data
or Comstream compatible). Sequential only
• CCITT V.35 Intelsat modified. Viterbi only
• Fairchild compatible. Sequential only
• 2^15 -1 Synchronous (for use in ASYNC overhead mode)
• Modified V.35 (Closed Network Reed-Solomon)
• None
B.3.22.3 Differential
Decoder
The differential decoder takes care of one set of ambiguities due the error correction
codes being transparent.
• On or off
B.3.22.4
BPSK Bit Ordering
B–11