Comtech EF Data CDM-625 - Manual (Page 124)

CDM-625 Advanced Satellite Modem Revision 15
Front Panel Operation MN-CDM625
5–24
5.2.1.4.4 CONFIG: Rx  Demod (Demodulation)
Demod=QPSK (B,Q,OQ,8PSK,16QAM)
FEC Rate=1/2 (1/2,3/4,7/8) ()
Use the ◄ ► arrow keys to select Demod (top line) or FEC Rate (bottom line), and then press
ENTER. Then, for either, use the ▲▼ arrow keys to select the setting. The Decoder type dictates
the FEC Rate choices:
Decoder Type Modulation Type FEC Rate Choice
No Encoder
BPSK
QPSK, OQPSK
Fixed at 1/1
Fixed at 1/1
Non-Turbo Encoder
BPSK
TCM 8-PSK (FAST option)
QPSK, OQPSK
16-QAM (Vit+RS only)
Fixed at Rate 1/2
Fixed at Rate 2/3
1/2, 3/4, 7/8
3/4, 7/8
TPC
(with TPC/LDPC Codec installed)
BPSK
QPSK, OQPSK
8-PSK (FAST option)
16-QAM (FAST option)
5/16, 21/44
1/2, 3/4, 7/8, 0.95
3/4, 7/8, 0.95
3/4, 7/8
LDPC
(with TPC/LDPC Codec installed)
BPSK
QPSK, OQPSK
8-PSK, 8-QAM (FAST)
16-QAM (FAST option)
Fixed at 1/2
1/2, ¾, 7/8
2/3, 3/4
Fixed at 3/4
VFEC
(with VersaFEC Codec installed)
BPSK
QPSK
8-QAM (FAST option)
16-QAM (FAST option)
Fixed at 0.488
0.533, 0.631, 0.706, 0.803
0.576, 0.642, 0.711, 0.780
0.644, 0.731, 0.780, 0.829, 0.853
ULL (Ultra-Low Latency)
(with VersaFEC Codec installed)
BPSK
QPSK
Fixed at 0.493
0.493, 0.654, 0.734
If selecting TPC from the FEC menu with TPC/LDPC Codec installed, the options appear as
shown:
Demod=QPSK (B,Q OQ,8PSK,16Q,8QAM)
FEC Rate=1/2 (1/2,3/4,7/8) ()
If selecting VFEC from the FEC menu with VersaFEC Codec installed, the options appear as
shown:
Demod=BPSK (B,Q,8QAM,16QAM) ()
FEC Rate=0.488 (Fixed)