Comtech EF Data CDM-625 - CONFIG: Tx  Mod (Modulation)

CDM-625 Advanced Satellite Modem Revision 13
Front Panel Operation MN-CDM625
5–17
5.2.1.3.5 CONFIG: Tx  Mod (Modulation)
Mod=QPSK (B,Q,OQ,8PSK,16Q,8QAM)
FEC Rate=1/2 (1/2,3/4,7/8) ()
Use the
◄ ►arrow keys to select the Modulation type (top line) or the FEC rate (bottom line),
and then use the
▲▼ arrow keys to change that parameter selection. The Encoder type dictates
the Modulation Type and FEC rate choices:
Encoder 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 (aka 21/44), 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, 2/3, 3/4
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
(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:
Mod=QPSK (B,Q OQ,8PSK,16Q,8QAM)
FEC Rate=1/2 (1/2,3/4,7/8,0.95) ()
If selecting VFEC from the FEC menu with VersaFEC Codec installed, the options appear as
shown:
Mod=BPSK (B,Q,8QAM,16QAM) ()
FEC Rate=0.488 (Fixed)
If selecting ULL from the FEC menu with VersaFEC Codec installed, the options appear as shown: