Comtech EF Data CDM-425, Installation And Operation Manual

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CDM-425 Advanced Satellite Modem
Revision 0
Front Panel Operation 6–26 MN-CDM-425
6.2.1.4.3 CONFIG: Rx

FEC
Dec=VFEC (VFEC,ULL,VF2L,VF2S)
(

)
Use the
▲▼ arrow keys to select an available Decoder option (shown in parentheses). Press
ENTER . Valid selections are:
► VFEC (VersaFEC) ► VF2L (VersaFEC-2 Long Block)
► ULL (VersaFEC Ultra-Low Latency) ► VF2S (VersaFEC-2 Short Block)
6.2.1.4.4 CONFIG: Rx

Demod (Demodulation)
Demod=BPSK (B,Q,8QAM,16QAM) (

)
FEC Rate=0.488 (Fixed)
Use the
◄ ►
arrow keys to select Demod (top line) or FEC Rate (bottom line). Press ENTER .
Then, for either, use the
▲▼ arrow keys to select the setting. The Decoder type selected dictates
the FEC Rate selections:
Decoder Type Modulation Type FEC Rate Choice
VFEC
BPSK Fixed at 0.488
QPSK 0.533, 0.631, 0.706, 0.803
8-QAM (FAST option) 0.576, 0.642, 0.711, 0.780
16-QAM (FAST option) 0.644, 0.731, 0.780, 0.829, 0.853
ULL
(VersaFEC Ultra-Low Latency)
BPSK Fixed at 0.493
QPSK 0.493, 0.654, 0.734
VF2L (VersaFEC-2 Long Block) or
VF2S (VersaFEC-2 Short Block)
VF2L or VF2S (cont.)
BPSK Fixed at 0.489
QPSK
0.489, 0.537, 0.586, 0.611, 0.635, 0.660,
0.684, 0.733
8-ARY (FAST option)
0.521, 0.537, 0.562, 0.586, 0.611, 0.635,
0.770, 0.684, 0.708, 0.733
16-ARY (FAST option)
0.586, 0.611, 0.635, 0.660, 0.684, 0.708,
0.733, 0.757, 0.782
32-ARY (FAST option)
0.660, 0.684, 0.708, 0.733, 0.757, 0.782,
0.801, 0.831, 0.855, 0.879