Comtech EF Data CDM-570A - Manual (Page 129)

CDM-570A/570AL Satellite Modem with Optional Packet Processor MN-CDM570A
Front Panel Operation Revision 2
6–25
6.3.2.4.1 (CONFIG: Rx) FEC (FEC Decoder Type)
Rx FEC: Viterbi Vit-RS
TCM-RS TPC VFEC ULL Unc
Use the ◄ ► arrow keys to select the FEC Decoder type. Press ENTER.
1) IMPORTANT NOTE – All selections are always viewable. If a Hardware or FAST
option is either uninstalled or invalid, the cursor will skip past the unavailable
choice.
2) The VFEC (VersaFEC) and ULL (Ultra Low Latency) Rx FEC types and their
available Rx Demodulation Types, Codes, and Data Rates are UNAVAILABLE
when operating in CDM-570 Compatible Mode. If the Rx FEC Type is VFEC or ULL
when CDM-570 Compatible Mode is selected, then the Rx FEC Type will be reset
to Viterbi and the Demodulation and Code Rate will also be reset to appropriate
values. See Sect. 6.2 for further information.
Rx FEC Decoder Selection Available Rx Demodulation Type Available Rx Code Rate
Viterbi
BPSK Fixed at 1/2
QPSK
1/2, 3/4, 7/8
OQPSK
Vit-RS
(Viterbi + Concatenated Reed-
Solomon)
BPSK Fixed at 1/2
QPSK
1/2, 3/4, 7/8
OQPSK
16-QAM (FAST) 3/4, 7/8
TCM-RS (Trellis Coded Modulation
+ Concatenated Reed-Solomon)
8-PSK (FAST) Fixed at 2/3
TPC (Turbo Product Codec)
BPSK 5/16, 21/44
QPSK
21/44, 3/4, 7/8, 0.95
OQPSK
8-PSK (FAST)
3/4, 7/8, 0.95
8-QAM (FAST)
16-QAM (FAST) 3/4, 7/8
VFEC (VersaFEC) Note 2
BPSK Fixed at .488
QPSK .533, .631, .706, .803
8-QAM (FAST) .576, .642, .711, .780
16-QAM (FAST) .644, .731, .780, .829, .853
ULL (Ultra Low Latency) Note 2
BPSK Fixed at .493
QPSK .493, .654, .734
Unc (Uncoded)
BPSK
Fixed at 1:1 QPSK
OQPSK
Referring to the preceding table, the “Rx FEC Decoder Selection” dictates the “Available Rx
Demodulation Type” and “Available Rx Code Rate” choices.