Comtech EF Data CDM-570A - Manual (Page 119)

CDM-570A/570AL Satellite Modem with Optional Packet Processor MN-CDM570A
Front Panel Operation Revision 2
6–15
6.3.2.3.1 (CONFIG: Tx) FEC (FEC Encoder Type)
Tx FEC: Viterbi Vit-RS
TCM-RS TPC VFEC ULL Unc
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) Tx FEC types and their available
Tx Modulation Types, Codes, and Data Rates are UNAVAILABLE when operating in
CDM-570 Compatible Mode. If the Tx FEC Type is VFEC or ULL when CDM-570
Compatible Mode is selected, then the Tx FEC Type will be reset to Viterbi and the
Modulation and Code Rate will also be reset to appropriate values. See Sect. 6.2
for further information.
Tx FEC Encoder Selection Available Tx Modulation Type Available Tx 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
Use the ◄ ► arrow keys to select the FEC Encoder type. Press ENTER. Referring to the preceding
table, the “Tx FEC Encoder Selection” dictates the “Available Tx Modulation Type” and
“Available Tx Code Rate” choices.