Comtech EF Data CDM-625 Installation And Operation Manual page 481

CDM-625 Advanced Satellite Modem
Appendix D
Command
Parameter Number of
(Instruction
Type Arguments
& Qualifier)
Tx FEC Type TFT= 1 byte, value
of 0 thru 9, A,
B
Tx TMD= 1 byte, value
Modulation of 0 thru 5
Type
Description of Arguments
Command or Query.
Tx FEC coding type, where:
0=None (uncoded) with differential encoding ON
1=Viterbi
2=Viterbi + Reed-Solomon
3=Sequential
4=Sequential + Reed-Solomon
5=TCM (Trellis Code Modulation)
(Forces Rate 2/3)
6=TCM + Reed-Solomon (Forces Rate 2/3)
7=TPC (aka Turbo) (requires TPC/LDPC Codec)
8=None (uncoded) with differential encoding OFF
9=LDPC (Requires TPC/LDPC Codec)
A=VersaFEC CCM or ACM (fixed in IP-ACM)
B=VersaFEC ULL
Example: TFT=1 (selects Viterbi coding)
Command or Query (Query only in IP-ACM).
Tx Modulation type in the form x, where:
0=BPSK
1=QPSK
2=OQPSK
3=8-PSK
4=16-QAM (Turbo or Viterbi + RS only)
5=8-QAM (TPC/LDPC only) (Need Codec & FAST option)
6=Reserved
7=Reserved
8=Reserved
Depending on FEC type, not all of these selections will be valid.
Example: TMD=2 (selects OQPSK)
D–11
Revision 13
MN-CDM625
Query
Response to Response to
(Instruction &
Command
Qualifier)
TFT= TFT? TFT=x
TFT?
TFT* (see Description of
TFT# Arguments)
TMD= TMD? TMD=x
TMD?
TMD* (see Description of
TMD# Arguments)
Query