Comtech EF Data CDM-625 - Page 481

CDM-625 Advanced Satellite Modem Revision 13
Appendix D MN-CDM625
D–11
Parameter
Type
Command
(Instruction
& Qualifier)
Number of
Arguments
Description of Arguments
Response to
Command
Query
(Instruction &
Qualifier)
Response to
Query
Tx FEC Type
TFT=
1 byte, value
of 0 thru 9, A,
B
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)
TFT=
TFT?
TFT*
TFT#
TFT?
TFT=x
(see Description of
Arguments)
Tx
Modulation
Type
TMD=
1 byte, value
of 0 thru 5
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)
TMD=
TMD?
TMD*
TMD#
TMD?
TMD=x
(see Description of
Arguments)