Comtech EF Data CDM-625A - Manual (Page 323)

CDM-625A Advanced Satellite Modem MN-CDM625A
Serial-based Remote Product Management Revision 3
8–11
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, 0 thru 9,
A thru D
Command or Query.
Sets or returns Tx FEC Coding Type in the form x, 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
C=VersaFEC-2 Long Block
D=VersaFEC-2 Short Block
Example: <0/TFT=1 (selects Viterbi coding)
TFT=
TFT?
TFT*
TFT#
TFT? TFT=x
(see Description of
Arguments)
Tx Modulation
Type
TMD= 1 byte, 0 thru 8 Command or Query (Query only in ACM).
Sets or returns 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=8-ARY (VersaFEC-2 only)
7=16-ARY (VersaFEC-2 only)
8=32-ARY (VersaFEC-2 only)
Depending on FEC type, not all of these selections will be valid.
Example: <0/TMD=2 (selects OQPSK)
TMD=
TMD?
TMD*
TMD#
TMD? TMD=x
(see Description of
Arguments)
Tx FEC Code
Rate
TCR= 1 byte, 0 thru 7,
A thru Z, a thru
z, “, &, @, [, ], {, }
Command or Query (Query only in ACM).
Sets or returns Tx FEC Code Rate in the form x, where:
0=Rate 1/2
1=Rate 3/4
2=Rate 7/8
3=Rate 2/3 (8-PSK TCM or LDPC only)
4=Rate 1/1 (Uncoded or No FEC)
5=Rate 21/44 (Turbo Only)
6=Rate 5/16 (Turbo Only)
7=Rate 0.95 (Turbo Only) (aka 17/18)
8=Reserved
9=Reserved
A=VersaFEC CCM ModCod 0 – BPSK 0.488
B=VersaFEC CCM ModCod 1 – QPSK 0.533
C=VersaFEC CCM ModCod 2 – QPSK 0.631
D=VersaFEC CCM ModCod 3 – QPSK 0.706
TCR=
TCR?
TCR*
TCR#
TCR? TCR=x
(see Description of
Arguments)