C.6.2 Modulator (Tx) Commands / Queries - Comtech EF Data SLM-5650A Installation And Operation Manual

SLM-5650A Satellite Modem
Appendix C
C.6.2 Modulator (Tx) Commands / Queries
Tx Priority System = (Highest priority) MOM, RFB, ITF (See Sect. C.6.1), TFM, TFT, TMD, TCR, and TDR (Lowest Priority). Priority
commands indicated by
Command
Parameter (Instruction
Type Code and
Qualifier)
Tx Overhead TFM= 1 byte, value of
Type 0 thru 2, 4
Tx FEC Type TFT= 1 byte, value of
0 thru 6
Tx Modulation TMD= 1 byte, value of
Type 0 thru 4
. Any change to a higher priority parameter can override any of the parameters of lower priority.
shading
Arguments for
Command or
Response to
Query
Command or Query.
Tx Overhead Type, where:
0=None (Unframed)
1=IBS
2=IDR
4=AUPC
Depending on Modem mode, not all selections will be valid.
Example: TFM=0 (selects Unframed mode)
Command or Query.
Tx FEC coding type, where:
0=None (Uncoded)
1=Viterbi
2=Turbo
3=Sequential
4=LDPC ULL (Ultra Low Latency)
5=LDPC LL (Low Latency)
6=LDPC HP (High Performance)
Example: TFT=2 (selects Turbo coding)
Command or Query.
Tx Modulation type, where:
0=BPSK
1=QPSK
2=OQPSK
3=8PSK
4=16QAM
Depending on FEC type, not all selections will be valid.
Example: TMD=1 (selects QPSK)
Description of Arguments
C–8
Revision 8
MN-SLM5650A
Query
Response to (Instruction
Response to Query
Command Code and
Qualifier)
TFM= TFM? TFM=x
TFM? (see Description
TFM* of Arguments)
TFM#
TFT= TFT? TFT=x
TFT? (see Description
TFT* of Arguments)
TFT#
TMD= TMD? TMD=x
TMD? (see Description
TMD* of Arguments)
TMD#