Comtech EF Data CDM-710, Installation And Operation Manual

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CDM-710 Broadcast Satellite Modem Revision 11
Appendix A MN/CDM710.IOM
A–33
A.6.3 Modem
Priority System = (Highest priority) TMM, TMD, TCR, and TSR (Lowest Priority) , as indicated by shading . Any change to a higher priority
parameter can override any of the parameters of lower priority.
Parameter
Type
Command
(Instruction
Code and
Qualifier)
Arguments for
Command or
Response to
Query
Description of Arguments
Response to
Command
Query
(Instruction
Code and
Qualifier)
Response to Query
Tx Mode
TMM= 1 byte Command or Query.
Tx Mode, where:
0=DVB-S
1=DVB-S2
2=DVB-DSNG
Example: TMM=0 (DVB-S mode selected)
Note: Refer to Sect. 1.5 Summary of Specifications for available code rates,
modulation types, and symbol rates for each mode.
TMM=
TMM?
TMM*
TMM# TMM? TMM=x
Tx Modulation
Type
TMD= 1 byte Command or Query.
Tx Modulation type, where:
0=QPSK
1=8PSK
2=16QAM
3=16APSK
4=32APSK
Example: TMD=1 (8PSK selected)
Note: Refer to Sect. 1.5 Summary of Specifications for available modulation
types for each mode.
TMD=
TMD?
TMD*
TMD# TMD? TMD=x
Tx FEC Code
Rate
TCR= 1 byte Command or Query.
Tx Code Rate, where:
0 = Rate 3/4
1 = Rate 7/8
2 = Rate 3/5
3 = Rate 4/5
4 = Rate 5/6
5 = Rate 8/9
6 = Rate 9/10
7 = Rate 2/3
8 = Rate 1/2
Depending on FEC type, not all of these selections will be valid.
Example: TCR=0 (Rate 3/4 selected)
Note: Refer to Sect. 1.5 Summary of Specifications for a list of available code
rates for each mode.
TCR=
TCR?
TCR*
TCR# TCR? TCR=x
Tx Symbol Rate
TSR= 9 bytes Command or Query.
Tx Symbol Rate, in the form ss.ssssss where:
ss.ssssss =Symbol Rate in Msps
Example: TSR=20.000000 (20 Msps selected)
TSR=
TSR?
TSR*
TSR# TSR? TSR=ss.ssssss