Modem - Comtech EF Data CDM-710 Installation And Operation Manual

CDM-710 Broadcast Satellite Modem
Appendix A
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.
Command Arguments for
Parameter (Instruction Command or
Type Code and Response to
Qualifier) Query
Tx Mode
TMM= 1 byte
Tx Modulation
TMD= 1 byte
Type
Tx FEC Code
TCR= 1 byte
Rate
Tx Symbol Rate TSR=
9 bytes
Description of Arguments
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.
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.
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.
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)
A–33
MN/CDM710.IOM
Query
Response to (Instruction
Response to Query
Command Code and
Qualifier)
TMM= TMM? TMM=x
TMM?
TMM*
TMM#
TMD= TMD? TMD=x
TMD?
TMD*
TMD#
TCR= TCR? TCR=x
TCR?
TCR*
TCR#
TSR= TSR? TSR=ss.ssssss
TSR?
TSR*
TSR#
Revision 11