Tx Parameters - Comtech EF Data CDM-740 Installation And Operation Manual

CDM-740 Advanced Satellite Modem
Remote Control
A.5.1

Tx Parameters

Priority System: TIT (Highest priority), TFT, TMD, TCR, TDR, and TSR (Lowest Priority), indicated by shading.
Any change to a higher priority parameter can override any of the parameters of lower priority.
Command
Parameter Number of
(Instruction
Type Arguments
& Qualifier)
Tx Interface TIT= 1 byte, value of
Type 0 thru 9, or A
Tx FEC Type TFT= 1 byte, value of
0 thru xx
Tx Modulation TMD= 1 byte, value of
Type 0 thru 3
Description of Arguments
Command or Query.
Tx Interface Type, where:
0 = IP
1 = Reserved
Example: TIT=1 (selects IP)
Command or Query.
Tx FEC coding type, where:
0=TPC (aka Turbo)
Example: TFT=0 (selects Turbo)
Command or Query.
Tx Modulation type, where:
0=reserved
1=QPSK
2=8-QAM
3=16-QAM
Depending on FEC type, not all of these selections will be valid.
The following code rate/mod type combinations are supported:
Rate 1/2 QPSK
Rate 3/4 QPSK/8-QAM/16-QAM
Rate 7/8 QPSK/8-QAM/16-QAM
Rate 0.95 QPSK/8-QAM
Example: TMD=3 (selects 8-QAM)
A–6
Revision 0
MN-CDM740
Query
Response to
(Instruction Response to Query
Command
& Qualifier)
TIT= TIT? TIT=x
TIT?
TIT* (see Description of
Arguments)
TIT#
TFT= TFT? TFT=x
TFT?
TFT* (see Description of
Arguments)
TFT#
TMD= TMD? TMD=x
TMD? (see Description of
Arguments)
TMD*
TMD#