Comtech EF Data CDM-600/600L - Manual (Page 201)

CDM-600/600L Open Network Satellite Modem Revision 3
Appendix D MN/CDM600L.IOM
D–9
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 FEC Type TFT= 1 byte, value
of 0 thru 9 Command or Query.
Tx FEC coding type, where:
0=None (uncoded, rate 1/1) with differential encoding ON
1=Viterbi
2=Viterbi + Reed-Solomon
3=Sequential
4=Sequential + Reed-Solomon
5=TCM (Trellis Code Modulation) (Forces TCR=3 [2/3])
6=TCM + Reed-Solomon (Forces TCR=3 [2/3])
7=Turbo (TPC)
8=None (uncoded, rate 1/1) with differential encoding OFF
9=LDPC (Requires TPC/LDPC codec)
Example: TFT=1 (Viterbi coding)
TFT=
TFT?
TFT*
TFT# TFT? TFT=x
(see Description of
Arguments)
Tx
Modulation
Type TMD= 1 byte, value
of 0 thru 5 Command or Query.
Tx Modulation type, where:
0=BPSK
1=QPSK
2=OQPSK
3=8PSK
4=16QAM (Turbo or Viterbi+RS only)
5=8-QAM (LDPC only)
(Requires TPC/LDPC codec and FAST option)
Depending on FEC type, not all of these selections will be valid.
Example: TMD=2 (OQPSK)
TMD=
TMD?
TMD*
TMD# TMD? TMD=x
(see Description of
Arguments)
Tx FEC Code
Rate TCR= 1 byte, value
of 0 thru 7 Command or Query
Tx FEC Code Rate, 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)
Depending on FEC type, not all of these selections will be valid.
Example: TCR=1 (Rate 3/4)
TCR=
TCR?
TCR*
TCR# TCR? TCR=x
(see Description of
Arguments)