Comtech EF Data CDM-570 - Manual (Page 365)

CDM-570/570L Satellite Modem with Optional IP Module Revision 12
Appendix D MN/CDM570L.IOM
D–15
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
Rx FEC Code
Rate RCR= 1 byte,
value of 0 thru 7 Command or Query.
Rx FEC Code Rate, where:
0 = Rate 5/16 (Turbo Only)
1 = Rate 21/44 (Turbo Only)
2 = Rate 1/2
3 = Rate 2/3 (8-PSK TCM or 8-QAM only)
4 = Rate 3/4
5 = Rate 7/8
6 = Rate 0.95 (Turbo Only)
7 = Rate 1/1 (Uncoded or No FEC)
Depending on FEC and demodulation type, not all of these selections will be
valid.
Example: RCR=1 (selects Rate 3/4) RCR=
RCR?
RCR*
RCR#
RCR+ RCR? RCR=x
(see Description
of Arguments)
Rx Data Rate RDR= 8 bytes Command or Query.
Rx Data Rate, in kbps, between 2.4 kbps to 9.98 Mbps.
Resolution=1 bps
Example: RDR=2047.999 RDR=
RDR?
RDR*
RDR# RDR? RDR=xxxx.xxx
(see Description
of Arguments)
Rx BER N/A 5 bytes Query only.
Value of the estimated corrected BER is returned in the form a.b x 10
-c where:
a.b = value, -c L= exponent.
Returns 99999 if the demodulator is unlocked.
Example: BER=4.8E3 (which is BER = 4.8 x 10
-3 )
N/A BER? BER=a.bEc
(see description
of arguments)
Rx E
b
/N
0
N/A 4 bytes Query only.
The value of E
b
/N
0
, between 0 and 16 dB, is returned.
Resolution 0.1 dB.
Returns 99.9 if demod is unlocked.
For values greater than 16.0 dB, the reply will be: EBN=+016
Example: EBN=12.3 (E
b
/N
0
= 12.3 dB)
N/A EBN? EBN=xxxx
(see Description of
Arguments)