Modem Performance Information - Comtech EF Data CDM-570A Installation And Operation Manual

CDM-570A/570AL Satellite Modem with Optional Packet Processor
Serial-based Remote Product Management
8.3.7

Modem Performance Information

Command
Parameter (Instruction
Type Code and
Qualifier)
Rx Signal Level N/A 4 bytes
Rx Frequency N/A 6 bytes
Offset
Buffer Fill N/A 2 bytes
State
Rx BER N/A 5 bytes
Rx E /N N/A 4 bytes
b 0
Arguments for
Command or
Response to
Query
Query Only.
Returns the value of the Rx signal level, in dBm, from –5 to –99 dBm, in the form
ccxx, where:
cc = code (GT= greater than; LT = less than, == is 'equal to')
xx = value (the '-' sign is implied)
Examples: <0/RSL?
1) >0/RSL=LT99 (Rx signal level is less than -99 dBm)
2) >0/RSL===41 (Rx signal level is equal to -41 dBm)
Query only.
Returns the value of the measured frequency offset of the carrier being
demodulated, range from ±0 to ±32 kHz, in the form sxxx.x, where:
s = sign (+ or –)
xxx.x = value
Resolution = 100 Hz
Unit returns +999.9 if the demodulator is unlocked.
Note: The maximum Rx Frequency Offset corresponds to the Receive Sweep
Width (RSW)
Example: <0/RFO?
>0/RFO=+002.3 (+2.3 kHz)
Query only.
Unit returns the value of the buffer fill state, from 1 to 99%. Returns 00 if
demodulator is unlocked.
Example: <0/BFS?
>0/BFS=33 (33%)
Query only.
Returns the value of the estimated corrected BER in the form a.bE
a.b = value
E -c = exponent.
Returns 99999 if the demodulator is unlocked.
Example: <0/BER?
>0/BER=4.8E3 (BER = 4.8 x 10
Query only.
Returns the value of E /N
b
Returns 99.9 if demod is unlocked.
For values >16.0 dB, Response = EBN=+016
Example: <0/EBN?
>0/EBN=12.3 (E
Description of Arguments
-c
-3 )
, from 0 to 16 dB, in the form xxxx, resolution= 0.1 dB.
0
/N = 12.3 dB)
b 0
8–44
Response to
(Instruction Code
Command
and Qualifier)
N/A RSL?
N/A RFO?
N/A BFS?
N/A BER?
where:
N/A EBN?
MN-CDM570A
Revision 3
Query
Response to
Query
RSL=ccxx
(see description
of arguments)
RFO=sxxx.x
(See Description of
Arguments)
BFS=xx
(See Description of
Arguments)
BER=a.bEc
(see description
of arguments)
EBN=xxxx
(see Description of
Arguments)