Comtech EF Data CDM-570A - Manual (Page 284)

CDM-570A/570AL Satellite Modem with Optional Packet Processor MN-CDM570A
Serial-based Remote Product Management Revision 2
8–44
8.3.7 Modem Performance Information
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 Signal Level N/A 4 bytes 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)
N/A RSL? RSL=ccxx
(see description
of arguments)
Rx Frequency
Offset
N/A 6 bytes 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)
N/A RFO? RFO=sxxx.x
(See Description of
Arguments)
Buffer Fill
State
N/A 2 bytes 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%)
N/A BFS? BFS=xx
(See Description of
Arguments)
Rx BER N/A 5 bytes Query only.
Returns the value of the estimated corrected BER in the form a.bE -c where:
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 -3 )
N/A BER? BER=a.bEc
(see description
of arguments)
Rx E
b
/N
0
N/A 4 bytes Query only.
Returns the value of E
b
/N
0
, from 0 to 16 dB, in the form xxxx, resolution= 0.1 dB.
Returns 99.9 if demod is unlocked.
For values >16.0 dB, Response = EBN=+016
Example: <0/EBN?
>0/EBN=12.3 (E
b
/N
0
= 12.3 dB)
N/A EBN? EBN=xxxx
(see Description of
Arguments)