Comtech EF Data CDM-425, Installation And Operation Manual

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CDM-425 Advanced Satellite Modem
Revision 0
Serial Remote Control 8–52 MN-CDM-425
8.5.7 Modem Performance Information
Parameter
Command
(Instruction
& Qualifier)
Number of
Arguments
Description of Arguments
Response to
Command
Query
(Instruction
& Qualifier)
Response to Query
Rx Signal
Level
N/A 5 bytes Query Only.
Returns the value of the Rx signal level in the form xxxxx, where:
xxxxx=Value, in dBm, from -20 thru -90.
NOTE:
If >-20 dBm, returns RSL=GT-20 (GT=‘greater than’)
If <-90 dBm, returns RSL=LT-90 (LT=‘less than’)
If in the range of -20 thru -90dBm, returns RSL=-xx.y (resolution=0.5dB)
EXAMPLE: <0/RSL? >0/RSL=-45.5 (indicates -45.5 dBm)
N/A RSL? RSL=xxxxx
(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, in the form sxxx.x,
where:
s=sign (+ or –)
xxx.x=Value, in kHz, from ± 0 thru ± 200.
Resolution=100 Hz
NOTES:
1) Returns 999999 if the demodulator is unlocked.
2) The maximum Rx Frequency Offset corresponds to the Receive Sweep Width (RSW)
EXAMPLE: <0/RFO? >0/RFO=+002.3 (ind2.3 kHz)
N/A RFO? RFO=sxxx.x
(See Description of
Arguments)
Buffer Fill
State
N/A 2 bytes,
numeric
Query only.
Returns the value of the buffer fill state in the for xx, where:
xx=Percentage value from 01 to 99
NOTE: Returns 00 if demodulator is unlocked.
EXAMPLE: <0/BFS? >0/BFS=33 (indicates 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 x.xEc, where:
x.x=Value
Ec=Exponent
NOTE: Returns 99999 if the demodulator is unlocked or BER data is unavailable.
EXAMPLE: <0/BER? >0/BER=4.8E3 (indicates BER @ 4.8 x 10
-3
)
N/A BER? BER=x.xEc
(See Description of
Arguments)
Rx Eb/No N/A 4 bytes Query only.
Returns the value of Eb/No in the form xx.x, where:
xx.x=Value, in dB, from 00 or 16
Resolution=0.1 dB
NOTE: Returns 99.9 if demod is unlocked; r016 for values greater than 16.0 dB.
EXAMPLE: <0/EBN? >0/EBN=12.3 (indicates Eb/No @12.3 dB)
N/A EBN? EBN=xxxx
(see Description of
Arguments)
Redundancy
State
N/A 1 byte,
0 or 1
Query only.
Returns the redundancy state of the unit in the form x, where:
0=Offline
1=Online
EXAMPLE: <0/RED? >0/RED=1 (indicates redundancy state as Online)
N/A RED? RED=x
(See Description of
Arguments)