Comtech EF Data CDM-625 - D.5.7 Modem Performance Information

CDM-625 Advanced Satellite Modem Revision 13
Appendix D MN-CDM625
D–50
D.5.7 Modem Performance Information
Parameter
Type
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.
Unit returns the value of the Rx signal level, in dBm, between –20 and –90 dBm.
If >-20dBm, returns RSL=GT-20 (GT = ‘greater than’)
If <-90 dBm, returns RSL=LT-90 (LT = ‘less than’)
If in the range of –20 to –90dBm,
returns RSL=-xx.y (resolution 0.5dB)
Example: RSL=-45.5 (indicating –45.5 dBm)
N/A
RSL?
RSL=xxxxx
(See Description of
Arguments)
Rx Frequency
Offset
N/A
6 bytes
Exception –
600L
Emulation:
5 bytes
Query only.
Unit returns the value of the measured frequency offset of the carrier being demodulated.
Values range from ± 0 to ± 200 kHz, 100 Hz resolution.
Returns 999999 if the demodulator is unlocked.
The maximum Rx Frequency Offset corresponds to the Receive Sweep Width (RSW)
Example: RFO=+002.3 (selects + 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, between 1 and 99%. Returns 00 if demodulator is unlocked.
Example: BFS=33 (selects 33%)
N/A
BFS?
BFS=xx
(See Description of
Arguments)
Rx BER
N/A
5 bytes
Query only.
Units returns the value of the estimated corrected BER in the form a.bx10
-3
, where:
First three bytes are the value.
Last two bytes are the exponent.
Returns 99999 if the demodulator is unlocked or BER data is unavailable.
Example: BER=4.8E3 (selects BER=4.8 x 10
-3
)
N/A
BER?
BER=xxxxx
(See Description of
Arguments)
Rx Eb/No
N/A
4 bytes
Query only.
Unit returns the value of Eb/No, between 0 to 16 dB. Format xx.x, resolution 0.1 dB.
Returns 99.9 if demod is unlocked.
Returns +016 for values greater than 16.0 dB.
Example: EBN=12.3 (selects 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.
Unit returns the redundancy state of the unit in the form x, where:
0=Offline
1=Online
Example: RED=1 (selects Online)
N/A
RED?
RED=x
(See Description of
Arguments)
Temperature
N/A
3 bytes
Query only.
Unit returns the value of the internal temperature sensor (degrees C) in the form xxx, where:
Example: TMP=+26
N/A
TMP?
TMP=xxx
(see Description of
Arguments)