D.5.7 Modem Performance Information - Comtech EF Data CDM-625 Installation And Operation Manual

CDM-625 Advanced Satellite Modem
Appendix D
D.5.7 Modem Performance Information
Command
Parameter Number of
(Instruction
Type Arguments
& Qualifier)
Rx Signal N/A 5 bytes
Level
Rx Frequency N/A 6 bytes
Offset
Exception –
600L
Emulation:
5 bytes
Buffer Fill N/A 2 bytes
State
Rx BER N/A 5 bytes
Rx Eb/No N/A 4 bytes
Redundancy N/A 1 byte, 0 or 1
State
Temperature N/A 3 bytes
Description of Arguments
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)
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)
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%)
Query only.
Units returns the value of the estimated corrected BER in the form a.bx10
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
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)
Query only.
Unit returns the redundancy state of the unit in the form x, where:
0=Offline
1=Online
Example: RED=1 (selects Online)
Query only.
Unit returns the value of the internal temperature sensor (degrees C) in the form xxx, where:
Example: TMP=+26
, where:
-3
)
-3
D–50
Revision 13
MN-CDM625
Query
Response to Response to
(Instruction &
Command
Qualifier)
N/A RSL? RSL=xxxxx
(See Description of
Arguments)
N/A RFO? RFO=sxxx.x
(See Description of
Arguments)
N/A BFS? BFS=xx
(See Description of
Arguments)
N/A BER? BER=xxxxx
(See Description of
Arguments)
N/A EBN? EBN=xxxx
(see Description of
Arguments)
N/A RED? RED=x
(See Description of
Arguments)
N/A TMP? TMP=xxx
(see Description of
Arguments)
Query