Queries - Comtech EF Data CDM-Qx Installation And Operation Manual

CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier®
Appendix C
C.6.4

Queries

Command Arguments for
Parameter (Instruction Command or
Type Code and Response to
Qualifier)
RX BER N/A 5 bytes
Buffer Fill N/A 2 bytes
State
CnC Delay N/A 7 bytes
Monitor
CnC Freq N/A 6 bytes
Offset Monitor
CnC Ratio N/A 4 bytes
Monitor
Description of Arguments
Query
Query only.
Unit returns the value of the estimated corrected BER in the form
-c
a.b x 10 , where:
First 3 bytes are the value.
Last 2 bytes are the exponent.
Returns 99999 if the demodulator is unlocked.
Example: BER=4.8E3 (BER = 4.8 x 10
Query only.
Unit returns the value of the buffer fill state in the form xx, where:
xx = value between 1 to 99%
Returns 00 if demodulator is unlocked
Example: BFS=33 (33%)
Query only.
When CnC is enabled and it's locked, it monitors the delay of the
interferer in microseconds.
Example 1: CDM=229,500 (229.5 ms)
Example 2: CDM=999,999 (not locked or CnC not enabled)
Query only.
When CnC is enabled, an estimated frequency offset between
desired and interferer will be calculated.
Unit is in kilohertz ( kHz).
Example 1: CFM=+001.0 (1 kHz)
Example 2: CFM=9999.9 (not locked or CnC not enabled)
Query only.
When CnC is enabled and it's locked, it monitors the ratio between
the interferer and the desired power in dB.
Example 1: CRM==+02 (interferer > desired)
Example 2: CRM=LT10 (less than –11 dB)
Example 3: CRM=GT10(greater than +11 dB)
Example 4: CRM=99.9 (not locked or CnC not enabled)
Response to
Command
N/A
-3
)
N/A
N/A
N/A
N/A
C–24
Revision 7
MN/CDMQX.IOM
Query
(Instruction
Response to Query
Code and
Qualifier)
BER? BER=a.bEc
(see Description of
Arguments)
BFS? BFS=xx
(see Description of
Arguments)
CDM? CDM=xxx.xxx
(see Description of
Arguments)
CFM? CFM=xxxx.x
(see Description of
Arguments)
CRM? CRM=xxxx
(see Description of
Arguments)