Modem Performance Information - Comtech EF Data CDM-750 Installation And Operation Manual

CDM-750 Advanced High-Speed Trunking Modem
Appendix D
D.6.9

Modem Performance Information

Command
Parameter
(Instruction
Type
& Qualifier)
BERT 10E-3 BKE= 1 byte
Error Insert
BERT Results N/A 22 bytes
All
BERT Clear BER BRM= N/A
Counters
Tx BERT State BTX= 1 byte
CnC N/A 6 bytes
Delay Monitor
CnC N/A 6 bytes
Freq Offset
Monitor
CnC N/A 4 bytes
Ratio Monitor
Number of
Arguments
Command only.
Inserts a single error
Example: BKE= (Insert an error)
Query only.
Returns 3 values in the form x.xEx:y.yEy:z.zEz where:
x.xEx = The total number of bit errors
y.yEy = The total number of bits
z.zEz = The value of the average BER.
Each parameter is separated by a colon.
Example 1: BRA=1.0E+03:2.2E+06:1.0E+03
Command only.
Clears the BER counters.
Command or Query.
Tx BERT state in the form x, where:
0=off
1=on
Example: BTX=1 (BERT On)
Query only.
When CnC is enabled and the modem is locked, it monitors the delay of the
interferer in microseconds in the form xxxxxx, where:
Example 1: CDM=229500 (229.5 ms)
Example 2: CDM=999999 (not locked or CnC not enabled)
Query only.
When CnC is enabled, an estimated frequency offset (in kHz) between desired
and interferer will be calculated, in the form xxxx.x where:
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 the modem is locked, it monitors the ratio between
the interferer and the desired power, in dB:
Example 1: CRM==+02 (interferer > desired) (format: =sdd)
Example 2: CRM=LT11 (less than –11 dB)
Example 3: CRM=GT11 (greater than +11 dB)
Example 4: CRM=99.9 (not locked or CnC not enabled)
Description of Arguments
D–31
Query
Response to
(Instruction & Response to Query
Command
Qualifier)
BKE = N/A BKE=
BKE? (see Description of
BKE * Arguments)
BKE #
BRA = BRA? BRA=x.xEx:y.yEy:z.zEz
BRA? (see Description of
BRA * Arguments)
BRA #
BRM = N/A N/A
BRM?
BRM *
BRM #
BTX = BTX? BTX=x
BTX? (see Description of
BTX * Arguments)
BTX #
N/A CDM? CDM=xxxxxx
(see Description of
Arguments)
N/A CFM? CFM=xxxx.x
(see Description of
Arguments)
N/A CRM? CRM=xxxx
(see Description of
Arguments)
Revision 1
MN-CDM750