Comtech EF Data CDM-760, Installation And Operation Manual

Page: 286 / 441

Serial Interface Operation Revision 3
CDM-760 Advanced High-Speed Trunking Modem MN-CDM760
8–43
Parameter Type
Controller-to-Target
Instruction Code and
Qualifier
Arguments for
Command or
Query
Description of Arguments
(Note that all arguments are ASCII numeric codes from 48 to 57)
Target-to-Controller
(see Description of Arguments)
Command Query
Response to
Command
Response to
Query
CnC
Ratio Monitor
N/A CRM? 4 bytes Query only.
When CnC is enabled and the modem is locked, it monitors the ratio between the interferer and the desired power.
Ratio is returned, in dB, in the form xxxx.
EXAMPLE: <0/CRM?
RESPONSE EXAMPLE 1: >0000/CRM=+02 (interferer > desired) (format:=sdd)
RESPONSE EXAMPLE 2: >0000/CRM=LT11 (less than –11 dB)
RESPONSE EXAMPLE 3: >0000/CRM=GT11 (greater than +11 dB)
RESPONSE EXAMPLE 4: >0000/CRM=99.9 (not locked or CnC not enabled)
N/A CRM=xxxx
CnC
Delay Monitor
N/A CDM? 6 bytes Query only.
When CnC is enabled and the modem is locked, it monitors the delay, in microseconds (µs), of the interferer. Delay is
returned in the form xxxxxx.
EXAMPLE: <0/CDM?
RESPONSE EXAMPLE 1: >0000/CDM=229500 (returns 229,500 µs or 229.5 ms)
RESPONSE EXAMPLE 2: >0000/CDM=999999 (not locked or CnC not enabled)
N/A CDM=xxxxxx
CnC
Freq Offset Monitor
N/A CFM? 6 bytes Query only.
When CnC is enabled, an estimated frequency offset, in kHz, will be calculated between desired and interferer,
Frequency offset is returned in the form xxxx.x.
EXAMPLE: <0/CFM?
RESPONSE EXAMPLE 1: >0000/CFM=+001.0 (1 kHz)
RESPONSE EXAMPLE 2: >0000/CFM=9999.9 (not locked or CnC not enabled)
N/A CFM=xxxx.x
Rx BERT Pattern RBP= RBP? 1 byte, value of 0
thru 6
Command or Query.
Sets or returns the PN loopback pattern type in the form x, where:
0=2^23-1 (DEFAULT)
1=Reserved
2=Reserved
3=Reserved
4=Reserved
5=2047
6=2^15-1
EXAMPLE: <0/RBP=0 (default 2^23-1)
RBP=
RBP?
RBP*
RBP#
RBP=
Tx BERT Pattern TBP= TBP? 1 byte, value of 0
thru 6
Command or Query.
Initialises the PN loopback functionality and sets the pattern type in the form x, where:
0=2^23-1
1=Reserved
2=Reserved
3=Reserved
4=Reserved
5=2047
6=2^15-1
EXAMPLE: <0/TBP=0 (default 2^23-1)
TBP=
TBP?
TBP*
TBP#
TBP=
BERT Error Insert BKE= N/A None Command only.
Inserts a single error.
THIS COMMAND TAKES NO ARGUMENTS.
BKE=
BKE?
BKE#
N/A