Comtech EF Data CDM-750 - Manual (Page 219)

CDM-750 Advanced High-Speed Trunking Modem Revision 2
Serial-based Remote Product Management MN-CDM750
7–39
Parameter
Type
Command
(Instruction
& Qualifier)
Number of
Arguments
Description of Arguments
Response to
Command
Query
(Instruction &
Qualifier)
Response to Query
Faults and
Status (cont.)
03=CnC Lock
04=Output Data
05=Es/No
06=PLL
07=General Test Fault
08= PIIC1 Buffer Overflow
09= PIIC1 Buffer Underflow
10= PIIC1 Buffer PLL
11= PIIC2 Buffer Overflow
12= PIIC2 Buffer Underflow
13= PIIC2 Buffer PLL
14= DeComp Inv
15 =General Test - Rx forced Good
16=LNB Current
17=LNB Voltage
d = Change in modem fault status since last poll
0=unchanged
1=changed
e = Change in modem configuration since last poll
0=unchanged
1=changed
xx=spares
CnC
Ratio Monitor
N/A 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 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)
N/A CRM? CRM=xxxx
(see Description of
Arguments)
CnC
Delay Monitor
N/A 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 1: CDM=229500 (returns 229,500 µs or 229.5 ms)
Example 2: CDM=999999 (not locked or CnC not enabled)
N/A CDM? CDM=xxxxxx
(see Description of
Arguments)
CnC
Freq Offset
Monitor
N/A 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 1: CFM=+001.0 (1 kHz)
Example 2: CFM=9999.9 (not locked or CnC not enabled)
N/A CFM? CFM=xxxx.x
(see Description of
Arguments)