Comtech EF Data CDM-750, Installation And Operation Manual

Page: 192 / 300

CDM-750 Advanced High-Speed Trunking Modem Revision 2
Serial-based Remote Product Management MN-CDM750
7–14
Parameter
Type
Command
(Instruction
& Qualifier)
Number of
Arguments
Description of Arguments
Response to
Command
Query
(Instruction &
Qualifier)
Response to Query
Rx Data Rate N/A 10 bytes Query only.
Returns Rx Data Rate,in Kbps, in the form xxxxxx.xxx
Example: RDR=002047.999 (In Kbps)
N/A RDR? RDR=xxxxxx.xxx
(see Description of
Arguments)
Rx Spectrum
Invert
N/A 1 byte, value
of 0 or 1
Query only.
Returns Rx Spectrum Invert in the form x, where:
0 = Normal
1 = Rx Spectrum Inverted
Example: RSI=0 (selects Normal)
N/A RSI? RSI=x
(see Description of
Arguments)
Rx Alpha
Rolloff N/A 1 byte, value
of 0 thru 2 Query only.
Returns Rx Alpha Rolloff in the form x, where:
0 = 20%
1 = 25%
2 = 35%
Example: RAR=0 (reports Rx Alpha Rolloff of 20%)
N/A RAR? RAR=x
Rx Gold Code
Sequence
Index
RGS= 6 bytes Command or Query.
Set or return Rx Gold Code Sequence Index in the form xxxxxx, where:
Gold Code Sequence index = 000000 to 262141
Example: RGS=189063
RGS=
RGS?
RGS*
RGS#
RGS? RGS=xxxxxx
Rx Pilot N/A 1 byte, value
of 0 or 1 Query only.
Returns Rx Pilot status in the form x, where:
0 = Off
1 = On
Example: RPI=0 (selects Pilots Off)
NOTE: This is automatically detected on demod acquisition, but if the unit is not locked, the query returns ‘x’.
N/A
RPI? RPI=x
Es/No Alarm
Point EBA= 4 bytes Command or Query.
Set or return Es/No alarm point in dB, Resolution=0.1 dB, in the form xx.x, where:
xx.x = range between 0.1 and 25 dB.
Example: EBA=12.3
EBA=
EBA?
EBA*
EBA#
EBA? EBA=xx.x
(see Description of
Arguments)
Minimum Data
Rate
(MultiStream
Mode)
N/A 10 bytes Query only.
Applies to MultiStream Mode. Returns the minimum data rate of the modem, in the form xxxxxx.xxx.
In MultiStream mode, the minimum data rate calc is EDR + MDR = TDR where:
MDR = (PIIC1 + PIIC2) * 1.015 for Normal Frames
MDR = (PIIC1 + PIIC2) * 1.05 for Short Frames
In non-MultiStream mode (Ethernet Only): MDR = TDR
In non-MultiStream mode (Assume PIIC 1 G703-E3): MDR = TDR
N/A MDR? MDR=xxxxxx.xxx
(see Description of
Arguments)