Comtech EF Data CDM-750 - Manual (Page 206)

CDM-750 Advanced High-Speed Trunking Modem Revision 2
Serial-based Remote Product Management MN-CDM750
7–26
7.5.6 ACM Parameters
Parameter
Type
Command
(Instruction
& Qualifier)
Number of
Arguments
Description of Arguments
Response to
Command
Query
(Instruction &
Qualifier)
Response to Query
ACM
Operating
Parameters
ACM= 7 bytes Command or Query.
Set or return ACM operating parameters in the form mmMMATT, where:
mm = Minimum ModCod, range is 1 to 28
MM = Maximum ModCod, range is 1 to 28
A = Defines action on remote demod unlock (0=go to minimum Tx ModCod, 1=maintain Tx ModCod)
TT = Target EsNo Margin, from 0 to 45 that is ten times the EsNo in dB (from 0.0dB to 4.5dB).
Example: ACM=0121010 (Sets min ModCod=1, max ModCod=21, Go to minimum Tx ModCod when remote
demod unlocks, sets Target Es/No at 1.0dB.)
ACM
ACM?
ACM*
ACM#
ACM? ACM=mmMMATT
(see Description of
Arguments)
ACM
Degradation
Configuration ADC= 8 bytes Command or Query.
Set or return ACM configuration parameters in the form qqeesstt, where:
qq = QPSK degradation in dB from 0.0 to 9.9
ee = 8PSK degradation in dB from 0.0 to 9.9
ss = 16APSK degradation in dB from 0.0 to 9.9
tt = 32APSK degradation in dB from 0.0 to 9.9
Example: ADC=03050717 (Sets QPSK degradation to 0.3 dB, 8PSK degradation to 0.5 dB, 16APSK degradation
to 0.7 dB, 32APSK degradation to 1.7 dB – these are the factory default parameters)
ADC=
ADC?
ADC*
ACC#
ADC? ADC=qqeesstt
(see Description of
Arguments)
Remote
Es/No N/A 4 bytes Query only.
Returns the value of the remote demod Es/No, in dB, resolution 0.1 dB, in the form xx.x.
Responds 99.9 = demod is unlocked.
Example: RES=12.4 (selects Es/No = 12.4 dB)
N/A RES? RES=xx.x
(see Description of
Arguments)
Remote
Signal to
Noise Ratio
N/A 4 bytes Query only.
NOTE: Same as RES?
RSN remains for backwards compatibility
N/A RSN? RSN=xx.x
(see Description of
Arguments)
Local
Es/No N/A 4 bytes Query only.
Returns the value of Local Es/No, resolution 0.1 dB, in the form xx.x.
Returns 99.9 if demod is unlocked.
Example: LES=12.3 (selects Es/No = 12.3 dB)
N/A LES? LES=xx.x
(see Description of
Arguments)
Local Signal to
Noise Ratio N/A 4 bytes Query only.
NOTE: Same as LES?
SNR remains for backwards compatibility
N/A SNR? SNR=xx.x
(see Description of
Arguments)
ACM Local
Es/No Ratio N/A 4 bytes Query only.
NOTE: Same as LES?
ESN remains for backwards compatibility
N/A ESN? ESN=xx.x
(see Description of
Arguments)