Acm Parameters; Parameters - Comtech EF Data CDM-750 Installation And Operation Manual

CDM-750 Advanced High-Speed Trunking Modem
Appendix D
D.6.5

ACM Parameters

Command
Parameter Number of
(Instruction
Type Arguments
& Qualifier)
ACM Operating ACM= 7 bytes

Parameters

ACM ADC= 8 bytes
Degradation
Configuration
ACM Remote
N/A 4 bytes
Signal Noise
Ratio
ACM Local
N/A 4 bytes
Signal Noise
Ratio
Descriptiono of Arguments
Command or Query.
Defines ACM operating parameters in the form mmMMATT, where:
mm=Minimum ModCod, range is 04 to 28
MM=Maximum ModCod, range is 04 to 28
A=Defines action on remote demod unlock (0=go to minimum Tx ModCod,
1=maintain Tx ModCod)
TT=Target EsNo Margin, from 00 to 45 that is ten times the EsNo in dB (from
0.0dB to 4.5dB).
Example: ACM=0421110 (Sets min ModCod=4, max ModCod=21,
maintain Tx ModCod when remote demod unlocks, sets Target Es/No at 1.0dB.)
Command or Query.
Defines 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)
Query only.
Returns the value of remote demod Signal Noise Ratio (Es/No) in the form xx.x:.
Returns 99.9 if demod is unlocked.
Returns xx.x if not in ACM.
Example: RSN=12.4 (SNR=12.4 dB)
Query only.
Returns the value of Local Signal Noise Ratio (Es/No) in the form xx.x:
Resolution = 0.1 dB.
Returns 99.9 if demod is unlocked.
Example: SNR=12.3 (SNR=12.3 dB)
D–23
Query
Response to
(Instruction &
Command
Qualifier)
ACM ACM? ACM=mmMMATT
ACM? (see Description of
Arguments)
ACM*
ACM#
ADC= ADC? ADC=qqeesstt
ADC? (see Description of
Arguments)
ADC*
RSN=xx.x
N/A RSN?
(see Description of
Arguments)
SNR=xx.x
N/A SNR?
(see Description of
Arguments)
Revision 1
MN-CDM750
Response to Query