SHAPING THE FUTURE OF SATELLITE COMMUNICATIONS
9.1.1.4 FlexACM Configuration
Following steps, as described in Figure 74, are used to configure and activate the
FlexACM feature.
The margin information to be used by the demodulator is configured via the
management platform in the modulator.
The ACM controller application:
- Forwards the margin information towards the ACM client application on the
demodulator.
- Enables or disables the ACM feature on the modulator and demodulator;
The ACM client application:
- Sends feedback messages including ModCod change requests towards
the ACM controller application on the modulator;
The ACM controller application on the modulator/EL860 changes the ModCod.
9.1.1.5 FlexACM Control
The ACM controller is used to configure and activate/deactivate the FlexACM
feature.
EL470 >> Modem >> Control >> Modulation >> ACM control
The following parameters can be defined.
Parameter Description
ACM Ctrl
Enables or Disables the ACM controller
MIN ModCod
This is the lowest ModCod that is set by the ACM controller.
For example when Max ModCod=32APSK 9/10 set the Min
ModCod=QPSK3/4.
Max ModCod
This is the maximum ModCod used. This is defined in the link
budget. Set this parameter always a few ModCods higher
then what has been defined in the link budget for optimal
performance.
Comm failure ModCod
This is the fallback ModCod to ensure that the link stays up
as long as possible. Set this parameter to the Lowest
ModCod defined in the MIN ModCod parameter.
Min margin
This is the minimum margin (step down margin) (refer to
Figure 79) needed to stay in a certain ModCod. When a
lower margin is reached a lower ModCod is selected.
This is different per ModCod.
Tgt margin
This is the target margin (step up margin), this is an added
margin that is needed to select a higher ModCod. (Refer to
Figure 78.)
This is different per ModCod.
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