SHAPING THE FUTURE OF SATELLITE COMMUNICATIONS
Parameter Description
Inband return RF-channel is only possible on
modems.
ModCod selection algo.
This parameter is used to overrule the ModCod selection.
By default the controller determines the algorithm for the
ACM client.
Three possible options:
Option Description
Learn from
ctrl
Use the configuration of the external
EL860 ACM-controller.
Link margin
Use the link margin as selection criteria
to determine if the ModCod must be
changed (up/down).
The actual “link margin estimation” is
derived from the actual ModCod’s stored
threshold that is updated with a value
that is determined by the C/D
estimation.
This way a new threshold is defined by
taking the distortion into account.
Use this in single carrier per
transponder.
(refer to section 8.4.10 for more
information about C/D estimation).
Header Es/No
Use the Es/No as selection criteria to
determine if the ModCod must be
changed.
Use this in a multi-carrier setup in one
transponder. This because C/D can not
be defined accurate enough in a multi-
carrier setup transponder.
(Refer to for more information on
Es/No)
9.1.1.7 QoS and FlexACM
If the link carries IP data, quality of service ensures that real-time data is prioritized
over non-real-time data. This ensures that voice and video is not delayed, and that
web browsing and others is slowed down in case of a reduction of available
throughput due to a lower ModCod selected in case of (e.g.) rain fade.
The QoS ruler (determines which traffic is what class) can be configured in the
modulator. (The EL860 can be used for advanced QoS and shaping rules.)
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