Newtec Proprietary
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R3.2_v1.0
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Feature Descriptions
MDM9000 Satellite Modem
16.7.2 Why ACM?
An ACM system provides two major benefits:
• It always maximizes the throughput of a satellite link.
• It guarantees the availability of the link reception.
The circumstances in which satellite connections are active can change all the time, due to e.g.
changing weather conditions.
Imagine we have an optimal satellite connection between two sites in clear weather.
At this moment the satellite link has the following settings:
• High MODCOD
• High throughput
• Good signal quality
In these ideal circumstances and without fade, a high MODCOD can be used, and the throughput
over the satellite link is high.
Imagine it starts raining heavily at the receiving end.
The consequence is that the signal quality is decreased.
When the rain fade exceeds a maximum, the receiving demodulator is not able to demodulate the
incoming data anymore and the satellite link is interrupted.
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