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I'm trying to understand the terminology used in the specifications of several satellite systems, such as those outlined on pages 9-11 here.

I'm guessing a mobile uplink/downlink is RF uplink and downlink that can communicate with mobile phones, but I can't find anything in my searches that defines feeder downlink.

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  • Mobile uplink/downlink are channels between the satellite and 'end users': mobile satphones, satcom terminals on ships, aircraft etc.
  • Feeder uplink/downlink are channels between the satellite and a ground station. The ground station is connected to terrestrial phone/data networks.

When a satphone user calls someone who uses a 'normal' landline, the call is routed from the satphone to the satellite (through the mobile up/downlink), then from the satellite to a ground station (through the feeder up/downlink), and the ground station connects the call to the landline phone network.

Usually, a satellite has many mobile links, and one feeder link. The satellite bundles the data from all mobile links into the one feeder link.

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Feeder link is from the Gateway to the satellite Check the image on Slide#3 of the link

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