A message or data downlink means…
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A
a transmission of signals from an aircraft in flight to a station on the Earth.
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B
uploading ATIS / weather / maintenance data to an airborne unit.
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C
downloading and printing the ATC clearance from the Controller Pilot Data Link Communication (CPDLC).
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D
downloading ATIS / weather / maintenance data from a ground control unit via the onboard Internet connection.
Refer to figure.
To overcome many of the problems with voice communications, data link services have been developed. A data link is a means of connecting one location to another, for the purpose of transmitting and receiving information.
Data links may be established on any frequency, but will require additional equipment on both the ground and the aircraft.
The transmission of signals from an earth station to a satellite or airborne platform is known as an Uplink.
The transmission of signals from a satellite or airborne platform to an earth station is known as a Downlink.
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Austro Control1
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