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Old 08-14-2014, 7:56 PM
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ATCTech ATCTech is offline
Join Date: Aug 2002
Location: Central Halton County, Ontario Canada
Posts: 812

Besides being used in trans-oceanic airspace and parts of Europe, CPDLC is deployed in domestic airspace across Canada by NAV Canada, the ATC provider here. CPDLC messages are relayed by satellite, by VDL2 (136.975 MHz) and by HF (HFDL), in that order of network preference. (Obviously depending on what system the aircraft is logged into at the time.)

I have compared some internal ATC system message transactions exchanged with specific flights against VDL2 messages using MultiPSK to receive the 136.975 MHz data. They are not plain other ACARS-type messages. Even the standard log-on "Welcome" message cannot be seen as plain text over the air.

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