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20-Mar-2016 08:12

The VHF Data Link or VHF Digital Link (VDL) is a means of sending information between aircraft and ground stations (and in the case of VDL Mode 4, other aircraft).Aeronautical VHF data links use the band 117.975–137 MHz assigned by the International Telecommunication Union to Aeronautical mobile (R) service.

In advance of CPDLC implementation, VDL Mode 2 has already been implemented in approximately 2,000 aircraft to transport ACARS messages simplifying the addition of CPDLC.The MAC protocol is a version of Carrier Sense Multiple Access (CSMA).There are ARINC standards for ACARS on VHF and other data links installed on approximately 14,000 aircraft and a range of ICAO standards defined by the Aeronautical Mobile Communications Panel (AMCP) in the 1990s.Mode 2 is the only VDL mode being implemented operationally to support Controller Pilot Data Link Communications (CPDLC).

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The ICAO AMCP defined this Mode for validation purposes.

It was the same as VDL Mode 2 except that it used the same VHF link as VHF ACARS so it could be implemented using analog radios before VHF Digital Radio implementation was completed.



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