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 Services (Route). 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).
Read more about VHF Data Link: ICAO VDL Mode 1, ICAO VDL Mode 2, ICAO VDL Mode 3, ICAO VDL Mode 4
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