Contents
What is VDL aviation?
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.
What type of communication does ACARS provide?
Description. ACARS (pronounced AY-CARS) is a digital data link system for the transmission of messages between aircraft and ground stations, which has been in use since 1978.
Does CPDLC use satcom?
CPDLC can be used by itself, without ADS-C, and can be transmitted via VHF of SatCom with relatively low latency – basically the message gets where it need to go right away with practically un-noticeable delay. CPDLC text messages are entered on the flight crews CDU (control display unit) keypad.
Where is CPDLC used?
CPDLC is a two-way data-link system by which controllers can transmit non urgent strategic messages to an aircraft as an alternative to voice communications. The message is displayed on a flight deck visual display. The CPDLC application provides air-ground data communication for the ATC service.
What is the function of ACARS?
A major function of ACARS is to automatically detect and report the start of each major flight phase, called OOOI events in the industry (out of the gate, off the ground, on the ground, and into the gate). These OOOI events are detected using input from aircraft sensors mounted on doors, parking brakes, and struts.
What’s the difference between ACARS, CPDLC, and fir?
CPDLC is an ATC tool, and ACARS is a company tool but it can be used to relay messages to/from ATC. CPDLC coverage is not global yet, it depends on the FIR to have it. CPDLC utilizes VHF Data Link (VDL) and satcom. ACARS uses VHF, VDL, HF, HFDL, and satcom.
Which is the best VDL Mode for CPDLC?
Mode 2 is the only VDL mode being implemented operationally to support Controller Pilot Data Link Communications (CPDLC). The ICAO AMCP defined this Mode for validation purposes.
Which is the ICAO version of VDL Mode 2?
The ICAO VDL Mode 2 is the main version of VDL. It has been implemented in a Eurocontrol Link 2000+ program and is specified as the primary link in the EU Single European Sky rule adopted in January 2009 requiring all new aircraft flying in Europe after January 1, 2014 to be equipped with CPDLC.
What are the sublayers of VDL Mode 2?
The VDL Mode 2 Link Layer is made up of two sublayers: a Data Link service and a media access control (MAC) sublayer. The Data Link protocol is based on the ISO standards used for dial-up HDLC access to X.25 networks.