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ACARS

The ACARs system was first introduced to enable aircraft to send their take-off and landing reports automatically to airline computers. today the system is installed in almost all commercial aircraft and is being used for applications that require a very reliable service.  Many corporate aircraft have ACARS systems capable of sending and receiving messages or flight plans to/from specific service provides such as ARINC.  These messages include (PDC) Pre-Departure Clearance, Flight Plans and Flight Plan Availability, Text Weather, WINDS, SIGMETS, and (DATIS) Digital ATIS. The ACARs system is limited, due to its use of vHF voice radios, to using a data rate of 2.4 kilobits per second.

AIRCOM

The ICAO vDL Mode 2 standard specifies the use over the vHF link of a D8PsK (Differentially encoded 8-Phase shift Keying) modulation scheme providing a data rate of 31.5 kbits/ second compared to the vHF ACARs rate of 2.4 kbits/second in the same channel width of 25 kHz.

AIRCOM is implementing new generation services that will initially complement and over the next 10 to 15 years progressively replace ACARs. the AIRCOM next generation services will follow two parallel paths: ICAO-defined vDL and Atn links for Air traffic services (Ats), and IP links for Aircraft Operator Communications (AOC).