ARINC 618d4s9

Draft 4 of Supplement 9 to ARINC Specification 618

Last Published: 
Thursday, November 11, 2021
Document status class: 

Draft 4 of Supplement 9 to ARINC Specification 618: Air-Ground Characteristic-Oriented Protocol Specification

The ARINC Industry Activities staff prepared this draft based on recommendations from the DLK Systems Subcommittee online meeting held on September 15-17, 2021, and an online conference held on October 11, 2021.

In support of Internet Protocol operation and the replacement of ARINC 429 communication with Ethernet interfaces between the ARINC 758 CMU and the transceivers, Supplement 9 defines Connectionless VDLM2 and Unnumber (UI) Frames.

Airborne and Ground based ACARS Timers and Counters are updated for usage of UI Frames in Connectionless VDLM2 operation.

The VDLM2 ANSP/DSP Global Base Frequency table is updated.

The ACARS Text Message Character Set is also revised in Supplement 9.

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