ARINC 631d2s9

Draft 2 of Supplement 9 to ARINC Specification 631

Last Published: 
Thursday, May 27, 2021
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Draft 2 of Supplement 9 to ARINC Specification 631: VHF Digital Link (VDL) Mode 2 Implementation Provisions

The Industry Activities staff prepared this draft based on recommendations from the Datalink (DLK) Systems Subcommittee meetings held November 16-20, 2020; March 30, and April 6, 2021 online.

Draft 2 defines Connectionless VDLM2. Unnumbered (UI) Frames for Connectionless VDLM2 operation is defined. Connectionless will use  UI Frames instead of the INFO Frames used in the existing Connection-oriented VDLM2 operation. UI Frame addressing is specified. Connectionless VDLM2 is expected to support the exchange VDL IP packets for ATN/IPS operation.

Draft 2 also specifies how the aircraft reports its perceived RF Channel Utilization to the VDLM2 ground network. It also defines how to report the number of channel congestion events.

All technical changes are shown in blue bold. Text that has been deleted may or may not be shown in strikethrough depending on the extent of the deletions.

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