DO-219 is a communications standard published by RTCA, Incorporated.
It contains Minimum Operational Performance Standards (MOPS) for aircraft equipment required for Air Traffic Control (ATC) Two-Way Data Link Communications (TWDL) services.
TWDL Services are one element of Air Traffic Services Communication (ATSC).
ATSC addressing requirements are supported by the Context Management (CM) Service.
The Aeronautical Telecommunications Network (ATN) provides the media and protocols to conduct data link Air Traffic Services Communication.