This standard provides the interoperability requirements (INTEROP) standard for the implementation of the Air Traffic Service (ATS) applications supporting the Baseline 2 data link services as specified in the Baseline 2 Safety and Performance Requirements (SPR) document DO-350. This document addresses the interoperability of the ATS applications using the Aeronautical Telecommunication Network (ATN). It represents the minimum set of interoperability requirements and allocations necessary to provide adequate assurance that the elements of the communication@ navigation@ and surveillance / air traffic management (CNS/ATM) system are compatible with each other and when operating together will perform their intended function. These elements comprise the aircraft system@ the Air Traffic Service Provider (ATSP) system@ and the operator's provisions to use the air traffic services.