This document 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 [10]. This document addresses the interoperability of the ATS applications using the Aeronautical Telecommunication Network (ATN). These interoperability requirements are based on a subset of the International Civil Aviation Organization (ICAO) Manual of Technical Provisions for the ATN (ICAO Document 9880 [5]) defining the Context Management (CM) application, the Controller-Pilot Data Link Communications (CPDLC) application and the Automatic Dependent Surveillance Contract (ADS-C) application.