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. Revision B takes into account results from SESAR and NextGen validation exercises, and maintaining portable data link services and applications independent, to the maximum extent practical, of the underlying network technology. Revision B will take into account results from SESAR and NextGen validation exercises. It will also align the standard to relevant ICAO documentation and remove the D-RNP Requirements. https://www.eurocae.net/news/posts/2023/october/ed-229b-interoperabilit… 09/23