This document provides the interoperability requirements for an aeronautical telecommunication network for Baseline 2 ATS data communication services (B2) ground system that provides B2 air traffic data link services to future air navigation system 1/A (FANS 1/A) aircraft in oceanic and continental airspace. Revision B takes into account results from SESAR and NextGen validation exercises, maintaining portable data link services and applications independent, to the maximum extent practical, of the underlying network technology.