ED-228B provides the operational, safety, and performance requirements (SPR) for the implementation of data communication services that support air traffic services (ATS). It is intended to support the communication element of the implementation of communication, navigation, and surveillance / air traffic management (CNS/ATM) systems in worldwide application. Revision B takes into account results from SESAR and NextGen validation exercises. It also aligns the standard to relevant ICAO documentation and removes the D-RNP Requirements. Corrigendum 1 corrects purely editorial errors.