ETR 027 : radio equipment and systems: methods of measurement for mobile radio equipment / European Telecommunications Standards Institute
ETR 028 : radio equipment and systems (RES): uncertainties in the measurement of mobile radio equipment characteristics / European Telecommunications Standards Institute
ETR 037 : network aspects: telecommunications management network (TMN): objectives, principles, concepts and reference configurations / European Telecommunications Standards Institute
ETR 038 : business telecommunications (BT): open network provision (ONP) technical requirements: standardisation requirements for ONP leased lines / European Telecommunications Standards Institute