21.		Attachments to the public switched telephone network (PSTN) : category II attachment requirements for 1200 bits per second half duplex and 1200/75 bits per second asymmetrical duplex modems standardized for use on the PSTN: NET 24 / European Conference of Postal and Telecommunications Administrations Data Publicação: 1992 Tema: Vária
22.		Integrated services digital network (ISDN) : 3.1 kHz telephony teleservice: attachment requirements for handset terminals: NET 33 / European Conference of Postal and Telecommunications Administrations Data Publicação: 1992 Tema: Vária
23.		Approval requirements for data terminal equipment to connect to packet switched public data networks using CCITT recommendation X.25 (1984) interface : NET 2 / European Conference of Postal and Telecommunications Administrations Data Publicação: 1988 Tema: Vária
24.		Approval requirements for terminal equipment to connect to packet integrated services digital network (ISDN) using ISDN basic access : NET 3 / European Conference of Postal and Telecommunications Administrations Data Publicação: 1988 Tema: Vária
25.		Radio equipment and systems : narrow-band direct-printing telegraph equipment for receiving meteorological or navigational information (NAVTEX): technical characteristics and methods of measurements: report form for testing to ETS 300 065: March 1993 / European Conference of Postal and Telecommunications Administrations Data Publicação: 1993 Tema: Vária
26.		Radio equipment and systems : radiotelex equipment operating in the maritime MF/HF service: technical characteristics and methods of measurements: report form for testing to ETS 300 067: March 1993 / European Conference of Postal and Telecommunications Administrations Data Publicação: 1993 Tema: Vária
27.		Radio equipment and systems : narrow-band direct-printing telegraph equipment for receiving meteorological or navigational information (NAVTEX): technical characteristics and methods of measurements: application form for testing to ETS 300 065: March 1993 / European Conference of Postal and Telecommunications Administrations Data Publicação: 1993 Tema: Vária
28.		Radio equipment and systems : radiotelex equipment operating in the maritime MF/HF service: technical characteristics and methods of measurements: application form for testing to ETS 300 067: March 1993 / European Conference of Postal and Telecommunications Administrations Data Publicação: 1993 Tema: Vária
29.		Technical characteristics and test conditions for radio equipment with an internal of external RF connector intended primarily for analogue speech : report form for testing to ETS 300 086: 1992 / European Conference of Postal and Telecommunications Administrations Data Publicação: 1992 Tema: Vária
30.		Technical characteristics and test conditions for radio equipment with an internal of external RF connector intended primarily for analogue speech : report form for testing to ETS 300 086: 1993 / European Conference of Postal and Telecommunications Administrations Data Publicação: 1993 Tema: Vária