Attachments to the public switched telephone network (PSTN) : category II attachment requirements for 1200 bits per second duplex modems standardized for use on the PSTN: NET 22 / European Conference of Postal and Telecommunications Administrations
Attachments to the public switched telephone network (PSTN) : category II attachment requirements for 2400 bits per second duplex modems standardized for use on the PSTN: NET 23 / European Conference of Postal and Telecommunications Administrations
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
Integrated services digital network (ISDN) : 3.1 kHz telephony teleservice: attachment requirements for handset terminals: NET 33 / European Conference of Postal and Telecommunications Administrations