"Model" application form to test laboratory / European Conference of Postal and Telecommunications Administrations
"Model" test report form / European Conference of Postal and Telecommunications Administrations
Attachments to the public switched telephone network (PSTN) : basic attachment requirements for modems standardized for use on the PSTN: NET 20 / European Conference of Postal and Telecommunications Administrations
Attachments to the public switched telephone network (PSTN) : category II attachment requirements for 300 bits per second duplex modems standardized for use on the PSTN: NET 21 / European Conference of Postal and Telecommunications Administrations