本EN（协调标准）规定了指令91/263/EEC第4（d）条和第4（f）条下的技术特性（电气和机械接口要求和接入协议），由单端设备提供，该设备旨在（a）获得泛欧认证，（b）通过两根电线连接到PSTN的模拟接口。该接口的特点是直流环路占用和清除，使用语音通带以下的低频交流振铃来指示传入呼叫，在传输阶段，网络终端的带宽约为3kHz，以及（c）支持任何电话服务。

This EN (harmonised standard) specifies the technical characteristics (electrical and mechanical interface requirements and access protocol) under Articles 4(d) and 4(f) of Directive 91/263/EEC to be provided by a single terminal equipment which is intended (a) for pan-European approval and (b) for connection by two wires to an analogue interface of the PSTN. This interface is characterized by d.c. loop seizure and clearing, uses low frequency a.c. ringing below the speech passband to indicate an incoming call and in the transmission phase has an approximate bandwidth of 3kHz at the network termination point, and (c) for supporting any telephony service.