本文件适用于设备接口。设备内的这些接口可以连接到电信网络，或者它们可以构成电信网络基础设施的一部分，或者它们可以提供数据的本地化传输。本文件在分析电信网络特性后，根据EN 60950和EN 41003中定义的电路类型，提供接口分类指南。本文件涵盖的设备示例包括但不限于:传真机、关键电话系统、网络计费设备、PABX、网络监控设备、电话应答机、网络交换设备、网络传输设备、网络终端设备、调制解调器、电话机和网络供电设备。

This document applies to equipment interfaces. These interfaces within the equipment may be connected to TELECOMMUNICATIONS NETWORKS, or they may form part of the TELECOMMUNICATIONS NETWORK infrastructure, or they may provide localized transfer of data. This document provides guidance on the classification of interfaces in accordance with the circuit types defined in EN 60950 and EN 41003 following an analysis of the telecommunication network's characteristics. Examples of equipment covered by the present document include, but are not limited to: facsimile machines, key telephone systems, network billing equipment, PABXs, network supervisory equipment, telephone answering machines, network switching equipment, network transmission equipment, network terminating equipment, modems, telephone sets, and network power feeding equipment.