本标准描述了电信网络和客户装置之间的接口，包括其相互作用和电气特性。本标准的要求适用于单个非对称数字用户线（ADSL）。ADSL允许提供语音带服务（包括高达56 kbit/s的POTS和数据服务）和各种数字信道。

This standard describes the interface between the telecommunications network and the customer installation in terms of their interaction and electrical characteristics. The requirements of this standard apply to a single asymmetric digital subscriber line (ADSL). ADSL allows the provision of voiceband services (including POTS and data services up to 56 kbit/s) and a variety of digital channels.