本标准规定了网络到客户安装和各种客户场所设备之间的ISDN主要速率电气接口规范的要求。要求包括电气特性、格式参数和物理特性。本标准提供接口兼容性信息，并非设备规范。

This standard provides the requirements for ISDN primary rate electrical interface specifications for a network to customer installation and between various customer premises equipment. Requirements include electrical characteristics, format parameters and physical characteristics. This standard provides interface compatibility information and is not meant to be an equipment specification.