本标准以标准速率建立了与电气接口应用的网络接口（NI）相关的同步光网络（SONET）接口的物理特性和技术标准。本文涵盖的标准包括SONET物理介质相关（PMD）标准（如电气参数和连接器），以及符合NI电气规范和连接客户安装设备正确接口的其他必要标准。遵守本标准旨在确保SONET NI的兼容性，不应被视为对网络或客户安装设备内部操作的限制。本标准的规定旨在符合有关安全和环境条件的适用要求。

This standard establishes physical characteristics and technical criteria for Synchronous Optical NETwork (SONET) interfaces, at standard rates, associated with the Network Interface (NI) for electrical interface applications. Criteria covered herein include SONET Physical Media Dependent (PMD) criteria (such as electrical parameters and connectors), and other necessary criteria for compliance with the electrical specification at the NI and the proper interfacing of the connecting customer installation equipment. Compliance with this standard is intended to ensure compatibility at the SONET NI and should not be construed as a constraint on the internal operations of the network or customer installation equipment. The provisions of this standard are intended to be consistent with applicable requirements concerning safety and environmental conditions.