本标准以与网络接口（NI）相关的标准速率为同步光网络（SONET）接口建立了通用标准。本标准涵盖的标准包括SONET段、线路和路径层的维护和操作功能，以及符合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 common criteria for Synchronous Optical NETwork (SONET) interfaces at standard rates associated with the Network Interface (NI). Criteria covered in this standard include maintenance and operation functionality at the SONET Section, Line and Path layers, and other necessary criteria for compliance with 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.