本标准为多模光纤同步光网络（SONET）网络到客户的安装接口建立了物理介质相关（PMD）规范。本文涵盖的标准包括SONET PMD标准（如光学参数和连接器），以及符合NI光学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。

This standard establishes physical media dependent (PMD) specifications for Multi-Mode Fiber Synchronous Optical NETwork (SONET) network to customer installation interfaces. Criteria covered herein include SONET PMD criteria (such as optical parameters and connectors), and other necessary criteria for compliance with the optical 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.