IEC 61753-052-6:2016包含了光纤衰减器满足的最低初始测试和测量要求以及严格程度，以便归类为满足在外部工厂环境中使用的单模光纤非连接固定衰减器设备的要求。IEC 60869-1包含光衰减器的通用规范。本文件中规定的光学性能仅适用于非连接式光学衰减器。 关键词:非连接固定衰减器装置，工厂外部环境中的O类

IEC 61753-052-6:2016 contains the minimum initial test and measurement requirements and severities which a fibre optic attenuator satisfies in order to be categorised as meeting the requirements of single-mode fibre non-connectorized fixed attenuator devices used in outside plant environments. IEC 60869-1 contains the generic specification of the optical attenuator. Optical performances specified in this document relate only to non-connectorized optical attenuators. Keywords: non-connectorized fixed attenuator devices, Category O in outside plant environments