IEC 61753-052-3:2016
纤维光学互连器件和无源元件. 性能标准. 第052-3部分: 单模非连接化固定衰减器. 非受控环境下的U类
Fibre optic interconnecting devices and passive components - Performance standard - Part 052-3: Single-mode fibre non-connectorized fixed attenuator - Category U in uncontrolled environment