Fibre optic interconnecting devices and passive components - Performance standard - Part 052-6: Single-mode fibre non-connectorized fixed attenuator - Category O in outside plant environment (IEC 61753-052-6:2016); German version EN 61753-052-6:2016
纤维光学互连器件和无源元件.性能标准.第052-6部分:单模纤维非连接固定衰减器.外部工厂环境中的O类(IEC 61753-052-6-2016);德文版EN 61753-052-6:2016