Fibre-optic communication subsystem test procedures - Part 4-1: Installed cabling plant - Multimode attenuation measurement (IEC 61280-4-1:2019/COR1:2020); German version EN IEC 61280-4-1:2019/AC:2020-05
光纤通信子系统试验程序.第4-1部分:已安装的布线设备.多模衰减测量(IEC 61280-4-1-2019/COR1-2020);德国版本EN IEC 61280-4-1:2019/AC:2020-05