标准号:IEC 61280-4-2:2024 RLV EN 28a833ef标准名称:IEC 61280-4-2:2024 RLV EN 28a833ef英文名称:Fibre-optic communication subsystem test procedures - Part 4-2: Installed cabling plant - Single-mode attenuation and optical return loss measurements标准状态:发布日期:2024-12-14实施日期:0出版语种:EN归口单位:TC 86/SC 86C提出部门:IEC发布部门:IEC