光纤通信子系统测试程序 第4-2部分：已安装的布线设备 单模衰减和光回波损耗测量

[中文适用范围]： 本部分IEC 61280适用于使用单模光纤测量已安装的光纤电缆布线设备的衰减和光回波损耗。该布线设备可以包括单模光纤、连接器、适配器、接头和其他无源器件。布线可以安装在各种环境中，包括住宅、商业、工业和数据中心场所，以及外部工厂环境。 本文件适用于所有单模光纤类型，包括IEC 60793-2-50中指定的B类光纤。 本文件的原理可应用于包含分支设备（分路器）和在部署无源波长选择组件（如WDM、CWDM和DWDM设备）的特定波长范围内的电缆布线设备。 本文件不适用于包括有源设备（如光纤放大器或动态通道均衡器）的电缆布线设备。 [外文原描述]： IEC 61280-4-2:2024 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition. IEC 62180-4-2:2024 is applicable to the measurements of attenuation and optical return loss of an installed optical fibre cabling plant using single-mode fibre. This cabling plant can include single-mode optical fibres, connectors, adapters, splices, and other passive devices. The cabling can be installed in a variety of environments including residential, commercial, industrial and data centre premises, as well as outside plant environments. This document is applicable to all single-mode fibre types including those designated by IEC 60793-2-50 as Class B fibres. The principles of this document can be applied to cabling plants containing branching devices (splitters) and at specific wavelength ranges in situations where passive wavelength selective components are deployed, such as WDM, CWDM and DWDM devices. This document is not intended to apply to cabling plants that include active devices such as fibre amplifiers or dynamic channel equalizers. This third edition cancels and replaces the second edition published in 2014. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) addition of the equipment cord method; b) addition of test limit adjustment related to test cord grades; c) refinements on measurement uncertainties.