IEC 61280-4-2:20 24作为IEC 61280-4-2:20 24 RLV提供，其中包含国际标准及其红线版本，显示了与上一版本相比技术内容的所有变化。IEC 62180-4-2:20 24适用于测量使用单模光纤的已安装光纤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、接头和其他无源设备。电缆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，以及工厂外部环境。本文件适用于所有单模光纤类型，包括IEC 60793-2-50指定为B类光纤的类型。本文件的原理可应用于包含分支装置（分路器）的布线设备，并且在部署无源波长选择性组件的情况下在特定波长范围内，CWDM和DWDM设备。本文件不适用于包括光纤放大器或动态通道均衡器等有源设备的布线设备。这第三版取消并取代了2014年出版的第二版。本版构成技术修订版。与上一版相比，此版本包括以下重大技术变更: a)增加了设备线方法； b)增加与测试帘线等级相关的测试限调整； c)测量不确定性的改进。

IEC 61280-4-2:2024 is available as IEC 61280-4-2:2024 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the 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.