标准摘要
[中文适用范围]： IEC 61280-4 的这一部分适用于使用多模光纤@安装的光纤布线的衰减测量，通常长度可达 2 000 m。该布线可以包括多模光纤@连接器@适配器和接头。 ISO/IEC 11801@ ISO/IEC 24702 和 ISO/IEC 24764 等布线设计标准包含此类布线的规范。支持这些设计标准的ISO/IEC 14763-3@参考了该标准的测试方法。在本标准中，涉及的光纤类型包括 IEC 60793-2-10 中规定的 A1a (50/125 ??) 类和 A1b (62@5/125 ??) 类多模光纤。其他多模类别的衰减测量可以使用本标准的方法@进行，但其他类别的源条件尚未定义。 [外文原描述]： IEC 61280-4-1:2009 is applicable to the measurement of attenuation of installed fibre-optic cabling using multimode fibre, typically in lengths of up to 2 000 m. This cabling can include multimode fibres, connectors, adapters and splices. In this standard, the fibre types that are addressed include category A1a (50/125 µm) and A1b (62,5/125 µm) multimode fibres, as specified in IEC 60793-2-10. The attenuation measurements of the other multimode categories can be made, using the approaches of this standard, but the source conditions for the other categories have not been defined. The main changes with respect to the previous edition are: - An additional measurement method based on optical time domain reflectometry (OTDR) is documented, with guidance on best practice in using the OTDR and interpreting OTDR traces. - The requirement for the sources used to measure multimode fibres is changed from one based on coupled power ratio (CPR) and mandrel requirement to one based on measurements of the near field at the output of the launching test cord. - Highlighting the importance of, and giving guidance on, good measurement practices including cleaning and inspection of connector end faces.
英文名称Fibre-optic communication subsystem test procedures - Part 4-1: Installed cable plant - Multimode attenuation measurement