IEC 61280-4-5:20 20适用于使用具有MPO接口的测试设备测量已安装的多模和单模光纤布线设备的衰减以及极性和长度的确定，这些设备端接有MPO连接器。该布线设备可以包括多模或单模光纤、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。在本文件中，所述光纤包括A1-OMx子类别，其中x=2、3、4和5(50/125 μ m)多模光纤，如IEC 60793-2-10中规定的，以及B-652和B-657(9/125 μ m)单模光纤，如IEC 60793-2-10中规定的。2-50.其他多模和单模类别的衰减测量也可以使用光源和功率计(LSPM)或光时域反射计(OTDR)进行，所述光时域反射计利用具有一个MPO接口的内部或外部光开关。使用850nm源进行多模测量，因为用于具有MPO接口的并行光学应用的收发器仅在850nm处操作；1300 nm测量是可选的。使用1310nm和/或1550nm源进行单模测量，因为用于具有MPO接口的并行光学应用的收发器在这些波长下操作。本文档不包括非专用于MPO到MPO的布线描述。 2022年1月勘误表的内容已包含在本副本中。

IEC 61280-4-5:2020 is applicable to the measurement of attenuation and determination of polarity and length of installed multimode and single-mode optical fibre cabling plant, terminated with MPO connectors, using test equipment having an MPO interface. This cabling plant can include multimode or 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. In this document, the optical fibres that are addressed include sub-categories A1-OMx, where x = 2, 3, 4 and 5 (50/125 μm) multimode optical fibres, as specified in IEC 60793-2-10, and category B-652 and B-657 (9/125 μm) single-mode optical fibres, as specified in IEC 60793-2-50. The attenuation measurements of the other multimode and single-mode categories can also be made using a light source and power meter (LSPM) or optical time domain reflectometer (OTDR) utilising an internal or external optical switch having one MPO interface. Multimode measurements are made with an 850 nm source because transceivers used for parallel optics applications having an MPO interface only operate at 850 nm; 1 300 nm measurements are optional. Single-mode measurements are made with a 1 310 nm and/or 1 550 nm source because transceivers used for parallel optics applications having an MPO interface operate at these wavelengths. This document does not include descriptions of cabling that is not exclusively MPO to MPO.
The contents of the corrigendum of January 2022 have been included in this copy.