UNE-EN IEC 61280-4-5:2020

This part of IEC 61280 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 ¼m) multimode optical fibres, as specified in IEC 60793-2-10, and category B-652

and B-657 (9/125 ¼m) 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.