scope:

This document is applicable to the measurement of attenuation of installed optical fibre cabling 289 plant using multimode optical fibre. This cable plant can include multimode optical fibres, 290 connectors, adapters, splices, and other passive devices. The cabling may be installed in a 291 variety of environments including residential, commercial, industrial, and data centre premises, 292 as well as outside plant environments. The test equipment used in this standard has a single fibre 293 connector interface to test one fibre at a time; or sometimes a duplex interface that may be used to test a 294 pair of fibres, often testing one fibre of the pair in each direction. 295 In this standard, the optical fibres that are addressed include sub-categories A1-OMx, where x = 296 2, 3, 4 and 5 (50/125 μm) and A1-OM1 (62,5/125 μm) multimode optical fibres, as specified in 297 IEC 60793-2-10. The attenuation measurements of the other multimode categories can be made 298 using the approaches of this standard, but the source conditions for the other categories have 299 not been defined.