DIN EN IEC 61280-4-1:2024-04

This part of IEC 61280 is applicable to the measurement of attenuation of installed optical fibre cabling plant using multimode optical fibre. This cabling plant can include multimode 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. The test equipment used in this document has one single fibre connector interface or two single fibre connector interfaces. In this document, the optical fibres that are addressed include sub-categories A1-OMx, where×= 2, 3, 4 and 5 (50/125 µm) and A1-OM1 (62,5/125 µm) multimode optical fibres, as specified in IEC 60793-2-10. The attenuation measurements of the other multimode categories can be made using the approaches of this document, but the source conditions for the other categories have not been defined. The document describes the standardization before the measurement and the different applications of the measurement procedures and their implementation. It should be noted that not all fibre types should be tested using the measurements presented here. Further details can be found in the scope of application. The standard differs from DIN EN IEC 61280-4-1 (VDE 0888-410):2020-07 and DIN EN IEC 61280-4-1 Corrigendum 1 (VDE 0888-410 Corrigendum 1):2020-09 as follows: a) changes in Annex F concerning limited luminous flux to harmonize with IEC TR 62614-2, but without changing the limits for limited luminous flux defined in Tables F.2 to F.5; b) addition of a procedure with device cables in Annex D; c) inclusion of a test for bend-insensitive multimode fibres; d) updates to measurement uncertainty; e) definition of additional cabling configurations; f) changes to Table 5 on spectral requirements. The standard is used by measuring equipment manufacturers, installers of fibre optic cabling systems, data center operators, experts, and end users for testing, troubleshooting, and documentation.