1 Scope
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 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 fo...