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Fibre-optic communication subsystem test procedures - Installed cable plant. Single-mode attenuation and optical return loss measurement Ingestion-build-276583 Why should you use BS1 Scope This part of IEC 61280 is applicable to the measurement of attenuation and optical return loss of installed optical fibre cable plant using single mode fibre. This cable plant can include single mode optical fibres, connectors, adapters, splices and other passive devices. The cabling may be installed in a variety of environments including residential, commercial, industrial and data centre premises, as well as outside plant environments. This