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ITU-T L.302/L.40 (10/2000)

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Optical fibre outside plant maintenance support, monitoring and testing system
Outdoor optical fibre maintenance is important to create networks and to maintain their reliability. As traffic increases, higher capacity fibre cables are installed. Recently, optical fibre cables with over 100 cores have become common, so many transmission systems use the same optical fibre cable. Minimal levels of maintenance and testing are required to provide high reliability and quick response.After a cable is installed, functions like fibre monitoring and control have to be done without interfering with the data transmission signals. By monitoring dark fibres (that is, without signal traffic) an indication is given of the performance of the in-service fibres as the degradation and breaks that a cable undergoes affects all fibres in the same way. Nevertheless greater reliability is achieved by monitoring the fibres with traffic. Also fibre identification is important to control fibre networks because several fibres may have to be chosen from within a cable, even if the cable has many fibres in-service.
Approval date: 2000-10-06
Approval process:WTSA
Status: In force
Observation:Former ITU-T L.40 renumbered as ITU-T L.302 on 2016-02-15 without further modification and without being republished.
Maintenance responsibility: ITU-T Study Group 15
Further details: Patent statement(s)
Ed. ITU-T Recommendation Status Summary Table of Contents Download
1 L.302/L.40 (10/2000) In force