scope:

This Network Rail standard sets out the parameters to promote consistent optical fibre cabling infrastructure throughout Network Rail's optical fibre network and specifies permissible optical loss and configuration of the network that will extend and preserve the networks reliability, availability and maintainability.

The design principles and parameters set out in this standard apply to all designs that grow, change, or repair Network Rail's optical fibre infrastructure, including optical fibre infrastructure supporting Signalling circuits and Electrical Plant applications but excluding intra-building optical fibre infrastructure with no operational traffic.

Purpose

The purpose of this standard is to set out the principles and considerations to be taken into account for additions to, or modifications of, Network Rail's optical fibre infrastructure with the objectives of maximise its potential capacity and applying a consistent approach that will perpetuate reliability, availability and maintainability