scope:

This instruction applies to all persons engaged in the maintenance of Telecoms Digital Transmission systems for Network Rail including those provided under the FTN / GSM-R project.

The maintenance requirements for Power Plant and Batteries used to support Transmission systems are detailed in NR/L2/TEL/30081.

The maintenance requirements for Antennae used with Microwave systems are detailed in NR/L2/TEL/30088.

Purpose

This telecoms maintenance instruction defines the maintenance requirements for Telecoms Digital Transmission systems in use on Network Rail infrastructure.

The purpose of maintaining and testing these systems is to decrease the incidence of failures through deterioration and to identify potential failures before they become service affecting.