scope:

This instruction applies to all persons engaged in the maintenance and testing of lineside telephone plug points and TEC systems. The maintenance of the Signal Post Telephones on the Northern City Line is defined within this instruction.

Purpose

This telecoms maintenance instruction defines the maintenance and functional testing that Network Rail requires for their lineside telephone Plug Points and Tunnel Emergency Communications systems (excludes Severn Tunnel installations).

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