NR - RT/E/S/30002 ISSUE 2
Signal Post Telephone Concentrator System
|Publication Date:||1 August 2001|
This Specification states the technical and user requirements for a telephone unit which terminates several telephone circuits, of different types, on one or more Signaller's operating positions either locally or remotely.
This specification defines the functional requirements for SPT concentrator systems for use in Railtrack Signalling Centres.