scope:

This standard applies to LANs supporting Operational Systems used by London Underground.

This standard describes the communications infrastructure necessary to convey station control and monitoring data reliably, it does not prescribe what the data represents.

For the services considered within the Station Asset Communications Network, only layers 1 through to 4 of the OSI model are considered in this standard. These layers support the services necessary for the reliable transfer and routing of data via a network, however the specification, content or use of the data is not defined in this standard.

The Station Asset Communications Network shall link station assets to provide control, performance and condition monitoring using a network based on open standards. The network provides the underlying services necessary for the reliable transport of information, but does not prescribe the specific data, codes or both that would be conveyed.

The following is a list of some examples of assets considered for connection:

lifts;

escalators;

public address components;

pumps;

help-points;

UTS gates;

power monitoring equipment;

access control;

CCTV control.

Purpose

The purpose of this standard is to define the requirements for Local Area Networks (LANs) suitable for Supervisory Control and Data Acquisition (SCADA) system for the control of assets within the locale of a station.