# COMMISSION DECISION of 29 April 2004 modifying Annex A to Decision 2002/731/EC of 30 May 2002 and establishing the main characteristics of Class A system (ERTMS) of the control-command and signalling subsystem of the trans-European conventional rail system referred to in Directive 2001/16/EC of the European Parliament and of the Council (notified under document number C(2004) 1559) (Text with EEA relevance) (2004/447/EC), Division 1: DESCRIPTION OF THE PARAMETER

Extent: E+W+S+N.I.

The unified control/command and signalling subsystem (ERTMS — European rail traffic management system) comprise two elements:
the control/command and signalling element (ERTMS/ETCS — European rail traffic management system/European train control system) covers both the onboard subsystems and track-side subsystems,
the radio and telecommunication element (ERTMS/GSM-R — GSM for railways) is based on the standards applied to the public GSM network and also covers both track-side and onboard equipment. GSM-R is based on ETSI standard GSM phase 2+, including GPRS (global packet radio services), extended to railway-specific applications.

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Source: https://www.legislation.gov.uk/eudn/2004/447/annex/division/1 (the official version)
Page: https://openlegislation.uk/eu-decision-2004-447/annex/division-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.