Commission Decision of 25 January 2012 on the technical specification for interoperability relating to the control-command and signalling subsystems of the trans-European rail system (notified under document C(2012) 172) (Text with EEA relevance) (2012/88/EU) (repealed)

4.1. Introduction U.K.

In accordance with the relevant essential requirements, the Control-Command and Signalling Subsystems are characterised by the following basic parameters:

1.

Control-Command and Signalling safety characteristics relevant to interoperability (Section 4.2.1)

2.

On-board ERTMS/ETCS functionality (Section 4.2.2)

3.

Track-side ERTMS/ETCS functionality (Section 4.2.3)

4.

Mobile communication functions for railways – GSM-R (Section 4.2.4)

5.

ERTMS/ETCS and GSM-R air gap interfaces (Section 4.2.5)

6.

On-board interfaces Internal to Control-Command and Signalling (Section 4.2.6)

7.

Track-side interfaces Internal to Control-Command and Signalling (Section 4.2.7)

8.

Key management (Section 4.2.8)

9.

ETCS-ID management (Section 4.2.9)

10.

Train detection systems (Section 4.2.10)

11.

Electromagnetic compatibility between rolling stock and Control-Command and Signalling track-side equipment (Section 4.2.11)

12.

ERTMS/ETCS DMI (driver machine interface) (Section 4.2.12)

13.

GSM-R DMI (driver machine interface) (Section 4.2.13)

14.

Interface to data recording for regulatory purposes (Section 4.2.14)

15.

Visibility of track-side Control-Command and Signalling objects (Section 4.2.15)

16.

Environmental conditions (Sections 4.2.16)

All requirements in Section 4.2 (Functional and technical specifications of the Subsystems) to meeting these basic parameters shall be applied to the Class A system.

Requirements for Class B systems and for STMs (which enable the Class A On-board system to operate on Class B infrastructure) are the responsibility of the appropriate Member State.

This TSI is based on the principles of enabling the Control-Command and Signalling Track-side Subsystem to be compatible with TSI compliant Control-Command and Signalling On-board Subsystems. To achieve this goal:

1.

functions, interfaces and performances of the Control-Command and Signalling On-board Subsystem are standardised, ensuring that every train will react in a predictable way to data received from track-side;

2.

for the Control-Command and Signalling Track-side Subsystem, track-to-train and train-to-track communication are fully standardised in this TSI. The specifications referenced in the sections below allow Control-Command and Signalling track-side functionality to be applied in a flexible way, so that it can be optimally integrated into the railway system. This flexibility shall be exploited without limiting the movement of TSI-compliant on-board subsystems.

The Control-Command and Signalling functions are classified in categories indicating whether they are optional (O) or mandatory (M). The categories are defined in Annex A 4.1a for ERTMS/ETCS and Annex A 4.1b for GSM-R and these texts also state how the functions are classified.

Annex A 4.1c provides the Glossary of ERTMS/ETCS terms and definitions, which are used in the specifications referred to in Annex A.

According to Section 2.2 (Scope) the Control-Command and Signalling Subsystems include three parts.

The following table indicates which basic parameters are relevant for each subsystem and for each part.

Subsystem	Part	Basic parameters
Control-Command and Signalling On-board	train protection	4.2.1, 4.2.2, 4.2.5, 4.2.6, 4.2.8, 4.2.9, 4.2.12, 4.2.14, 4.2.16
	radio communication	4.2.4, 4.2.5, 4.2.6, 4.2.13, 4.2.14, 4.2.16
Control-Command and Signalling Track-side	train protection	4.2.3, 4.2.5, 4.2.7, 4.2.8, 4.2.9, 4.2.15, 4.2.16
	radio communication	4.2.4, 4.2.5, 4.2.7, 4.2.16
	train detection	4.2.10, 4.2.11, 4.2.16

With respect to the essential requirements set out in Chapter 3, the functional and technical specifications of the Control-Command and Signalling Subsystems are as follows.