Division 2.1 General

The Control-Command Subsystem is defined as that set of functions and their implementation, which allow the safe movement of trains.

The TSI Control-Command defines the essential requirements for those parts of the Control-Command Subsystem that have relevance to interoperability, and therefore are subject to EC declaration of verification.

The features of the Control-Command Subsystem that are related to the interoperability of the trans-European high-speed rail system are determined by:

1. 1..

   The FUNCTIONS that are essential for the safe control of the railway traffic, and that are essential for the operation, including those required under degraded modes^f1.

2. 2..

   The INTERFACES.

3. 3..

   The level of PERFORMANCE required to meet the essential requirements.

The specification of these functions, interfaces and performance requirements are provided in Chapter 4 (Characterisation of the Subsystem) where supporting standards are referenced.