Configuration managementmeans a systematic organisational, technical and administrative process put in place throughout the lifecycle of a CCS subsystem to ensure that the consistency of the documentation and the traceability of the changes are established and maintained so that:
failuremeans the termination of the ability of an item to perform a required function with the required performance and ‘failure mode’ means the effect by which the failure is observed.
failure modemeans the effect by which the failure is observed.
operational test scenariomeans a sequence of trackside and on-board events related to or influencing the Control-command and Signalling subsystems (e.g. sending/receiving messages, exceeding a speed limit, actions of operators) and the specified timing between them in order to test the intended railway system operation in situations relevant for ETCS, ATO and RMR (e.g. entry of a train into an equipped area, awakening of a train, overriding a signal at stop).
Representative configurationmeans a configuration on the basis of which test results can be achieved, which are valid for various configurations of the same certified ETCS on-board interoperability constituent or of a certified on-board subsystem.