ERTMS/ETCS RAMS Requirements Specification Chapter 2 - RAM

EEIG ERTMS Users Group2.2.1.1 Mission of the ERTMS/ETCSThe ERTMS/ETCS mission has been identified in § 2.1.1.2..2.2.1.1.1 ERTMS/ETCS ScopeThe target system is defined, in the RAM Requirements Specification context, asfollows:• 1 ERTMS/ETCS equipped train plus all the ERTMS/ETCS trackside andlineside equipment encountered during 1 hour of trip in the worst case (at themaximum allowed speed in european railways of 500 km/h considering themost complex possible configuration);It is important to identify in this context the boundary limits of the ERTMS/ETCSequipment, establishing in this way the scope of the RAM Requirements definedin this specification.In § 2.1.1.1. the constituents which compose the ERTMS/ETCS categorised inTrainborne and Trackside equipment are identified.The following functional boundary limits are defined for ERTMS/ETCS [2.17]:1. Traffic regulation does not form part of the system. It forms part of an externalsystem taking into consideration national peculiarities. It is not mandatory for itto be linked with the ERTMS/ETCS system. However, an interface between theregulation system and ERTMS/ETCS must be provided in order to:• communicate to ERTMS/ETCS, and ultimately to the train, driving advisesdrawn up by the regulation intended to optimise the traffic flow;• inform the regulation of the train location known to ERTMS/ETCS for thereal time uptake of its regulation strategies according to environmentalconditions.2. Signal boxes do not form part of the ERTMS/ETCS, but they are interfacedwith that in order to:• communicate to ERTMS/ETCS, the positions of points or routes set or,indeed in the cases of levels 1 and 2, block conditions drawn up by existingexternal systems;Doc. Ref.: 02s1266- page 14/83