ERTMS/ETCS RAMS Requirements Specification Chapter 2 - RAM

EEIG ERTMS Users Group2.1.1 PRELIMINARY RAM ANALYSISThis preliminary analysis aims at defining the inputs for the Overall ERTMS/ETCS RAMRequirements Specification.Such inputs are composed by the following information:−technical information for the definition of the ERTMS/ETCS mission profileincluding system boundary limits and operating, environmental andmaintenance conditions;− definition of the failure conditions of the system.2.1.1.1 System IdentificationThe architecture of the ERTMS/ETCS, identifying its main subsystems andconstituents in order to provide an input for the activity of defining the boundarylimits of the system and then univocally defining the scope of the RAM RequirementsSpecification, is defined in the ERTMS Users Group document : 96e0148- [2.17]2.1.1.2 Mission of the SystemThe mission of the ERTMS/ETCS is to supervise, at different levels of application,the movement of trains ensuring their safe running on different European railwaynetworks [2.17]2.1.1.3 Operating Conditions: Application LevelsThe ERTMS/ETCS operating conditions depending of the Application Levels aredescribed in the ERTMS Users Group document : 96e0136- [2.17]2.1.1.4 Environmental and Maintenance ConditionsThe ERTMS Environmental Conditions are described in [2.3].Maintenance conditions have to constitute a not negligible subset of theERTMS/ETCS mission profile.In the context of ERTMS/ETCS, the reference maintenance conditions has to beidentified in that common principle to be taken into account by the nationalmaintenance systems for allowing the operational and/or technical interoperabilityaccording to the specific Level of Application.In particular, an adequate availability of spare parts for ERTMS equipped foreigntrains has to be ensured by each national maintenance system for ERTMS equippedlines.Doc. Ref.: 02s1266- page 10/83