ERTMS/ETCS RAMS Requirements Specification Chapter 2 - RAM

EEIG ERTMS Users GroupMMAMCMMIMinorMovement AuthorityThe aim of the Management Computer is to handle the non-vitaltrainborne ERTMS functions. To achieve this, the MC mustreceive the necessary train or track data and process themseparately from the safety computations carried out in the EVC.All functions which have to be shown to the driver and all choicesof the driver are indicated on the Man Machine Interface .MTBFMean Time Between FailuresMTBF-I ONB/TRK/LNS Mean Time Between Immobilising FailuresOnboard/Trackside/LinesideMTBF-M ONB/TRK/LNS Mean Time Between Minor Failures Onboard/Trackside/LinesideMTBF-S ONB/TRK/LNS Mean Time Between Service FailuresMTTRMTTRSNdNVFOCOCSIOGAOIRTONBOSIOSMOUIOUSMP dsPMARAM(S)RBCRdRFOnboard/Trackside/LinesideMean Time To RepairMean Time To ReStoreExpected Number of DefectsThe vital functions of the radio block center are located in theNone Vital computer. These functions have not a very high safetyrelevance.Occurrences LevelOnboard Complex System InterfaceOnboard GSM ApparatusOnboard Intermittent RX/TX apparatusOn boardOnboard System InterfaceOnboard Safe ModuleOnboard User InterfaceOnboard Unsafe ModuleProbability of having delay due to ERTMS failuresPreventive Maintenance AnalysisReliability Availability Maintainability (Safety)Radio Block CentreDefects and Failures ReductionThe Recording Function is optional. Its purpose is to record allevents reported over the ERTMS Bus and to record thesetogether with the time and odometer values at the time ofreporting.Doc. Ref.: 02s1266- page 81/83