ERTMS/ETCS RAMS Requirements Specification Chapter 2 - RAM

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EEIG ERTMS Users GroupVERSIONS & MODIFICATIONSVersionNb1-Date ofdistribution15/05/1996Comments on the modificationFirst issueResponsible forthe modificationM. B.2-30/05/1996Preliminary Overall RAMS RequirementsM. B.3-28/06/1996+ Preliminary ApportionmentM. B.4-19/09/1996Modified version: accepted comments, compliance withavailable ERTMS SpecificationsM. B.5-20/12/1996Final version: agreed by national railways, integratingthe RAMS Workshop with Eurosig agreed resultsM. B.6-30/09/98Including the agreed modifications in the databaseM. B.APPROVALThis document is approved by :Title Name SignatureRAMS ManagerM. BERIEAUSystem DirectorF. HEIJNENThis document is controlled by :Title Name SignatureQuality DirectorA. JANHSENThis document is authorised for distribution by :Title Name SignatureManaging DirectorJ. PELLEGRINDoc. Ref.: 02s1266- page 2/83
EEIG ERTMS Users GroupTABLE OF CONTENTSChapter 22.0. REFERENCES......................................................................................................................................52.1. ERTMS PRELIMINARY RAM RELATED ANALYSES ..........................................................................82.1.1 PRELIMINARY RAM ANALYSIS....................................................................................................102.1.1.1 System Identification................................................................................................................102.1.1.2 Mission of the System..............................................................................................................102.1.1.3 Operating Conditions: Application Levels..................................................................................102.1.1.4 Environmental and Maintenance Conditions.............................................................................102.1.1.5 Failure Conditions ....................................................................................................................112.1.2 RAM V&V: OVERVIEW OF THE RAM PROGRAM........................................................................112.2. ERTMS OVERALL RAM REQUIREMENTS........................................................................................132.2.1 MISSION PROFILE OF THE ERTMS SYSTEM.............................................................................132.2.1.1 Mission of the ERTMS/ETCS...................................................................................................142.2.1.2 Environmental Conditions.........................................................................................................152.2.1.3 Maintenance Conditions...........................................................................................................152.2.1.4 Operating Conditions ...............................................................................................................172.2.2 SYSTEM RAM REQUIREMENTS ..................................................................................................202.2.2.1 ERTMS Availability Targets......................................................................................................212.2.2.2 ERTMS Mission Reliability Targets ..........................................................................................232.2.2.3 ERTMS Maintainability Targets ................................................................................................262.2.2.4 ERTMS Logistic Support Constraints .......................................................................................292.2.3 RAM VERIFICATION AND VALIDATION.......................................................................................312.2.3.1 Acceptance Criteria..................................................................................................................322.2.3.2 V&V Program...........................................................................................................................382.3. APPORTIONMENT OF RAM TARGETS ............................................................................................402.3.1 ERTMS FUNCTIONAL ANALYSIS.................................................................................................402.3.2 CONTRIBUTIONS TO THE ERTMS/ETCS OPERATIONAL AVAILABILITY..................................402.3.2.1 Hardware Contribution .............................................................................................................402.3.2.2 Transmission Errors Contribution .............................................................................................422.3.3 ERTMS (UN)AVAILABILITY REQUIREMENTS FOR CONSTITUENTS.........................................442.3.4 ERTMS FUNCTIONS RAM-BASED ALLOCATION OF SOFTWARE INTEGRITY LEVELS...........452.3.4.1 RAM-based IL determination....................................................................................................462.3.4.2 ERTMS Functions Weakness Estimation Requirements...........................................................472.3.5 REQUIREMENTS FOR THE ERTMS SOFTWARE INTEGRITY LEVELS APPORTIONMENT......472.4. SYSTEM RAM PROGRAMME PLAN REQUIREMENTS ....................................................................492.4.1 GENERAL......................................................................................................................................492.4.1.1 Purpose ...................................................................................................................................492.4.1.2 Scope ......................................................................................................................................492.4.1.3 RAM Structure and Responsibilities .........................................................................................502.4.1.4 RAM Requirements..................................................................................................................502.4.1.5 RAM Programme Plan .............................................................................................................512.4.1.6 System Conditions and Mission Profile.....................................................................................512.4.1.7 System Analysis ......................................................................................................................522.4.2 RELIABILITY PROGRAMME SPECIFICITIES ...............................................................................522.4.2.1 Reliability Programme Reviews................................................................................................522.4.2.2 Reliability Modelling, Prediction and Apportionment..................................................................532.4.2.3 FMECA analysis ......................................................................................................................542.4.2.4 Critical Items List......................................................................................................................542.4.2.5 Software Reliability Estimation .................................................................................................552.4.2.6 Reliability Preliminary Tests .....................................................................................................552.4.2.7 Reliability Demonstration Testing Plan .....................................................................................562.4.2.8 Reliability Demonstration Tests ................................................................................................572.4.2.9 Failure data collection from the field (FRACAS)........................................................................57Doc. Ref.: 02s1266- page 3/83
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ERTMS/ETCS RAMS Requirements Specification Chapter 2 - RAM

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