ERTMS/ETCS RAMS Requirements Specification Chapter 2 - RAM

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EEIG ERTMS Users GroupThe ERTMS/ETCS RAM Programme shall include, as a minimum, the followingactivities:• RAM Programme Planning;• System conditions and mission profile;• Periodical RAM Programme reviews;• Reliability modelling, prediction and apportionment;• FMECA analysis;• Software reliability analysis;• Service dependability analysis and verification;• Preventive maintenance analysis;• Corrective maintenance analysis;• Fault isolation and trouble-shooting plans;• Reliability development/growth testing programme;• Maintainability preliminary tests;• Reliability demonstration tests;• Maintainability demonstration tests;• Failure data collection from the field (FRACAS).The above list defines the minimum requirements for a RAM Programme for a systemincluding hardware and software. A RAM Programme Specification will be tailored tothe particular application and the relevant activities will be detailed in theERTMS/ETCS RAM Requirements Specification.Doc. Ref.: 02s1266- page 12/83
EEIG ERTMS Users Group2.2. ERTMS OVERALL RAM REQUIREMENTSThis chapter aims to define the contents of the ERTMS RAMS Requirements Specificationwhich state the Overall RAM Requirements for the ERTMS/ETCS system.The Overall RAM Requirements are defined in accordance with CENELEC EN50126 onthe basis of the principles established in [2.18] and of the currently availableERTMS/ETCS controlled, where applicable, documentation.For better addressing system requirements along the text of the document, they areidentified by placing the symbol ® at the left margin of the first line of the relevantparagraph. For more information about the use of the requirements marked with ®, referto §2.3.3.As stated in the CENELEC EN50126, the ERTMS/ETCS Overall RAM RequirementsSpecification is organised in the following four sections:• Mission Profile identification• Overall RAM Requirements definition• Overall RAM Verification and Validation criteria• Overall RAM Programme requirementsThe specified Overall RAM Requirements, including Mission Profile, RAM Requirements,V&V criteria and RAM Programme requirements, will constitute the baseline forapportioning RAM Requirements to the ERTMS/ETCS subsystems and for defining theERTMS Subsystem RAM Requirements Specification.2.2.1 MISSION PROFILE OF THE ERTMS SYSTEMThe ERTMS/ETCS mission profile defines the conditions under which the system isrequired to accomplish its mission. Those conditions constitute the reference conditionsfor:1. defining the ERTMS/ETCS system RAM requirements up to the SystemRequirements Apportionment phase of the system Lifecycle;2. demonstrating, by analysis and tests, that each specific implementation fulfilsthe above requirements in all the Lifecycle phases starting from the Design andImplementation phase.Doc. Ref.: 02s1266- page 13/83
Page 1 and 2: Reference EEIG : 96S126Chapter Ref
Page 3 and 4: EEIG ERTMS Users GroupTABLE OF CONT
Page 5 and 6: EEIG ERTMS Users Group2.0. REFERENC
Page 7 and 8: EEIG ERTMS Users Group[2.15]MIL-HDB
Page 9 and 10: EEIG ERTMS Users Groupand to draw u
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Page 15 and 16: EEIG ERTMS Users Group• transmit
Page 17 and 18: EEIG ERTMS Users GroupAuthority res
Page 19 and 20: EEIG ERTMS Users Group• the ERTMS
Page 21 and 22: EEIG ERTMS Users GroupThe quantifia
Page 23 and 24: EEIG ERTMS Users Group2.2.2.2 ERTMS
Page 25 and 26: EEIG ERTMS Users GroupThe relevant
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Page 29 and 30: EEIG ERTMS Users Groupto be fulfill
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Page 33 and 34: EEIG ERTMS Users GroupThe measures
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Page 39 and 40: EEIG ERTMS Users GroupThe Software
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Page 43 and 44: EEIG ERTMS Users Group2.3.2.2.1 Con
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Page 53 and 54: EEIG ERTMS Users Groupand control t
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EEIG ERTMS Users GroupThe forms for
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EEIG ERTMS Users Group5. Final cont
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EEIG ERTMS Users GroupMandatory Ref
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EEIG ERTMS Users GroupCENELEC SC9XA
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EEIG ERTMS Users GroupConditions, O
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EEIG ERTMS Users GroupLifecycle, Sy
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EEIG ERTMS Users Groupjust mission-
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EEIG ERTMS Users Groupand to the na
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EEIG ERTMS Users GroupAcronyms and
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EEIG ERTMS Users GroupMMAMCMMIMinor
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ERTMS/ETCS RAMS Requirements Specification Chapter 2 - RAM

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