ERTMS/ETCS RAMS Requirements Specification Chapter 2 - RAM

EEIG ERTMS Users Groupboth defined at § 2.2.2.3.3. and resulting from the Corrective MaintenanceAnalysis, are fulfilled;® all the ERTMS/ETCS equipment have been operated in the specifiedconditions (as defined in § 2.2.1.1., § 2.2.1.2., § 2.2.1.3. and § 2.2.1.4.2.) forthe specified testing time.If the Maintainability Demonstration Tests are unsuccessful, the Validation Teamwill identify the responsibility of the non-conformity and will require appropriatecorrective actions.In case the responsibility is recognised in the system operator activity, forinstance due to not sufficient skills of the maintenance personnel, any interventionof the Contractor is required and the relevant corrective actions shall beresponsibility of the system operator.Otherwise, the Contractor responsible for the system provisioning shall require tothe appropriate Sub-Contractor(s)/Supplier(s) and, if necessary, shall perform,appropriate modifications able to improve the System Maintainability forcomplying with the specified targets.The measures to be adopted for performing the above modifications shall beproposed by the Contractor responsible and agreed by the Customer ProjectManagement.2.2.3.1.3 Software Acceptance CriteriaThe quantitative contribution of Software Reliability to the ERTMS/ETCS RAM,and Safety, performance is taken into account during one or more of the followingactivities of the RAM, and Safety, Programme:− reliability and maintainability demonstration tests;− operational availability assessment;− system safety demonstration.In none of the above cases the quantitative measure of the Software Reliabilityshall constitute a direct constraint for the software acceptance.The quantitative estimation, or measure, of the Software Reliability shall onlyaffect the whole system acceptance, as it impacts the system operationalavailability and safety.Doc. Ref.: 02s1266- page 34/83