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6,000,008,00M.Chbat,S.Eberlin,M.Tochtermann,T.JuhnkehiT7500Multi-HaulDWDMsystemProductReliabilityUpdateProcesses,Status,andMeasuresSept15,2004InformationandCommunicationNetworks6,000,008,00SiemensReliabilityProcessOverviewOpticalComponents:•EDFA•VOA•GTC•PassivesNegotiationswithsuppliers:•Modeling•Fieldexperience•SuppliercomparisonElectricalComponents:•Resistors•Capacitors•Transistors•ICs•etc.Standards:•SN29500•IEC61709MechanicalComponents:•Connectors•Boards•etc.Standards:•SN29500•IEC61709CardFITRateFeedbackfromFieldReturnRateInformationandCommunicationNetworks6,000,008,00ProductReliabilityAssuranceProcessReference:Siemensstandard;inagreementwithinternationalstandardsIEC61709productdefinitionproductdevelopmentproductdeliveredrequirementsalignedwithtechnologybasisfailurerateallocationtoindividualcardsinvolvementofcomponentengineering&QAcardfailureratesonbasisofpartslistscomponentratingbydesignnew&criticalcomponentsspecificationnewcomponents&supplierauditsinproductionfailurecontrolfieldreturnanalysis&thresholdmonitoringconservativedatabasedonpredictedvaluesregularcomponentsupplierauditsInformationandCommunicationNetworks6,000,008,00ReliabilityControlandImprovementCross-functionalteamestablishedtoinstallfocusedprogramCloseinteractionwiththesupplierfordesign,technologyandprocessEarlyfailuremonitoringandfeedbackindevelopmentphaseExtendedtestingincludingtemperaturecyclinginproductionDetailedfailuremonitoringinproductionforearlycorrectiveactionInformationandCommunicationNetworks6,000,008,00PredictedFITratesvs.fieldreturnFITratesFieldreturnFITrateinherentlyis(!)lowerthanpredictedFITratesparepartsdon’tcontributetoFMAnon-installedequipmentatcertaincarrierslowchannelcountformanyyearstemperatureforFITestimationprobablyhigherthaninrealitymargin(e.g.,duetolowchannelcount,lowPMD,BOL)canmaskperformancedegradationInformationandCommunicationNetworks6,000,008,00FunctionalPartitionofOLIOpticalamplificationviaEDFAgainblockPumpdiodesMonitordiodesEDF-HeaterInternalGainSwitchOSCsplittingfunctionsasAdd/DropoftheOSCchannelusingwavelengthselectivecouplersSplittingofmonitorsignalsattheinputandoutputportandatintermediatemeasurementpointsSpectralshapingofthesignalusingaVOAforsettingtheEDFAtoanoptimizedoperatingpointGTCfortiltcompensationOpticalmonitorportsatinputandoutputforsignalsupervisionAPSDcircuitryGainControlandSupervision(DSP,on-boardprocessor)ElectricalcomponentsforcontrolandpowersupplyMechanicsincludingPCBInformationandCommunicationNetworks6,000,008,00012345678910111213OperatingtimeTinyearsFailurerateEarlyfailurestotalWear-outfailureThebathtubcurve:FailureratesviatimeTRandomfailureForthefieldreplaceableHW-unitsandtheircomponentsthefailureratecouldbeonlypredictedbyrandomfailures!TheunitofthefailurerateisaFIT(FailureinTime;1FIT=1Failureper109h)!BathtubCurveInformationandCommunicationNetworks6,000,008,00IEC61709:Electroniccomponents–Reliability–Referenceconditionsforfailureratesandstressmodelsforconversion(nobasicfailurerates)RelationshipbetweenStandardsSIEMENSstandardSN29500/IEC61709comparedtoSR-332SR-332:ReliabilityPredictionProcedureforElectronicEquipmentSN29500:FailureratesofcomponentsExpectedvalues(ThisisinadditiontoIEC61709)a)ClimaticandmechanicalstressesperIEC721-3-3(seenextslide)multiplyingfactor...