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M.Chbat,S.Eberlin,M.Tochtermann,T.Juhnke,hiT7500Multi-HaulDWDMsystemProductReliabilityUpdateProcesses,Status,andMeasures,Sept15,2004,SiemensReliabilityProcessOverview,CardFITRate,FeedbackfromFieldReturnRate,ProductReliabilityAssuranceProcess,Reference:Siemensstandard;inagreementwithinternationalstandardsIEC61709,productdefinition,productdevelopment,productdelivered,requirementsalignedwithtechnologybasisfailurerateallocationtoindividualcardsinvolvementofcomponentengineering1FIT=1Failureper109h)!,BathtubCurve,IEC61709:ElectroniccomponentsReliabilityReferenceconditionsforfailureratesandstressmodelsforconversion(nobasicfailurerates),RelationshipbetweenStandardsSIEMENSstandardSN29500/IEC61709comparedtoSR-332,SR-332:ReliabilityPredictionProcedureforElectronicEquipment,SN29500:FailureratesofcomponentsExpectedvalues(ThisisinadditiontoIEC61709),a)ClimaticandmechanicalstressesperIEC721-3-3(seenextslide)multiplyingfactorsforenvironmentalconditionsb)QualityfactortestedcomponentsSN725004qualitylevelsknownc)TemperatureandelectricalstressbyreferenceconditionsIEC61709givenreferenceconditionsandconversion(SR-332),IEC61709:ElectroniccomponentsReliabilityReferenceconditionsforfailureratesandstressmodelsforconversion,Thedefinitions,referenceconditionsandconversionmodelsusedintheIEC61709fullycorrespondwiththealreadyexistingSIEMENSstandardSN29500method.,Details:SIEMENSStandardSN29500andIEC61709,FITRatesofIndividualElectricalComponents(1),VoltagedependenceandCurrentdependence,UOperatingvoltageinVUrefReferencevoltageinVUmaxRatedvoltageinVC1Constantin(1/V)C2C2,C3Constants(1).DigitalCMOSFamilies,Contactors(2).Others,IOperatingcurrentinAIrefReferencecurrentinAImaxRatedcurrentinAC4,C5Constants,FITRatesofIndividualElectricalComponents(2),AConstantEa1,Ea2ActivationenergiesineVTU,refReferenceambienttemperatureinKT1Referencejunction*)-(comp.*)-)temperatureinKT2Actualjunction*)-(comp.*)-)temperatureinK*)Dependsontypeofcomponent,seealsoSN29500,Part1,Capt.4.3,Temperaturedependence,TheexpectedfailurerateofaHW-unitcanbecalculatedbyaddingtheexpectedfailureratesofthecomponents:,Details:TotalReliabilityandTotalFailureRateofUnit,SiemensReliabilityProcessOverview,CardFITRate,FeedbackfromFieldReturnRate,EstimationofFITRatesforOpticalComponents,Inparalleltothequalificationcross-checkdetaileddiscussionstakeplacewiththevendorWhatistheestimateofthevendor?Howdidhereachhisestimate?WhatistheFITrateofsub-componentsandPCBAsofthemodule?Resultsofthecross-qualificationaretakenintoaccount(failures,correctiveactions,changes)TheestimationofthevendorandtheexpertiseofqualificationteamleadtotheSiemensestimate(notnecessarilythesameasthevendorsestimate)FieldreturnsaretakenintoaccountwhenavailableandcomparedtotheestimateFITratesareadaptedaccordingly(repetitiveprocess),ExampleofFITRateAdaption:EDFAw/5pumps,Firstestimatein2001:6000FIT(completenewdesignincl.newPumps,noexperienceatSIEMENSside)Newvendors(newspec.)werequalifiedbyCoCOpticsandtheCoCprocesstookplaceEstimatesbytwovendors:3500-4800FITReductionto5000FITbeginningof2004QualityimprovementdiscussionswiththevendorsongoingCheckwithfieldreturns:1600FITReductionto4000FIT(Siemensestimate)inAprilof2004ContinuouslymonitoredSimilarprocesswithEDFAs(2pumps)leadtoanestimateof2400FIT,ExampleofFITRateCalculationforanOpticalAmplifierProvidedbytheEDFASupplier(1),ExampleofFITRateCalculationforanOpticalAmplifierProvidedbytheEDFASupplier(2),OverallFITrate:3457.7,SiemensReliabilityProcessOverview,CardFITRate,FeedbackfromFieldReturnRate,ReferenceFITRateforelectricalandmechanicalcomponents,SN29500developedbyZTSRCorporateFunctionStandardizationandRegulation,Cross-functionalexpertteamSN29500,CommitteeQualityUsedbyallSiemensdivisionsUpdatedbyexpertteamwithdatafrom:fieldexperience,componentqualifyingteamsandcomponentmanufacturers,HistoryandacceptanceDevelopedascompanysinternalstandardFirsteditionin1978WorldwideusedbythemostSiemensgroupsWidelyusedoutsidethecompanyGenerallyusedcalculatingtheSiemenstelecommunicationssystemsApprovedworldwidebythecustomersFullyinaccordancewithEN/IEC61709,actuallypartsPart1:GeneralPart2:integratedcircuitsPart3:discretesemiconductorsPart4:passivecomponentsPart5:electricalconnectionsPart6:connectorsandsocketsPart7:relaysPart9:switchesPart10:signalandpilotelampsPart11:contactorsPart12:opticalsemiconductors,signalreceiversPart13:light-emittingandinfrareddiodesPart14:optocoupler,FITRatesofIndividualElectricalComponents,ReliabilityofBasicBooster(OLISTBNC):ContributionofComponentGroup,ReliabilityofStandardBooster(OLITBNC):ContributionofComponentGroup,SiemensReliabilityProcessOverview,CardFITRate,FeedbackfromFieldReturnRate,FITRatesofIndividualMechanicalComponents,SiemensReliabilityProcessOverview,CardFITRate,Feedbackf