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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 requirementsalignedwithtechnologybasisfailurerateallocationtoindividualcardsinvolvementofcomponentengineering QA cardfailureratesonbasisofpartslistscomponentratingbydesignnew criticalcomponentsspecificationnewcomponents supplieraudits inproductionfailurecontrolfieldreturnanalysis thresholdmonitoringconservativedatabasedonpredictedvaluesregularcomponentsupplieraudits ReliabilityControlandImprovement Cross functionalteamestablishedtoinstallfocusedprogramCloseinteractionwiththesupplierfordesign technologyandprocessEarlyfailuremonitoringandfeedbackindevelopmentphaseExtendedtestingincludingtemperaturecyclinginproductionDetailedfailuremonitoringinproductionforearlycorrectiveaction PredictedFITratesvs fieldreturnFITrates FieldreturnFITrateinherentlyis lowerthanpredictedFITratesparepartsdon tcontributetoFMAnon installedequipmentatcertaincarrierslowchannelcountformanyyearstemperatureforFITestimationprobablyhigherthaninrealitymargin e g duetolowchannelcount lowPMD BOL canmaskperformancedegradation FunctionalPartitionofOLI OpticalamplificationviaEDFAgainblockPumpdiodesMonitordiodesEDF HeaterInternalGainSwitchOSCsplittingfunctionsasAdd DropoftheOSCchannelusingwavelengthselectivecouplersSplittingofmonitorsignalsattheinputandoutputportandatintermediatemeasurementpointsSpectralshapingofthesignalusingaVOAforsettingtheEDFAtoanoptimizedoperatingpointGTCfortiltcompensationOpticalmonitorportsatinputandoutputforsignalsupervisionAPSDcircuitryGainControlandSupervision DSP on boardprocessor ElectricalcomponentsforcontrolandpowersupplyMechanicsincludingPCB Thebathtubcurve FailurerateslviatimeT TheunitofthefailureratelisaFIT FailureinTime 1FIT 1Failureper109h BathtubCurve IEC61709 Electroniccomponents Reliability Referenceconditionsforfailureratesandstressmodelsforconversion nobasicfailurerates RelationshipbetweenStandardsSIEMENSstandardSN29500 IEC61709comparedtoSR 332 SR 332 ReliabilityPredictionProcedureforElectronicEquipment SN29500 FailureratesofcomponentsExpectedvalues ThisisinadditiontoIEC61709 a ClimaticandmechanicalstressesperIEC721 3 3 seenextslide multiplyingfactorsforenvironmentalconditionsb QualityfactortestedcomponentsSN725004qualitylevelsknownc TemperatureandelectricalstressbyreferenceconditionsIEC61709givenreferenceconditionsandconversion SR 332 IEC61709 Electroniccomponents Reliability Referenceconditionsforfailureratesandstressmodelsforconversion 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 componentsandPCBA softhemodule 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 HistoryandacceptanceDevelopedascompany sinternalstandardFirsteditionin1978WorldwideusedbythemostSiemensgroupsWidelyusedoutsidethecompanyGenerallyusedcalculatingtheSiemenstelecommunicationssystemsApprovedworldwidebythecustomersFullyinaccordancewithEN IEC61709 actuallypartsPart1 GeneralPart2 integratedcircuitsPart3 discretesemiconductorsPart4 passivecomponentsPart5 electricalconnectionsPart6 connectorsandsocketsPart7 relaysPart9 switchesPart10 signalandpilotelampsPart11 contactorsPart12 opticalsemiconductors signalrecei
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