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1、M Chbat S Eberlin M Tochtermann T Juhnke hiT7500Multi HaulDWDMsystemProductReliabilityUpdateProcesses Status andMeasures Sept15 2004 SiemensReliabilityProcessOverview CardFITRate FeedbackfromFieldReturnRate ProductReliabilityAssuranceProcess Reference Siemensstandard inagreementwithinternationalstan
2、dardsIEC61709 productdefinition productdevelopment productdelivered requirementsalignedwithtechnologybasisfailurerateallocationtoindividualcardsinvolvementofcomponentengineering QA cardfailureratesonbasisofpartslistscomponentratingbydesignnew criticalcomponentsspecificationnewcomponents supplieraudi
3、ts inproductionfailurecontrolfieldreturnanalysis thresholdmonitoringconservativedatabasedonpredictedvaluesregularcomponentsupplieraudits ReliabilityControlandImprovement Cross functionalteamestablishedtoinstallfocusedprogramCloseinteractionwiththesupplierfordesign technologyandprocessEarlyfailuremon
4、itoringandfeedbackindevelopmentphaseExtendedtestingincludingtemperaturecyclinginproductionDetailedfailuremonitoringinproductionforearlycorrectiveaction PredictedFITratesvs fieldreturnFITrates FieldreturnFITrateinherentlyis lowerthanpredictedFITratesparepartsdon tcontributetoFMAnon installedequipment
5、atcertaincarrierslowchannelcountformanyyearstemperatureforFITestimationprobablyhigherthaninrealitymargin e g duetolowchannelcount lowPMD BOL canmaskperformancedegradation FunctionalPartitionofOLI OpticalamplificationviaEDFAgainblockPumpdiodesMonitordiodesEDF HeaterInternalGainSwitchOSCsplittingfunct
6、ionsasAdd DropoftheOSCchannelusingwavelengthselectivecouplersSplittingofmonitorsignalsattheinputandoutputportandatintermediatemeasurementpointsSpectralshapingofthesignalusingaVOAforsettingtheEDFAtoanoptimizedoperatingpointGTCfortiltcompensationOpticalmonitorportsatinputandoutputforsignalsupervisionA
7、PSDcircuitryGainControlandSupervision DSP on boardprocessor ElectricalcomponentsforcontrolandpowersupplyMechanicsincludingPCB Thebathtubcurve FailurerateslviatimeT TheunitofthefailureratelisaFIT FailureinTime 1FIT 1Failureper109h BathtubCurve IEC61709 Electroniccomponents Reliability Referencecondit
8、ionsforfailureratesandstressmodelsforconversion nobasicfailurerates RelationshipbetweenStandardsSIEMENSstandardSN29500 IEC61709comparedtoSR 332 SR 332 ReliabilityPredictionProcedureforElectronicEquipment SN29500 FailureratesofcomponentsExpectedvalues ThisisinadditiontoIEC61709 a Climaticandmechanica
9、lstressesperIEC721 3 3 seenextslide multiplyingfactorsforenvironmentalconditionsb QualityfactortestedcomponentsSN725004qualitylevelsknownc TemperatureandelectricalstressbyreferenceconditionsIEC61709givenreferenceconditionsandconversion SR 332 IEC61709 Electroniccomponents Reliability Referencecondit
10、ionsforfailureratesandstressmodelsforconversion Thedefinitions referenceconditionsandconversionmodelsusedintheIEC61709fullycorrespondwiththealreadyexistingSIEMENSstandardSN29500method Details SIEMENSStandardSN29500andIEC61709 FITRatesofIndividualElectricalComponents 1 VoltagedependenceandCurrentdepe
11、ndence UOperatingvoltageinVUrefReferencevoltageinVUmaxRatedvoltageinVC1Constantin 1 V C2C2 C3Constants 1 DigitalCMOSFamilies Contactors 2 Others IOperatingcurrentinAIrefReferencecurrentinAImaxRatedcurrentinAC4 C5Constants FITRatesofIndividualElectricalComponents 2 AConstantEa1 Ea2Activationenergiesi
12、neVTU refReferenceambienttemperatureinKT1Referencejunction comp temperatureinKT2Actualjunction comp temperatureinK Dependsontypeofcomponent seealsoSN29500 Part1 Capt 4 3 Temperaturedependence TheexpectedfailurerateofaHW unitcanbecalculatedbyaddingtheexpectedfailureratesofthecomponents Details TotalR
13、eliabilityandTotalFailureRateofUnit SiemensReliabilityProcessOverview CardFITRate FeedbackfromFieldReturnRate EstimationofFITRatesforOpticalComponents Inparalleltothequalificationcross checkdetaileddiscussionstakeplacewiththevendorWhatistheestimateofthevendor Howdidhereachhisestimate WhatistheFITrat
14、eofsub componentsandPCBA softhemodule Resultsofthecross qualificationaretakenintoaccount failures correctiveactions changes TheestimationofthevendorandtheexpertiseofqualificationteamleadtotheSiemensestimate notnecessarilythesameasthevendorsestimate Fieldreturnsaretakenintoaccountwhenavailableandcomp
15、aredtotheestimateFITratesareadaptedaccordingly repetitiveprocess ExampleofFITRateAdaption EDFAw 5pumps Firstestimatein2001 6000FIT completenewdesignincl newPumps noexperienceatSIEMENSside Newvendors newspec werequalifiedbyCoCOpticsandtheCoCprocesstookplaceEstimatesbytwovendors 3500 4800FITReductiont
16、o5000FITbeginningof2004QualityimprovementdiscussionswiththevendorsongoingCheckwithfieldreturns 1600FITReductionto4000FIT Siemensestimate inAprilof2004ContinuouslymonitoredSimilarprocesswithEDFAs 2pumps leadtoanestimateof2400FIT ExampleofFITRateCalculationforanOpticalAmplifierProvidedbytheEDFASupplier 1 ExampleofFITRateCalculationforanOpticalAmplifierProvidedbytheEDFASupplier 2 OverallFITrate 3457 7 SiemensReliabilityProcessOverview CardFITRate FeedbackfromFieldReturnRate ReferenceFITRateforelect
