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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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