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1、9,825,461,087,6410,916,000,008,00M.Chbat,S.Eberlin,M.Tochtermann,T.JuhnkehiT7500Multi-HaulDWDMsystemProductReliabilityUpdateProcesses,Status,andMeasuresSept15,2004Information and Communication Networks9,825,461,087,6410,916,000,008,00SiemensReliabilityProcessOverviewOpticalComponents:EDFAVOAGTCPassi
2、vesNegotiationswithsuppliers:ModelingFieldexperienceSuppliercomparisonElectricalComponents:ResistorsCapacitorsTransistorsICsetc.Standards:SN29500IEC61709MechanicalComponents:ConnectorsBoardsetc.Standards:SN29500IEC61709CardFITRateFeedbackfromFieldReturnRateInformation and Communication Networks9,825
3、,461,087,6410,916,000,008,00ProductReliabilityAssuranceProcessReference : Siemens standard; in agreement with international standards IEC 61709product definitionproduct developmentproduct deliveredrequirements aligned with technology basis failure rate allocation to individual cards involvement of c
4、omponent engineering & QAcard failure rates on basis of parts listscomponent rating by designnew & critical components specificationnew components & supplier auditsin production failure controlfield return analysis & threshold monitoringconservative data based on predicted valuesregular component su
5、pplier auditsInformation and Communication Networks9,825,461,087,6410,916,000,008,00Information and Communication Networks9,825,461,087,6410,916,000,008,00PredictedFITratesvs.fieldreturnFITratesField return FIT rate inherently is (!) lower than predicted FIT rate nspare parts dont contribute to FMAn
6、non-installed equipment at certain carriersnlow channel count for many yearsntemperature for FIT estimation probably higher than in realitynmargin (e.g., due to low channel count, low PMD, BOL) can mask performance degradationInformation and Communication Networks9,825,461,087,6410,916,000,008,00Fun
7、ctionalPartitionofOLIOptical amplification via EDFA gain blocknPump diodesnMonitor diodesnEDF-HeaternInternal Gain SwitchOSC splitting functions asnAdd / Drop of the OSC channel using wavelength selective couplersnSplitting of monitor signals at the input and output port and at intermediate measurem
8、ent pointsSpectral shaping of the signal using anVOA for setting the EDFA to an optimized operating pointnGTC for tilt compensationOptical monitor ports at input and output for signal supervisionAPSD circuitryGain Control and Supervision (DSP, on-board processor)Electrical components for control and
9、 power supplyMechanics including PCBInformation and Communication Networks9,825,461,087,6410,916,000,008,00012345678910111213OperatingtimeTinyearsFailureratel Early failuresltotalWear-out failureThebathtubcurve:FailurerateslviatimeTRandomfailureForthefieldreplaceableHW-unitsandtheircomponentsthefail
10、ureratel couldbeonlypredictedbyrandomfailures!TheunitofthefailureratelisaFIT(Failure in Time; 1FIT=1Failureper109h)!BathtubCurveInformation and Communication Networks9,825,461,087,6410,916,000,008,00IEC61709:ElectroniccomponentsReliabilityReferenceconditionsforfailureratesandstressmodelsforconversio
11、n(no basic failure rates)RelationshipbetweenStandardsSIEMENSstandardSN29500/IEC61709comparedtoSR-332SR-332:ReliabilityPredictionProcedureforElectronicEquipmentSN29500:FailureratesofcomponentsExpectedvalues(This is in addition to IEC 61709)a)Climaticandmechanicalstressesper IEC 721-3-3 (see next slid
12、e)multiplying factors for environmentalconditionsb)Qualityfactortested components SN725004 quality levels knownc)Temperatureandelectricalstressby reference conditions IEC 61709given reference conditions and conversion (SR-332)Information and Communication Networks9,825,461,087,6410,916,000,008,00IEC
13、61709:ElectroniccomponentsReliabilityReferenceconditionsforfailureratesandstressmodelsforconversionThefailurerateunderoperatingconditionsiscalculatedasfollows:Wherelrefis the failure rate under reference conditions;pUis the voltage dependence factor;pIis the current dependence factor;pTis the temper
14、ature dependence factor.These Parameter are listed e.g in the SN29000 library!ReferenceconditionsforclimaticandmechanicalstressesTypeofstressReferencecondition1)qamb,ref=40CClimaticconditionsClass3K3asperIEC721-3-3MechanicalstressClass3M3asperIEC721-3-3Specialstresses3)NoneFor details of notes (-1,
15、-2,-3) please refer to IEC 61709Ambienttemperature2)Thedefinitions,referenceconditionsandconversionmodelsusedintheIEC61709fullycorrespondwiththealreadyexistingSIEMENSstandardSN29500method.Details:SIEMENSStandardSN29500andIEC61709Information and Communication Networks9,825,461,087,6410,916,000,008,00
16、FITRatesofIndividualElectricalComponents(1)VoltagedependenceandCurrentdependenceoror(1)(2)UOperating voltage in VUrefReference voltage in VUmaxRated voltage in VC1Constant in (1/V)C2C2,C3Constants(1).Digital CMOS Families, Contactors (2).OthersIOperating current in AIrefReference current in AImaxRated current in AC4,C5ConstantsInformation and Communication Networks9,825,461,087,6410,916,000,008,00FITRatesofIndividualElectricalComponents(2)AConstantEa1,Ea2Activation energies in eVTU,refReference
