TR 62721 @ IEC:2012(E) definitions of terms, symbols and abbreviations for reliability precautions for the approach to check the reliability of newly developed optical components 4.3.3 IEc 62005-2,Reliability of fibre optic interconnectingdevices and passive components - Part 2:Quantitativeassessment of reliability based on accelerated ageing test-Temperature and humidity; steadystate This international standard contains the guidelines for an accelerated test, and examples of anacceleratedtestoftemperatureandhumidityforapassiveopticalcomponenttoestimate the lifetime. It refers to the lognormal and Weibull distributions as a typical failure distribution. It gives an example where temperature acceleration complies with the Arrhenius law and the humidity is proportional to the square of the relative humidity acceleration. It is suggested that O,4 to 1,2 ev is the typical value of activation energy in the Arrhenius law for the temperature acceleration factor, and that AlL=1 dB is a typical standard for judging a failure. A matrix table is alsoincluded whichindicatesthetemperatureandhumidityforacceleration tests.For samples that do not fail during the test period, the estimate is made by extrapolating IL. While performance should be monitored during the test, at least six or more measurements are required in the case where it cannot be monitored. It shows the procedure to prepare a lifetime distribution based on the test results and to calculate the fit-rate. In the case of random failures, calculation should be conducted using the field fit rate and/or using the data of long-term reliability testing for one year or longer. In this case, a one-sided upper confidence interval should be used in Poisson approximations,and the Kai squared distribution is used for statistical analysis. In the case of random failure, mishandling by users should be considered. 4.3.4 IEc62005-3,Reliability of fibreoptic interconnecting devices andpassive components-Part 3:Relevant tests for evaluating failure modes and failure mechanismsforpassivecomponents This international standard explains the method of failure mode effect analysis (FMEA). FMEA tables for passiveoptical components,optical connectors,and spliceareincluded.FMEA tablesareusedto summarisethefunctions,failure modes,andthe degradation acceleration factors byeach factor for optical passive components that are composed of differentparts and materials, and indicates test methods corresponding to each factor. Test items and these conditions for reliability may be analysed using FMEA. 4.3.5 IEc62005-4,Reliability of fibre optic interconnecting devices and passive opticalcomponents-Part4:Productscreening This international standard contains information on screening. It describes the purpose of screening, namely reducing the initial failure and lowering the bathtub curve. Furthermore, it indicates the guidelines to select screening items and conditions (i.e. identifying a failure mode, it is prohibited to shorten the life-time, it should be easy, etc.) and explains the necessityof feedbackoffielddata.Typical screeningconditionsare alsolisted.Thecontents are general and may apply not only to interconnecting devices and passive optical componentsbutalsootherdevices and components. 4.3.6 IEc62005-5,Reliabilityoffibreopticinterconnectingdevicesandpassive opticalcomponents-Part5:Relatingacceleratedteststostandardizedservice environments Thisproposednewworkitemdescribestheacceleratedtestscorrespondingtothe standardisedserviceenvironmentsandemphasises that theaccelerated test should be conducted in each environment category. Typically, an accelerated test is conducted under steady temperature and/or humidity conditions, or under cyclical test conditions. The steady TR 62721 @IEC:2012(E) 12- state test accelerates the chemical change, diffusion,corrosion, and water permeation, while the test under cyclical test conditions may also cause a mechanical change by relative expansion and contraction.When selecti