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ETSIES202971V1.2.1(2006-03)ETSIStandardAccessandTerminals(AT);PublicSwitchedTelephoneNetwork(PSTN);Harmonizedspecificationofphysicalandelectricalcharacteristicsofa2-wireanalogueinterfaceforshortlineinterfaceETSIETSIES202971V1.2.1(2006-03)2ReferenceRES/AT-010131Keywords2-wire,access,analogue,interface,POTS,PSTNETSI650RoutedesLuciolesF-06921SophiaAntipolisCedex-FRANCETel.:+33492944200Fax:+33493654716SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88ImportantnoticeIndividualcopiesofthepresentdocumentcanbedownloadedfrom:(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.Usersofthepresentdocumentshouldbeawarethatthedocumentmaybesubjecttorevisionorchangeofstatus.InformationonthecurrentstatusofthisandotherETSIdocumentsisavailableat:©EuropeanTelecommunicationsStandardsInstitute2006.Allrightsreserved.DECTTM,PLUGTESTSTMandUMTSTMareTradeMarksofETSIregisteredforthebenefitofitsMembers.TIPHONTMandtheTIPHONlogoareTradeMarkscurrentlybeingregisteredbyETSIforthebenefitofitsMembers.3GPPTMisaTradeMarkofETSIregisteredforthebenefitofitsMembersandofthe3GPPOrganizationalPartners.ETSIETSIES202971V1.2.1(2006-03)3ContentsIntellectualPropertyRights................................................................................................................................5Foreword.............................................................................................................................................................5Introduction........................................................................................................................................................51Scope........................................................................................................................................................62References................................................................................................................................................63Definitions,symbolsandabbreviations...................................................................................................83.1Definitions..........................................................................................................................................................83.2Symbols..............................................................................................................................................................93.3Abbreviations.....................................................................................................................................................94General.....................................................................................................................................................95Physicalconnections..............................................................................................................................105.1Mechanicalaspects...........................................................................................................................................105.2Supportofmorethanoneterminal...................................................................................................................115.2.1Wiringarrangement....................................................................................................................................115.2.2Loadingfactors...........................................................................................................................................116DCfeedconditions.................................................................................................................................116.1Polarity.............................................................................................................................................................116.2Quiescentstate..................................................................................................................................................116.2.1Maximumvoltage.......................................................................................................................................116.2.2Minimumvoltage........................................................................................................................................116.2.3Supplyinterruption............................
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本文标题：ETSI ES 202 971 V1.2.1 (2006-03) Access and Termin
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