SIST EN 300 689 V1.2.1:2004

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Dostop in terminali (AT) - Digitalni zakupljeni vodi za prenosno hitrost 34 Mbit/s (D34U, D34S) - Vmesnik terminalske opremeAccess and Terminals (AT); 34 Mbit/s digital leased lines (D34U and D34S); Terminal equipment interface33.040.50Vodi, zveze in tokokrogiLines, connections and circuitsICS:Ta slovenski standard je istoveten z:EN 300 689 Version 1.2.1SIST EN 300 689 V1.2.1:2004en01-oktober-2004SIST EN 300 689 V1.2.1:2004SLOVENSKI
STANDARD



SIST EN 300 689 V1.2.1:2004



ETSIEN300689V1.2.1(2001-07)EuropeanStandard(Telecommunicationsseries)AccessandTerminals(AT);34Mbit/sdigitalleasedlines(D34UandD34S);TerminalequipmentinterfaceSIST EN 300 689 V1.2.1:2004



ETSIETSIEN300689V1.2.1(2001-07)2ReferenceREN/AT-020009Keywordsaccess,digital,interface,leasedline,ONP,terminalETSI650RoutedesLuciolesF-06921SophiaAntipolisCedex-FRANCETel.:+33492944200Fax:+33493654716SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88ImportantnoticeIndividualcopiesofthepresentdocumentcanbedownloadedfrom:http://www.etsi.orgThepresentdocumentmaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.Usersofthepresentdocumentshouldbeawarethatthedocumentmaybesubjecttorevisionorchangeofstatus.InformationonthecurrentstatusofthisandotherETSIdocumentsisavailableathttp://www.etsi.org/tb/status/Ifyoufinderrorsinthepresentdocument,sendyourcommentto:editor@etsi.frCopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2001.Allrightsreserved.SIST EN 300 689 V1.2.1:2004



ETSIETSIEN300689V1.2.1(2001-07)3ContentsIntellectualPropertyRights.5Foreword.5Introduction.61Scope.72References.73Definitionsandabbreviations.83.1Definitions.83.2Abbreviations.84Requirements.94.1Mechanicalcharacteristics.94.1.1Sockets.104.1.2Plugs.104.2Electricalcharacteristics.104.2.1Outputport.104.2.1.1Signalcoding.104.2.1.2Waveformshape.104.2.1.3Outputtiming.114.2.1.4Outputreturnloss.124.2.1.5Outputjitter.124.2.1.6Outputframestructure.124.2.2Inputport.134.2.2.1Signalcoding.134.2.2.2Inputreturnloss.134.2.2.3Inputlosstolerance.134.2.2.4Immunityagainstreflections.134.2.2.5Inputjittertolerance.134.2.2.6Inputclocktolerance.144.2.2.7Inputframestructure.144.2.2.8Framealignmentprocedure.144.3Safety.154.4Overvoltage.154.5ElectroMagneticCompatibility(EMC).15AnnexA(normative):Testmethods.16A.1General.16A.1.1Additionalinformationtosupportthetest.16A.1.2Equipmentconnection.16A.2Testmethods.17A.2.1Signalcodingattheoutputport.17A.2.2Waveformshapeattheoutputport.17A.2.3Outputtiming.18A.2.4Inputsignalcoding,losstoleranceandimmunityagainstreflections.19A.2.5Inputreturnloss.20A.2.6Outputreturnloss.21A.2.7Inputandoutputjitter.22A.2.8Framestructure.23A.2.9Framealignmentprocedure.24AnnexB(normative):DefinitionofHDB3code.26B.1General.26B.2Definition.26SIST EN 300 689 V1.2.1:2004



ETSIETSIEN300689V1.2.1(2001-07)4AnnexC(normative):Definitionofframestructure.27C.1Framestructureat34368kbit/s.27C.1.1Trailaccesspointidentifierformat.28C.1.1.1CRC-7calculation-multiplicationanddivisionprocess.29C.1.1.2CRC-7calculation-encodingprocedure.29C.1.1.3CRC-7calculation-decodingprocedure.29AnnexD(normative):RequirementsTable(RT).30AnnexE(informative):Bibliography.31History.32SIST EN 300 689 V1.2.1:2004



ETSIETSIEN300689V1.2.1(2001-07)5IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinETSISR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://www.etsi.org/ipr).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinETSISR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbyETSITechnicalCommitteeAccessandTerminals(AT).ThepresentdocumentresultedfromamandatefromtheCommissionoftheEuropeanCommunity(CEC)toprovidestandardsforthesupportoftheDirectiveonOpenNetworkProvision(ONP)ofleasedlines(92/44/EEC).Therearetwootherstandardsdirectlyrelatedtothepresentdocument:-EN300686:"AccessandTerminals(AT);34Mbit/sand140Mbit/sdigitalleasedlines(D34U,D34S,D140U,D140S);Networkinterfacepresentation";-EN300687:"AccessandTerminals(AT);34Mbit/sdigitalleasedlines(D34UandD34S);Connectioncharacteristics".ThepresentdocumentisbasedoninformationfromITU-TRecommendationsandETSIpublicationsandtherelevantdocumentsarequotedwhereappropriate.NationaltranspositiondatesDateofadoptionofthisEN:29June2001DateoflatestannouncementofthisEN(doa):30September2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31March2002DateofwithdrawalofanyconflictingNationalStandard(dow):31March2002SIST EN 300 689 V1.2.1:2004



ETSIETSIEN300689V1.2.1(2001-07)6IntroductionTheCouncilDirectiveontheapplicationofONPtoleasedlines(92/44/EEC)concernstheharmonizationofconditionsforopenandefficientaccessto,anduseof,theleasedlinesprovidedoverpublictelecommunicationsnetworks,andtheavailabilitythroughouttheEuropeanUnionofaminimumsetofleasedlineswithharmonizedtechnicalcharacteristics.The34Mbit/sunstructuredandstructuredleasedlinesarenotpartoftheminimumsetofleasedlinesundertheleasedlineDirective,howeverthesestandardsarebeingwrittenwiththeintentionthatwhere34Mbit/sleasedlinesareoffered,theywillbeinaccordancewiththeseharmonizedstandards.Twocategories(voluntaryandregulatory)ofstandardwereusedfortheinterfacesofterminalequipmentdesignedforconnectiontotheONPleasedlines.TechnicalBasisforRegulations(TBRs)gavetheearlieressentialrequirementsundertheDirective91/263/EEC(seeannexE),laterreplacedby98/13/EC(seeannexE),forattachmenttotheleasedlines,whereasothervoluntarystandards(ETSsorENs)gavethefulltechnicalspecificationsfortheseinterfaces.Thepresentdocument,whichisbasedonanearlierETS,belongstothesecondcategory.TherequirementsofTBR24(seeannexE)areasubsetofthepresentdocument.Thepresentversionofthepresentdocumenthasbeenproducedtointroducesomenecessarychanges.ETS300166(seeannexE)andITU-TRecommendationG.703[4]wereusedasthebasisfortheterminalequipmentinterfaceaspectsofthepresentdocument.SIST EN 300 689 V1.2.1:2004



ETSIETSIEN300689V1.2.1(2001-07)71ScopeThepresentdocumentspecifiesthemechanicalandelectricalcharacteristics(exceptsafety,overvoltageandEMCaspects),thenecessaryfunctionalcharacteristicsandthecorrespondingconformancetestsforaterminalequipmentinterfacefor:-connectiontothenetworkterminationpointsof34368kbit/sdigitalunstructuredleasedlines(D34U);and-connectiontothenetworkterminationpointsof34368kbit/sdigitalstructuredleasedlines(D34S)whichsupportanunstructured33920kbit/sinformationtransferrate.TheseleasedlinesaredefinedinEN300686[7]andEN300687[8].Thepresentdocumentiswrittenonlytoensurethattheinterfaceoftheterminalequipmentiscompatiblewiththe34Mbit/sdigitalunstructuredorstructuredleasedline.Thepresentdocumentisapplicabletoallinterfacesdesignedforconnectiontotheleasedline,howeverinthecasesofapparatusthatcarriesaparticularservice,ofcomplexapparatusandofapparatusinprivatenetworks,otherrequirementsmayapplyinadditiontothepresentdocument.CustomerpremiseswiringandinstallationbetweentheterminalequipmentandtheNetworkTerminationPoint(NTP)areoutsidethescopeofthepresentdocument.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.[1]IEC60169-8(1978):"Radiofrequencyconnectors;Part8:R.Fcoaxialconnectorswithinnerdiametersofouterconductor6,5mm(0,256in)withbayonetlock-Characteristicimpedance50ohms(TypeBNC)".[2]IEC60169-13(1976):"Radiofrequencyconnectors;Part13:R.F.coaxialconnectorswithinnerdiameterofouterconductor5,6mm(0,22in)-Characteristicimpedance75ohms(Type1,6/5,6)-Characteristicimpedance50ohms(Type1,8/5,6)withsimilarmatingdimensions".[3]ISO/IEC10173(1998):"Informationtechnology-Telecommunicationsandinformationexchangebetweensystems-InterfaceconnectorandcontactassignmentsforISDNprimaryrateaccessconnectorlocatedatreferencepointsSandT".[4]ITU-TRecommendationG.703(1998):"Physical/electricalcharacteristicsofhierarchicaldigitalinterfaces".[5]ITU-TRecommendationO.151(1992):"Errorperformancemeasuringequipmentoperatingattheprimaryrateandabove".[6]ITU-TRecommendationO.171(1997):"Timingjitterandwandermeasuringequipmentfordigitalsystemswhicharebasedontheplesiochronousdigitalhierarchy(PDH)".[7]ETSIEN300686:"AccessandTerminals(AT);34Mbit/sand140Mbit/sdigitalleasedlines(D34U,D34S,D140U,D140S);Networkinterfacepresentation".[8]ETSIEN300687:"AccessandTerminals(AT);34Mbit/sdigitalleasedlines(D34UandD34S);Connectioncharacteristics".SIST EN 300 689 V1.2.1:2004



ETSIETSIEN300689V1.2.1(2001-07)83Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:frame:repetitivesetofconsecutivebitsinwhichthepositionofeachbitcanbeidentifiedbyreferencetoaframealignmentsignalframealignmentsignal:distinctivesignalinsertedineveryframealwaysoccupyingthesamerelativepositionwithintheframeandusedtoestablishandmaintainframealignmentleasedlines:telecommunicationsfacilitiesprovidedbyapublictelecommunicationsnetworkthatprovidedefinedtransmissioncharacteristicsbetweennetworkterminationpointsandthatdonotincludeswitchingfunctionsthattheusercancontrol,(e.g.on-demandswitching)NetworkTerminationPoint(NTP):allphysicalconnectionsandtheirtechnicalaccessspecificationswhichformpartofthepublictelecommunicationsnetworkandarenecessaryforaccesstoandefficientcommunicationthroughthatpublicnetworkPRBS(223-1):PseudoRandomBitSequence(PRBS)(asdefinedinclause2.2ofITU-TRecommendationO.151)terminalequipment:equipmentintendedtobeconnectedtothepublictelecommunicationsnetwork,i.e.:-tobeconnecteddirectlytotheterminationofapublictelecommunicationnetwork;or-tointerworkwithapublictelecommunicationsnetworkbeingconnecteddirectlyorindirectlytotheterminationofapublictelecommunicationsnetwork;inordertosend,process,orreceiveinformation3.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:AISAlarmindicationSignalAMIAlternateMarkInversionASCIIAmericanStandardCodeforInformationInterchangeATMAsynchronousTransferModeBIP-8BitInterleavedParity(8bit)BNCBayonetNutConnectorCRC-7CyclicRedundancyCheck(7bit)dcdirectcurrentD34S34Mbit/sdigitalstructuredleasedlineD34U34Mbit/sdigitalunstructuredleasedlineEMErrorMonitoringEMCElectroMagneticCompatibilityFA1FrameAlignmentbyte1FA2FrameAlignmentbyte2FASFrameAlignmentSignalGCGeneralpurposeCommunicationschannelHDB3HighDensityBipolarcode3LOFLossOfFrameLOSLossOfSignalLSBLeastSignificantBitMAMaintenanceandAdaptationMSBMostSignificantBitNRNetworkoperatorbyteNTPNetworkTerminationPointONPOpenNetworkProvisionppmpartspermillionSIST EN 300 689 V1.2.1:2004



ETSIETSIEN300689V1.2.1(2001-07)9PRBSPseudoRandomBitSequenceRDIRemoteDefectIndicationREIRemoteErrorIndicationRTRequirementsTableRXRXisasignalinput(ateithertheterminalequipmentorthetestequipment,seefigure1)SDHSynchronousDigitalHierarchyTMTimingMarkerTUTributaryUnitTRTRailtraceTTITrailTraceIdentifierTXTXisasignaloutput(ateithertheterminalequipmentorthetestequipment,seefigure1)UIUnitInterval4RequirementsTheD34U34368kbit/sunstructuredleasedlineprovidesabi-directionalpoint-to-pointdigitalleasedlineforthesupportofanunstructured34368kbit/sinformationtransferrate.Anystructuringofthedataistheresponsibilityoftheuser.TheD34S34368kbit/sstructuredleasedlineprovidesabi-directionalpoint-to-pointdigitalleasedlineforthesupportofanunstructured33920kbit/sinformationtransferrate.Anystructuringofthedatawithinthetransparent33920kbit/spartoftheframeistheresponsibilityoftheuser.ForbothD34UandD34Stheprovisionoftimingistheresponsibilityoftheuser;however,incertaininstallationstheleasedlineprovidermaybeabletoofferaleasedlinethatissynchronizedtothenetwork.4.1MechanicalcharacteristicsTheterminalequipmentshallprovideatleastoneofthemethodsofconnectiongiveninclauses4.1.1and4.1.2.NOTE1:WhenconnectingtheterminalequipmenttotheNTP,anydifferenceingroundpotentialbetweenthetwoequipmentsmayproduceavoltageacrossthesignalgroundconnectionandmaycausedamage.SeeEN50310(seeannexE)fordetailsofearthingrequirementswithinthecustomer'spremises.NOTE2:Thetransmitpairistheoutputfromtheterminalequipmentinterface.Thereceivepairistheinputtotheterminalequipmentinterface,asshowninfigure1.Wheretheterms"output"and"input"areusedwithoutqualificationinthepresentdocument,theyrefertotheterminalequipmentinterface.NOTE3:Normalpracticeisfortheouterconductorsoftheinputandoutputconnectorstobeconnectedviaadcpathtothesignalgroundandthencetoground.ThisconnectionistoreduceEMCemissions.IfthereisadifferenceingroundpotentialbetweentheterminalequipmentandtheNTP,thisarrangementmayresultinhighcurrentsintheouterconductorsandcausedamage.Topreventthisproblem,dcisolationmaybeintroducedbetweentheterminalequipmentandtheNTP,forexamplebyintroducingdcisolationbetweentheouterconductorandthesignalgroundintheterminalequipment.Carefulattentionshouldbegiventotherequirementsofstandardsoninstallationearthingpractice.NETWORKINTERFACETXRXOUTPUTINPUTOUTPUTINPUTRXTERMINALEQUIPMENTINTERFACETXFigure1SIST EN 300 689 V1.2.1:2004



ETSIETSIEN300689V1.2.1(2001-07)104.1.1SocketsRequirement:Theterminalequipmentinterfaceshallprovidetwocoaxial75Ωsockets,oneeachfortransmitandreceive;thesesocketsbeingeither:a)75Ωsockets(type1,6/5,6)complyingwithIEC60169-13[2];orb)75ΩBNCsocketscomplyingwiththegeneralrequirementsofIEC60169-8[1]withthematingdimensionsspecifiedinannexBofISO/IEC10173[3].Theouterconductorofthecoaxialpairshallbeconnectedtosignalgroundbothattheinputportandattheoutputport.Test:Thereshallbeavisualinspectionthatthesocketsareofthecorrecttype.4.1.2PlugsRequirement:Theterminalequipmentinterfaceshallprovidetwocoaxial75Ωplugsattheendofacord(orcords),oneeachfortransmitandreceive;theseplugsbeingeither:a)75Ωplugs(type1,6/5,6)complyingwithIEC60169-13[2];orb)75ΩBNCplugscomplyingwiththegeneralrequirementsofIEC60169-8[1]withthematingdimensionsspecifiedinannexBofISO/IEC10173[3].Theouterconductorofthecoaxialpairshallbeconnectedtosignalgroundbothattheinputportandattheoutputport.NOTE:Thereisnorequirementonthemethodofconnectionofthecord(orcords)totheterminalequipment.Test:Thereshallbeavisualinspectionthattheplugsareofthecorrecttype.4.2Electricalcharacteristics4.2.1Outputport4.2.1.1SignalcodingRequirement:ThesignaltransmittedattheoutputportshallcomplywiththeHighDensityBipolarcode3(HDB3)encodingrules(seeannexB).Test:ThetestshallbeconductedaccordingtoclauseA.2.1.4.2.1.2WaveformshapeRequirement:Thepulseattheoutputportshallcomplywiththerequirementsgivenintable1andfigure2;basedonITU-TRecommendationG.703[4].Table1:WaveformshapeatoutputportPulseshape(nominallyrectangular)Allmarksofavalidsignalshallconformwiththemask(seefigure2).ThevalueVcorrespondstothenominalpeakvoltageofamark.Testloadimpedance75Ωnon-reactiveNominalpeakvoltageVofamark1,0VPeakvoltageofaspace0±0,1VNominalpulsewidth14,55nsRatiooftheamplitudesofpositiveandnegativepulsesatthecentreofthepulseinterval0,95to1,05Ratioofthewidthsofpositiveandnegativepulsesatthenominalhalfamplitude0,95to1,05SIST EN 300 689 V1.2.1:2004



ETSIETSIEN300689V1.2.1(2001-07)1117ns(14,55+2,45)8,65ns(14,55-5,90)14,55ns12,1ns(14,55-2,45)V1,00,50Nominalpulse29,1ns(14,55+14,55)0,20,10,10,20,20,10,10,10,124,5(14,55+9,95)Figure2:Pulsemaskfor34Mbit/spulseTest:ThetestshallbeconductedaccordingtoclauseA.2.2.4.2.1.3OutputtimingTheterminalequipmentmayderiveitstimingfrom:a)aninternalsource(e.g.aninternalclock);b)anexternalreferencesignalinput;c)thereceivedsignalattheinputport.Requirement:Foreachofthetimingarrangementsintendedforuse,thebitrateattheoutputportshallbewithinthelimitsof34368kbit/s±20partspermillion(ppm),whenanyrelevantexternalsignal,includingthereceivedsignalattheinputport,iswithinitsstatedtolerance.NOTE:Thetoleranceof±20ppmrelatestothetransmissioncapabilityoftheleasedline.Tighterlimitsmaybeneededtoensuresatisfactoryend-to-endinterworkingwiththedistantterminalequipment.SIST EN 300 689 V1.2.1:2004



ETSIETSIEN300689V1.2.1(2001-07)12Test:ThetestshallbeconductedaccordingtoclauseA.2.3.4.2.1.4OutputreturnlossRequirement:Theoutputreturnlossattheterminalequipmentinterface,withrespectto75Ω,shallbegreaterthanorequaltothevaluesgivenintable2,whichistakenfromannex3ofETS300166(seeannexE).Table2:OutputportminimumreturnlossFrequencyrangeReturnloss860kHzto1720kHz1720kHzto51550kHz6dB8dBTest:ThetestshallbeconductedaccordingtoclauseA.2.6.4.2.1.5OutputjitterRequirement:Thepeak-to-peakoutputjittershallnotexceedthelimitsoftable3whenmeasuredwithabandpassfilterwithlinearcut-offwiththedefinedcut-offfrequencies.Atfrequenciesbelowthelower3dBpoint,theattenuationofthehighpassfiltershallrisewithavaluegreaterthan,orequalto,20dBperdecade.Atfrequenciesabovetheupper3dBpoint,theattenuationofthelowpassfiltrationshallrisewithavaluegreaterthan,orequalto,60dBperdecade.Forthepurposeoftesting,anysignalinputfromwhichtheoutputtimingisderivedshallbeprovidedwiththemaximumtolerableinputjitter,andwiththemaximumtolerableinputfrequencydeviation,asspecifiedbythemanufacturer.Wheretheoutputtimingoftheterminalequipmentistakenfromtheleasedline,theinputtotheterminalequipmentshallbeprovidedwithcomponentsofsinusoidaljitteratpointsonthecurveoffigure3andtable5.Table3:MaximumoutputjitterMeasurementfilterbandwidthOutputjitterLowercut-off(highpass)Uppercut-off(lowpass)UnitInterval(UI)peak-to-peak(maximum)100Hz800kHz0,410kHz800kHz0,15NOTE:Thesevaluesarechosentoallowforjitterbuild-upinusernetworksandmaybedifferentfromITU-TRecommendations.Test:ThetestshallbeconductedaccordingtoclauseA.2.7.4.2.1.6OutputframestructureTherequirementofthisclauseappliestoterminalequipmentforconnectiontotheD34Sleasedline.ForterminalequipmentsforconnectiontotheD34Uleasedline,thereisnorequirementonthestructureoftheoutputbitstream.Requirement:ForterminalequipmentsforconnectiontotheD34Sleasedline,thebitstreamtransmittedattheoutputoftheterminalequipmentshallbestructuredasdefinedinannexC.Bit1ofbyteMaintenanceandAdaptation(MA),aRemoteDefectIndication(RDI),shallbesetto"1"within250µsofthedetectionoflossofreceivedframealignment(seeclause4.2.2.8),andsetto"0"within250µsongainingframealignment.Test:ThetestshallbeconductedaccordingtoclauseA.2.8andA.2.9.SIST EN 300 689 V1.2.1:2004



ETSIETSIEN300689V1.2.1(2001-07)134.2.2Inputport4.2.2.1SignalcodingRequirement:TheinputportshalldecodewithouterrorHDB3encodedsignalsinaccordancewithHDB3encodingrules(seeannexB).Test:ThetestshallbeconductedaccordingtoclauseA.2.4.4.2.2.2InputreturnlossRequirement:Theinputreturnlosswithrespectto75Ωattheinterfaceshallbegreaterthanorequaltothevaluesgivenintable4,whichistakenfromclause11.3ofITU-TRecommendationG.703[4].Table4:InputportminimumreturnlossFrequencyrangeReturnloss860kHzto1720kHz1720kHzto34368kHz34368kHzto51550kHz12dB18dB14dBTest:ThetestshallbeconductedaccordingtoclauseA.2.5.4.2.2.3InputlosstoleranceRequirement:Theinputportshalldecodewithouterrorsa34368kbit/ssignalasdefinedinclauses4.2.1.1and4.2.1.2abovebutmodifiedbyacableorartificialcablewiththefollowingcharacteristics:a)attenuationthatfollowsa√flawwithvaluesthroughouttherange0dBto12dBat17184kHz;andb)characteristicimpedanceof75Ωwithatoleranceof±20%overthefrequencyrangefrom860kHzto51550kHz.Test:ThetestshallbeconductedaccordingtoclauseA.2.4.4.2.2.4ImmunityagainstreflectionsRequirement:Whenasignalcomprisingacombinationofanormalsignalandaninterferingsignalisappliedtotheinputport,viaanartificialcablewithalossintherange0dBto12dBat17184kHz,noerrorsshallresultduetotheinterferingsignal.ThenormalsignalshallbeasignalencodedaccordingtoHDB3,shapedaccordingtothemaskoffigure2,withabinarycontentinaccordancewithaPRBS(223-1).Theinterferingsignalshallbethesameasthenormalsignalexceptthatthelevelshallbeattenuatedby20dB,thebitrateshallbewithin34368kbit/s±20ppmandthetimingshallnotbesynchronizedtothenormalsignal.Test:ThetestshallbeconductedaccordingtoclauseA.2.4.4.2.2.5InputjittertoleranceRequirement:Theterminalequipmentshalltolerateatitsinputportthemaximuminputjitterasshowninfigure3andtable5(takenfromITU-TRecommendationG.823(seeannexE)).NOTE:Terminalequipmentwithmorethanoneinputwillnormallyneedtobedesignedwithawanderbufferofatleast18microseconds,however,toaccommodatethewanderthatmaybeproducedbySynchronousDigitalHierarchy(SDH)networks,upto40microsecondsmaybeneeded.SIST EN 300 689 V1.2.1:2004



ETSIETSIEN300689V1.2.1(2001-07)14peak-to-peakjitterjitterfrequencyf1f2f3f4A1A2Figure3:InputjittertoleranceTable5:InputjittertolerancePeak-to-peakamplitude(UI)FrequencyA1A2f1f2f3f41,50,15100Hz1kHz10kHz800kHzTest:ThetestshallbeconductedaccordingtoclauseA.2.7.4.2.2.6InputclocktoleranceRequirement:TheterminalequipmentshalldecodewithouterrorHDB3encodedsignals,asdefinedinannexB,forallbitrateswithinthelimitsof34368kbit/s±20ppm.Test:ThetestshallbeconductedaccordingtoclauseA.2.7.4.2.2.7InputframestructureTherequirementofthisclauseappliestoterminalequipmentforconnectiontotheD34Sleasedline.ForterminalequipmentsforconnectiontotheD34Uleasedline,thereisnorequirementonthestructureoftheinputbitstream.Requirement:TheinputportshallacceptaninputbitstreamwithaframestructureasdefinedinannexC.Theterminalequipmentshallbecapableofachievingframealignment,asdetailedinclause4.2.2.8,inordertoseparatetheuserdatafromtheframeinformation.Test:ThetestshallbeconductedaccordingtoclauseA.2.4.4.2.2.8FramealignmentprocedureTherequirementofthisclauseappliestoterminalequipmentforconnectiontotheD34Sleasedline.ForterminalequipmentsforconnectiontotheD34Uleasedline,thereisnorequirementontheframealignmentprocedure.Requirement:Theterminalequipmentshallperformaframealignmentprocedureonthe34368kbit/ssignalinordertogainortorecoverframealignment.Toobtainframealignment,theterminalequipmentshallsearchfortheFA1,FA2bytescontainedwithinthereceivedbitstream.Framealignmentshallbecontinuouslycheckedwiththepresumedframestartpositionforthecorrectframealignment.SIST EN 300 689 V1.2.1:2004



ETSIETSIEN300689V1.2.1(2001-07)15Framealignmentshallbeconsideredtohavebeenobtained,orrecovered,whenthreeconsecutivenon-erroredframealignmentsignals(FA1andFA2)havebeenfound.Framealignmentshallbeconsideredtohavebeenlostwheneither:a)fourconsecutiveframealignmentsignals(FA1andFA2)aredetectedinerror(i.e.≥1errorineachFA1andFA2);orb)986ormoreframeswithoneormoreBIP-8violationsaredetectedinablockof1000frames.Whenframealignmentisach
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