ETSI EN 300 766 V1.2.1 (2001-07)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.NAccess and Terminals (AT); Multiple 64 kbit/s digital unrestricted leased lines with octet integrity presented at a structured 2 048 kbit/s interface at either or both ends (D64M); Connection characteristics and network interface presentation33.040.50Vodi, zveze in tokokrogiLines, connections and circuitsICS:Ta slovenski standard je istoveten z:EN 300 766 Version 1.2.1SIST EN 300 766 V1.2.1:2004en01-oktober-2004SIST EN 300 766 V1.2.1:2004SLOVENSKI
STANDARD



SIST EN 300 766 V1.2.1:2004



ETSIEN300766V1.2.1(2001-07)EuropeanStandard(Telecommunicationsseries)AccessandTerminals(AT);Multiple64kbit/sdigitalunrestrictedleasedlineswithoctetintegritypresentedatastructured2048kbit/sinterfaceateitherorbothends(D64M);ConnectioncharacteristicsandnetworkinterfacepresentationSIST EN 300 766 V1.2.1:2004



ETSIETSIEN300766V1.2.1(2001-07)2ReferenceREN/AT-020011Keywordsdigital,interface,leasedline,ONP,testingETSI650RoutedesLuciolesF-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 300 766 V1.2.1:2004



ETSIETSIEN300766V1.2.1(2001-07)3ContentsIntellectualPropertyRights.5Foreword.5Introduction.61Scope.72References.73Definitionsandabbreviations.83.1Definitions.83.2Abbreviations.94Overview(informative).95Connectioncharacteristics.105.1Summaryofattributes.115.2Informationtransferrate.115.3Informationtransfersusceptance.115.4Structureandoctetintegrity.115.5Establishmentofconnection.125.6Symmetry.125.7Transmissiondelay.125.8Controlledslip.135.9Erroredseconds.135.10Severelyerroredseconds.135.11Availability.136Interfacecharacteristics-2048kbit/sinterface.146.1Connectionarrangements.146.2Framestructure.146.2.1General.146.2.22048kbit/sdigitalstructuredONPleasedline(CRC-4).146.2.3UseoftheE-bits.146.2.4Framesynchronizationanddatatransmissioncapability.146.2.5Multiframealignment.146.3Outputsignalcoding.156.4Outputwaveformshape.156.5Outputtiming.156.6Outputtimingunderfailureconditions.156.7Outputimpedancetowardsground.156.8Outputjitter.156.9Inputsignalcoding.156.10Inputreturnloss.156.11Inputlosstolerance.166.12Inputimmunityagainstreflections.166.13Tolerablelongitudinalvoltages.166.14Impedancetowardsground.166.15Inputjittertolerance.167Interfacecharacteristics-64kbit/sinterface.167.1Connectionarrangements.167.2Outputsignalcodingandoctetstructure.167.3Outputwaveformshape.167.4Outputtiming.177.5Outputtimingunderfailureconditions.177.6Outputjitter.177.7Impedancetowardsground.177.8Longitudinalconversionloss.17SIST EN 300 766 V1.2.1:2004



ETSIETSIEN300766V1.2.1(2001-07)47.9Inputsignalcodingandoctetstructure.177.10Inputjittertolerance.177.11Inputreturnloss.177.12Inputlosstolerance.187.13Immunityagainstreflections.187.14Impedancetowardsground.187.15Longitudinalconversionloss.188Safety.189ElectroMagneticCompatibility(EMC).1810Overvoltage.18AnnexA(normative):Testmethods.19A.1General.19A.1.1Additionalinformationtosupportthetest.19A.1.2Equipmentconnection.19A.2Maintest.20AnnexB(informative):Bibliography.21History.22SIST EN 300 766 V1.2.1:2004



ETSIETSIEN300766V1.2.1(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).Therearesixotherstandardsdirectlyrelatedtothepresentdocument:-EN300288:"AccessandTerminals(AT);64kbit/sdigitalunrestrictedleasedlinewithoctetintegrity(D64U);Networkinterfacepresentation";-EN300289:"AccessandTerminals(AT);64kbit/sdigitalunrestrictedleasedlinewithoctetintegrity(D64U);Connectioncharacteristics";-EN300290:"AccessandTerminals(AT);64kbit/sdigitalunrestrictedleasedlinewithoctetintegrity(D64U);Terminalequipmentinterface";-EN300418:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredandstructuredleasedlines(D2048UandD2048S);Networkinterfacepresentation";-EN300419:"AccessandTerminals(AT);2048kbit/sdigitalstructuredleasedlines(D2048S);Connectioncharacteristics";-EN300420:"AccessandTerminals(AT);2048kbit/sdigitalstructuredleasedlines(D2048S);Terminalequipmentinterface".ThepresentdocumentisbasedoninformationfromITU-TRecommendationsandETSIpublicationsandtherelevantdocumentsarequotedwhereappropriate.Thepresentdocumenthasbeenwrittenasa"delta"documenttotheexistingstandardsfor64kbit/sand2048kbit/sleasedlines.Itusesrequirementsfromthesestandardsbycross-referencewithmodificationsasnecessarytothetest.Theconfigurationscoveredbythepresentdocumentcouldhavebeenaddressedbymodifyingtheexistingstandardsfor64kbit/sand2048kbit/sleasedlinestomakethemmoremodularsothatthe64kbit/sconnectioncharacteristicscouldbeusedinconjunctionwiththe2048kbit/sstructuredinterface.Insomewaysthiswouldhavebeenatidiersolution,butitwouldinvolveconsiderableadditionalactivitybecausetheexistingstandardsfor64kbit/sand2048kbit/sleasedlineswere,atthetimeofcreationofthepresentdocument(seealsotheintroductionofthepresentdocument),thesubjectofregulationandreferencestothemintheannexoftheONPleasedlineDirectivewouldhavetobechanged.SIST EN 300 766 V1.2.1:2004



ETSIETSIEN300766V1.2.1(2001-07)6NationaltranspositiondatesDateofadoptionofthisEN:29June2001DateoflatestannouncementofthisEN(doa):30September2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31March2002DateofwithdrawalofanyconflictingNationalStandard(dow):31March2002IntroductionTheCouncilDirectiveontheapplicationofONPtoleasedlines(92/44/EEC)concernstheharmonizationofconditionsforopenandefficientaccessto,anduseof,theleasedlinesprovidedoverpublictelecommunicationsnetworksandtheavailabilitythroughouttheEuropeanUnion(EU)ofaminimumsetofleasedlineswithharmonizedtechnicalcharacteristics.OthercountriesoutsidetheEUmayalsochoosetoprovideleasedlinesaccordingtothestandardsproducedtosupporttheDirective.TheconsequenceoftheDirectiveisthattelecommunicationsorganizationswithintheEUshallmakeavailableasetofleasedlinesbetweenpointsinthesecountrieswithspecifiedconnectioncharacteristicsandspecifiedinterfaces.UndertheDirective91/263/EEC(seeannexB),laterreplacedby98/13/EC(seeannexB),TerminalEquipment(TE)forconnectiontotheseleasedlineswasrequiredtofulfilcertainessentialrequirements.Thepresentversionofthepresentdocumenthasbeenproducedtointroducesomenecessarychanges.TheleasedlinespecifiedinthepresentdocumentisnotincludedintheminimumsetwhoseprovisionisrequiredunderDirective92/44/EEC(seeannexB),howeverthepresentdocumentiswrittenasa"delta"documentbasedonthespecificationsforthe2048kbit/sdigitalstructuredONPleasedline(D2048S)and64kbit/sdigitalunrestrictedONPleasedlinewithoctetintegrity(D64U)leasedlines.ETS300166andITU-TRecommendationG.703(seeannexB)wereusedasthebasisfortheinterfacepresentationrequirements.ETS300167,ITU-TRecommendationsG.704andG.706(seeannexB)wereusedasthebasisforthestructureofthe2048kbit/sinterface.Thepresentdocumentdoesnotapplytoterminalequipment.EN300290[4]applieswithoutmodificationtoTEintendedforconnectiontothe64kbit/sinterfaceoftheleasedline.IntheoryEN300420[6]shouldbemodifiedtodefinethetimeslotstructureforterminalsintendedforconnectionto2048kbit/sinterfacesthatpresent64kbit/sleasedlines.However,themodificationistootrivialtobeworthimplementing.SIST EN 300 766 V1.2.1:2004



ETSIETSIEN300766V1.2.1(2001-07)71ScopeThepresentdocumentspecifiesthetechnicalrequirementsandtestprinciplesfortheconnectioncharacteristicsandnetworkinterfacepresentationsofa64kbit/spoint-to-pointdigitalunrestrictedleasedlinewithoctetintegritythatisprovidedbetweeneither:-two2048kbit/sstructurednetworkinterfaces;or-a2048kbit/sstructurednetworkinterfaceanda64kbit/sco-directionalnetworkinterface.Morethanoneleasedlineofthetypedescribedinthepresentdocumentmaybeprovidedatany2048kbit/snetworkinterface.Suchleasedlinesmayconnecttothesameordifferentdestinations.Thepresentdocumentiswrittenasa"delta"documentbasedonthefollowingstandards:-EN300288:"AccessandTerminals(AT);64kbit/sdigitalunrestrictedleasedlinewithoctetintegrity(D64U);Networkinterfacepresentation".-EN300289:"AccessandTerminals(AT);64kbit/sdigitalunrestrictedleasedlinewithoctetintegrity(D64U);Connectioncharacteristics".-EN300418:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredandstructuredleasedlines(D2048UandD2048S);Networkinterfacepresentation".-EN300419:"AccessandTerminals(AT);2048kbit/sdigitalstructuredleasedlines(D2048S);Connectioncharacteristics".Thepresentdocumentisapplicabletoleasedlines,includingparttimeleasedlines,whoseestablishmentorreleasedoesnotrequireanyprotocolexchangeorotherinterventionattheNetworkTerminationPoint(NTP).Thepresentdocumentcoverstheconnectioncharacteristics,andthemechanicalandelectricalcharacteristics(exceptsafety,overvoltageandEMCaspects)ofthenetworkinterface,andspecifiesconformancetests.Someofthetestsfortheinterfacepresentationdescribedinthepresentdocumentarenotdesignedtobeappliedtotheinterfaceofaninstalledleasedline;suchtestsmaybeappliedtoequipmentofthekindusedtoprovidetheinterface.Thepresentdocumentdoesnotincludedetailsconcerningtheimplementationofthetestsnordoesitincludeinformationonanyregulationsconcerningtesting.NOTE:Thereisnorequirementforeachleasedlinetobetestedinaccordancewiththepresentdocumentbeforeitisbroughtinto,orreturnedinto,service.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.[1]ETSIEN300288:"AccessandTerminals(AT);64kbit/sdigitalunrestrictedleasedlinewithoctetintegrity(D64U);Networkinterfacepresentation".[2]ETSIEN300289:"AccessandTerminals(AT);64kbit/sdigitalunrestrictedleasedlinewithoctetintegrity(D64U);Connectioncharacteristics".[3]ETSIEN300418:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredandstructuredleasedlines(D2048UandD2048S);Networkinterfacepresentation".SIST EN 300 766 V1.2.1:2004



ETSIETSIEN300766V1.2.1(2001-07)8[4]ETSIEN300290:"AccessandTerminals(AT);64kbit/sdigitalunrestrictedleasedlinewithoctetintegrity(D64U)Terminalequipmentinterface".[5]ETSIEN300419:"AccessandTerminals(AT);2048kbit/sdigitalstructuredleasedlines(D2048S);Connectioncharacteristics".[6]ETSIEN300420:"AccessandTerminals(AT);2048kbit/sdigitalstructuredleasedlines(D2048S);Terminalequipmentinterface".[7]ITU-TRecommendationI.410(1988):"GeneralaspectsandprinciplesrelatingtoRecommendationsonISDNuser-networkinterfaces".[8]ITU-TRecommendationO.151(1992):"Errorperformancemeasuringequipmentoperatingattheprimaryrateandabove".[9]ITU-TRecommendationO.152(1992):"Errorperformancemeasuringequipmentforbitratesof64kbit/sandN×64kbit/s".3Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:erroredsecond:asecondwithoneormorebiterrorsframe:sequenceof256bitsofwhichthefirst8bitsdefinetheframestructureleasedlines:telecommunicationsfacilitiesprovidedbyapublictelecommunicationsnetworkthatprovidedefinedtransmissioncharacteristicsbetweennetworkterminationpointsandthatdonotincludeswitchingfunctionsthattheusercancontrol(e.g.on-demandswitching)NetworkTerminationPoint(NTP):allphysicalconnectionsandtheirtechnicalaccessspecificationswhichformpartofthepublictelecommunicationsnetworkandarenecessaryforaccesstoandefficientcommunicationthroughthatpublicnetworkoctetslip:slipofonecompleteoctetPRBS(215-1):PseudoRandomBitSequence(PRBS)asdefinedinclause2.1ofITU-TRecommendationO.151PRBS(211-1):PseudoRandomBitSequence(PRBS)asdefinedinclause2.1ofITU-TRecommendationO.152severelyerroredsecond:asecondwhereatleast0,1%ofthebitsareerroredslip:oneormoreextraormissingconsecutiveunitintervalsinthebitstreamtimeslot:inthecontextofthepresentdocument,atimeslotisaperiodofnominally3,90625µs(8bits).Eachframeofnominally125µsissubdividedinto32timeslotsnumbered0-31terminalequipment:equipmentintendedtobeconnectedtothepublictelecommunicationsnetwork,i.e.:-tobeconnecteddirectlytotheterminationofapublictelecommunicationnetwork;or-tointerworkwithapublictelecommunicationsnetworkbeingconnecteddirectlyorindirectlytotheterminationofapublictelecommunicationsnetwork,inordertosend,process,orreceiveinformation.SIST EN 300 766 V1.2.1:2004



ETSIETSIEN300766V1.2.1(2001-07)93.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:CRC-4CyclicRedundancyCheck(usingfourbits)D2048S2048kbit/sdigitalstructuredONPleasedlineD64MMultiple64kbit/sdigitalunrestrictedleasedlineswithoctetintegrityatastructured2048kbit/sinterfaceateitherorbothendsD64U64kbit/sdigitalunrestrictedONPleasedlinewithoctetintegrityEMCElectroMagneticCompatibilityNTPNetworkTerminationPointONPOpenNetworkProvisionPRBSPseudoRandomBitSequenceTETerminalEquipment4Overview(informative)Thepresentdocumentappliesto64kbit/sleasedlineswhereatleastoneendispresentedina2048kbit/sinterface.Thisincludesleasedlinesinawidevarietyofcasesandconfigurationssuchas:-anumberof64kbit/sleasedlinespresentedinasingle2048kbit/sinterfaceatonelocationbuteachconnectingtoadifferentlocation;-asingle64kbit/sleasedlinepresentedinasingle2048kbit/sinterfaceateachendwhereothertimeslotsintheinterfacesareusedforotherservices;-anumberof64kbit/sleasedlinesbetweenthesame2048kbit/sinterfaces.Inthiscasethereisnoguaranteethattheleasedlineswillfollowthesamerouteandhavethesametransmissiondelay,i.e.octetsofdatathatsharethesameframeattheinputwillnotnecessarilysharethesameframeattheoutput.Anexampleisshowninfigure1.2048kbit/sinterface2048kbit/sinterface64kbit/sinterface64kbit/sinterfaceNTPNTPNTPNTPFigure1SIST EN 300 766 V1.2.1:2004



ETSIETSIEN300766V1.2.1(2001-07)10Wherethereare64kbit/sleasedlinestodifferentdestinations,eachoftheleasedlinesispoint-to-point;thereisnobroadcastingorpoint-to-multipointcapability.Thepresentdocumenthasbeenwrittenasa"delta"documenttotheexistingstandardsfor64kbit/sand2048kbit/sleasedlines.Itusesrequirementsfromthesestandardsbycross-referencewithmodificationsasnecessarytothetest.Theconfigurationscoveredbythepresentdocumentcouldhavebeenaddressedbymodifyingtheexistingstandardsfor64kbit/sand2048kbit/sleasedlinestomakethemmoremodularsothatthe64kbit/sconnectioncharacteristicscouldbeusedinconjunctionwiththe2048kbit/sstructuredinterface.Insomewaysthiswouldhavebeenatidiersolution,butitwouldinvolveconsiderableadditionalactivitybecausetheexistingstandardsfor64kbit/sand2048kbit/sleasedlinesarecurrentlythesubjectofregulationandreferencestothemintheannexoftheONPleasedlineDirectivewouldhavetobechanged.5ConnectioncharacteristicsTheperformanceoftheleasedlineshallcomplywiththerequirementsofthisclause,onlyiftheconditionsofsupplyofthenetworkequipmentthatprovidestheNTParemet,(e.g.iftheequipmentisconnectedtoanappropriatepowersupplyonthecustomer'spremises).TheITU-Tattributetechniqueisusedtoexpresstheconnectionrequirements.ThefollowingattributesfromITU-TRecommendationI.140[7]areconsideredrelevantforthepresentdocument:-informationtransferrate;-informationtransfersusceptance;-structure;-establishmentofconnection;-symmetry;-networkperformance.NOTE:"Bitrate"isequivalentto"informationtransferrate"inthepresentdocument.Thefollowingnetworkperformancesub-attributesareconsideredrelevantforthepresentdocument:-transmissiondelay;-jitter;-octetslip;-error.SIST EN 300 766 V1.2.1:2004



ETSIETSIEN300766V1.2.1(2001-07)115.1SummaryofattributesTheconnectionattributesaredisplayedintable1.Ineffect,theseattributesdefinetheservicebeingoffered.Thevaluesandtheassociatedcompliancetestscanbefoundinthesubsequentclauses.Table1:ConnectionattributesConnectiontypeattributesValueDescriptionNatureReferenceclauseInformationtransferrate64kbit/sSee5.2InformationtransfersusceptanceUnrestricteddigitalSee5.3StructureSeparateoctetsSee5.4,6.2,7.2EstablishmentofconnectionWithoutuserinterventionSee5.4SymmetrySymmetricalinbothdirectionsSee5.5CommunicationconfigurationPoint-to-pointScopeand4Networkperformancesub-attributesValueDescriptionNatureReferenceclauseTransmissiondelayTerrestrialandsatelliteoptionsSee5.7JitterInputandoutputportsSee6.8,6.7,7.5,7.9Octetslip5per24hourperiodSee5.8ErrorparametersTimeintervalwitherroredblocksValueDescriptionNatureReferenceclauseErroredseconds5324per24hourperiodSee5.9Severelyerroredseconds105per24hourperiodSee5.105.2InformationtransferrateRequirement:Theconnectionshallbecapableoftransferringinformationatanominalinformationrateof64kbit/s.Test:ThetestshallbeconductedaccordingtoclauseA.2.5.3InformationtransfersusceptanceRequirement:Theleasedlineconnectionshallbecapableoftransferringunrestricteddigitalinformation.Test:ThetestshallbeconductedaccordingtoclauseA.2.5.4StructureandoctetintegrityWherethereisa2048kbit/sinterfaceateachendoftheleasedline,itisnotarequirementthattheleasedlineshallbepresentedinthesametimeslotateachinterface.Requirement:Foreachdirectionoftransmission,theleasedlineshallconveyeachoctetofinformationfromitsinputbitstream,orinthecaseofa2048kbit/sinterfaceattheinput,eachoctetofinformationinthetimeslotassignedtotheleasedline,andpresenteachoctetasasingleandcompleteoctetinthesameorderattheoutput.Inthecasewherethereisa2048kbit/sinterfaceattheleasedlineoutput,thisoctetshallbewhollycontainedinasingletimeslot.Wherethereisa2048kbit/sinterfaceatoneendoftheleasedlineanda64kbit/sinterfaceattheotherend,foreachdirectionoftransmission,thebitatthestart(i.e.closesttothelowernumberedtimeslot)ofthetimeslotassignedtotheleasedlineatofthe2048kbit/sinterfaceshallcorrespondtothebitatthestartofeachoctetinthe64kbit/sinterface.TheorderofthebitswithineachoctetandtheorderofoctetsshallbemaintainedSIST EN 300 766 V1.2.1:2004



ETSIETSIEN300766V1.2.1(2001-07)12NOTE:Thisrequirementisillustratedinfigure2.Timeslotxisassignedtotheleasedlineattheinput.Timeslotyisassignedtotheleasedlineattheoutputwheretheoutputusesa2048kbit/sinterface.Theoctetofbitscontainedintimeslotxisrequiredtobetransmittedwhollywithintimeslotyattheoutput,andnottooverlapintoothertimeslotsortimeslotsinotherframes.Ata64kbit/soutputtheoctetisrequiredtobewhollycontainedbetween"octettimingmarks"(forclarificationseeEN300288[1]).Withineachoctet,theorderofthebitsisrequiredtobemaintained(thisiscalledbitsequenceintegrity).Theorderoftheoctetsisrequiredtobemaintained(thisiscalledoctetsequenceintegrity).Frameof2048kbit/sinputFrameof2048kbit/soutput031xxFrameof64kbit/soutputyyFigure2Test:ThetestshallbeconductedaccordingtoclauseA.2.5.5EstablishmentofconnectionRequirement:EstablishmentorreleaseoftheleasedlineconnectionshallnotrequireanyprotocolexchangeorotherinterventionattheNTPbytheuser.Test:Byvisualinspection.5.6SymmetryRequirement:Theconnectionshallbesymmetrical,i.e.eachdirectionoftransmissionshallhavethesameinformationtransfercapability.Test:ThetestshallbeconductedaccordingtoclauseA.2.5.7TransmissiondelayRequirement:Theleasedlineconnectionshallmeettherequirementstatedinclause5.1.7.1ofEN300289[2].Test:ThetestshallbeconductedaccordingtoclauseA.2.2ofEN300289[2].SIST EN 300 766 V1.2.1:2004



ETSIETSIEN300766V1.2.1(2001-07)135.8ControlledslipRequirement:Theleasedlineconnectionshallmeettherequirementsstatedinclause5.1.7.3ofEN300289[2].Test:ThetestshallbeconductedaccordingtoclauseA.2.4ofEN300289[2]withthefollowingmodification.Wheretheleasedlineispresentedata2048kbit/sinterface:-thestimulusshallbeanHDB3encodedbitstreamcomplyingwithawaveformshapeasdefinedinEN300418[3],structuredaccordingtoannexBofEN300419[5],containingaPRBS(211-1)inthetimeslotassignedtotheleasedline;-thesignalmonitoredshallbethesignalinthetimeslotassignedtotheleasedline.5.9ErroredsecondsRequirement:Theleasedlineconnectionshallmeettherequirementsstatedinclause5.1.7.4.1ofEN300289[2].NOTE:Whenmicrowavelinksareusedintheconnections,itmaynotbepossibletomeettherequirementinrareperiodswithveryadversepropagationconditions.Test:ThetestshallbeconductedaccordingtoclauseA.2.4ofEN300289[2]withthefollowingmodification.Wheretheleasedlineispresentedata2048kbit/sinterface:-thestimulusshallbeanHDB3encodedbitstreamcomplyingwithawaveformshapeasdefinedinEN300418[3],structuredaccordingtoannexBofEN300419[5],containi
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