SIST EN 300 248 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 2 048 kbit/s in za nestrukturirane signale (D2048U) - Vmesnik terminalske opremeAccess and Terminals (AT); 2 048 kbit/s digital unstructured leased line (D2048U); Terminal equipment interface33.040.50Vodi, zveze in tokokrogiLines, connections and circuitsICS:Ta slovenski standard je istoveten z:EN 300 248 Version 1.2.1SIST EN 300 248 V1.2.1:2004en01-oktober-2004SIST EN 300 248 V1.2.1:2004SLOVENSKI

ETSIEN300248V1.2.1(2001-07)EuropeanStandard(Telecommunicationsseries)AccessandTerminals(AT);2048kbit/sdigitalunstructuredleasedline(D2048U);TerminalequipmentinterfaceSIST EN 300 248 V1.2.1:2004

ETSIETSIEN300248V1.2.1(2001-07)2ReferenceREN/AT-020003Keywordsaccess,digital,leasedline,ONP,regulation,terminal,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 300 248 V1.2.1:2004

ETSIETSIEN300248V1.2.1(2001-07)3ContentsIntellectualPropertyRights..........................................................................................................................5Foreword......................................................................................................................................................5Introduction..................................................................................................................................................61Scope..................................................................................................................................................72References..........................................................................................................................................73Definitions..........................................................................................................................................74Abbreviations.....................................................................................................................................85Requirements......................................................................................................................................85.1Physicalcharacteristics................................................................................................................................85.1.1Hardwiredconnection............................................................................................................................95.1.2Alternativemeansofconnection.............................................................................................................95.2Electricalcharacteristics..............................................................................................................................95.2.1Outputport............................................................................................................................................95.2.1.1Signalcoding....................................................................................................................................95.2.1.2Waveformshape...............................................................................................................................95.2.1.3Clockaccuracy...............................................................................................................................105.2.1.4Impedancetowardsground.............................................................................................................115.2.1.5Outputjitter....................................................................................................................................115.2.1.6Outputreturnloss...........................................................................................................................115.2.1.7Outputsignalbalance......................................................................................................................115.2.2Inputport.............................................................................................................................................115.2.2.1Signalcoding..................................................................................................................................115.2.2.2Inputreturnloss..............................................................................................................................125.2.2.3Inputlosstolerance.........................................................................................................................125.2.2.4Immunityagainstreflections...........................................................................................................125.2.2.5Tolerablelongitudinalvoltages.......................................................................................................125.2.2.6Impedancetowardsground.............................................................................................................125.2.2.7Inputjittertolerance........................................................................................................................135.2.2.8Inputclocktolerance.......................................................................................................................135.3Safety........................................................................................................................................................145.4Overvoltage...............................................................................................................................................145.5Electro-magneticcompatibility..................................................................................................................14AnnexA(normative):Testmethods..............................................................................................15A.1General.............................................................................................................................................15A.1.1Additionalinformationtosupportthetest..................................................................................................15A.1.2Equipmentconnection...............................................................................................................................15A.2Testmethods....................................................................................................................................16A.2.1Signalcodingatoutputport.......................................................................................................................16A.2.2Waveformshapeatoutputport..................................................................................................................16A.2.3Clockaccuracyattheoutputport...............................................................................................................17A.2.4Returnlossatinputport.............................................................................................................................18A.2.5Inputlosstoleranceandimmunityagainstreflections.................................................................................18A.2.6TolerablelongitudinalvoltageandHDB3inputcoding..............................................................................20A.2.7Impedancetowardsground........................................................................................................................21A.2.8Jitter..........................................................................................................................................................22AnnexB(normative):DefinitionofHDB3code............................................................................24B.1General.............................................................................................................................................24B.2Definition.........................................................................................................................................24SIST EN 300 248 V1.2.1:2004

ETSIETSIEN300248V1.2.1(2001-07)4AnnexC(informative):Bibliography...............................................................................................25History.......................................................................................................................................................26SIST EN 300 248 V1.2.1:2004

ETSIETSIEN300248V1.2.1(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).ThepresentdocumentresultsfromamandatefromtheEuropeanCommissiontoprovideEuropeanstandardsforthesupportoftheDirectiveonOpenNetworkProvision(ONP)ofleasedlines(92/44/EEC).Therearetwootherstandardsdirectlyrelatedtothepresentdocument:-EN300418:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredandstructuredleasedlines(D2048UandD2048S);Networkinterfacepresentation";-EN300247:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredleaseline(D2048U);Connectioncharacteristics".ThepresentdocumentisbasedoninformationfromITU-TRecommendationsandETSIpublicationsandtherelevantdocumentsarequotedwhereappropriate.NationaltranspositiondatesDateofadoptionofthisEN:29June2001DateoflatestannouncementofthisEN(doa):30September2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31March2002DateofwithdrawalofanyconflictingNationalStandard(dow):31March2002SIST EN 300 248 V1.2.1:2004

ETSIETSIEN300248V1.2.1(2001-07)6IntroductionTheCouncilDirectiveontheapplicationofOpenNetworkProvision(ONP)toleasedlines(92/44/EEC),concernstheharmonizationofconditionsforopenandefficientaccessto,anduseof,theleasedlinesprovidedonpublictelecommunicationsnetworksandtheavailabilitythroughouttheCommunity(EC)ofaminimumsetofleasedlineswithharmonizedtechnicalcharacteristics.TheconsequenceoftheDirectiveisthatTelecommunicationsOrganizationswithintheECshallmakeavailableasetofleasedlinesbetweenpointsinthesecountrieswithspecifiedconnectioncharacteristicsandspecifiedinterfaces.EN300166andITU-TRecommendationG.703[1]wereusedasthebasisfortheterminalinterface.Twocategories(voluntaryandregulatory)ofstandardwereusedfortheinterfacesofterminalequipmentdesignedforconnectiontotheONPleasedlines.TechnicalBasisforRegulations(TBRs)gavetheearlieressentialrequirementsundertheDirective91/263/EEC,laterreplacedby98/13/EC,forattachmenttotheleasedlines,whereasothervoluntarystandards(ETSsorENs)gavethefulltechnicalspecificationsfortheseinterfaces.Thisdocument,whichisbasedonanearlierETS,belongstothesecondcategory.TherequirementsofTBR12areasubsetofthepresentdocument.Thepresentversionofthepresentdocumenthasbeenproducedtointroducesomenecessarychanges.SIST EN 300 248 V1.2.1:2004

ETSIETSIEN300248V1.2.1(2001-07)71ScopeThepresentdocumentspecifiesthephysicalandelectricalcharacteristics(exceptsafety,overvoltageandEMCaspects)andcorrespondingtestprinciplesforaterminalequipmentinterfaceforconnectiontothenetworkterminationpointsofONP2048kbit/sdigitalunstructuredleasedlinesusing120Ωinterfaces.ThepresentdocumentistoensurethattheinterfaceoftheterminalequipmentiscompatiblewiththeONP2048kbit/sdigitalunstructuredleasedline.Itisapplicabletoallinterfacesdesignedforconnectiontotheleasedline,howeverinthecasesofapparatusthatcarriesaparticularservice,ofcomplexapparatusandofapparatusinprivatenetworks,otherrequirementsmayapplyinadditiontothepresentdocument.CustomerpremiseswiringandinstallationbetweentheterminalequipmentandtheNetworkTerminationPoint(NTP)areoutsidethescopeofthepresentdocument.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.[1]ITU-TRecommendationG.703(1998):"Physical/electricalcharacteristicsofhierarchicaldigitalinterfaces".[2]ITU-TRecommendationO.151(1992):"Errorperformancemeasuringequipmentoperatingattheprimaryrateandabove".3DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:Leasedlines:telecommunicationsfacilitiesprovidedbyapublictelecommunicationsnetworkthatprovidedefinedtransmissioncharacteristicsbetweennetworkterminationpointsandthatdonotincludeswitchingfunctionsthattheusercancontrol,(e.g.on-demandswitching)NetworkTerminationPoint(NTP):allphysicalconnectionsandtheirtechnicalaccessspecificationswhichformpartofthepublictelecommunicationsnetworkandarenecessaryforaccessto,andefficientcommunicationthrough,thatpublicnetworkTerminalEquipment(TE):equipmentintendedtobeconnectedtothepublictelecommunicationsnetwork,i.e.:a)tobeconnecteddirectlytotheterminationofapublictelecommunicationsnetwork;orb)tointerworkwithapublictelecommunicationsnetworkbeingconnecteddirectlyorindirectlytotheterminationofapublictelecommunicationsnetwork,inordertosend,process,orreceiveinformation.SIST EN 300 248 V1.2.1:2004

ETSIETSIEN300248V1.2.1(2001-07)84AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:D2048U2048kbit/sdigitalunstructuredONPleasedlineDCDirectCurrentEMCElectro-MagneticCompatibilityHDB3HighDensityBipolarcodeoforder3(seeannexB)NTPNetworkTerminationPointONPOpenNetworkProvisionppmpartspermillionPRBS(215-1)PseudoRandomBitSequence(asdefinedinclause2.1ofITU-TRecommendationO.151[2])rmsrootmeansquareRXReceive(asignalinputateithertheterminalequipmentinterfaceorthetestequipment)SDHSynchronousDigitalHierarchyTETerminalEquipmentTXTransmit(asignaloutputateithertheterminalequipmentinterfaceorthetestequipment)UIUnitInterval5RequirementsThe2048kbit/sunstructuredleasedlineprovidesabidirectionalpoint-to-pointdigitalleasedlinewithausablebitrateof2048kbit/swheretimingisnotprovidedfromthenetwork.Theprovisionofcircuittimingistheresponsibilityoftheuser.Nostructuringofthedataisprovidedbythenetworkandanystructuringistheresponsibilityoftheuser.5.1PhysicalcharacteristicsCurrentlynostandardizedconnectorisreadilyavailable.Consequently,theonlymethodofconnectionthatcanbespecifiedinthepresentdocumentistheuseofsolidconductorsof0,4mmto0,6mm.ThepresentdocumentrequirestheTEtobecapableofpresentingeitherapointfortheattachmentofunterminatedsolidconductors,orsolidconductorsthemselves(seeclause5.1.1).ItisarequirementthatsuchaconnectionmethodbeavailabletobeprovidedforusewiththeTEifnecessary.Inordertoallowconnectiontobemadeusingothermethods(e.g.connectors),theTEispermittedtobesuppliedwithaconnectionmethodsuitableforusewiththosemethods(seeclause5.1.2).NOTE1:Thefollowingareexamplesofarrangementsthatcomplywiththerequirements.Thelistbelowshouldnotberegardedasanexhaustivelistofallpermittedarrangements:a)acord,permanentlyconnectedtotheterminalequipmentatoneendandunterminatedattheotherend,withwiresthataresolidconductorswithdiametersintherange0,4mmto0,6mm;b)acord,connectedviaaplugandsockettotheterminalequipmentatoneendandunterminatedattheotherend,withwiresthataresolidconductorswithdiametersintherange0,4mmto0,6mm;c)aninsulationdisplacementconnector,designedtoacceptwireswithsolidconductorswithdiametersintherange0,4mmto0,6mm,butwithnocord;d)ascrewconnector,designedtoacceptwireswithsolidconductorswithdiametersintherange0,4mmto0,6mm,butwithnocord;e)thearrangementinb)plusoneormoreadditionalalternativecordswiththesameplugorsocketarrangementattheterminalendandanyplugorsocketattheotherend;f)thearrangementinc)ord)plusoneormorecordssuitableforconnectiontotheterminalequipmentatoneendandanyplugorsocketattheotherend.Thetransmitpairistheoutputfromtheterminalequipmentinterface.Thereceivepairistheinputtotheterminalequipmentinterface,asshowninfigure1.Wheretheterms"output"and"input"areusedwithoutqualificationinthepresentdocument,theyrefertotheterminalequipmentinterface.SIST EN 300 248 V1.2.1:2004

ETSIETSIEN300248V1.2.1(2001-07)9Figure1NOTE2:TheuseofashieldedcordorcablemaybenecessarytomeetradiationandimmunityrequirementsdefinedinElectroMagneticCompatibility(EMC)standards.5.1.1HardwiredconnectionRequirement:Theterminalequipmentshallprovide:a)asetofconnectioncontacts(e.g.aninsulationdisplacementconnectororascrewterminalblock)towhichsolidwireconductorswithdiametersintherange0,4mmto0,6mmmaybeconnected;orb)awiringarrangementconnectedbyanymeanstotheterminalequipment,withunterminatedsolidwireconductorswithdiametersintherange0,4mmto0,6mmattheenddistantfromtheterminalequipment.Test:Thereisnotest.Allsubsequenttestsarecarriedoutviathespecifiedconnectionmethod.5.1.2AlternativemeansofconnectionAnyalternativemeansofconnectionmaybeprovidedinadditiontotheconnectionarrangementsunderclause5.1.1.5.2Electricalcharacteristics5.2.1Outputport5.2.1.1SignalcodingRequirement:CodingofthedigitalsignaltransmittedattheoutputportshallbeinaccordancewithHighDensityBipolarcodeoforder3(HDB3)encodingrules(seeannexB).Test:ThetestshallbeconductedaccordingtoannexA,clauseA.2.1.5.2.1.2WaveformshapeRequirement:Thepulseattheoutputportshallcomplywiththerequirementsgivenintable1andfigure2,basedonITU-TRecommendationG.703[1].Test:ThetestshallbeconductedaccordingtoannexA,clauseA.2.2.Table1:WaveformshapeatoutputportPulseshape(nominallyrectangular)Allmarksofavalidsignalshallconformwiththemask(seefigure2)irrespectiveofthepolarity.ThevalueVcorrespondstothenominalpeakvoltageofamark.Testloadimpedance120Ω non-reactiveNominalpeakvoltageVofamark3VPeakvoltageofaspace0±0,3VNominalpulsewidth244nsRatiooftheamplitudesofpositiveandnegativepulsesatthecentreofthepulseinterval0,95to1,05Ratioofthewidthsofpositiveandnegativepulsesatthenominalhalfamplitude0,95to1,05INPUTINPUTOUTPUTOUTPUTTXNETWORKINTERFACETXTERMINALEQUIPMENTSIST EN 300 248 V1.2.1:2004

ETSIETSIEN300248V1.2.1(2001-07)10269ns194ns(244-50)=100%50%0%10%10%10%10%20%244ns219ns(244-25)488ns(244+244)Nominalpulse20%20%10%10%(244+25)Figure2:Pulsemaskfor2048kbit/spulse5.2.1.3ClockaccuracyRequirement:WhereaTerminalEquipment(TE)hasaninternalclock,intheabsenceofanyexternalreferencesignaltiming,theoutputportshallhaveabitrateof2048kbit/s±50ppm.Test:ThetestshallbeconductedaccordingtoannexA,clauseA.2.3.SIST EN 300 248 V1.2.1:2004

ETSIETSIEN300248V1.2.1(2001-07)115.2.1.4ImpedancetowardsgroundRequirement:Wheretheterminalequipmenthasaground,theimpedancetowardsgroundoftheoutputportshallbegreaterthan1000Ωforfrequenciesintherange10Hzto1MHzwhenmeasuredwithasinusoidaltestvoltageof2Vrms.Forthepurposeofthisrequirement,groundshallbetheterminalequipm