SIST EN 300 248 V1.2.1:2004

Access and Terminals (AT); 2 048 kbit/s digital unstructured leased line (D2048U); Terminal equipment interface

Revision to improve the safety related text following a liaison from TC Safety. Access for any apparatus intended for connection to leased circuit.

Dostop in terminali (AT) - Digitalni zakupljeni vodi za prenosno hitrost 2 048 kbit/s in za nestrukturirane signale (D2048U) - Vmesnik terminalske opreme

General Information

• Status: Published
• Publication Date: 30-Sep-2004
• ICS: 33.040.50 - Lines, connections and circuits
• Technical Committee: SPN - Services and Protocols for Networks
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Oct-2004
• Due Date: 01-Oct-2004
• Completion Date: 01-Oct-2004
• Mandate: T-147-2
• Ref Project: ETSI EN 300 248 V1.2.1 (2001-07) - Access and Terminals (AT); 2 048 kbit/s digital unstructured leased line (D2048U); Terminal equipment interface

Standards Content (Sample)

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
STANDARD



SIST EN 300 248 V1.2.1:2004



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.:[phone]Fax:[phone]SiretN°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:[e-mail]opartmaybereproducedexceptasauthorizedbywrittenpermission.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
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