SIST EN 300 686 V1.2.1:2004

• Abstract:

  Revision to improve safety related text following a liaison from TC Safety. Specification of the public network interface and test methods for compliance.

• 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-297
• Ref Project: ETSI EN 300 686 V1.2.1 (2001-07) - Access and Terminals (AT); 34 Mbit/s and 140 Mbit/s digital leased lines (D34U, D34S, D140U, D140S); Network interface presentation

SIST EN 300 686 V1.2.1:2004 is the SIST adoption of ETSI EN 300 686 V1.2.1 for the network interface presentation of 34 Mbit/s and 140 Mbit/s digital leased lines. It specifies the public network interface for D34U, D34S, D140U and D140S lines, including the mechanical and electrical characteristics at the Network Termination Point (NTP) and the conformance tests used to check them.

What does SIST EN 300 686 V1.2.1:2004 specify?

SIST EN 300 686 V1.2.1:2004 specifies the technical requirements and compliance tests for the network interface presentation of 34 Mbit/s and 140 Mbit/s digital leased lines. The standard covers both unstructured and structured services, and it is used together with the matching connection-characteristics standard for the relevant bit rate.

The scope includes:

• D34U and D140U unstructured leased lines
• D34S and D140S structured leased lines
• interfaces presented by the leased line provider at the NTP
• mechanical and electrical characteristics of the interface
• conformance testing for equipment that provides the interface presentation

The standard excludes safety, overvoltage and EMC aspects from its technical requirements. It is organized into clauses for scope, references, definitions and abbreviations, and requirements, followed by normative annexes for test methods and code definitions.

Annex	What it covers
Annex A	Test methods for conformance checking
Annex B	Definition of HDB3 code
Annex C	Definition of CMI code
Annex D	Bibliography

What are the key requirements of SIST EN 300 686 V1.2.1:2004?

SIST EN 300 686 V1.2.1:2004 defines the interface as a 75 ohm coaxial transmit pair and receive pair at the NTP. In practice, this means the provider side interface has to match the specified socket types and grounding arrangement so that customer equipment can connect predictably and safely from an interface point of view.

Mechanical interface

Clause 4.1 requires two coaxial 75 ohm sockets, one for transmit and one for receive, using either IEC 60169-13 type 1,6/5,6 sockets or BNC sockets to IEC 60169-8 with the mating dimensions from ISO/IEC 10173. The outer conductor is connected to signal ground at both ports, which matters because ground differences can damage connected equipment.

34 Mbit/s electrical characteristics

Clause 4.2 requires HDB3 signalling at the output port, with the pulse shape, return loss and timing behavior defined for the 34 Mbit/s interface. The input port must decode HDB3 correctly, tolerate specified cable loss and reflections, and accept the defined return-loss conditions, so equipment can operate over the expected interface path without bit errors.

140 Mbit/s electrical characteristics

Clause 4.3 requires CMI signalling at the output port, with pulse-mask and return-loss requirements tailored to the 140 Mbit/s interface. The input port must decode CMI correctly and tolerate the specified cable attenuation and impedance range, which is what keeps the higher-rate interface interoperable across compliant equipment.

Timing and service behavior

For both bit rates, the standard states that timing is the user’s responsibility, although the provider may offer a synchronized service in some installations. It also sets output timing under failure conditions, so implementers know what bitrate behavior is expected if the network enters a fault state.

Test application

Clause 4 and Annex A make the compliance tests part of the interface definition. Some tests are intended for the equipment that provides the interface rather than for an installed leased line, which matters when you are choosing whether to test in the lab, at acceptance, or at the live NTP.

What terms does SIST EN 300 686 V1.2.1:2004 define?

• Leased lines - Telecommunications facilities provided by a public network with defined transmission characteristics between NTPs and without user-controlled switching.
• Network Termination Point (NTP) - The physical connection point in the public network where compliance is assessed and access is provided.
• Pseudo-Random Bit Sequence (PRBS) - A defined bit pattern, here PRBS(223-1), used for coding and tolerance tests.
• High Density Bipolar code 3 (HDB3) - A modified AMI code used for the 34 Mbit/s interface.
• Coded Mark Inversion (CMI) - The line code used for the 140 Mbit/s interface.
• TX / RX - TX is the signal output and RX is the signal input at the leased line interface or test equipment.

Who uses SIST EN 300 686 V1.2.1:2004?

SIST EN 300 686 V1.2.1:2004 is used by leased line providers, network operators, terminal equipment manufacturers, and test laboratories. It is relevant to engineers who design the interface, quality teams who verify conformance, and buyers who need compatible 34 Mbit/s or 140 Mbit/s leased line equipment. Installers and acceptance test teams also use it when checking that a provider interface matches the required presentation.

What changed in SIST EN 300 686 V1.2.1:2004 from the previous edition?

The July 2001 version introduces necessary changes and revises safety-related text following liaison from TC Safety. The foreword says the standard was produced to support harmonized leased-line requirements and that the interface presentation requirements are based on ETS 300 166 and ITU-T Recommendation G.703.

Which standards are used with SIST EN 300 686 V1.2.1:2004?

SIST EN 300 686 V1.2.1:2004 refers to these companion documents and references:

• IEC 60169-8 - defines one acceptable BNC socket type.
• IEC 60169-13 - defines one acceptable 75 ohm socket type.
• ISO/IEC 10173 - gives the mating dimensions for the BNC option.
• ITU-T Recommendation G.703 - provides the electrical and waveform basis for the interface.
• ITU-T Recommendation O.151 - supports the PRBS definition used in testing.
• ETSI EN 300 687 - gives connection characteristics for 34 Mbit/s leased lines.
• ETSI EN 300 688 - gives connection characteristics for 140 Mbit/s leased lines.
• ETSI EN 300 689 - defines the 34 Mbit/s terminal equipment interface.
• ETSI EN 300 690 - defines the 140 Mbit/s terminal equipment interface.

What does the SIST EN 300 686 V1.2.1:2004 document contain?

SIST EN 300 686 V1.2.1:2004 contains the mechanical interface requirements, the 34 Mbit/s and 140 Mbit/s electrical characteristics, and the associated compliance test methods. Annex A gives test setups for coding, waveform shape, failure-condition timing, loss tolerance, reflections, and return loss. Annex B and Annex C define the HDB3 and CMI line codes used by the interface. The figures, pulse masks, bridge measurements and cable-simulator setups support design verification and conformance testing of interface equipment.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Dostop in terminali (AT) - Digitalni zakupljeni vodi za prenosni hitrosti 34 Mbit/s in 140 Mbit/s (D34U, D34S, D140U, D140S) - Omrežni vmesnikAccess and Terminals (AT); 34 Mbit/s and 140 Mbit/s digital leased lines (D34U, D34S, D140U, D140S); Network interface presentation33.040.50Vodi, zveze in tokokrogiLines, connections and circuitsICS:Ta slovenski standard je istoveten z:EN 300 686 Version 1.2.1SIST EN 300 686 V1.2.1:2004en01-oktober-2004SIST EN 300 686 V1.2.1:2004SLOVENSKI
STANDARD
ETSIEN300686V1.2.1(2001-07)EuropeanStandard(Telecommunicationsseries)AccessandTerminals(AT);34Mbit/sand140Mbit/sdigitalleasedlines(D34U,D34S,D140U,D140S);NetworkinterfacepresentationSIST EN 300 686 V1.2.1:2004

ETSIETSIEN300686V1.2.1(2001-07)2ReferenceREN/AT-020008Keywordsinterface,leasedline,networkETSI650RoutedesLuciolesF-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 300 686 V1.2.1:2004

ETSIETSIEN300686V1.2.1(2001-07)3ContentsIntellectualPropertyRights.5Foreword.5Introduction.61Scope.72References.73Definitionsandabbreviations.83.1Definitions.83.2Abbreviations.84Requirements.94.1Mechanicalcharacteristics.94.2Electricalcharacteristics-34Mbit/s.104.2.1Outputport.104.2.1.1Signalcodingattheoutputport.104.2.1.2Waveformshape.104.2.1.3Outputtimingunderfailureconditions.114.2.1.4Outputreturnloss.114.2.1.5Outputtimingandjitter.114.2.2Inputport.124.2.2.1Signalcodingattheinputport.124.2.2.2Inputreturnloss.124.2.2.3Inputlosstolerance.124.2.2.4Immunityagainstreflections.124.2.2.5Inputtimingandjittertolerance.124.3Electricalcharacteristics-140Mbit/s.134.3.1Outputport.134.3.1.1Signalcodingattheoutputport.134.3.1.2Waveformshape.134.3.1.3Outputtimingunderfailureconditions.154.3.1.4Outputreturnloss.154.3.1.5Outputtimingandjitter.164.3.2Inputport.164.3.2.1Signalcodingattheinputport.164.3.2.2Inputreturnloss.164.3.2.3Inputlosstolerance.164.3.2.4Inputtimingandjittertolerance.164.4Safety.164.5Overvoltage.164.6ElectroMagneticCompatibility(EMC).17AnnexA(normative):Testmethods.18A.1General.18A.1.1Additionalinformationtosupportthetest.18A.1.2Equipmentconnection.18A.2Testmethods.19A.2.1Signalcodingattheoutputport.19A.2.1.1Signalcodingattheoutputport-34Mbit/s.19A.2.1.2Signalcodingattheoutputport-140Mbit/s.20A.2.2Waveformshapeattheoutputport.20A.2.2.1Waveformshapeattheoutputport-34Mbit/s.20A.2.2.2Waveformshapeattheoutputport-140Mbit/s.21A.2.3Outputtimingunderfailureconditions.22A.2.4Inputsignalcoding,losstoleranceandimmunityagainstreflections.23SIST EN 300 686 V1.2.1:2004

ETSIETSIEN300686V1.2.1(2001-07)4A.2.4.1Inputsignalcoding,losstoleranceandimmunityagainstreflections-34Mbit/s.23A.2.4.2Inputsignalcodingandlosstolerance-140Mbit/s.24A.2.5Inputreturnloss.25A.2.6Outputreturnloss.26AnnexB(normative):DefinitionofHDB3code.27B.1General.27B.2Definition.27AnnexC(normative):DefinitionofCMIcode.28C.1General.28C.2Definition.28AnnexD(informative):Bibliography.29History.30SIST EN 300 686 V1.2.1:2004

ETSIETSIEN300686V1.2.1(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).Therearefourotherstandardsdirectlyrelatedtothepresentdocument:-EN300687:"AccessandTerminals(AT);34Mbit/sdigitalleasedlines(D34UandD34S);Connectioncharacteristics";-EN300688:"AccessandTerminals(AT);140Mbit/sdigitalleasedlines(D140UandD140S);Connectioncharacteristics";-EN300689:"AccessandTerminals(AT);34Mbit/sdigitalleasedlines(D34UandD34S);Terminalequipmentinterface";-EN300690:"AccessandTerminals(AT);140Mbit/sdigitalleasedlines(D140UandD140S);Terminalequipmentinterface".ThepresentdocumentisbasedoninformationfromITU-TRecommendationsandETSIpublicationsandtherelevantdocumentsarequotedwhereappropriate.NationaltranspositiondatesDateofadoptionofthisEN:29June2001DateoflatestannouncementofthisEN(doa):30September2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31March2002DateofwithdrawalofanyconflictingNationalStandard(dow):31March2002SIST EN 300 686 V1.2.1:2004

ETSIETSIEN300686V1.2.1(2001-07)6IntroductionTheCouncilDirectiveontheapplicationofOpenNetworkProvision(ONP)toleasedlines(92/44/EEC)(seeannexD)concernstheharmonizationofconditionsforopenandefficientaccessto,anduseof,theleasedlinesprovidedoverpublictelecommunicationsnetworks,andtheavailabilitythroughouttheEuropeanUnionofaminimumsetofleasedlineswithharmonizedtechnicalcharacteristics.The34Mbit/sand140Mbit/sunstructuredandstructuredleasedlinesarenotpartoftheminimumsetofleasedlinesundertheleasedlineDirective,howeverthesestandardsarebeingwrittenwiththeintentionthatwhere34Mbit/sor140Mbit/sleasedlinesareoffered,theywillbeinaccordancewiththeseharmonizedstandards.UndertheDirective91/263/EEC(seeannexD),laterreplacedby98/13/EC(seeannexD),terminalequipmentforconnectiontotheseleasedlineswasrequiredtofulfilcertainessentialrequirements.Thepresentversionofthepresentdocumenthasbeenproducedtointroducesomenecessarychanges.ETS300166(seeannexD)andITU-TRecommendationG.703[4]wereusedasthebasisfortheinterfacepresentationrequirements.SIST EN 300 686 V1.2.1:2004

ETSIETSIEN300686V1.2.1(2001-07)71ScopeThepresentdocumentspecifiesthetechnicalrequirementsandconformancetestsforthenetworkinterfacepresentationsof34Mbit/sand140Mbit/sdigitalleasedlines.Thisincludes:-the34Mbit/sDigitalUnstructuredleasedlineoperatingat34368kbit/s;-the140Mbit/sDigitalUnstructuredleasedlineoperatingat139264kbit/s;-the34Mbit/sdigitalstructuredleasedlineoperatingat34368kbit/sforthesupportofanunstructured33920kbit/sinformationtransferrate;-the140Mbit/sdigitalstructuredleasedlineoperatingat139264kbit/sforthesupportofanunstructured138240kbit/sinformationtransferrate.AconnectionispresentedviainterfacesatNetworkTerminationPoints(NTPs).Thepresentdocumentdefinesthenetworkinterfaceaspresentedbytheleasedlineproviderandshouldbeusedinconjunctionwiththeappropriatecompanionstandard,EN300687[6](34Mbit/s)orEN300688[7](140Mbit/s),whichspecifiestheconnectioncharacteristicsbetweenNTPsoftheleasedline.Thepresentdocumentandtheappropriateconnectioncharacteristicsstandardtogetherdescribethetechnicalcharacteristicsoftherelevantleasedline.Thepresentdocumentisapplicabletoleasedlines,includingparttimeleasedlines,whoseestablishmentorreleasedoesnotrequireanyprotocolexchangeorotherinterventionattheNTP.Thepresentdocumentcoversthemechanicalandelectricalcharacteristics(exceptsafety,overvoltageandEMCaspects)ofthenetworkinterfaceandspecifiestheconformancetestsforequipmentofthekindthatprovidestheinterfacepresentation.Someofthetestsdescribedinthepresentdocumentarenotdesignedtobeappliedtotheinterfaceofaninstalledleasedline;suchtestsmaybeappliedtoequipmentofthekindusedtoprovidetheinterface.Thepresentdocumentdoesnotincludedetailsconcerningtheimplementationofthetestsnordoesitincludeinformationonanyregulationsconcerningtesting.Thereisnorequirementforeachleasedlinetobetestedinaccordancewiththepresentdocumentbeforeitisbroughtintoserviceorreturnedintoservicefollowingrepair.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".SIST EN 300 686 V1.2.1:2004

ETSIETSIEN300686V1.2.1(2001-07)8[5]ITU-TRecommendationO.151(1992):"Errorperformancemeasuringequipmentoperatingattheprimaryrateandabove".[6]ETSIEN300687:"AccessandTerminals(AT);34Mbit/sdigitalleasedlines(D34UandD34S);Connectioncharacteristics".[7]ETSIEN300688:"AccessandTerminals(AT);140Mbit/sdigitalleasedlines(D140UandD140S);Connectioncharacteristics".[8]ETSIEN300689:"AccessandTerminals(AT);34Mbit/sdigitalleasedlines(D34UandD34S);Terminalequipmentinterface".[9]ETSIEN300690:"AccessandTerminals(AT);140Mbit/sdigitalleasedlines(D140UandD140S);Terminalequipmentinterface".3Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:leasedlines:telecommunicationsfacilitiesprovidedbyapublictelecommunicationsnetworkthatprovidedefinedtransmissioncharacteristicsbetweennetworkterminationpointsandthatdonotincludeswitchingfunctionsthattheusercancontrol,(e.g.on-demandswitching)NetworkTerminationPoint(NTP):allphysicalconnectionsandtheirtechnicalaccessspecificationswhichformpartofthepublictelecommunicationsnetworkandarenecessaryforaccesstoandefficientcommunicationthroughthatpublicnetworkPRBS(223-1):PseudoRandomBitSequence(PRBS)(asdefinedinclause2.2ofITU-TRecommendationO.151[5])3.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:acalternatingcurrentAMIAlternateMarkInversionBNCBayonetNutConnectorCMICodedMarkInversionD140S140Mbit/sDigitalStructuredleasedlineD140U140Mbit/sDigitalUnstructuredleasedlineD34S34Mbit/sDigitalStructuredleasedlineD34U34Mbit/sDigitalUnstructuredleasedlinedcdirectcurrentEMCElectroMagneticCompatibilityHDB3HighDensityBipolarcode3NTPNetworkTerminationPointONPOpenNetworkProvisionppmpartspermillionPRBSPseudoRandomBitSequenceRXRXisasignalinput(ateithertheleasedlineinterfaceorthetestequipment,seefigure1)TXTXisasignaloutput(ateithertheleasedlineinterfaceorthetestequipment,seefigure1)SIST EN 300 686 V1.2.1:2004

ETSIETSIEN300686V1.2.1(2001-07)94RequirementsTheserequirementsdefinethenetworkinterfacepresentationfor:-the34Mbit/sDigitalUnstructuredleasedline(D34U)whichprovidesabi-directionalpoint-to-pointdigitaltransmissioncapabilitywithausablebitrateof34368kbit/s-nostructuringofthedataisprovided,orshallberequired,bythenetworkandanystructuringistheresponsibilityoftheuser;-the140Mbit/sDigitalUnstructuredleasedline(D140U)whichprovidesabi-directionalpoint-to-pointdigitaltransmissioncapabilitywithausablebitrateof139264kbit/s-nostructuringofthedataisprovided,orshallberequired,bythenetworkandanystructuringistheresponsibilityoftheuser;-the34Mbit/sDigitalStructuredleasedline(D34S)whichprovidesabi-directionalpoint-to-pointdigitaltransmissioncapabilityforthesupportofanunstructured33920kbit/sinformationtransferrate;theframestructureinthe34368kbit/sbitstreamisdefinedinEN300687[6]-anystructuringofthedatawithinthetransparent33920kbit/spartoftheframeistheresponsibilityoftheuser;-the140Mbit/sDigitalStructuredleasedline(D140S)whichprovidesabi-directionalpoint-to-pointdigitaltransmissioncapabilityforthesupportofanunstructured138240kbit/sinformationtransferrate;theframestructureinthe139264kbit/sbitstreamisdefinedinEN300688[7]-anystructuringofthedatawithinthetransparent138240kbit/spartoftheframeistheresponsibilityoftheuser.Theprovisionoftimingistheresponsibilityoftheuser,howeverincertaininstallations,theleasedlineprovidermaybeabletoofferaservicewhichissynchronizedtothenetwork.NOTE1:Thenetworkinterfaceisnotdesignedforpowerfeedingcapabilities.NOTE2:Ifequipmentprovidingtheinterfacerequiresamainssupply,theleasedlineprovidershouldbringthistotheattentionoftheusersothattheusercanprovidemainssupplyback-upfacilities,ifrequired.Themechanicalcharacteristics,safety,overvoltageprotectionrequirementsandElectroMagneticCompatibility(EMC)requirementsarecommonforthe34Mbit/sand140Mbit/sleasedlines.Theelectricalcharacteristicsaredifferentandaredefinedinseparateclauses.4.1MechanicalcharacteristicsRequirement:Thenetworkinterfaceshallprovidetwocoaxial75Ωsockets,oneeachfortransmitandreceive,thesesocketsbeingeither:a)75Ωsockets(type1,6/5,6)complyingwithIEC60169-13[2];orb)75ΩBNCsocketscomplyingwiththegeneralrequirementsofIEC60169-8[1]withthematingdimensionsspecifiedinannexBofISO/IEC10173[3].Theouterconductorofthecoaxialpairshallbeconnectedtosignalgroundbothattheinputportandattheoutputport.NOTE1:WhenconnectingtheterminalequipmenttotheNetworkTerminationPoint(NTP),anydifferenceingroundpotentialbetweenthetwoequipmentsmayproduceavoltageacrossthesignalgroundconnectionandmaycausedamage.SeeEN50310(seeannexD)fordetailsofearthingrequirementswithinthecustomer'spremises.NOTE2:Thetransmitpairistheoutputfromthenetworkinterface.Thereceivepairistheinputtothenetworkinterface,asshowninfigure1.Wheretheterms"output"and"input"areusedwithoutqualificationinthepresentdocument,theyrefertothenetworkinterface.SIST EN 300 686 V1.2.1:2004

ETSIETSIEN300686V1.2.1(2001-07)10TXRXRXTXTERMINALEQUIPMENTINTERFACENETWORKINTERFACEOUTPUTINPUTINPUTOUTPUTFigure1Test:Thereshallbeavisualinspectionthatthesocketsareofthecorrecttype.4.2Electricalcharacteristics-34Mbit/s4.2.1Outputport4.2.1.1SignalcodingattheoutputportRequirement:ThesignaltransmittedattheoutputportshallcomplywiththeHighDensityBipolarcode3(HDB3)encodingrules(seeannexB).Test:ThetestshallbeconductedaccordingtoclauseA.2.1.1.4.2.1.2WaveformshapeRequirement:Thepulseattheoutputportshallcomplywiththerequirementsgiveninfigure2andtable1,basedonITU-TRecommendationG.703[4].Test:ThetestshallbeconductedaccordingtoclauseA.2.2.1.Table1:WaveformshapeatoutputportPulseshape(nominallyrectangular)Allmarksofavalidsignalshallconformtothemask(seefigure2).ThevalueVcorrespondstothenominalpeakvoltageofamark.Testloadimpedance75Ωnon-reactiveNominalpeakvoltageVofamark1,0VPeakvoltageofaspace0±0,1VNominalpulsewidth14,55nsRatiooftheamplitudesofpositiveandnegativepulsesatthecentreofthepulseinterval0,95to1,05Ratioofthewidthsofpositiveandnegativepulsesatthenominalhalfamplitude0,95to1,05SIST EN 300 686 V1.2.1:2004

ETSIETSIEN300686V1.2.1(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/spulse4.2.1.3OutputtimingunderfailureconditionsRequirement:Whenthereisafailurewithinthene
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