SIST EN 300 686 V1.2.1:2004
(Main)Access and Terminals (AT); 34 Mbit/s and 140 Mbit/s digital leased lines (D34U, D34S, D140U, D140S); Network interface presentation
General Information
- 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
- 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
Overview
SIST EN 300 686 V1.2.1:2004 is a critical European standard developed by the Slovenski inštitut za standardizacijo (SIST) and ETSI, focusing on the interface presentation for 34 Mbit/s and 140 Mbit/s digital leased lines (D34U, D34S, D140U, D140S) within telecommunications networks. This standard outlines technical requirements and conformance test methods for public network interfaces for high-speed digital leased lines, supporting reliable and harmonized interconnection across Europe. Adhering to the specifications provided ensures interoperability between providers and users and enhances the overall safety and efficiency of digital leased line services.
Key Topics
- Network Interface Definitions: Specifies requirements for digital leased line interfaces at 34 Mbit/s and 140 Mbit/s, including unstructured (D34U, D140U) and structured (D34S, D140S) variants. The definitions cover both mechanical and electrical characteristics at Network Termination Points (NTPs).
- Interface Connectors: Determines mechanical standards for coaxial 75Ω sockets, referencing IEC 60169-13 and IEC 60169-8 (BNC types), ensuring standardized physical connections.
- Signal Coding: Describes encoding requirements:
- HDB3 (High Density Bipolar of Order 3) for 34 Mbit/s lines
- CMI (Coded Mark Inversion) for 140 Mbit/s lines
- Performance and Conformance Testing: Outlines test methods and acceptance criteria for waveform shape, pulse mask, output timing under network failure conditions, return loss, and input tolerances.
- Safety and Compliance: Addresses safety-related liaison from TC Safety. While safety, overvoltage, and EMC aspects are outside the direct scope, the document highlights the need for compliance with relevant product safety and electromagnetic compatibility standards.
Applications
SIST EN 300 686 is widely applicable to:
- Telecommunications Operators: Ensures that digital leased lines delivered to enterprise and carrier customers meet harmonized European standards, allowing for predictable performance and easier troubleshooting.
- Enterprise Networking: Businesses integrating high-capacity leased lines for corporate communications rely on interoperability at the network interface, reducing installation and maintenance costs.
- Equipment Manufacturers: Companies that produce network terminals, routers, or other transmission equipment use this specification to design compliant interfaces for 34 Mbit/s and 140 Mbit/s leased lines.
- Network Test and Maintenance: Defines how test equipment should evaluate compliance, supporting both initial installation and ongoing operational assurance.
The standard applies to leased lines-including part-time connections-where no protocol exchange is needed at the NTP for setup and teardown. This simplicity ensures efficient access and broad compatibility across public telecommunications networks.
Related Standards
For full compliance and complementary information, the following standards should be consulted alongside SIST EN 300 686:
- EN 300 687: Access and Terminals (AT); 34 Mbit/s digital leased lines; Connection characteristics
- EN 300 688: Access and Terminals (AT); 140 Mbit/s digital leased lines; Connection characteristics
- EN 300 689: 34 Mbit/s digital leased lines; Terminal equipment interface
- EN 300 690: 140 Mbit/s digital leased lines; Terminal equipment interface
- ITU-T G.703: Physical/electrical characteristics of hierarchical digital interfaces
- IEC 60169-13 & IEC 60169-8: Specifications for connector types used at the interface
Practical Value
Implementing SIST EN 300 686 ensures reliable, secure, and consistent network interface presentations for high-speed leased lines in telecommunications infrastructure. It streamlines cross-border digital communication, enhances equipment interoperability, and simplifies service rollout and maintenance-meeting the needs of both network providers and end-users in an evolving digital landscape.
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Frequently Asked Questions
SIST EN 300 686 V1.2.1:2004 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Access and Terminals (AT); 34 Mbit/s and 140 Mbit/s digital leased lines (D34U, D34S, D140U, D140S); Network interface presentation". This standard covers: Revision to improve safety related text following a liaison from TC Safety. Specification of the public network interface and test methods for compliance.
Revision to improve safety related text following a liaison from TC Safety. Specification of the public network interface and test methods for compliance.
SIST EN 300 686 V1.2.1:2004 is classified under the following ICS (International Classification for Standards) categories: 33.040.50 - Lines, connections and circuits. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 300 686 V1.2.1:2004 is associated with the following European legislation: Standardization Mandates: T-297. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
SIST EN 300 686 V1.2.1:2004 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
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 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.:+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 300 686 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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