SIST EN 300 687 V1.2.1:2003
(Main)Access and Terminals (AT); 34 Mbit/s digital leased lines (D34U and D34S); Connection characteristics
General Information
- Abstract
Specification of the performance required for the connection through the public network, including test procedures for compliance. Revision of ETS 300 687 to improve the safety related aspects following a liaison received from TC Safety.
- Status
- Published
- Publication Date
- 30-Nov-2003
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-2003
- Due Date
- 01-Dec-2003
- Completion Date
- 01-Dec-2003
Overview
SIST EN 300 687 V1.2.1:2003 specifies the connection characteristics and performance requirements for 34 Mbit/s digital leased lines, focusing on both structured (D34S) and unstructured (D34U) variants. Developed by the Slovenian Institute for Standardization (SIST) and harmonized with EN 300 687, this standard ensures interoperability and reliability for point-to-point digital leased line connections across public telecommunications networks.
This document defines essential attributes such as data transfer rates, structure, transmission integrity, symmetry, network performance (including error rates, delay, and jitter), as well as the necessary test procedures for compliance. The standard supports regulatory requirements for open, efficient access to leased lines and addresses enhanced safety aspects.
Keywords: digital leased lines, 34 Mbit/s, connection characteristics, D34U, D34S, telecommunications standards, network performance, test procedures, structured/unstructured leased lines.
Key Topics
- Connection Characteristics: Detailed requirements for 34 Mbit/s connections, covering both D34U (unstructured) and D34S (structured) leased lines.
- Performance Metrics: Specifies limits for transfer rate, information integrity, transmission delay, jitter, error performance, and symmetry.
- Compliance Testing: Defines standard test methods for transfer rate, delay, jitter, error rate measurement, structural integrity, and loss of signal scenarios.
- Frame Structure: For structured lines (D34S), frame formatting must be consistent with ITU-T recommendations, including defined bytes for alignment and payload.
- Safety Considerations: Includes revisions to improve safety-related aspects in response to liaison from TC Safety.
- Test Conditions: All measurements and conformance tests are to be performed at the network termination point (NTP).
Applications
SIST EN 300 687 V1.2.1:2003 is crucial for organizations involved in:
- Telecommunications Service Provision: Ensures public network providers offer leased line services with standardized connection and performance characteristics. This supports consistent quality and reliability for business-critical data transmission.
- Network Equipment Manufacturing: Guides manufacturers in designing and testing customer-premises equipment and network interface devices for compatibility with 34 Mbit/s leased lines.
- System Integration and Engineering: Assists in designing and deploying data networks that require robust, high-capacity point-to-point digital links for applications such as enterprise WANs, multimedia communications, and data center interconnections.
- Regulatory Compliance: Supports compliance with EU directives on Open Network Provision (ONP) by harmonizing leased line characteristics across networks.
- Quality Assurance: Defines criteria for acceptance and maintenance of digital leased line connections, assisting operators and customers in monitoring line integrity and diagnosing faults.
Related Standards
- EN 300 686: Specifies the network interface presentation for 34 Mbit/s and 140 Mbit/s digital leased lines (D34U, D34S, D140U, D140S).
- ITU-T Recommendation G.832: Framestructure for 34 Mbit/s structured digital leased lines.
- ITU-T Recommendation G.826: Reference for error performance objectives in digital line systems.
- ITU-T Recommendation O.151 and O.171: Equipment requirements for performance and jitter measurement at primary rate and above.
SIST EN 300 687 V1.2.1:2003 aligns with these international standards to ensure global compatibility and interoperability, helping network operators and service providers deliver high-quality, reliable leased line services.
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Frequently Asked Questions
SIST EN 300 687 V1.2.1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Access and Terminals (AT); 34 Mbit/s digital leased lines (D34U and D34S); Connection characteristics". This standard covers: Specification of the performance required for the connection through the public network, including test procedures for compliance. Revision of ETS 300 687 to improve the safety related aspects following a liaison received from TC Safety.
Specification of the performance required for the connection through the public network, including test procedures for compliance. Revision of ETS 300 687 to improve the safety related aspects following a liaison received from TC Safety.
SIST EN 300 687 V1.2.1:2003 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 300 687 V1.2.1:2003 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.Access and Terminals (AT); 34 Mbit/s digital leased lines (D34U and D34S); Connection characteristics33.040.50Vodi, zveze in tokokrogiLines, connections and circuitsICS:Ta slovenski standard je istoveten z:EN 300 687 Version 1.2.1SIST EN 300 687 V1.2.1:2003en01-december-2003SIST EN 300 687 V1.2.1:2003SLOVENSKI
STANDARD
ETSIEN300687V1.2.1(2001-07)EuropeanStandard(Telecommunicationsseries)AccessandTerminals(AT);34Mbit/sdigitalleasedlines(D34UandD34S);ConnectioncharacteristicsSIST EN 300 687 V1.2.1:2003
ETSIETSIEN300687V1.2.1(2001-07)2ReferenceREN/AT-020015Keywordsaccess,digital,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 300 687 V1.2.1:2003
ETSIETSIEN300687V1.2.1(2001-07)3ContentsIntellectualPropertyRights.5Foreword.5Introduction.51Scope.62References.63Definitionsandabbreviations.73.1Definitions.73.2Abbreviations.84Requirements.84.1Attributes.94.1.1Transferrate.94.1.1.1Leasedlinetiming.94.1.1.2Informationtransferrate.104.1.2Informationtransfersusceptance.104.1.3Structure.104.1.3.1Frameintegrity.104.1.3.2Lossofinputsignal.104.1.4Symmetry.104.1.5Networkperformance.104.1.5.1Transmissiondelay.114.1.5.2Jitter.114.1.5.2.1Jittertoleranceatthenetworkinputport.114.1.5.2.2Maximumjitteratthenetworkoutputport.124.1.5.3Errorperformance.124.1.5.3.1BringingIntoService(BIS)limits.124.1.5.3.2Performancelevel.134.1.5.4Availability.13AnnexA(normative):Testmethods.14A.1General.14A.1.1Equipmentconnection.14A.2Testmethods.14A.2.1Leasedlinetiming,informationtransferrate,susceptanceandsymmetry.14A.2.2Delay.15A.2.3Jitter.16A.2.4Errorperformance.18A.2.5Structure-frameintegrity.19A.2.6Structure-lackofinputsignal.20AnnexB(normative):Definitionofframestructure.21B.1Framestructureat34368kbit/s.21AnnexC(informative):Derivationoferrorperformancelimits.22C.1Introduction.22C.2Referenceconnections.22C.2.1Terrestrialconnection.22C.2.2Satelliteconnection.23C.3Errorperformanceobjectives.23C.4Longtermerrorperformance.24SIST EN 300 687 V1.2.1:2003
ETSIETSIEN300687V1.2.1(2001-07)4AnnexD(informative):Availability.25D.1General.25D.1.1Unavailability.25D.1.2Outageintensity.25D.1.3Meantimebetweenfailures.25D.1.4Meantimetorestoreservice.25D.2Recommendations.25AnnexE(informative):BringingIntoService(BIS)limits.27E.1General.27E.2BISlimits.27AnnexF(informative):Bibliography.28History.29SIST EN 300 687 V1.2.1:2003
ETSIETSIEN300687V1.2.1(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)toprovidestandardsforsupportoftheDirectiveonOpenNetworkProvision(ONP)ofleasedlines(92/44/EEC).Thereisoneotherstandardthatisdirectlyrelatedtothepresentdocument:-EN300686:"AccessandTerminals(AT);34Mbit/sand140Mbit/sdigitalleasedlines(D34U,D34S,D140U,D140S);Networkinterfacepresentation".ThepresentdocumentisbasedoninformationfromITU-TRecommendationsandETSIpublications;therelevantdocumentsarequotedwhereappropriate.NationaltranspositiondatesDateofadoptionofthisEN:29June2001DateoflatestannouncementofthisEN(doa):30September2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31March2002DateofwithdrawalofanyconflictingNationalStandard(dow):31March2002IntroductionTheCouncilDirectiveontheapplicationofOpenNetworkProvision(ONP)toleasedlines(92/44/EEC)concernstheharmonisationofconditionsforopenandefficientaccessto,anduseof,theleasedlinesprovidedoverpublictelecommunicationsnetworks,andtheavailabilitythroughouttheEuropeanUnionofaminimumsetofleasedlineswithharmonizedtechnicalcharacteristics.The34Mbit/sstructuredandunstructuredleasedlinesarenotpartoftheminimumsetofleasedlinesundertheDirective,however,thepresentdocumentisbeingwrittenwiththeintentionthatwhere34Mbit/sleasedlinesareoffered,theywillbeinaccordancewiththeseharmonizedstandards.UndertheDirective91/263/EEC,laterreplacedby98/13/EC,TerminalEquipment(TE)forconnectiontotheseleasedlineswasrequiredtofulfilcertainessentialrequirements.Thepresentdocumenthasbeenproducedtointroducesomenecessarychanges.SIST EN 300 687 V1.2.1:2003
ETSIETSIEN300687V1.2.1(2001-07)61ScopeThepresentdocumentspecifiesthetechnicalrequirementsandconformancetestsforconnectioncharacteristicsofpoint-to-point34Mbit/sdigitalleasedlines.Theseleasedlinesoperateat:-34368kbit/sprovidinganinformationtransmissioncapability,withoutrestrictiononbinarycontent,(D34U);and-34368kbit/sprovidinganinformationtransmissioncapability,withoutrestrictiononbinarycontent,of33920kbit/s,(D34S);theremaining448kbit/sprovidesan8kHzframingstructureinaccordancewithITU-TRecommendationG.832.AconnectionispresentedviainterfacesatNetworkTerminationPoints(NTPs)andincludesanyequipmentthatmayprovidetheNTP.SignalsbetweenNTPsaresubjecttoimpairmentsduringtheirtransferovertheconnection.Thelimitstotheseimpairmentsarestatedinthepresentdocument.Thepresentdocument,togetherwiththecompanionstandardEN300686[1],definingthenetworkinterfacepresentation,describesthetechnicalcharacteristicsoftheleasedline.Thetestsspecifiedinthepresentdocumentcannotbecarriedoutbytheleasedlineproviderwhiletheleasedlineisinservice,i.e.carryingusers'traffic.Thusthetestsaredesignedforbringingintoandreturningintoservice,althoughthereisnoobligationtoperformthesetestseachtimealeasedlineisbroughtintoorreturnedintoservice.However,iftheconnectionisstructured,theerrorperformancemaybemonitoredbytheleasedlineproviderwhilethelineisinservice.Thepresentdocumentisapplicableforleasedlines,includingparttimeleasedlines,forwhichtheestablishmentorreleasedoesnotrequireanyprotocolexchangeorotherinterventionattheNTP.Thepresentdocumentspecifiestheconformancetestsfortheconnectionrequirements.Thepresentdocumentdoesnotincludedetailsconcerningtheimplementationofthetests,nordoesitincludeinformationonanyrelevantregulations.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublicationand/oreditionnumberorversionnumber)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.[1]ETSIEN300686:"AccessandTerminals(AT);34Mbit/sand140Mbit/sdigitalleasedlines(D34U,D34S,D140U,D140S);Networkinterfacepresentation".[2]ITU-TRecommendationO.151(1992):"Errorperformancemeasuringequipmentoperatingattheprimaryrateandabove".[3]ITU-TRecommendationO.171(1997):"Timingjitterandwandermeasuringequipmentfordigitalsystemswhicharebasedontheplesiochronousdigitalhierarchy(PDH)".SIST EN 300 687 V1.2.1:2003
ETSIETSIEN300687V1.2.1(2001-07)73Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:BackgroundBlockErrorRatio(BBER):ratiooferroredblockstototalblocksduringafixedmeasurementintervalexcludingallblocksduringseverelyerroredsecondsandwhiletheleasedlineconnectionisintheunavailablestateBackgroundBlockError(BBE):erroredblocknotoccurringaspartofaseverelyerroredsecondblock:setofconsecutivebitsequivalenttooneframe;eachbitbelongstooneandonlyoneblock.Thelengthofeachblockcorrespondstoaperiodof125microseconds.erroredblock:blockinwhichoneormorebitsareinerrorErroredSecond(ES):one-secondperiodwithoneormoreerroredblocksErroredSecondsRatio(ESR):ratiooferroredsecondstototalsecondsduringafixedmeasurementinterval.TheESRisnotevaluatedwhiletheleasedlineconnectionisintheunavailablestateframe:repetitivesetofconsecutivebitsinwhichthepositionofeachbitcanbeidentifiedbyreferencetoaframealignmentsignalframealignmentsignal:distinctivesignalinsertedineveryframealwaysoccupyingthesamerelativepositionwithintheframeandusedtoestablishandmaintainframealignmentleasedlines:telecommunicationsfacilitiesprovidedbyapublictelecommunicationsnetworkthatprovidedefinedtransmissioncharacteristicsbetweennetworkterminationpointsandthatdonotincludeswitchingfunctionsthattheusercancontrol,(e.g.on-demandswitching)NetworkTerminationPoint(NTP):allphysicalconnectionsandtheirtechnicalaccessspecificationswhichformpartofthepublictelecommunicationsnetworkandarenecessaryforaccesstoandefficientcommunicationthroughthatpublicnetworkPRBS(223-1):PseudoRandomBitSequence(PRBS)(asdefinedinclause2.2ofITU-TRecommendationO.151)satellitetransmission:transmissionviaanearthorbitingsatelliteseverelydisturbedperiod:forout-of-servicemeasurements,aseverelydisturbedperiodoccurswhen,overaperiodoftimeequivalenttofourcontiguousblocks,eitherallthecontiguousblocksareaffectedbyahighbiterrordensityof≥10-2,oralossofsignalisobserved.Forin-servicemonitoringpurposes,aseverelydisturbedperiodisestimatedbytheoccurrenceoflossofsignalorlossofframealignment.SeverelyErroredSecond(SES):one-secondperiodwhichcontains≥30%erroredblocksoratleastoneseverelydisturbedperiodSeverelyErroredSecondsRatio(SESR):ratioofseverelyerroredsecondstototalsecondsduringafixedmeasurementinterval.TheSESRisnotevaluatedwhiletheleasedlineconnectionisintheunavailablestate.unavailabilityperiod:beginsattheonsetof10consecutiveSES.These10secondsareconsideredtobepartoftheunavailabilityperiod.Theunavailabilityperiodendsattheonsetof10consecutivenon-severelyerroredseconds.These10secondsarenotconsideredpartoftheunavailabilityperiod.unavailablestate:leasedlineconnectionisintheunavailablestateifanunavailabilityperiodisoccurringinoneorbothdirectionsoftransmissionSIST EN 300 687 V1.2.1:2003
ETSIETSIEN300687V1.2.1(2001-07)83.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:AISAlarmIndicationSignalBBEBackgroundBlockErrorBBERBackgroundBlockErrorRatioBIP-8BitInterleavedParity(8bit)BISBringingIntoServiceCRC-7CyclicRedundancyCheck(7bit)D34S34Mbit/sdigitalstructuredleasedlineD34U34Mbit/sdigitalunstructuredleasedlineEMErrorMonitoringEMCElectroMagneticCompatibilityESErroredSecondESRErroredSecondsRatioFA1FrameAlignmentbyte1FA2FrameAlignmentbyte2GCGeneralpurposeCommunicationschannelHDB3HighDensityBipolarcode3LSBLeastSignificantBitMAMaintenanceandAdaptationMSBMostSignificantBitNRNetworkoperatorbyteNTPNetworkTerminationPointONPOpenNetworkProvisionppmpartspermillionPRBSPseudoRandomBitSequenceRDIRemoteDefectIndicationREIRemoteErrorIndicationRPOReferencePerformanceObjectiveRXRXisasignalinput(ateithertheleasedlineinterfaceorthetestequipment)SESSeverelyErroredSecondSESRSeverelyErroredSecondsRatioTMTimingMarkerTRTRailtraceTXTXisasignaloutput(ateithertheleasedlineinterfaceorthetestequipment)UIUnitInterval4RequirementsTheperformanceoftheleasedlineshallcomplywiththeserequirementsonlyiftheconditionsofsupplyofthenetworkequipmentprovidingtheNTParemet,(e.g.iftheequipmentisconnectedtoanappropriatepowersupplyonthecustomer'spremises).TheITU-Tattributetechniqueisusedtoexpresstheconnectionrequirements.ThefollowingattributesfromITU-TRecommendationI.140arespecifiedinthepresentdocument:-transferrate;-informationtransfersusceptance;-structure;-establishmentofconnection;-symmetry;-connectionconfiguration;-networkperformance.SIST EN 300 687 V1.2.1:2003
ETSIETSIEN300687V1.2.1(2001-07)9Thefollowingnetworkperformancesub-attributesareconsideredrelevantforthepresentdocument:-transmissiondelay;-jitter;-error;-availability.4.1AttributesTheconnectionattributesaredisplayedintable1.Ineffect,theseattributesdefinetheservicebeingoffered.Thevaluesandtheassociatedcompliancetestscanbefoundinthesubsequentclauses.Table1:ConnectionattributesD34UD34SConnectiontypeattributesValue/natureTransferrate-leasedlinetiming-informationtransferrate34368kbit/s±20ppm34368kbit/s±20ppm34368kbit/s±20ppm33920kbit/s±20ppmInformationtransfersusceptanceUnrestricteddigitalStructureUnstructuredFrameintegrityEstablishmentofconnectionWithoutuserinterventionSymmetrySymmetricalinbothdirectionsConnectionconfigurationPoint-to-pointTransmissiondelay-terrestrial(fordistanceGinkm)-satellite≤(10+0,01G)ms≤350msJitteratinputport0,4UIfrom100Hzto1kHz0,15UIfrom10kHzto800kHzJitteratoutputport1,4UIfrom100Hzto800kHz0,14UIfrom10kHzto800kHzAvailabilityNorequirementErrorparametersD34UandD34STerrestrialSatelliteEnd-to-endperformanceobjectives.-ErroredSecondsRatio(ESR)-SeverelyErroredSecondsRatio(SESR)-BackgroundBlockErrorRatio(BBER)≤3,75%≤0,10%≤0,01%≤5,850%≤0,156%≤0,016%Performancelevelsovera24hourperiod-ErroredSeconds(ES)-SeverelyErroredSeconds(SES)-BackgroundBlockErrors(BBE)≤3126≤68≤68594≤4912≤112≤1071704.1.1Transferrate4.1.1.1LeasedlinetimingRequirement:Theleasedlineshallbecapableofcarryingusertimingwithintherangeof34368kbit/s±20ppm.Theleasedlineprovidermayalsooffertotheuserincertaininstallationsthecapabilityfortheleasedlinetobesynchronizedtonetworktiming.NOTE:Networktimingistimingthatisderivedfromthesourceorsourcesoftimingthatareusedforthenetwork(i.e.anationalprimaryreferenceclock).Thusthetimingprovidedbytheleasedlinewillbesimilartothatprovidedbyotherdigitalservices.Test:ThetestshallbeconductedaccordingtoclauseA.2.1.SIST EN 300 687 V1.2.1:2003
ETSIETSIEN300687V1.2.1(2001-07)104.1.1.2InformationtransferrateRequirement:Theconnectionshallbecapableoftransferringanominalinformationrate,definedintable2.Table2:InformationtransferrateD34UD34SInformationtransferrate34368kbit/s±20ppm33920kbit/s±20ppmTest:ThetestshallbeconductedaccordingtoclauseA.2.1.4.1.2InformationtransfersusceptanceRequirement:Theconnectionshallbecapableoftransferringunrestricteddigitalinformationwithbitsequenceintegrityatthenominalrate,definedintable3.Table3:InformationtransfersusceptanceD34UD34SInformationtransfersusceptance34368kbit/s±20ppm33920kbit/s±20ppmTest:ThetestshallbeconductedaccordingtoclauseA.2.1.4.1.3Structure4.1.3.1FrameintegrityTherequirementofthisclauseappliesonlytotheD34Sleasedline.Requirement:WhenasignalwiththestructuredefinedinannexBisappliedtotheinputoftheD34Sleasedline,theoutputsignalatthefarendshallalsoconformtothestructuredefinedinannexBandtheframealignmentbyte(FA1andFA2)shallbeinthesamepositioninrelationtothecontentsofthepayload.Test:ThetestshallbeconductedaccordingtoclauseA.2.5.4.1.3.2LossofinputsignalRequirement:Whenthereisnoinputsignaltotheleasedline,theoutputsignalatthefarendoftheleasedlineshallbeAlarmIndicationSignal(AIS)(allones).Test:ThetestshallbeconductedaccordingtoclauseA.2.6.4.1.4SymmetryRequirement:Theconnectionshallbesymmetrical,i.e.eachdirectionoftransmissionshallhavethesameinformationtransfercapability(D34UandD34S)andthesameframestructure(D34S).Test:ThetestshallbeconductedaccordingtoclauseA.2.1.4.1.5NetworkperformanceThenetworkperformancesub-attributesaredisplayedintable1.Thevaluesandtheassociatedcompliancetestscanbefoundinthesubsequentclauses.SIST EN 300 687 V1.2.1:2003
ETSIETSIEN300687V1.2.1(2001-07)114.1.5.1TransmissiondelayRequirement:Therequirementdependsuponwhethersatellitetransmissionisinvolvedintheconnectionornot:a)forconnectionswheresatellitetransmissionisnotinvolved,theonewayend-to-enddelayshallbelessthanorequalto(10+0,01G)ms,whereGisthegeographicaldistanceinkilometres,asshowninfigure1;orDelay(ms)Geographicaldistance(km)000900030006000100Figure1:Upperlimitofdelayb)forconnectionswheresatellitetransmissionisinvolved,theonewayend-to-enddelayshallbelessthanorequalto350ms.NOTE:Requirementsa)andb)arebasedonITU-TRecommendationG.114,annexA.2andA.3.Therearenorequirementsforlowfrequency(below20Hz)variationofonewayend-to-enddelayunderthepresentdocument.Test:ThetestshallbeconductedaccordingtoclauseA.2.2.4.1.5.2Jitter4.1.5.2.1JittertoleranceatthenetworkinputportRequirement:Theleasedlineshallfunctionasspecifiedwithinputjitterbeingthesumofthebandlimitedcomponentsdefinedintable4.NOTE:Thejittertolerancefortheconnectionisdefinedinthiswayinsteadofspecifyingsinglejitterfrequencies,forthefollowingreasons:a)thismethodismorerepresentativeofthejitterencounteredinpractice;andb)longregeneratorchainsmaybeespeciallysensitivetosinglejitterfrequencies.SIST EN 300 687 V1.2.1:2003
ETSIETSIEN300687V1.2.1(2001-07)12Table4:ComponentsofinputjitterFiltersforgenerationofjitterspectrum(firstorder)BandpassfilterformeasurementofinputjitterInputjittermeasuredbybandpassfilterLowercut-off(highpass)Uppercut-off(lowpass)(lowercut-offfirstorder)UnitInterval(UI)peak-to-peak(maximum)100Hz1kHz100Hzto800kHz0,410kHz800kHz10kHzto800kHz0,15Test:ThetestshallbeconductedaccordingtoclauseA.2.3.4.1.5.2.2MaximumjitteratthenetworkoutputportRequirement:Themaximumjitterattheoutputportofthenetworkshallnotexceedthelimitsspecifiedintable5,basedonITU-TRecommendationG.823,whenmeasuredwithlinearfilterswiththedefinedcut-offfrequencies.Atfrequenciesbelowthelower3dBpoint,theattenuationofthehighpassfiltershallrisewithavaluegreaterthan,orequalto,20dBperdecade.Atfrequenciesabovetheupper3dBpoint,theattenuationofthelowpassfiltrationshallrisewithavaluegreaterthan,orequalto,60dBperdecade.Forthemeasurement,themaximuminputjitterasspecifiedinclause4.1.5.2.1shallbeapplied.Table5:MaximumnetworkoutputjitterMeasurementfilterbandwidthOutputjitterLowercut-off(highpass)Uppercut-off(lowpass)UIpeak-to-peak(maximum)100Hz800kHz1,410kHz800kHz0,14Test:ThetestshallbeconductedaccordingtoclauseA.2.3.4.1.5.3ErrorperformanceErroredseconds,severelyerroredsecondsandbackgroundblockerrorsshallbeexcludedfromthemeasurementoftheerrorperformanceiftheleasedlineisintheunavailablestate.NOTE:Whenmicrowavelinksareusedintheconnectionitmaynotbepossibletomeettherequirementinrareperiodswithveryadversepropagationconditions.Theend-to-enderrorperformanceratesfora34Mbit/sdigitalleasedlineusingterrestrialorsatelliteconnectionsareshownintable6.ThesearebasedonthereferenceconnectionsshowninannexCderivedfromITU-TRecommendationG.826andarevalidforblocksizesof4000to20000bits.Table6:End-to-enderrorperformanceobjectivesfora34Mbit/sdigitalleasedlinePerformanceparameterTerrestrialSatelliteESR3,75%5,850%SESR0,10%0,156%BBER0,01%0,016%Thesefiguresfortheerrorperformanceareusedinthederivationoftheperformancelevelsgiveninclause4.1.5.3.2.ThederivationofthesefiguresisgiveninannexC.4.1.5.3.1BringingIntoService(BIS)limitsThereisnorequirementonBISlimitsunderthepresentdocument.NOTE:AnnexEprovidesguidelineson24hourand2hourBISlimits.SIST EN 300 687 V1.2.1:2003
ETSIETSIEN300687V1.2.1(2001-07)134.1.5.3.2PerformancelevelTheperformancelevelofanunstructuredleasedlineinservice(i.e.carryinguserdata)cannotbeestimatedbytheleasedlineprovidersincenobitpatternsequence
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