ETSI EN 300 687 V1.2.1 (2001-07)

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



SIST EN 300 687 V1.2.1:2003



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)cannotbeestimatedbytheleasedlineprovidersincenobitpatternsequenceisknown.Todeterminetheperformanceleveltheleasedlineneedstobetakenoutofservice(theuserwillnothaveanyaccesstotheleasedlineoranyserviceprovidedduringthemeasurementperiod).Theusermayalsomeasuretheerrorperformanceoftheleasedlinebyconnectingtestequipmenttotheleasedlineorbyusingaproprietaryperformancecalculationfacilityoftheterminalequipment.Theperformancelevelofastructuredleasedlineinservice(i.e.carryinguserdata)canbeestimatedfromtheBitInterleavedParity-8(BIP-8).Inorderfortheleasedlineprovidertoperformanaccurateerrormeasurement,theleasedlinemayneedtobetakenoutofservice(theuserwillnothaveanyaccesstotheleasedlineoranyserviceprovidedduringthemeasuringperiod).Ifaleasedlineproviderusestandemconnectionmonitoring,thebinarycontentoftheErrorMonitoring(EM)andNetworkOperator(NR)bytesmaychangebuttheparityinformationoftheBIP-8isretained.IftheEMbytewhichcontainstheBIP-8informationisnotgeneratedcorrectlybytheterminalequipment,theperformancemonitoringoftheleasedlinemaygiveincorrectresults.Requirement:Theperformanceofaleasedlineeitherinserviceortakenoutofserviceinordertoperformanerrorperformancemeasurement,shallmeettherequirementsgivenintable7.Table7:Performancelevelsover24hourperiodforablocklengthof4296bitsPerformanceparameterTerrestrialSatelliteES≤3126≤4912SES≤68≤112BBE≤68594≤107170Test:ThetestshallbeconductedaccordingtoclauseA.2.4.4.1.5.4AvailabilityThereisnorequirementonavailabilityunderthepresentdocument.NOTE1:AnnexDprovidesguidelinesonanapproachtothespecificationofavailabilityvalues.NOTE2:Atpresentsomeleasedlineprovidersincludeavailabilityperformance,definedonanindividualbasisasaqualityofserviceparameter,aspartofthecontractedsupplyconditionsfortheirleasedlineofferings.SIST EN 300 687 V1.2.1:2003



ETSIETSIEN300687V1.2.1(2001-07)14AnnexA(normative):TestmethodsA.1GeneralThisannexdescribesthetestprinciplestodeterminethecomplianceofaconnectionagainsttherequirementsofthepresentdocument.Itisoutsidethescopeofthisannextoidentifythespecificdetailsoftheimplementationofthetests.Detailsoftestequipmentaccuracyandthespecificationtoleranceofthetestdevicesarenotincludedinallcases.Wheresuchdetailsareprovidedtheyshallbecompliedwith,butthewaytheyareexpressedshallnotconstrainthemethodofimplementingthetest.NOTE:Attentionisdrawntotheissueofmeasurementuncertaintywhichmaybeaddressedinfuturedocuments.Notalltherequiredtestresultsmakeallowanceforspuriouseventsduringtesting(e.g.errorsduetoEMCeffects),whichmaymakeitnecessarytorepeatatest.Thetestconfigurationsgivendonotimplyaspecificrealisationofthetestequipmentortestarrangement,ortheuseofspecifictestdevices.Howeveranytestconfigurationusedshallprovidethosetestconditionsspecifiedunder"connectionstate","stimulus"and"monitor"foreachindividualtest.Thetestequipmentshallbeadevice,orgroupofdevicesthatiscapableofgeneratingastimulussignalconformingtoEN300686[1]andcapableofmonitoringthesignalreceivedfromthenetworkinterface.A.1.1EquipmentconnectionTestingshallbeperformedatthedefinedNTPasthisisthepointatwhichcompliancewiththepresentdocumentisrequired.A.2TestmethodsOnetestmaycovermorethanonerequirement.Thescopeofeachtestisdefinedunderthehea
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