ETSI EN 300 688 V1.2.1 (2001-07)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Access and Terminals (AT); 140 Mbit/s digital leased lines (D140U and D140S); Connection characteristics33.040.50Vodi, zveze in tokokrogiLines, connections and circuitsICS:Ta slovenski standard je istoveten z:EN 300 688 Version 1.2.1SIST EN 300 688 V1.2.1:2003en01-december-2003SIST EN 300 688 V1.2.1:2003SLOVENSKI
STANDARD



SIST EN 300 688 V1.2.1:2003



ETSIEN300688V1.2.1(2001-07)EuropeanStandard(Telecommunicationsseries)AccessandTerminals(AT);140Mbit/sdigitalleasedlines(D140UandD140S);ConnectioncharacteristicsSIST EN 300 688 V1.2.1:2003



ETSIETSIEN300688V1.2.1(2001-07)2ReferenceREN/AT-020016Keywordsaccess,digital,leasedline,ONPETSI650RoutedesLuciolesF-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 300 688 V1.2.1:2003



ETSIETSIEN300688V1.2.1(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.114.1.5.1Transmissiondelay.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.15A.2.1Leasedlinetiming,informationtransferrate,susceptanceandsymmetry.15A.2.2Delay.16A.2.3Jitter.17A.2.4Errorperformance.19A.2.5Structure-frameintegrity.20A.2.6Structure-lackofinputsignal.21AnnexB(normative):Definitionofframestructure.22B.1Framestructureat139364kbit/s.22AnnexC(informative):Derivationoferrorperformancelimits.24C.1Introduction.24C.2Referenceconnections.24C.2.1Terrestrialconnection.24C.2.2Satelliteconnection.25C.3Errorperformanceobjectives.25C.4Longtermerrorperformance.26SIST EN 300 688 V1.2.1:2003



ETSIETSIEN300688V1.2.1(2001-07)4AnnexD(informative):Availability.27D.1General.27D.1.1Unavailability.27D.1.2Outageintensity.27D.1.3Meantimebetweenfailures.27D.1.4Meantimetorestoreservice.27D.2Recommendations.27AnnexE(informative):BringingIntoService(BIS)limits.29E.1General.29E.2BISlimits.29AnnexF(informative):Bibliography.30History.31SIST EN 300 688 V1.2.1:2003



ETSIETSIEN300688V1.2.1(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):31March2002IntroductionTheCouncilDirectiveontheapplicationofONPtoleasedlines(92/44/EEC)concernstheharmonizationofconditionsforopenandefficientaccessto,anduseof,theleasedlinesprovidedoverpublictelecommunicationsnetworks,andtheavailabilitythroughouttheEuropeanUnionofaminimumsetofleasedlineswithharmonizedtechnicalcharacteristics.The140Mbit/sunstructuredandstructuredleasedlinesarenotpartoftheminimumsetofleasedlinesundertheDirective,however,thepresentdocumentisbeingwrittenwiththeintentionthatwhere140Mbit/sleasedlinesareoffered,theywillbeinaccordancewiththeseharmonizedstandards.UndertheDirective91/263/EEC(seeannexF),laterreplacedby98/13/EC(seeannexF),terminalequipmentforconnectiontotheseleasedlineswasrequiredtofulfilcertainessentialrequirements.Thepresentversionofthepresentdocumenthasbeenproducedtointroducesomenecessarychanges.SIST EN 300 688 V1.2.1:2003



ETSIETSIEN300688V1.2.1(2001-07)61ScopeThepresentdocumentspecifiesthetechnicalrequirementsandconformancetestsforconnectioncharacteristicsofpoint-to-point140Mbit/sdigitalleasedlines.Theseleasedlinesoperateat:-139264kbit/sprovidinganinformationtransmissioncapability,withoutrestrictiononbinarycontent,(D140U);and-139264kbit/sprovidinganinformationtransmissioncapability,withoutrestrictiononbinarycontent,of138240kbit/s,(D140S);theremaining1024kbit/sprovidesan8kHzframingstructureinaccordancewithETS300337(ITU-TRecommendationG.832)(seeannexF).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(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.[1]ETSIEN300686:"AccessandTerminals(AT);34Mbit/sand140Mbit/sdigitalleasedlines(D34U,D34S,D140U,D140S);Networkinterfacepresentation".[2]ITU-TRecommendationO.151(1992):"Errorperformancemeasuringequipmentoperatingattheprimarybitrateandabove".[3]ITU-TRecommendationO.171(1997):"Timingjitterandwandermeasuringequipmentfordigitalsystemswhicharebasedontheplesiochronousdigitalhierarchy(PDH)".SIST EN 300 688 V1.2.1:2003



ETSIETSIEN300688V1.2.1(2001-07)73Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:BackgroundBlockErrorRatio(BBER):ratiooferroredblockstototalblocksduringafixedmeasurementintervalexcludingallblocksduringseverelyerroredsecondsandwhiletheleasedlineconnectionisintheunavailablestateBackgroundBlockError(BBE):erroredblocknotoccurringaspartofaseverelyerroredsecondblock:setofconsecutivebitsequivalenttooneframe;eachbitbelongstooneandonlyoneblock.Thelengthofeachblockcorrespondstoaperiodof125microsecondserroredblock: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,aseverelydisturbedperiodisestimatedbytheoccurrenceoflossofsignalorlossofframealignmentSeverelyErroredSecond(SES):one-secondperiodwhichcontains≥30%erroredblocksoratleastoneseverelydisturbedperiodSeverelyErroredSecondsRatio(SESR):ratioofseverelyerroredsecondstototalsecondsduringafixedmeasurementinterval.TheSESRisnotevaluatedwhiletheleasedlineconnectionisintheunavailablestateunavailabilityperiod:unavailabilityperiodbeginsattheonsetof10consecutiveSES.These10secondsareconsideredtobepartoftheunavailabilityperiod.Theunavailabilityperiodendsattheonsetof10consecutivenon-severelyerroredseconds.These10secondsarenotconsideredpartoftheunavailabilityperiodunavailablestate:leasedlineconnectionisintheunavailablestateifanunavailabilityperiodisoccurringinoneorbothdirectionsoftransmissionSIST EN 300 688 V1.2.1:2003



ETSIETSIEN300688V1.2.1(2001-07)83.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:AISAlarmIndicationSignalBBEBackgroundBlockErrorBBERBackgroundBlockErrorRatioBIP-8BitInterleavedParity(8bit)BISBringingIntoServiceCMICodedMarkInversionD140U140Mbit/sdigitalunstructuredleasedlineD140S140Mbit/sdigitalstructuredleasedlineEMErrorMonitoringEMCElectroMagneticCompatibilityESErroredSecondESRErroredSecondsRatioFA1FrameAlignmentbyte1FA2FrameAlignmentbyte2GCGeneralpurposeCommunicationschannelLSBLeastSignificantBitMAMaintenanceandAdaptationMSBMostSignificantBitNRNetworkoperatorbyteNTPNetworkTerminationPointONPOpenNetworkProvisionppmpartspermillionPRBSPseudoRandomBitSequenceRDIRemoteDefectIndicationREIRemoteErrorIndicationRPOReferencePerformanceObjectiveRXRXisasignalinput(ateithertheleasedlineinterfaceorthetestequipment)SESSeverelyErroredSecondSESRSeverelyErroredSecondsRatioTMTimingMarkerTRTRailtraceTXTXisasignaloutput(ateithertheleasedlineinterfaceorthetestequipment)UIUnitInterval4RequirementsTheperformanceoftheleasedlineshallcomplywiththeserequirementsonlyiftheconditionsofsupplyofthenetworkequipmentprovidingtheNTParemet,(e.g.iftheequipmentisconnectedtoanappropriatepowersupplyonthecustomer'spremises).TheITU-Tattributetechniqueisusedtoexpresstheconnectionrequirements.ThefollowingattributesfromITU-TRecommendationI.140(seeannexF)arespecifiedinthepresentdocument:-transferrate;-informationtransfersusceptance;-structure;-establishmentofconnection;-symmetry;-connectionconfiguration;-networkperformance.SIST EN 300 688 V1.2.1:2003



ETSIETSIEN300688V1.2.1(2001-07)9Thefollowingnetworkperformancesub-attributesareconsideredrelevantforthepresentdocument:-transmissiondelay;-jitter;-error;-availability.4.1AttributesTheconnectionattributesaredisplayedintable1.Ineffect,theseattributesdefinetheservicebeingoffered.Thevaluesandtheassociatedcompliancetestscanbefoundinthesubsequentclauses.Table1:ConnectionattributesD140UD140SConnectiontypeattributesValue/natureTransferrate-leasedlinetiming-informationtransferrate139264kbit/s±15ppm139264kbit/s±15ppm139264kbit/s±15ppm138240kbit/s±15ppmInformationtransfersusceptanceUnrestricteddigitalStructureUnstructuredFrameintegrityEstablishmentofconnectionWithoutuserinterventionSymmetrySymmetricalinbothdirectionsConnectionconfigurationPoint-to-pointTransmissiondelay-terrestrial(fordistanceGinkm)-satellite≤(10+0,01G)ms≤350msJitteratinputport0,4UIfrom200Hzto500Hz0,075UIfrom10kHzto3500kHzJitteratoutputport1,5UIfrom200Hzto3500kHz0,075UIfrom10kHzto3500kHzAvailabilityNorequirementErrorparametersD140UandD140STerrestrialSatelliteEnd-to-endperformanceobjectives-ErroredSecondsRatio(ESR)-SeverelyErroredSecondsRatio(SESR)-BackgroundBlockErrorRatio(BBER)≤8,00%≤0,10%≤0,01%≤12,480%≤0,156%≤0,016%Performancelevelsovera24hourperiod-ErroredSeconds(ES)-SeverelyErroredSeconds(SES)-BackgroundBlockErrors(BBE)≤6746≤68≤68594≤10575≤112≤1071704.1.1Transferrate4.1.1.1LeasedlinetimingRequirement:Theleasedlineshallbecapableofcarryingusertimingwithintherangeof139264kbit/s±15ppm.Theleasedlineprovidermayalsooffertotheuserincertaininstallationsthecapabilityfortheleasedlinetobesynchronizedtonetworktiming.NOTE:Networktimingistimingthatisderivedfromthesourceorsourcesoftimingthatareusedforthenetwork(i.e.anationalprimaryreferenceclock).Thusthetimingprovidedbytheleasedlinewillbesimilartothatprovidedbyotherdigitalservices.Test:ThetestshallbeconductedaccordingtoclauseA.2.1.SIST EN 300 688 V1.2.1:2003



ETSIETSIEN300688V1.2.1(2001-07)104.1.1.2InformationtransferrateRequirement:Theconnectionshallbecapableoftransferringanominalinformationrate,definedintable2.Table2:InformationtransferrateD140UD140SInformationtransferrate139264kbit/s±15ppm138240kbit/s±15ppmTest:ThetestshallbeconductedaccordingtoclauseA.2.1.4.1.2InformationtransfersusceptanceRequirement:Theconnectionshallbecapableoftransferringunrestricteddigitalinformationwithbitsequenceintegrityatthenominalrate,definedintable3.Table3:InformationtransfersusceptanceD140UD140SInformationtransfersusceptance139264kbit/s±15ppm138240kbit/s±15ppmTest:ThetestshallbeconductedaccordingtoclauseA.2.1.4.1.3Structure4.1.3.1FrameintegrityTherequirementofthisclauseappliesonlytotheD140Sstructuredleasedline.Requirement:WhenasignalwiththestructuredefinedinannexBisappliedtotheinputoftheD140Sleasedline,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(D140UandD140S)andthesameframestructure(D140S).Test:ThetestshallbeconductedaccordingtoclauseA.2.1.SIST EN 300 688 V1.2.1:2003



ETSIETSIEN300688V1.2.1(2001-07)114.1.5NetworkperformanceThenetworkperformancesub-attributesaredisplayedintable1.Thevaluesandtheassociatedcompliancetestscanbefoundinthesubsequentclauses.4.1.5.1TransmissiondelayRequirement:Therequirementdependsuponwhethersatellitetransmissionisinvolvedintheconnectionornot:a)forconnectionswheresatellitetransmissionisnotinvolved,theonewayend-to-enddelayshallbelessthanorequalto(10+0,01G)ms,whereGisthegeographicaldistanceinkilometres,asshowninfigure1;orDelay(ms)Geographicaldistance(km)1000900030006000100Figure1:Upperlimitofdelayb)forconnectionswheresatellitetransmissionisinvolved,theonewayend-to-enddelayshallbelessthanorequalto350ms.NOTE:Requirementsa)andb)arebasedonITU-TRecommendationG.114,clausesA.2andA.3(seeannexF).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 300 688 V1.2.1:2003



ETSIETSIEN300688V1.2.1(2001-07)12Table4:ComponentsofinputjitterFiltersforgenerationofjitterspectrum(firstorder)BandpassfilterformeasurementofinputjitterInputjittermeasuredbybandpassfilterLowercut-off(highpass)Uppercut-off(lowpass)(lowercut-offfirstorder)UnitInterval(UI)peak-to-peak(maximum)200Hz500Hz200Hzto3500kHz0,410kHz3500kHz10kHzto3500kHz0,075Test:ThetestshallbeconductedaccordingtoclauseA.2.3.4.1.5.2.2MaximumjitteratthenetworkoutputportRequirement:Themaximumjitterattheoutputportofthenetworkshallnotexceedthelimitsspecifiedintable5,basedonITU-TRecommendationG.823(seeannexF),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)200Hz3500kHz1,510kHz3500kHz0,075Test:ThetestshallbeconductedaccordingtoclauseA.2.3.4.1.5.3ErrorperformanceErroredseconds,severelyerroredsecondsandbackgroundblockerrorsshallbeexcludedfromthemeasurementoftheerrorperformanceiftheleasedlineisintheunavailablestate.NOTE:Whenmicrowavelinksareusedintheconnectionitmaynotbepossibletomeettherequirementinrareperiodswithveryadversepropagationconditions.Theend-to-enderrorperformanceratesfora140Mbit/sdigitalleasedlineusingterrestrialorsatelliteconnectionsareshownintable6.ThesearebasedonthereferenceconnectionsshowninannexCderivedfromITU-TRecommendationG.826(seeannexF)andarevalidforblocksizesof6000to20000bits.Table6:Endtoenderrorperformanceobjectivesfora140Mbit/sdigitalleasedlinePerformanceparameterTerrestrialSatelliteESR8,00%12,480%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 300 688 V1.2.1:2003



ETSIETSIEN300688V1.2.1(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:Theperformanceofaleasedlineeitherinserviceortakenoutorserviceinordertoperformanerrorperformancemeasurement,shallmeettherequirementsgivenintable7.Table7:Performancelevelsover24hourperiodforablocklengthof17408bitsParameterTerrestrialSatelliteES≤6746≤10575SES≤68≤112BBE≤68594≤107170Test:ThetestshallbeconductedaccordingtoclauseA.2.4.4.1.5.4AvailabilityThereisnorequirementonavailabilityunderthepresentdocument.NOTE1:AnnexDprovidesguidelinesonanapproachtothespecificationofavailabilityvalues.NOTE2:Atpresentsomeleasedlineprovidersincludeavailabilityperformance,definedonanindividualbasisasaqualityofserviceparameter,aspartofthecontractedsupplyconditionsfortheirleasedlineofferings.SIST EN 300 688 V1.2.1:2003



ETSIETSIEN300688V1.2.1(2001-07)14AnnexA(normative):TestmethodsA.1GeneralThisannexdescribesthetestprinciplestodeterminethecomplianceofaconnectionagainsttherequirementsofthepresentdocument.Itisoutsidethescopeofthisannextoidentifythespecificdetailsoftheimplementationofthetests.Detailsoftestequipmentaccuracyandthespecificationtoleranceofthetestdevicesarenotincludedinallcases.Wheresuchdetailsareprovidedtheyshallbecompliedwith,butthewaytheyareexpressedshallnotconstrainthemethodofimplementingthetest.NOTE:Attentionisdrawntotheissueofmeasurementuncertaintywhichmaybeaddressedinfuturedocuments.Notalltherequiredtestresultsmakeallowanceforspuriouseventsduringtesting(e.g.errorsduetoEMCeffects),whichmaymakeitnecessarytorepeatatest.Thetestconfigurationsgivendonotimplyaspecificrealizationofthetestequipmentortestarrangement,ortheuseofspecifictestdevices.However,anytestconfigurationusedshallprovidethosetestconditionsspecifiedunder"connectionstate","stimulus"and"monitor"foreachindividualtest.Thetestequipmentshallbeadevice,orgroupofdevicesthatiscapableofgeneratingastimulussignalconformingtoEN300686[1]andcapableofmonitoringthesignalreceivedfromthenetworkinterface.A.1.1EquipmentconnectionTestingshallbeperformedatthedefinedNTPasthisisthepointatwhichcompliancewithth
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