SIST EN 300 687 V1.2.1:2003

• 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
• ICS: 33.040.50 - Lines, connections and circuits
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI EN 300 687 V1.2.1 (2001-07) - Access and Terminals (AT); 34 Mbit/s digital leased lines (D34U and D34S); Connection characteristics

SIST EN 300 687 V1.2.1:2003 is a Slovenian standard published by Slovenski inštitut za standardizacijo, adopting ETSI EN 300 687 for Access and Terminals. It specifies the connection characteristics and conformance tests for 34 Mbit/s digital leased lines (D34U and D34S) carried through the public network, for network operators, leased line providers, terminal equipment makers and test laboratories.

What does SIST EN 300 687 V1.2.1:2003 specify?

SIST EN 300 687 V1.2.1:2003 specifies the technical requirements and compliance tests for point-to-point 34 Mbit/s digital leased lines. It covers both unstructured service at 34368 kbit/s (D34U) and structured service at 34368 kbit/s with 33920 kbit/s of information capacity plus framing overhead (D34S).

The standard applies to connections presented at Network Termination Points (NTPs) and includes equipment that may provide the NTP. It is written for leased lines that can be established or released without protocol exchange or other user intervention at the NTP.

It is organized into scope, references, definitions and abbreviations, and requirements, followed by annexes with test methods, frame structure, error performance derivation, availability guidance and BIS limits.

Annex	What it covers
A	Test methods for compliance
B	Definition of the 34368 kbit/s frame structure
C	Derivation of error performance limits
D	Availability guidance and target values
E	Bringing Into Service (BIS) limits
F	Bibliography

What are the key requirements of SIST EN 300 687 V1.2.1:2003?

SIST EN 300 687 V1.2.1:2003 uses the ITU-T attribute technique to describe the service. In practice, that means the standard checks rate, structure, symmetry, delay, jitter, error performance and availability as separate service attributes.

Connection and transfer characteristics

The connection must carry the specified bit rate with a tolerance of ±20 ppm, and the information transfer must be unrestricted digital transmission. For D34S, the frame structure must preserve the defined 8 kHz framing and keep the frame alignment bytes in the same position relative to the payload.

The connection must be symmetrical in both transmission directions. For a buyer or engineer, that means both directions must perform to the same service level and the service must not depend on which way traffic flows.

If the input signal is lost, the far-end output must be an Alarm Indication Signal (AIS), all ones. That gives a clear defect indication for fault handling and monitoring.

Network performance

The one-way delay requirement depends on whether satellite transmission is involved. For terrestrial paths, the limit is linked to geographic distance; for satellite paths, the limit is a fixed upper bound. This matters when planning international routes or mixed terrestrial-satellite circuits.

Jitter is specified both at the network input port and the network output port. The input port must tolerate defined jitter components, while the output port must stay within tighter limits. This is what test labs measure to check that the leased line will carry timing-sensitive traffic without excessive distortion.

Error performance is defined using Errored Seconds (ES), Severely Errored Seconds (SES) and Background Block Errors (BBE). The standard gives terrestrial and satellite objectives and 24-hour performance levels, so commissioning and acceptance testing can compare measured results against a defined threshold.

Service monitoring and service state

There is no requirement on Bringing Into Service (BIS) limits in the main requirements, but annex E gives guidance values. There is also no requirement on availability in the main requirements, while annex D provides recommended target values and definitions for service planning.

What terms does SIST EN 300 687 V1.2.1:2003 define?

• Network Termination Point (NTP) - the physical connection point and its technical access specifications at the public network boundary.
• D34U - a 34 Mbit/s digital unstructured leased line.
• D34S - a 34 Mbit/s digital structured leased line with 33920 kbit/s information capacity and framing overhead.
• AIS (Alarm Indication Signal) - an all-ones signal sent when the input signal is lost.
• BBER (Background Block Error Ratio) - the ratio of errored blocks to total blocks, excluding severely errored seconds and unavailability.
• SES (Severely Errored Second) - a one-second period with at least 30% errored blocks or at least one severely disturbed period.
• PRBS (Pseudo Random Bit Sequence) - the test bit pattern used in the conformance methods.

Who uses SIST EN 300 687 V1.2.1:2003?

SIST EN 300 687 V1.2.1:2003 is used by public telecommunications network operators, leased line providers, and manufacturers of terminal equipment that connects at the NTP. It is also used by test laboratories and quality teams that need to verify delay, jitter, framing, error performance and AIS behavior.

In practice, it supports design, type testing, commissioning, fault investigation and acceptance testing for 34 Mbit/s digital leased lines. It is especially relevant where a provider must prove that a connection meets defined transport characteristics through the public network.

What changed in SIST EN 300 687 V1.2.1:2003 from the previous edition?

SIST EN 300 687 V1.2.1:2003 is a revision of ETS 300 687. The stated purpose of the revision is to improve the safety related aspects following a liaison received from TC Safety.

Which standards are used with SIST EN 300 687 V1.2.1:2003?

• ETSI EN 300 686 - provides the network interface presentation and the signal format used by the conformance tests.
• ITU-T Recommendation O.151 - gives error performance measuring equipment at the primary rate and above.
• ITU-T Recommendation O.171 - gives timing jitter and wander measuring equipment for PDH digital systems.

What does the SIST EN 300 687 V1.2.1:2003 document contain?

The document contains the requirement tables for transfer rate, structure, delay, jitter, error performance and service attributes, together with clause-by-clause test references. Annex A gives the test set-ups and stimulus/monitor conditions for timing, delay, jitter, error performance, frame integrity and loss-of-input testing.

Annex B defines the 34368 kbit/s frame structure, including path overhead bytes such as FA1, FA2, EM, TR, MA, NR and GC. Annex C explains how the error performance targets are derived from reference terrestrial and satellite connections, and annex E turns those targets into BIS test limits for 24-hour and 2-hour periods.

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.:[phone]Fax:[phone]SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88ImportantnoticeIndividualcopiesofthepresentdocumentcanbedownloadedfrom:http://www.etsi.orgThepresentdocumentmaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.Usersofthepresentdocumentshouldbeawarethatthedocumentmaybesubjecttorevisionorchangeofstatus.InformationonthecurrentstatusofthisandotherETSIdocumentsisavailableathttp://www.etsi.org/tb/status/Ifyoufinderrorsinthepresentdocument,sendyourcommentto:[e-mail]opartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2001.Allrightsreserved.SIST EN 300 687 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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