SIST EN 302 084 V1.1.1:2003
(Main)Transmission and Multiplexing (TM); The control of jitter and wander in transport networks
General Information
- Abstract
This ETS will define the parameters and the relevant values that are required to satisfactorily control the amount of jitter and wander present at digital data interfaces. This ETS is applicable to both SDH and PDH based transport networks.
- 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 302 084 V1.1.1:2003 sets out essential parameters and values for controlling the amount of jitter and wander at digital data interfaces within transport networks. Issued by the Slovenski inštitut za standardizacijo (SIST), this standard is aligned with EN 302 084 and supports both Synchronous Digital Hierarchy (SDH) and Plesiochronous Digital Hierarchy (PDH) based transport networks. Proper management of jitter and wander is critical for maintaining signal integrity, minimizing errors, and ensuring reliable network operations.
Jitter and wander, forms of timing variation in digital signals, can severely impact quality of service by introducing bit errors, slips, and phase irregularities. This standard details limits for output jitter and wander, and also defines the minimum tolerance levels that equipment interfaces must meet to maintain robust data transmission and synchronization.
Key Topics
- Jitter and Wander Control: Key parameters and values to effectively monitor and manage jitter and wander in SDH and PDH interfaces.
- Network Interface Requirements: Defines both network-network interface (NNI) and user-network interface (UNI) requirements to ensure service quality across different network configurations.
- Performance Metrics: Utilizes Maximum Relative Time Interval Error (MRTIE) as the primary measure for specifying wander, aligning equipment performance with international best practices.
- Measurement Methodologies: Reference to standard measurement approaches and recommended instrumentation for quantifying jitter and wander, ensuring uniformity and comparability.
- Input Tolerance: Ensures equipment is capable of handling prescribed jitter and wander levels without performance degradation, alarms, or errors.
Applications
Implementing SIST EN 302 084 V1.1.1:2003 brings practical benefits to organizations working in the telecommunications sector:
- Transport Network Design and Compliance: Network architects and engineers rely on this standard to design transport networks that comply with SDH/PDH standards for jitter and wander, ensuring interoperability and high quality-of-service.
- Equipment Manufacturing: Vendors use these guidelines to develop digital multiplexers, demultiplexers, cross-connects, and line systems that meet rigorously defined jitter and wander tolerances, improving market acceptance and reliability.
- Network Operations: Operators and service providers apply these parameters to monitor network health, minimize incidents related to timing faults, and guarantee service continuity for both digital and analog payloads.
- Testing and Quality Assurance: Laboratories and certification authorities follow specified methodologies for testing and verifying the compliance of network elements, ensuring transparent equipment validation processes.
Related Standards
For comprehensive control and synchronization within digital transport networks, reference is made to several related standards:
- ETS 300166: Covers physical and electrical characteristics for PDH and SDH interfaces.
- ETS 300232: Defines optical interface requirements for SDH equipment.
- ETS 300337: Addresses frame structures for various hierarchical bit rates, relevant for both PDH and SDH.
- EN 300462 series: Provides generic requirements for synchronization networks, including timing characteristics and jitter/wander control for key interfaces.
- ITU-T Recommendations:
- G.803: Architecture for SDH-based transport networks.
- O.150, O.171, O.172: International guidelines for jitter and wander measurement, instrumentation, and methodologies.
- G.703: Specifies the physical/electrical characteristics of hierarchical digital interfaces.
By adhering to SIST EN 302 084 V1.1.1:2003 and its referenced documents, stakeholders ensure international compatibility, reliable network synchronization, and enduring quality of digital signal transmission across modern transport networks.
Keywords: jitter and wander control, SDH, PDH, transport network synchronization, network interface, digital signal integrity, telecommunications standard, synchronization limits, measurement methodologies.
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Frequently Asked Questions
SIST EN 302 084 V1.1.1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Transmission and Multiplexing (TM); The control of jitter and wander in transport networks". This standard covers: This ETS will define the parameters and the relevant values that are required to satisfactorily control the amount of jitter and wander present at digital data interfaces. This ETS is applicable to both SDH and PDH based transport networks.
This ETS will define the parameters and the relevant values that are required to satisfactorily control the amount of jitter and wander present at digital data interfaces. This ETS is applicable to both SDH and PDH based transport networks.
SIST EN 302 084 V1.1.1:2003 is classified under the following ICS (International Classification for Standards) categories: 33.040.20 - Transmission systems. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 302 084 V1.1.1:2003 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.Prenos in multipleksiranje (TM) – Obvladovanje trepetanja in zdrsavanja v prenosnih omrežjihTransmission and Multiplexing (TM); The control of jitter and wander in transport networks33.040.20Prenosni sistemTransmission systemsICS:Ta slovenski standard je istoveten z:EN 302 084 Version 1.1.1SIST EN 302 084 V1.1.1:2003en01-december-2003SIST EN 302 084 V1.1.1:2003SLOVENSKI
STANDARD
ETSIEN302084V1.1.1(2000-02)EuropeanStandard(Telecommunicationsseries)TransmissionandMultiplexing(TM);ThecontrolofjitterandwanderintransportnetworksSIST EN 302 084 V1.1.1:2003
ETSIETSIEN302084V1.1.1(2000-02)2ReferenceDEN/TM-01067Keywordscontrol,performance,transmission,synchronization,interface,transportETSIPostaladdressF-06921SophiaAntipolisCedex-FRANCEOfficeaddress650RoutedesLucioles-SophiaAntipolisValbonne-FRANCETel.:+33492944200Fax:+33493654716SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88Internetsecretariat@etsi.frIndividualcopiesofthisETSIdeliverablecanbedownloadedfromhttp://www.etsi.orgIfyoufinderrorsinthepresentdocument,sendyourcommentto:editor@etsi.frImportantnoticeThisETSIdeliverablemaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.CopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.SIST EN 302 084 V1.1.1:2003
ETSIETSIEN302084V1.1.1(2000-02)3ContentsIntellectualPropertyRights.5Foreword.5Introduction.51Scope.62References.63Definitionsandabbreviations.73.1Definitions.73.2Abbreviations.84Networkwanderspecification.94.1Wanderreferencemodel.94.2SpecificationofwanderbyMRTIEparameter.105Networklimitsforoutputjitterandwander.105.1Networklimitsforoutputjitter.105.2Networklimitsforoutputwander.115.2.12048kbit/sinterfaceoutputwanderlimit.125.2.234368kbit/sinterfaceoutputwanderlimit.135.2.3139264kbit/sinterfaceoutputwanderlimit.135.2.4STM-Ninterfaceoutputwanderlimit.146Jitterandwandertoleranceofequipmentinterfaces.146.164kbit/sinputjitterandwandertolerance.156.22048kbit/sinputjitterandwandertolerance.166.38448kbit/sinputjitterandwandertolerance.176.434368kbit/sinputjitterandwandertolerance.186.5139264kbit/sinputjitterandwandertolerance.196.6STM-Ninputjitterandwandertolerance.20AnnexA(informative):WanderlimitconsiderationsforSDHtransportnetworks.24A.1Introduction.24A.1.1WanderreferencemodelforSDH.24A.1.2Sourcesofwander.25A.1.3Wanderaccumulationlimitingeffects.25A.1.4Networkconfigurationandperformance.25A.1.5Correlationofwandersources.26A.1.6Networkconditionsfortheoutputwanderlimits.26A.2Derivationofwanderspecificationlimits.26AnnexB(informative):Measurementmethodologiesforoutputwander.28B.1Synchronizationinterfaces.28B.1.1Synchronoussignals(SDHandPDHbit-rates).28B.2Trafficinterfaces.28B.2.1Synchronoussignals(PDHbit-rates).29B.2.2Asynchronoussignals(PDHbit-rates).29B.2.2.1Asynchronoussignals,sourcereferenceclockavailable.29B.2.2.2Asynchronoussignals,sourcereferenceclockunavailable.30SIST EN 302 084 V1.1.1:2003
ETSIETSIEN302084V1.1.1(2000-02)4AnnexC(informative):Measurementguidelinesforinputjitterandwandertoleranceofequipmentinterfaces.32AnnexD(informative):Relationbetweenparametersforinputjittertoleranceandoutputjitterlimits.34History.36SIST EN 302 084 V1.1.1:2003
ETSIETSIEN302084V1.1.1(2000-02)5IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinSR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://www.etsi.org/ipr).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinSR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbyETSITechnicalCommitteeTransmissionandMultiplexing(TM).NationaltranspositiondatesDateofadoptionofthisEN:21January2000DateoflatestannouncementofthisEN(doa):30April2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31October2000DateofwithdrawalofanyconflictingNationalStandard(dow):31October2000IntroductionInatransportnetwork,jitterandwanderaccumulateondatapathsaccordingtothejitterandwandergenerationandtransfercharacteristicsofeachequipmentinterconnected.Theseequipmentsmaybedifferenttypesofmultiplexers/demultiplexers,cross-connectsandlinesystems,forexample.Anexcessiveamountofjitterandwandercanadverselyaffectbothdigitalsignals(e.g.bygenerationofbiterrors,uncontrolledslipsandotherabnormalities)andanaloguesignals(e.g.byunwantedphasemodulationofthetransmittedsignal).Theconsequencesofsuchimpairmentwill,ingeneral,dependontheparticularservicethatisbeingcarriedandtheterminatingoradaptationequipmentinvolved.Itisthereforenecessarytosetlimitsonthemagnitudeofjitterandwanderatnetworkinterfaces,inordertoguaranteeaproperqualityofthetransmittedsignalsandaproperdesignoftheequipment.Thejitterandwandercontrolphilosophyofthepresentdocumentisbasedontheneed:•tospecifyamaximumnetworklimitofjitterandwanderthatshouldnotbeexceededatanyrelevantinterface;•tospecifyaminimumequipmenttolerancetojitterandwanderthatshouldbeprovidedatanyrelevantinterface;•toestablishaconsistentframeworkforthespecificationofindividualdigitalequipmenttypes;and•toprovidesufficientinformationandguidelinesfororganizationstomeasureandstudyjitterandwandercharacteristicsinanynetworkconfiguration.SIST EN 302 084 V1.1.1:2003
ETSIETSIEN302084V1.1.1(2000-02)61ScopeThepresentdocumentspecifiestherelevantparametersandtheirlimitingvaluesthatareabletosatisfactorilycontroltheamountofjitterandwanderpresentatsynchronousdigitalhierarchy(SDH)andplesiochronousdigitalhierarchy(PDH)network-networkinterfaces(NNI).ThepresentdocumentalsoprovidestheminimumjitterandwanderrequirementsatSDHandPDHuser-networkinterfaces(UNI).However,particularterminalsorservicesmayhaveadditionaljitterandwanderrequirementsandinthosecasestherelevantstandardsapply.Thejitterandwanderrequirementsspecifiedinthepresentdocumentareapplicabletotheinterfacesirrespectiveofthetransportmechanism(PDH,SDHorATMnetworks,forexample).Thejitterandwanderrequirementsforaninterfacewillbedifferent,dependingonwhetherthesignalattheinterfaceisusedtotransportdataonly,orsynchronizationaswell.TherequirementsforsynchronizationinterfacesarespecifiedinEN300462-3-1[7]andreferenceismadetothatdocumentwhereappropriate.ThepresentdocumentalsospecifiesthejitterandwanderrequirementsforinterfacesusingthegenericframestructuresatPDHratesasdescribedinETS300337[3].TheelectricalcharacteristicsoftherelevantnetworkinterfacesforSDHandPDHinterfacesaredescribedinspecificationETS300166[1]andthecharacteristicsofSDHopticalinterfacesaredescribedinspecificationETS300232[2].2ReferencesThefollowingdocumentscontainprovisions,which,throughreferenceinthistext,constituteprovisionsofthepresentdocument.•Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.•Foraspecificreference,subsequentrevisionsdonotapply.•Foranon-specificreference,subsequentrevisionsdoapply.•Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.[1]ETS300166:"TransmissionandMultiplexing(TM);Physicalandelectricalcharacteristicsofhierarchicaldigitalinterfacesforequipmentusingthe2048kbit/s-basedPlesiochronousorSynchronousDigitalHierarchies".[2]ETS300232:"TransmissionandMultiplexing(TM);OpticalinterfacesforequipmentsandsystemsrelatingtotheSynchronousDigitalHierarchy[ITU-TRecommendationG.957(1993),modified]".[3]ETS300337:"TransmissionandMultiplexing(TM);Genericframestructuresforthetransportofvarioussignals(includingAsynchronousTransferMode(ATM)cellsandSynchronousDigitalHierarchy(SDH)elements)attheITU-TRecommendationG.702hierarchicalratesof2048kbit/s,34368kbit/sand139264kbit/s".[4]EN300417-1-1:"TransmissionandMultiplexing(TM);Genericrequirementsoftransportfunctionalityofequipment;Part1-1:Genericprocessesandperformance".[5]EN300462-1-1:"TransmissionandMultiplexing(TM);Genericrequirementsforsynchronizationnetworks;Part1-1:Definitionsandterminologyforsynchronizationnetworks".[6]EN300462-2-1:"TransmissionandMultiplexing(TM);Genericrequirementsforsynchronizationnetworks;Part2-1:Synchronizationnetworkarchitecture".SIST EN 302 084 V1.1.1:2003
ETSIETSIEN302084V1.1.1(2000-02)7[7]EN300462-3-1:"TransmissionandMultiplexing(TM);Genericrequirementsforsynchronizationnetworks;Part3-1:Thecontrolofjitterandwanderwithinsynchronizationnetworks".[8]EN300462-4-1:"TransmissionandMultiplexing(TM);Genericrequirementsforsynchronizationnetworks;Part4-1:TimingcharacteristicsofslaveclockssuitableforsynchronizationsupplytoSynchronousDigitalHierarchy(SDH)andPlesiochronousDigitalHierarchy(PDH)equipment".[9]EN300462-5-1:"TransmissionandMultiplexing(TM);Genericrequirementsforsynchronizationnetworks;Part5-1:TimingcharacteristicsofslaveclockssuitableforoperationinSynchronousDigitalHierarchy(SDH)equipment".[10]EN300462-6-1:"TransmissionandMultiplexing(TM);Genericrequirementsforsynchronizationnetworks;Part6-1:Timingcharacteristicsofprimaryreferenceclocks".[11]ITU-TRecommendationG.803:"Architectureoftransportnetworksbasedonthesynchronousdigitalhierarchy(SDH)".[12]ITU-TRecommendationO.150:"Generalrequirementsforinstrumentationforperformancemeasurementsondigitaltransmissionequipment".[13]ITU-TRecommendationO.171:"Timingjitterandwandermeasuringequipmentfordigitalsystemswhicharebasedontheplesiochronousdigitalhierarchy(PDH)".[14]ITU-TRecommendationO.172:"Jitterandwandermeasuringequipmentfordigitalsystemswhicharebasedonthesynchronousdigitalhierarchy(SDH)".[15]ITU-TRecommendationG.703:"Physical/electricalcharacteristicsofhierarchicaldigitalinterfaces".3Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply.AdditionaldefinitionsrelatingtosynchronizationnetworksareprovidedinEN300462-1-1[5],whilstthearchitecturalprinciplesofsynchronizationnetworksaredescribedinEN300462-2-1[6].trafficinterface:theseinterfacesmaybesynchronous(i.e.normallyPRC-traceable)orasynchronous(e.g.meetingthefrequencyoffsetrequirementsofETS300166[1]).NetworkjitterandwanderlimitsarespecifiedinthepresentdocumentandwanderisspecifiedusingtheMRTIE(MaximumRelativeTimeIntervalError)parameter.Inputjitterandwandertoleranceisalsospecifiedinthepresentdocument.Thisinterfacecategorycanbefurthersub-dividedasfollows:•interfaceisnotabletoprovidesynchronization,andisnotrequiredto.Anexampleisaninterfacesupportingonly34368kbit/sor139264kbit/sPDHsignalsaccordingtoETS300166[1];•interfaceisnotabletoprovidesynchronizationatthedefinedperformancelevel,butneverthelessisusedtoprovidetimingtoothernetworkelementssuchasterminalequipment,remoteconcentrators,etc.Examplesinclude2048kbit/s,34368kbit/sand139264kbit/sPDHsignalsandleasedlinestransportedonSDH,whichmaybesubjecttopointerjustifications.ITU-TRecommendationG.803[11]recommendsthattheseinterfacesarenotusedforsynchronization,butinsomenetworkapplicationsthereislittlealternative;•interfaceisabletoprovidesynchronizationatthedefinedperformancelevel,inwhichcaseitisdefinedtobeasynchronizationinterface.AnexampleisSTM-Ninterfaces.Thissub-categorymayalsoincludeinterfacesusingthegenericframestructuresatPDHratesasdescribedinETS300337[3].SIST EN 302 084 V1.1.1:2003
ETSIETSIEN302084V1.1.1(2000-02)8synchronizationinterface:theseinterfacesaresynchronous(i.e.normallyPRC-traceable)andtheirrequirementsarenotspecifiedinthepresentdocument.ThenetworklimitsforsynchronizationinterfacesarespecifiedusingMTIE(MaximumTimeIntervalError)andTDEV(TimeDeviation)parameterswithvaluesgiveninEN300462-3-1[7].TheinputjitterandwandertoleranceofclockequipmentportsisspecifiedinEN300462-4-1[8](forequipmentcontaininganSSUfunction)andEN300462-5-1[9](forequipmentcontaininganSECfunction).3.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply.AdditionalabbreviationsrelatingtosynchronizationnetworksareprovidedinEN300462-1-1[5].ATMAsynchronousTransferModeCMICodedMarkInversionMRTIEMaximumRelativeTimeIntervalErrorMS-AISMultiplexSectionAlarmIndicationSignalMTIEMaximumTimeIntervalErrorNENetworkElementNNINetwork-NetworkInterfacePDHPlesiochronousDigitalHierarchypk-pkpeak-to-peakPLLPhaseLockedLoopppmpartspermillionPRBSPseudo-RandomBinarySequencePRCPrimaryReferenceClockRTIERelativeTimeIntervalErrorSDHSynchronousDigitalHierarchySECSDHEquipmentClockSSUSynchronizationSupplyUnitSTM-1eSynchronousTransportModule,level1(electricalformatCMI-encodedsignal)STM-NSynchronousTransportModule,levelNTDEVTimeDeviationTIETimeIntervalErrorUIUnitIntervalUIppUnitInterval,peak-to-peakUNIUser-NetworkInterfaceVC-nVirtualContainer,levelnSIST EN 302 084 V1.1.1:2003
ETSIETSIEN302084V1.1.1(2000-02)94Networkwanderspecification4.1WanderreferencemodelWanderisalwaysspecifiedandmeasuredasaRelativeTimeIntervalError(RTIE)betweenthesignalofinterestandsomereferenceclock.However,thereferenceclockagainstwhichtheRTIEisspecifiedormeasureddependsonthetypeofsignalofinterest.Forthepurposesofthepresentdocument,twocasescanbedistinguished.1)AsynchronousPDHconnectionTheappropriatereferenceforspecifyingtheoutputwanderofasynchronousPDHsignalsisthesignalsourceitself.Formeasurementpurposes,sincethatsourceisnotnormallyavailableforuseasthereferenceclock,itcanbesubstitutedbyasuitably-filteredversionoftheoutputsignal.AnnexBhasfurtherinformationregardingthis.Thereferencemodelisillustratedinfigure1.CLKPDHsignalsourceTransportNetworkOutputwanderRTIENOTE:CLKfrequencyoffsetconformstobit-ratespecificationsofITU-TRecommendationG.703[15].Figure1:WanderreferencemodelforasynchronousPDHconnection2)SynchronousPDHconnectionTheappropriatereferenceforspecifyingtheoutputwanderofsynchronousPDHsignals(i.e.most2048kbit/ssignalsaswellassignalsframedaccordingtoETS300337[3])isthenetworkclockreferenceusedatthePDHsignaltermination.Thismeansthatthewanderoftworeferenceclockdistributionnetworksisaddedtotheoutputwandergeneratedbythetransportnetwork.Thereferencemodelisillustratedinfigure2.SSUPDHsignalsourceTransportNetworkOutputwanderSSURTIENOTE1:SSUoutputsconformtoEN300462-3-1[7]networkwanderlimit.NOTE2:BothSSUsaretraceabletoaPRC(butnotnecessarilythesamePRC).Figure2:WanderreferencemodelforsynchronousPDHconnectionSIST EN 302 084 V1.1.1:2003
ETSIETSIEN302084V1.1.1(2000-02)10Althoughforcases1and2,differentwandersourcescontributetothetotaloutputwander,theresultingmeasuredRTIEwillnotbeverydifferent.Thisisduetoalackofcorrelatingeffectsandbecausestatistically-speakingthetransportnetworkwanderisthedominantsourcecomparedwiththesynchronizationnetworkwander.Consequentlythesamenetworklimitshavebeensetforbothcasesinthefollowingoutputwanderspecifications.ThewanderspecificationsofthepresentdocumentareconsistentwiththederivationoflimitsoutlinedforthecaseofSDHnetworktransportinannexA.4.2SpecificationofwanderbyMRTIEparameterThereareseveralparametersinuseforspecifyingwanderinstandardspecifications,suchasMTIEandTDEV.Forthepurposesofthepresentdocument,MRTIE(MaximumRelativeTimeIntervalError)hasbeenselectedbecauseitismostsuitabletoallowderivationofconsequentequipmentperformancespecifications.Forasynchronouspayloads(refertofigure1)theMRTIEspecifiesthewanderaccumulatedbythenetworkrelativetotheinputsignalphase.Thisisreasonablebecauseitprovidesinformationfordesigningthefilterrequiredforanyfilteringofthetransportedsignalclockinordertoachievetherequiredphasestabilityofthepayload.Forsynchronouspayloads(refertofigure2)theMRTIEspecifiesthewanderofthepayloadoutputrelativetotheclockphaseofaninputbuffer(e.g.locatedinanexchange).Thisisreasonablebecauseitprovidesinformationfordesigningthebuffersize.MeasurementmethodologiesusedtomeasuretheMRTIEparameteraredescribedinannexB.5Networklimitsforoutputjitterandwander5.1NetworklimitsforoutputjitterThelimitsgivenintable1representthemaximumpermissiblelevelsofjitteratinterfaceswithinadigitalnetwork.Jitterasmeasuredovera60secondintervalshallnotexceedthelimitsgivenintable1,whenusingthespecifiedmeasurementbandwidths.Thelimitsshallbemetforalloperatingconditionsandregardlessoftheamountofequipmentprecedingtheinterface.Ingeneral,thesenetworklimitsarecompatiblewiththeminimumtolerancetojitterthatallequipment-inputportsarerequiredtoprovide.Thereisacloserelationshipbetweennetworklimitsandinputtolerancesuchthatintermsofspecification,thefrequencybandwidthusedformeasurementandthefrequencybreakpointsusedfortolerance,aredefinedusingthesamefrequencies.Inotherwords,thejittermeasurementfiltercut-offfrequenciesusedintable1havethesamevaluesasthejittertolerancemaskcornerfrequenciesusedinclause6.AnnexDprovidesfurtherinformationaboutthisrelationship.ThefunctionaldescriptionformeasuringoutputjitteratadigitalinterfacecanbefoundinITU-TRecommendationO.172[14].Thehigh-passmeasurementfiltersoftable1haveasingle-ordercharacteristicandaroll-offof20dB/decade.Thelow-passmeasurementfiltershaveamaximally-flat,Butterworthcharacteristicandaroll-offof60dB/decade.FurtherspecificationsforthefrequencyresponseofthejittermeasurementfunctionsuchasmeasurementfilteraccuracyandadditionalallowedfilterpolesaregiveninITU-TRecommendationO.172[14].InstrumentationinaccordancewithITU-TRecommendationsO.172[14]andO.171[13]isappropriateformeasurementofjitterinSDHandPDHsystems,respectively.ITU-TRecommendationO.172[14]includestestsetspecificationsforthemeasurementofSDHtributariesoperatingatPDHbit-rates,wherethetestsetrequirementsaremorestringentthanthoserelatingonlytoPDHsystems.Therefore,instrumentationinaccordancewithITU-TRecommendationO.172[14]shallbeusedatPDHinterfacesinSDHsystems.SIST EN 302 084 V1.1.1:2003
ETSIETSIEN302084V1.1.1(2000-02)11Table1:MaximumpermissiblejitteratinterfacesInterfaceMeasurementbandwidth,-3dBfrequencies(Hz)Peak-to-peakamplitude(UIpp)64kbit/s20to20k0,25(note1)3kto20k0,052048kbit/s20to100k1,518kto100k(note2)0,28448kbit/s20to400k1,53kto400k(note2)0,234368kbit/s100to800k1,510kto800k0,15139264kbit/s200to3,5M1,510kto3,5M0,075STM-1e500to1,3M1,5(note3)65kto1,3M0,075STM-1500to1,3M1,565kto1,3M0,15STM-41kto5M1,5250kto5M0,15STM-165kto20M1,51Mto20M0,15STM-6420kto80M1,54Mto80M(note4)NOTE1:Fortheco-directionalinterfaceonly.NOTE2:For2048kbit/sand8448kbit/sinterfaceswithinthenetworkofanoperator,thehigh-passcut-offfrequencymaybespecifiedtobe700Hz(insteadof18kHz)and80kHz(insteadof3kHz)respectively.However,atinterfacesbetweendifferentoperatornetworks,thevaluesinthetableapply,unlessinvolvedpartiesagreeotherwise.NOTE3:ElectricalformatCMI-encoded,accordingtoETS300166[1].NOTE4:Avalueof0,15UIpphasbeenproposed.Theeffectofdispersionandnon-linearitiesontheeyeopeningandonthechoiceofthisvalueisforfurtherstudy.NOTE5:UIUnitInterval:64kbit/s1UI=15,6µs2048kbit/s1UI=488ns8448kbit/s1UI=118ns34368kbit/s1UI=29,1ns139264kbit/s1UI=7,18nsSTM-11UI=6,43nsSTM-41UI=1,61nsSTM-161UI=0,402nsSTM-641UI=0,100ns5.2NetworklimitsforoutputwanderTheMRTIEspecificationsgiveninthisclauseareintendedforapplicationtobothsynchronous(i.e.normallyPRC-traceable)andasynchronous(e.g.liabletoafrequencyoffset)PDHinterfacesofETS300166[1],refertofigure1andfigure2,respectively,forthereferencenetworkconfigurations.Itisrequiredthat,withinasynchronizednetwork,digitalequipmentprovidedatnodesshallaccommodatepermittedphasedeviationsontheincomingsignal,i.e.undernormalsynchronizedconditions,impairmentswillnotoccur.However,itshouldberecognizedthat,asaresultofsomeperformancedegradations,failureconditions,maintenanceactionsandotherevents,theRTIEbetweentheincomingsignalandtheinternaltimingsignaloftheterminatingequipmentmayexceedthejitterandwandertoleranceoftheequipmentwhichmayresultinanabnormaleventsuchasacontrolledsliporbit-errorburst.SIST EN 302 084 V1.1.1:2003
ETSIETSIEN302084V1.1.1(2000-02)12Inaddition,atanodewhichconnectstoanindependently-synchronizednetwork(orwhereplesiochronousoperationisusedinnationalnetworks),theRTIEbetweentheincomingsignalandtheinternaltimingsignaloftheterminatingequipmentmayeventuallyexceedthejitterandwandertoleranceoftheequipmentinwhichcaseanabnormaleventsuchasacontrolledslipmayoccur.Themaximumpermissiblelong-termmeancontrolledsliprateresultingfromthismechanismisderivedfromtheclockperformancedefinedinEN300462-6-1[10],i.e.nomorethanoneslipin70days.Thewandermeasurementrequirements(e.g.samplingtimeandmeasurementinterval)forMTIE,MRTIEandTDEVparameters,the10HzwandermeasurementfiltercharacteristicandthefunctionaldescriptionformeasuringoutputwanderaredescribedinITU-TRecommendationO.172[14].InstrumentationinaccordancewithITU-TRecommendationO.172[14]isappropriateformeasurementofwanderparametersatbothSDHandPDHinterfaces.MeasurementmethodologiesusedtomeasuretheMRTIEparameteraredescribedinannexB.5.2.12048kbit/sinterfaceoutputwanderlimitThemaximumlevelofwanderthatmayexistata2048kbit/snetworkinterface,expressedinMRTIE,shallnotexceedthelimitgivenintable2.Theresultantoverallspecificationisillustratedinfigure3.Table2:2048kbit/sinterfaceoutputwanderlimitObservationIntervalττττ(sec)MRTIErequirement0,05<τ≤0,246τµs0,2<τ≤329µs32<τ≤640,28τµs64<τ≤1000(note)18µsNOTE:Fortheasynchronousconfiguration(refertofigure1),themaximumobservationintervaltobeconsideredis80seconds.0,010,11101001000ObservationIntervalτ
(sec)0,1110100MRTIE(µ
sec)Figure3:2048kbit/sinterfaceoutputwanderlimitSIST EN 302 084 V1.1.1:2003
ETSIETSIEN302084V1.1.1(2000-02)135.2.234368kbit/sinterfaceoutputwanderlimitThemaximumlevelofwanderthatmayexistata34368kbit/snetworkinterface,expressedinMRTIE,shallnotexceedthelimitgivenintable3.Theresultantoverallspecificationisillustratedinfigure4.34368kbit/ssignalscanbeframedinaccordancewithETS300337[3];inthecasewhentheseareusedasasynchronizationinterface,theoutputwanderlimitisforfurtherstudy.Table3:34368kbit/sinterfaceoutputwanderlimitObservationIntervalττττ(sec)MRTIErequirement0,05<τ≤0,07314τµs0,073<τ≤2,51µs2,5<τ≤100,4τµs10<τ≤804µs0,010,1110100ObservationIntervalτ (sec)0,1110MRTIE(µ sec)Figure4:34368kbit/sinterfaceoutputwanderlimit5.2.3139264kbit/sinterfaceoutputwanderlimitThemaximumlevelofwanderthatmayexistata139264kbit/snetworkinterface,expressedinMRTIE,shallnotexceedthelimitgivenintable4.Theresultantoverallspecificationisillustratedinfigure5.139264kbit/ssignalscanbeframedinaccordancewithETS300337[3];inthecasewhentheseareusedasasynchronizationinterface,theoutputwanderlimitisforfurtherstudy.Table4:139264kbit/sinterfaceoutputwanderlimitObservationIntervalττττ(sec)MRTIErequirement0,05<τ≤0,156,8τµs0,15<τ≤2,51µs2,5<τ≤100,4τµs10<τ≤804µsSIST EN 302 084 V1.1.1:2003
ETSIETSIEN302084V1.1.1(2000-02)140,010,1110100ObservationIntervalτ (sec)0,1110MRTIE(µ sec)Figure5:139264kbit/sinterfaceoutputwanderlimit5.2.4STM-NinterfaceoutputwanderlimitSTM-Ninterfacesaredefinedassynchronizationinterfaces,andthenetworklimitsforwanderatsynchronizationinterfacesarespecifiedinEN300462-3-1[7].6JitterandwandertoleranceofequipmentinterfacesInordertoensurethat,ingeneral,anyequipmentcanbeconnectedtoanyappropriateinterfacewithinanetwork,itisnecessarytoarrangethattheinputportsofallequipmentarecapableofaccommodatinglevelsofjitterandwanderuptoatleasttheminimumlimitsdefinedinthefollowingclauses.ThejitterandwandertoleranceofanSDHorPDHinterfaceindicatestheminimumlevelofphasenoisethattheinputportshallaccommodatewhilst:•notcausinganyalarms;•notcausinganyslips;and•notcausinganybiterrors;exceptforopticalSTM-NinterfacesatjitterfrequenciesabovefP,(refertotable12,table13andtable14)whereanequivalent1dBopticalpowerpenaltyshallnotbeexceeded.Alldigitalinputportsofequipmentshallbeabletotolerateadigitalsignalthathas:•electricalcharacteristicsinaccordancewiththerequirementsofETS300166[1]ortheopticalcharacteristicsofETS300232[2];•aconstantfrequencyoffset(relativetothenominalvalue)intherangedefinedintable5;•arateofchangeinfrequencyuptoatleast0,5ppm/minuteforallSTM-Ninterfaces;and•asinusoidalphasedeviationhavinganamplitude-frequencyrelationshipdefinedinthefollowingclauseswhichindicatestheappropriatelimitsforthedifferentinterfaces.Inprinciple,theserequirementsshallbemetregardlessoftheinformationcontentofthedigitalsignal.However,fortestpurposes,thecontentofthesignalwithjitterandwandermodulationshouldbeastructuredtestsequenceasdefinedinthefollowingclauses.SIST EN 302 084 V1.1.1:2003
ETSIETSIEN302084V1.1.1(2000-02)15Whenspecifyingorassessinginterfacetolerance,twoequipmentoperatingconditionscanbedistinguished:•non-synchronizedoperation,wherethereceivingequipmentisnotbeingtimedfromasourcethatissynchronouswiththeinterfaceunderconsideration.Inthiscase,itistheequipmentcapabilitytoaccommodatephasevariationontheincomingsignal(intermsofclockrecoverycircuitryandsynchronizer/desynchronizerbuffers)thatisofinterest;•synchronizedoperation,wherethereceivingequipmentisbeingtimedfromasourcethatissynchronouswith
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