SIST EN 302 084 V1.1.1:2003

• 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
• ICS: 33.040.20 - Transmission systems
• 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 302 084 V1.1.1 (2000-02) - Transmission and Multiplexing (TM); The control of jitter and wander in transport networks

SIST EN 302 084 V1.1.1:2003 is the Slovenian adoption of ETSI EN 302 084 Version 1.1.1 from the Transmission and Multiplexing (TM) series. It specifies the parameters and limit values used to control jitter and wander in SDH and PDH transport networks at digital data interfaces, so network operators, equipment designers, and test laboratories can judge interface performance and tolerance.

What does SIST EN 302 084 V1.1.1:2003 specify?

SIST EN 302 084 V1.1.1:2003 sets network limits and equipment tolerance requirements for jitter and wander at SDH and PDH interfaces. It applies to network-network interfaces (NNI) and gives minimum requirements for user-network interfaces (UNI), with separate treatment for data-only interfaces and interfaces used for synchronization.

The document is organized into six clauses and four informative annexes.

Annex	What it covers
Annex A	Wander limit considerations for SDH transport networks
Annex B	Measurement methodologies for output wander
Annex C	Measurement guidelines for input jitter and wander tolerance of equipment interfaces
Annex D	Relation between input jitter tolerance parameters and output jitter limits

Clause 1 states the scope, Clause 2 lists the referenced standards, Clause 3 gives definitions and abbreviations, Clause 4 specifies wander models and the MRTIE parameter, Clause 5 gives output jitter and wander limits, and Clause 6 gives input jitter and wander tolerance masks.

What are the key requirements of SIST EN 302 084 V1.1.1:2003?

SIST EN 302 084 V1.1.1:2003 is built around three practical checks: how to measure wander, what output limits a network interface shall meet, and what input disturbance an equipment port shall tolerate. The key point for users is that the document links network performance limits with equipment design and test conditions.

• Clause 4.1 defines wander with the Relative Time Interval Error (RTIE) reference model. For asynchronous PDH, the reference is the signal source itself; for synchronous PDH, the reference is the local network clock at the termination point. In practice, this tells you which clock to compare against when judging wander.
• Clause 4.2 uses Maximum Relative Time Interval Error (MRTIE) as the wander specification parameter. The document selects MRTIE because it supports deriving filter and buffer requirements for equipment. In practice, MRTIE is the quantity to use when checking transport-network phase stability.
• Clause 5.1 limits output jitter at digital interfaces over a 60-second interval and with specified measurement bandwidths. The same frequency breakpoints are used for output-jitter filters and input-tolerance masks. In practice, the network output test and the equipment-input tolerance test are meant to line up.
• Clause 5.2 sets output wander limits for 2048 kbit/s, 34368 kbit/s, and 139264 kbit/s interfaces using MRTIE versus observation interval. STM-N interfaces are treated as synchronization interfaces and use the synchronization-network limits in EN 300 462-3-1. In practice, the allowed wander depends on the bit rate and on whether the interface carries synchronization.
• Clause 6 requires input ports to tolerate phase noise without alarms, slips, or bit errors, except for optical STM-N cases where an equivalent 1 dB optical power penalty applies above the stated jitter frequency region. It also requires tolerance to defined frequency offsets and to a sinusoidal phase-deviation mask. In practice, equipment has to accept realistic network impairments without failing.
• Clauses 6.1 to 6.6 give rate-specific tolerance masks for 64 kbit/s, 2048 kbit/s, 8448 kbit/s, 34368 kbit/s, 139264 kbit/s, and STM-N. Each clause also identifies the test pattern or test guidance to use. In practice, test results must be compared against the mask for the exact interface rate.

What terms does SIST EN 302 084 V1.1.1:2003 define?

• Traffic interface - An interface that may be synchronous or asynchronous, depending on whether it carries timing from a PRC-traceable source.
• Synchronization interface - A synchronous interface whose limits are not specified in this document but in EN 300 462-3-1 and related parts.
• Relative Time Interval Error (RTIE) - The phase difference used to express wander between the signal of interest and its reference clock.
• Maximum Relative Time Interval Error (MRTIE) - The maximum RTIE over an observation interval, used here as the wander specification parameter.
• Synchronization Supply Unit (SSU) - A network timing element used as the local reference in synchronous PDH wander measurements.
• SDH Equipment Clock (SEC) - The SDH clock source whose phase noise and switching effects are considered in the wander budget.

Who uses SIST EN 302 084 V1.1.1:2003?

SIST EN 302 084 V1.1.1:2003 is used by transport-network operators, SDH and PDH equipment manufacturers, test laboratories, and system integrators. Engineers use it to set interface limits, design filtering and buffer behavior, and choose test methods. Quality managers and buyers use it to check whether a product’s interfaces match the jitter and wander performance expected on an SDH or PDH network.

Which standards are used with SIST EN 302 084 V1.1.1:2003?

Clause 2 links this document to the standards and recommendations that define interface characteristics, synchronization behavior, and measurement methods.

• ETS 300 166 - Physical and electrical characteristics of hierarchical digital interfaces, including frequency-offset conditions.
• ETS 300 232 - Optical interfaces for SDH equipment and systems.
• ETS 300 337 - Generic frame structures at 2048 kbit/s, 34368 kbit/s, and 139264 kbit/s.
• EN 300 417-1-1 - Generic transport functionality of equipment.
• EN 300 462-1-1 / 2-1 - Definitions, terminology, and architecture for synchronization networks.
• EN 300 462-3-1 / 4-1 / 5-1 / 6-1 - Jitter and wander control in synchronization networks, plus timing characteristics of slave clocks and primary reference clocks.
• ITU-T G.803, O.150, O.171, O.172, G.703 - Transport-network architecture, test instrumentation, jitter/wander measuring equipment, and hierarchical digital interface characteristics.

What does the SIST EN 302 084 V1.1.1:2003 document contain?

The document contains limit tables, tolerance masks, reference models, and measurement guidance rather than worked examples. Tables 1 to 15 define jitter bandwidths, output-wander limits, and input-tolerance masks for the different interface rates. Figures 1 to 14 illustrate the reference models and the frequency-dependent tolerance curves.

Annex A explains why the SDH-based wander limits were derived the way they were. Annex B shows how output wander is measured for synchronous and asynchronous signals, including the case where the source reference clock is not available. Annex C gives a generic test set-up for jitter and wander tolerance testing, and Annex D explains how output-jitter limits and input-tolerance masks are related.

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.:[phone]Fax:[phone]SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/[e-mail]ETSIdeliverablecanbedownloadedfromhttp://www.etsi.orgIfyoufinderrorsinthepresentdocument,sendyourcommentto:[e-mail]Ideliverablemaybemadeavailableinmorethanoneelectronicversionorinprint.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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