ETSI EN 300 462-2-1 V1.2.1 (2002-06)

Transmission and Multiplexing (TM); Generic requirements for synchronization networks; Part 2-1: Synchronization network architecture based on SDH networks

REN/TM-01092

Prenos in multipleksiranje (TM) – Generične zahteve za sinhronizacijska omrežja – 2-1. del: Arhitektura sinhronizacijskih omrežij, ki temelji na omrežjih SDH

General Information

• Status: Published
• Publication Date: 02-Jun-2002
• Technical Committee: TM 1 - TM Core networks, fibres and cables
• Current Stage: 12 - Completion
• Due Date: 07-Jun-2002
• Completion Date: 03-Jun-2002
• Ref Project: SIST EN 300 462-2-1 V1.2.1:2003 - Transmission and Multiplexing (TM); Generic requirements for synchronization networks; Part 2-1: Synchronization network architecture based on SDH networks

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Transmission and Multiplexing (TM); Generic requirements for synchronization networks; Part 2-1: Synchronization network architecture based on SDH networks33.040.20Prenosni sistemTransmission systemsICS:Ta slovenski standard je istoveten z:EN 300 462-2-1 Version 1.2.1SIST EN 300 462-2-1 V1.2.1:2003en01-december-2003SIST EN 300 462-2-1 V1.2.1:2003SLOVENSKI
STANDARD



SIST EN 300 462-2-1 V1.2.1:2003



ETSIEN300462-2-1V1.2.1(2002-06)EuropeanStandard(Telecommunicationsseries)TransmissionandMultiplexing(TM);Genericrequirementsforsynchronizationnetworks;Part2-1:SynchronizationnetworkarchitecturebasedonSDHnetworksSIST EN 300 462-2-1 V1.2.1:2003



ETSIETSIEN300462-2-1V1.2.1(2002-06)2ReferenceREN/TM-01092Keywordsarchitecture,SDH,synchronization,transmissionETSI650RoutedesLuciolesF-06921SophiaAntipolisCedex-FRANCETel.:[phone]Fax:[phone]SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88ImportantnoticeIndividualcopiesofthepresentdocumentcanbedownloadedfrom:http://www.etsi.orgThepresentdocumentmaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.Usersofthepresentdocumentshouldbeawarethatthedocumentmaybesubjecttorevisionorchangeofstatus.InformationonthecurrentstatusofthisandotherETSIdocumentsisavailableathttp://portal.etsi.org/tb/status/status.aspIfyoufinderrorsinthepresentdocument,sendyourcommentto:[e-mail]opartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2002.Allrightsreserved.DECTTM,PLUGTESTSTMandUMTSTMareTradeMarksofETSIregisteredforthebenefitofitsMembers.TIPHONTMandtheTIPHONlogoareTradeMarkscurrentlybeingregisteredbyETSIforthebenefitofitsMembers.3GPPTMisaTradeMarkofETSIregisteredforthebenefitofitsMembersandofthe3GPPOrganizationalPartners.SIST EN 300 462-2-1 V1.2.1:2003



ETSIETSIEN300462-2-1V1.2.1(2002-06)3ContentsIntellectualPropertyRights.4Foreword.41Scope.62References.63Definitionsandabbreviations.73.1Definitions.73.2Abbreviations.74Synchronizationmethods.75Functionaldescriptionofclocktypes.85.1PrimaryReferenceClock(PRC).85.2SynchronizationSupplyUnit(SSU).85.3SDHEquipmentClock(SEC).96Synchronizationnetworkarchitecture.107Synchronizationmodes.118Synchronizationnetworkreferencechain.129Synchronizationnetworkevolution.149.1SDHnetworks.149.2OpticalTransportNetworks.1410Synchronizationnetworkrobustness.1410.1General.1410.2Trailredundancy.1410.3Synchronizationstatusmessage.1510.4Management.15AnnexA(informative):Bibliography.16History.17SIST EN 300 462-2-1 V1.2.1:2003



ETSIETSIEN300462-2-1V1.2.1(2002-06)4IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinETSISR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://webapp.etsi.org/IPR/home.asp).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinSR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbyETSITechnicalCommitteeTransmissionandMultiplexing(TM).Thepresentdocumenthasbeenproducedtoproviderequirementsforsynchronizationnetworksthatarecompatiblewiththeperformancerequirementsofdigitalnetworks.Itisoneofafamilyofdocumentscoveringvariousaspectsofsynchronizationnetworks.Thepresentdocumentispart2-1ofamulti-partdeliverablecoveringgenericrequirementsforsynchronizationnetworks,asidentifiedbelow:Part1-1:"Definitionsandterminologyforsynchronizationnetworks";Part2-1:"SynchronizationnetworkarchitecturebasedonSDHnetworks";Part3-1:"Thecontrolofjitterandwanderwithinsynchronizationnetworks";Part4-1:"TimingcharacteristicsofslaveclockssuitableforsynchronizationsupplytoSynchronousDigitalHierarchy(SDH)andPlesiochronousDigitalHierarchy(PDH)equipment";Part4-2:"TimingcharacteristicsofslaveclockssuitableforsynchronizationsupplytoSynchronousDigitalHierarchy(SDH)andPlesiochronousDigitalHierarchy(PDH)equipment;ImplementationConformanceStatement(ICS)proformaspecification";Part5-1:"TimingcharacteristicsofslaveclockssuitableforoperationinSynchronousDigitalHierarchy(SDH)equipment";Part6-1:"Timingcharacteristicsofprimaryreferenceclocks";Part6-2:"Timingcharacteristicsofprimaryreferenceclocks;ImplementationConformanceStatement(ICS)proformaspecification";Part7-1:"Timingcharacteristicsofslaveclockssuitableforsynchronizationsupplytoequipmentinlocalnodeapplications".Part2-1hasbeenrevisedinseveralsectionswithregardtotheworkdoneinEG201793[7]andtoreflectthepresentstatusofsynchronizationnetworks.SIST EN 300 462-2-1 V1.2.1:2003



ETSIETSIEN300462-2-1V1.2.1(2002-06)5NationaltranspositiondatesDateofadoptionofthisEN:31May2002DateoflatestannouncementofthisEN(doa):31August2002DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):28February2003DateofwithdrawalofanyconflictingNationalStandard(dow):28February2003SIST EN 300 462-2-1 V1.2.1:2003



ETSIETSIEN300462-2-1V1.2.1(2002-06)61ScopeThepresentdocumentspecifiesthearchitecturalprinciplesthatshouldbeappliedforthedesignofsynchronizationnetworksthataresuitableforthesynchronizationofSynchronousDigitalHierarchy(SDH)andPlesiochronousDigitalHierarchy(PDH)networks.Itsupportstheconstructionofsynchronizationnetworksthatsupportboththeshort-termstabilityrequirementsofSDHnetworksandthelong-termstabilityrequirementsofdigitalswitchingnetworks(e.g.PSTN)connectedtotheSDHnetwork.Itappliestothedesignofnewsynchronizationnetworks.ItdoesnotcharacterizeexistingsynchronizationnetworksbasedonPDHnetworks.Thepresentdocumentspecifiestherulesandarchitecturalprinciplestheimplementationofsynchronizationnetworksshallfollow.ThisinformationissupplementedbyEG201793[7].Itgivesguidanceandexampleshowtheserulesandarchitecturalprinciplescanbeusedtosetupasynchronizationschemeforvariousnetworkconfigurations.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublicationand/oreditionnumberorversionnumber)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.[1]ETSIEN300462-1-1:"TransmissionandMultiplexing(TM);Genericrequirementsforsynchronizationnetworks;Part1-1:Definitionsandterminologyforsynchronizationnetworks".[2]ETSIEN300462-3-1:"TransmissionandMultiplexing(TM);Genericrequirementsforsynchronizationnetworks;Part3-1:Thecontrolofjitterandwanderwithinsynchronizationnetworks".[3]ETSIEN300147:"TransmissionandMultiplexing(TM);SynchronousDigitalHierarchy(SDH);Multiplexingstructure".[4]ETSIEN300462-5-1:"TransmissionandMultiplexing(TM);Genericrequirementsforsynchronizationnetworks;Part5-1:TimingcharacteristicsofslaveclockssuitableforoperationinSynchronousDigitalHierarchy(SDH)equipment".[5]ETSIEN300462-6-1:"TransmissionandMultiplexing(TM);Genericrequirementsforsynchronizationnetworks;Part6-1:Timingcharacteristicsofprimaryreferenceclocks".[6]ETSIEN300462-4-1:"TransmissionandMultiplexing(TM);Genericrequirementsforsynchronizationnetworks;Part4-1:TimingcharacteristicsofslaveclockssuitableforsynchronizationsupplytoSynchronousDigitalHierarchy(SDH)andPlesiochronousDigitalHierarchy(PDH)equipment".[7]ETSIEG201793:"TransmissionandMultiplexing(TM);Synchronizationnetworkengineering".[8]ETSIEN300462-7-1:"TransmissionandMultiplexing(TM);Genericrequirementsforsynchronizationnetworks;Part7-1:Timingcharacteristicsofslaveclockssuitableforsynchronizationsupplytoequipmentinlocalnodeapplications".[9]ETSIEN300417-6-1:"TransmissionandMultiplexing(TM);Genericrequirementsoftransportfunctionalityofequipment;Part6-1:Synchronizationlayerfunctions".SIST EN 300 462-2-1 V1.2.1:2003



ETSIETSIEN300462-2-1V1.2.1(2002-06)73Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thetermsanddefinitionsgiveninEN300462-1-1[1]apply.3.2AbbreviationsForthepurposesofthepresentdocument,theabbreviationsdefinedinEN300462-1-1[1]andthefollowingapply:ADMAddDropMultiplexerAISAlarmIndicationSignalNENetworkElementOTNOpticalTransportNetworkPDHPlesiochronousDigitalHierarchyppmpartspermillionPRCPrimaryReferenceClockPSTNPublicSwitchedTelephoneNetworkSASEStand-AloneSynchronizationEquipmentSDHSynchronousDigitalHierarchySECSDHEquipmentClockSETGSDHEquipmentTimingGeneratorSETSSDHEquipmentTimingSourceSSUSynchronizationSupplyUnitSSMSynchronizationStatusMessageSTM-NSynchronousTransportModuleN4SynchronizationmethodsMaster-slavesynchronizationisappropriateforsynchronizingSDHnetworksandthefollowingmaterialoffersguidanceonusingthismethod.Master-slavesynchronizationusesahierarchyofclocksinwhicheachlevelofthehierarchyissynchronizedwithreferencetoahigherlevel.Therearefourqualitiesofclockinthesynchronizationhierarchyshownbelow:-PrimaryReferenceClock(PRC):seeEN300462-6-1[5];-slaveclock(transitnode):seeEN300462-4-1[6];-slaveclock(localnode):seeEN300462-7-1[8];-SDHEquipmentClock(SEC):seeEN300462-5-1[4].ThePRCisthehighestqualityhierarchicalclockandtheSECisthelowestqualityclock.Higherqualityclocksshallnotbesynchronizedbylowerqualityclocksinholdovermode,butclocksinholdovermodecanbeusedtosynchronizeclocksofthesamequality.Therearelimitsonthenumberofclocks,whichcanbeconnectedinasynchronizationdistributiontrail(seeclause8).Clockreferencesignalsaredistributedbetweenlevelsofthehierarchyviaadistributionnetwork,whichmayusethefacilitiesofthetransportnetwork.ThetransportnetworkmaycontainSECs.Thedistributionoftimingbetweenhierarchicalnodeclocksshallbeperformedusingamethod,whichavoidsintermediatepointerprocessing.Twopossiblemethodsareasfollows:a)recovertimingfromareceivedSynchronousTransportModuleN(STM-N)signal(thisavoidstheunpredictableeffectofapointeradjustmentonthedownstreamslaveclock);b)derivetimingfromasynchronizationtrailthatisnotsupportedbyaSDHnetwork.Themaster-slavemethodusesasingle-endedsynchronizationtechniquewiththeslaveclockselectingthesynchronizationtrailtobeusedasitsreferenceandchangingtoanalternativeiftheoriginaltrailfails.Thisisaunilateralcontrolscheme.SIST EN 300 462-2-1 V1.2.1:2003



ETSIETSIEN300462-2-1V1.2.1(2002-06)85Functionaldescriptionofclocktypes5.1PrimaryReferenceClock(PRC)ThePRCisalogicalfunctionconformingtotherequirementsofEN300462-6-1[5].Itgeneratesthemasterclockforanetworkorpartofanetwork.ThePRCequipmentmayeither:-implementitsownfreerunningoscillator(e.g.Caesiumtubeoscillator);or-beaslaveclockbeingsynchronizedtoahighaccuracyfreerunningclockbyterrestrialorsatelliteradiosignals(e.g.GPS).5.2SynchronizationSupplyUnit(SSU)ASSUisalogicalfunctionconformingtotherequirementsofEN300462-4-1[6]orEN300462-7-1[8].It:-acceptssynchronizationinputsfromanumberofsources;-selectsoneoftheseinputs;-f
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