OTN原理及关键技术.ppt

PrincipleandKeyTechnologiesofOTN Page2 Chapter1BackgroundandConceptofOTN Contents Chapter2HierarchyofOTN Chapter3G 709Introduction Chapter4OTNkeyTechnologies Chapter5ReviewandOutlook Page3 Chapter1Background ConceptofOTN Section1 BackgroundofOTN Contents Inthenext3to5years newbusinessdevelopmentwilldriverapidgrowthinbusinessvolume Rapidgrowthofnewbusinessbasedbroadbandservicesoflargeparticles Alargenumberbroadbandservicesoflargeparticlesrequireeffectiveschedulingandmanagement improvingtheQoS tomeettheneedsofnetworkoperators Voice Fixed Mobile 4 6X 2005 2010 NetworkDevelopmentunderIP driventrend Broadbandbusinessisboomingwhichproposednewrequirementsonthetransmissionnetwork DataServices ATM FR VPN 2 Page4 PDH SDH TheRoadofTransportNetworkTechnologyEvolution Page5 AnalysisofthedifferentTransmissionTechnology PDH SDH WDM PDH Quasi synchronousdigitalhierarchy ithavebetteradaptabilityforpointtopointcommunication However PDHnetworklackofmanagementcapacity SDH synchronousdigitalhierarchy Ithasmanyadvantages suchasstandardopticalinterface apowerfulnetworkmanagementcapabilities However itcannotprovideuslarge capacityandhigh speed WDM Largebandwidth lowtransmissioncosts adaptingtohigh speedlarge capacitytransmission Butthenetworkisnotflexibleandcannotachieveeffectivemanagement WDM SDH ASON OurCurrentRequirements Page7 Demanddrivestechnologydevelopment SohowcanwehavetheadvantagesofSDHandWDMinthesametime Then OTNcameintobeing Page8 Chapter1Background ConceptofOTN Section2 ConceptofOTN Page9 Contents ConceptofOTN OTNconceptproposed In1998 ITU Tformallyproposedtheconcept andtookitasanidealbasisforfuturenetworkevolution OTN OpticalTransportNetworkOpticalTransportNetwork OTN iscomposedofasetofOpticalNetworkElementsconnectedbyopticalfiberlinks abletoprovidefunctionalityoftransport multiplexing routing management supervisionandsurvivabilityofclientsignals accordingtotherequirementsgiveninRec G 872 AnOpticalTransportNetworkisantransportnetworkbasedonWDMtechnology Itisthenext generationbackbonenetwork Page10 FrameworkofOTN InFebruary1999 G 872 thefirstproposalofOTNwasapproved Nowadays OTNstandardsystemhasbeenimproved ManagementinformationmodelG 874 1 875 ArchitectureaspectsG 872 PhysicallayercharacteristicsG 959 1 692 693 EquipmentmanagementAspectsG 874 7710 Jitter driftperformanceG 8251 OpticalsafetyregulationsG 664 BERG 8201 EquipmentfunctionG 806 G 798 Structure Mapping OverheadG 709 APSG 873 1 808 1 Page11 OTNCharacteristic OTNHierarchydefinedinG 872ComplexframingdefinedinG 709InterfacedefinedinG 709 Includingwavelengthdivisionsideandclientside typicallyusedforinterconnection Reconfigurableopticaladd dropmultiplexerODUkcross OTH Loadcontrolplane Page12 OTNcharacteristic NetworkHierarchyofOTNOPU ODU OTUElectricallayerOCh OMS OTSOpticallayer ROADM OTN Opticallayerandelectricallayerperformancemonitoring Opticallayerperformancemonitoring OTU OTNframestructure OTNincludeselectrical layernetworkandoptical layernetwork Page13 OTNTechnicalSuperiority 1 Full serviceaccessandlargecapacitytransmission 2 Maintenance Management 3 NetworkingandProtection 4 Flexiblegrooming SDH Ethernet IP ATM GFPtransparenttransmissionTbitsleveltransportcapability WealthofoverheadbytesSixlevelsofindependentTandemConnectionMonitoring TCM SupportingtraditionalWDMopticallayerprotectionIntelligentprotectionandrestorationwithMeshnetworks Opticallayercross connectMultiplexerandgroomingsub wavelengthservices ODUk GE ODUkcascadeandvirtualcascade Page14 OTNSuperiority Page15 Contents OTNHierarchicalStructure Theopticallayercanbedividedinto OpticalChannel OCh OpticalMultiplexSection OpticalTransmissionSection OMS OChcanbedividedintothreesub layerelectronicfield OpticalPayloadUnit OPU OpticalDataUnit ODU OpticalTransportUnit OTU Opticallayer Page16 OTNHierarchicalStructure Essentially OTNconsistsoffollowingparts OpticalTransmissionSection OTS OpticalChannel OCh OpticalMultiplexSection OMS OpticalDataUnit ODU OpticalTransportUnit OTU OpticalPayloadUnit OPU Page17 FunctionofOTNeachlayer OTN OCh OMS OTS Realizeestablishment managementandmaintenanceforend to endopticalpathOpticallayerheaderprocessingOpticalchannelmonitoringAdaptiontoelectricallayer multi serviceaccess Realizethenetworkingfunctionofmulti wavelengthopticalsignalsRealizetheprocessingofOMS headerThemanagementandmaintenanceofOMS ProvidethefunctionofopticalsignalstransportindifferenttypesofopticalmediumThemanagementandmaintenanceofOTS Page18 OTNhierarchicalstructureandrelationshipamonginformationflow Page19 Page20 Chapter3G 709Introduction Section1 FrameStructure OPUOverhead Contents Page21 G 709introduction Page22 3825 4080 1 7 8 14 15 16 17 3824 1 2 3 4 OPUkPayload K rate levelK12 5G210G340G FrameStructure Page23 ComparedwithSDH Structure 4 4080 invariableRate Variable20 420kHz 48 971 s forOTU182 027kHz 12 191 s forOTU2329 489kHz 3 035 s forOTU3Contain OPUk ODUk OTUk FEC G 709FrameStructure SDHFrameStructure Structure 9 270n VariableRate 8000F s invariableContain SectionOverhead pointerChannelOverhead Payload Page24 PSIEachOPUkoverheadprovidesonebyteofPSI OnecompletePSIinformationstructurecomposedwith256PSIinacomplexframe PSI 0 is1byteofpayloadtype PT PSI 1 PSI 255 arereserved OPUkOverhead k 1 2 3 Page25 OPUkOverhead k 1 2 3 PTOverheadinstructions Page26 JC OPUkOverhead k 1 2 3 3bytesThefirstsixbitsofEachbytearereserved ThelasttwobitsindicatePositiveandnegativeadjustmentbetweenClientdataandOPUk Page27 Contents Chapter3G 709Introduction Section2 OTUk ODUkOverhead OTUk ODUkOverhead Page28 Page29 OTUk ODUkOverhead k 1 2 3 1 8 14 7 1 2 3 4 6 Page30 OTUk ODUkOverhead k 1 2 3 MultiframeAlignmentSignal MFAS 1Byte 256framescomprisedamultiframe 256Bytes FrameAlignmentSignal FAS 6Bytes OA1 F6h OA2 28hindicatethebeginningofaframe AccessPointIdentifier SAPI DAPI typecodedefinedbySuggestionT 50 OTUk ODUkOverhead k 1 2 3 Page32 OTUkOverhead k 1 2 3 OTUkSMoverheadBIP 8byte 1Byte OTUkSMoverhead 3Bytes Page33 OTUkOverhead k 1 2 3 OTUkSMoverhead BackwardErrorIndicationandBackwardIncomingAlignmentError BEI BIAE UsedtoreturnthenumberofErrorandIAEreceivedbyOTUk 1011 equalstoBIAE Page34 OTUkOverhead k 1 2 3 OTUkSMoverhead BackwardDefectIndication BDI UsedtoreturnsignaldefectstatusreceivedbyOTUk 1 equalstoDefectstatus else 0 OTUkSMoverhead IncomingAlignmentError IAE UsedtoindicateAlignmenterrorstatusreceivedbyOTUk 1 equalstoAlignmenterror else 0 GCC GeneralCommunicationChannelJustlikeDC1 DC12inSDH usedtocommunicatebetweenOTUkterminal Page35 ODUkOverhead k 1 2 3 ODUkPMoverhead OTUkSMoverhead Page36 ODUkOverhead k 1 2 3 ODUkPMOverhead PathStatusindication STAT UsedtoindicatePathstatus Page37 ODUkOverhead k 1 2 3 ODUkFaulttypeandFaultlocationreportingchannel FTFL 0 127Byteforwardindicationfield 128 255Bytebackwardindicationfield ForwardandBackwardindicationfieldinclude3sub fieldsyet Page38 ODUkOverhead k 1 2 3 FaultIndicationCode Forward BackwardoperatoridentifierField 9bytes IndicateForward BackwardoperatorandCountrycode othersusedbyoperatorseparately nostandardization GCC1GCC2 thefunctionissameasGCC0APS PCC EXP TCMACK nostandardization reservedforfuture ODUkOverhead k 1 2 3 OTNOverheadcomparewithSDH Page40 Contents Chapter3G 709Introduction Section3 Mapping Multiplexing MappingClientSignals IP ETHERNETATM Multiplexing WavelengthDivisionMultiplex WDM TimeDivisionMultiplex TDM Page41 MappingIPandEthernet G 709providesanencapsulationforpacketbasedclientsignalsThereisnoneedforSDHor10G EthernettoencapsulateIPAnewprotocolisbeingdefined GenericFramingProcedure BandwidthforGFPstreaminODU1 2488320kbit sODU2 9995276kbit sODU3 40150519kbit s Page42 GenericFramingProcedureG 7041 Page43 MappingATM G 709providesamappingforcellbasedclientsignalsMappingATMintoODUkissimilartomappingintoSDH BandwidthforATMstreaminODU1 2488320kbit sODU2 9995276kbit sODU3 40150519kbit s Page44 TimeDivisionMultiplex Structure Page45 WavelengthDivisionMultiplex Structure Page46 Page47 Contents Chapter4OTNkeyTechnologies Section1 OTHIntroduction OTHequipments wavelengthleveltrafficcrosscompletethewavelengthcrossandscheduling TrafficparticlesODUk k 1 2 3 RateoftrafficparticlesODU1 2 5Gb s ODU2 10Gb s ODU3 40Gb s KeyTechnologies OTHOTH OpticalTransmissionHierarchy Page48 ODU1 ODU2 ODU3cross StrongsupportforOTNoverhead Flexiblenetworking ProtectionandRestoration SupportIntelligentcontrolplane Shortcomings Smallparticletrafficisnotsuitableforscheduling Technologiesneedfurtherimprovement suchasringprotectiontechnology ProtectionandRestorationtechnology Page49 KeyTechnologies OTH Realization OTUdividedintotheClientsideandGroupofroadsideFeatures Largetrafficparticles 1 100Gb sLargecrossparticlesThereisnouniformcrossparticleslikeVC4ProtectiontheSchedulingOnlyneedtochangeinterfaceplatewhentrafficchanges ImplementationofOTHCross Page50 OTHsystem SDHequipmentremoved increasingtheODUkcrossmatrix ODUkcrossmatrixachievedbycrossplate Equipmentcomparison OTHandSDH WDM Page51 SDH WDMsystem OTHsystem Page52 Contents Chapter4OTNkeyTechnologies Section2 ROADMTechnology Page53 TheEvolutionofOpticalNetworks WDMPointtopointtransmission Multi pointnetwork ROADM WXCandASONrealizeopticallayerinterconnection Page54 OTNopticallayernetwork ROADM Themainadvantage 1 achievethepureopticaldomainnetwork 2 withoutOEOconversion reducenetworkcosts 3 forlargeparticlesbusinesses suchas10Gb s 40Gb s Shortcoming 1 transmissiondistancelimitation CD PMD nonlinear OSNR 2 thehigherinitialinvestment IP MPLS SDH IP MPLS SDH IP MPLS SDH Wavelengthcross level purelightprocessing introductionofintelligentcontrolplane CD PMD nonlinear OSNR Page55 Opticallayerscheduling ThedistributionofWavelengthresourcesinWDMequipment FOADM FixedOpticalAdd DropMultiplexer ROADM ReconfigurableOpticalAdd DropMultiplexer FOADM re adjustthedistributionofwavelengthresourcesisdiffitcult ROADM Byblockingorcross wavelength Wavelengthresourcescanbeallocatedflexibly dynamically ROADMtechnologyremotlyanddynamicallyadjustthestateofwavelength thenumberofwavelengthsupto40waves Page56 FOADM ROADM FOADM ROADM 1 n 1 4 OA OA 1 n OAD 1 n 1 n OA OA 1 n ROADM OA 1 n fixedwavelengthup down theinitialplanningcomplex upgradedifficulties Complexupgradeproject operationandmaintenancecostshigh Manualconfiguration increasehumanerrorpossible multi direction Up downwavelengthflexibilityReconfiguredthrougharemotenetworkmanagementsystemLowoperationandmaintenancecostsTrafficforlargeparticles Page57 FOADM OMTfunctionalunit OTU LMS2E OTU2S OTU2E OMU ODU OMU48 O ODU48 O OBA OLA OPA OA PA RAU OSC ADU OSCAD EMU EMU Page58 ROADM Opticallayerservicesautomaticschedulingby100GHzor50GHzthatcanachieveopticalcross Trafficschedulingwithelectricallayerandprotection Thecostofstaionishigh Trafficforlargeparticles Page59 Withexistingtechnology ROADMcanbeeasilyachievedfourlightdirectionscrossforeachdirectionof40or80waves crosscapacityof1 6Tor3 2T Itisexpectedtosupport8directionsquickly ROADM Page60 Contents Chapter4OTNkeyTechnologies Section3 RealizationofROADM Currently therearethreecommontechniquesinROADMsubsystem PLC PlanarLight waveCircuits WB WavelengthBlocker WSS WavelengthSelectiveSwitch RealizationofROADM Page61 TheworkingprincipleofWB Wavelengthontheroadchosenwillcombinewiththeotheropticalsignalsoforiginaltransmitionsignalsthroughacouplertocontinuesendsignalsdowntransmissioncombination Page62 TechnologyofWB 2Ddevice Controlthepowerofeachwavelength Blocking bywavelength BalancedSpectrum LCD MEMSwavelengthblockercansupportmorechannelsoflight andsmallerintervals 50G 100GHz 128 64lightchannels itcanreducedto25GHzinterval under10Gand40G LiquidcrystalwavelengthblockersneedadditionalA DModule Page63 TheWorkingPrincipleofPLC ROADM ThesolutionsbasedonROADMofiPLCdon tneedWB sblocking AfterdemultiplexingofWDM itusestheN 2 1opticalswitch sothatthefuctiononthewayandmultiplexingcombined Page64 TechnologyofPLC ItrealizesthemultiplexinganddemultiplexingofthewavelengthsbytheintegratedAWG opticalswitchrealizeswavelengths directjoiningandblocking theVOArealizesopticalpowerbalanceofper channel Support100GHz 40 Gbit s 10Gbps16nodescascadegoesthroughthevalidation 40Gbpsneedstotest low costsolution Page65 TechnologyofWSS TheopticalplatformbasedonMEMScansupport1 9100GHzor5 150GHzdevice MEMSdeviceshaveawidefrequency lowdispersionandsimultaneouslysupport10 40Gbit sopticalsignal Thewavelengthdefinitionbasedonport Colorless Itcansupporthigherdimensions uptoDegree8 butitneedsmoreintegratedcomponents andcontrolscomplexly Withthedevelopmentofmanufacturingprocesses costsofWSScontinuetodecline graduallybecomingthemainstreamtechnologyROADMdevices WSS WavelengthSelectiveSwitch Page66 TheWorkingPrincipleofWSS Page67 Page68 Contents OTNControlPlane OTNcontrolplane ManagementTransmissionPlane OTNTransmissionplane Page69 OTNEvolution PhaseIandcurrentG 709Hierarchy I e ODUk ODUke becomeaserviceforthenewODUkhserverlayer Page70