OTN原理及关键技术.ppt

Principle and Key Technologies of OTN1精选课件Page 2Chapter 1 Background and Concept of OTNContentsContentsChapter 2 Hierarchy of OTNChapter 3 G.709 IntroductionChapter 4 OTN key TechnologiesChapter 5 Review and Outlook 2精选课件Page 3Chapter 1 Background&Concept of OTNSection 1:Background of OTNContentsContents3精选课件In the next 3 to 5 years,new business development will drive rapid growth in business volume.Rapid growth of new business based broadband services of large particles.A large number broadband services of large particles require effective scheduling and management,improving the QoS,to meet the needs of network operators.Internet Access residential31%BB AccInternet 11%Private lines 25%Video Distribution27%Voice(Fixed+Mobile)4%Network Development under IP-driven trendBroadband business is booming which proposed new requirements on the transmission network!Data Services(ATM/FR,VPN)2%Page 44精选课件PDHSDH?The Road of Transport Network Technology EvolutionPage 55精选课件Analysis of the different Transmission TechnologyPDHSDHWDMPDH:Quasi-synchronous digital hierarchy，it have better adaptability for point to point communication.However,PDH network lack of management capacity.SDH：synchronous digital hierarchy.It has many advantages,such as standard optical interface,a powerful network management capabilities.However,it can not provide us large-capacity and high-speed.WDM：Large bandwidth,low transmission costs,adapting to high-speed large-capacity transmission.But the network is not flexible and can not achieve effective management.6精选课件WDMWDMSDH/ASONSDH/ASONOur Current RequirementsLarge bandwidth and large particlesHigh network survivability and reliability High network efficiency，provide business quickly Low-cost network must easy to expandEasy for Equipment manufacturers to connectPage 77精选课件Demand drives technology development So how can we have the So how can we have the advantages of SDH and WDM advantages of SDH and WDM in the same timein the same time?ThenOTN came into beingThenOTN came into beingPage 88精选课件Chapter 1 Background&Concept of OTNSection 2:Concept of OTNPage 9ContentsContents9精选课件Concept of OTN OTN concept proposed：In 1998,ITU-T formally proposed the concept,and took it as an ideal basis for future network evolution.OTN：Optical Transport NetworkOptical Transport Network(OTN)is composed of a set of Optical Network Elements connected by optical fiber links,able to provide functionality of transport,multiplexing,routing,management,supervision and survivability of client signals,according to the requirements given in Rec.G.872.An Optical Transport Network is an transport network based on WDM technology .It is the next-generation backbone network.Page 1010精选课件Framework of OTNIn February 1999,G.872,the first proposal of OTN was approved.Nowadays,OTN standard system has been improved.Management information model G.874.1/875Architecture aspectsG.872Physical layer characteristicsG.959.1/692/693Equipment management Aspects G.874/7710Jitter/drift performance G.8251Optical safety regulationsG.664BERG.8201Equipment functionG.806/G.798Structure/Mapping/Overhead G.709APSG.873.1/808.1Page 1111精选课件OTN CharacteristicOTN Hierarchy defined in G.872Complex framing defined in G.709Interface defined in G.709，Including wavelength division side and client side(typically used for interconnection)Reconfigurable optical add-drop multiplexerODUk cross（OTH)Load control planePage 1212精选课件OTN characteristicNetwork Hierarchy of OTNOPUODUOTUElectrical layerOChOMSOTSOptical layerROADMOTNOptical layer and electrical layer performance monitoringOptical layer performance monitoringOTU（OTN frame structure）OTN includes electrical-layer network and optical-layer networkPage 1313精选课件OTN Technical Superiority1.Full-service access and large capacity transmission2.Maintenance&Management3.Networking and Protection 4.Flexible groomingSDH、Ethernet、IP、ATM、GFP transparent transmissionTbits level transport capabilityWealth of overhead bytesSix levels of independent Tandem Connection Monitoring(TCM)Supporting traditional WDM optical layer protectionIntelligent protection and restoration with Mesh networks Optical layer cross-connectMultiplexer and grooming sub-wavelength services(ODUk/GE)ODUk cascade and virtual cascadePage 14OTNSuperiority14精选课件Chapter 2 Hierarchy of OTNPage 15ContentsContents15精选课件OTN Hierarchical StructureThe optical layer can be divided into：Optical Channel(OCh)、Optical Multiplex Section、Optical Transmission Section(OMS)OCh can be divided into three sub-layer electronic field：Optical Payload Unit（OPU）、Optical Data Unit（ODU）、Optical Transport Unit（OTU）Optical layerOptical Channel layer network（OCh）Optical Multiplex Sectionlayer network（OMS）Optical Transmission Sectionlayer network（OTS）Client layerOCh Payload Unit（OPU）OCh Data Unit（ODU）OCh transport Unit（OTU）OChOptical layerThree electronic field layersIP、ETHERNET、ATM、SDH/SONETPage 1616精选课件OTN Hierarchical StructureEssentially，OTN consists of following parts：Optical Transmission Section(OTS)Optical Channel(OCh)Optical Multiplex Section(OMS)Optical Data Unit(ODU)Optical Transport Unit(OTU)Optical Payload Unit(OPU)Page 1717精选课件Function of OTN each layerOTNOChOMSOTSRealize establishment,management and maintenance for end-to-end optical pathOptical layer header processingOptical channel monitoringAdaption to electrical layer、multi-service accessRealize the networking function of multi-wavelength optical signalsRealize the processing of OMS headerThe management and maintenance of OMSProvide the function of optical signals transport in different types of optical mediumThe management and maintenance of OTSPage 1818精选课件ClientWrapperODUkFECOHOPUkOHAssociated overheadClientOHElectrical layerClientODUkFECOHOPUkOHClientOHOCh PayloadE/OE/OOPS0OPSnOMSnOTSnOTM-nr.mOTM-0.mOTM-n.mNon-associated overheadOOSOSCOHOHOHOCh PayloadOCCOCCOCCOptical layer Client signalsClient signalsOTUkOTUkOTN hierarchical structure and relationship among information flowPage 1919精选课件Page 20Chapter 3 G.709 IntroductionSection 1:Frame Structure&OPU OverheadContentsContents20精选课件Page 21G.709 introduction 21精选课件Page 22382540801781415161738241234OPU k PayloadOTUkFECOTUk OHOTUk OTUk Optical Channel Transport Unit-k Optical Channel Transport Unit-kAlignmFrame Frame alignmentalignment K:rate-level K 1 2.5G2 10G3 40GFrame StructureFrame StructureODUODUk k Optical Channel Data Unit-kOptical Channel Data Unit-k ODUk OHOPUk OPUk Optical Channel Payload Unit-k Optical Channel Payload Unit-k OPUk OHClient SignalClient SignalClient Signalmapped inOPUk Payload22精选课件Page 23Compared with SDHStructure：44080，invariableRate：Variable 20.420 kHz(48.971 s)for OTU182.027 kHz(12.191 s)for OTU2329.489 kHz(3.035 s)for OTU3Contain：OPUk、ODUk、OTUk、FECG.709 Frame StructureSDH Frame Structure Structure：9270n，Variable Rate：8000F/s，invariableContain：Section Overhead、pointer Channel Overhead、Payload 23精选课件Page 24uPSIEach OPUk overhead provides one byte of PSI;One complete PSI information structure composed with 256 PSI in a complex frame;PSI 0 is 1 byte of payload type（PT）,PSI 1-PSI 255 are reserved.OPUk Overhead(k=1,2,3)24精选课件Page 25OPUk Overhead(k=1,2,3)MSB1234LSB5678Hex code(Note 1)Interpretation0 0 0 00 0 0 00 0 0 10 0 0 10101Experimental mappingExperimental mapping0 0 0 00 0 0 00 0 1 00 0 1 00202Asynchronous CBR mapping,Asynchronous CBR mapping,0 0 0 00 0 0 00 0 1 10 0 1 10303Bit synchronous CBR mappingBit synchronous CBR mapping0 0 0 00 0 0 00 1 0 00 1 0 00404ATM mappingATM mapping0 0 0 00 0 0 00 1 0 10 1 0 10505GFP mappingGFP mapping0 0 0 00 0 0 00 1 1 00 1 1 00606Virtual Concatenated signalVirtual Concatenated signal0 0 0 10 0 0 10 0 0 00 0 0 01010Bit stream with octet timing mappingBit stream with octet timing mapping0 0 0 10 0 0 10 0 0 10 0 0 11111Bit stream without octet timing mappingBit stream without octet timing mapping0 0 1 00 0 1 00 1 1 00 1 1 02020ODU multiplex structureODU multiplex structure0 1 0 10 1 0 10 1 0 10 1 0 15555Not availableNot available0 1 1 00 1 1 00 1 1 00 1 1 06666Not availableNot available1 0 0 01 0 0 0 x x x xx x x x80-8F80-8FReserved codes for proprietary useReserved codes for proprietary use1 1 1 11 1 1 11 1 0 11 1 0 1FDFDNULL test signal mappingNULL test signal mapping1 1 1 11 1 1 11 1 1 01 1 1 0FEFEPRBS test signal mappingPRBS test signal mapping1 1 1 11 1 1 11 1 1 11 1 1 1FFFFNot availableNot availablePT PT PT PT Overhead instructions Overhead instructions Overhead instructions Overhead instructions：25精选课件Page 26uJCOPUk Overhead(k=1,2,3)3 bytes The first six bits of Each byte are reserved;The last two bits indicate Positive and negative adjustment between Client data and OPUk.26精选课件Page 27ContentsContentsChapter 3 G.709 IntroductionSection 2:OTUk&ODUk Overhead27精选课件OTUk/ODUk OverheadPage 2828精选课件Page 29OTUk/ODUk Overhead(k=1,2,3)EXPTCMACTTCM5TCM4TCM3TCM2TCM1TCM6GCC1GCC2FTFLPMRESRESAPS/PCCSMRESGCC0FASMFASTCMiSTATTTIBIP-81234567812312345678BEI/BIAEBDI12345678181471234TTIBIP-812345678123PM12345678BEIBDISTAT12345678MFAS:Multi-Frame Alignment SignalPCC:Protection Communication Control channelPM:Path MonitoringPSI:Payload Structure IdentifierRES:Reserved for future international standardisationSM:Section MonitoringTCM:Tandem Connection MonitoringACT:Activation/deactivation control channelAPS:Automatic Protection Switching coordination channelEXP:ExperimentalFAS:Frame Alignment SignalFTFL:Fault Type&Fault Location reporting channelGCC:General Communication Channel629精选课件Page 30OTUk/ODUk Overhead(k=1,2,3)Multiframe Alignment Signal MFAS（1 Byte）,256 frames comprised a multiframe(256Bytes)lFrame Alignment Signal FAS（6 Bytes)OA1F6h，OA228h indicate the beginning of a frame30精选课件Access Point Identifier（SAPI，DAPI）type code defined by Suggestion T.50OTUk/ODUk Overhead(k=1,2,3)31精选课件Page 32OTUk Overhead(k=1,2,3)OTUk SM overhead BIP-8 byte(1 Byte)lOTUk SM overhead（3 Bytes)32精选课件Page 33OTUk Overhead(k=1,2,3)OTUk SM overhead:Backward Error Indication and Backward Incoming Alignment Error(BEI/BIAE)Used to return the number of Error and IAE received by OTUk,“1011”equals to BIAEOTUk SM BEI/BIAE bits1234BIAEBIP violations00000000falsefalse0 000010001falsefalse1 100100010falsefalse2 200110011falsefalse3 301000100falsefalse4 401010101falsefalse5 501100110falsefalse6 601110111falsefalse7 710001000falsefalse8 81001,10101001,1010falsefalse0 010111011truetrue0 01100 to 11111100 to 1111falsefalse0 033精选课件Page 34OTUk Overhead(k=1,2,3)OTUk SM overhead:Backward Defect Indication(BDI)Used to return signal defect status received by OTUk;“1”equals to Defect status，else“0”OTUk SM overhead:Incoming Alignment Error（IAE）Used to indicate Alignment error status received by OTUk；“1”equals to Alignment error，else“0”GCC:General Communication Channel Just like DC1DC12 in SDH,used to communicate between OTUk terminal.34精选课件Page 35ODUk Overhead(k=1,2,3)lODUk PM overheadlOTUk SM overhead35精选课件Page 36ODUk Overhead(k=1,2,3)ODUk PM Overhead:Path Status indication (STAT)Used to indicate Path statusPM byte 3,bits678Status000000Reserved for future international standardizationReserved for future international standardization001001Normal path signalNormal path signal010010Reserved for future international standardizationReserved for future international standardization011011Reserved for future international standardizationReserved for future international standardization100100Reserved for future international standardizationReserved for future international standardization101101Maintenance signal:ODUk-LCKMaintenance signal:ODUk-LCK110110Maintenance signal:ODUk-OCIMaintenance signal:ODUk-OCI111111Maintenance signal:ODUk-AISMaintenance signal:ODUk-AIS36精选课件Page 37ODUk Overhead(k=1,2,3)ODUk Fault type and Fault location reporting channel（FTFL)0127Byte forward indication field，128255Byte backward indication fieldForward and Backward indication field include 3 sub-fields yet37精选课件Page 38ODUk Overhead(k=1,2,3)Fault Indication CodeForward/Backward operator identifier Field(9 bytes)Indicate Forward/Backward operator and Country code.others used by operator separately,no standardization.Fault indication codeDefinition0000 00000000 0000No FaultNo Fault0000 00010000 0001Signal FailSignal Fail0000 00100000 0010Signal DegradeSignal Degrade0000 00110000 0011.1111 11111111 1111Reserved for future international Reserved for future international StandardizationStandardization38精选课件GCC1 GCC2:the function is same as GCC0APS/PCC&EXP&TCM ACK,no standardization,reserved for future.ODUk Overhead(k=1,2,3)OTNMeaningSDHOTNMeaningSDHFASFrame Alignment A1/A2FTFLFault type&Fault Location reportMFASMultiframe AlignmentH4GCC12General Communication ChannelD1D12SMSection MonitoringAPS/PCCAutomatic Protection SwitchK1/K2/K3TTITrial Trace IdentifierJ0PSIPayload Structure IdentifierBIP-8BIP-8 Check bytesB1/B2PTPayload TypesBEIBackward Error IndicationREIJCAdjustment ControlC1/C2BDIBackward Defect IndicationRDINJONegative Adjustment S1/S2TCM16Tandem Connection MonitoringN1/N2PJOPositive AdjustmentS1/S2STATPMPath MonitoringOTN Overhead compare with SDH39精选课件Page 40ContentsContentsChapter 3 G.709 IntroductionSection 3:Mapping&Multiplexing40精选课件Mapping Client SignalsIP,ETHERNETATMMultiplexingMultiplexingWavelength Division Multiplex(WDM)Time Division Multiplex(TDM)Page 4141精选课件Mapping IP and EthernetG.709 provides an encapsulation for packet based client signals There is no need for SDH or 10G-Ethernet to encapsulate IPA new protocol is being defined:Generic Framing ProcedureBandwidth for GFP stream inODU1:2 488 320 kbit/sODU2:9 995 276 kbit/sODU3:40 150 519 kbit/sPage 4242精选课件Generic Framing Procedure G.7041Page 4343精选课件Mapping ATMG.709 provides a mapping for cell based client signals Mapping ATM into ODUk is similar to mapping into SDHBandwidth for ATM stream inODU1:2 488 320 kbit/sODU2:9 995 276 kbit/sODU3:40 150 519 kbit/sPage 4444精选课件Time Division Multiplex-StructurePage 4545精选课件Wavelength Division Multiplex-StructurePage 4646精选课件Page 47ContentsContentsChapter 4 OTN key TechnologiesSection 1:OTH Introduction47精选课件 OTH equipments:wavelength level traffic crossOTH equipments:wavelength level traffic cross completecomplete the wavelength cross and scheduling the wavelength cross and scheduling.Traffic particlesTraffic particles ODUkODUk（k=1,2,3k=1,2,3）Rate of traffic particlesRate of traffic particles ODU1ODU1（2.5Gb/s2.5Gb/s）、）、ODU2ODU2（10Gb/s10Gb/s）、ODU3ODU3（40Gb/s40Gb/s）Key Technologies-OTH OTH:Optical Transmission HierarchyPage 4848精选课件ODU1/ODU2/ODU3 crossStrong support for OTN overhead Flexible networking,Protection and RestorationSupport Intelligent control planeShortcomings:-Small particle traffic is not suitable for scheduling.-Technologies need further improvement,such as ring protection technology,Protection and Restoration technology.Page 49 Key Technologies-OTH49精选课件Realization：OTU divided into the Client side and Group of road side Features:Large traffic particles：1-100Gb/sLarge cross particlesThere is no uniform cross particles like VC4Protection the Scheduling Only need to change interface plate when