OTN原理及关键技术PPT文档格式.ppt

1、Principle and Key Technologies of OTNPage 2Chapter 1 Background and Concept of OTNContentsContentsChapter 2 Hierarchy of OTNChapter 3 G.709 IntroductionChapter 4 OTN key TechnologiesChapter 5 Review and Outlook Page 3Chapter 1 Background&#Concept of OTNSection 1:#Background of OTNContentsContentsIn

2、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 n

3、etwork 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 4PDHSDH?#The

4、 Road of Transport Network Technology EvolutionPage 5Analysis 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 h

5、as 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 achi

6、eve effective management.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 7Demand drives tec

7、hnology 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?#ThenThenOTN came into beingOTN came into beingPage 8Chapter 1 Background&#Concept of OTNSection 2:#Concept of OTNPage 9ContentsContentsConcept of OT

8、N 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 o

9、f 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 10Framework of OTNIn February 199

10、9,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 regulations

11、G.664BERG.8201Equipment functionG.806/G.798Structure/Mapping/Overhead G.709APSG.873.1/808.1Page 11OTN 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）Reconfigu

12、rable optical add-drop multiplexerODUk cross（OTH）Load control planePage 12OTN characteristicNetwork Hierarchy of OTNOPUODUOTUElectrical layerOChOMSOTSOptical layerROADMOTNOptical layer and electrical layer performance monitoringOptical layer performance monitoringOTU（OTN frame structure）OTN includes

13、 electrical-layer network and optical-layer networkPage 13OTN 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 ov

14、erhead 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

15、 14OTNSuperiorityChapter 2 Hierarchy of OTNPage 15ContentsContentsOTN 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）、Optic

16、al 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 16OTN Hierarchical StructureEssentially，OTN consists of following parts：#Optical Transmission Section（OTS）Optical Channel（OCh）Optical Multiplex Section（OMS）Optical Data Unit（ODU）Optical