OTN学习笔记整理

OTN学习笔记1、Theopticaltransporthierarchy(OTH)supportstheoperationandmanagementaspectsofopticalnetworksofvariousarchitectures,e.g.,point-to-point,ringandmesharchitectures.ThisRecommendationdefinestheinterfacesoftheopticaltransportnetworktobeusedwithinandbetweensubnetworksoftheopticalnetwork,intermsof:–opticaltransporthierarchy(OTH);–functionalityoftheoverheadinsupportofmulti-wavelengthopticalnetworks;–

framestructures;–

bitrates;–formatsformappingclientsignals.光传送序列（OTH）支持各种体系结构（即点对点、环形和网孔形体系结构）光网络的运行和管理。依据光传送序列（OTH）、多波长光网络支持中的开销功能、帧结构比特率及映射客户信号的方式，本建议定义了光传送网络的接口，以便将这些接口用于光网络的子网内部和子网之间。2、opticaltransportmodule(OTM-n.m):TheOTMistheinformationstructurethatistransportedacrossanONNI.Theindexnandmdefinethenumberofsupportedwavelengthsandbitratesattheinterface.TwoOTMstructuresaredefined:TheOTMwithfullfunctionality(OTM-n.m)istheinformationstructureusedtosupportopticaltransmissionsection(OTS)layerconnectionsintheOTN.Thecharacteristicinformationoftheopticaltransmissionsectionlayer(OTS_CI)consistsofinformationpayload(OTS_CI_PLD)andopticaltransmissionsectionoverheadinformationfields(OTS_CI_OH).Theopticaltransmissionsectionoverhead(OTS_OH)informationfieldsarecontainedwithintheOTMoverheadsignal(OOS)informationstructure.TheOTM-n.mconsistsofuptonmultiplexedopticalchannelsandanOTMoverheadsignaltosupportthenon-associatedoverhead.TheOTMwithreducedfunctionality(OTM-nr.m/OTM-0)istheinformationstructureusedtosupportopticalphysicalsection(OPS)layerconnectionsintheOTN.Thecharacteristicinformationoftheopticalphysicalsectionlayer(OPS_CI)consistsofinformationpayload(OPS_CI_PLD).OTM-0consistsofasingleopticalchannelwithoutaspecificcolourassigned.TheOTM-nr.mconsistsofuptonmultiplexedopticalchannels.Non-associatedoverheadisnotsupported光传送模块（OTM）：OTM是穿越ONNI传送的信息结构。n和m定义了接口支持的波长数量和比特率。定义了两种OTM：完全功能OTM（OTM-n.m）和简化功能OTM（OTM-0和OTM-nr.m）。完全功能OTM（OTM-n.m）是用于支持OTN中光传输段（OTS）层连接的信息结构。光传输段层的特征信息（OTS_CI）由信息净荷（OTS_CI_PLD）和光传输段开销信息（OTS_CI_OH）组成。光传输段开销（OTS_OH）信息包含在OTM开销信号（OOS）信息结构中。为了支持非联合开销，完全功能OTM-n.m由最多n个复用的光信道和一个OTM开销构成。简化功能OTM（OTM-nr.m/OTM-0）是用于支持OTN中光物理段（OPS）层连接的信息结构。光物理段层的特征信息（OPS_CI）由信息净荷（OPS_CI_PLD）组成。OTM-0由不具有分配特定颜色的单个光信道构成。OTM-nr.m最多由n个复用光信道组成。不支持非联合开销。3、opticalchannel(OCh[r]):TheOChistheinformationstructureusedtosupporttheOChtrail.TwoOChstructuresaredefined.TheOChclientsignalsdefinedinthisRecommendationaretheOTUksignals.Otherdigitalclientsignals(e.g.,STM-n,GbE)maybesupportedbytheOTM.Opticalchannelwithfullfunctionality(OCh):TheOChisaninformationstructureconsistingoftheinformationpayload(OCh_PLD)withacertainbandwidthandnon-associatedoverhead(OCh_OH)formanagementoftheopticalchannel.Opticalchannelwithreducedfunctionality(OChr):TheOChrisaninformationstructureconsistingoftheinformationpayload(OCh_PLD)withacertainbandwidth.Non-associatedoverheadisnotsupported.光信道（OCh）：OCh是用于支持OCh踪迹的信号结构。定义了两种结构的OCh。本建议中定义的OCh客户信号为OTUk信号。可以通过OTM支持其他数字客户信号（即STM-n和GbE）。完全功能光信道（OCh）：为了管理光信道，OCh是一种由具有特定带宽和非联合开销（OCh_OH）的、信息净荷（OCh_PLD）组成的信息结构。简化功能光信道（OChr）：OChr是一种由具有特定带宽的、信息净荷组成的信息结构。不支持非联合开销。4、opticalchanneltransportunit(OTUk[V]):TheOTUkistheinformationstructureusedfortransportofanODUkoveroneormoreopticalchannelconnections.ItconsistsoftheopticalchanneldataunitandOTUkrelatedoverhead(FECandoverheadformanagementofanopticalchannelconnection).Itischaracterizedbyitsframestructure,bitrate,andbandwidth.TwoversionsoftheOTUkaredefined:CompletelystandardizedOTUk(OTUk):ThecompletelystandardizedOTUkisusedonOTMIrDIsandmaybeusedonOTMIaDIs.FunctionallystandardizedOTUk(OTUkV):ThepartlystandardizedOTUkisusedonOTMIaDIs.光信道传送单元（OTUk）：OTUk是为了在一个或多个光信道连接上进行光信道数据单元（ODUk）传送的信息结构。它由ODUk和OTUk相关开销（用于光信道连接的FEC和开销）组成。它由其帧结构、比特率及带宽规范。定义了两种版本的OTUk。完全标准化OTUk（OTUk）：完全标准化OTUk可以用于OTMIrDIs和OTMIaDIs。功能标准化OTUk（OTUkV）：部分标准化OTUk用于OTMIaDIs。5、opticalchannelpayloadunit(OPUk):TheOPUkistheinformationstructureusedtoadaptclientinformationfortransportoveranopticalchannel.ItcomprisesclientinformationtogetherwithanyoverheadneededtoperformrateadaptationbetweentheclientsignalrateandtheOPUkpayloadrateandotherOPUkoverheadsupportingtheclientsignaltransport.Thisoverheadisadaptationspecific.光信道净荷单元（OPUk）：OPUk是为了用于在一个光信道中传送适配客户信息的信息结构。它由客户信息与需要在客户信号比特率与OPUk比特率之间完成速率适配的任何开销和支持客户信号传送的其他OPUk开销一起组成。该开销是适配特定的。6、opticalmultiplexunit(OMU-n,n

≥

1):TheOMU-nistheinformationstructureusedtosupportopticalmultiplexsection(OMS)layerconnectionsintheOTN.Thecharacteristicinformationoftheopticalmultiplexsectionlayer(OMS_CI)consistsofinformationpayload(OMS_CI_PLD)andopticalmultiplexsectionoverheadinformationfields(OMS_CI_OH).TheOMS_CI_PLDconsistsoftheOCG-npayload.TheOMS_CI_OHconsistsoftheOCG-noverheadandOMSspecificoverheadandistransportedwithintheOOSinformationstructure.TheorderoftheOMUisdefinedbytheorderoftheOCGthatitsupports光复用单元（OMU-n,n

≥

1）：OMU-n是用于在OTN中支持光复用段（OMS）层连接的信息结构。光复用段层的特定信息（OMS_CI）由信息净荷（OMS_CI_PLD）和光复用段开销信息（OMS_CI_OH）组成。OMS_CI_PLD由OCG-n净荷组成。OMS_CI_OH由OCG-n开销和OMS特定开销组成，并且在一个OOS信息结构中传送。OMU的阶数支持的OCG阶数决定。7、opticaltransportnetworknodeinterface(ONNI):Theinterfaceatanopticaltransportnetworknodewhichisusedtointerconnectwithanotheropticaltransportnetworknode.光传送网络节点接口（ONNI）：用于与其他光传送网络节点连接的、在光传送网络节点处的接口。8、OTMoverheadsignal(OOS):TheOOSistheinformationstructureusedfortransportofOTMnon-associatedoverheadovertheopticalsupervisorychannel.Thenon-associatedoverheadconsistsoftheopticaltransmissionsectionoverhead,opticalmultiplexsectionoverheadandopticalchannelnon-associatedoverhead.Itischaracterizedbyitsframestructure,bitrateandbandwidth.OTM开销信号（OOS）：OOS是用于在光监控信道上进行OTM非联合开销传送的信息结构。非联合开销由光传输段开销、光复用段开销和光信道非联合开销组成。它由其帧结构、比特率及带宽规范。9、opticalsupervisorychannel(OSC):ThephysicalcarrieroutsideoftheamplifierbandthatprovidestransportoftheOTMoverheadsignal.光信道监控信道（OSC）：提供OTM开销信号传送的放大器带外物理载波。10、OTUk,ODUkandOPUkoverheadassignment:Theassignmentofoverheadintheopticalchanneltransport/data/payloadunitsignaltoeachpartisdefinedinFigure5-1.OTUk、ODUk和OPUk开销分配：光信道传送/数据/净荷单元信号到每一部分中的开销分配如下。图5.111、OpticaltransportnetworkinterfacestructureTheopticaltransportnetworkasspecifiedinITU-TRec.G.872definestwointerfaceclasses:-

Inter-domaininterface(IrDI);-

Intra-domaininterface(IaDI).ThebasicsignalstructureisshowninFigure6-1.光传送网络接口结构ITU-TG.872建议中规范的光传送网络定义了两种接口类型：域间接口（IrDI）和域内接口（IaDI）。图6.112、opticaltransport