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1、IEEE802.3ah協(xié)議學(xué)習(xí)(3)MPCP多點(diǎn)控制協(xié)議64.3Multi-PointControlProtocol(MPCP)AsdepictedinFigure64-3,theMulti-pointMACControlfunctionalblockcomprisesthefollowingfunctions:a)DiscoveryProcessing.Thisblockmanagesthediscoveryprocess,throughwhichanONUisdiscoveredandregister
2、edwiththenetworkwhilecompensatingforRTT.b)ReportProcessing.Thisblockmanagesthegenerationandcollectionofreportmessages,throughwhichbandwidthrequirementsaresentupstreamfromtheONUtotheOLT.c)GateProcessing.Thisblockmanagesthegenerationandcollectionofgatemessa
3、ges,throughwhichmultiplexingofmultipletransmittersisachieved.多點(diǎn)MAC控制功能模塊包括以K功能：a)發(fā)現(xiàn)處理(DiscoveryProcessing):該模訣管理發(fā)現(xiàn)流程，通過(guò)該進(jìn)程發(fā)現(xiàn)ONU并使其注冊(cè)到網(wǎng)絡(luò)屮，同時(shí)對(duì)其RTT進(jìn)行補(bǔ)償。b)報(bào)A?處理(ReportProcessing):該模塊管理報(bào)ft?消息的產(chǎn)生和搜集，0ND通過(guò)該模塊在上行方向向OLT發(fā)送帶寬請(qǐng)求。c)選通處理(GateProcessing)：該模塊管理GATE消息的產(chǎn)生和
4、搜集，通過(guò)該模塊實(shí)現(xiàn)多個(gè)發(fā)送端的復(fù)用。AsdepictedinFigure64-3,thelayeredsystemmayinstantiatemultipleMACentities,usingasinglephysicallayer.EachinstantiatedMACcommunicateswithaninstanceoftheopcodespecificfunctionalblocksthroughtheMulti-pointMACControl.Inadditionsomeglobalvaria
5、blesaresharedacrossthemultipleinstances.CommonstatecontrolisusedtosynchronizethemultipleMACsusingMPCPprocedures.Operationofthecommonstatecontrolisgenerallyconsideredoutsidethescopeofthisdocument.如圖64-3所示，分層的系統(tǒng)可以實(shí)例化多個(gè)MAC實(shí)體，而只使用一個(gè)物理層。每個(gè)實(shí)例化的MAC通過(guò)MPCP和與操作碼(op
6、code)相關(guān)的功能模塊的實(shí)例進(jìn)行通信。此外，多個(gè)實(shí)例丼享一些全局變量。通過(guò)MPCP使用公共狀態(tài)控制來(lái)同步多個(gè)MAC。有關(guān)公共狀態(tài)控制的操作不在本標(biāo)準(zhǔn)規(guī)范的范圍內(nèi)。64.3.1PrinciplesofMulti-PointControlProtocolMulti-pointMACControlenablesaMACClienttoparticipateinapoint-to-multi-pointopticalnetworkbyallowingittotransmitandreceiveframesasi
7、fitwasconnectedtoadedicated1ink.Tndoingso,itemploysthefollowingprinciplesandconcepts:多點(diǎn)MAC控制通過(guò)控制MAC客戶端的接收和發(fā)送使其工作在點(diǎn)對(duì)多點(diǎn)光網(wǎng)絡(luò)屮，而對(duì)MAC客戶端來(lái)說(shuō)就好象連接到一個(gè)獨(dú)享的鏈路上。為了達(dá)到此目的，多點(diǎn)mac控制協(xié)議遵循以n京則：a)AMACclienttransmitsandreceivesframesthroughtheMulti-pointMACControlsublayer.b)TheM
8、ulti-pointMACControldecideswhentoallowaframetobetransmittedusingtheclientinterfaceControlMultiplexer.c)Givenatransmissionopportunity,theMACControlmaygeneratecontrolframesthatwouldbetransmittedinadvanceoftheMACClient
