EPON网络规划研究与分析

EPON网络规划研究与分析ResearchandanalysisofEPONnetworkplanning摘要随着信息科技的高速发展,用户对传送信息网络的要求日益趋向高速化和精确化。严峻的形式对传统的中国电信宽带网络提出了挑战,迫使传统接入网面临转型局面。以太网无源光网络(EPON)是一个点到多点的光接入网,利用无源光网络的树型拓扑结构,采用以太网信号方式来完成多种业务的传输。EPON是几种最佳技术和网络结构的结合,EPON技术由于其维护简单,具有节省光纤资源、传输带宽较高、对网络协议透明以及较高性价比的特点,在光接入网中扮演着越来越重要的角色,并在未来很长时间内将保持竞争优势。本文首先介绍了宽带接入技术的几种主要方式和它们的特点,并在比较了三种光纤到户技术中EPON、GP0N和P2P-Ethernet的基础上总结了EPON技术的优势。其次,阐述了EPON的网络结构、工作原理及关键技术,并对几种成熟的EPON组网方式进行了分析。最后本文研究讨论了EPON网络的设计与规划,并在此基础上分析比较了三个工程案例,总结了FTTN、FTTB和FTTH三种方式在实际建设中的适用场景和工程效果。关键词:EPON,OLT,ONU,动态带宽分配(DBA),多点控制协议(MPCP)测距与延迟技术AbstractWiththehigh-speeddevelopmentofinformationtechnology,people'sdemandstoinformationnetworkincreasinglytrendtohighspeedandhighprecision.SevereformposeschallengestotraditionalChinatelecombroadbandnetwork,forcingtraditionalaccessnetworktotransit.EthernetPassiveOpticalNetwork(EPON)isapointtomultiple-pointopticalaccessnetworkwhichusesthetreetopologyconfigurationtosupplymulti-servicetransitionwithEthernetsignalform.EPONisacombinationofseveralbesttechnologiesandthenetworkstructure.Becauseofitssimplemaintenanceandcharacteristicssuchassavingfiberresources,highbandwidth,highperformance-costratio,andetc,EPONtechnologyplaysamoreandmoreimportantroleinopticalaccessnetwork,andwillmaintainacompetitiveadvantageinthefutureforalongtime.Firstly,severalmainaccesswaysofbroadbandaccessnetworkareintroducedinthisthesis.Basedoncomparingthreekindsoffibertothehometechnologies(EPON,GPONandP2P-Ethernet),theadvantagesofEPONtechnologyisstated.Secondly,theEPONnetworkstructure,workingprincipleandkeytechnologiesofEPONnetworkareexpounded,andseveralmatureEPONnetworkmodesareanalyzed.Finally,theEPONnetworkdesignandplanningarestudiedanddiscussedinthisthesis.Basedontheanalysisandcomparisonofthethreeengineeringexamples,theapplyingsceneandengineeringeffectofFTTN,FTTBandFTTHinactualconstructionaresummarized.Keywords:EPON,OLT,ONU,DynamicBandwidthAllocation,Multi-pointControlProtocol,RangeandDelayTechnologyI目录第-章绪论.......................................................................................................................11.1宽带接入网的发展...........................................................................................11.2宽带接入技术...................................................................................................11.2.1DSL接入方式..........................................................................................11.2.2以太网接入方式......................................................................................21.2.3光纤接入方式..........................................................................................21.2.4主要接入方式比较..................................................................................21.3FTTX技术.......................................................................................................31.3.1P2P和P2MP..........................................................................................31.3.2P2P-Ethernet.............................................................................................41.3.3APON(ATMPON)...................................................................................41.3.4EthernetPON(EPON)........................................................................41.3.5GigabitPON(GPON)..........................................................................51.4主要FTTX方案的比较...................................................................................51.5论文主要内容和结构安排...............................................................................7第二章EPON技术...........................................................................................................92.1EPON技术特点................................................................................................92.2EPON的网络结构..........................................................................................102.3EPON协议及原理..........................................................................................112.3.1EPON协议找.........................................................................................112.3.2EPON工作原理.....................................................................................132.4EPON关键技术..............................................................................................152.4.1MPCP协议............................................................................................152.4.2ONU的发现、注册和认证技术..........................................................15`2.4.3OLT的测距技术..................................................................................162.4.4动态带宽分配技术................................................................................182.4.5OAM管理.............................................................................................192.5本章小结.........................................................................................................20第三章EPON网络设计.................................................................................................213.1光路设计原则.......................................................