EPONEPON 网络规划研究与分析网络规划研究与分析Research and analysis of EPON network planning摘要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AbstractAbstractWith the high-speed development of information technology, peoples demands to information network increasingly trend to high speed and high precision. Severe form poses challenges to traditional China telecom broadband network, forcing traditional access network to transit. Ethernet Passive Optical Network (EPON) is a point to multiple-point optical access network which uses the tree topology configuration to supply multi-service transition with Ethernet signal form. EPON is a combination of several best technologies and the network structure. Because of its simple maintenance and characteristics such as saving fiber resources, high bandwidth, high performance-cost ratio, and etc, EPON technology plays a more and more important role in optical access network, and will maintain a competitive advantage in the future for a long time.Firstly, several main access ways of broadband access network are introduced in this thesis. Based on comparing three kinds of fiber to the home technologies (EPON, GPON and P2P-Ethernet),the advantages of EPON technology is stated. Secondly, the EPON network structure, working principle and key technologies of EPON network are expounded, and several mature EPON network modes are analyzed. Finally, the EPON network design and planning are studied and discussed in this thesis. Based on the analysis and comparison of the three engineering examples, the applying scene and engineering effect of FTTN, FTTB and FTTH in actual construction are summarized. Key words: EPON, OLT, ONU, Dynamic Bandwidth Allocation, Multi-point Control Protocol, Range and Delay TechnologyI目录目录第第- -章绪论章绪论 .1 1.1 宽带接入网的发展 .1 1.2 宽带接入技术 .1 1.2.1 DSL 接入方式.1 1.2.2 以太网接入方式 .2 1.2.3 光纤接入方式 .2 1.2.4 主要接入方式比较 .2 1.3 FTTX 技术 .3 1.3.1 P2P 和 P2MP.3 1.3.2 P2P-Ethernet.4 1.3.3 APON (ATMPON).4 1.3.4Ethernet PON (EPON).4 1.3.5Gigabit PON (GPON).5 1.4 主要 FTTX 方案的比较 .5 1.5 论文主要内容和结构安排 .8 第二章第二章 EPONEPON 技术技术 .9 2.1 EPON 技术特点.9 2.2 EPON 的网络结构.10 2.3 EPON 协议及原理.11 2.3.1 EPON 协议找.11 2.3.2 EPON 工作原理.13 2.4 EPON 关键技术.15 2.4.1 MPCP 协议.15 2.4.2 ONU 的发现、注册和认证技术.15 2.4.3 OLT 的测距技术.16 2.4.4 动态带宽分配技术 .18 2.4.5 OAM