【作者】 孙建业；

【导师】 黎福海；

【作者基本信息】 湖南大学 ， 电路与系统， 2004， 硕士

【摘要】 尽管Sonet／SDH设备占据了当今城域网(MAN)市场的最大份额，但是这些产品是为语音传输而设计的，并不能很好地满足数据网络的要求。而吸收了SDH、ATM和吉比特以太网的最好特性的弹性分组环(RPR)正是这样的一种解决方案。 本文是基于开发RPR节点设备而进行的研究，主要做了以下几个方面的工作取得了一定的成果： 1．从分析传统的SDH技术在传送数据业务的若干不足之处入手，进而引出了可以克服这些不足之处并且同时提供数据、话音、视频等综合业务的RPR技术，并稍加分析了其网络体系结构、MAC层和其中的一些关键技术。 2．在查阅了大量本领域及相关领域的国内外期刊、会刊及学术专著掌握了RPR节点的工作原理和机制后，详细的说明了RPR的参考模型、功能抽象模型。并对RPR的关键技术—弹性特点、保护切换、公平算法、空间重利用、拓扑自动发现、广播和组播等技术做了较为详细的描述。 3．在掌握RPR节点宏观模型的基础上，从分析RPR节点的内部构造上着手深入的分析了RPR如何通过不同优先级等级的缓存器高效的处理数据，接收和转发数据的条件，如何防止包在环中无尽的循环，当环出现失效时它是如何解决问题和保护协议规则的若干规定。 4．在对RPR的最新研究动态和本论文研究对象进行深入分析的基础上，制定了切实可行的设计方案，对RPR节点的功能做了一次细分：接收调度、缓存器、速率监测、发送调度、MAC控制子层、带宽控制模块这六大模块，对其中的接收调度、缓存器、发送调度这三个关键模块进行了HDL设计和仿真，并且对接收调度模块进行了代码覆盖，验证了它们的功能实现。更多还原

【Abstract】 Although products based on Sonet/SDH hold the maximum share in MAN market, they are only designed for the transmission of voice and don’t meet the needs of data networks. RPR that adopts the excellence of SDH, ATM and Gigabit Ethernet respectivelyis a better solution to solve this problem.This text is done for designing RPR devices and attains some achievements afterdoing a lot of work as follows:First, from the beginning of analyzing the shortcomings of the transmission data traffic using the tradition SDH, I educe the RPR that can overcome these shortcomings and transmit data, voice and video concurrently, analyze the configuration of its network, MAC and some key techniques in short.Second, after consulting many domestic and overseas journals, proceedings and monograph related to this field and master the principle and mechanism of RPR, I specify the reference model, function model, and describe the key techniques such as resilience, protection switch, fairness algorithm, spatial reuse, topology discovery, broadcast and multicast concretely.Third, basing on grasping the macroscopical model, I analyze the inner configuration and narrate how the RPR node process data efficiently using different priority buffer, the condition of operation of receiving and transferring data traffic, how to prevent the packet from transmitting continuously in the ring , how to solve problems when ring occurs failure and explain the protection protocol rules.Fourth, based on the newest research action and knowing much of the principle of RPR, I set down a feasible designing project and according to its function dividing the RPR into some tiny sections such as receiving module, buffer module, traffic rates policing module, sending module, Mac control sub-layer module and bandwidth control module these six module, describe the principle of receive module, buffer module and send module respectively, design and test this three modules in Verilog HDL.更多还原