毕业设计论文 外文文献翻译 通信工程专业.doc

hebei united university毕业设计翻译（汉译英）学生姓名： 专业班级：07通信1班 学 院：信息工程学院指导教师： 2008年06月08日河北联合大学信息工程学院原 文多业务传送平台（mstp）是对传统的sdh设备进行了改进，在sdh帧格式中提供不同颗粒的多种业务、多种协议的接入、汇聚和传输能力，是目前城域传送网最主要的实现方式之一。基于sdh 的mstp 比较适合于已大量敷设sdh 网络的电信运营商，可以灵活有效地支持迅速发展的分组数据业务，同时可以保证对多业务的统一网络管理，实现从电路交换网向分组交换网的平滑过渡。在近期中国移动以话音等tdm 业务为主、数据业务为辅的情况下，选择以sdh为基础的mstp建设方案是稳妥且可持续发展的策略。基于sdh的mstp将是今后几年城域光传送网建设的重点。综合来说，基于sdh 的mstp具有以下技术特点。我们在使用mstp技术组网应用前，一定要先对它有一个清楚的技术定位，这样才能做到很好地利用它，并在应用中体现出它的优点。mstp技术是适应城域综合传送网建设要求，从sdh设备发展起来的新兴综合传送技术，其基本特征是通过对以太数据帧和atm信元的封装，实现基于sdh的多业务综合传送。从本质上讲，mstp技术定位在城域传送网的范畴之内，主要目的是为了实现多业务的综合传送，其完善的二层交换等数据链路层功能也仅仅是为了提高数据业务的传送效率。但是，随着与其它网络技术的不断融合发展，如rpr、mpls等技术，mstp技术的应用领域和组网思路不断地革新，其设备逐渐跨越了原有的城域传送网和业务网之间的界限，反映了业务网与传送网在城域范围内融合的发展趋势，主要表现在以下两个方面：1以mstp为主体的传送网本身逐步通过网元出租等方式逐步向业务网转变，例如虚拟传送网等等。2mstp技术表现出逐步替代其它数据业务网络的发展趋势，也就是部分数据链路层功能的替代，如替代atm网络实现dslam的接入；当然也有少数厂商的mstp传送设备实现了部分第三层功能。但是在实际网络部署中，需要重点考虑如何围绕mstp技术开展业务，以及考虑利用mstp技术能够替代哪些现有数据业务网络的功能。mstp网络的业务类型支持epl（ethernet private line，以太网专线）业务、evpl（ethernet virtual private line，以太网虚拟专线）业务、eplan（ethernet private local area network，以太网专用局域网）业务和evplan（ethernet virtual private lan，以太网虚拟专用局域网）业务本设计是根据客户的需求，进行规划设计，运用华为光智能光传输设备optix osn 3500及optix t2000传送网子网级综合网管系统完成epl、evpl业务配置，最终设计达到满足客户需求。本设计过程之工程需求：在某城的a、b、c、d四地之间需要组建新的通信网络。1.用户a有两个分部位于ne1和ne3，要进行以太网通信，需要10mbit/s带宽。 2.用户b有两个分部位于ne1和ne3，要进行以太网通信，需要20mbit/s带宽。 3.用户a和用户b的业务需要相互隔离的。 4.用户a与用户b的以太网设备提供100mbit/s以太网接口，工作模式为自协商，均不支持vlan。5.用户d两个分部分别位于ne1和ne2，需要互相通信。 6.用户e两个分部分别位于ne1和ne2，需要互相通信。 7.用户d和用户e的业务需要相互隔离，但业务量在时间上有互补性，可共享20mbit/s带宽。 8.用户d和用户e的以太网设备提供100mbit/s以太网电接口，工作模式为自协商，均不支持vlan标签。工程规划：由4个optix osn 3500网元组成stm-16的二纤双向复用段保护环带stm-4的无保护链。ne1、ne2、ne3、ne4为环上的4个网元，其中ne1为网关网元。使用以太网透传单板或以太网交换单板都可以实现a、b、c、d间epl业务。在t2000上设置网元的以太网接入功能。本设计使用以太网交换单板实现a、b、c、d间epl业务配置。使用共享vctrunk的evpl（vlan）实现a、b、c、d间的evpl业务。mstp不是一个成型的封闭标准体系，它是依托于sdh平台的技术及应用，具体采用什么技术取决于运营商建网的思路以及为最终用户提供何种类型的业务。mstp体系中有大量的数据标准的引用，比如以太网标准，在此层面上的建议和协议层出不穷。究竟将如何将何种技术纳入mstp平台，必然需要不断的摸索和尝试。mstp技术的出现和应用代表了一种新的网络变革，不仅是技术上的，也是管理上的，更是观念上的。它为城域网中的综合业务提供了解决方案，是现有数据网络的补充，为传统sdh注入了新的活力。mstp 这一多业务传送平台正得到愈来愈多通信运营商的青睐，其传输层功能正从传输语音向传输宽带数据转换，并且由于采用了新一代的sdh 技术(gfp、vcat、lcas)、集合数据二层交换和atm交换提供高效、灵活的和可靠的数据传输。mstp 对城域网进行整合，将分离的、重叠的网络整合成一个多业务、灵活的、易管理的低成本网络。随着rpr、mpls 等新技术的成型, 以及相关新技术的开发。mstp 在城域网的构建中会越来越重要。城域网的最大特点是多样性，每种技术都有其应用空间，我们不能简单地以一种方式来决定各个地区城域网的发展，应根据城市规模、业务类型、用户分布等选取合理的技术，并充分考虑如何兼顾更好利用已有网络资源和向未来演进之间的关系，为运营商创造最大的投资回报。相信随着技术和标准的逐步完善和发展，mstp技术和设备会迎来更加美好的明天。译 文multi-service transport platform (mstp) has improved the traditional sdh equipment ,and formatted in a variety of services in the sdh frame provided by different particles, multi-protocol access, aggregation and transmission capacity, it is one of the most important metro transport network way.the mstp based on sdh has a lot more laid for sdh network carriers the flexibility to effectively support the rapid development of packet data services, while ensuring a unified multi-service network management, from a circuit-switched networks to packet switched networks smooth transition. china mobile in the near future to voice and other tdm-based services, data services, supplemented by the case, select the sdh-based mstp-building program is a sound and sustainable development strategies. sdh-based mstp will be the next few years, the construction of metro optical transport network key. in summary, the sdh-based mstp has the following technical characteristics.1. it has large cross-connect capacity to support vc-4/vc-3/vc-12 various levels of cross-connect and continuous cascade or virtual concatenation processing.2. it provide a rich multi-service (pdh / sdh, atm, ethernet / ip, image services, etc.) interface, you can add or replace the interface module, flexible to adapt to changes in business development.3. ethernet and atm services with transparent transmission or floor of the exchange capacity of the transmission link bandwidth can be configured, and support vlan, flow control, operations and port aggregation or statistical multiplexing function.4. complete with a variety of protection mechanisms (sdh, atm, ethernet / ip) networking features and flexible.5. it can achieve a unified, intelligent network management, has good compatibility and interoperability.before we use the mstp technology networking applications, it must first have a clear technical position, so as to achieve good use of it and reflect it in the application of benefits. mstp technology is integrated metro transport network to adapt to requirements of the building, from the sdh equipment developed new integrated transmission technology, its basic features are data frames by ethernet and atm cell encapsulation, sdh-based multi-service integrated delivery. in essence, mstp technology to locate in metro areas within the transport network, the main purpose is to achieve a comprehensive multi-service delivery, its perfect layer 2 switching features such as data link layer only to improve the delivery of data services efficiency. however, as with other network technology convergence, such as rpr, mpls and other technologies, mstp technology applications and networking ideas innovation constantly, gradually their equipment across the metro transport network and existing business networks between boundaries, reflecting the business network and transmission network in the metropolitan area integration trends, mainly in the following two aspects:1. the mstp as the mainstay of the transport network itself gradually through the leased line, etc. and gradually shift to the service network, such as virtual transmission network and so on.2. mstp technology to show the gradual replacement of other data services network development trend, which is part of the data link layer functions instead as an alternative to achieve the dslam, atm network access; course, there are few manufacturers of mstp transmission equipment to achieve some layer 3 functionality . but in the actual network deployment, it is important to consider how to conduct business around the mstp technology, and consider the use of mstp technology which can replace the existing data service networks.the types of mstp network business：support epl (ethernet private line, ethernet private line) service, evpl (ethernet virtual private line, ethernet virtual private line) services, eplan (ethernet private local area network, ethernet private lan) service and evplan (ethernet virtual private lan, ethernet virtual private lan) service。the key technologies mstp: mstp of gfp, mstp of virtual concatenation, mstp of lcas, mstp of the rpr and mpls.the design first epl, evpl, eplan, evplan comparison service and business needs according to the user, using huaweis optical network equipment, huaweis optical network optix osn and the sub-network management system, the customer needs t2000 epl, evpl service design. design requirements include application engineering, project planning, system configuration. demonstrate the significance of the engineering design services for the bandwidth requirements of current data is an effective solution.in a city of a, b, c, d is needed between four to form a new communications network.1 user a has two branches located in ne1 and ne3, to make ethernet communication, the need 10mbit / s bandwidth.2 user b has two divisions located in ne1 and ne3, to conduct an ethernet communication needs 20mbit / s bandwidth.3 user a and user b, isolated from each others business needs.4 user a and user bs ethernet devices 100mbit / s ethernet interface, auto-negotiation mode, do not support vlan.5 user d and two divisions are located in ne1 ne2, need to communicate with each other.6 user e and two divisions are located in ne1 ne2, need to communicate with each other.7. user d user e business needs and isolated from each other, but in time the volume of business are complementary, shared 20mbit / s bandwidth.8 users d and e, ethernet equipment users 100mbit / s electrical ethernet interfaces, auto-negotiation mode, do not support vlan tags.project planningoptix osn 3500 by the four stm-16 network element composition of the two-fiber bidirectional multiplex section protection ring with stm-4 unprotected chain. ne1, ne2, ne3, ne4 of the four ring network element, which is the gateway network element ne1.using the ethernet or ethernet switch board through board flyers can achieve a, b, c, d between the epl business. set on the t2000 ethernet access network element functions. this design uses ethernet switching sbc a, b, c, d between the epl service configuration.shared vctrunk the evpl (vlan) to achieve a, b, c, d between the evpl mstp is not a standard system for closed molding, it is relying on sdh technology and application platform, specifically the use of any technology depends on the idea of building a network operator as well as end-user what type of business. the mstp system in a large number of standard reference data, such as the ethernet standard, at this level after another on the recommendations and agreements. how exactly what technology will be incorporated into mstp platform, the inevitable need to constantly explore and try. mstp technology and the emergence and application of new network represents a change not only the technical but also management, it is conceptual. man it provides comprehensive business solutions that complement existing data networks, the traditional sdh has injected new vitality.multi-service transport platform mstp is that more and more telecom operators to get the favor of their transport layer functions are transferred from voice to broadband data conversion, and thanks to a new generation of sdh technology (