英语翻译随着业务需求驱动网络向ALLIP化发展,分组化传输技术成为下一代传输网的主流IP承载技术是大势所趋.在城域网这个

英语翻译
随着业务需求驱动网络向ALLIP化发展,分组化传输技术成为下一代传输网的主流IP承载技术是大势所趋.在城域网这个业务需求最复杂、技术碰撞最激烈、新技术不断涌现的区域,任何先进技术的引入不是一蹴而就的,尤其是面对庞大而成熟的SDH/MSTP网络、不断延伸覆盖的IP城域网以及正在兴起的全业务接入网,PTN在网络中的定位以及和其他网络的关系均需要重新思考.同时,随着PTN步入商用化阶段,基于PTN设备的具体组网策略已成为各移动运营商关注的焦点.PTN技术一方面可以为整个电信网络向IP化、宽带化的演进提供电信级技术支持,另一方面还可以有效降低全网IP化、宽带化的建设和运维成本.PTN技术保持了传统的SDH传送网的特点：良好的网络拓展性、丰富的操作维护（OAM）、快速的保护倒换、利用网管系统建立连接等.同时增加了适应数据业务的特性：分组交换、统计复用、分组QoS机制、灵活动态的控制面.这些优势是传统以太网和增强以太网技术所无法比拟的.事实上PTN技术已经成为公认的下一代网络技术之一,未来将广泛应用于城域网的建设.
本论文在讨论城域网中PTN网络建设分析研究的基础上,探讨了PTN网络建设的关键问题,包括对运营级需求、实施的关键技术、可选的技术方案和引入应用策略分析,随后以根据某地城域网现有的网络结构进行分析,在了解城域网中PTN网络建设基本思路的基础上提出可行的建设方案.
关键词：城域网；PTN网络；网络规划；下一代网络技术；可行方案

With business demand drive network develop to ALLIP, packetizing transmission technology become the next main IP carrying technology representation the general trend. In metropolitan area network, where the business demand is the most complex, violent in technology clash, ceaselessly emerged new technology, introducing any advanced technology can not accomplish at one stroke, especially in the face of large and mature SDH/MSTP network, keeping on extend the coverage of IP metropolitan area network as well as rising full service access network, positioning PTN in network and other network relationship need to rethink. At the same time, along with the PTN entered the commercial stage, based on the PTN device specific networking strategy has become the focus of the mobile operators. On one hand, PTN technology can provide the whole telecommunication network to the IP, broadband evolution telecom technical support, on the other hand it can effectively reduce the construction and maintenance cost of the IP, broadband service. PTN technology keeps the traditional SDH network characteristics: good network development, lavish operation and maintenance (OAM), fast protection switching, using network management system to establish a connection. Meantime it increases the adaptation data business characteristics: packet switching, statistical multiplexing, group QoS method, and flexible control surface. The traditional Ethernet and Ethernet technology is unable to compare with these advantages. In a fact, PTN technology has recognized as one of the next generation network technology , will be widely used in Metro construction in future. this paper basis on analyzing PTN network construction in the metropolitan area network, discusses the key issues in the construction of PTN network, including the operation level demand, implementation of the key technology, optional technical scheme and introduction of the application strategy analysis . after this, analysis the existing network structure based on a metropolitan area network , on the basis of understanding basic ideas of construction PTN network in a metropolitan area network put forward feasible construction scheme.
Key words: metropolitan area network; PTN network; network planning; next generation network; feasible scheme