摘 要
91年五行属什么
宽带IP城域网是IP骨干网在城域范围内的延伸和覆盖，是覆盖城市、郊区及其所辖的县市和地区，提供城域多业务的网络。宽带IP城域网承担集团用户、商用大楼、智能小区的业务接入和电路出租任务，具有覆盖面广、投资量大、接入技术多样和接入方式灵活的特点。IP城域网界于全国骨干网或省网和用户驻地网或终端用户之间，将企业和个人客户的各种业务连接到骨干网中。
本规范主要规定了基于IPv4的我国宽带IP城域网的网路结构、网路组织、路由协议、路由策略、网间互联、网络性能、服务质量、网络管理、网络安全、传送技术、业务、编号方案、地址分配设备配置原则、机房设计等。
宽带IP城域网的发展由于其应用的复杂性，出现了多样性的局面。在光缆网上直接架构吉位以太网（将来是10GbE ） 宽带IP城域网正在成为主流。弹性分组环RPR将发展成新标准。这些将为竞争的运营商广泛采用。而从SDH演化的多业务平台将更多为传统运营商用做向IP业务过渡的工具。原有基于ATM的多业务平台将逐渐退出这一领域。对于Tb/s以上的宽带城域核心网，将采用由DWDM和光交换机（波长路由器）构成的光多业务平台。运营商建设宽
让我轻轻地告诉你
带城域网采用何种方案、设备取决于它的市场定位，服务对象要求以及它所拥有的资源情况，进行综合分析做出选择。荒岛生存记
关键词：宽带IP城域网 主干网 IPv4 弹性分组环RPR
现代情诗
Abstract
Broadband IP intracity networks is IP backbone in metro within the scope of the extension and cover,is covering city,suburbs and the virtue of counties and regions, providing more business network metro. Broadband IP intracity networks bear group urs, commercial buildings, intelligent community business access and circuit rent task, have coverage, amount invested large,access technology diver and access the characteristics of flexible mode. IP man bounded littered backbone or provinces nets and ur stations nets or end-ur between, will enterpri and individual customers' various business connected to the backbone.
脱粒机打一成语
This specification mainly provides the Chine broadband IP bad on IPv4 construction.this network structure, network organization, routing protocols, routing strategies, nets, network performance between interconnected, quality of rvice, network management, network curity, transmission technology, business, Numbers scheme, address assignment device configuration principle, the engine room design, etc.
The development of broadband IP intracity networks becau its application complexity, the emergence of a diversity of the situation. In fiber net direct architecture auspicious bits Ethernet (the future is 10GbE) broadband IP intracity networks are become mainstream. Elastic grouping ring into new standard RPR will develop. The will be widely ud for competitive operators.More from the SDH evolution will be more business platform for the traditional operators ud the tools to IP business transition. The original more business platform bad on ATM will gradually to withdraw from the field. For Tb/s more broadband metro core nets,will u the light switch by DWDM (wavelength router) constitute light much business platform. Operators construction broadband metropolitan design, equipment adopting which depends on its market position, rvice object request
仿写散步and it has the resources comprehensive analysis, choo.
Keywords: Broadband IP intracity networks Backbone Network IPv4 standard RPR
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