Moreover , there are two superiority of the bandwidth and speed in the existing cable television network . therefore the equipment manufacturers and the service providers must first consider how to fully make uses of the band resources of the cable network , and develop integrated services digital network of multimedia 现有的有线电视网具有带宽与速度两大优势,因此如何充分利用有线网的带宽资源,开展宽带多媒体综合业务数字网,是广大设备和服务提供商应该首先考虑的问题。
Sichuan wide - band multimedia network expansion project is " nine - five " important construction project . this thesis is based on the target of sichuan telecom development the developing trends of transmission techniques . the thesis collected the necessary data from the different areas in sichuan province 本文以四川省电信公司经营目标为基准，以多媒体网络技术的发展趋势及采用技术的先进性为依据，按照现有网络的实际情况及各地、市、州的实际业务需求对现有宽带多媒体网进行了改造和扩容。
The second chapter is summarization which introduces the development situation , main construction and function of data center . the third chapter arise the principle of designing excellent network system . the forth part aims at the practical requirement of chongqing wide - band multimedia information platform data center , put forward detailed design of its network system architecture 第一章绪论，简要介绍了目前论文选题及研究意义和论文的工程项目背景；第二章概述，介绍了数据中心在国内外的发展及现状，同时介绍了数据中心的主要构成及其主要功能；第三章提出了设计优秀网络系统应该遵循的设计原则；第四章针对重庆宽带多媒体信息平台数据中心实际需求，提出其网络系统的分块详细设计。
This paper firstly investigates stb ' s variety , architecture and its study status domestic and abroad . then , on the basis of particular analysis about the docsis and dvb - c protocols , the author lists the disadvantages of the stbs which are popular in the market now . these stbs utilize the telephone line to transmit upstream messages , which leads to the feature of narrow upstream bandwidth . this feature restricts the realization of wide - band multimedia integrated services and future development 本论文首先对数字电视机顶盒的类型、体系结构和国内外研究现状进行了仔细的研究，在对docsis协议和dvb - c协议细致分析的基础上，断定目前市场上的stb因利用电话线进行回传交互，上行带宽小，不能实现宽带多媒体综合业务，不适应未来发展的需要。
Future mobile communication will be wide - band multimedia communication . the adoptive technologies include wideband cdma , software radio , intelligent antennas , ofdm ( orthogonal frequency division multiplexing ) and digital processing device . ofdm and software radio are both the charming technology for future mobile communication 移动通信的发展趋势是宽带多媒体通信，所采用的技术包括宽带cdma 、软件无线电( softwareradio ) 、智能天线( intelligentantennas ) 、正交频分复用( ofdm )和数字处理设备。
Now , guangdong nortel has become a key vendor to china telecom , china netcom , china mobile , china unicom and other network carriers , working together with her customers in many countries to help delivering innovative network capabilities 迄今为止，广东北电已经为全国多个地区的固定网络、无线网络和宽带多媒体网络的新建和扩建工程提供设备，客户涵盖了中国主要的电信运营商，包括中国电信、中国移动、中国联通、中国网通及其他专用网络，遍布27个省、市、区以及全球多个国家。
The former includes vod , remote medicine , virtual shop , electronic shopping , etc . currently , it is possible to provide broadband multimedia service from the perspective of technology . however , there will be some time to go before it becomes popular , for subscriber access needs a relatively large bandwidth and the rent of circuits is relatively high 宽带多媒体业务如vod （视频点播） 、远程医疗、虚拟商店、电子购物等。从技术角度来看，提供宽带多媒体业务，目前虽已具备现实可能，但尚难普及。究其原因是用户接入要有比较大的带宽，而电路租费比较高。
