论文部分内容阅读
信息化社会是当今各国追逐早日进入的目标,因而建设国家信息基础结构是个热点,其主体是信息网络,亦即信息资源网络和信息通讯,美国处于世界科技领先地位,其最大的高速数据通讯网是美国国家科学基金会的交互式网络(即Internet)。不仅连接大学、研究实验室和军事基地,还通过卫星、光纤线路联接150多个国家,是1万多计算机网络的网际之网,但此网尚不能满足话音、文字,图像和影像等多媒体信
Therefore, the construction of the national information infrastructure is a hot topic. Its main body is the information network, that is, the information resource network and the information and communication. The United States is in a leading position in the world in science and technology. Its largest high-speed data communication network is NSF Interactive Network (Internet). It not only connects universities, research laboratories and military bases, but also connects more than 150 countries via satellites and optical fiber lines. It is a network of more than 10,000 computer networks. However, this network can not meet the demand for multimedia messages such as voice, text, images and video