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1 前言 近年来,随着科学的进步和社会的发展,人类已经步入信息时代,我国广播电视网络的建设正朝着既定方向迅速推进。国家广播电视网由省级干线网及在此基础上联网的部级干线网、地区网和本地网组成。传输手段上以光缆为主、数字微波为辅。网络功能上,在保证其“喉舌”性质和“公益性”原则的基础上,充分开发网络资源,提供面向各种用户的互联互通综合业务。
1 Introduction In recent years, with the progress of science and the development of society, mankind has stepped into the information age. The construction of radio and television networks in our country is advancing rapidly in a given direction. National radio and television network by the provincial trunk network and based on the network of ministerial backbone network, regional network and local network. Transmission means to cable-based, supplemented by digital microwave. On the network function, on the basis of ensuring the “mouthpiece” nature and the principle of “public welfare”, it fully develops the network resources and provides the integrated interoperability services for all kinds of users.