传统的信息网为电视网、电话网和新闻报刊媒体网络。在信息高速发展的今天,支撑信息产业的现代电信网已经历了百年演变,从最早的电报网,电话网过渡到现在的宽带多媒体网。通信、计算机和有线电视网三网融合的趋势,又预示了传统电信业务向信息网络过渡的新变革。国际互联网络(Internet因特网)被称为继报纸、广播和电视之后的“第四媒体”,它已构成对传统媒体如报纸、电视、广播和传统邮电通信如信函、电话、电报的强大冲 The traditional information network for television networks, telephone networks and news media network. Today, with the rapid development of information, the modern telecom network supporting the information industry has undergone a century-long evolution from the earliest telegraph network and telephone network to the present broadband multimedia network. The trend of triple play of communications, computers and cable television networks also foreshadowed the new changes in the transition of traditional telecommunication services to information networks. The Internet, known as the “fourth media” after newspapers, radio and television, has constituted a powerful punch against traditional media such as newspapers, television, radio and traditional post and telecommunications such as letters, telephones and telegrams