近几年来,一种利用电信网和计算机技术发展起来的通信新业务——可视图文(Videotex)通信,正在世界范围内迅速崛起。由于它是实现信息资源共享的理想通信方式,故已成为各国信息业追求的热点。一、可视图文通信业务可视图文是一个公用的开放式信息服务系统,它利用现有的公用电话交换网和公用分组数 In recent years, Videotex, a new communications business that has developed through the use of telecommunications networks and computer technology, is rapidly gaining ground worldwide. Because it is the ideal way to realize the sharing of information resources, it has become a hot spot in the information industry in various countries. First, the visual communications business Pictorial is a public open information service system, which uses the existing public switched telephone network and public group number