从OSI参考模型看图文电视信息服务业务的扩充

Information Service Enhancement of Teletext Based on Open System Interconnection Reference Mode

图文电视作为大众化信息服务手段，是建立在开放系统互连（OSI）参考模型基础之上的，各层之间具有相对独立性，通过分析图文电视体系各层次功能分工和探讨分阶段实施交互式业务的方法，指出了图文电视业务扩充在技术上的可能性及利用现有电视信道进行专业信息服务的良好前景。

As a public information service,the teletext system is built on thebasis of OSI reference mode. The layers are independent from each other andperform specific fuctions. By analysing the teletext system hierarchy function,the technological possibility for the interactive teletext information service en-hancement and its broad prospects are described in this paper.