“中国信息高速公路”的组成部分─—有线电视广播网络天津邮电学校田国１“中国信息高速公路”势在必行中国邮电通信事业，自改革开放以来，发展迅猛，信息交换的数字程控化，中继传输的光缆数字化、移动通信、数据分组交换等都赶上世界先进水平。然而，，随着“电话热”... “China’s information superhighway” part of the ─ ─ cable television network Tianjin post and telecommunications school Tian Guo 1 “China’s information superhighway” is imperative China’s post and telecommunications, since the reform and opening up, the rapid development of digital exchange of information programmed , Trunk cable digital transmission, mobile communications, data packet switching and so keep up with the world advanced level. However, with “phone hot” ...