20世纪通信演变过程回顾

Development History of Telecommunications in the 20th Ce ntury

首先简述通信的三大发明和无线电报与有线电话开始应用的情况。继而回顾当初载波电话建设与制造 ,模拟通信向数字通信过渡 ,电缆通信向光纤通信过渡 ,综合业务数字网准备发展 ,以及同步卫星传送国际通信与广播电视的经过。最后说明近年来无线蜂窝网向公众开放 ,数据信息对通信网的冲击 ,以及波分多路加大光纤传输容量等动向。

The paper begins with briefly mentioning the t hr ee great inventions of telegraph,telephone and radio,and application of radio te l egraph and wire telephone in the early period.Then it reviews the installation a n d production of carrier telephone systems,the evolution from analog to digital c om munication,the transition from copper wire to optical fiber communication,the pr eliminary work on integrated services digital network,and the use of satellites for international communication and television.Finally,it explains the recent de ve lopment of cellular network,the impact of data infomation to the communication n etwerk, as well as the application of to the wavelength division multiplexing to enlarge fiber transmission capacity.