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I.引言二十五年前终端与远程数据处理设备进行通信还很少.但是,今天由于微电子、程序设计技术和数字通信的发展,终端组成的网络是大多数大公司和很多较小公司所经营业务的必不可少的部分.计算机网络技术上的进展异常迅速.此外,市场反映十分强烈,预测由于使用网络终端可提高生产率,因而终端的数量和应用的范围将会迅速不断地增长.虽然现今数据通信网络使用范围非常广,功能也很强,但是,为适应应用的飞跃发展,需要对网络加以改进.
I. INTRODUCTION Terminals and remote data-processing devices communicate very little twenty-five years ago, but today, as the development of microelectronics, programming technology, and digital communications, the network of terminals forms the backbone of most large corporations and many smaller companies In addition, the market is very strongly reflected in the prediction of the use of network terminals can increase productivity, so the number of terminals and the scope of the application will continue to grow rapidly. Although today’s data communication networks are widely used and powerful, they need to be improved in order to meet the rapid development of applications.