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一、前言随着计算技术和通信技术的发展,计算机网发展极为迅速,为计算机技术开辟了崭新的应用领域。计算机网已成为衡量一个国家科学技术水平的重要标志,它的建立和发展,必将对经济、国防、科学技术和社会生活带来深刻的影响。在计算机网中,终端设备作为人-机对话的工具,其重要性是显然的。近年来,终端设备的数量日益增加并朝着多功能、智能化方向发展。电话机在终端设备中所占比例特别大,据国外电信业务量的预测,到1985年,电话用户
I. Preface With the development of computing technology and communication technology, the development of computer network is extremely rapid, opening up a brand-new application field for computer technology. Computer network has become a measure of a country’s science and technology an important symbol of its establishment and development, it will certainly have a profound impact on the economy, national defense, science and technology and social life. In the computer network, the importance of the terminal device as a human-machine dialogue tool is obvious. In recent years, the number of terminals has been increasing and moving in a multi-functional and intelligent direction. Telephones in the proportion of terminal equipment is particularly large, according to foreign telecom traffic forecast, by 1985, telephone users