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数据通信1958年问世于美国,它是继电报、电话之后出现的一种新颖的通信方式。电报和电话只能在人与人之间沟通信息,原封不动地传送人们的话音或电码符号,属于“人—人”通信。数据通信则是让人与计算机对话,甚至让计算机与计算机之间建立起联系,属于“人—机”通信或“机—机”通信。利用数据通
Data communications came out in 1958 in the United States. It is a novel communication method that appears after telegraph and telephone. Telegraphs and telephones can only communicate information between people, send people’s voice or code symbols intact, belong to “people - people” communication. Data communications allow people to talk to computers and even make connections between computers and computers. They belong to “people-to-machine” communications or “machine-to-machine” communications. Use data pass