一、数据通信的概念国外有人把数据通信称为继电报通信、电话通信之后的第三代通信。国内也有人认为“数据通信”一词概念含混,不太确切。主张用“计算机网络”或“计算机通信”来取代它。但是不管怎样,“数据通信”一词在国内外都有人用,所以有必要来探讨一下它的基本含义。什么是数据通信呢?用一句话来说,就是计算机之间或计算机与终端之间的通信。通俗一点说,就是计算机和计算机(或终端)打电话。这就意味着,数据通信过程中,主角是电 First, the concept of data communications Some people abroad data communications known as the Telegraph communications, telephone communications after the third generation of communications. Some people in the country also think the concept of “data communications” is ambiguous and not exactly correct. Advocate to use “computer network” or “computer communication” to replace it. However, in any case, the term “data communications” is used both at home and abroad, so it is necessary to explore its basic meaning. What is data communication? In a word, is the communication between computers or between computers and terminals. To put it plainly, the computer and the computer (or terminal) call. This means that the data communication process, the protagonist is electricity