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数据通信的基本概念１数据和信号门）数据。通信的目的是传输信息。数据是传递信息的实体，它总是和一定的形式相联系的。数据分两类：模拟数据和数字数据。模拟数据反映的是连续信息，如话音、电视图象等；数字数据反映的是离散信息，如电报数字和文字、数字电子计算机输...
The basic concepts of data communication 1 data and signal gate) data. The purpose of communication is to transmit information. Data is the entity that conveys information and is always associated with a certain form. Data is divided into two categories: analog data and digital data. Analog data reflects the continuous information, such as voice, television images, etc .; digital data reflects the discrete information, such as telegraph numbers and text, digital electronic computer ...