(In the network engineering communication system, a transmission medium is required between the computer and the network equipment for the connection and transmission of information and data. Assuming that the computer hooked on the network is compared to a freight station, and the data information is a car, then the network transmission medium is an indispensable road. At present, the transmission medium of computer data communication includes wired medium (twisted pair, copper coaxial cable, optical fiber) and wireless medium (radio wave, infrared and microwave).)
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