(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. If the computer on the network is compared to a cargo station, and the data information is a car, then the network transmission medium is an indispensable road. Now the transmission medium of computer data communication includes wired medium (twisted pair, copper cable, optical fiber) and wireless medium (radio wave, infrared and microwave).)
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