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Bottom up - physical layer
2022-07-06 08:27:00 【tigerdanceonbyte】
Basic knowledge of data communication
Terms related to data communication
Three communication modes
Two data transmission modes 
Code element
rate 、 potter 、 bandwidth
The distortion
Intersymbol crosstalk
Nyquist criterion
Shannon's theorem 
Coding and modulation
Transmission medium
Physical devices
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