Chapter 25. How PCs Connect to the Internet
YOUR PC is a digital device. It accomplishes most of its tasks by turning a series of electronic switches on or off. A binary 0 represents a switch that is turned off; a binary 1 indicates that the switch is on. There is no in-between designation. A graph of digital code would look like this:
The traditional telephone system is an analog device, designed—at a time when digital electronics was unknown—to transmit the diverse sounds and tones of the human voice. Those sounds are conveyed electronically, in ...
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