The analogue telephone is the primary communication tool in use today and its use with modems has provided the main way of linking computers together. The explosion in use of the Internet via modems to local service providers demonstrates the power behind linking and communicating with computers. As a result, the division between the telephone, the FAX machine and the computer is becoming smaller every day. To understand how the telephone system works and how it is being used by computers, this chapter provides a tutorial on the technology behind the telephone.
The plain old telephone system (POTS) or public switched telephone network (PSTN) refers to the analogue telephone. The term POTS is frequently used in the US ...
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