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Modems
A modem allows a point-to-point data link to be carried over the
analog telephone system (PSTN, also called POTS, or Plain Old
Telephone System), thus:
The modem can:
- Dial the telephone number of another modem under program
control, or answer the phone
- Negotiate a connection at the highest common bit rate that each
modem can support
- perform"on the fly" data compression
- perform (under some conditions) error detection and
correction
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