What is a modem(modulator and demodulator)?

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modem commonly used send digital data on analog phone lines. http://en.wikipedia.org/wiki/modulation

simplified explanation:
transmitting modem modulates digital data on analog carrier signal - send data on analog voice lines - demodulate analog signal , recover digital data @ receiving modem.

digital 2 state - on or off - computer hard disk contains digital data, ones , zeros.

analog can many varying states - loudspeaker analog device.

luck



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