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To send digital across an analog wire the signal is first laid on top of an analog signal. The process is called "modulation". It's the same thing that's done with television and radio, it's just a different type of signal.

The modulated signal is sent across the wire and the MODEM at the other end receives the signal and decodes it.

The process is called, "MOdulate, DEModulate, or more simply, MODEM.

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