Press 1 to understand how modems work

Mini-Tutorial: Press 1 to understand how modems work

This is a recording of a call to a number with an Interactive Voice Response (IVR) behind it.  You call this number to learn how modems work.

Listen to the audio.

Although the caller presses the wrong button, it nonetheless reveals how modems work: using tones to communicate the binary numbers 1 and 0. 

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