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Chapter 44. Upgrading Your Modem > Understanding Modems

Understanding Modems

Modem is short for MOdulate/DEModulate, which is what a modem does to send and receive data from one computer to another. Your computer stores data in digital form. But standard telephone lines transmit information as sound, which is an analog signal. The modem in your computer system converts the digital information in your computer to an analog (sound) signal and transmits the analog signal over telephone lines to another computer. The modem there converts the analog signal that your computer transmitted back into a digital form (see Figure 44.1).

Figure 44.1. How modems modulate and then demodulate signals between PCs.



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