4. Serial Port and Modem Basics
You don't have to understand the basics to use and install a modem. But understanding it may help to determine what is wrong if you run into problems. After reading this section, if you want to understand it even better you may want to see How Modems Work in this document (not yet complete). More details on the serial port (including much of this section) will be found in Serial-HOWTO.
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