# Networking FreeDOS - Modem

      Modem (from modulator-demodulator) is a device that modulates an analog
      carrier signal to encode digital information, and also demodulates such
      a carrier signal to decode the transmitted information.
      The goal is to produce a signal that can be transmitted easily and
      decoded to reproduce the original digital data. Modems can be used
      over any means of transmitting analog signals, from driven diodes to
      radio. There are basically three different types of modem available
      for use with desktop PCs. External ones that plug into the serial
      port of your PC. And internal ones that are installed in either the
      PCI or ISA slots. These latter can be subdivided into WinModems and
      full modems. Only the later will run under DOS (see the similar
      problem with Linux!) It is necessary to use either a SLIP or more
      usually a PPP driver, which acts as an Ethernet packet driver, if
      you wish to connect to a remote network via the phone line.
      The TCP/IP stack is then loaded afterwards. Both the Novell and the
      Microsoft TCP/IP stacks included
      a dialler program and SLIP/PPP drivers with the main software.
      With the introduction of Broadband, Cable and ADSL modems have also
      appeared, these either fake it as Ethernet devices or will not work
      under DOS.

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      Copyright © 2007 Ulrich Hansen, Mainz (Germany), modified 2010
      by W.Spiegl.
      For more information see here.

      Permission is granted to copy, distribute and/or modify this document
      under the terms of the GNU Free Documentation License, Version 1.1 or
      any later version published by the Free Software Foundation.
      A copy of the license is included in the section entitled
      "GNU Free Documentation License"