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 dialer 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 (C) 2007 Ulrich Hansen, Mainz (Germany), modified 2010
and 2020 by W.Spiegl.
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"GNU Free Documentation License 1.2".