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Re: [ecs] internal modems under Linux ? Ingo Pakleppa Sun, 11 Jan 2004 22:18:26 -0800

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Most internal modems are Winmodems. This means that they are implemented
in software, with only the bare essentials being hardware. Basically,
the actual modem - the generation of the dial signals, and the
generation of the telephone line signal happens not in hardware the way
external modems work, but within the Windows driver. So there is no
hardware COMx, but rather the driver just emulates one.

The modem hardware is little more than an AD/DA converter and some
circuitry to allow connecting to a phone line.

This is why many internal modems don't work in Linux.

Some do; go to http://www.linmodems.org This project basically
reimplemented some of the winmodem drivers for Linux. The interface will
be different. At the very least, it will have a different name (for
instance, /dev/esscom or /dev/pctel, and you may also need to talk to
the modem differently than you would talk to /dev/ttySx.

On Sun, 2004-01-11 at 08:18, Mark Gilmore wrote:
> Does anyone know if internal modems may be accessed as "serial" ports (e.g. 
> /dev/ttyS1, etc) under Linux ?
> I.E. if I install such a card, will it be accessible as /dev/ttySx upon 
> reboot ?
> Thanks,
> 
> Mark Gilmore
> http://OmnipotenceSoftware.com
> 
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