Re: Does Linux support acoustic couplers ? ? ?
From: Moe Trin (ibuprofin_at_painkiller.example.tld)
Date: 11/26/04
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Date: Fri, 26 Nov 2004 16:46:46 -0600
In article <pan.2004.11.26.13.53.08.110655@remove.this.yahoo.co.uk>,
Jules wrote:
>> In comp.os.linux.hardware Hans-Marc Olsen <mallet_riveter@yahoo.co.in> wrote:
>>> I cannot afford a modem for my computer, so I wonder if Linux supports
>>> a 150 BAUD acoustic coupler ?
That poster was a troll by a contestant in a hacking contest.
>> Acoustic couplers are connected via serial line and behave like modems.
>> There is no driver for them, i.e. no OS support.
The serial driver section of the kernel handles that.
>High-level programs might not list the slower rates as being supported
>though for their own reasons (I notice minicom only lists down to 300
>baud), but I expect the Linux libraries and the hardware itself can
>support it fine.
Legitimate speeds for 'pppd' are defined in pppd/sys-linux.c in the
ppp source, and this runs
50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2000, 2400, 3600, 4800,
7200, 9600, 19200, 38400, 57600, 115200, 230400 and 460800 bits per sec.
Whether the peer at the other end of the telephone line can remember how
to speak that slowly is probably more important. Note also that these are
the serial port speeds, not necessarily the speed over the wire (which is
why 14,400 is missing).
Old guy
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