Re: [opensuse] USB Modem, wvdial not redialing

Carlos E. R. wrote:
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The Friday 2008-02-01 at 20:51 -0500, Aaron Kulkis wrote:

I have, in the past, had problems several times with modems that required
special software to work, and in all cases they were internal modems.

Those aren't actually modems...they're primitive sound cards
combined with software which emulates a real modem. A real
modem being defined as one which does the job with nothing
more than analog circuits, A/D + D/A converters, and the
only digital logic circuits being the the 4 registers (input,
output, control, and status) plus associated "glue logic"

Not always.

Sometimes they are modems, but the error detection/correction logic is done by the driver and main cpu, instead of some kind of cpu in the modem.


A true modem doesn't have an on-board CPU.
Not even 56k modems using frequency, amplitude, and phase shifting.
There are hybrid digital/analog ICs (integrated circuits) which dothis right from the factory, needing only connectivity to power,
a few external discreet elements (resistors, capacitors and/or
crystals.

They're generally more expensive than the DSP (Digital Signal
Processor) + A/D + D/A solution, BUT they have the advantage
of not needing any "driver" software, and so will be useable
50 years from now, as long as you can hook up to a serial port,
or rig up the pin-outs to whatever a serial port will look like
when that time comes.


Any "modem" with a DSP chip on it is NOT a real modem.

I wouldn't go as far as that.


I would try minicom. But I trust that if wvdial can not use it, there are
serious problems. That's a very good program, I use it with preference to
kinternet and such to really know what is happening with the connection.

The reason I suggest catting to it directly is that the
capabilities of the modem can be tested directly.

My guess is that he probably didn't specify the correct /dev file.

Improbable.

Wvdial connects the first time, and fails on the second one.

- -- Cheers,
Carlos E. R.
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