isdn4linux and fax

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Hi,

Sven Liessem wrote:
> Gert wrote :
> 
> > If you have a card that has no DSP (which is the normal case for cheap
> > ISDN cards), you have to do all this on the host CPU. In real-time.
> 
> Well that's the same as buying cheap modems. It was not my intention to
> buy a passive card but an active one.

An active card may not have a DSP chip *either*. It just has a processor
that knows ISDN protocols.

There are passive cards out there (I think Elsa has one) that *do* have a
Fax/Modem DSP. I don't know how well it is supported under Linux,
though.

> > The USR I-Modem works fine, but it's actually a "normal" modem (you don't
> > access it via ttyIxx either, it has a standard ttyS* serial port).
> 
> Fine. So I suppose you do **not** need isdn4linux to use the USR and all
> the nice futures (channel B coupling...) are set up by AT commands.

Yes.

> Has someone tried this card successfully for isdn and "analog" fax and
> data connections ?

Yes. Well, I didn't use the card (it won't fit in the AIX RS/6000 box,
especially not 5 of them :) ) but external ones. AFAIK, the externals are
the same hard- and software, the internal has just an additional serial
port UART glued directly on the board...

> > For things like TELES or Fritz! boards, there is no DSP on the card, and
> > thus, no class 1/class 2/whatever support.
> Well at least this is clear, get your hands off from this boards if you
> want more than just basic isdn operations.

Yup.

> BTW I also took a look at Eicon Diva Pro and Bewan Gazel Pro cards but
> the specs on the websites are poor and I had no time yet to call.
> Again if someone has tried this card please drop me a note about it.

No idea.

gert

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Gert Doering - Munich, Germany      gert@greenie.muc.de
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