Re: ISDN-Question

[Jonathan Thornburg <jthorn@aei.mpg.de>]

In message <http://monkey.org/openbsd/archive/misc/0403/msg00021.html>
"Rembrandt" <rembrandt@jpberlin.de> asked about ISDN support in OpenBSD.

When I investigated this a few months ago (message
<http://monkey.org/openbsd/archive/misc/0311/msg00122.html> and replies),
I found that my best bet was an external ISDN terminal adapter ("TA",
often misdescribed as a "modem") which talked a modem-style AT command
set to my OpenBSD box via a serial port.  Note that with this setup,
OpenBSD sees the ISDN TA as a fast "modem", and uses the userland ppp(8)
(or alternatively the kernel pppd(8) if you prefer) to put a network
connection on top of it, so there's no specific ISDN support needed on
the OpenBSD side.

I have this setup working fine now.  My ISDN TA is a Zyxel Omni TA-128
which I bought for 30 or 40 Euros on E-bay.  With a serial port speed
of 115200 baud, I get typical speeds for scp-ing files or downloading
web pages of around 10K bytes/second; so far I've put no effort into
optimizing the many settings (both in ppp(8) and the ISDN TA) which
might improve this.

ciao,

-- 
-- Jonathan Thornburg <jthorn@aei.mpg.de>      
   Max-Planck-Institut fuer Gravitationsphysik (Albert-Einstein-Institut),
   Golm, Germany, "Old Europe"     http://www.aei.mpg.de/~jthorn/home.html      
   "Washing one's hands of the conflict between the powerful and the
    powerless means to side with the powerful, not to be neutral."
                                      -- quote by Freire / poster by Oxfam