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ISDN modems



>>>>> Jacques Goldberg writes:

  Jacques> Does somebody know if the Teles.16/PP or the Teles.16/PnP
  Jacques> would work on my Linux box (RH 4.2, kernel 2.0.30 ,
  Jacques> upgrading ruled out for serious application-specific
  Jacques> reasons) ?

The short answer: Yes, this will work.

The longer answer: There are apparently three different Teles cards
with very similar names -- the 16.3, the 16.3 PnP, and the 16.3c PnP.
All can work with the latest version of the "HiSax" driver, which you
can get from ftp://ftp.suse.com/pub/isdn4linux/v2.0/.  You will have
to grab the latest tarfile, which includes the source for some modules
that fail to compile.  Ignore or comment those out.

You might well need kernel 2.0.32.  I started with the Red Hat 5.0
kernel (2.0.31), upgraded to 2.0.32, and then compiled the latest
version of the HiSax module.

If you are using the 16.3 PnP or 16.3c (which is what Internet Zahav
installs if you order their package), you will need to use the isapnp
package to deal with the plug-and-play issues.  You will then need to
use insmod or modprobe in order to load the module into the system.

Note that the 16.3 PnP requires two memory locations (io0 and io1),
while the 16.3c PnP requires only one (io)!  Specifying the memory
locations incorrectly will result in the driver not loading.

You can use the ISDN card in IDSN mode, which requires additional
fiddling and the use of "isdnctrl" and other utilities.  I decided to
take the easy way out and use the modem emulation provided by the
isdn4linux system.  Minicom, pppd, and diald worked just fine; I
simply had to point them to /dev/ttyI0 rather than /dev/cua0 or
/dev/modem.

Using the modem emulation, I got extremely good performance (just
under 6.0 KB/sec on an ftp from the States) using the 16.3c over
Internet Zahav.  The only problems I encountered were occasional
hangups from the side of Internet Zahav, perhaps tickled because I
didn't specify -bsdcomp.  When I play with the configuration again on
Sunday, I'll try to add this option, and we'll see what happened.  It
also seems that Internet Zahav took between four and five minutes to
allow us to log in again once we were disconnected in this manner.

There is lots of documentation for ISDN under Linux, but it's (a) not
very practical, (b) poorly written, (c) hard to find, or (d) written
in German.  I hope to write something basic once everything is stable
on the connection I set up.

I hope that this helps!

Reuven