OK, this page is supposed to guide you through getting PPP to work with the
3ComImpact IQ ISDN modem on Linux.  It may or may not be accurate, since I
wrote it quite a while after doing the install.  It represents the steps I
took to get things working with my particular ISP, and may or may not have
everything you need.  When I was trying to get things rolling, I found even
imperfect info helpful, so I post what I did here . . .<p>

I highly recommend "The Linux Network" from the M&T books Slackware series.
It's what I first read to figure out PPP (I shamelesslly used SLIP long after
it was passe, finally upgrading when I got an ISDN modem).  I wasn't running
slackware at the time, but it is a great intro to networking related stuff:
gives you the basic facts, without treating you like an idiot . . .<p>

<ol>
<li> Initialize your ISDN modem using Windoze as described by manual<p>
<li> Make sure you have PPP compiled into your kernel.  Way I usually check
is to 
<pre>
   dmesg | fgrep -i ppp
</pre>
and if you don't see something like:
<pre>
PPP: version 2.3.7 (demand dialling)
PPP line discipline registered.
registered device ppp0
</pre>
You'll need to recompile your kernel and add PPP support.<p>

<li> Create the file <bf>/usr/sbin/PPP-on</bf>:<br>
<pre>
#!/bin/sh
exec /usr/sbin/pppd /dev/ttyS1 115200
</pre>
Where you replace ttyS1 with your serial port number.  Linux is one less than
what it is under dos.  So if you are connecting the modem to Windoze's COM1,
this is /dev/ttyS0.<p>

<li> Create the file <bf>/usr/sbin/PPP-off</bf>:<br>
<pre>
#!/bin/sh
DEVICE=ppp0
#
# If the ppp0 pid file is present then the program is running. Stop it.
if [ -r /var/run/$DEVICE.pid ]; then
        kill -INT `head -1 /var/run/$DEVICE.pid`
#
# If the kill did not work then there is no process running for this
# pid. It may also mean that the lock file will be left. You may wish
# to delete the lock file at the same time.
        if [ ! "$?" = "0" ]; then
                rm -f /var/run/$DEVICE.pid
                echo "ERROR: Removed stale pid file"
                exit 1
        fi
#
# Success. Let pppd clean up its own junk.
        echo "PPP link to $DEVICE terminated."
        exit 0
fi
#
# The PPP process is not running for ppp0
echo "ERROR: PPP link is not active on $DEVICE"
exit 1
</pre><p>

<li> Create the file <bf>/etc/ppp/options</bf>:<br>
<pre>
connect "/usr/sbin/chat -f /etc/ppp/chat3"
modem
lock
crtscts
defaultroute
user _YOUR USER NAME_
noipdefault
</pre><p>

<li> Create the file <bf>/etc/ppp/chat3</bf>:<br>
<pre>
ABORT BUSY
ABORT "NO CARRIER"
ABORT VOICE
ABORT "NO DIALTONE"
ABORT "NO ANSWER"
"" ATZ
OK ATS80=1
OK ATDT _YOUR ISP PHONE NUMBER_
CONNECT \d\c
</pre><p>

<li> Create the file <bf>/etc/ppp/pap-secrets</bf>:<br>
<pre>
# Secrets for authentication using PAP
# client        server  secret                  IP addresses
"_YOUR ISP LOGIN NAME_"    *      "_YOUR ISP PASSWORD_"
</pre><p>
</ol><p>

If a miracle occurs, you should now be able to log in as root, and type
<bf>PPP-on</bf> to establish your PPP connection, and <bf>PPP-off</bf> to
kill it.  After PPP-on, scope <bf>/var/log/messages</bf> for info on the
connection.  Also, <bf>/etc/ppp/connect-errors</bf> has info in the event
of login problems.<p>

<hr>
<center>
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</center>