Your modem connection should be established automatically. Type
plog to check the login sequence with your ISP. If
there is no output check /var/log/syslog to get a
clue on potential problems.
If you want to be sure that your modem and/or script parameters
are OK before backing up ppp.lrp and/or pcmcia.lrp, you can activate the
pcmcia connection manually by typing launch the connection manually just
by typing /etc/init.d/pcmcia start. Use
/etc/init.d/pcmcia stop to stop the pcmcia
connection, remove the modules and bring down eth0 and ppp0.