Check your system log
PCMCIA Serial and Modem Issues
Quatech quad serial card (Jeff)
Date: 1999, Dec 09
From: David Hinds <firstname.lastname@example.org>
Did you get two high beeps when you inserted the card?
What got reported in your system log?
How about /var/run/stab (or /var/lib/pcmcia/stab)?
to: "Check your system log"