It would be helpful if you could give us some more information about your pcmcia card. I know that there used to be problems with the xircom combo cards but im not sure if these are still vaild. When i tried to use one (about 8 months ago) i had loads of random problems with the card working with some commands and apps but not others and often only just after a reboot.
The PCMCIA hardware list at:
Lists the following xurcom cards as unsupported:
Xircom CEM II Ethernet/Modem
Xircom CE-10BT Ethernet [ but try xircce_cs contrib driver ]
Xircom CBE-10/100 CardBus
Have a look theres loads of information there.