Mind some of the comments on that page; depending on your OS version, you may need to install other software on the 5300 to make it happy.
And just for the pedants, yes, neither the 1400 nor the 5300 has Cardbus; this is just a regular PCMCIA Enet card.
And just for the pedants, yes, neither the 1400 nor the 5300 has Cardbus; this is just a regular PCMCIA Enet card.