An ExpressCard slot is a standardized slot built into laptops to support additional connectivity to the laptop through the insertion of an ExpressCard NIC. The ExpressCard standard replaced the PC Card (PCMCIA) standard and specifies two form factors: a 34mm wide ExpressCard/34 and a 54mm wide ExpressCard 54, which also supports 34mm ExpressCards. Like all network adapters, these ExpressCard NICs utilize drivers supporting the operating system in use on the PC.
Transition Networks’ ExpressCard network adapters were a simple solution for providing fiber connectivity to laptops with ExpressCard expansion slots for use in high security or fiber-rich networks. The ExpressCard NICs supported Fast Ethernet or Gigabit Ethernet network speeds to provide the right solution for any network.
These cards have now been discontinued, including the NEC-GXE-LC-01 card
We recommend that you take a look at the Transition Scorpion USB Fibre Interfaces as an alternative.