Possible to upload a higher resolution pic? I'm having trouble reading the numbers I would usually google.
My familiarity with LCs is limited, but that looks like a card that plugs into the PDS slot and has two types of Ethernet connectors - RJ-45 (modern standard) and a BNC/10Base2 connector (obsolete, looks like a cable TV plug).
Farallon made a lot of these cards, not sure if this is a Farallon, but you could try Farallon drivers - I'm pretty sure they are widely available online, I don't have the link handy. Asante is another common Ethernet card provider with widely available drivers.