It probably doesn't look like a workstation to you, but that is a late 90's Sun workstation
Basically an Ultra 80 with a stand. It would have one built in NIC, and probably an addon quad NIC if it was ordered that way. I believe the addon ports would come up as qfe0, qfe1, etc.. you can try plumbing qfe0, qfe1, etc and see if one plumbs...
Now that I think about it, I'd say it would be better to first try the network connection the E150 is using in another box. Just take a laptop, hardcode it with the IP info from the E150, have the network guys reserve the IP to the laptop's MAC (if that's what they are using to reserve the IP) then remove the cable from the E150's hme0 right and plug it right into the laptop. That will tell you if the network connection works or not.
If it works, then you know is something in the server.