"how exactly is it connected?"
There's a router between the modem and computer. So, I connected the T400
directly to the modem, and the connection speed was optimal, which was to be
expected. The fact is I cannot have the T400 directly connected to the modem
(due to my network setup). The internet speed of my other computer, which is
connected to the router, is fine (not as fast as when directly connected to
the modem, but that's normal). The same occurs when a friend connects their
computer in the same way.
Why is the T400's internet speed, when connected to the router, so slow?
There has to be an explanation.