Avaya VSU's

Just a little more background info. We have an Avaya VSU 2000 (we were
running a 10000 but decided to try a 2000) at the main office. All of our
remote sites have Avaya 5x or SG5  VSU's. All machines in the remote sites
are constantly on our network. So it really isn't "one" application. For an
example, one of our sites has Cox Cable. The account is for 6MB down and
1MB up. Doing some speed tests show some machines in the 1.5MB down  and
500kb up range. While others are clear down to 200kb down and 500kb up.
Sometimes I wonder if it isn't the NIC on certain machines or maybe the
switches they are plugged into. Thanks to all of you who are throwing
suggestions out there. I really do appreciate it.

Thanks,

Chad Heskett
IT Infrastructure Support