My experience is that a T-1 line is at the very low-end of acceptable
communication speed for an Access multiuser database. I have been able to
tell the difference between old 4MPBS networks and 10MBPS networks on the
same database.

Yes, Access is very sensitive to network difficulties. It's not so much that
Access "finds" the problem; it's that Access just doesn't work when there is
such a problem.

I'd say you need to visit MVP Tony Toews' site, http://www.granite.ab.ca,
because he has about the most extensive collection of information and links
on multiuser performance and corruption-avoidance that I have found. You
might find a few different links and items at Jeff Conrad's site,
http://home.bendbroadband.com/conradsystems/accessjunkie.html

 Larry Linson
 Microsoft Access MVP