Longest CAT5 4 pair 24 AWG UTP run that I saw in use on a 100baseT Ethernet LAN - and had no packet errors, etc. (at least for the time period I was there), was around 2,400 Ft. from Switch / MDF, to the Station.

Saw an even longer one on a LON (Local Operational Network - as in Building Automation Control Systems), which was used for Programming the MBC from a "More Convenient Location".
This was a good 3,000 Ft. - or more!

Here's a point to ponder:

Ever seen a CAT5 or CAT5e cable spliced - using normal Wirenuts (little Blues or Little Grays), and there is no data loss situation?

Seen it at 3 different locations.

Who'da thunk it?! [Linked Image]

Scott35

Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!