We added a new building to our facility and ran a cat5e cable underground to it (E to F). Not sure the distance, but I'm sure it's greater than 300 ft (maybe 450?).
A = Modem in Server Closet
B = Router in Server Closet
C = Switch in Server Closet (not on-site now, but I think it's a netgear prosafe PoE switch)
D = Switch in Parts Room (about 100ft from C)
E = Wall Panel in Machine Shop (about 100ft from D)
F = New External Building (maybe 350-450 ft from E)
Buildings were erected in unplanned phases, so we ran a wire from D to E to F.
If I plug in my laptop at E, it works
If i plug in a switch at E, and connect laptop to switch, it works
If I put a couple at E to connect F, and then plug only one computer at F, it works
When I move the switch to F (and use a coupler or another switch at E) , it doesn't work
When I move laptop to F (without switch at F), it doesn't work
BUT any single Desktop PC at F will work, and works perfectly
Problem is that I have 4 computers at F that need to be connected.
Why would a single desktop work, but not a laptop or switch?
Also, I changed the switch, but same result
When plugging in switch at E, still one computer will work, but not through a second switch at F. If I keep the switches at E and F, and plug one computer into F switch, it keeps trying to connect, and even says internet access, but it won't ping anything on the LAN and event viewer shows a warning for DNS timeout.
Is it possible that the Desktops have enough power to send the signal back up that far (if switch isn't in the way), whereas the switch and laptop don't?
When a single desktop computer is plugged straight in at F, I get about 40ms ping to Google, and internet seems fine.
So why would a single desktop work, but not multiple desktops through a switch.
Computers are Win 7 pro and switches are normal d-link and tplink (i think) 8 port desktop switches.