As far as what you need to stop switching that cat 5 cable it is just a simple network switching box/hub.

http://www.bestbuy.com/site/Wired-Networking/Hubs-Switches/abcat0503012.c?id=abcat0503012

I have one for my HT requirements as well, much simpler than running a bunch of cat5 to one location that rarely requires a bunch of bandwidth.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70