I just wired my house with cat 6 cable, the cables going to each room are connected to a network switch which is then connected to a cable modem. I connected one of the cat 6 lines in my living room to an Apple Airport Extreme. I then connected a Sonos bridge on cat 5e and my tv on cat 6 to the Airport. Yet every time I connect the tv over cat 6 my whole network goes down. Does anyone know why this is the case? Any help would be appreciated.

The router is in the living room, connected to one of the cat 6 lines. I tried a cat 6 patch cable to connect from the Airport to the tv and it worked without taking the network down.

Most devices these days can switch a port from requiring a patch cable to using a regular one, but not all do that. Apparently that was your problem.