On March 29, 2012 at 15:12, Greg C said...
Also, the Y & C should be on the same pair, not split. That will give you another pair for power.
This right here is the biggest failure I see all the time. As Greg says, you cannot double up the Y & C conductors, same with AMX. Have you ever heard of gremlins in your system? I have gone into systems other people have installed and fixed problems simply by removing the doubled up comm pairs.