Just curious if theres dangerous voltage (not to humans, but to elecronics) on a DirecTV swm port. For example, say you have a green labeled 8 way feeding 8 rooms, and a cable splitter feeding a few rooms. In a room with both feeds, if you accidently connect the coax jack from the DirecTV to a tuner, would it blow the tuner out? Or is just the first, red port the only port able to pass voltage. I know I could break out the multimeter and measure myself, but I don't have that out right now.