Step 6My Experiences
I am using this to run a network cable and audio to my PS3 and sound system from my computer station(computer I listen to music on, and my router). I have no problems. My room has tons of Electromagnetic waves going around it, with Bluetooth, Wireless Network, and all other forms of EMI floating thorught the air, however I have little or no distortion in sound or video, when both video and audio are running. Now I wouldn't recommend running this cable more than 70 feet without an audio amplifier built in(which is possible to put it in a project box and run off a 9V or a wall outlet).
My instance is just one of many where the extra 4 cables have been used to carry other signals. Two other uses that I know of are Voice/Data, with 2 pair being network data, and 1 or 2 being phone lines, and the Power Over Ethernet, where in the extra 2 pairs 5 and 12 positive and negative are run.
For my suggestions of expansion refer to the bottom of step 4.
Unfortunately it didn't work for TV but OK for data transmission. Any known reason or ideas please??