I am mounting a wall socket for my cat 5-cable. This socket has two "holes", but only one will be used to connect the cable. I was thinking I could place an activity LED in the other hole. How would the schematics look for an activity LED on a network cable? I am guessing I would need some sort of small battery to drive the LED, or is there a current that I could use from the cat5-cable itself? If so, will this affect the speed of my connection?