This HDMI 1.3a cable supports deep color and has a mini signal repeater to allow the cable to be run up to 82-feet behind walls. Useful, if it works (it's not powered). As we proved in our HDMI tests, like all DC current over straight wire, even digital video signals degrade over great distance. [Accell]
@ultim8fury: yep, HDMI (and DVI) has a low voltage power supply on the output port. For example, I have a fiberoptic HDMI cable from Gefen. Plug it into an HDMI port and you get a nice glow from the red LED on the cable's head.
All the HDMI cables with repeaters use this low voltage power source.