The AverTV is a PC TV tuner that comes with two USB cables. It seems it requires more than the ~500ma available from one USB port, as noted in a review in the Inquirer:
"The USB cable has one end which plugs into the little box, and at the other end two USB connectors. Why two? The manual explains that the box might require more power and if so, you need to plug in both connectors. When we tested this on our notebook, we discovered that's exactly what we needed to do to fire up the system."
So USB is not a limit to the power requirements of portable equipment - just add more connectors!
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Maybe there will be a new version of the USB spec that allows higher power levels, similar to power over ethernet. POE, I believe, supports up to 15 W, and both devices need to negotiate before the host sends power to the client. Are there details about USB (in the physical cabling or otherwise) that would preclude this?
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