Rogers - usenet poster
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USB specification says 15 feet; however, on most cameras I have been able to go 20 feet with a USB extension cord. Some cameras won't work that far away. I have also been able to extend some cameras as much as 35 feet by placing a self-powered USB hub at the 20 foot point from the camera. This doesn't always work so don't be disappointed if it doesn't work for you.
Helpful hint: Plug the hub into the computer first and wait for the computer (Windows) to recognize and configure the hub before plugging in the camera.