I have a UBS-video capture device connected to a computer with a 5 m USB-cable and a powered USB-hub at the end where the device is plugged in. The problem is I get a lot of glitches and freeze even though the output from the usb-hub is 5 V. When I try a shorter cable (2 m) it works fine. But what could be the problem when I know the power output to the device is enough? Is it the signal going back to the computer that is the problem? Does it need extra power that way too? I could try with another usb-hub and three 2 m cables and see if that works but I don't understand why it isn't working allready with one hub?
Current: (PC)<---(5 m USB A/B)--->(USB HUB w/ power)<---(2 m USB A/A)<---(Device)-->(TV)
Other option: (PC)<---(2 m USB)--->(HUB)<---(2 m USB)-->(HUB)<---(2 m USB)<---(Device)-->(TV)