Plug DigiView into a POWERED HUB (one with its own power supply) or directly into a USB port on your PC. You can not use a bus-powered hub; it does not have enough power to operate DigiView.
Powered by an external power supply, so USB power is of no concern.
You will experience better performance on a 2.0 port, but a 1.1 port is sufficient.
Preferably, use a high-speed USB port located directly on the motherboard at the rear of the computer or a port anywhere on the computer case that utilizes a high quality cable internally. If you use a different USB cable than the one provided with the unit, it should match the full rated speed of the USB connection to prevent communication errors or loss of data.