What is the difference between self-powered and bus-powered USB hubs?
• A self-powered hub plugs into an electrical outlet so that it is better able to provide connected devices with power. Only low power USB devices can be connected to a bus-powered hub (like mice and keyboards). A self-powered hub will allow you to safely connect other devices that require up to the full 500mA outlined in the USB specification. D-Link offers self-powered and user-selectable self- or bus-powered hubs.