B&B Electronics 00-00085 - Manual - Manual (Page 8)

USB Rover 1650/2650
4
USB Cables
USB cables have two distinct connectors. The Type A connector is used to
connect the cable from a USB device to the Type A port on a computer or
hub. The Type B connector is used to attach the USB cable to a USB device.
USB Type A
port
USB Type A
connector
USB Type B
port
USB Type B
connector
Power Handling
Some USB devices are powered directly from the USB and do not require
individual power supplies. These devices are called bus-powered devices.
The USB Rover can provide power to these devices so they can be operated
remotely.
Bus-powered devices are further divided into low-power and high-power
categories. Low-power devices are allowed to draw up to 100 mA from the
USB. Typical examples include mice, joysticks, and keyboards without
hubs. High-power devices are allowed to draw up to 500 mA from the USB.
Typical examples include cameras and keyboards with hubs. To determine if
a device is high-power or low-power, consult the user documentation for the
device.
The USB Rover can supply sufficient power to support all low-power
devices and most high-power devices. Devices that place a very heavy power
drain on USB (>300 mA) are not supported. Most USB devices operate well
within this power budget.
NOTE : Devices with their own power source are usually considered to be
low-power devices from a USB perspective and are thereby
compatible with the USB Rover.
Compatibility
The USB Rover complies with USB 1.1 specifications governing the design
of full-speed and low-speed USB devices. However, Icron Technologies
Corporation does not guarantee that all USB 1.1 devices are compatible with
the USB Rover.