Generally, USB cables are divided into two different bandwidth groups :1.1, with a maximum data transfer rate of 1.5 Mbit/s, and 2.0, with a data transfer rate of 480 Mbit/s.USB 2.0 backward compatible with 1.1 lower data transmission requirements, but not reverse replacement;1.1 simply cannot provide the data transfer rate required by USB 2.0 level devices.
In addition to the bandwidth categories listed above, USB devices can also be tagged in the following "Speed" category, which specifies the amount of bandwidth they need to operate:
Low Speed: The “ low speed” rating indicates that a device requires minimal bandwidth (1.5 Mbit/s) to function, so it can be used in conjunction with either 1.1 or 2.0 USB cables. Joysticks, keyboards and computer mice are a few common examples of low speed devices.
Full speed: A device labeled "Full speed" requires a signal rate of 12 megabits per second.Because this is such a common bandwidth requirement, all USB hubs on the market are designed to support full speed.Although the data transfer speed is higher, it is just as good over a 1.1 or 2.0 USB cable as at lower speeds.
High Speed: “ High speed” USB devices run at 480 Mbit per second, and require a 2.0-rated USB cable.