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USB 1.x
USB 1.0 specified data rates of 1.5 Mbit/s and 12 Mbit/s. Also It did not allow for extension cables or pass-through monitors, due to timing and power limitations. -
USB 1.1
fixing problems identified in 1.0, mostly related to using hubs. -
USB 2.0
Adds higher maximum signaling rate of 480 Mbit/s. In addition to the "USB 1.x Full Speed" signaling rate of 12 Mbit/s -
USB 3.0
The standard defines a new SuperSpeed mode with a signaling speed of 5 Gbit/s and a usable data rate of up to 4 Gbit/s. -
USB 3.1
USB group revealed plans to update USB 3.0 to 10 Gbit/s