to find out could be the high-speed, full speed or low speed devices

Although USB device is widely used, more generally, USB2.0 interface, its transmission speed of 480Mbps. Needs of users, may be the power to enhance technological development, the designers also observe that this bottleneck. At the moment, COMPAQ, H . p ., Intel, the Lucent, Microsoft, the NEC and PHILIPS 7 vendors have jointly developed a standard USB 2.0 interface. USB 2.0 data transfer speeds between devices increased to 480Mbps, 40 times faster than USB 1.1 standard, the pace enhances the maximum benefit for users signifies that users can be more effective make use of another device, is actually a variety of speed peripherals may be coupled to the USB 2.0 line, and without worrying about the data transmission bottleneck effect.
So, the use of a USB 2.0 scanner is totally different, sweeping a 4M picture just 0.1 seconds, the blink of the eye later, the efficiency is greatly improved. Moreover, USB2.0 will use a similar specifications since the concise explaination the initial USB cable, connector specifications are similar, the same and keep the premise of high-speed USB 1.1, outstanding characteristics, and, USB 2.0 devices usually do not and USB 1.X equipment in accordance use within the big event of any conflict. USB2.0 suitable for USB1.1, that is certainly USB1.1 device and USB2.0 Device Universal, in case USB2.0 devices can only act on full speed (12Mbit / s). USB2.0 high-speed, full-speed and low speed three sorts of speed, high-speed 480Mbit / s at full speed is 12Mbit / s, low speed is 1.5Mbit / s. Which at full speed and low speed works with USB1.1 and USB1.0, optional USB products cannot just pay attention to the organization advocacy USB 2.0, and also to find out could be the high-speed, full speed or low speed devices.
The USB bus is often a one-way bus master controller over a PC, USB devices can't initiate communication with PC. To solve the issue with the mutual communication of USB devices, the designers developed the USB OTG standard allows embedded systems to communicate jointly by way of a USB interface, and thus eliminate the PC. Rename the modern USB Flash Drive specification USB standard original USB 1.1 right USB 2.0 Full Speed (full-speed version), the first USB 2.0 in to a USB 2.0High-Speed (high-speed version), and also announced a fresh logo. It's understandable that high-speed USB 2.0 speed naturally, exceed the entire-speed version of USB 2.0.