USB 1.1The Universal Serial Bus is the most widely deployed PC peripheral interface in history, enabling simple plug and play connectivity for a wide variety of devices to enhance the computing experience. Developed to improve ease of use and provide flexible port expansion, the USB bus has become an indispensable computing technology. USB 1.1 provides support for two interface speeds: Low Speed at 1.5Mb/s and Full Speed at 12Mb/s. The two interface speeds target specific classes of devices to provide the most efficient and cost-effective interconnect solution. Low speed devices are typically interactive input devices such as keyboards, mice or game controllers. Full speed devices are typically application specific input devices such as microphones, cameras and printers.? Despite the introduction of USB 2.0 and 3.0, USB 1.1 is still a very viable and usable option, depending on your application and speed requirements.
　　USB 2.0The Universal Serial Bus is the most widely deployed PC peripheral interface in history, enabling simple plug and play connectivity for a wide variety of devices to enhance the computing experience. As PC’s and peripheral devices have added more processing bandwidth, performance and features, the USB 2.0 standard was developed to offer a complimentary high-speed transfer rate at 480Mb/s. Backwards compatible with the full speed and low speed transfer rates of USB 1.1, USB 2.0 delivers a significant bandwidth increase while maintaining the value added features that motivated the original USB development.
　　Super Speed USB 3.0As technology innovation marches forward, new kinds of devices, media formats, and large inexpensive storage are converging. They require significantly more bus bandwidth to maintain the interactive experience users have come to expect. In addition, user applications demand a higher performance connection between the PC and these increasingly sophisticated peripherals. USB 3.0 addresses this need by adding an even higher transfer rate to match these new usage and devices.
　　USB continues to be the answer to conncectivity for PC, Consumer Electronics, and Mobile architectures, It is a fast, bidirectional, low-cost, dynamically attachable interface that is consistent with the requirements of the PC platforms of today and tomorrow.
　　SuperSpeed USB brings significant performance enhancements to the ubiquitous USB standard, while remaining compatible with the billions of USB enabled devices currently deployed in the market. SuperSpeed USB will deliver 10x the data transfer rate of Hi-Speed USB, as well as improved power efficiency.
　　SuperSpeed USB has a 5 Gbps signaling rate offering 10x performance increase over Hi-Speed USB.
　SuperSpeed USB is a Sync-N-Go technology that minimizes user wait-time.
　　SuperSpeed USB will provide Optimized Power Efficiency.No device polling and lower active and idle power requirements.
　SuperSpeed USB is backwards compatible with USB 2.0. Devices interoperate with USB 2.0 platforms. Hosts support USB 2.0 legacy devices.
　　The USB 3.0 SuperSpeed specification has been ratified. The SuperSpeed specification provides the technical details to understand USB 3.0 requirements and design USB 3.0 compatible products and is available for download from the official USB website at www.usb.org/developers/docs/.
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