TAILIEUCHUNG - USB Complete fourth- P50

USB Complete fourth- P50:This book focuses on Windows programming for PCs, but other computers and operating systems also have USB support, including Linux and Apple Computer’s Macintosh. Some real-time kernels also support USB. | Chapter 19 peripheral contains a wireless bridge to convert between the wireless interface and the peripheral s circuits. Certified Wireless USB The USB-IF s Wireless Universal Serial Bus Specification defines Certified Wireless USB. Revision was released in 2005. Certified Wireless USB supports speeds of up to 480 Mbps at 3 m and 100 Mbps at 10 m. The interface supports power-saving modes and uses encryption for security. The technology is ultrawideband UWB radio which transmits in short bursts at very low power over a wide frequency spectrum. The UWB technology is defined in the ISO IEC 26907 8 specifications which evolved from specifications developed by the nonprofit WiMedia Alliance. A USB host can have a built-in Wireless USB interface or a wired connection to a USB device that functions as a host wire adapter HWA that communicates via Wireless USB. In a similar way a USB device can have a built-in Wireless USB interface or a wired connection to a device wire adapter DWA that communicates via Wireless USB. Products with Certified Wireless USB interfaces have been slow to reach the market. Development kits have been expensive making the interface impractical for many developers. However notebook PCs with built-in Wireless USB interfaces are available and in time development tools will likely become more affordable. Cypress WirelessUSB For low-speed devices including HIDs Cypress Semiconductor offers the WirelessUSB technology. The obvious market is wireless keyboards mice and game controllers. With a wireless range of up to 50 m the technology is also useful for building and home automation and industrial control. The wireless interface uses radio-frequency RF transmissions at GHz in the unlicensed Industrial Scientific and Medical ISM band. A WirelessUSB system consists of a WirelessUSB bridge and one or more WirelessUSB devices Figure 19-11 . The bridge translates between USB and the wireless protocol and medium. The WirelessUSB device carries out .

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