Universal Serial Bus

universal serial bus

[‚yü·nə‚vər·səl ‚sir·ē·əl ′bəs] (computer science) A serial interface that can transfer data at up to 480 million bits per second and connect up to 127 daisy-chained peripheral devices. Abbreviated USB.

Universal Serial Bus

(hardware, standard)(USB) An external peripheral interfacestandard for communication between a computer and externalperipherals over an inexpensive cable using biserialtransmission.

USB is intended to replace existing serial ports, parallel ports, keyboard, and monitor connectors and be used withkeyboards, mice, monitors, printers, and possibly somelow-speed scanners and removable hard drives. For fasterdevices existing IDE, SCSI, or emerging FC-AL orFireWire interfaces can be used.

USB works at 12 Mbps with specific consideration for low costperipherals. It supports up to 127 devices and bothisochronous and asynchronous data transfers. Cables canbe up to five metres long and it includes built-in powerdistribution for low power devices. It supports daisy chaining through a tiered star multidrop topology. A USBcable has a rectangular "Type A" plug at the computer end anda square "Type B" plug at the peripheral end.

Before March 1996 Intel started to integrate the necessarylogic into PC chip sets and encourage other manufacturersto do likewise. It was widely available by 1997. Laterversions of Windows 95 included support for it. It wasstandard on Macintosh computers in 1999.

The USB 2.0 specification was released in 2000 to allow USB tocompete with Firewire etc. USB 2.0 is backward compatiblewith USB 1.1 but works at 480 Mbps.

usb.org.

单词	universal serial bus
释义	Universal Serial Bus universal serial bus [‚yü·nə‚vər·səl ‚sir·ē·əl ′bəs] (computer science) A serial interface that can transfer data at up to 480 million bits per second and connect up to 127 daisy-chained peripheral devices. Abbreviated USB. Universal Serial Bus (hardware, standard)(USB) An external peripheral interfacestandard for communication between a computer and externalperipherals over an inexpensive cable using biserialtransmission. USB is intended to replace existing serial ports, parallel ports, keyboard, and monitor connectors and be used withkeyboards, mice, monitors, printers, and possibly somelow-speed scanners and removable hard drives. For fasterdevices existing IDE, SCSI, or emerging FC-AL orFireWire interfaces can be used. USB works at 12 Mbps with specific consideration for low costperipherals. It supports up to 127 devices and bothisochronous and asynchronous data transfers. Cables canbe up to five metres long and it includes built-in powerdistribution for low power devices. It supports daisy chaining through a tiered star multidrop topology. A USBcable has a rectangular "Type A" plug at the computer end anda square "Type B" plug at the peripheral end. Before March 1996 Intel started to integrate the necessarylogic into PC chip sets and encourage other manufacturersto do likewise. It was widely available by 1997. Laterversions of Windows 95 included support for it. It wasstandard on Macintosh computers in 1999. The USB 2.0 specification was released in 2000 to allow USB tocompete with Firewire etc. USB 2.0 is backward compatiblewith USB 1.1 but works at 480 Mbps. usb.org. AcronymsSeeUSB
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