Universal Serial Bus

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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 interface standard for communication between a computer and external peripherals over an inexpensive cable using biserial transmission.

USB is intended to replace existing serial ports, parallel ports, keyboard, and monitor connectors and be used with keyboards, mice, monitors, printers, and possibly some low-speed scanners and removable hard drives. For faster devices existing IDE, SCSI, or emerging FC-AL or FireWire interfaces can be used.

USB works at 12 Mbps with specific consideration for low cost peripherals. It supports up to 127 devices and both isochronous and asynchronous data transfers. Cables can be up to five metres long and it includes built-in power distribution for low power devices. It supports daisy chaining through a tiered star multidrop topology. A USB cable has a rectangular "Type A" plug at the computer end and a square "Type B" plug at the peripheral end.

Before March 1996 Intel started to integrate the necessary logic into PC chip sets and encourage other manufacturers to do likewise. It was widely available by 1997. Later versions of Windows 95 included support for it. It was standard on Macintosh computers in 1999.

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

References in periodicals archive ?
In the USB 1.0 and 2.0 specs, a standard downstream port is capable of delivering up to 500mA (0.5A); in USB 3.0, it moves up to 900mA (0.9A).
Each of the three differential channels is compliant with the USB 2.0 (high speed), USB 1.1 (full speed) and USB 1.0 (low speed) standards, as well as any generic universal asynchronous receiver/transmitter (UART) protocol.
As a result, they will be labeled as Certified Wireless USB products and will bear the Certified Wireless USB logo alerting consumers that the merchandise has proven to be compliant with the Wireless USB 1.0 Specification from the USB-IF and achieved certification.
For example, amateurs working with inexpensive webcams are forced to record video clips at only five frames per second in order to avoid image-compression artifacts inherent with faster frame rates on relatively slow USB 1.0 connections.
Following the Wireless USB 1.0 specification's official release, USB Explorer 200PRO Analyzer helps companies involved in Wireless USB development to meet rapid time-to-market requirements as well as customers' demands for seamless interoperability between manufacturers' products.
Some of the host bus speeds are 12MBps for USB 1.0, 40MBps for UltraSCSI, 50MBps for 1394a, 60MBps for USB 2.0, 80MBps for Ultra2 SCSI, 100MBps for 1394b, 150MBps SATA Gen1, 160MBps Ultra160 SCSI, 300MBps for SATA Gen2, 320MBps Ultra320 SCSI.
You connect it to your computer at any open USB port, even those supporting the older USB 1.0 speeds.
The fact that one of the models supports both USB 1.0 and 2.0 means that data can be transferred from one USB-enabled PC or Mac to another in an office environment without the need for a high speed network.
USB 2.0--dubbed "Hi-Speed USB 2.0" in the marketplace by the USB Implementers Forum--increases the speed of the peripheral to PC connection from 12 Megabits per second to 480 Megabits per second, or 40 times faster than USB 1.0. The higher bandwidth is a major boost for external peripherals such as CD/DVD burners, scanners, cameras, and hard drives.