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.

usb.org.
References in periodicals archive ?
- Provide advice and test the use of USB software dongles in a virtualised environment;
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Under the terms of the partnership, Jungo will provide Nufront with USB software and support to enable USB connectivity for the Nufront mobile baseband chipsets in mobile devices, PCs, laptops and peripherals.
"The growing support for USB 3.0 and wide usage of USB 2.0 was a compelling reason to improve the USB software stack," said Dennis Flanagan, Microsoft's director of program management for the devices and networking group.
The company's complementary USB software suite helps add a USB 3.0 peripheral port to PCIe-based systems, as well as convert PCIe endpoints to a USB 3.0 product.
Along with native speeds like these it comes pre-installed with a TurboHDD USB software, with which the transfer performance is further accelerated, reaching up to a speed of 140 MB/s, however we included the native speeds in our tests as we wanted to feature the hardware capabilities of the hard drive.
The solution uses a Palm webOS application called CL USB Sync on the Palm Pre and the CompanionLink for webOS USB software on the PC and can synchronise with the Palm Desktop, Microsoft Outlook, Lotus Notes or Novell Groupwise.
Sierra Wireless PCI Express Mini Card modules include a common comprehensive WHQL-certified USB software driver architecture that provides superior power management, a dedicated diagnostic channel, and the ability to enable or disable NDIS or DUN support, providing maximum flexibility to OEM customers when designing their wireless product.
STMicroelectronics (NYSE:STM), a world leader in microcontroller development, has announced a USB software Developer Kit for the STR7 and STR9 microcontroller families that will greatly simplify the implementation of embedded software to handle the relatively complex USB interface standard.
Atmel(R) Corporation (NASDAQ:ATML), a global leader in the development and fabrication of advanced semiconductor solutions, and Jungo(R) Software Technologies, a provider of USB/PCI software solutions, have debuted Jungo's USBware(TM) Embedded USB Software Stacks for Atmel's Smart ARM(R) Microcontrollers.
Sierra Wireless PCI Express Mini Card modules include a common comprehensive WHQL-certified USB software driver architecture that provides superior power management, a dedicated diagnostic channel and the ability to enable or disable NDIS or DUN support, which provides maximum flexibility to OEM customers when designing their wireless product.
The ST92163-DEMO/MS kit and has been fully plug tested by the international USB Compliance Workshop and is included on the list of USB software integrators.