USB


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USB

Universal Serial Bus: a standard for connection sockets on computers and other electronic equipment

USB

(computer science)

USB

(architecture)

USB

(communications)

USB

(1) Short for "USB flash drive" or "USB port." See USB drive and USB port.

(2) (Universal Serial Bus) The most widely used hardware interface for attaching peripherals to a computer. There are at least two USB ports on laptops and four on desktop computers, while USB "hubs" provide more connections (see below). After appearing in 1997, USB became the standard for connecting keyboards, mice, printers and hard drives, eventually replacing the PC's serial and parallel ports and the Apple Desktop Bus on Macs (see serial port, parallel port and ADB).

Supporting 127 peripheral units on a single computer, devices can be plugged and unplugged while the computer is on, although a manual "eject" is required before removing. This "hot swappable" feature, combined with easy-to-reach ports on the front of the computer case, gave rise to the ubiquitous flash drive for transport (see USB drive). See PoweredUSB, USB device class, USB OTG, USB switch and USB toy.


USB Can Be Power Only
USB is also a power source for many small devices. This Chromecast streamer gets its DC power from a USB port (conveniently nearby in this photo). See Chromecast. (Image courtesy of Google Inc.)





                           Transfer RateVersion (Year)               (Mbps)

 USB 1.1 (1998)             1.5 & 12
  (1.5 Mbps slow channel
  for keyboards, mice, etc.)

 USB 2.0 Hi-Speed (2001)       480

 USB 3.0 SuperSpeed (2008)    4800
  (see  USB 3.0)

 USB 3.1 (2014)               9600
  (see  USB 3.1)



Type A and Type B Ports
All USB devices have sockets, and all the cables have plugs. Host sockets are Type A, and peripheral sockets are B, Mini-B or Micro-B. For expansion, hubs have a B or Mini-B socket to connect to the computer and several Type A sockets for devices (see USB hub).







USB Plug Configurations
With several type A sockets on every computer, USB cables have a Type A plug on one end and one of the B plugs on the other. There are also A-to-A extension cables. See Mini USB, Micro USB and USB OTG.
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Further, new devices with OTG will even be able to peer with existing, non-OTG USB devices--provided the manufacturer of the new device supports older hardware.
Still, no matter what you read in the trade press, USB 2.
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It is very exciting to commercialize Cypress' market-leading USB IP," noted Warren Savage, IPextreme CEO.
WiQuest's wireless USB external adapter is a cost-effective, highly-integrated design that provides wireless USB high-speed capabilities, up to 480 Mbps, for traditional wired USB devices.
Cypress is 100% committed to providing the broadest portfolio of USB solutions for the mobile handset market," said Rajiv Nema, senior product marketing manager of Cypress's High Speed USB Product Line.
For transmitter testing, the Agilent DSO80000B Series oscilloscope is used to acquire the signal, and Agilent 89600A vector signal analysis software Option BHB provides signal quality measurements on WiMedia UWB radios based on Certified Wireless USB Technology.
Initially, Certified Wireless USB compliance testing will be hosted at Intel's Wireless USB Platform Integration Lab.
The SC3222R implements an HWA through the USB interface conforming to the Mini Card form factor of 56 x 30mm.
PnPNetwork selected the EZ-USB FX2LP controller for its robust 24MB/s isochronous transfers, reaching the theoretical limit specified by USB 2.