USBUniversal Serial Bus
A USB Series “A” plug, the most common USB plug
Universal Serial Bus (USB) is a serial bus standard to interface devices. USB was designed to allow many peripherals to be connected using a single standardized interface socket and to improve the plug-and-play capabilities by allowing devices to be connected and disconnected without rebooting the computer (hot swapping). Other convenient features include providing power to low-consumption devices without the need for an external power supply and allowing many devices to be used without requiring manufacturer specific, individual device drivers to be installed.
USB is intended to help retire all legacy varieties of serial and parallel ports. USB can connect computer peripherals such as computer mouse, keyboards, PDAs, gamepads and joysticks, scanners, digital cameras, printers, personal media players, and flash drives. For many of those devices USB has become the standard connection method.
USB was originally designed for personal computers, but it has become commonplace on other devices such as PDAs and video game consoles. As of 2008, there are about 2 billion USB devices in the world.[1]
The design of USB is standardized by the USB Implementers Forum (USB-IF), an industry standards body incorporating leading companies from the computer and electronics industries. Notable members have included Agere (now merged with LSI Corporation), Apple Inc., Hewlett-Packard, Intel, NEC, and Microsoft.
Contents
1 History
2 Overview
3 Host controllers
4 Device classes
4.1 USB mass-storage
4.2 Human-interface devices (HIDs)
5 USB signaling
6 USB protocol analyzers
7 USB connector properties
7.1 Usability
7.2 Durability
7.3 Compatibility
8 Types of USB connector
8.1 Proprietary connectors and formats
9 USB cables
9.1 Maximum Useful Signalling Distance
10 Power
10.1 Non-standard devices
10.2 PoweredUSB
11 USB compared with FireWire
12 Version history
12.1 Prereleases
12.2 USB 1.0
12.3 USB 2.0
12.4 USB 3.0
13 Related technologies
14 See also
15 References
16 External links
16.1 USB 3.0
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