What Is A Usb Device?

A USB is a hardware device that connects and works on a computer Universal Serial Bus (USB) interface - a socket standard that allows connection and disconnection device without having to reboot the computer. USB control devices in a master / slave.

The USB interface is developing a computer plug and play capabilities, as it allows a wide range of devices that have been specially created for USB to be connected with the PC, whether with or without the device drivers installed. USB standard design was carried out by the USB Implementers Forum (USB-IF), a consortium of major computer and electronic companies that serves the industry standards body. As a result of standardization, the third part of the material is identical on all platforms and differs only in OS-specific software.

The benefits of USB side of scalability are lower production costs, self-configuring, improving performance and speed reliable. The USB interface provides electricity to devices without needing an adapter. Communes USB devices include mice, keyboards, joysticks, webcams, games and other platelets low bandwidth devices.

The USB controllers

Before USB 2.0, there are two competitors host control device implemented: the Open Host Controller Interface (OHCI) developed by Microsoft, Compaq and National Semiconductor, and the universal Host Controller Interface (UHCI) made by Intel. The USB-IF mandated a unified application version USB 2.0, resulting in Strengthen Host Controller Interface (EHCI). EHCI only supports hi-speed transfer up to 480 Mbit / second, while competition implementation of origin have been preserved as a companion or controllers virtual hosts for backward compatibility. The virtual host controllers support full speed (12 Mbit / second) and low-speed (1.5 Mbit / second) shipments.

Operative classes
Among the many classes defined device, ordinary users will probably meet the following:

o audio interface devices - the speakers, a microphone, sound card
o communication equipment - Ethernet adapter and serial modem
o human interface devices - joystick, mouse, keyboard
o imaging equipment - camera, printer
o devices mass storage - Flash drive, memory card reader, digital audio players,
external drives
o USB
o smart card readers
o video devices - webcam
o wireless controllers - Bluetooth adapter, WiFi adapter

By: Roberto Bell

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Anthony Walker writes on topics such as www.tech-faq.com/usb.shtml "> USB, www.tech-faq.com/pci.shtml"> PCI and www.tech-faq.com/computer-port. shtml "> Port for The Tech FAQ.