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UNIVERSAL SERIAL BUS

UNIVERSAL SERIAL BUS 

    Any computer that you buy today comes with one or more Universal Serial Busconnectors on the back. These USB connectors let you attach everything from mice to printers to your computer quickly and easily. The operating system supports USB as well, so the installation of the device drivers is quick and easy, too. Compared to other ways of connecting devices to your computer (including parallel ports, serial ports and expansion cards that you install inside the computer's case), USB devices are incredibly simple. 

    Most computers that you buy today come with one or two USB sockets. With so many USB devices on the market today, you easily run out of sockets very quickly. The Universal Serial Bus gives you a single, standardized, easy-to-use way to connect up to 127 devices to a computer. USB Features 

The Universal Serial Bus has the following features: 
• The computer acts as the host. 
• Up to 127 devices can connect to the host, either directly or by way of USB hubs. 
• Individual USB cables can run as long as 5 meters; switch hubs, devices can be up to 30 meters (six 
cables' worth) away from the host. 
• With USB 2.0, the bus has a maximum data rate of 480 megabits per second. 
• A USB cable has two wires for power (+5 volts and ground) and a twisted pair of wires to carry the 
data. 
• On the power wires, the computer can supply up to 500 milliamps of power at 5 volts. 
• Low-power devices (such as mice) can draw their power directly from the bus. High-power devices (such as printers) have their own power supplies and draw minimal power from the bus. Hubs can have their own power supplies to provide power to devices connected to the hub. 
• USB devices are hot swappable, meaning you can plug them into the bus and unplug them any time. 
• Many USB devices can be put to sleep by the host computer when the computer enters a power-
saving mode.


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