What is USB hub?
[[File:USB hub.jpg|thumb|right|USB hubs such as this one are common.]] [[Universal Serial Bus|USB]] is an [[international standard]] of technology for connecting [[Peripheral equipment|peripherals]] to [[Computer|computers]] and other devices that support it. An interface where a USB device can be connected is called a port. A '''USB hub''' is a special device which allows adding more USB ports. The additional ports share one USB connection to the computer; for this reason, each of them cannot carry as much data as a direct USB connection can. A hub may be bus-powered, which means it gets all its electrical power from the computer. This makes simple wiring, but it cannot give full power to its peripherals. A self powered hub has its own power cord, and can give full power to peripherals that need it. There are different versions of the USB standard; main difference between the version is the maximum speed that is supported. The USB standard also defines different types of USB plugs. A USB hub is a normal USB device, which was built for a given version of the standard. Certain models may support different versions of USB, while others may not. As an example: USB 3.0 can transfer payload data at up to 4 GBits per second. USB 2.0 is limited to a transfer rate of 280 MBits per second. Connecting an USB 3.0 device to the computer using an USB 2.0 hub will limit the transfer rate to that of USB 2.0. {{tech-stub}} [[Category:Computer hardware]] [[Category:USB]]