USB hub

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USB hub

A device that increases the number of USB ports on a PC. However, since the hub plugs into one of the USB ports on the computer, the total number of additional ports is minus one. For example, a four-port hub adds three new ports. USB hubs are typically used to extend USB sockets to the top of the desk for conveniently connecting external peripherals.

Self Powered Vs. Bus Powered
Self-powered hubs derive their power from a wall outlet and usually provide up to 500 milliamps at each port. In contrast, bus-powered hubs plug only into the computer's USB bus and obtain all their power from the bus. As a result, they have to split the total 500 milliamps among all the ports and the hub itself, which generally draws 100 milliamps. For example, a four port bus-powered hub would have 100 milliamps of power at each port. When not plugged into an AC outlet, a self-powered hub may sometimes be able to function as a bus-powered hub.

Keyboards and mice typically need less than 100 milliamps, but USB drives and external hard disks need more. See USB switch, PoweredUSB and USB.

USB Hubs
Note the self-powered hub at top right. It adds three Type A ports to the computer. Although it provides four Type A ports for devices, it already takes up one on the computer, netting three additional. Monitors may also contain a USB hub, which can be self powered or bus powered.
References in periodicals archive ?
The price of Amkette OTG USB Hub and Card Reader is worth INR 945/- and is reachable throughout major retail stores in India and at all e-commerce portals.
Included in the 4-port USB Hub are two ALWAYS ON USB ports, which are suitable for charging mobile phones and MP3 players.
The deployment of end-user products like D-Link's Wireless USB Hub and Adapter is vital when transitioning a new technology into the marketplace," said Jeff Ravencraft, USB-IF president.
Consumers expected to plug any USB device into any USB hub, and for those devices to charge.
The Wireless USB hub provides four USB ports and features dual internal antennas inside a slim enclosure, as well as PHY capabilities, developed by Wisair, for extended coverage.
When used in a basic USB hub box, the USB2517 provides up to seven additional USB 2.
The device adapter can also be attached to a USB hub, turning it into a Wireless USB hub.
Bott has begun shipments of its new 3-port USB hub.
LAS VEGAS -- Cables To Go[TM], a leading provider of high-performance cabling and connectivity solutions, today announced a new Certified Wireless USB hub that eliminates USB cables between the device and the PC.
today announced that its Certified Wireless USB device wire adapter (DWA) chip, the uPD720180, has been integrated into a Wireless USB Hub and Adapter Kit (GUWH104KIT) from IOGEAR, Inc.
Worldwide Computer Products News-23 February 2000-Premier Electronics launches USB hub (C)1995-2000 M2 COMMUNICATIONS LTD http://www.
In addition to this award, Belkin has also accepted CES Innovation Distinctions for five other products: TuneBase[TM] FM, N1 Vision Wireless Router, Network USB Hub, Wireless USB Hub, and Washable Mouse.