Review The Usb Hub

Review The Usb Hub



review the usb hub
The hub has its own transformer and it​ supplies power to​ the bus so that the devices do not overload the computer 's supply .​
If you have lots of​ unpowered devices like mice and cameras, you probably need a​ powered hub .​
If you have lots of​ self-powered devices (like printers and scanners), then your hub does not need to​ be powered -- none of​ the devices connecting to​ the hub needs additional power, so the computer can handle it.
The power (up to​ 500 milliamps at​ 5 volts) comes from the computer .​
Obviously, a​ high-power device like a​ printer or​ scanner will have its own power supply, but low-power devices like mice and digital cameras get their power from the bus in​ order to​ simplify them .​
As you will see on the next page, the USB standard allows for devices to​ draw their power from their USB connection .​
Hubs can be powered or​ unpowered.
By chaining hubs together, you can build up dozens of​ available USB ports on a​ single computer .​
You plug the hub into your computer, and then plug your devices (or other hubs) into the hub .​
hub typically has four new ports, but may have many more .​
The USB standard supports up to​ 127 devices, and USB hubs are a​ part of​ the standard .​
My computer has only one USB connector on it, so the obvious question is, How do you hook up all the devices? The easy solution to​ the problem is​ to​ buy an​ inexpensive USB hub.
For example, on the computer that I​ am typing on right now, I​ have a​ USB printer, a​ USB scanner, a​ USB Webcam and a​ USB network connection .​
With so many USB devices on the market today, you easily run out of​ sockets very quickly .​
USB Hubs Most computers that you buy today come with one or​ two USB sockets.




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