Since nearly every electronic gadget manufactured today makes use of the ever-handy USB port, it seems that only two or three USB ports are not enough. So we need more additional ports and having them conveniently accessible makes all the difference. That’s what the USB hub can do.
A USB hub is a small, light unit with multiple ports for plugging in USB devices. It is commonly connected to a USB port located on the back of a desktop computer by using an extension cable. Once the hub is plugged in, you can set it wherever is convenient, avoiding the hassle of accessing the rear of the system. A USB hub is also great for laptops with only one or two ports. Most hubs can support up to 127 devices.
There are two types of USB hubs that can be used, according to the type of peripherals connecting to them: powered and unpowered.
A self-powered USB hubs can be used to connect digital cameras, card readers, keyboards, mice, MP3 players, memory sticks and many other handheld USB devices. For more robust components such as external drives, printers, scanners or fax machines, an AC-powered USB hub is a better choice.
Unpowered USB hubs are generally used for devices that have their own power supplies, such as printers or scanners, but can also be used to connect a small number of low-power peripherals that do not have separate power supplies and receive energy from the motherboard, like mice for example.
However, if you want to connect multiple low-power devices through the hub, the electric current provided by the computer (approximately 5 volts at 500 milliamps) may not be enough to supply energy for both the peripherals and the hub.
Considering that the USB 1.0 standard allows a maximum information transfer rate of 12 megabits per second and the USB 2.0 standard 480 megabits per second, and the fact that typical devices only require about 6 megabits per second, one could practically connect up to 80 devices at the same time to a personal computer with the help of several USB hubs.
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