It seems that almost all electronic gadgets are manufactured today use the USB port, the first USB computers with only one or two ports conveniently on the back of the CPU. The new devices have several integrated ports. Still, additional ports are required to be easy, for it exists USB hub.

A USB hub is a small unit, light with several ports for connecting USB devices are commonly connected to a USB port on the back of a desktop computer using a cable extension. A USB hub is also ideal for notebooks that have only one or two USB ports, when connected properly, the centers can support up to 127 devices. A powered USB hub can be used to connect digital cameras, card readers, keyboards, mice, MP3 players, memory cards and many other portable devices USB.
To connect more powerful devices such as external hard drives, printers, scanners or fax machines, a USB hub with AC is the best option. Some of the AC power centers, come with an adapter, while others require the purchase of a separate adapter. Another feature of the USB hub is seeking support for two versions of USB technology. Thus USB 1.1 can transfer data at speeds up to 12 megabits per second (Mbps), while USB 2.0 can transfer data at 480 Mbps, 40 times faster. Initially, the USB devices were designed to use a USB 1.1 port

A USB hub that supports the model 2.0 is compatible with devices 1.1. The hub automatically detects and runs at the fastest pace required by the device support. A hub that supports USB 2.0 can not “push” a device from 1.1 to run faster than its design. By contrast, a center that is only compatible with 1.1 can or can not support a 2.0 device, but if you do, you have to reduce speed to 12 Mbps, the fastest speed of the center support. A USB hub is an inexpensive supplement, useful for any system, especially for laptops typically have too few USB ports and native older systems that only have rear ports. A USB hub can be purchased in a four-port model, a model of seven ports, or greater capacity.