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USB Hubs
Just as you would add a power bar for additional outlets, USB hubs let you to do same except to add more USB ports for peripheral connections. They often come in 2 varieties: 4-port and 7-port USB hubs. Other more advanced USB hubs combine with serial, parallel, Ethernet and maybe USB audio / video output to form a brand-independent laptop docking station.
Installing a USB hub is simply a job of connecting the hub itself, AC adapter and USB cable, but if you already have a mix of Hi-Speed USB and classic USB devices, getting them to coexist could be a challenge. The reason is that two isochronous devices (real-time video & audio) can already saturate the classic speed bus. If you need a couple of different classic USB devices to operate simultaneously, multi-transaction translator USB hubs are crucial as they allocate dedicated 12Mbps bandwidth.
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