There are two versions of USB technology. USB 1.1 is capable of data transfer speeds up to 12 megabits per second (mbps), while USB 2.0 can transfer data at 480 mbps, 40x faster. Initial USB devices were engineered to use USB 1.1, while later devices took advantage of the newer 2.0 compliancy. USB 3.0 has evolved and being used widely.
Firewire hubs are available to allow you to expand the number of firewire ports available for use.
A network hub is a small rectangular box, often made of plastic, that receives its power from an ordinary wall outlet. A hub joins multiple computers (or other network devices) together to form a single network (Segment). On this network segment, all computers can communicate directly with each other. Ethernet hubs are by far the most common type, but hubs for other types of networks such as USB also exist.
Left to right above:
Network USB Hub for sharing devices. It needs to be used
with a Network Router
Ethernet Hub with modem for internet connection allowing multiple computers to share the internet, files and devices via cable connection into the hub. Wireless connection routers/hubs are by far the most popular now (no cables required)
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