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the central part of a rotating component, such as a flywheel, pulley, or gear, with an opening used to mount the part on a shaft or axle. The opening usually has a keyway or splines to transmit torque. In cases where the component is designed to rotate freely on the axle, the hub opening is fitted with a pressed-in bushing or rolling-contact bearing. To ensure strength, hubs are usually designed with an outside diameter 1.5–1.8 times the diameter of the opening. To prevent misalignment of the component on the shaft, the thickness of the hub should be at least equal to the diameter of the opening.
In ARCnet, a hub is used to connect several computers together. In a message handling service, a number of local computers might exchange messages solely with a hub computer. The hub would be responsible for exchanging messages with other hubs and non-local computers.
hub(1) See Web hub, digital media hub and intelligent hub.
(2) In an Ethernet network, a device to which all clients and servers are wired. Most Ethernet hubs are active hubs and regenerate the data bits on the output side in order to maintain a strong signal. Ethernet hubs have mostly given way to Ethernet switches. See Ethernet, hub vs. switch and LAN.
(3) In a Token Ring network, a device to which all clients and servers are wired. It is officially known as a "Multi-station Access Unit" (MAU). See Token Ring and LAN.