An
Ethernet hub,
active hub,
network hub,
repeater hub or
hub is a device for connecting multiple
twisted pair or
fiber optic Ethernet devices together and making them act as a single
network segment. Hubs work at the
physical layer (layer 1) of the
OSI model. The device is a form of
multiport repeater. Repeater hubs also participate in collision detection, forwarding a
jam signal to all ports if it detects a
collision.
Hubs also often come with a
BNC and/or
Attachment Unit Interface (AUI) connector to allow connection to legacy
10BASE2 or
10BASE5 network segments. The availability of low-priced
network switches has largely rendered hubs obsolete but they are still seen in older installations and more specialized applications.
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