An Ethernet hub, active hub, network hub, repeater hub, multiport repeater, or simply hub[a] is a network hardware device for connecting multiple Ethernet devices together and making them act as a single network segment. It has multiple input/output (I/O) ports, in which a signal introduced at the input of any port appears at the output of every port except the original incoming.[1] A hub works at the physical layer.[2] A repeater hub also participates in collision detection, forwarding a jam signal to all ports if it detects a collision. In addition to standard 8P8C ("RJ45") ports, some hubs may also come with a BNC or an Attachment Unit Interface (AUI) connector to allow connection to legacy 10BASE2 or 10BASE5 network segments.
Hubs are now largely obsolete, having been replaced by network switches except in very old installations or specialized applications. As of 2011, connecting network segments by repeaters or hubs is deprecated by IEEE 802.3.[3][4][5]
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- ^ IEEE 802.3-2012 Clause 9.1
- ^ Cite error: The named reference
networkingtextwas invoked but never defined (see the help page). - ^ IEEE 802.3 9. Repeater unit for 10 Mb/s baseband networks
- ^ IEEE 802.3 27. Repeater unit for 100 Mb/s baseband networks
- ^ IEEE 802.3 41. Repeater unit for 1000 Mb/s baseband networks