Hubs are now largely obsolete, having been replaced by network switches except in very old installations or specialized applications. 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. A repeater hub also participates in collision detection, forwarding a jam signal to all ports if it detects a collision. A hub works at the physical layer (layer 1) of the OSI model. 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. Device for interconnecting Ethernet devices 4-port 10BASE-T Ethernet hub with selectable MDI-X/MDI port 8-port Ethernet hub with one 10BASE2 connector and eight 10BASE-T portsĪn Ethernet hub, active hub, network hub, repeater hub, multiport repeater, or simply hub is a network hardware device for connecting multiple Ethernet devices together and making them act as a single network segment.
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