Data Communication & networking

This blog is for undergraduate/graduate students who require some basic information about their subjects or any other topic related to data communication.

Monday, 28 March 2011


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.
The HUB is the active central element of the star layout. the stations are connected with hub by two lines ( transmitting & recieving).

 A network hub is a fairly unsophisticated broadcast device. Hubs do not manage any of the traffic that comes through them, and any packet entering any port is regenerated and broadcast out on all other ports. figure shows a shared medium hub. the total capacity of LAN is 10Mbps, if any station is transmitting, the hub retransmit it on all of the outgoing line.

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