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Switches normally have numerous ports, facilitating a star topology for units, and for cascading additional switches. A repeater is an digital gadget that receives a network signal, cleans it of pointless noise and regenerates it. The sign is retransmitted at a better power stage, or to the opposite aspect of obstruction so that the signal can cowl longer distances with out degradation. In most twisted pair Ethernet configurations, repeaters are required for cable that runs longer than 100 meters. With fiber optics, repeaters may be tens or even lots of of kilometers apart. Free-space optical communication uses visible or invisible light for communications.


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