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Physical Layer

Posted Date: 22 May 2008 Resource Type: Articles/Knowledge Sharing Category: Education

Posted By: Vidya Member Level: Diamond
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Points: 1

Physical Layer

The Physical layer is responsible for turning some medium into a bit pipe. Copper cabling is the most common data-networking medium of LANs and in the local loop, while fiber optic cabling is prevalent in most wide area networks—and is perhaps the local-loop and the LAN medium of the future. Radio frequency bands also play a role in some data networks, including signals that are relayed via satellites. Some local networks and point-to-point links employ infrared signals propagated through space, and visible light lasers are sometimes used to transmit data without the aid of a fiber optic cable.

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