Summary |
There are three primary cabling media that can be used with a LAN at the physical layer; Twisted pair cable, Coaxial cable and Fiber-optic cable. |
Twisted pair cable consists of two insulated strands of copper wire twisted together. |
Coaxial cable is a conducting center wire surrounded by an insulating layer, a layer of wire mesh and a non-conducting outer layer. |
Two popular types of Coaxial cable are Thinnet and Thicknet. Optical fibers are used to carry digital data signals in the form of modulated pulses of light. |
Encoded signals can be transmitted over cable two ways, broadband and Baseband transmission. |
Broadband transmissions use analog signaling and Baseband transmissions use digital signaling. |
Three widely used LAN topologies are bus, star and ring topologies. |
A bus topology connects each computer to a single cable. In a star topology, each station is connected to a special unit called a hub. |
On a ring network, stations are situated on a continuous network loop. |
Thursday, February 5, 2009
Summary
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