NETWORKING

 Introduction to networking

 

Defenition

is a collection of computer and other hardware interconnected by communication channels that allow sharing of resources and information.

Wired technologies:

The order of the following wired technologies is, roughly, from slowest to fastest transmission speed.

Twisted pair :wire is the most widely used medium for telecommunication. Twisted-pair cabling consist of copper wires that are twisted into pairs. Ordinary telephone wires consist of two insulated copper wires twisted into pairs. Computer networking cabling consists of 4 pairs of copper cabling that can be utilized for both voice and data transmission
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Coaxial cable: is widely used for cable television systems, office buildings, and other work-sites for local area networks. The cables consist of copper or aluminum wire surrounded by an insulating layer (typically a flexible material with a high dielectric constant), which itself is surrounded by a conductive layer. The insulation helps minimize interference and distortion.

 

 
optical fiber: is a glass fiber. It uses pulses of light to transmit data. Some advantages of optical fibers over metal wires are less transmission loss, immunity from electromagnetic radiation, and very fast transmission speed, up to trillions of bits per second. One can use different colors of lights to increase the number of messages being sent over a fiber optic cable