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Transmission Media And Its Types

Transmission Media(Cont.)


1.          Guided Media:


b) Coaxial Cable:
Coaxial cable refers to a type of cable that has an inner conductor surrounded by a tubular insulating layer, surrounded by a tubular conducting shield. Usually coaxial cables also have an insulating outer sheath or jacket.
It is also referred as the primary type of cabling which is used by the cable television industry and is also widely used for computer networks, such as Ethernet.Although it is more expensive than standard telephone wire,but it is much less susceptible to interference and can carry much more data. 

c)  Optical Fiber:
An optical fiber is a flexible, transparent fiber made of extruded glass (silica) or plastic. It is used to transmit light between the two ends of the fiber. Commonly the field of applied science and engineering which deals with the design and application of optical fibers is known as fiber optics. Optical fiber carries much more information than conventional copper wire and is in general not subject to electromagnetic interference and the need to re-transmit signals. Most telephone company long-distance lines are now made of optical fiber. Fiber optic cables have a much greater bandwidth than metal cables.This means that they can carry more data.Fiber optic cables are much thinner and lighter than metal wires. 
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