What Are The Three Major Classes Of Guided Media?

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Shumaela Rana answered
The Guided Transmission Media is a media which use a "cabling system" that guides the data signals along some specific and explicit path. These data signals are actually bound by the cabling system. This type of media is also called "bound media".
Guided media can generically be divided into four types. These are: (1) Open Wire, (2) Twisted Pair, (3) Coaxial Cable and (4) Optical Fiber
The first type of guided media - open wire media - is usually describes as an electrical wire that is strung up along the power poles. There is no facility of shielding is provided in this media so noise interferences while communication can not be avoided. So in simple words we can say that it is a path for data signal without any protection from noise interruptions. So this type of media is at risk to a great extent to noise interferences so it is not a good practice to use it for data transmission for more than 20 ft.
The second type of guided media is twisted pair in which cables are twisted together in pairs. Each pair consists of a wire for a positive data signal and another wire for negative data signal. The level of noise interference reduction can be determined particularly by the number of turns used per foot. They are inversely proportion to each other.
Then the third type of guided media is coaxial cable that consists of two conductors. The outstanding control of the electric resistance characteristics of the cable permit higher data rates to be transferred than twisted pair cable.
Finally, there comes Optical Fiber that consists of very thin glass fibers which are capable to carry information at the frequencies in visible light spectrum and even beyond.

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