Friday, 10 May 2013

What is transmission media or transmission medium?


By on 01:37

Transmission media is also called as communication medium or channel.Transmission media play a very important role in computer network.In computer networking it is used to transfer resources(like data /information) from one place to another.

Transmission media are of two types:-

1)Guided Media:-Guided media is also called as physical media or wired media.In guided media one network is connected to another network using a set of wires.

Guided media are of 3 types:-

a)Twisted Pair Cable:-Twisted Pair Cable is very common in our daily life,even a phone wires is also made up of Twisted Pair Cables.It consist 8 wires and 4 pairs(2 each).Twisted Pair Cable is very cheap technology as compared to Fiber Optic cable and Coaxial cable.




Twisted Pair Cable again divided into two parts:-

->UTP:-UTP stands for Unshielded Twisted Pair cable.It is effected by EMI(Electro Magnetic Interference).

->STP:-STP stands for shielded Twisted Pair cable.It is not effected by EMI(Electro Magnetic Interference).

b)Coaxial Cable:-Coaxial Cable is made up of copper wire and it provide better shielding and carry more data as compared to Twisted Pair Cable.




Coaxial Cable again divided into two parts:-

->Thin cable:-Only one signal transmit at a time.

->Thick cable:-More than one signal transmit at a time.

c)Optical Fiber Cable:-It provide better and fast communication as compared to Twisted pair cable and coaxial cable.It transfer data at very high speed through light signal.




Optical Fiber Cable again divided into two parts:-

->Single mode Optical Fiber Cable:-One light signal transmit at a time.

->Multi mode Optical Fiber Cable:-More than one light signal transmit at a time.

2)Unguided Media:-Also called as wireless media.Some common example of unguided media are blue-tooth,infrared,satellite etc.


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1 comments:

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