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What Do You Mean By Transmission Media:

What Do You Mean By Transmission Media It describes the type of physical system used to carry a communication signal from one system to another. Examples of transmission media include twisted-pair cable, coaxial cable, and optical fibre cable.


CLASSIFICATION OF MEDIA TYPES Twisted Pair Coaxial Cable Fiber Optic


TWISTED PAIR CABLE Twisted pair cabling is a type of wiring in which two conductors of a single circuit are twisted together for the purposes of canceling out electromagnetic interference (EMI) from external sources. It was invented by Alexander Graham Bell.

Advantages of Twisted Pair:

Advantages of Twisted Pair Least Expensive Can transmit both analog and digital Most commonly used in Telephone networks.

Types of Twisted Pair Cable:

Types of Twisted Pair Cable Unshielded Twisted Pair Cable (UTP) Set of twisted pair of cables within a plastic sheet. Transmission rate of 10-100mbps. Very flexible and easy to work.

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Shielded Twisted Pair Cable (STP) Each pair of wire is in metallic shield. Good insulation qualities Installation is easy Not commonly used as compared to UTP


COAXIAL CABLE It is an electrical cable Invented by Oliver Heaviside in 1880. Used in Cable Television network Used for both analog and digital data transmission. Where A= outer plastic sheath B=woven copper sheath C=inner dielectric insulator D=copper core

Advantages of Coaxial Cable:

Advantages of Coaxial Cable Greater Bandwidth Lower Error Rates Used for both Analog and Digital data.


OPTIC FIBRE An optical fiber is a flexible, transparent fiber made of glass (silica) or plastic, slightly thicker than a human hair. It functions as a waveguide, or “light pipe”, to transmit light between the two ends of the fiber. Invented by Daniel Colladon in Paris in 1840s.


ADVANTAGES These have greater bandwidth than copper transmission lines. These are lighter, smaller in diameter and often less expensive than copper lines. Optical fibre have higher carrying capacity.

Differences Between:

Differences Between Twisted Pair Cable Coaxile Cable Optical fibre Bandwidth is low Its 1 Mhz Bandwidth is quite high Its 1 Ghz Bandwidth is very high. Cheapest Moderately costly Very costly Low Data Moderately High Data Rates High Data Rates


QUIZ Q1) Who invented Twisted Pair Cable? a) Oliver Heaviside b) Alexander Graham bell c) Danial Colladon d) Jaques Babinet

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Q2) What is the transmission rate of Unshielded twisted pair cable? a) 10-100Mbps b) 20-200Mbps c) 5-75Mbps d) 15-150Mbps

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Q3) Which one among these is least expensive? a) Twisted Pair Cable b) Coaxile Cable c) Optical Fibre Cable

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Q4) In which year was the coaxile cable introduced? a) 1885 b) 1886 c) 1887 d) 1840

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Q5) Which one among these is non-flammable? a) Twisted Pair Cable b) Optical Fibre c) Coaxile Cable d) None of these

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