Computer Assignment #2 - Knowledge Store

 Q.No.1:What is Guided Media. Explain its different types?

       Answer:~

Guided Media 

                  In Guided Media, communication devices are directly connected with each other by using some physical media like wires.it is also called Bounded Media.

Examples:

~Twisted Pair

~Coaxial Cable

~Fiber Optic

                    Types of Guided Media

1.Twisted Pair 

               Twisted pair is the most commonly used physical transmission medium. It is used in Local Area Network to connect computers and other devices.
                 Twisted pair consists of a pair of copper wires. The pair of wires is covered by a plastic insulation and it is twisted together. Twisting of wire protects them from interference by external electromagnetic waves.

Characteristics of Twisted Pair

                 Different characteristics of twisted pair are as follows:

~It is an inexpensive transmission medium.

~It is easy to install.

~It can transfer data to a short distance.

2.Coaxial Cable

               Coaxial cable consists of copper wire covered by an insulation material. The insulated copper wire is covered by copper mesh. The mesh protects the data signals from interference by external electromagnetic waves. Coaxial cable contain 4 to 22 Coaxial units called tubes. Coaxial cables are used by the cable TV network and telephone companies.

Characteristics of Coaxial Cable

                  Different Characteristics of coaxial cable are as follows:

~It is more expensive transmission medium than twisted pair.

~It provides higher data transfer rate than twisted pair cable.

~It can be installed very easily.

3.Fiber Optic

                 A Fiber Optic cable transmits data as pulses of light through tiny tubes of glass. A typical Fiber Optic consists of every narrow strand of glass called core. The strands are thin like human hair. The core is the center of the fiber where light travel. There is a concentric layer of glass around the core called cladding. It reflects the light back into the core. The cladding has a protective coating of plastic called jacket.

                 An important characteristic of fiber optic is refraction. Refraction is the characteristic of a material to either pass or reflect light. Most telephone companies, ISI's and cable TV operators are using fiber optic in their networks.

*Advantages of Fiber Optic 

~Fiber Optic networks work at a very high speed.

~The information carrying capacity of Fiber Optic is very high.

~It is more secure and reliable form of data transmission.

~Fiber Optic is lighter and smaller in size.

~It is not affected by electromagnetic waves.

*Disadvantages of Fiber Optic

~It is difficult to install.

~It is expensive.