Program Explanation Guided Transmission Media: Guided transmission media provides a channel or network between one device and another device. Three types of guided transmission media include twisted pair cables, coaxial cables and fiber-optic cables. This media has some physical limits. A signal is transmitted from one place to another with the help of these media. a) Twisted Pair Cable: It consists of two conducting wires. These two conducting wires are having plastic insulation and they are twisted together. In the twisted pair cable, one of the two wires is used to transfer the signals. The other wire is used for ground referencing. It is older than co-axial cable in respect to availability in market. It is light weight, thinner, more flexible, less expensive and it is easy to install in compare to coaxial or fiber optic cable. It is mostly used in offices or work-groups areas. Fig. 2: Twisted pair Cable The twisted pair can be classified into two types. These are: i) STP: The full form of STP is Shielded Twisted Pair. It increases its immunity to electromagnetic interference which allows it to transmit data over larger distance than unshielded twisted pair cable. It has higher transmission speed for overlong distance because of its shield. It is more expensive than UTP. It is often used in token ring topology. It has RF-insulating material. STP’s length is 100m. and speed is up to 500Mbps and no common network exceed 155Mbps in 100m. distance. But sometimes extra shielding can make the cables quite bulky. Fig. 3: Shielded Twisted Pair Cable ii) UTP: The UTP is acronym of Unshielded Twisted Pair. It is inexpensive in comparison to STP cable. It is very flexible and easy to install. So the cable installer prefers it more. Like STP, it does not have RF-insulating material. Inside the jacket, it has four pairs of wires. It generally uses the following connectors which are RJ 45, RJ 11, RJ 232 and RJ 449. The maximum length of UTP cable is 100m and it provides the speed up to 100 Mbps.

9th Edition

ISBN: 9781337097536

Author: Ralph Stair, George Reynolds

Publisher: Cengage Learning

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Chapter 4, Problem 3DQ

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Determine the three common guided transmission media.

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Fundamentals of Information Systems

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