Page 84 - DLIS408_INFORMATION_TECHNOLOGY-APPLICATIONSL SCIENCES

Unit 6: Information and Communications Technology

Advantages of Microwave Communications Notes

Microwave communications offer the following benefits over other media:
It is relatively similar to set up a microwave communication system by just having a small
plot of ground every 50 Km distance and putting a microwave tower on it.
Microwave is relatively less expensive. The cost of making towers and installing antennas
on them is cheaper than installing cables.
A satellite link using microwave frequencies is the best medium of data transmission in a
large geographical area (such as between two countries) for wireless networks.

Uses of Microwave Communications
Microwave communication is widely used in following areas:
Long-distance telephone
Cellular Telephones
Television Distribution
Wide Area Networks (WANs)

6.6.3 Infrared Waves

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Infrared waves operate at frequencies ranging from 10 to 10 Hz. They are relatively directional,
cheaper and easier to build. As they do not pass through solid walls, an infrared system in one
room of a building do not interfere with similar systems in adjoining rooms.
Uses of Infrared Waves. The remote control used on televisions, VCRs, and stereos use infrared
waves. In recent years, infrared wireless transmitters on cable television and remote control
devices have gained popularity for exchanging data locally. Some laptops also have infrared
devices for exchanging data with desktop PCs and peripherals such as keyboards, printers, etc.

Task Prepare a short note on wireless communication.

Self Assessment

State whether the following statements are true or false:
9. The core is surrounded by a glass having lower refractive index known as core.
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10. The frequencies of microwave portion of the electro-magnetic spectrum range from 10 Hz
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to 10 Hz.
11. A geostationary satellite appears to be stationary to the air ground station.
12. Radio waves are mainly used to transmit radio programs.

6.7 Summary

Information and communications technology is usually called ICT.
With the advent of ICTs, learning has become Web-based.
The English word ‘communication’ is derived from the Latin noun‘communis’ and the
Latin verb ‘communicare’ that means ‘to make common’.
Communication is important both for an individual and also for the society. A person’s
need for communication is as strong and as basic as the need to eat, sleep and love.
Communication provides knowledge, expertise and skills for smooth functioning by people
in the society.

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