SSS ONE WEEK THREE LESSON NOTE (ICT_223)

 

Ss1

TOPIC:  COMMUNICATION SYSTEM II

Introduction

Major advances in the field of broadcasting, communication and information technology (IT) during the last decade has had a great impact on the information and broadcasting sector.

Types of ICT

The following are the types of ICT

1.     Broadcasting

2.     Telecommunication

3.     Information system

4.     Satellite communication

Broadcasting: it is the distribution of radio and video content to a dispersed audience via any audio or visual mass communication medium, but usually one using electromagnetic radiation radio waves. It is a method of transmitting signals such as radio or television programs to relatively large group of recipients.

Telecommunication: is the assisted transmission of signals over a distance for the purpose of communication. In earlier times, this might have involved the use of smoke signals, drums, flags or heliographs. A telecommunication system consists of three basic elements: a transmitter, a transmission medium and a receiver that receives the signal and convert it back to usable information.

Data networks: data network is an electronic communications process that allows for the orderly transmission and reception of data, such as letters, spreadsheets and other types of documents. What sets this type of network apart from other forms of communication such as an audio network, is that it is configured to transmit data only.

Information system: information system is a combination of people, hardware, software communication devices, network and data resources that process data and information for specific purpose. Information system can be divided into four (4) major categories which are:

1.     Transaction Processing System (TPS)

2.     Management Information System (MIS)

3.     Decision Support System (DSS)

4.     Executive Support System (ESS)

 

Satellite communications: satellite is a solid object that revolves around some heavenly body due to the effect of gravitational forces which are mutual in nature. In satellite communication, a signal transferring between sender and receiver is done with the help of a satellite. Two satellite which are commonly used in satellite communication are: Active and Passive satellites. Active satellites basically amplify the coming microwave signals, while the passive satellites are plastic balloons having metals coated over them.

Benefits of ICT

·        Information processing speed

·        Consistency

·        Accuracy

·        Reliability

·        security




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