Lesson Notes By Weeks and Term - Senior Secondary 1

Term: 3^rd Term

Week: 1

Class: Senior Secondary School 1

Age: 16 years

Duration: 40 minutes of 2 periods each

Date:       

Subject:      Computer Studies and ICT

Topic:-       Communication systems

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

1. State the full meaning of ICT
2. State the types of ICT
3. List types of broadcasting
4. List types of telecommunications systems

.INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, pictures, Data Processing for senior Secondary Education by Hiit Plc, WAPB Computer Studies for Senior Secondary I by Adekunle et al, On-line Materials.

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

NOTE

COMMUNICATION SYSTEMS

ICT stands for Information and Communications Technology. It is used to describe all devices that can be used to create, communicate, disseminate, store, manage and provide access to information. These devices include radio, television, mobile phones, computers, the Internet, satellite systems etc.

TYPES OF INFORMATION AND COMMUNICATIONS TECHNOLOGY (ICT)

There are different types of ICT, which include:

1. Broadcasting
2. Telecommunications
3. Data Networks
4. Information Systems
5. Satellite Communications

1. BROADCASTING

Broadcasting is the spreading or distribution of audio and video content over a wide area to a large audience through any electronic mass communications medium like radio, television, etc.

In computer networking, broadcasting refers to the simultaneous distribution of the same information to many recipients, which is made possible when a transmitted data packet is received by all network devices.

A data packet means small unit of data. Breaking communication down into packets allows the same data path to be shared among many users in the network.

Types of Broadcasting

There are three basic types of broadcasting, which are:

i. Radio Broadcasting

ii. Television Broadcasting

iii. Satellite TV System Broadcasting

1. Radio Broadcasting: This involves sending or transmitting information or entertainment signals to a large audience, who will receive or listen to it through a radio set. This can be via AM (Amplitude Modulation), FM (Frequency Modulation) or HD (High Definition) radio which transmits digital audio and Data along with AM and FM analog signals.
2. Television Broadcasting: This is the transmission of information or entertainment signals in form of moving images, with or without sound, from a television station to television sets. These signals are transmitted by UHF (Ultra High Frequency) or by VHF (Very High Frequency) waves. Television Programme were first transmitted in analog format and now in digital format.
3. Satellite TV System Broadcasting: This is the transmission of audio and video signals from the television station to an orbiting satellite in space, which magnifies the signals and rebroadcasts it back to earth. These signals are captured by dish receivers placed on top of buildings and then converted by decoders to digital TV signals.

2. TELECOMMUNICATIONS

Telecommunications is the transmission of audio and video signals over long distances using cables, telephones, radio, television, etc. All electronic devices used for transmitting this information are called telecommunications systems.

Types of Telecommunications

The different types of telecommunications include:

1. Public Switched Telephone Network System (PSTNS)
2. Mobile Phone System (GSM)
3. Circuit Switched Packet Telephone System (CSPTS)
4. Satellite Telephone System.
5. Fixed Wireless Telephone System (FWTS)

i. Public Switched Telephone Network (PSTN): This is also referred to as Landline or Plain Old Telephone Service (POTS). It is a wired phone system over which landline calls are made. Lt provides phone service to the public by carrying analog voice signals or data via copper cables. In other words, it allows people to communicate over the telephone.

ii. Mobile Phone System or Global System for Mobile Communications (GSM): This is a second-generation (2G) digital telephone network that enables individuals use mobile handsets to communicate with voice and text messages.

iii. Circuit Switched Packet Telephone System (CSPTS): This is a system that guarantees that a telephone call from one person to another remains connected for the duration of the call, unless it is disconnected by the caller or receiver.

Note: that the communication circuit or path for the call is set up and restricted only to the participants making the call. Thus, for the duration of the connection, all resources on that circuits will be made unavailable for other users.

iv. Satellite Telephone System: This system allows users to communicate with phones that connect with low earth orbiting satellites. There are three major satellite Telephone systems; Iridium, Thuraya, Globalstar.

v. Fixed Wireless Telephone System (FWTS): This system allows users to communicate with each other within a building (home or office) or between two fixed locations that have been connected with a wireless link, using a handset. It does not have the roaming advantage of GSM.

EVALUATION:    1. State the full meaning of ICT

2. State the types of ICT
3. List the types of broadcasting
4. List the types of telecommunication systems

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively