Lesson Notes By Weeks and Term v3 - Senior Secondary 1
Communication Systems
Download the Lessonotes Mobile Nigeria 2025 app for faster lesson access on Android and iPhone.
Communication Systems
Download the Lessonotes Mobile Nigeria 2025 app for faster lesson access on Android and iPhone.
Subject: Computer & IT
Class: Senior Secondary 1
Term: 3rd Term
Week: 5
Theme: Information And Communications Technology (Ict)
This page supports the lesson note with a companion video and a short classroom-ready summary.
For class groups and homework, share this lesson page so learners also get the summary, objectives, and full lesson context.
State the fullmeaning of ‘ICT’ State the types of ICT List types of broadcasting List types of telecommunicationscations systems List types of datanetwork List types of in for mation systems.
Definition: ICT stands for Information and Communication Technology. It is an umbrella term that encompasses all technologies and services used for generating, storing, retrieving, manipulating, transmitting, receiving, and communicating information. It refers to the convergence of information technology (which focuses on computing and data storage) and communication technology (which focuses on transmitting information).
Components of ICT: ICT typically involves: Hardware: Physical components like computers, servers, mobile phones, routers, etc.
Software: Programs and applications that run on hardware.
Networks: The infrastructure that connects hardware and allows communication.
Data: The raw facts and figures processed and transmitted.
People: Users, developers, and administrators of ICT systems.
Types of ICT: When referring to "types of ICT," it generally refers to the broad categories of technologies and services that fall under this umbrella.
These include: Computing Technology: This involves the use of computers (desktops, laptops, tablets, smartphones) and associated software for processing, storing, and managing data. Nigerian
Example:* Using computers in schools for JAMB CBT practice, internet browsing in cyber cafes, or for office work.
Telecommunications Technology: This deals with the transmission of information over long distances using various mediums like cables, radio waves, or satellite signals. It enables voice, video, and data communication. Nigerian
Example:* Mobile phone networks (MTN, Glo, Airtel, 9mobile), landlines, internet service providers (ISPs).
Broadcasting Technology: This involves the transmission of audio and/or video content to a dispersed audience using mediums like radio waves or satellite. Nigerian
Example:* Radio stations (Radio Nigeria, Wazobia FM), Television stations (NTA, Channels TV, AIT, DSTV, Startimes).
Data Network Technology: This focuses on connecting multiple computing devices to enable them to share resources, data, and information. Nigerian
Example:* The network of computers in a school's computer laboratory, or internet connectivity within an office building.
Information Systems Technology: These are integrated sets of components for collecting, storing, processing, and distributing information to support decision-making, coordination, control, analysis, and visualization in an organization. Nigerian
Example:* Banking systems that manage customer accounts, school management software for student records.
Definition: Broadcasting is a method of transmitting information (audio, video, or both) to a wide audience simultaneously. It is typically a one-to-many communication model.
Types of Broadcasting: Radio Broadcasting: Description: Transmission of audio signals over radio waves to receivers (radios). It is one of the oldest forms of electronic broadcasting.
Sub-types/Technologies: AM (Amplitude Modulation): Older technology, covers longer distances, but susceptible to interference.
FM (Frequency Modulation): Newer, higher fidelity (better sound quality), shorter range than AM, less prone to interference.
Shortwave Radio: Used for very long-distance, often international, broadcasting. Nigerian
Example:* Radio Nigeria (FRCN), Wazobia FM, Brila FM. Many local communities rely heavily on radio for news, music, and agricultural information, especially in rural areas without consistent electricity or internet access.
Television Broadcasting: Description: Transmission of both audio and video signals over radio waves or cables to television sets.
Sub-types/Technologies: Terrestrial Television: Signals transmitted from ground-based antennas to receivers.
Satellite Television: Signals transmitted from earth to orbiting satellites, then retransmitted back to earth to satellite dishes. Offers wider coverage and more channels.
Cable Television: Signals transmitted through coaxial or fiber optic cables. Less common in Nigeria compared to satellite and terrestrial.
Digital Television (DTV): Replaces analogue, offering clearer pictures, more channels, and interactive services (e.g., the ongoing digital switch-over in Nigeria). Nigerian
Example:* NTA (Nigerian Television Authority), Channels Television, AIT, Silverbird TV. Satellite TV providers like DSTV and Startimes are very popular in Nigerian homes. Internet Broadcasting (Webcasting/Live Streaming/Podcasting): Description: Distribution of audio and/or video content over the internet.
Examples: YouTube Live, Facebook Live, Instagram Live, Podcasts (audio shows downloaded or streamed online). Nigerian
Example:* Nigerian content creators using platforms like YouTube to reach global audiences, online radio stations, churches and mosques live-streaming services.
Definition: Telecommunication systems refer to the technologies and methods used to transmit information (voice, data, video) over significant distances, allowing for two-way or multi-way communication.
Types of Telecommunication Systems: Telephony (Voice Communication): Fixed-line Telephony (Landlines): Uses physical cables (copper wires) to connect phones. Less prevalent in Nigeria now compared to mobile.
Mobile Telephony (Cellular Networks): Uses radio waves to connect mobile phones to base stations. Highly dominant in Nigeria. Nigerian
Example:* MTN, Glo, Airtel, 9mobile networks providing voice calls, SMS, and mobile data services using technologies like GSM, 3G, 4G, and increasingly 5
G. Satellite Communication: Description: Communication that uses artificial satellites in Earth's orbit to relay signals. It is ideal for covering vast geographical areas, remote regions, and for international communication.
Applications: Satellite phones, satellite internet (e.g., Starlink entering Nigeria), satellite TV broadcasting (e.g., DSTV uses satellites to beam signals). Nigerian
Example:* Used for providing internet connectivity in very remote Nigerian villages where cable infrastructure is non-existent, and for international data links.
Fiber Optics Communication: Description: Transmits data using light pulses through thin strands of glass or plastic fiber. Offers very high bandwidth and long-distance transmission with minimal signal loss.
Applications: Backbone for internet infrastructure, high-speed corporate networks, inter-city and international data links. Nigerian
Example:* Main infrastructure for major ISPs, connecting Lagos to other cities, and for international submarine cables landing in Nigeria (e.g., MainOne, Glo-1).
Radio Communication: Description: Uses radio waves to transmit information wirelessly over short to medium distances.
Applications: Walkie-talkies, two-way radios (used by security agencies, event organizers), amateur radio. Nigerian
Example:* Used by police, military, security guards, and event planners for immediate, short-range communication.
Data Communication Systems: Description: Systems specifically designed for transmitting digital data between computers and other digital devices. This includes modems, routers, switches, and the networks they form. Nigerian
Example:* Internet cafes, corporate networks, and the general internet infrastructure enabling email, web browsing, and online transactions.
Definition: A data network is a collection of interconnected computing devices (computers, printers, servers, mobile phones, etc.) that can communicate with each other and share resources and information. Types of Data Networks (by geographical scope): LAN (Local Area Network): Description: Connects devices within a relatively small, confined geographical area, such as a single room, building, or a campus. Typically uses Ethernet cables or Wi-Fi.
Characteristics: High data transfer rates, easy to set up and manage. Nigerian
Example:* The network of computers in a school's computer laboratory, an office building's internal network, or a home Wi-Fi network.
MAN (Metropolitan Area Network): Description: Spans a larger geographical area than a LAN, typically a city or a large town. Connects multiple LANs within that city.
Characteristics: Medium to high data transfer rates, more complex than LANs. Nigerian
Example:* Connecting several branch offices of a bank (e.g., Access Bank branches) within a city like Abuja or connecting different university departments across a large campus.
WAN (Wide Area Network): Description: Spans a very large geographical area, covering states, countries, or even continents. It connects multiple LANs and MANs. The Internet is the largest example of a WA
N. Characteristics: Lower data transfer rates compared to LANs (historically), but covers vast distances, often uses public infrastructure (leased lines, satellite). Nigerian
Example:* Connecting bank branches across Nigeria, MTN's network connecting its operations across different states, or accessing websites hosted anywhere in the world via the internet.
PAN (Personal Area Network): Description: Connects devices within a very small personal workspace, typically within a few meters of a person.
Technology: Bluetooth, Infrared, US
B. Nigerian
Example:* Connecting a Bluetooth headset to a mobile phone, transferring files between a phone and a laptop using a USB cable, or using a phone's hotspot to connect other personal devices.
This topic has extensive real-life applications that directly impact Nigerian daily life, economy, and society.
Economic Growth and Business Operations: E-commerce: Nigerian businesses (e.g., Jumia, Konga) rely heavily on data networks (the internet) and information systems (for managing orders, inventory, payments – TPS, MIS) to operate and reach customers across the country. Mobile telephony (USSD banking) facilitates payments for many.
Banking: All Nigerian banks utilize sophisticated information systems (TPS for ATM/POS transactions, MIS for reporting, DSS for loan approvals) and robust data networks (WANs connecting branches, fiber optics for high-speed transactions) to provide services, making financial transactions efficient and secure.
Agriculture: Farmers in remote areas can receive weather forecasts, market prices, and agricultural advice via radio broadcasting, which helps them make informed decisions and improve yields.
Community Development and Public Services: Emergency Communication: Police, fire service, and emergency response teams often use specialized radio communication systems for immediate coordination during crises, which is vital for public safety in Nigerian communities.
Public Awareness: Government agencies use radio and television broadcasting (e.g., NTA, FRCN) to disseminate public health campaigns (e.g., polio eradication, COVID-19 advisories), election information, and security alerts to the general populace, including those in remote areas.
Education: ICT facilitates e-learning platforms, online research, and digital libraries. Data networks (LANs in schools, WANs for university internet access) are crucial for students and teachers to access educational resources globally.
Daily Life and Social Interaction: Personal Communication: Mobile telephony is ubiquitous in Nigeria, enabling individuals to stay connected with family and friends, conduct business, and access information on the go. Social media platforms (using internet/data networks) are key for networking and information sharing.
Entertainment: Nigerians consume a vast amount of entertainment through various broadcasting types – local radio stations for music, satellite TV for international and local movies, and internet broadcasting platforms like YouTube for streaming content.