Application areas of ICT

The Public Switched Telephone Network is simply the traditional telephone system that connects homes and offices through physical copper wires and switching centres. Think of it as a massive network where your phone call gets routed through various exchanges until it reaches the person you're calling. Nigeria's PSTN is managed by telecommunications companies like MTN and Airtel, who maintain the infrastructure of telephone lines across the country.

When you dial a number, your call travels from your phone through local exchanges to regional switching centres, then finally to the recipient's phone. This system has been around for decades and forms the backbone of voice communication. Although mobile networks have become popular, PSTN still serves homes and offices, especially for long-distance calls and fax transmissions.

Mobile phone systems are networks that allow people to communicate wirelessly through devices that transmit signals to cell towers. These towers receive your call or message and route it to the recipient's phone, regardless of location. The technology operates through frequencies assigned by regulatory bodies and requires infrastructure like base stations, switching centres, and satellites.

Nigeria's telecommunications landscape demonstrates this perfectly. MTN Nigeria, Airtel, Glo Mobile, and 9mobile all operate mobile phone networks covering millions of Nigerians daily. When you call someone in Lagos from Abuja, your voice travels wirelessly to the nearest cell tower, through the network's switches, then to the recipient's phone.

Modern mobile systems enable voice calls, text messaging, data transfer, and internet access. They've revolutionised how Nigerians conduct business, access education, and stay connected socially.

A circuit switched packet telephone system combines two ways of sending information through networks. Circuit switching creates a dedicated path between two people making a call, like a direct telephone line that stays open from start to finish. Packet switching breaks messages into small pieces called packets that travel separately through different routes before reassembling at the destination.

When you make a voice call on most Nigerian networks like MTN or Airtel, your voice travels as packets across their networks, but the system manages it like a circuit connection to ensure smooth, continuous conversation. This hybrid approach gives you reliable phone calls while efficiently using network resources.

The system works by establishing a connection path, sending your voice data as packets along that path, and maintaining quality throughout your call. This technology is essential for modern telecommunications in Nigeria.

Teleconferencing is when people in different locations meet and communicate together using technology, as if they're in the same room. Instead of traveling to a physical meeting place, participants use computers, cameras, microphones, and internet connection to see and hear each other in real-time. This saves time, money, and energy that would be spent on transportation.

In Nigeria, many companies like banks and tech firms use teleconferencing for staff meetings and training sessions, especially after the COVID-19 pandemic made it necessary. Universities also conduct virtual lectures through platforms like Zoom and Google Meet. The technology allows face-to-face interaction without people being physically present together, making communication faster and more efficient for businesses across the country.

Video conferencing is a technology that allows people in different locations to see and talk to each other in real-time using cameras, microphones, and internet connection. It's like having a face-to-face meeting without being in the same room. You can see the other person's face on your screen, hear them clearly, and even share documents or presentations during the conversation.

During the COVID-19 pandemic, many Nigerian schools and universities used video conferencing platforms like Zoom and Google Meet to continue teaching when students stayed at home. Teachers could deliver lessons while seeing their students' faces, and students could ask questions just like in a physical classroom.

Video conferencing saves time and money because people don't need to travel. It's used in business meetings, medical consultations, job interviews, and online education.

Telecommuting simply means working from home or any location outside the office using internet and computer technology. Instead of going to a physical workplace daily, employees complete their tasks remotely through email, video calls, and online collaboration tools. This arrangement saves time on transportation and allows flexible working hours.

Many Nigerian companies, especially those in Lagos like tech startups and call centres, now offer telecommuting options to their staff. Workers can attend meetings via Zoom, submit reports online, and communicate with colleagues from their homes. The COVID-19 pandemic accelerated this practice in Nigeria when many organizations had to adapt quickly.

Benefits include reduced stress from commuting in Lagos traffic, lower transportation costs, and improved work-life balance. However, telecommuting requires stable internet connection and self-discipline to stay productive away from office supervision.

Telecomputing simply means working or conducting business from a distance using computers and internet connection. Instead of physically going to an office, you use your computer to connect with colleagues, access files, and complete tasks from anywhere — your home, a café, or while traveling.

Think of it this way: a Nigerian software developer in Lagos can work for a company based in Europe without leaving home. They attend meetings via video call, submit code through cloud platforms, and communicate with their team through email and messaging apps. This is telecomputing in action.

The main advantages include saving time and transport money, increased flexibility, and access to global job opportunities. During the COVID-19 pandemic, many Nigerian banks and organizations forced their staff to work from home using telecomputing tools like Zoom and Microsoft Teams.

Information search, retrieval and archival simply means finding, getting back and storing data for future use. When you search something on Google, that's information search. When you access old emails in your Gmail account, that's retrieval. Archival is keeping important documents safe for many years.

In Nigeria, the National Archives in Ibadan stores historical documents, photographs and records going back decades. They use ICT systems to organize, protect and help researchers find specific information quickly. Without proper archival systems, valuable documents would get lost or damaged.

Today, banks use ICT to retrieve customer transaction records instantly, hospitals keep patient medical histories digitally, and schools store student records electronically. These systems make information accessible when needed while protecting it from damage.