Functions and Features of Communication Devices - JSS3 Basic technology Lesson Note

1. Telephones:

• Functions: Telephones convert sound into electrical signals and transmit these signals over a distance. They allow for real-time voice communication.
• Features: Dialling keypad, receiver, ringer, speaker, and microphone. Modern telephones may include caller ID, voicemail, and call forwarding.

2. Mobile Phones:

• Functions: Mobile phones enable voice calls, text messaging, internet access, and multimedia sharing. They operate on cellular networks.
• Features: Touchscreen, camera, apps, GPS, internet connectivity, and storage for contacts and media. Smartphones have advanced operating systems and support for various applications.

3. Fax Machines:

• Functions: Fax machines send and receive scanned documents over telephone lines. They convert documents into electronic signals for transmission and then back into printed form.
• Features: Scanner, modem, printer, and memory storage. Some fax machines include email functionality and document feeders for multiple pages.

4. Computers:

• Functions: Computers process, store, and transmit data. They support various communication applications like email, video conferencing, and instant messaging.
• Features: Keyboard, mouse, monitor, storage, and internet connectivity. Computers can run multiple programs and support various multimedia functionalities.