(a)What is teleconferencing? (b) State four uses of automated Teller Machine (ATM) (c)(i) Give the function of a modem (ii) List two means of transmitting i...

This question tests teleconferencing, ATM uses, the modem and transmission means.

(a) Teleconferencing. Teleconferencing is the use of telecommunication and computer technology to hold a meeting or conversation between two or more people in different locations at the same time, using audio and/or video links so they can see and/or hear one another.

(b) Four uses of the Automated Teller Machine (ATM).

• Withdrawing cash.
• Checking account balance.
• Transferring funds between accounts.
• Paying bills / buying airtime (also PIN change and mini statement).

(c)(i) Function of a modem. A modem (modulator-demodulator) converts the computer's digital signals into analog signals for transmission over a communication line (modulation) and converts incoming analog signals back into digital form (demodulation), so that computers can communicate over telephone or similar lines.

(c)(ii) Two means of transmitting information. Through guided/wired media such as cable (twisted-pair, coaxial or fibre-optic) and through unguided/wireless media such as radio waves, microwaves or satellite.

Examination reminder: remember the modem does two opposite jobs - modulation (digital to analog) when sending and demodulation (analog to digital) when receiving.