Theory question 101
Information TransmissionPaper 2, Section A: Essay
(a) What is teleconferencing? (b) State four uses of Automated Teller Machine (ATM). (c)(i) Give the function of a modem. (ii) List the two means of transmitting information.
Show the model answer
(a) Teleconferencing is holding a live meeting between people in different places using telecommunication (telephone, video or internet links).
(b) Any four: withdrawing cash; checking account balance; transferring money; buying airtime/recharge; paying bills (electricity, DSTV); printing mini statements; changing PIN; depositing cash (some ATMs).
(c)(i) A modem converts (modulates) digital signals from the computer into analogue signals for the telephone line and converts (demodulates) them back at the other end.
(ii) Wired (guided) and wireless (unguided) transmission (or: ancient/traditional means and modern/electronic means).
Modem = modulator-demodulator; say both directions.