|Mus.Cat. NEWUC:2010.17||Mnfctr: Racal-Milgo ltd||Date: 1974||Ref No: MG/002||Ser No: -|
|Comp: Manual||Width: 208 mm||Depth: 1 mm||Height: 298 mm||Weight: 37 g|
The following is taken from the above manual.
A Modem - what it does and why
A modem is a device which enables digital equipment such as data terminals and computers to be connected via Post Office telephone lines which were originally intended for voice communication only. Basically a modem consists of two independant parts:-
(1) MODULATOR - this converts the DTE digital signal into audio signals for transmission over telephone lines.
(2) DEMODULATOR - this reconstructs the original digital signal from thr audio signals transmitted by the remote modulator.
Thus the word MODEM derives from the two sections of the device - the MODulator and the DEModulator.