Abstract:
Modem is a device which converts
digital signals to audio frequency tones
and vice versa. The frequency of these
signals is within the frequency range of
telephone lines. Through telephone
lines, these signals are transmitted and
then converted back to digital
information. The term ‘MODEM’ is a
contraction of modulator-demodulator.
Modems allow two computers/terminals
to communicate and to send serial data
over long distance using telephone line
i.e. they are basically used as interface
between the telephone lines and the
computer for transmitting and receiving
datas. They are therefore being called
as Data Modems also. Early nineties low
speed modems with data rate of 2400/
4800 bps were being used.
