We need a translator who can translate Analog signals to Digital which computers can recognize, Digital to Analog signal which the telephone lines can carry. Modem is the translator here.
Thursday, April 14, 2011
Modem
A Modem (Modulator-Demodulator) is used to translate Analog signal to Digital signal and Digital to Analog signal.When the Internet started to spread all over the world, it is hard to lay separate cable for every one who needs internet, so to solve this problem existing telephone lines are used. But telephone lines are supposed to carry Analog signals to transmit our voice, whereas Computers can only recognize Digital signals.
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