1. Modems(modulation demodulation)
A telephone line B
Modem modem
Digital signal analog signal
OR
Computer Modem Computer Modem
Data transmission Using a Modem
- To communicate between computers via telephone line, there is a need to convert
signals from the computer into a form suitable for transmission over the telephone
line or convert from digital signals into analogue signals, and convert back from
analogue signals to digital signals
- From source: digitals signals are converted into analogue signals(modulation)
- At the received end analogue signals are converted back into digital signals
(demodulation)
- A device to handle modulation, demodulation process is called Modem
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