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because internet that comes down a telephone line are analogue signals and the computer on understands digital signals ( 1 and 0s , Machine code, binary) so the modem translates the analogue signals from the phone line to digital and translates digital signals from the computer to analogue

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Q: Why is MODEM a necessary component of many data communication system?
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Related questions

What function does a modem provide in communication between computers?

FUNCTIONS OF MODEM


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