The word ‘modem’ is a contraction of MOdulator/DEModulator. A modem connects digital equipment to a speech bandwidth-limited communications channel. Typically, they are used on telephone lines which have a bandwidth of between 400 Hz and 3.4 kHz. If digital pulses were applied directly these lines they would end up severely distorted.
KeywordsTelephone Line Digital Modulation Baud Rate Command Mode Return Code
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