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Which of the following devices is used for modulation & demodulation


1. Multiplexer
2. Serial port
3. Modem
4. Gate way

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Correct Answer - Option 3 : Modem

MODEM:

  • Modem stands for Modulator-demodulator.
  • It converts the analog signals from the transmission wires into digital signals which can be read by the computer devices (modulation).
  • Then conversion of digital signal into analog and extracting out the useful information (demodulation) takes place.

Multiplexers:

  • A multiplexer is a combinational circuit.
  • A multiplexer is Many to one data selector.
  • A multiplexer selects one of the many data available at its input depending on the bits on the select line.
  • For 2n inputs, there are n select lines that determine, which input is to be connected to the output.

 

GatewayA gateway is networking hardware used in telecommunications for telecommunications networks that allows data to flow from one discrete network to another.

Serial PortAn asynchronous port on the computer used to connect a serial device to the computer and capable of transmitting one bit at a time.

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