Types of Multiplexing Techniques for ICAR NET 2020

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Types of Multiplexing Techniques: FDM WDM and TDM (Computer Science)


FDM (Frequency Division Multiplexing)

WDM( Wavelength Division Multiplexing)

TDM (Time Division Multiplexing)

a. Synchronuous TDM

b. Asynchronuous TDM

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  • FDM stand for Frequency Division Multiplexing Technique.

  • In FDM, different frequencies will be combined as the one frequency and transmitted in the channel and at the receiver end again it will be separated as it was.

  • It is totally based upon the frequency combining and division

Working of FDM

Image of Working of FDM

Image of Working of FDM

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  • WDM stands for wavelength Division Multiplexing Technique.

  • It multiplexes the optical carrier signals into a single optical fibre signal and transmit it further to the channel.

  • It is widely used in SONET (Synchronous Optical Network) with high efficiency.

  • Image of Working of FDM

    Image of Working of FDM

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The best example of WDM is prism through which lights gets scattered into multiple colours.

Working of WDM


  • It stands for Time Division Multiplexing Technique of Multiplexing.

  • Each frame or packet of data will be allotted the time slot.

  • It transmits the digital signals over the transmission network.

  • It is used for high speed transmission

  • It can be of two types:

  • Synchronous TDM (with common clock signal sharing)

  • Asynchronous TDM (without sharing common clock)


Q1. Which type of multiplexing technique is used in SONET?


A. Asynchronous TDM



D. Synchronous TDM

Answer: C

Q2. SONET is:


  1. Synchronous Optical Network

  2. Simultaneous Optical Network

  3. Synchronous Optimized Network

  4. Structural Optical Network

Answer: A

  • We learnt about:

#Frequency Division Multiplexing

# Wavelength Division Multiplexing

# Time Division Multiplexing

# Synchronous Time Division Multiplexing

# Asynchronous Time Division Multiplexing