Types of Multiplexing Techniques for Competitive Exams 2021

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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

Working of FDM


  • 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.
  • Working of FDM
    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

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