Why Use Multiplexing & Multiplexer Examples

Multiplexing describe itself  that multiple signals are combined into one signal over a single data stream (like wire). The question is why we use multiplexing, the technique reduce number of  channels of electrical connections for the transmission of multiple signals.

Purpose of Multiplexing:

The purpose of multiplexing is we utilize a single data stream line and use it to transmit multiple signals. It saves our cost as well provide the utilization of our resources.

Is Multiplexing Costly?


  • Multiplexing reduce the cost of individual independent interconnections.
  • You have to pay for single wire(for transmission).


Multiplexing Examples:


Example 1:

Cable TV operator provides all TV channels via single cable or wire which is the best example of multiplexing. Without a multiplexer(Mux), there will be a separate cable for each channel you watch.

Example 2:

In telecommunications, several phone calls may be transferred using one wire. Else, you can imagine what would be the scenario if it wasn’t there.

Types of Multiplexing:

There are three basic multiplexing techniques listed below.

  1. Frequency division multiplexing (FDM)
  2. Wavelength division multiplexing (WDM)
  3. Time division multiplexing (TDM)
    - Synchronous time division multiplexing
    - Statistical time division multiplexing

1. Frequency division multiplexing

This technique use for analog signal conversion and it's abbreviation is called as FDM.

2. Wavelength division multiplexing

This technique use for analog signal conversion and it's abbreviation is called as WDM.

3. Time division multiplexing

This technique use for digital signal conversion, which is most reliable and famous technique. It's abbreviation is called as TDM.

TDM divided into 2 further categories Synchronous time division multiplexing and Statistical time division multiplexing

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