Multiplexing combines multiple analog or digital signals for transmission through a single communication line. It allows different types of data like photos, videos, and tweets to be sent over a single network line. There are three main types of multiplexing: frequency division multiplexing, time division multiplexing, and wavelength division multiplexing. De-multiplexing is the process of separating the individual signals at the receiving end by examining socket information and passing data to the correct application.

1. Multiplexing &
De-Multiplexing
Tania Sahito, BS(CS-V)
Sukkur IBA
Sukkur, Pakistan
11/14/2016

2. Think for a while, If you have data in
following formats
 Photos/Images
 Tweets
 Videos
How to send it on a single network line?
Though It is the responsibility of the Transport layer to send data to the
communication line but how???
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Tania Sahito(CS-Vs), Sukkur Institute of Business Administaration, Sukkur

3. Multiplexing
 Multiplexing combines multiple analog or digital signals bound for
transmission through a single communication line or computer
channel
 Multiplexer is used to perform multiplexing
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Tania Sahito(CS-Vs), Sukkur Institute of Business Administaration, Sukkur

4. Why to multiplex?
 To share an expensive resource.
 Reduces communication channels and saves cost
 Easy management such is tracking the line
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Tania Sahito(CS-Vs), Sukkur Institute of Business Administaration, Sukkur

5. Types of Multiplexing
 Frequency Division Multiplexing(FDM)
 Time Division Multiplexing(TDM)
 Wavelength Division Multiplexing(WDM)
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Tania Sahito(CS-Vs), Sukkur Institute of Business Administaration, Sukkur

6. Frequency Division Multiplexing
 FDM assigns a discrete carrier frequency to each data stream and then
combines many modulated carrier frequencies for transmission. (it is done
repeatedly)
 For example, television transmitters use FDM to broadcast several channels
at once.
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Tania Sahito(CS-Vs), Sukkur Institute of Business Administaration, Sukkur

7. Time Division Multiplexing
 Time Division Multiplexing combines data streams by assigning each stream
a different time slot in a set. TDM repeatedly transmits a fixed sequence of
time slots over a single transmission channel.
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Tania Sahito(CS-Vs), Sukkur Institute of Business Administaration, Sukkur

8. Wavelength Division Multiplexing
 WDM modulates each of several data streams onto a different part of
the light spectrum.
 It is used in fiber optics(Equivalent of FDM)
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Tania Sahito(CS-Vs), Sukkur Institute of Business Administaration, Sukkur

9. De-Multiplexing
 At the receiver's side, the transport layer gathers the data, examines its
socket and passes the data to the correct Application. This is known as De-
Multiplexing..
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Tania Sahito(CS-Vs), Sukkur Institute of Business Administaration, Sukkur

10. 11/14/2016Tania Sahito(CS-Vs), Sukkur Institute of Business Administaration, Sukkur
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