What is multiplexing ? Explain synchronous time division multiplexing technique.
Subject Data Communication
NU Year Set: 3.(a) Marks: 6 Year: 2012 Set: 4.(b) Marks: 6 Year: 2013

Multiplexing is a popular networking technique that integrates multiple analog and digital signals into a signal transmitted over a shared medium. Multiplexers and de-multiplexers are used to convert multiple signals into one signal. 

Time-division multiplexing (TDM) is a technique that allows a link to be ‘sectioned’ in time slots, so different signals can be transmitted almost simultaneously using the same link. This method puts multiple data streams in a single signal by separating the signal into many segments, each having a very short duration. Each individual data stream is reassembled at the receiving end based on the timing.

Synchronous TDM, as a way of implementing TDM, works by the multiplexor giving exactly the same amount of time to each device connected to it. This time slice is allocated even if a device has nothing to transmit. This is wasteful in that there will be many times when allocated time slots are not being used. Therefore, the use of Synchronous TDM does not guarantee maximum line usage and efficiency. In asynchronous TDM, the timeslots are not fixed. They are assigned dynamically as needed.

Multiplexing (or muxing) is a way of sending multiple signals or streams of information over a communications link at the same time in the form of a single, complex signal; the receiver recovers the separate signals, a process called demultiplexing.
Time-division multiplexing (TDM) is a technique that allows a link to be ‘sectioned’ in time slots, so different signals can be transmitted almost simultaneously using the same link. This method puts multiple data streams in a single signal by separating the signal into many segments, each having a very short duration. Each individual data stream is reassembled at the receiving end based on the timing.
Synchronous TDM, as a way of implementing TDM, works by the multiplexor giving exactly the same amount of time to each device connected to it. This time slice is allocated even if a device has nothing to transmit. This is wasteful in that there will be many times when allocated time slots are not being used. Therefore, the use of Synchronous TDM does not guarantee maximum line usage and efficiency. In asynchronous TDM, the timeslots are not fixed. They are assigned dynamically as needed.


Multiplexing (or muxing) is a way of sending multiple signals or streams of information over a communications link at the same time in the form of a single, complex signal; the receiver recovers the separate signals, a process called demultiplexing.
Time-division multiplexing (TDM) is a technique that allows a link to be ‘sectioned’ in time slots, so different signals can be transmitted almost simultaneously using the same link. This method puts multiple data streams in a single signal by separating the signal into many segments, each having a very short duration. Each individual data stream is reassembled at the receiving end based on the timing.
Synchronous TDM, as a way of implementing TDM, works by the multiplexor giving exactly the same amount of time to each device connected to it. This time slice is allocated even if a device has nothing to transmit. This is wasteful in that there will be many times when allocated time slots are not being used. Therefore, the use of Synchronous TDM does not guarantee maximum line usage and efficiency. In asynchronous TDM, the timeslots are not fixed. They are assigned dynamically as needed.


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Fahim Ahmed on 6 months ago

Three answers are same. So why need to upload it three times ?