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Multiplexing is a technique for sending more than one information signal at a time down a single communication path(e.g. medium, circuit or channel). Multiplexing is sometimes loosely referred to as MANY into ONE.

The multiplexed signal is transmitted over a communication channel, which may be a physical transmission medium. The multiplexing divides the capacity of the low-level communication channel into several higher-level logical channels, one for each message signal or data stream to be transferred. A reverse process, known as demultiplexing, can extract the original channels on the receiver side.

A device that performs the multiplexing is called a multiplexer (MUX), and a device that performs the reverse process is called a demultiplexer (DEMUX).

Multiplexing can be achieved in a number of ways. The following three will be covered in this class:

1. Space Division Multiplexing
2. Frequency Division Multiplexing
3. Time Division Multiplexing
4. Code division multiplexing.

Multiplexing-Lecture Video:

Multiplexing - Presentation: