What Is a Multiplexer In Networking?
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A multiplexer is a network device that combines multiple signals into a single output. It allows for multiple data streams (or channels) to be transmitted over one medium, such as a fiber–optic cable. Multiplexers are used in applications where the number of output channels exceeds the number of input channels, and they are also used in applications where multiple channels need to be combined into a single output. Some common examples of multiplexers include time–division multiplexers (TDM), frequency–division multiplexers (FDM), and wavelength–division multiplexers (WDM).