Multiplexers
A multiplexer
combines more than one input into a single output. The
multiplexer or mux combines several electrical signals into a single signal.
There are different types of multiplexers for analog and digital circuits.
In digital signal processing, the multiplexer (often abbreviated to mux or
muldex) takes several separate digital data streams and combines them together
into one data stream of a higher data rate. This allows multiple data streams to
be carried from one place to another over one physical link, which saves cost.
At the receiving end of the data link a complementary demultiplexer or demux is
normally required to break the high data rate stream back down into the original
lower rate streams. In some cases, the far end system may have more
functionality than a simple demultiplexer and so, whilst the demultiplexing
still exists logically, it may never actually happen physically. This would be
typical where a multiplexer serves a number of IP network users and then feeds
directly into a router which immediately reads the content of the entire link
into its routing processor and then does the demultiplexing in memory from where
it will be converted directly into IP packets.
It is usual to combine a multiplexer and a demultiplexer together into one piece
of equipment and simply refer to the whole thing as a "multiplexer". Both pieces
of equipment are needed at both ends of a transmission link because most
communications systems transmit in both directions.
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from the following manufacturers, and more...
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