In Telecommunication, multiplexación is the two more combination of or information channels in a single Half of transmission using a called device Multiplexer . The inverse process is known like demultiplexación. A very similar concept is the one of Control of access to means .
Many strategies of multiplexación exist according to the used communication protocol, that can combine them to reach the most efficient use; the most used they are:
Multiplexación by time division or TDM ( Time division multiplexing );
When a scheme or thought protocol of multiplexación exists so that multiple users share common means, like for example in movable Telephony or WiFi, usually denominates Control of access to means or multiple access method. As multiple access methods emphasize:
This way, to transmit the channels of Television by air, we are going to have a width of Frequency x, which will be to multiplexar so that the greater possible amount of TV channels enters. Then the channels in a bandwidth of 6Mhz are divided (to a large extent of Europe and Latin America, whereas in other countries or regions the 8 bandwidth is of Mhz). In this case one is used Multiplexación by division of Frequency FDM .
Multiplexación in the protocols of the layer of transport in Model OSI
Multiplexar package of data, means to take data from application layer, to label them with number of port ( TCP or UDP ) that it identifies to the emitting application, and to send this package to the network layer.
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