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 );

  • Multiplexación by division of frequency or FDM ( Frequency-division multiplexing ) and its equivalent for average optician, by division of or wavelength WDM (of Wavelength );
  • the multiplexación by division in code or CDM ( Code 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:

Multiplexación in computer science

In Computer science and electronics, the multiplexación talks about the same concept if bus of data is that there is to share between several devices (discs, memory, etc. Another type of multiplexación in computer science is the one of CPU, in which to Process is assigned Quantum to him of time during which it can execute his instructions, before yielding the site to another process that is waiting for in tail of ready processes to being dispatched by planning of processes . In also computer science, is denominated to multiplexar to combine in same file container, several tracks of two archives, for example of Audio and Video, for its correct reproduction….

Multiplexación in telecommunications

In Telecommunications is used Multiplexación to divide the signals in the means by which they are going to travel within the Radioelectric phantom . The term is equivalent to Control of access to means .

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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