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A device for combining two or more signals, as for multiplex, or for creating the composite color video signal from its components in color television. Also spelled multiplexor.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



in telegraphy, a switching device that is used to reduce the number of telegraph transmitters in a telegraph office as compared with the number of incoming communication lines. A distinction is made between manual and automatic multiplexers. They are used on lightly loaded lines, where the daily traffic does not exceed 30-80 telegrams.

The main element of a multiplexer is a switch, whose handle may be set in three positions: the horizontal (off) position; the upper position, which connects one telegraph transmitter to a communications line; and the lower position, which connects the other telegraph transmitter. The number of switches in a multiplexer is equal to the number of communications lines. Each switch is connected to its own communications lines, and all switches are connected to two telegraph transmitter stations for receiving and transmitting telegrams through the lines.

Upon receiving a call signal from the city communications office, the telegraph operator moves the handle of the switch located under the lighted signal to, for example, the upper position (thus connecting the first of two telegraph transmitter stations). If a call is received from another city communications office while the first transmitter station is still in operation, the telegraph operator moves the handle of the appropriate switch to lower position, thus connecting the second station. After completion of transmission or reception of a telegram the switches of the multiplexer are moved to the horizontal position.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


This article is provided by FOLDOC - Free Online Dictionary of Computing (


Transmitting several signals over a single communications line or computer channel. The two common techniques are frequency division multiplexing (see FDM), which separates signals by modulating the data onto different carrier frequencies, and time division multiplexing (see TDM), which separates signals by interleaving bits one after the other. See modulation, carrier, subcarrier, FDMA and TDMA.


In communications, a device that merges several low-speed signals into one high-speed transmission and vice versa. See multiplexing and inverse multiplexor.
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References in periodicals archive ?
The obtained waveforms show that the addition of R does not affect the demux operation.
As the voltage V(R) at the resistance node is directly applied to the gate of the output transistor, I have investigated the role that may have the sizing of the series transistors on the output gate transistor and then on the demux response, with and without addition of R.
200G DWDM Mux Demux comes with configurations of 2, 4, 8, 16 channels which are available in standalone 19" or 23" 1RU rack mount, 1RU or 2RU LGX module and Field module ABS box.
Customized 200G DWDM Mux Demux modules come in different packages including 1RU Rack Mount Chassis, 1U to 4U LGX box and outdoor use ABS plastic box, different connector types and DWDM wavelength is also selectable to meet customers' special needs.
In addition, to support high-accuracy measurement of semiconductor characteristics, the MP1862A DEMUX has high input sensitivity of 35 mVp-p (typical, single-ended, eye height).
For example, the typical digital set-top box architecture can be divided into three functions: channel decode (tuner/demodulation/forward error correction [FEC]), source decode (demux and decode the content MPEG, audio, VoIP, JPEG, and data), and distribution to the display, speakers, PDA, PC, or storage medium (Figure 2).
The source decoder demuxes the content, which can be video, audio or data, and routes it to the appropriate decode block.