multiplexer

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multiplexer

[′məl·tə‚plek·sər]
(electronics)
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 It might be outdated or ideologically biased.

Multiplexer

 

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.

V. V. NOVIKOV

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

multiplexer

This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

multiplexing

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.

multiplexor

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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