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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.



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.



References in periodicals archive ?
Despite the difficulty of evaluating the efficiency of modern statistical multiplexers, most purchase decisions can be made very simple.
The 2080MX is a 4:1 multiplexer (mux) operating at rates up to 20 Gbps for use in SONET OC-192 applications, broadband test and measurement equipment, and telecom transmission systems.
Phillips is excited about the opportunity to represent the Charles Multiplexer product line," said Bobby Baine, V.
In an open-loop environment, the collective rate of all streams feeding into a multiplexer is greatly reduced.
The Mini-Mux 840 builds upon the extensive Charles multiplexer portfolio, which includes the Exchange Mux I (Transmux), Exchange Mux II (T1/E1 to T3, STS-1, AU3, AU4, OC-3 or STM-1), Mini-Mux 155 (T3 or STS-1 to OC-3 or STM-1), Mini-Mux 210 (E1 M13), and Mini-Mux 280 (T1 M13).
Aurora has also added a family of 5- and 10-wavelength CWDM optical multiplexers and demultiplexers to its outdoor optical passive offerings to complement the OP941S single wavelength outdoor filters.
The new devices are designed for a wide variety of applications including ADMs/OEDs, WAN aggregation routers, digital cross-connects, ATM switches, digital subscriber line access multiplexers (DSLAMs) and media gateways.
Mindspeed's highly integrated multiplexers, LIUs and OptiPHY physical-layer devices dramatically reduce our board-space requirements while providing the performance and software support we need to develop complex, configurable testing systems.
Siliconix is a leading manufacturer of power MOSFETs, power ICs, analog switches, and multiplexers for computers, cell phones, fixed communications networks, automobiles, and other consumer and industrial electronic systems.
The company is also enhancing its next-generation metro network offerings by adding highly integrated optical modules, including a 40 channel integrated PLC "Blocker" and monitored VOA multiplexers.