Communications Circuit

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Communications Circuit


(Russian trakt sviazi), a complex of equipment and communication lines designed to establish specialized channels for the transmission of information. Communications circuits are characterized by specific, standard criteria, such as the frequency bandwidth and information transmission rate.

In Russian the concept of a communications circuit is often used in describing multichannel communications systems. For example, in multichannel systems with frequency-division multiplexing, standard voice-frequency channels are combined by means of carrier terminal equipment into standard 12-channel groups that occupy a standard frequency band of 60–108 kilo-hertz (the primary group circuit). The standard secondary group of channels occupies the frequency band 312–552 kilohertz (the secondary group circuit) and is formed by combining five standard primary groups. Additional groups of channels are formed in the same way. The set of all channel groups in a multichannel system constitutes a group, or multichannel, communications circuit, which may be characterized by the system’s total frequency bandwidth.

The standard criterion used for data-transmission systems is the information transmission rate. Data-transmission circuits are classified as low-speed (50 to 200–300 bits/sec), medium-speed (600–10,000 bits/sec), and high-speed (48,000 bits/sec and higher) circuits. A data-transmission circuit consists of several standard channels, data-transmission equipment, including such signal-conversion equipment as modulators and demodulators (modems), channel-monitoring equipment, and error-protection equipment. In addition to their use in multichannel communication and data transmission, standard communications circuits are also found in television, audio-broadcasting, broadband, and video-telephone communications.

In Russian the concept of a communications circuit is sometimes used in a narrower sense to designate the antenna/waveguide channel of a radio-relay link, a group channel in pulse-code modulation equipment, or the linear channel of multiplexing systems.


Mnogokanal’naia sviaz’. Edited by I. A. Abolits. Moscow, 1971.
Shvartsman, V. O., and D. G. Mikhalev. Raschet nadezhnostnykh kharakleristik traktovperedachi dannykh. Moscow, 1975.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
They are exploring, among other things, millimeter-wave technology and working on the further evolution of orthogonal frequency-division multiplexing (OFDM), a method of encoding digital data on multiple carrier frequencies, and multiple antenna MIMO technology, which combines multiple antennas at each end of the communications circuit to minimize errors and optimize data speeds.
The antennaes at each end of the communications circuit are combined to minimise errors and optimise data speed."
The antennas at each end of the communications circuit are combined to minimise errors and optimise data speed.
The clearest example of this, and a model that will play a central role in the discussion later in this article of the danse macabre depiction of a printing press, is Robert Darnton's well-known "communications circuit," which he describes as a "general model for analyzing the way books come into being and spread through society." (10) Darnton's communications circuit includes all of the attributes of a model identified by McCarty.
JDSU, Milpitas, Calif.,has introduced new Datacom and Diphase test features for its T-BERD/MTS-6000A Multi-Services Application Module (MSAM) for faster data communications circuit installment and troubleshooting.
In order for blade servers to achieve superior performance, technologies to enable the backplane - which is a communications circuit board connecting multiple server blades - to achieve high-speed transmissions of 10Gbps, and technologies to accelerate those transmissions through multiple channels are being developed.
King models his study on Robert Darnton's "communications circuit," which shows the interlinking interests of.
Chapter 3 begins with Darnton's well-known and frequently reproduced "communications circuit." It is 25 years old now, and has been modified and criticised by others, but remains the starting point from which new students of the discipline enter the field.
A key benefit of Astrolink is dynamic bandwidth allocation, which allows customers to purchase as much or as little satellite throughput capacity as they require at a given time, instead of paying for a dedicated communications circuit. Currently, communications satellite users must pay for dedicated transponded circuits, whether they are used or not.
Bandwidth is a measure of a communications circuit's carrying capacity.
In this system, the transmitter converts the measured value into a tone of fixed frequency, amplifies it, modulates a carrier frequency, and transmits it over the communications circuit. The receiver is equipped with electronic circuits that will detect that particular frequency and through interposing relays will translate the signal into the proper control function.

Full browser ?