Trunk Cables

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 It might be outdated or ideologically biased.

Trunk Cables


communications cables laid between cities or other large populated areas.

Trunk cables are mainly of the high-frequency type and may be balanced or coaxial. A 60-channel system with a frequency band from 12 to 252 kilohertz is most commonly used for multi channel communication with balanced cable; coaxial cable multiplexes 960, 1,800, 1,920, 2,700, or 3,600 telephone channels. In the last case, the frequency band is up to 20 megahertz.

Most trunk cables are of the composite type, consisting of coaxial pairs of standard size, as well as balanced pairs or spiral quads. The latter type is used for service traffic and remote monitoring and control.

The current conductors of balanced cables are made of copper and have a diameter of 1.1, 1.2, or 1.3 mm. They are insulated by foamed or solid polyethylene, corded polystyrene, corded polyethylene, or corded paper. (In corded insulators, a cord of the insulating material is wound in a spiral around the conductor.) The insulated conductors are twisted into four, seven, or 12 spiral quads.

Coaxial cables contain four, six, eight, 12, or as many as 20 coaxial pairs. Two sizes of coaxial pairs have been standardized internationally: medium-gauge (normalized), or 2.6/9.5, and small-gauge, or 1.2/4.4. The national standards and specifications of various countries provide for coaxial pairs of 0.9/3.2, 1.2/4.6, 1.55/5.6, 2.1/9.4, and 6.85/24.75. The pairs have beaded or envelope-type air-polyethylene insulation. The inner conductor is a single copper wire; the outer conductor is a tube made from copper strip wound longitudinally.

Historically, trunk cables are also considered to include uniform or composite low-frequency balanced cables, with a copper conductor diameter of 0.8-1.6 mm and as many as several hundred spiral or multiple-twin pairs. These cables are used mainly as inserts in overhead communications lines where water barriers (rivers or lakes) must be crossed, and also in mountain passes and tunnels; for lead-ins to telephone exchange buildings; and for connections between automatic exchanges, including their connections with a trunk exchange.


Kuleshov, V. N. Mezhdugorodnye kabeVnye Unit sviazi. Moscow, 1959. Shvartsman, V. O. KabeVnye vstavki v vozdushnye linii sviazi. Moscow, 1960.
Baron, D. A. Mezhdugorodnye kabeVnye linii sviazi. Moscow, 1969.
Grodnev, I. I., and P. A. Frolov. Koaksial’nye kabeli sviazi. Moscow, 1970.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Karnataka, May 22 -- Swiss cabling specialist R&M, a leader in quality structured cabling solutions, has randomly selected eleven MTP(R) OM4 Trunk cables to do a link test over a distance of 675 meters.
phone calls and tapping by GCHQ into fiber optic trunk cables carrying Internet traffic.
R&M's new range for data centres consists of Type S MTP modules, MTP adapter plates, HD panels, MTP trunk cables and patch cords.
Molex Incorporated offers a complete line of Brad modular power solutions featuring rugged, moulded trunk cables for feeder circuits up to 30-A, 600-V AC/DC and moulded drop cables for branch power distribution circuits up to 15-A, 600-V AC-DC.
Factory-terminated and-tested distribution trunk cables, tethers and harnesses enable quick, reliable installation, and each TAP supports up to two tethers (24 fibers) per location for added flexibility.
The flexible, multi-conductor, low capacitance trunk cables are double shielded to reduce EMI-EMF triboelectric noise and are available in various lengths to meet customer requirements.
Electro Standards Laboratories (ESL) (Cranston, RI) has designed hundreds of custom fiber optic data network cables to meet exact specifications, including ultra high density fiber optic ribbon and trunk cables as well as custom octopus cables connecting data communication equipment with routers and bridges.
The Greenland Connect network will consist of two main sections, or trunk cables, the first one spanning 2,500 kilometres from Nuuk in Greenland to Milton in Newfoundland.
The fiber-optic trunk cables service the main building
have 12-fibre trunk cables, we have eight-fibre trunk cables, and 16-fibre