RU2565061C2 - Screened combined symmetric four-pair cable of category 7 with screened optical modules of open type - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: in symmetric four-pair cable containing conductors in polymeric isolation with external polymeric shell, each pair is placed into metal-polymeric tape with the metal part facing outside with overlapping of edges along the whole length of the cable, and between the screened pairs the screened open optical modules with overlapping of edges are placed along the whole length of the cable metal outside with placement in their structure of the crosswise power element providing stiffness of the open module and containing optical fibres in each window of this module, meanwhile the symmetric screened pairs and open modules in one lay are twisted around the screened central optical module of the closed type with the metal part facing outside which is also strengthened by a crosswise strength element with optical fibres in each window of this module, and all screens of symmetric pairs and optical modules of open and close type are made from the metal-polymeric tape with metal part facing outside, providing contact with the drain conductor and applied above the lay of screened symmetric pairs and open optical modules of bimetallic tape, metal braid and external polymeric shell.

EFFECT: invention allows to reduce mutual influence between the pairs.

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Description

Technical field

The invention relates to the field of electrical engineering and can be used in the construction of symmetric communication cables on public networks and structured cable systems.

State of the art

A known design of a symmetric shielded four-pair cable containing copper conductors in polymer insulation twisted into a common core, each pair twisted with a step different from the steps of other pairs in the common screen and the polymer outer sheath (S / UTP) (in the book Structured cable systems, authors: A.B.Semenov, S.K. Strizhakov, I.R.Suncheley, DMK Publishing House, M., 2002, p. 109 Fig. 3.4 and 3.5).

Design disadvantage: significant mutual influence between pairs in the range above 100 MHz at a length of 100 meters.

Also known is the design of a shielded symmetric four-pair cable containing conductors in polymer insulation, each pair is placed on the screen of aluminum-polymer foil with the foil facing out and all shielded pairs are placed on the common screen of foil and braid, and the outer polymer sheath (S / STP) (ibid., p. 109, fig. 3.4 and 3.5).

The disadvantage of this design with a sufficiently high shielding effect is the difficult access to the cores of various cable pairs.

The well-known design of a symmetrical four-pair Category 6 cable for the range up to 250 MHz (Teldor 2006 prospectus, p. 23). The cable consists of 4 pairs twisted with different steps around a cross-shaped profile. The increase in the distance between the pairs and, consequently, the increase in the transitional attenuation between the pairs is achieved by introducing a cross-shaped polymer profile into the structure.

Design drawback: the cross-shaped dielectric profile and its dimensions provide insufficient improvement of the transmission characteristics, in particular the mutual influence between the pairs. A well-known design of a symmetrical four-pair cable, described in the prospectus of the company Teldor, Wires and Cables, Russia Ltd. 2002, 223 pages) Category 6 cable (250 MHz), unshielded (UTP). The cable contains conductors with a diameter of 0.575 mm with polyolefin insulation with an outer core diameter of 1.0 mm. Four pairs are twisted around a central cruciform profile. The outer diameter of the cable is 6.7 mm, the thickness of the outer sheath is 0.7 mm, the wall thickness between the pairs is 0.7 mm, and the diameter of the cable core is 5.3 mm.

The disadvantage of this design is the need to increase the distance between the pairs by increasing the thickness and size of the cross-shaped profile to reduce the mutual influence between the pairs and improve the transfer characteristics.

Known design described in the prospectus of Teldor 2006, www.teldor.com, teldor.russia@yahoo.com., P. 10 figure and p. 20 description. S / STP Category 7 cable (600 MHz) contains eight copper conductors insulated with a polyolefin, each pair wrapped in polyester aluminum foil with foil facing out with a coating density of 100%. All four pairs are twisted around a tinned copper drainage conductor with a diameter of 0.51 mm and placed in a common foil and braid shield and an external polymer shell.

The disadvantage of this design: difficult access to the veins of each pair with a high shielding ability and a small mutual influence between the pairs.

The closest in technical essence is the design of a symmetrical four-pair cable, described in patent No. 2422930 IPC, НВВ 11/00 Symmetric four-pair cable. Authors: Portnov E.L., Semenov A.B., Zubilevich A.L. A symmetric four-pair cable contains polymeric insulated conductors twisted in pairs with an external polymer sheath, every two pairs are placed in B-shaped modules, with each pair having one pair in each B-shaped window, the windows of each B-shaped module are directed in opposite directions and each of the B-shaped modules is made of perforated polymer tape, the ends of which are closed in the middle of the tape, creating windows of the same size along the entire length of the cable.

The disadvantage of this design is the significant mutual influence between the pairs in the high frequency range (up to 600 MHz). To reduce this effect, it is necessary to increase the thickness of the B-shape of the module to a significant size and still the problem will not be solved.

SUMMARY OF THE INVENTION

The task this technical solution is aimed at is the creation of such a design of a shielded symmetrical four-pair cable that can reduce the mutual influence between the pairs due to their shielding and relative position, the invariance of distances due to the use of shielded open optical modules as fixing elements and, therefore to reduce the mutual influence between them due to the presence of screens on all structural elements.

To solve this problem, in a symmetrical four-pair cable containing conductors in polymer insulation with an external polymer sheath, each pair is placed in a metal-polymer tape with the metal facing outward, with overlapping edges along the entire length of the cable, and shielded open optical modules with overlapping edges are placed between the shielded pairs the length of the cable metal to the outside with the placement in their design of a cross-shaped power element that provides the rigidity of the open module and containing about each window of this module about optical fibers, while symmetrical shielded pairs and open modules in one layer are twisted around a shielded central optical module of a closed type with metal outward, also reinforced with a cross-shaped power element with optical fibers in each window of this module, all screens of symmetric pairs and optical modules open and closed types are made of metal-polymer tape metal to the outside, providing contact with the drainage conductor and shielded symmetrical pairs laid on top of the layer and open optical modules of bimetallic tape, metal braid and the outer polymer shell.

List of figures

The invention is illustrated in figure 1, which shows the design of the shielded combined balanced four-pair cable category 7 with shielded optical modules of the open type.

The implementation of the invention

In this combined design of a screened combined symmetrical four-pair cable of category 7 with open-type shielded optical modules, containing conductors in polymer insulation - 1, twisted in pairs - 2, in the open type screen in a metal-polymer tape - 3 metal outward - 4, the central shielded optical module closed type - 5 metal outward - 6, shielded optical module - 7 metal outward - 8 with overlapping edges - 10, drainage conductor - 9. bimetal sheath - 11, metal opl it is 12, the outer polymer shell is 13, the screened optical modules are open - 7 and the closed type - 5 with a cross-shaped reinforcing element - 14, in the windows of which optical fibers are placed - 15 due to the relative position of the shielded pairs of the four-pair cable, the introduction of shielded open and closed optical modules made of metal-polymer tapes and placing each pair of twisted copper cores in polymer insulation, the presence of contact between metal-polymer tapes, a drainage conductor and a bimetallic tape With the help of a sheath and a braid, the effect between pairs in the frequency range up to 700 MHz is reduced and the overall material consumption of the cable is reduced. Shielded open modules with optical fibers enhance their rigidity due to the cross-shaped force elements, and the relative position of the modules relative to each other also leads to stability of the distance between symmetrical pairs and, consequently, to a decrease in the effect between them.

The thickness of the shielding metal-polymer tape of the modules and their contacts with the drain conductor and the bimetallic tape and the braid along the entire length of the cable also influence the reduction of the effect between the pairs.

Claims (1)

Shielded combined symmetrical four-pair cable of category 7 with open-type shielded optical modules, containing conductors in polymer insulation with an external polymer sheath, characterized in that each pair is placed in a metal-polymer tape with metal outward with overlapping edges along the entire length of the cable, and shielded are placed between the shielded pairs open optical modules with overlapping edges along the entire length of the cable metal to the outside with the placement of a cross-shaped power element in their structure, providing rigidity of the open module and containing optical fibers in each window of this module, symmetrical shielded pairs and open modules are twisted around the screened central optical module of the closed type with metal outward in one layer, also reinforced with a cross-shaped power element with optical fibers in each window of this module, moreover, all screens of symmetric pairs and optical modules of open and closed type are made of metal-polymer tape with metal facing outward, providing contact with a drain conductor and a shielded symmetrical pair and open optical modules of a bimetallic tape, a metal braid and an external polymer shell imposed on top of a layer.