RU2572827C2 - 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 comprised of cable cores in polymer insulation with outer polymer shell each pair is placed into a metallopolymeric band with metal facing outside and overlapped edges along the whole cable length, and between screened pairs there are screened optical modules of open type with overlapped edges along the whole cable length and metal facing outside and placement of cross-shaped power element in their structure, moreover the above module contains optic fibre in each slot, at that symmetric screened pairs and open modules in the same layer are twisted around the central screened optic module of closed type, with metal facing outside, reinforced with cross-shaped power element with optic fibre in each slot of this module. All screens of symmetric pairs and optical modules of open and closed type are made of metallopolymeric band, with metal facing outside, thus ensuring contact with drain conductor and bimetal band laid on top of the layer of symmetric pairs and open optical modules, metal braid and outer polymer shell.

EFFECT: reducing mutual influence between 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 for public networks and structured cable systems.

State of the art

A known design of a symmetrical 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 polymer outer sheath (S / UTP) (in the book "Structured cable systems ", Authors: A.B. Semenov, S.K. Strizhakov, I.R. Sunchely, 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) (in the book " Structured cable systems ”, authors: AB Semenov, SK Strizhakov, IR Suncheley, DMK Publishing House, M., 2002, 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 disadvantage: 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 pp.) 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 pairs of 0.7 mm, 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, http://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, each insulated with a polyolefin, each pair wrapped in polyester aluminum foil with a 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 high shielding ability and low mutual influence between the pairs.

The closest in technical essence is the design of a symmetric four-pair cable described in the patent of the Russian Federation, IPC Н01В 11/00, No. 2422930: "Symmetric four-pair cable", according to which the four-pair cable contains conductors in polymer insulation, twisted in pairs, with an external polymer sheath, every two pairs are placed in B-shaped modules, with one pair placed in each window of the B-shaped module, the windows of each B-shaped module are directed in opposite directions, and each of the B-shaped modules is made of perforated polymer Tapes, 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 significant sizes, 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 metal facing outward with overlapping edges along the entire cable length, and shielded open optical modules with overlapping edges along the entire length are placed between shielded pairs metal cable to the outside with the placement in their design of a cross-shaped force element that provides rigidity to the open module and containing in each window of this module about fibers, while symmetrical shielded pairs and open modules in one form are twisted around a shielded central optical module of a closed type with metal to the outside, 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 of the type are made of metal-polymer tape with the metal outward, providing contact with the drainage conductor and the shielded symmetrical pairs laid on top of them and open optical modules of a bimetallic tape, a metal braid and an external polymer shell.

List of figures

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

The implementation of the invention

In this combined design of category 7 shielded combined four-pair symmetric cable with open-type shielded optical modules containing polymeric insulation conductors 1 twisted in pairs 2, in an open type screen in a metal-polymer tape 3 with metal out 4, a central shielded optical module with 5 metal outward 6, shielded optical module 7 with metal outward 8 with overlapping edges 10, drainage conductor 9, bimetal sheath 11, metal braid 12 externally polymeric sheath 13, shielded optical modules open 7 and closed type 5 with a cross-shaped reinforcing element 14, in the windows of which optical fibers 15 are placed 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 conductors in polymer insulation, the presence of contact between metal-polymer tapes, a drainage conductor and a bimetallic tape and a braid nshaetsya effect between the pairs in the frequency range up to 700 MHz and reduced total material consumption of the cable. 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, 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 decrease 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 the metal outward with overlapping edges along the entire length of the cable, and shielded open optical modules are placed between the shielded pairs with the edges overlapping along the entire length of the cable with the metal outward with a cross-shaped force element providing rigidity of the open module and containing optical fibers in each window of this module, while symmetrical shielded pairs and open modules are twisted around a screen of a central closed-type optical module with metal to the outside, also reinforced with a cross-shaped power element with optical fibers in each window of this module, and all screens of symmetric pairs and open and closed type optical modules are made of metal-polymer tape with the metal facing out, providing contact with the drain conductor and overlaid the formation of shielded symmetric pairs and open optical modules of a bimetallic tape, a metal braid and an external polymer shell.