RU2604653C2 - Unshielded symmetrical four-pair cable of category 6 - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and can be used in makeups of symmetric communication cables within a shared network or structured cable systems. Unshielded symmetrical four-pair cable of 6 category comprises strands in polymer insulation, packed in pairs with strand pitches, with external polymer shell, one of the pairs is central in polymer dividing band, three other pairs are twisted around it, each of which is divided by polymer element whose dimensions are limited by pair diameter, and separating polymer band is applied on central pair with overlapping edges along the entire length, each of four pairs is placed in polymer perforated tape with overlapping edges along the entire cable length, and central pair is additionally placed into the second polymer perforated tape with overlapping edges along the entire cable length, and separating elements also have perforated shell.

EFFECT: invention ensures reduction of influence between pairs due to mutual arrangement thereof.

1 cl, 1 dwg

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

The known design of a four-pair cable containing copper conductors in polymer insulation, twisted with different pitch, in a common external polymer shell (book "Structured cable systems", authors: AB Semenov, SK Strizhakov, IR Sunchely, DMK Publishing House, M. 2002, 4th edition, p. 109, Figs. 3.4 and 3.5). The disadvantage of this design is a significant limitation on transient attenuation in the range above 250 MHz at a length of 100 meters.

To improve these characteristics of transition attenuation, screens are used both on the pairs themselves and on common screens on the cable core (Fig. 3.4 and 3.5 of the same book).

A well-known design of a symmetrical four-pair Category 6 cable for a range of up to 250 MHz at a length of 100 meters for structured cable systems (Teldor 2006 Wires and cables, Russia LTD, p. 23). The cable consists of four pairs twisted with different steps around a central polymer cross-shaped profile. An increase in the distance between the conductors is achieved by introducing a cross-shaped polymer profile into the structure.

Design disadvantage: the cross-shaped profile and its dimensions provide improved transmission characteristics, in particular, the mutual influence between the pairs. However, the edges of the cross-shaped profile cannot be increased significantly, since the overall diameter of the cable will increase and the flexibility of the cable will deteriorate.

A four-pair cable design is described in the prospectus of Teldor, Wires and Cables, Russia Ltd. 2006, p. 23, Category 6 cable (250 MHz), unshielded (UTP).

The cable contains conductors with a diameter of 0.575 mm with polyolefin insulation, the outer diameter of the core is 1.0 mm. Four pairs are twisted around a central polymer cross-shaped profile. The outer diameter of the cable is 6.7 mm, the thickness of the outer sheath is 0.7 mm, the wall thickness (ribs of the cross-shaped polymer profile) 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 polymer profile, which leads to an increase in the rigidity of the cable structure, deterioration of its flexibility and increase in its diameter.

The closest in technical essence is the design of a symmetric four-pair cable according to patent No. 2424593, RU 2424593 C1, IPC НВВ 11/02, published on July 20, 2011. Bull. No. 20, authors: Portnov E.L., Semenov A.B., Nikeshin A.I. The cable is unshielded. The cable contains conductors in polymer insulation, twisted in pairs with different twisting steps, with an external polymer sheath, one of the pairs is central in the polymer separation tape, three other pairs are twisted around it, each of which is separated by a polymer element, the dimensions of which are limited by the diameter of the pair, and along the length of the separating polymer tape is superimposed on the Central pair with overlapping edges along the entire length.

The disadvantage of this design is the increase in material consumption and cable size with the incomplete use of opportunities to reduce the effect between pairs.

SUMMARY OF THE INVENTION

The task to which this technical solution is directed is to create such a design of a symmetrical four-pair cable that allows reducing the mutual influence between the pairs due to their mutual arrangement while maintaining material consumption, flexibility and other mechanical characteristics.

To solve this problem, in a four-pair cable containing conductors in polymer insulation, one of the pairs is central with a dividing polymer tape wound around a central pair, around which three other pairs are twisted, each of which is divided along the entire length by a polymer element, the dimensions of which are limited by diameter pairs, and the separating polymer tape on the central pair is wound with overlapping edges along the entire length, while on the central pair and three other pairs, a polymer separating l Tent with overlapping edges along the entire length of the cable and all polymer tapes and separation elements are perforated along the entire length of the cable.

List of figures

In FIG. 1 shows the design of an unshielded symmetrical four-pair cable of category 6.

The implementation of the invention

Category 6 unshielded symmetrical four-pair cable design contains polymeric insulation conductors - 1, central twisted pair - 2 in a separating polymer perforated tape - 3, additional separating polymer perforated tape on the central pair - 4, three other polymer perforated tapes on three other pairs - 5 6 separated along the entire length by polymer perforated elements; 7, the outer polymer cable sheath.

In this design, due to the relative position of the pairs of four-pair cable, the introduction of a separating polymer perforated tape and an additional separating polymer perforated tape on the central pair, polymer perforated tapes with overlapping edges on the other three pairs and separating polymer perforated elements between the other three pairs, the mutual influence between the pairs is reduced in the frequency range above 300 MHz.

Claims (1)

Unshielded symmetric four-pair cable of category 6, containing polymeric insulated conductors twisted into pairs with different twisting steps, one of the pairs is central in the polymer separation tape, around which three other pairs are twisted, each of which is separated by a polymer element, the dimensions of which are limited by the diameter of the pair and a dividing polymer tape is superimposed on the central pair with overlapping edges along the entire length with the outer polymer shell, characterized in that each of the four pairs is placed in limernuyu perforated tape with overlapping edges across the length of the cable, and the central pair of additional resin is placed into a second perforated tape edges overlap across the length of the cable, and all the dividing elements are also perforated shell.

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