EP2725585B1 - Câble de transmission de données a paires ou quartes torsadées - Google Patents

Câble de transmission de données a paires ou quartes torsadées Download PDF

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Publication number
EP2725585B1
EP2725585B1 EP13185986.0A EP13185986A EP2725585B1 EP 2725585 B1 EP2725585 B1 EP 2725585B1 EP 13185986 A EP13185986 A EP 13185986A EP 2725585 B1 EP2725585 B1 EP 2725585B1
Authority
EP
European Patent Office
Prior art keywords
wires
fact
cable according
extend
opposite
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP13185986.0A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2725585A1 (fr
Inventor
Patrice Lallinec
Arnaud Perrier
Daniel Fillatre
Jérôme Maherault
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Acome SCOP
Original Assignee
Acome SCOP
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Acome SCOP filed Critical Acome SCOP
Priority to PL13185986T priority Critical patent/PL2725585T3/pl
Publication of EP2725585A1 publication Critical patent/EP2725585A1/fr
Application granted granted Critical
Publication of EP2725585B1 publication Critical patent/EP2725585B1/fr
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/02—Cables with twisted pairs or quads
    • H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
    • H01B11/10—Screens specially adapted for reducing interference from external sources
    • H01B11/1033—Screens specially adapted for reducing interference from external sources composed of a wire-braided conductor

Definitions

  • the present invention relates to a data transmission cable which comprises, inside a sheath, a plurality of pairs or quads of insulated conductors, this plurality of pairs or quads being surrounded by screening wires. arranged in a helix.
  • this insulating sheath 2 which is generally made of a plastic material such as polyethylene, polyvinyl chloride or the like, a plurality of electrical conductors referenced 30 and 30 'are provided.
  • These conductors which are metal conductors for example copper, extend in a direction which is that of the longitudinal axis X-X 'of the cable. They have a circular section and a diameter of a predetermined value which is in particular a function of their application.
  • conductors 30 and 30 may for example be used for the transmission of computer data signals, while other conductors transmit television signals or telephone signals.
  • each conductor 30 and 30 ' is arranged, according to a technique known per se and which is not the subject of the invention, in a plastic sheath 31 which surrounds it and which has insulating properties of electricity.
  • the conductors 30 and 30 ' are arranged in the form of pairs 3.
  • the two leads 30 and 30 'of each pair 3 are twisted, which means (throughout the present application) that they are helically wound around each other.
  • these different pairs 3 are twisted together in a helix, in a first winding direction f called "wiring direction”.
  • winding direction f refers to the general direction given to the twist.
  • each pair 3 is surrounded by a metal casing 4 which provides a first shield.
  • tin-plated copper wires 5 that is to say tin-coated, may be arranged around the core of the cable, the core formed by the twist of the pairs. .
  • screening is meant the ability of a device to ensure the reduction of penetration of an electromagnetic field in a specific region.
  • This impedance is expressed in Ohm / m at a given frequency.
  • these copper wires 5 are arranged in a braid formed around the core of the cable 1. More specifically, this braid consists of an interweaving of layers of copper wires. Each ply is constituted by a set of six tinned copper wires.
  • half of the total number of copper wires is helically arranged around the core of the cable 1 in the same direction as the winding direction, referred to as the higher wiring direction.
  • the second part of the son plies is arranged in the opposite direction, in the same pitch as the first part of the plies.
  • opposite direction or “opposite winding direction” it is meant that the helix formed by the corresponding screening wires wraps around the core of the cable 1 in a direction opposite to that of the wiring direction.
  • figure 2 For the sake of simplification and to facilitate the reading of the following figures, it has been proposed, as shown in figure 2 , to represent the cable 1 devoid of its sheath 2, with the pairs of conductors 3 arranged in a helix, symbolized by sets of elongated parallelograms.
  • the screening son 5 distributed in one direction or the other, and therefore referenced 5f and 5g, are here represented simply in the form of parallel lines.
  • LAN S / FTP LAN S / FTP
  • a braid of 96 tinned copper wires one-tenth of a millimeter in diameter, divided into 48 wires arranged in one direction and 48 wires arranged in the opposite direction.
  • the measured transfer impedance is then of the order of 20 mOhm / m at 100 MHz.
  • the present Applicant for reasons of economy of material and cost, has proposed to reduce the number of braided yarns from 96 to 72, while keeping them balanced in one direction and the other (36 wires in one direction and 36 wires in the opposite direction).
  • the present Applicant proposes to reduce the cost of manufacturing such a cable while continuing to satisfy the quality of general electromagnetic coating, as enacted by the aforementioned standard.
  • the present invention relates to a data transmission cable which comprises, inside a sheath, a plurality of pairs or quads of insulated conductors, these pairs or quads being twisted together in a helix in a first winding direction denominated wiring direction, said plurality of pairs or quads of insulated conductors being surrounded by helically arranged screening wires, characterized in that a majority of said shielding wires arranged in a helix extends in a winding direction opposite to said first direction of winding.
  • the present Applicant has been able to highlight the minimal usefulness, or even the uselessness of the wires arranged in a helix rotating in the same direction as the wiring direction of the pairs between them.
  • the screening wires 5 which are divided into two groups 5f and 5g, and which respectively extend on the one hand in a winding direction f called the wiring direction and, on the other hand, in the direction of opposite winding g, have the distinction of being more numerous in the winding direction opposite the first direction of winding.
  • asymmetrical shielding we can then speak of "asymmetrical shielding".
  • This minimum amount of son keeps in position 5g son arranged in the opposite direction to the wiring direction.
  • the wire 5f arranged in the winding direction f consists of a less conductive material and a priori less expensive than that which constitutes the screening son 5g.
  • the son 5g and 5f are arranged helically, braided or gimped.
  • This winding, braided or wrapped, can be made with a pitch of a helix of between 20 and 250 mm.
  • a number of screening wires are arranged in the winding direction opposite to the first winding direction.
  • the wires 5f are absent and replaced by a helical winding 7 of a material devoid of screening properties.
  • the winding material 7 is wound around the wires 5g to keep them in position around the core of the cable.
  • This winding material 7 is for example a plastic material such as polyester, which may have a circular or generally flattened section.
  • the taping is replaced by the laying of the sheath 2, simultaneously positioning the 5g screening son around the pairs 3. This is the reason why it is exceptionally represented.
  • This embodiment has the advantage of no longer requiring the presence of any intermediate holding element between the screening son and the sheath.
  • the screening yarns 5g are not distributed in the form of webs consisting of adjacent yarns, but are arranged individually at a substantially constant spacing.
  • a garland winding 7 is set up around the assembly so as to ensure the mechanical strength.
  • the transfer impedance value is better for the 60-wire version in which the number of wires in the opposite direction to the wiring direction is 60.
  • the value Zt is significantly improved by arranging the majority of the wires in the opposite direction to the wiring direction of the pairs 3 to each other.
  • the son 5 are conductive and preferably of a material such as copper (tinned or not).
  • a material such as copper (tinned or not).
  • conductors for example silver
  • semiconductor materials for example carbon fibers.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Communication Cables (AREA)
  • Insulated Conductors (AREA)
EP13185986.0A 2012-10-25 2013-09-25 Câble de transmission de données a paires ou quartes torsadées Active EP2725585B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL13185986T PL2725585T3 (pl) 2012-10-25 2013-09-25 Kabel do transmisji danych ze skręcanymi parami lub czwórkami

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1260170A FR2997545B1 (fr) 2012-10-25 2012-10-25 Cable de transmission de donnees a paires ou quartes torsadees

Publications (2)

Publication Number Publication Date
EP2725585A1 EP2725585A1 (fr) 2014-04-30
EP2725585B1 true EP2725585B1 (fr) 2015-07-22

Family

ID=47429925

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13185986.0A Active EP2725585B1 (fr) 2012-10-25 2013-09-25 Câble de transmission de données a paires ou quartes torsadées

Country Status (4)

Country Link
EP (1) EP2725585B1 (es)
ES (1) ES2548431T3 (es)
FR (1) FR2997545B1 (es)
PL (1) PL2725585T3 (es)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020108058A1 (de) * 2020-03-24 2021-09-30 Leoni Kabel Gmbh Kabelschirmung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1019727B (de) * 1952-05-07 1957-11-21 Siemens Ag Symmetrische Hochfrequenzleitung mit einem Schirm aus metallischem Geflecht
DE1975761U (de) * 1967-07-22 1967-12-28 Rheinische Draht Und Kabelwerk Kabel und leitungen mit geflechten aus metalldraehten als aussenleiter oder schirm.
DE2412259A1 (de) * 1974-03-14 1975-09-18 Kabel Metallwerke Ghh Abgeschirmte elektrische leitung
DE10303809A1 (de) * 2003-01-31 2004-08-12 Nexans Datenübertragungskabel zum Anschluss an orstveränderliche Geräte
FR2948487B1 (fr) * 2009-07-27 2011-08-26 Acome Soc Cooperative De Production Sa A Capital Variable Cable de communication et de transmission multimedia

Also Published As

Publication number Publication date
EP2725585A1 (fr) 2014-04-30
ES2548431T3 (es) 2015-10-16
PL2725585T3 (pl) 2015-11-30
FR2997545B1 (fr) 2014-12-26
FR2997545A1 (fr) 2014-05-02

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