EP1148517A1 - Cable de télécommunication - Google Patents

Cable de télécommunication Download PDF

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Publication number
EP1148517A1
EP1148517A1 EP01400948A EP01400948A EP1148517A1 EP 1148517 A1 EP1148517 A1 EP 1148517A1 EP 01400948 A EP01400948 A EP 01400948A EP 01400948 A EP01400948 A EP 01400948A EP 1148517 A1 EP1148517 A1 EP 1148517A1
Authority
EP
European Patent Office
Prior art keywords
sub
telecommunication
assemblies
cable according
telecommunication cable
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.)
Withdrawn
Application number
EP01400948A
Other languages
German (de)
English (en)
Inventor
Koenrad Vermout
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.)
Nexans SA
Original Assignee
Nexans SA
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.)
Filing date
Publication date
Priority claimed from EP00401084A external-priority patent/EP1148516A1/fr
Application filed by Nexans SA filed Critical Nexans SA
Priority to EP01400948A priority Critical patent/EP1148517A1/fr
Publication of EP1148517A1 publication Critical patent/EP1148517A1/fr
Withdrawn legal-status Critical Current

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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
    • H01B11/002—Pair constructions
    • 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

Definitions

  • the present invention relates to a telecommunication cable comprising at least two telecommunication sub-assemblies, each sub-assembly comprising at least one group of at least two signal conductors, said at least one group being surrounded by a conductive shield, and the conductive shields of adjacent sub-assemblies being in electrical contact with each other.
  • Such a telecommunication cable is already known in the art, e.g. from the International Patent Application PCT/US98/08027 (WO 98/48430).
  • the individual telecommunication sub-assemblies need to be separated from each other by shielding means in order to avoid cross-talk and electro-magnetic interferences. Therefore, in the cable of this document, four unshielded twisted pairs or telecommunication sub-assemblies are nested in channels formed by fins of a cross-shaped core, the core material being conductive and forming a longitudinal shield, and the core itself is surrounded by a conductive shield.
  • the construction of the cross-shaped shielding core is complex and the corresponding production cost is high.
  • An object of the present invention is to provide a telecommunication cable of the above known type but which is easier to manufacture, relatively cheaper in production and in material, and more resistant to cable bending.
  • this object is achieved due to the fact that said at least one group is surrounded by an insulating medium and that each of said conductive shields is made of a layer of conductive material deposited on said insulating medium.
  • the transmission sub-assemblies are individually shielded by providing a deposited metal layer on an insulation medium surrounding the signal conductors, the cross-shaped shielding core of the cable is no longer necessary. This reduces dramatically the production cost and the complexity of the cable assembly.
  • the conductive material deposition technology allows applying an acceptable metal thickness at a speed of several hundred meters per minute.
  • the deposition can be done either in a separate production step or on-line on the insulation line before the "take-up". The total insulation process time may so be reduced.
  • the cross-section of the telecommunication sub-assemblies has the shape of a portion of a pie. A cable assembly with a circular section can so easily be obtained.
  • the signal conductors of each group may be twisted inside the insulating medium. They can also be longitudinally spaced and located in parallel with respect to one another.
  • the conductors are embedded within the insulating medium.
  • the conductors When the conductors are located parallel in parallel with respect to one another and embedded within the insulating medium, they are thus regularly spaced, and the twisting of the conductors may no longer be necessary. This also simplifies the production process while maintaining efficient characteristics against cross-talk and electro-magnetic interferences owing to the signal conductors being embedded into the insulating medium. This will also give a better guarantee for overall uniformity of the transmission cable and therefore on the transmission properties.
  • the telecommunication sub-assembly 10 shown at Fig. 1 comprises two signal conductors 11 and 12 embedded in parallel in an insulating medium 13 in order to form a balanced transmission pair.
  • the single body insulating material 13 embedding the conductors is preferably polyethylene and the distance between the conductors 11 and 12 is maintained constant along the whole transmission path.
  • the external surface of the so obtained form is covered with a conductive material deposited layer 14 uniformly applied through e.g. plasma deposition.
  • the conductive material is preferably copper [Cu] or aluminum [Al].
  • the applied thickness should be of several micrometers depending upon the required shielding performance and on the used material.
  • This layer 14 will act as an electro-magnetic shield around the pair of conductors 11 and 12.
  • the so obtained shielded telecommunication sub-assembly 10 shows efficient characteristics against cross-talk and electro-magnetic interferences, even at relatively high frequencies, although there is no need to twist the signal conductors inside the embedding insulating medium 13.
  • the choice of material used for the conductive layer 14, its thickness and uniformity influence the shielding efficiency.
  • the applied layer 14 should minimally be sufficient to meet the IS011801 Cat.7 cross-talk specification.
  • a metal plasma-deposit conductive layer 14 By use of a metal plasma-deposit conductive layer 14, a relatively costly production step is avoided.
  • other known deposition techniques may be used without going out of the scope of the present invention, as e.g. a sputteringdeposition or ion-deposition techniques.
  • the current plasma deposition technology allows applying the requested thickness at a speed of several hundred meters per minute.
  • the deposition can be done in a separate production step or on-line on the insulation line before the "take-up". By making the sub-assembly in one production step on the insulation line, the total insulation process time will be reduced, and the pairing of the individual wires is not necessary. This will also give a better guarantee for overall uniformity and therefore transmission properties.
  • the cross-section of the telecommunication sub-assembly 10 substantially has the shape of a portion of a pie.
  • the telecommunication sub-assemblies 10 to 13 fit together with their metal plasma-deposit conductive shields, as 14, into electrical contact with each other.
  • the resulting cable assembly 20 has a circular cross-section.
  • the cable assembly 20 is provided with a central channel adapted to receive one or more drain wires 31 as shown at Fig. 3.
  • the drain wire 31 is into electrical contact with the conductive shields of all the telecommunication sub-assemblies 10 to 13.
  • the cable 20 further has an external metallic shield 32 surrounding the telecommunication sub-assemblies 10, 11, 12 and 13, as shown at Fig. 3.
  • the external metallic shield 32 is constituted by a metallic tape or braided wires applied around the cable core and into electrical contact with the conductive shields, as 14, of all the sub-assemblies.
  • the flexibility of the cable 20 will be improved if the transmission cables 10, 11, 12 and 13 are helicoidally arranged.
  • the indicated amount and shape of individually shielded telecommunication sub-assemblies forming the cable is also not a limitation of the invention.
  • each sub-assembly may be used to form the cable according to the invention.
  • all the sub-assemblies forming the cable need not to have a same section, or a section having the shape of a portion of a pie.
  • the invention also applies to such cables and sub-assemblies in which the conductors are twisted in the form of pairs or quads, and the twisted or parallel conductors need not necessarily be embedded in the insulating medium, as such a medium may only surround them.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Communication Cables (AREA)
EP01400948A 2000-04-18 2001-04-12 Cable de télécommunication Withdrawn EP1148517A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01400948A EP1148517A1 (fr) 2000-04-18 2001-04-12 Cable de télécommunication

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP00401084A EP1148516A1 (fr) 2000-04-18 2000-04-18 Ensemble de câbles de télécommunication avec des paires individuellement blindées
EP00401084 2000-04-18
EP01400948A EP1148517A1 (fr) 2000-04-18 2001-04-12 Cable de télécommunication

Publications (1)

Publication Number Publication Date
EP1148517A1 true EP1148517A1 (fr) 2001-10-24

Family

ID=26073463

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01400948A Withdrawn EP1148517A1 (fr) 2000-04-18 2001-04-12 Cable de télécommunication

Country Status (1)

Country Link
EP (1) EP1148517A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2439355A (en) * 2006-06-21 2007-12-27 Ventcroft Ltd Method and apparatus for manufacturing an insulated electrical cable.
CN103915159A (zh) * 2014-03-10 2014-07-09 安徽省高沟电缆有限公司 一种低烟无卤防紫外线特种电缆

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3640464A1 (de) * 1986-11-27 1988-06-09 Siemens Ag Mehradrige als flachleitung ausgebildete anschluss- oder verbindungsschnur
US5574250A (en) * 1995-02-03 1996-11-12 W. L. Gore & Associates, Inc. Multiple differential pair cable

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3640464A1 (de) * 1986-11-27 1988-06-09 Siemens Ag Mehradrige als flachleitung ausgebildete anschluss- oder verbindungsschnur
US5574250A (en) * 1995-02-03 1996-11-12 W. L. Gore & Associates, Inc. Multiple differential pair cable

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2439355A (en) * 2006-06-21 2007-12-27 Ventcroft Ltd Method and apparatus for manufacturing an insulated electrical cable.
CN103915159A (zh) * 2014-03-10 2014-07-09 安徽省高沟电缆有限公司 一种低烟无卤防紫外线特种电缆

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