EP0895253A1 - Basic telecom cable and composite cable for high rate signals - Google Patents

Basic telecom cable and composite cable for high rate signals Download PDF

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Publication number
EP0895253A1
EP0895253A1 EP98401939A EP98401939A EP0895253A1 EP 0895253 A1 EP0895253 A1 EP 0895253A1 EP 98401939 A EP98401939 A EP 98401939A EP 98401939 A EP98401939 A EP 98401939A EP 0895253 A1 EP0895253 A1 EP 0895253A1
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EP
European Patent Office
Prior art keywords
screen
sheath
cable
internal
telecommunication cable
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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.)
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Application number
EP98401939A
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German (de)
French (fr)
Inventor
Martine Decorps
Jacques Gannat
Jean Gombert
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Sagem SA
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Sagem SA
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Publication of EP0895253A1 publication Critical patent/EP0895253A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/08—Flat or ribbon cables
    • H01B7/0861—Flat or ribbon cables comprising one or more screens
    • 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
    • H01B11/1091—Screens specially adapted for reducing interference from external sources with screen grounding means, e.g. drain wires

Definitions

  • the present invention relates to a cable basic telecommunication and a telecommunication cable compound comprising several telecommunication cables basic, for high frequency signals telephone and / or data processing, particularly intended for the transmission of digital data at high speed of the order of 100 to 500 Mbit / s.
  • a local network installed in a building there are two kinds of cables: low cables capacity with four, eight or twelve pairs, called cables horizontal distribution or capillary cables, and high capacity cables with twenty four, thirty two, sixty or one hundred and twenty eight pairs, called distribution cables vertical or bypass cable.
  • Ring roads are usually made from cable elements capillary, each element of capillary cable being in this case considered a telecommunication cable elementary.
  • the bypass cables extend between a general dispatcher and floor distributors or between floor distributors.
  • a basic telecommunication cable comprising two quarter of insulated conductors surrounded by an envelope comprising an internal sheath of insulating material disposed directly in contact with the conductive wires insulated, a metal screen arranged around the sheath internal and a second sheath surrounding the metal screen.
  • the screen serves as shielding to prevent signals carried by the cable are not disturbed by external electromagnetic radiation, as well as to avoid disturbance of the surrounding space by the electromagnetic radiation from the cable, especially for remove crosstalk between capillary cables adjacent.
  • the metal screen is generally made of a metal tape (usually aluminum) attached to a polymer tape and arranged around the sheath internal either by helical winding or according to a laying lengthwise, the edges of the ribbon being arranged to overlap.
  • Each interruption of the shielding provided by the screen is a source parasitic emissions all the more important as the frequency is high.
  • a telecommunications cable is proposed. elementary comprising several isolated wires, an internal sheath of insulating material surrounding the wires insulated conductors, and a conductive screen in the form of ribbon in contact with the internal sheath, in which the screen is fixed to the internal sheath by gluing or welding.
  • the screen has an insulating layer and a conductive layer fixed to each other and the screen is fixed to the sheath internal by the insulating layer. So the conductive layer is on the outside of the cable and allows a connection easy.
  • the cable has a second sheath surrounding the screen and a protective tape between the screen and the second sheathed and having overlapping edges. So, we minimize the risk of making breaks in the screen when cutting the second sheath to access the screen.
  • the protective tape has a conductive layer and an insulating layer attached to the conductive layer, and the conductive layer of the protective tape is in contact with the conductive layer of the screen.
  • the conductive layer of the protective tape is in contact with the conductive layer of the screen.
  • the telecommunication cable illustrated elementary has two twisted star quads 2 comprising each four conductive wires 3 covered with a layer individual insulation 4, for example made of polyethylene or polypropylene.
  • the two quartes 2 are contained in a envelope generally designated in 5 comprising a sheath internal 6.
  • the internal sheath 6 is preferably a sheath in thermoplastic material produced by extrusion around juxtaposed quarters.
  • the internal sheath 6 can also be made in the form of a tightly wound ribbon helically or laid lengthwise with longitudinal edges overlap and can be glued or welded to form an oval or elliptical tube.
  • a tearing line 7 allowing the internal sheath 6 to be torn during a connection of conductive wires for example to contacts self-stripping of a distribution module.
  • the internal sheath 6 is surrounded by a screen 8 comprising in the first mode an insulating layer 9 attached to a layer conductive 10.
  • the screen 8 is for example produced by fixing by gluing a polyester or polyethylene tape and a aluminum or copper tape.
  • the composite tape as well obtained is arranged around the internal sheath 6, by example according to a helical winding as illustrated by Figure 1 preferably with the insulating layer 9 in contact with the internal sheath 6.
  • the screen 8 is not fixed on itself edge on edge but is fixed to the internal sheath 6 by bonding or welding.
  • the paste operation can be made for example by arranging at the outlet of the extruder making the internal sheath 6, or at the entry of a recovery machine, an adhesive application device hot melt which is deposited in a thin layer on the internal sheath then by carrying out a helical wrapping an aluminum and polyester composite tape, the layer of polyester having for example a thickness of about 20 at 50 ⁇ m, while the aluminum layer has a thickness about 10 to 80 ⁇ m.
  • fixing the screen 8 to the internal sheath 6 can also be achieved by welding the screen to the sheath, for example by applying screen 8 while the material forming the internal sheath 6 is still hot or in softening the external surface of the internal sheath 6 immediately upstream of the application device the screen.
  • a second sheath 11 is generally produced around screen 8 to protect it from attacks during handling of the telecommunications cable elementary.
  • the second sheath 11 is for example produced by extrusion.
  • Prior to the realization of the second sheath 11 is preferably put in place a rope tear 12 and a continuity thread 13.
  • the basic telecommunication cable as well obtained can be used either as a capillary cable, preferably with an external sheath 11, either be associated with other basic telecommunication cables for form a bypass cable as shown in Figure 2 on which the basic telecommunication cables 1 do not have an outer sheath 11 and are arranged so that the screens 8 are in contact with each other other.
  • the cable ring road has several telecommunication cables elementary 1 arranged if necessary around an organ central carrier 14.
  • the cable has also one or more stuffing rods 15, for example a polymer rod, intended to give a structure homogeneous with the cable in order to avoid in particular a tangle basic telecommunication cables.
  • the stuffing rod 15 can also contain one or more optical fiber.
  • Telecommunication cables elementary and the stuffing rod are surrounded by a main metal screen 16 itself surrounded by a outer sheath 17.
  • a main metal screen 16 itself surrounded by a outer sheath 17.
  • the cables of elementary telecommunications are in contact by the screens 8 it suffices to provide a single continuity wire 18 in contact with the main screen 16.
  • Figure 3 illustrates a second embodiment an elementary telecommunication cable 1 comprising as before two quartes 2 extending to the interior of an envelope 5 comprising an internal sheath 6 covered with a screen 8.
  • the screen 8 consists of a single metal layer 10 helically wound on the inner sheath 6.
  • a ribbon of protection 19 is this time arranged around the screen 10.
  • the protective tape 19 is an insulating synthetic polymer tape arranged lengthwise and having overlapping edges 20. The protective tape 19 therefore does not adhere to screen 8, it can thus be removed easily when cutting the second sheath 11 for strip the screen 8 and make a connection of the cable elementary transmission.
  • Figure 4 illustrates a third embodiment in which the elementary transmission cable again includes two quartes 2 as before extending in an envelope 5 comprising a sheath internal 6.
  • screen 8 is a composite ribbon wound helically around of the internal sheath 6.
  • screen 8 is covered by a protective tape composite 21 comprising a metal layer 22 in contact with the metal layer 10 of the screen 8 and a layer insulating 23.
  • the protective tape 21 is this time wound in a helix according to a reverse pitch of the winding in screen propeller 8, the edges 24 being arranged to be overlap.
  • the protective tape 21 is covered with a second sheath 11 made of insulating material.
  • the telecommunication cable elementary according to the invention can be achieved with pairs to replace the fourths.
  • screen 8 and protective tape 19, 21 were illustrated according to three different embodiments only, we can vary the layout combinations and structure of each of these elements of the cable basic telecommunications, for example by having 8 long screen associated with a rolled up protective tape in a helix or itself arranged lengthwise, etc. so that the edges of the screen and the edges of the protective tape are offset from each other.
  • the telecommunications cable elementary according to the invention can be achieved by providing means of identification allowing identification easy conductors within a transmission cable elementary or identification of a cable elementary transmission within a compound cable, by example by providing an internal sheath 6 in material transparent and insulating layers 4 of different colors or including nets of different colors, and / or by making a marking on the second sheath 11 or on screen 8 in the form of one or more nets or bands colored extruded, printed or cold stamped or hot.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Insulated Conductors (AREA)
  • Communication Cables (AREA)

Abstract

The telecommunication cable is made up of pairs of insulated wires (3) twisted together, with an internal sheath (6) made of an insulating material and enclosing the twisted pairs. A conductive screen (8) is formed from a ribbon which is wound over the internal sheath. The ribbon is fixed to the internal sheath by gluing or welding. The screen has an insulating layer (9) and a conductive layer (10) fixed one to the other, and the screen is attached to the internal sheath by the insulating layer. A second sheath (11) is placed around the screen and a protective ribbon (19,21) between the screen and the second sheath has its edges overlapping.

Description

La présente invention concerne un câble de télécommunication élémentaire et un câble de télécommunication composé comprenant plusieurs câbles de télécommunication élémentaires, pour des signaux à haute fréquence téléphonique et/ou téléinformatique, particulièrement destinés à la transmission de données numériques à haut débit de l'ordre de 100 à 500 Mbit/s.The present invention relates to a cable basic telecommunication and a telecommunication cable compound comprising several telecommunication cables basic, for high frequency signals telephone and / or data processing, particularly intended for the transmission of digital data at high speed of the order of 100 to 500 Mbit / s.

Dans un réseau local installé dans un immeuble, il existe deux sortes de câbles : des câbles à faible contenance avec quatre, huit ou douze paires, dits câbles de distribution horizontale ou câbles capillaires, et des câbles à forte contenance avec vingt quatre, trente deux, soixante ou cent vingt huit paires, dits câbles de distribution verticale ou câble de rocade. Les câbles de rocade sont généralement constitués à partir d'éléments de câble capillaire, chaque élément de câble capillaire étant dans ce cas considéré comme un câble de télécommunication élémentaire. Les câbles de rocade s'étendent entre un répartiteur général et des répartiteurs d'étage ou entre des répartiteurs d'étage.In a local network installed in a building, there are two kinds of cables: low cables capacity with four, eight or twelve pairs, called cables horizontal distribution or capillary cables, and high capacity cables with twenty four, thirty two, sixty or one hundred and twenty eight pairs, called distribution cables vertical or bypass cable. Ring roads are usually made from cable elements capillary, each element of capillary cable being in this case considered a telecommunication cable elementary. The bypass cables extend between a general dispatcher and floor distributors or between floor distributors.

On connaít, notamment du document EP-A-599 672, un câble de télécommunication élémentaire comprenant deux quartes de fils conducteurs isolés entourées par une enveloppe comprenant une gaine interne en matériau isolant disposé directement en contact avec les fils conducteurs isolés, un écran métallique disposé autour de la gaine interne et une seconde gaine entourant l'écran métallique.We know, in particular from document EP-A-599 672, a basic telecommunication cable comprising two quarter of insulated conductors surrounded by an envelope comprising an internal sheath of insulating material disposed directly in contact with the conductive wires insulated, a metal screen arranged around the sheath internal and a second sheath surrounding the metal screen.

L'écran sert de blindage pour éviter que les signaux transportés par le câble ne soient perturbés par des rayonnements électromagnétiques extérieurs, ainsi que pour éviter une perturbation de l'espace environnant par le rayonnement électromagnétique du câble, en particulier pour supprimer la diaphonie entre des câbles capillaires adjacents.The screen serves as shielding to prevent signals carried by the cable are not disturbed by external electromagnetic radiation, as well as to avoid disturbance of the surrounding space by the electromagnetic radiation from the cable, especially for remove crosstalk between capillary cables adjacent.

En pratique l'écran métallique est généralement constitué d'un ruban de métal (en général de l'aluminium) fixé à un ruban de polymère et disposé autour de la gaine interne soit par enroulement hélicoïdal, soit selon une pose en long, les bords du ruban étant disposés pour se chevaucher.In practice, the metal screen is generally made of a metal tape (usually aluminum) attached to a polymer tape and arranged around the sheath internal either by helical winding or according to a laying lengthwise, the edges of the ribbon being arranged to overlap.

Chaque interruption du blindage assuré par l'écran, qu'il s'agisse d'un mauvais recouvrement des bords de l'écran ou d'une pliure de celui-ci, est une source d'émissions parasites d'autant plus importante que la fréquence est élevée.Each interruption of the shielding provided by the screen, whether it is poor overlap of the edges of the screen or a fold of it, is a source parasitic emissions all the more important as the frequency is high.

Ce problème concerne non seulement le câble lui-même mais également tous les équipements associés au câble en particulier les connecteurs et l'interface entre un câble et un connecteur. A ce propos il est généralement connu d'utiliser un connecteur blindé enserrant l'écran sur la totalité de son pourtour. Pour réaliser cette opération il est nécessaire lors de l'installation d'un câble de télécommunication capillaire de découper la gaine externe afin de pouvoir retirer celle-ci et dégager l'écran. Compte tenu de la faible épaisseur de la gaine externe, il est fréquent que l'écran soit également entaillé lors du découpage de la gaine externe. Cette entaille constitue une amorce de rupture de l'écran qui risque alors de se déchirer lorsque le tronçon de gaine est retiré ou lors d'une pliure du câble de télécommunication de sorte que le blindage électromagnétique du câble n'est plus assuré.This problem affects not only the cable itself but also all the equipment associated with the cable especially the connectors and the interface between a cable and connector. In this connection it is generally known to use a shielded connector enclosing the screen on the whole of its circumference. To perform this operation it is necessary when installing a cable capillary telecommunication to cut the outer sheath in order to be able to remove it and clear the screen. Account given the small thickness of the outer sheath, it is frequent that the screen is also notched during cutting of the outer sheath. This notch constitutes a start of screen rupture which then risks tear when the sheath section is removed or when a kink in the telecommunication cable so that the electromagnetic shielding of the cable is no longer ensured.

Selon l'invention, on propose un câble de télécommunication élémentaire comprenant plusieurs fils isolés, une gaine interne en matériau isolant entourant les fils conducteurs isolés, et un écran conducteur en forme de ruban en contact avec la gaine interne, dans lequel l'écran est fixé à la gaine interne par collage ou soudage.According to the invention, a telecommunications cable is proposed. elementary comprising several isolated wires, an internal sheath of insulating material surrounding the wires insulated conductors, and a conductive screen in the form of ribbon in contact with the internal sheath, in which the screen is fixed to the internal sheath by gluing or welding.

Ainsi, lors des manipulations du câble de télécommunication, les efforts sur l'écran sont répartis non seulement sur l'écran mais également sur la gaine interne dont l'écran est rendu solidaire de sorte que les conséquences d'une amorce de rupture de l'écran sont minimisées et permettent généralement d'éviter le déchirement de l'écran. En outre on a constaté que la fixation de l'écran sur la gaine interne permettait de minimiser le risque de plissement de l'écran lors de la fabrication du câble ainsi que lors des manipulations subséquentes de celui-ci de sorte que le risque de fuites électromagnétiques se trouve minimisé.So when handling the telecommunication cable, the efforts on the screen are distributed not only on the screen but also on the internal sheath whose screen is made integral so that the consequences of a screen break primer are minimized and generally prevent tearing of the screen. In addition, it was found that fixing the screen on the inner sheath minimized the risk of screen puckering during cable manufacturing as well that during subsequent manipulations thereof so the risk of electromagnetic leakage is found minimized.

Selon une version avantageuse de l'invention, l'écran comporte une couche isolante et une couche conductrice fixées l'une à l'autre et l'écran est fixé à la gaine interne par la couche isolante. Ainsi la couche conductrice se présente à l'extérieur du câble et permet une connexion aisée.According to an advantageous version of the invention, the screen has an insulating layer and a conductive layer fixed to each other and the screen is fixed to the sheath internal by the insulating layer. So the conductive layer is on the outside of the cable and allows a connection easy.

Selon un autre aspect avantageux de l'invention, le câble comporte une seconde gaine entourant l'écran et un ruban de protection disposé entre l'écran et la seconde gaine et ayant des bords se chevauchant. Ainsi, on minimise le risque de réaliser des amorces de rupture dans l'écran lors du découpage de la seconde gaine pour accéder à l'écran.According to another advantageous aspect of the invention, the cable has a second sheath surrounding the screen and a protective tape between the screen and the second sheathed and having overlapping edges. So, we minimize the risk of making breaks in the screen when cutting the second sheath to access the screen.

De préférence dans ce cas le ruban de protection comporte une couche conductrice et une couche isolante fixées à la couche conductrice, et la couche conductrice du ruban de protection est en contact avec la couche conductrice de l'écran. Ainsi tout en assurant une protection de l'écran on réduit encore les perturbations électromagnétiques et l'on améliore en conséquence la compatibilité électromagnétique du câble de transmission. En outre on facilite le retrait de l'extrémité découpée de la seconde gaine et du ruban de protection par un glissement métal contre métal du ruban de protection sur l'écran.Preferably in this case the protective tape has a conductive layer and an insulating layer attached to the conductive layer, and the conductive layer of the protective tape is in contact with the conductive layer of the screen. Thus while ensuring protection of the screen we further reduce electromagnetic interference and we improve compatibility accordingly electromagnetic transmission cable. Furthermore we facilitates removal of the cut end of the second sheath and protective tape by metal sliding against metal protective tape on the screen.

D'autres caractéristiques et avantages de l'invention apparaítront à la lecture de la description qui suit de différents modes de réalisation du câble de télécommunication élémentaire selon l'invention et d'un câble de télécommunication composé obtenu à partir de plusieurs câbles de télécommunication élémentaires en référence aux figures ci-jointes parmi lesquelles :

  • la figure 1 est une vue en perspective écorchée agrandie d'un câble de télécommunication élémentaire selon l'invention,
  • la figure 2 est une vue en coupe transversale agrandie d'un câble de télécommunication comprenant plusieurs câbles de télécommunication élémentaires,
  • la figure 3 est une vue analogue à celle de la figure 1 d'un second mode de réalisation de l'invention,
  • la figure 4 est une vue analogue à celle de la figure 1 d'un troisième mode de réalisation de l'invention.
Other characteristics and advantages of the invention will appear on reading the following description of different embodiments of the elementary telecommunication cable according to the invention and of a compound telecommunication cable obtained from several elementary telecommunication cables with reference to the attached figures, among which:
  • FIG. 1 is an enlarged cutaway perspective view of an elementary telecommunication cable according to the invention,
  • FIG. 2 is an enlarged cross-sectional view of a telecommunication cable comprising several elementary telecommunication cables,
  • FIG. 3 is a view similar to that of FIG. 1 of a second embodiment of the invention,
  • Figure 4 is a view similar to that of Figure 1 of a third embodiment of the invention.

En référence à la figure 1, le câble de télécommunication élémentaire illustré, généralement désigné en 1, comporte deux quartes étoiles torsadées 2 comportant chacune quatre fils conducteurs 3 recouverts d'une couche isolante individuelle 4, par exemple en polyéthylène ou en polypropylène.Referring to Figure 1, the telecommunication cable illustrated elementary, generally designated in 1, has two twisted star quads 2 comprising each four conductive wires 3 covered with a layer individual insulation 4, for example made of polyethylene or polypropylene.

Les deux quartes 2 sont contenues dans une enveloppe généralement désignée en 5 comprenant une gaine interne 6. La gaine interne 6 est de préférence une gaine en matière thermoplastique réalisée par extrusion autour des quartes juxtaposées. La gaine interne 6 peut également être réalisée sous forme d'un ruban enroulé de façon serrée en hélice ou posé en long dont les bords longitudinaux se recouvrent et peuvent être collés ou soudés afin de former un tube ovale ou elliptique. A l'intérieur de la gaine interne on prévoit de préférence un filin de déchirement 7 permettant de déchirer la gaine interne 6 lors d'une connexion des fils conducteurs par exemple à des contacts auto-dénudants d'un module de répartition. La gaine interne 6 est entourée d'un écran 8 comprenant dans le premier mode de réalisation une couche isolante 9 fixée à une couche conductrice 10. L'écran 8 est par exemple réalisé en fixant par collage un ruban de polyester ou de polyéthylène et un ruban d'aluminium ou de cuivre. Le ruban composite ainsi obtenu est disposé autour de la gaine interne 6, par exemple selon un enroulement en hélice comme illustré par la figure 1 en disposant de préférence la couche isolante 9 en contact avec la gaine interne 6. Contrairement aux réalisations antérieures l'écran 8 n'est pas fixé sur lui-même bord sur bord mais est fixé à la gaine interne 6 par collage ou par soudage. L'opération de collage peut être réalisée par exemple en disposant à la sortie de l'extrudeuse réalisant la gaine interne 6, ou à l'entrée d'une machine de reprise, un dispositif d'application d'une colle thermofusible qui est déposée selon une couche fine sur la gaine interne puis en réalisant un enrubannage hélicoïdal d'un ruban composite d'aluminium et de polyester, la couche de polyester ayant par exemple une épaisseur d'environ 20 à 50 µm, tandis que la couche d'aluminium à une épaisseur d'environ 10 à 80 µm.The two quartes 2 are contained in a envelope generally designated in 5 comprising a sheath internal 6. The internal sheath 6 is preferably a sheath in thermoplastic material produced by extrusion around juxtaposed quarters. The internal sheath 6 can also be made in the form of a tightly wound ribbon helically or laid lengthwise with longitudinal edges overlap and can be glued or welded to form an oval or elliptical tube. Inside the sheath internal, preferably a tearing line 7 allowing the internal sheath 6 to be torn during a connection of conductive wires for example to contacts self-stripping of a distribution module. The internal sheath 6 is surrounded by a screen 8 comprising in the first mode an insulating layer 9 attached to a layer conductive 10. The screen 8 is for example produced by fixing by gluing a polyester or polyethylene tape and a aluminum or copper tape. The composite tape as well obtained is arranged around the internal sheath 6, by example according to a helical winding as illustrated by Figure 1 preferably with the insulating layer 9 in contact with the internal sheath 6. Unlike the previous achievements the screen 8 is not fixed on itself edge on edge but is fixed to the internal sheath 6 by bonding or welding. The paste operation can be made for example by arranging at the outlet of the extruder making the internal sheath 6, or at the entry of a recovery machine, an adhesive application device hot melt which is deposited in a thin layer on the internal sheath then by carrying out a helical wrapping an aluminum and polyester composite tape, the layer of polyester having for example a thickness of about 20 at 50 µm, while the aluminum layer has a thickness about 10 to 80 µm.

Dans le cas où la couche isolante du ruban composite est compatible avec la matière formant la gaine interne 6, la fixation de l'écran 8 sur la gaine interne 6 peut également être réalisée par soudage de l'écran sur la gaine, par exemple en appliquant l'écran 8 alors que la matière formant la gaine interne 6 est encore chaude ou en ramollissant la surface externe de la gaine interne 6 immédiatement en amont du dispositif d'application de l'écran.In case the insulating layer of the tape composite is compatible with the material forming the sheath internal 6, fixing the screen 8 to the internal sheath 6 can also be achieved by welding the screen to the sheath, for example by applying screen 8 while the material forming the internal sheath 6 is still hot or in softening the external surface of the internal sheath 6 immediately upstream of the application device the screen.

Une seconde gaine 11 est généralement réalisée autour de l'écran 8 pour protéger celui-ci contre des agressions lors des manipulations du câble de télécommunication élémentaire. La seconde gaine 11 est par exemple réalisée par extrusion. Préalablement à la réalisation de la seconde gaine 11 on met de préférence en place un filin de déchirement 12 et un fil de continuité 13.A second sheath 11 is generally produced around screen 8 to protect it from attacks during handling of the telecommunications cable elementary. The second sheath 11 is for example produced by extrusion. Prior to the realization of the second sheath 11 is preferably put in place a rope tear 12 and a continuity thread 13.

Le câble de télécommunication élémentaire ainsi obtenu peut être utilisé soit comme câble capillaire, de préférence avec une gaine externe 11, soit être associé à d'autres câbles de télécommunication élémentaires pour former un câble de rocade comme illustré par la figure 2 sur laquelle les câbles de télécommunication élémentaires 1 ne comportent pas de gaine externe 11 et sont disposés pour que les écrans 8 soient en contact les uns avec les autres. Dans le mode de réalisation illustré le câble de rocade comporte plusieurs câbles de télécommunication élémentaires 1 disposés si nécessaire autour d'un organe porteur central 14. Si nécessaire le câble comporte également un ou plusieurs joncs de bourrage 15, par exemple un jonc en polymère, destiné à donner une structure homogène au câble afin d'éviter en particulier un enchevêtrement des câbles de télécommunication élémentaires. Le jonc de bourrage 15 peut également contenir une ou plusieurs fibres optiques. Les câbles de télécommunication élémentaires et le jonc de bourrage sont entourés par un écran métallique principal 16 lui-même entouré par une gaine externe 17. Dans l'exemple illustré où les câbles de télécommunication élémentaires sont en contact par les écrans 8 il suffit de prévoir un seul fil de continuité 18 en contact avec l'écran principal 16.The basic telecommunication cable as well obtained can be used either as a capillary cable, preferably with an external sheath 11, either be associated with other basic telecommunication cables for form a bypass cable as shown in Figure 2 on which the basic telecommunication cables 1 do not have an outer sheath 11 and are arranged so that the screens 8 are in contact with each other other. In the illustrated embodiment the cable ring road has several telecommunication cables elementary 1 arranged if necessary around an organ central carrier 14. If necessary, the cable has also one or more stuffing rods 15, for example a polymer rod, intended to give a structure homogeneous with the cable in order to avoid in particular a tangle basic telecommunication cables. The stuffing rod 15 can also contain one or more optical fiber. Telecommunication cables elementary and the stuffing rod are surrounded by a main metal screen 16 itself surrounded by a outer sheath 17. In the example illustrated where the cables of elementary telecommunications are in contact by the screens 8 it suffices to provide a single continuity wire 18 in contact with the main screen 16.

La figure 3 illustre un second mode de réalisation d'un câble de télécommunication élémentaire 1 comprenant comme précédemment deux quartes 2 s'étendant à l'intérieur d'une enveloppe 5 comprenant une gaine interne 6 recouverte d'un écran 8. Dans ce mode de réalisation l'écran 8 est constitué d'une seule couche métallique 10 enroulée en hélice sur la gaine interne 6. Un ruban de protection 19 est cette fois disposé autour de l'écran 10. Dans ce mode de réalisation le ruban de protection 19 est un ruban en polymère synthétique isolant disposé en long et ayant des bords 20 se chevauchant. Le ruban de protection 19 n'adhère donc pas à l'écran 8, il peut ainsi être retiré aisément lors du découpage de la seconde gaine 11 pour dénuder l'écran 8 et réaliser une connexion du câble de transmission élémentaire.Figure 3 illustrates a second embodiment an elementary telecommunication cable 1 comprising as before two quartes 2 extending to the interior of an envelope 5 comprising an internal sheath 6 covered with a screen 8. In this embodiment the screen 8 consists of a single metal layer 10 helically wound on the inner sheath 6. A ribbon of protection 19 is this time arranged around the screen 10. In this embodiment the protective tape 19 is an insulating synthetic polymer tape arranged lengthwise and having overlapping edges 20. The protective tape 19 therefore does not adhere to screen 8, it can thus be removed easily when cutting the second sheath 11 for strip the screen 8 and make a connection of the cable elementary transmission.

La figure 4 illustre un troisième mode de réalisation dans lequel le câble de transmission élémentaire comporte à nouveau comme précédemment deux quartes 2 s'étendant dans une enveloppe 5 comportant une gaine interne 6. De même que dans le premier mode de réalisation l'écran 8 est un ruban composite enroulé en hélice autour de la gaine interne 6. Dans ce troisième mode de réalisation, l'écran 8 est recouvert par un ruban de protection composite 21 comprenant une couche métallique 22 en contact avec la couche métallique 10 de l'écran 8 et une couche isolante 23. Le ruban de protection 21 est cette fois enroulé en hélice selon un pas inverse de l'enroulement en hélice de l'écran 8, les bords 24 étant disposés pour se chevaucher. Comme précédemment, le ruban de protection 21 est recouvert d'une seconde gaine 11 en matière isolante.Figure 4 illustrates a third embodiment in which the elementary transmission cable again includes two quartes 2 as before extending in an envelope 5 comprising a sheath internal 6. As in the first embodiment screen 8 is a composite ribbon wound helically around of the internal sheath 6. In this third embodiment, screen 8 is covered by a protective tape composite 21 comprising a metal layer 22 in contact with the metal layer 10 of the screen 8 and a layer insulating 23. The protective tape 21 is this time wound in a helix according to a reverse pitch of the winding in screen propeller 8, the edges 24 being arranged to be overlap. As before, the protective tape 21 is covered with a second sheath 11 made of insulating material.

Bien entendu l'invention n'est pas limitée aux modes de réalisation décrit et on peut y apporter des variantes de réalisation sans sortir du cadre de l'invention tel que défini par les revendications.Of course, the invention is not limited to embodiments described and we can make variant embodiments without departing from the scope of the invention as defined by the claims.

En particulier, le câble de télécommunication élémentaire selon l'invention peut être réalisé avec des paires en remplacement des quartes.In particular, the telecommunication cable elementary according to the invention can be achieved with pairs to replace the fourths.

Bien que l'écran 8 et le ruban de protection 19, 21 aient été illustrés selon trois réalisations différentes seulement, on peut varier les combinaisons de disposition et de structure de chacun de ces éléments du câble de télécommunication élémentaire, par exemple en disposant l'écran 8 en long associé à un ruban de protection enroulé en hélice ou lui-même disposé en long, etc.. de façon que les bords de l'écran et les bords du ruban de protection soient décalés les uns par rapport aux autres.Although screen 8 and protective tape 19, 21 were illustrated according to three different embodiments only, we can vary the layout combinations and structure of each of these elements of the cable basic telecommunications, for example by having 8 long screen associated with a rolled up protective tape in a helix or itself arranged lengthwise, etc. so that the edges of the screen and the edges of the protective tape are offset from each other.

Par ailleurs, le câble de télécommunication élémentaire selon l'invention peut être réalisé en prévoyant des moyens d'identification permettant une identification aisée des conducteurs au sein d'un câble de transmission élémentaire ou une identification d'un câble de transmission élémentaire au sein d'un câble composé, par exemple en prévoyant une gaine interne 6 en matière transparente et des couches isolantes 4 de différentes couleurs ou comprenant des filets de différentes couleur, et/ou en réalisant un marquage sur la seconde gaine 11 ou sur l'écran 8 sous forme d'un ou plusieurs filets ou bandes colorées extrudées, imprimées ou marquées à froid ou à chaud.In addition, the telecommunications cable elementary according to the invention can be achieved by providing means of identification allowing identification easy conductors within a transmission cable elementary or identification of a cable elementary transmission within a compound cable, by example by providing an internal sheath 6 in material transparent and insulating layers 4 of different colors or including nets of different colors, and / or by making a marking on the second sheath 11 or on screen 8 in the form of one or more nets or bands colored extruded, printed or cold stamped or hot.

Claims (8)

Câble de télécommunication élémentaire comprenant au moins une paire de fils conducteurs isolés (3) et torsadés, une gaine interne (6) en matériau isolant entourant les fils conducteurs isolés et torsadés, et un écran conducteur (8) en forme de ruban en contact avec la gaine interne, caractérisé en ce que l'écran (8) est fixé à la gaine interne par collage ou soudage.Basic telecommunication cable including at least one pair of insulated conductor wires (3) and twisted, an internal sheath (6) of insulating material surrounding the insulated and twisted conductors, and a conductive screen (8) in the form of a ribbon in contact with the internal sheath, characterized in that the screen (8) is fixed to the internal sheath by gluing or welding. Câble de télécommunication élémentaire selon la revendication 1, caractérisé en ce que l'écran (8) comporte une couche isolante (9) et une couche conductrice (10) fixées l'une à l'autre et en ce que l'écran est fixé à la gaine interne (6) par la couche isolante.Basic telecommunication cable according to claim 1, characterized in that the screen (8) has an insulating layer (9) and a conductive layer (10) fixed to each other and in that the screen is fixed to the internal sheath (6) by the insulating layer. Câble de télécommunication élémentaire selon la revendication 1, caractérisé en ce qu'il comporte une seconde gaine (11) disposée autour de l'écran et un ruban de protection (19, 21) disposé entre l'écran (8) et la seconde gaine (11) et ayant des bords (20, 24) se chevauchant.Basic telecommunication cable according to claim 1, characterized in that it comprises a second sheath (11) arranged around the screen and a ribbon protection (19, 21) disposed between the screen (8) and the second sheath (11) and having overlapping edges (20, 24). Câble de télécommunication élémentaire selon la revendication 3, caractérisé en ce que le ruban de protection (21) comporte une couche conductrice (22) et une couche isolante (23) fixées l'une à l'autre.Basic telecommunication cable according to claim 3, characterized in that the ribbon of protection (21) comprises a conductive layer (22) and a insulating layer (23) fixed to each other. Câble de télécommunication élémentaire selon la revendication 4, caractérisé en ce que la couche conductrice (22) du ruban de protection (21) est en contact avec la couche conductrice (10) de l'écran (8).Basic telecommunication cable according to claim 4, characterized in that the layer conductive (22) protective tape (21) is in contact with the conductive layer (10) of the screen (8). Câble de télécommunication élémentaire selon l'une des revendications 3 à 5, caractérisé en ce que les bords de l'écran (8) sont décalés par rapport aux bords du ruban de protection (19, 21).Basic telecommunication cable according to one of claims 3 to 5, characterized in that the edges of the screen (8) are offset from the edges of the protective tape (19, 21). Câble de télécommunication comprenant plusieurs câbles de télécommunication élémentaires (1) selon l'une des revendications 1 à 6, caractérisé en ce qu'il comporte un écran principal (16) ayant une face métallique interne entourant les câbles élémentaires (1) et une gaine externe (17) de protection et de maintien entourant l'écran principal (16).Telecommunication cable comprising several basic telecommunication cables (1) according to one of claims 1 to 6, characterized in that it has a main screen (16) having a metal face internal surrounding the elementary cables (1) and a sheath external (17) protection and support surrounding the screen main (16). Câble de télécommunication selon la revendication 7, caractérisé en ce qu'il comporte au moins un élément de bourrage (15).Telecommunication cable according to claim 7, characterized in that it comprises at least one stuffing element (15).
EP98401939A 1997-08-01 1998-07-29 Basic telecom cable and composite cable for high rate signals Withdrawn EP0895253A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9709883 1997-08-01
FR9709883A FR2766956B1 (en) 1997-08-01 1997-08-01 BASIC TELECOMMUNICATION CABLE AND COMPOUND CABLE FOR HIGH SPEED SIGNALS

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108986967A (en) * 2018-08-30 2018-12-11 江苏港通电缆有限公司 A kind of novel oval cable

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4510346A (en) * 1983-09-30 1985-04-09 At&T Bell Laboratories Shielded cable
US4596897A (en) * 1984-03-12 1986-06-24 Neptco Incorporated Electrical shielding tape with interrupted adhesive layer and shielded cable constructed therewith
FR2618939A1 (en) * 1987-07-31 1989-02-03 Gen Electric ASSEMBLED CABLE FOR ELECTRICAL SIGNAL TRANSMISSION SYSTEM

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4510346A (en) * 1983-09-30 1985-04-09 At&T Bell Laboratories Shielded cable
US4596897A (en) * 1984-03-12 1986-06-24 Neptco Incorporated Electrical shielding tape with interrupted adhesive layer and shielded cable constructed therewith
FR2618939A1 (en) * 1987-07-31 1989-02-03 Gen Electric ASSEMBLED CABLE FOR ELECTRICAL SIGNAL TRANSMISSION SYSTEM

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108986967A (en) * 2018-08-30 2018-12-11 江苏港通电缆有限公司 A kind of novel oval cable

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FR2766956B1 (en) 2002-10-25

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