EP0920035A1 - Datenübertragungskabel - Google Patents

Datenübertragungskabel Download PDF

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Publication number
EP0920035A1
EP0920035A1 EP98402828A EP98402828A EP0920035A1 EP 0920035 A1 EP0920035 A1 EP 0920035A1 EP 98402828 A EP98402828 A EP 98402828A EP 98402828 A EP98402828 A EP 98402828A EP 0920035 A1 EP0920035 A1 EP 0920035A1
Authority
EP
European Patent Office
Prior art keywords
conductors
unit
cable
sheath
materials
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Withdrawn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
EP98402828A
Other languages
English (en)
French (fr)
Inventor
Daniel Prudhon
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
Alcatel CIT SA
Alcatel 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
Application filed by Alcatel CIT SA, Alcatel SA filed Critical Alcatel CIT SA
Publication of EP0920035A1 publication Critical patent/EP0920035A1/de
Withdrawn legal-status Critical Current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
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/08—Flat or ribbon cables
    • H01B7/0876—Flat or ribbon cables comprising twisted pairs
    • 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

Definitions

  • the present invention relates to a data transmission cable. It relates to more particularly such a cable intended to be used in the computer field or in the field of telephony.
  • European patent EP-B-0.599.672 describes a high signal transmission cable frequency, comprising at least one unit of conductors, each unit comprising at least at least two sets of conductors, such as a quarter of twisted conductors, each conductor being insulated by a first insulating sheath, said unit, or several of said units, being surrounded by a second sheath consisting of a thin envelope extruded in insulating material, located in contact with the conductors of the assembly conductors without the latter being embedded in the sheath which it constitutes, said insulating material having both sufficient rigidity to maintain said conductors in a determined position during handling of said cable and sufficient elasticity to allow these manipulations.
  • the object of the present invention is to make a data transmission cable that solves the problem, in that it significantly reduces the difference in propagation time between conductors of said sets of conductors, i.e. generally obtaining a such difference in propagation time less than 2 ns / 100m.
  • the present invention provides for this purpose a data transmission cable comprising at least one unit of at least four conductors twisted in sets of conductors, which are fourths or pairs, each set of conductor being twisted with a different pitch from any other set of conductors and each conductor being insulated by means of an insulating sheath, said unit being enveloped by at least one assembly means, said cable being characterized in that the material used for the insulating sheath of any conductor of a given set of conductors has a relative dielectric constant different from the material used for the sheath insulating any conductor from another set of conductors, so that the difference in propagation time between the conductors of said set of conductors and the conductors of the other set of conductors be less than 2ns / 100m.
  • a preferred embodiment is such that said unit comprises eight conductors, under in the form of two quartes or four pairs.
  • Said cable according to the invention is advantageously such that said assembly means includes at least one sheath called unit sheath located in contact with the conductors sets of conductors.
  • the material used for the insulating sheath of each conductor of the first quad has a relative dielectric constant different from the material used for the sheath insulating of each conductor of the second quarter.
  • the material used for the insulating sheath of each conductor of the first pair has a different relative dielectric constant of the material used for the insulating sheath of each conductor of each of the three other pairs (respectively from the other pair).
  • the material used for the insulating sheath of any conductor of a set of conductors of a cable unit according to the invention chosen from materials having a relative dielectric constant suitable for making the cable according to the invention, a low molecular mobility within it.
  • This molecular mobility due to a more or less high polarity of the dipoles within the material according to the nature of a given material is a known datum, and it is represented by the value of tangent ⁇ . Typically this value is less than approximately 5.10 -4 at 100 kHz for a material used for the insulating sheath of a conductor of a set of conductors present in a cable unit according to the invention.
  • the insulating sheath of any conductor of a given set of conductors is therefore made of a given material, different from the insulation materials used for insulating sheaths of conductors of other sets of conductors: each set of conductors twisted according to a given pitch is associated one and only one insulating sheath material uniquely.
  • the materials each making the sheath insulating of all the insulating sheaths of the conductors of a set of conductors given are either different materials, chosen for their dielectric constants different, or materials of the same kind but having a constant different relative dielectric.
  • Said expanded materials have a cellular insulation material with a very low dielectric constant, of the order of approximately 1.3 to 1.4, such as cellular polyethylene, said cellular insulation material being surrounded by a layer or " protective polyethylene skin full of higher dielectric constant, of the order of about 2.0, and of a thickness of said layer typically of the order of 50 ⁇ m.
  • fluoropolymers such as PTFE (polytetrafluoroethylene), PCTFE (polychlorotrifluoroethylene), PVDF (polyvinylidene fluoride), PEP (poly (ethylene-propylene) perfluorinated), E.CTFE (ethylene.trichlorofluoroethylene) or ETFE (ethylene - PTFE copolymer), which have relative dielectric constants of the order of about 2 to 2.6 and on average tangent values ⁇ less than about 5.10 - 4 to 100 kHz.
  • PTFE polytetrafluoroethylene
  • PCTFE polychlorotrifluoroethylene
  • PVDF polyvinylidene fluoride
  • PEP poly (ethylene-propylene) perfluorinated
  • E.CTFE ethylene.trichlorofluoroethylene
  • ETFE ethylene - PTFE copolymer
  • the sets of conductors present in the cable unit according to the invention having the property of having a constant different dielectric for the sheath of each conductor of a set of conductors given in relation to any conductor from another set of conductors, must have practically the same impedance to be able to use any pair of said cable (alone or from a quarter) in the same subsequent application. It is why a logical consequence of the previous property is that the diameter of the insulating sheath of each conductor wire of a set of conductors of the unit cable according to the invention is different from the diameter of the insulating sheath of each wire of conductor of any other set of conductors of said unit.
  • the cable according to the invention comprises a unit of two quarters of conductors, these quarters being grouped inside a unit sheath surrounded by a metal screen, an outer casing being arranged around said unit of two quartes placed side by side.
  • a thread of continuity screen can be installed parallel to the conductors between the unit sheath and the screen.
  • the quarters are simply grouped together the inside of an envelope arranged around said unit of two quartes placed side by side rib, generally made up of a ribbon which acts as a screen.
  • a ribbon which acts as a screen.
  • the cable according to the invention comprises a unit of four pairs of conductors, these pairs being grouped together the inside of a unit sheath surrounded by a metal screen, an outer casing being arranged around said unit of four pairs put side by side as it is known to those skilled in the art.
  • Screen continuity wire can be installed in parallel to the conductors between the unit sheath and the screen.
  • the four pairs are simply grouped inside an envelope arranged around said unit of four pairs placed side by side, generally made up of a ribbon which acts as a screen.
  • a ribbon which acts as a screen.
  • the cable according to the invention comprises a unit of two pairs of conductors, these pairs being grouped together inside a unit sheath surrounded by a metal screen, an outer casing being arranged around said unit of two pairs placed side by side.
  • a screen continuity wire can be installed parallel to the conductors between the unit sheath and the screen.
  • the two pairs are simply grouped inside an envelope arranged around said unit of two pairs placed side by side, generally made up of a ribbon which acts as a screen.
  • a ribbon which acts as a screen.
  • the cable comprises, in addition to the unit (s) of conductor assemblies (e.g. quads), surrounded by thin insulating unit sheath envelope, other elements, insulating or not, all arranged inside a outer protective envelope, possibly preceded by a metal screen.
  • conductor assemblies e.g. quads
  • the possible unit sheath can be split longitudinally over all or part of its length.
  • FIGS. 1 and 2 show a flat cable 1 according to the invention.
  • Cable 1 has two quarters 2 and 2 '.
  • the fourth 2, respectively 2 ' consists of a twist of four solid copper conductors 3, the conductors each being insulated by a first insulating sheath 4, respectively 4 '.
  • the diameter of the solid conductors 3 is 0.51 mm ( ⁇ 3 ⁇ m), and the diameter of the conductors 3 insulated by means of the sheaths 4 is 1.2 mm.
  • the sheath 4 is made of solid polyethylene with a relative dielectric constant 2.28 and a tangent ⁇ equal to about 2.10 -4 at 100 kHz.
  • the quartering pitch is 41.8 mm.
  • the diameter of the solid conductors 3 is 0.51 mm ( ⁇ 3 ⁇ m), and the diameter of the conductors 3 insulated by means of the sheaths 4' is 1.15 mm.
  • the sheath 4 ′ is made of expanded polyethylene with a relative dielectric constant 2.26 and a tangent ⁇ equal to approximately 2.10 -4 at 100 kHz.
  • the quartering pitch is 33.0 mm.
  • Quarters 2 and 2 ' arranged side by side, are grouped in a unit of two quartes, referenced 5.
  • the unit 5 is surrounded by an insulating unit sheath 6, located directly in contact with the insulated conductors (3, 4; 3, 4 ').
  • Sheath 6, classic is consisting of a thin 0.25 to 1 mm thick polyethylene envelope. She can be ribbon or extruded.
  • a screen continuity wire 8 is disposed between the sheath 6 and the screen 7, parallel to the quarters 4 and 4 '.
  • the unit 5 of the two isolated and shielded quarters is wrapped in an outer support and protection envelope 9 made of PVC, extruded around the assembly.
  • the casing 9 gives the cable 1 an oblong structure of dimensions, approximately equal to 4.3 x 6.5 mm 2 .
  • the sheath 6 can be incised longitudinally (see Figure 2), as shown in 10.
  • the material constituting the sheath 6 is chosen so as not to adhere to the material constituting the sheaths 4 and 4 'of the conductors 3, always in order to facilitate the stripping of these last.
  • the cable 1 according to the invention can in particular be used in local networks computer, for example to connect the floor distributor and the user outlet.
  • the cable thus obtained according to the invention has a difference in propagation time less than 1 ns / 100m.
  • the comparative cable has a difference in propagation time of the order of 5 ns / 100m.
  • the cable produced according to the invention can be a cable comprising at least one unit of four pairs arranged at the vertices of a square, each pair being twisted and the set of the four pairs being twisted as is known to the man of the job.
  • This embodiment therefore comprises five different twisting steps, but obviously only four steps, or four insulation sheath materials of different conductor, are necessary to achieve the significant decrease in difference propagation time according to the invention.
  • the cable produced according to the invention can be a cable comprising at least a unit of two pairs next to each other, each pair being twisted and all of the two pairs being twisted as is known to those skilled in the art.
  • This embodiment therefore comprises three different twisting steps, but obviously only two steps, i.e. two different conductor insulation sheath materials, are necessary to achieve the noticeable decrease in time difference of propagation according to the invention.
  • a cable according to the invention in the case of the presence of a unit sheath insulating, possibly preceded by a metal screen, can have, in addition to the unit (s) of conductors surrounded by the unit sheath insulating according to the invention (thin envelope), other elements, insulating or not (such as for example solid conductors), all arranged inside an envelope of protection.
  • the screen and the outer protective casing are therefore not necessarily arranged directly in contact with the insulating unit sheath according to the invention, in the case of the presence of such an insulating unit sheath, and it is possible that a cable according to the invention does not include a screen and / or no envelope protective exterior.
  • a cable according to the invention can also have a dual structure (i.e. a structure divided into two units), typically flat or flattened.
  • the cable according to the invention is not necessarily intended to be used in the IT domain. It can for example be used in telephony.

Landscapes

  • Communication Cables (AREA)
EP98402828A 1997-11-27 1998-11-16 Datenübertragungskabel Withdrawn EP0920035A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9714910 1997-11-27
FR9714910A FR2771546B1 (fr) 1997-11-27 1997-11-27 Cable de transmission de donnees

Publications (1)

Publication Number Publication Date
EP0920035A1 true EP0920035A1 (de) 1999-06-02

Family

ID=9513862

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98402828A Withdrawn EP0920035A1 (de) 1997-11-27 1998-11-16 Datenübertragungskabel

Country Status (3)

Country Link
US (1) US6333465B1 (de)
EP (1) EP0920035A1 (de)
FR (1) FR2771546B1 (de)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR0200850A (pt) 2002-03-18 2003-11-11 Pirelli Telecomunicacoees Cabo Cabo de condutores metálicos trançados de superior desempenho elétrico para uso em sistemas digitais
KR100825408B1 (ko) * 2007-04-13 2008-04-29 엘에스전선 주식회사 고속 통신용 케이블
EP2194539A3 (de) * 2008-12-08 2014-01-08 Zellner GmbH Konfektionierbares Datenkabel
US8859902B2 (en) * 2009-12-10 2014-10-14 Sumitomo Electric Industries, Ltd. Multi-core cable
CN101866714B (zh) * 2010-05-25 2012-03-14 江苏通鼎光电科技有限公司 一种扁平形室内用数字通信电缆及其制造方法
JP2012079563A (ja) 2010-10-01 2012-04-19 Yazaki Corp 電線
US8858250B2 (en) 2012-09-19 2014-10-14 International Business Machines Corporation Electrical cable assembly
RU2543089C2 (ru) * 2013-06-05 2015-02-27 Федеральное государственное образовательное бюджетное учреждение высшего профессионального образования Московский технический университет связи и информатики (ФГОБУ ВПО МТУСИ) Экранированный симметричный четырехпарный кабель 7 категории с улучшенными характеристиками
RU2543510C2 (ru) * 2013-06-14 2015-03-10 Федеральное государственное образовательное бюджетное учреждение высшего профессионального образования Московский технический университет связи и информатики (ФГОБУ ВПО МТУСИ) Экранированный симметричный четырехпарный кабель
RU2565061C2 (ru) * 2014-01-28 2015-10-20 Федеральное государственное образовательное бюджетное учреждение высшего профессионального образования Московский технический университет связи и информатики (ФГОБУ ВПО МТУСИ) Экранированный комбинированный симметричный четырехпарный кабель 7 категории с экранированными оптическими модулями открытого типа

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0599672A1 (de) * 1992-11-23 1994-06-01 Filotex Hochfrequenzsignalübertragungskabel
US5483020A (en) * 1994-04-12 1996-01-09 W. L. Gore & Associates, Inc. Twin-ax cable
WO1997023883A1 (en) * 1995-12-22 1997-07-03 Amphenol Corporation Non-skew cable assembly and method of making the same

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
US4277642A (en) * 1978-09-15 1981-07-07 Western Electric Company, Inc. Cordage having a plurality of conductors in a partitioned jacket
FR2709860B1 (fr) * 1993-09-09 1995-10-20 Filotex Sa Câble de transmission haute fréquence.
US5519173A (en) * 1994-06-30 1996-05-21 Berk-Tek, Inc. High speed telecommunication cable
US5936205A (en) * 1994-11-10 1999-08-10 Alcatel Communication cable for use in a plenum
US5493071A (en) * 1994-11-10 1996-02-20 Berk-Tek, Inc. Communication cable for use in a plenum
US5619016A (en) * 1995-01-31 1997-04-08 Alcatel Na Cable Systems, Inc. Communication cable for use in a plenum
US5883334A (en) * 1995-06-13 1999-03-16 Alcatel Na Cable Systems, Inc. High speed telecommunication cable
US5739473A (en) * 1995-07-31 1998-04-14 Lucent Technologies Inc. Fire resistant cable for use in local area network
US5932847A (en) * 1996-05-10 1999-08-03 Remee Products Corporation Flame retardant plenum cable

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0599672A1 (de) * 1992-11-23 1994-06-01 Filotex Hochfrequenzsignalübertragungskabel
US5483020A (en) * 1994-04-12 1996-01-09 W. L. Gore & Associates, Inc. Twin-ax cable
WO1997023883A1 (en) * 1995-12-22 1997-07-03 Amphenol Corporation Non-skew cable assembly and method of making the same

Also Published As

Publication number Publication date
FR2771546A1 (fr) 1999-05-28
US6333465B1 (en) 2001-12-25
FR2771546B1 (fr) 1999-12-31

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