EP3246925A1 - Ligne de transmission de données à paire équilibrée - Google Patents

Ligne de transmission de données à paire équilibrée Download PDF

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Publication number
EP3246925A1
EP3246925A1 EP17382314.7A EP17382314A EP3246925A1 EP 3246925 A1 EP3246925 A1 EP 3246925A1 EP 17382314 A EP17382314 A EP 17382314A EP 3246925 A1 EP3246925 A1 EP 3246925A1
Authority
EP
European Patent Office
Prior art keywords
conductors
data transmission
transmission line
balanced pair
insulating covering
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Withdrawn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
EP17382314.7A
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German (de)
English (en)
Inventor
Josep Sanabra Jansa
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP17382314.7A priority Critical patent/EP3246925A1/fr
Publication of EP3246925A1 publication Critical patent/EP3246925A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/38—Insulated conductors or cables characterised by their form with arrangements for facilitating removal of insulation
    • 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
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/20—Cables having a multiplicity of coaxial lines

Definitions

  • This type of cables comprising at least one pair of conductors of which the electric signals may be out of phase with each other by 180o, is referred to and/or known in the prior art as balanced cables or alternatively as 'balanced pair cables'.
  • Said configuration of the balanced pair data transmission line according to the present invention in which the two conductors are covered by the same integral insulator is similar to the configuration that would result from combining the two independently insulated conductors and joining them together, the join zone between the independently insulated conductors having depressions, grooves or a reduction of the total outer dimension of the set of independently insulated conductors relative to the outer dimension of the insulating covering in the zones close to the respective axes which are perpendicular to the common axis between the respective centres of the conductors.
  • the balanced pair data transmission line according to the present invention also comprises at least four longitudinal apertures for propagating air, said apertures being arranged in pairs respectively on either side of the balanced pair data transmission line in the direction of the common axis between the centres of the electric conductors and between the outer surface of the insulating covering and a portion of the shielding means.
  • Said portions (-2000-, -2000'-) of insulating covering -20- each form surface depressions (-2001-, -2001'-) in the outer surface of said covering -20- close to the perpendicular line at the centre of the straight line between the two centres of said electric conductors (-200-, -200'-). Said perpendicular line would pass through said join (imaginary in Fig. 8 ) illustrated as -1000- in Fig. 1 .
  • This configuration according to the present invention allows clear identification of the position of the two electric conductors (-200-, -200'-) at the ends of the balanced pair data transmission line -2-. Furthermore, said configuration according to Fig. 8 assists the separation of the pair of conductors (-200-, -200'-) at the end of the data transmission line -2-. Said separation is necessary in order to house each conductor (-200-, -200'-) independently in the cavity where the respective contacts of an IDC (insulation-displacement connector) for a female RJ45 connector are found, or an IPC (insulation piercing connector), for a male RJ45 connector.
  • IDC insulation-displacement connector
  • IPC insulation piercing connector
  • each electric conductor (-200-, -200'-) can be housed in each respective cavity (-71-, -72-).
  • the aperture -4- may have various forms, such as rectangular (see Fig. 10 in a third embodiment), circular, elliptical or adapted to the contour of the conductor. It is advisable for the configuration thereof to allow the existence of some thickness of the insulating covering -20- on the surface of each conductor in order to keep said conductors insulated from any other nearby conductor element, even after the process of separating the pair of electric conductors into two units.
  • a longitudinal perforation -4- and at least one or two pre-cuts allows, if required, the two electric conductors (-200-, -200'-) to retain the insulating covering -20- around each conductor after the separation, protecting said conductors.
  • each conductor remains reasonably centred relative to the outer contours of the insulating covering -20-, helping guide said conductor to the connection terminal when the conductor is inserted into the cavity of said terminal.
  • the configuration described above will also apply both to pairs of conductors that are not shielded and to pairs that are shielded as illustrated in Fig. 11 according to a fourth embodiment.
  • the main difference between a non-shielded pair and a shielded pair, apart from the existence of the shield -5-, is that the shielding normally requires a greater thickness of insulator covering (and a lower dielectric constant) to maintain the impedance for conductors with the same cross section.
  • the shield -5- of the shielded pair must have been opened or removed beforehand in the zone where the separation of the two conductors of the pair will take place.
  • the shielding in this configuration according to the present invention may also allow the twisting operation to be eliminated. The usefulness of twisting is centred on keeping the two conductors together (if they are individual elements) in order to keep the impedance constant. The existence of the individual shield -5- will be sufficient to maintain the required levels of crosstalk.
  • Fig. 13 shows a sixth embodiment similar to that of Fig. 12 , that is, comprising electric conductors (-201-, -201'-) of elliptical cross section, allowing the total dimension (distance D 1 ) of the data transmission line -2- according to the present invention to be reduced along the common axis between the centres of the conductors (-201-, -201'-) compared with the total dimension (distance D) of the data transmission line -2- of the embodiment of Fig. 11 .
  • the shielding -5- normally requires a greater thickness of insulating covering (and a lower dielectric constant) to maintain the impedance for conductors with the same cross section.
  • one of the main problems of a data transmission cable of the prior art which comprises at least one balanced pair of electric conductors individually covered with their respective dielectric insulating material and arranged adjacently to one another longitudinally, is the possibility that the two conductors may separate at some point along the length of the pair. Said separation at some point along the length of the pair may cause an isolated variation in the impedance and, thus, an increase in return loss.
  • said small deviations of position in the case of non-circular electric conductors are usually more likely to occur and involve more significant variations in the transmission behaviour of the cable than for relative variations of position between electric conductors of circular cross section.
  • the isolated separations between the electric conductors of a particular pair may also be produced repeatedly at different points along the same pair, causing significant increases in return loss and, in addition, increases in attenuation, lowering the performance of the pair and of the cable.
  • Fig. 17 is a view in cross section of the embodiment of the data transmission line -2- of Fig. 10 in which the thickness (d 1 ') of the insulating covering -20- is reduced in the direction of the common axis between the centres of the electric conductors (-200-, -200'-), compared with the thickness (d 1 ) of the embodiment of Fig. 10 .
  • the total widthways dimension (d 2 ') of the data transmission line -2- of Fig. 17 has been reduced compared with the total widthways dimension (d 2 ) of the data transmission line -2- of Fig. 10 .
  • Fig. 18 is a view in cross section of the embodiment of the data transmission line -2- of Fig. 12 in which the thickness (d 5 ') of the insulating covering -20- is reduced in the direction perpendicular to the common axis between the centres of the electric conductors (-201-, -201'-), compared with the thickness (d 5 ) of the embodiment of Fig. 12 .
  • the total upward dimension (d 7 ') of the data transmission line -2- of Fig. 18 has been reduced compared with the total upward dimension (d 7 ) of the data transmission line -2- of Fig. 12 .
  • Fig. 21 is a view in cross section of the embodiment of the data transmission line -2- of Fig. 11 , additionally comprising four longitudinal apertures (-61-, -61'-, -62-, -62'-) for propagating air arranged in pairs on either side of said line -2- in the direction of the common axis between the centres of the electric conductors (-200-, -200'-) and between the outer surface of the insulating covering -20- and a portion of the shielding means -5-.
  • the total widthways dimension (D") of the data transmission line -2- of Fig. 21 is reduced compared with the total widthways dimension (D) of the data transmission line -2- of Fig. 11 .
  • Fig. 23 is a view in cross section of the embodiment of the data transmission line -2- of Fig. 13 , additionally comprising four longitudinal apertures (-61-, -61'-, -62-, -62'-) for propagating air arranged in pairs on either side respectively of said data transmission line -2- in the direction of the common axis between the centres of the electric conductors (-201-, -201'-) and between the outer surface of the insulating covering -20- and a portion of the shielding means -5-.
  • the total widthways dimension (D 1 ") of the data transmission line -2- of Fig. 23 is reduced compared with the total widthways dimension (D 1 ) of the data transmission line -2- of Fig. 13 .
  • the two conductors of the optimised balanced pair data transmission line according to the present invention are characterised by having elongate shapes, which may be the same or different, with substantially parallel larger axes and smaller axes with substantially aligned axes, and by having opposite faces of which the radii of curvature will be greater than the radius of the circle of the same area as the respective conductor. This will produce a greater concentration of the electric field lines, which will produce less insertion loss and less crosstalk.
  • the insulating covering -20- may be prepared with a polymer of low dielectric constant (to minimise insertion loss or attenuation), which may be solid or cellular, and which includes air bubbles with the object of further reducing the dielectric constant as air is characterised by a dielectric constant (of close to 1) which is less than that of the polymers used for this application.
  • a dielectric constant of close to 1
  • the insulating covering -20- according to the present invention will have a constant thickness around the conductor.
  • a data transmission line -2- according to the present invention may be comprised of other lines -2- of the same type inside a data transmission cable, the most common configuration being that with four balanced pair data transmission lines -2- according to the present invention, which is equivalent to four conventional pairs according to the prior art.
  • a central insulator may be used to position each balanced data transmission line -2- appropriately and to reduce the crosstalk therebetween.
  • the shielding means or shield -5- described in the above embodiments may be formed of a conductive tape, normally of aluminium, on a tape made of a dielectric material, such as polyester, and may also include a drain wire to improve the conductivity of the shielding.
  • the outer shielding may consist of a copper mesh.
  • shielding may be provided for the set of data transmission lines -2- according to the present invention comprised within the same data transmission cable, by using a conductive tape, normally of aluminium, on a tape of dielectric material, such as polyester, which surrounds, with some overlap, each of the data transmission lines -2-.
  • the data transmission line -2- according to the present invention will optimise the above-mentioned parameters at frequencies from 1 MHz to 2 GHz or more depending on the application of the cable which will comprise at least said data transmission line -2- according to the present invention.
  • the data transmission line -2- may comprise said conductors arranged in parallel inside said insulating covering -20-.
  • said conductors may be twisted together uniformly along the length of said conductors inside said insulating covering -20-.
  • a cable comprises various data transmission lines according to the present invention
  • colours to distinguish each pair of conductors of each data transmission line according to the present invention.
  • the usual coding is for one of the conductors of the pair to be white while the other is blue, green, orange or brown.
  • the process of co-extruding the two conductors may include an injection nozzle for white polymer at one end of the pair and another nozzle at the other end with the desired colour.
  • An alternative is to extrude the entire pair in white and to add a subsequent operation of painting the other colour.
EP17382314.7A 2017-05-31 2017-05-31 Ligne de transmission de données à paire équilibrée Withdrawn EP3246925A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17382314.7A EP3246925A1 (fr) 2017-05-31 2017-05-31 Ligne de transmission de données à paire équilibrée

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17382314.7A EP3246925A1 (fr) 2017-05-31 2017-05-31 Ligne de transmission de données à paire équilibrée

Publications (1)

Publication Number Publication Date
EP3246925A1 true EP3246925A1 (fr) 2017-11-22

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EP17382314.7A Withdrawn EP3246925A1 (fr) 2017-05-31 2017-05-31 Ligne de transmission de données à paire équilibrée

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EP (1) EP3246925A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020053130A (ja) * 2018-09-25 2020-04-02 株式会社オートネットワーク技術研究所 ワイヤハーネス
CN113936845A (zh) * 2021-11-26 2022-01-14 远东电缆有限公司 异型高强仪表电缆及其制造工艺

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB469213A (en) * 1935-09-06 1937-07-21 Us Rubber Prod Inc Improvements in electric cables and methods and apparatus for making them
JPS555473U (fr) * 1978-06-27 1980-01-14
GB2275127A (en) * 1993-02-05 1994-08-17 Rich City Limited Electric cable
US5486654A (en) * 1993-09-06 1996-01-23 Filotex Easy-strip cable
US5606151A (en) 1993-03-17 1997-02-25 Belden Wire & Cable Company Twisted parallel cable
US7737358B2 (en) 2007-04-12 2010-06-15 Commscope, Inc. Of North Carolina Data transmission cable pairs and cables and methods for forming the same
US9418775B2 (en) 2008-03-19 2016-08-16 Commscope, Inc. Of North Carolina Separator tape for twisted pair in LAN cable

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB469213A (en) * 1935-09-06 1937-07-21 Us Rubber Prod Inc Improvements in electric cables and methods and apparatus for making them
JPS555473U (fr) * 1978-06-27 1980-01-14
GB2275127A (en) * 1993-02-05 1994-08-17 Rich City Limited Electric cable
US5606151A (en) 1993-03-17 1997-02-25 Belden Wire & Cable Company Twisted parallel cable
US5486654A (en) * 1993-09-06 1996-01-23 Filotex Easy-strip cable
US7737358B2 (en) 2007-04-12 2010-06-15 Commscope, Inc. Of North Carolina Data transmission cable pairs and cables and methods for forming the same
US9418775B2 (en) 2008-03-19 2016-08-16 Commscope, Inc. Of North Carolina Separator tape for twisted pair in LAN cable

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020053130A (ja) * 2018-09-25 2020-04-02 株式会社オートネットワーク技術研究所 ワイヤハーネス
WO2020066588A1 (fr) * 2018-09-25 2020-04-02 株式会社オートネットワーク技術研究所 Faisceau de fils
CN112740341A (zh) * 2018-09-25 2021-04-30 株式会社自动网络技术研究所 线束
CN113936845A (zh) * 2021-11-26 2022-01-14 远东电缆有限公司 异型高强仪表电缆及其制造工艺
CN113936845B (zh) * 2021-11-26 2023-10-10 远东电缆有限公司 异型高强仪表电缆及其制造工艺

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