EP0559941A1 - Câble de transmission de données, et procédé de fabrication d'un tel câble - Google Patents

Câble de transmission de données, et procédé de fabrication d'un tel câble Download PDF

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Publication number
EP0559941A1
EP0559941A1 EP92104219A EP92104219A EP0559941A1 EP 0559941 A1 EP0559941 A1 EP 0559941A1 EP 92104219 A EP92104219 A EP 92104219A EP 92104219 A EP92104219 A EP 92104219A EP 0559941 A1 EP0559941 A1 EP 0559941A1
Authority
EP
European Patent Office
Prior art keywords
data transmission
transmission cable
wires
khz
cable according
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Withdrawn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
EP92104219A
Other languages
German (de)
English (en)
Inventor
Marco Glaus
Beat Schmucki
Werner Aeschlimann
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.)
Daetwyler IT Infra AG
Original Assignee
Daetwyler AG Kabel und Systeme
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 Daetwyler AG Kabel und Systeme filed Critical Daetwyler AG Kabel und Systeme
Priority to EP92104219A priority Critical patent/EP0559941A1/fr
Publication of EP0559941A1 publication Critical patent/EP0559941A1/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Withdrawn legal-status Critical Current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
    • H01B11/005—Quad 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 invention relates to a data transmission cable to ensure the 150 ohm impedance standard, consisting of 4 wires, each having a conductor and an insulation enclosing the respective conductor in the longitudinal direction, the 4 wires in turn being surrounded by a common, preferably foil / braid-like shield, and insulation that completely surrounds the foil / braid-like shielding.
  • the invention relates to a method for producing an above-mentioned data transmission cable.
  • So-called data transmission cables of the IBM world are subject to their own laws.
  • the so-called data transmission cables of the IBM world of type 1 which correspond to the so-called 150 ohm impedance standard, have to meet the most exacting manufacturing tolerances in order to achieve the specifically specified values in relation to the characteristic impedance, damping or so-called near-end crosstalk attenuation etc. can.
  • the IBM LAN cable of type 1 is therefore known as a data transmission cable to ensure the 150 ohm impedance standard. Only with this has it been possible to meet the required values, particularly with regard to near-end crosstalk attenuation.
  • This known cable consists of two pairs of wires, the pairs preferably being twisted together. The pairs, so-called PIMPF pairs, are shielded from one another with the aid of a shielding film. With the help of this structure, it is possible with this known data transmission cable to ensure the desired values for the near-end crosstalk attenuation.
  • the four wires are surrounded by a foil / braid-like shield (mostly made of tinned copper braid).
  • a foil / braid-like shield mostly made of tinned copper braid.
  • such a known cable has the following disadvantage: the respective pairs of wires lie - seen in the cross section of the data transmission cable - side by side. Due to the packaging pressure caused by the production, which is additionally exerted in particular by the insulation that completely surrounds the complete data transmission cable and the braid-like shielding the wire pairs are offset from one another in the cross section of the data transmission cable in such a way that overall they run closer together than directly. Because of this compulsory arrangement of the wires within the data transmission cable, the interior of the data transmission cable is not used optimally. An oval cross section of the data transmission cable is the result of the arrangement of the individual components within the data transmission cable determined by the action of external forces.
  • the aim of the invention is to provide a data transmission cable to ensure the 150 ohm impedance standard, in which the above disadvantages in the prior art are avoided.
  • This goal is achieved in a generic data transmission cable in that the four wires are stranded together in concentric positions to the longitudinal axis of the cable in the manner of a star quad.
  • this goal is achieved in a generic method for producing a data transmission cable by twisting four wires running parallel to one another about the longitudinal axis of the cable to form a star quad.
  • the four wires are arranged within the data transmission cable with optimal use of the space available to them. Due to the stranding like a star quad, the surfaces lie the individual insulation of the four wires closely together. In this way they form the spatially least complex solution of an arrangement of four wires while at the same time achieving the electrical specifications and values as with a conventional data transmission cable of the 150 ohm impedance standard.
  • This arrangement of the four wires also provides the most resistant and stable form of wire arrangement with respect to external pressurization. Since the four wires run essentially symmetrically around the longitudinal axis of the cable, each with the same own cross section, the data transmission cable has a circular cross section.
  • this structure for a data transmission cable of the 150 ohm impedance standard has the advantage that no spirals occur when the cable is pulled in and the assembly process - unlike in the prior art - is not inhibited.
  • the four wires for forming the star quad are twisted together in such a way that their respective absolute pitch angle relative to the longitudinal axis of the cable is identical at identical locations in the longitudinal section of the cable (claim 2).
  • Such a twist of the individual wires and among themselves leads to the greatest possible flexibility of the cable and good electrical decoupling of the wires from one another.
  • the requirement for the identity of the respective absolute pitch angle of each of the four wires relative to the longitudinal axis of the data transmission cable takes account of the need for high symmetry of the wires arranged within the wire transmission. This automatically ensures the tightest possible packing of the wires within the cable.
  • their resistance in Optimized with regard to changes in the wire arrangements within the cable due to external force.
  • a particularly preferred embodiment of the data transmission cable according to the invention is characterized in that the conductors of the four wires form corner points of a square in the cross section of the cable (claim 3).
  • optimal field extinction can be achieved, which is due to the fact that the cos ⁇ factor relevant for field extinction can become 1.
  • this optimal arrangement of the wires ensures that the distance which is decisive for their mutual electromagnetic influence is always the same. The leading and returning waves within the wires cancel each other out, so to speak.
  • this ensures that the square arrangement of the four cores with respect to one another which is optimal in cross section of the cable is maintained. This in turn leads to the previously mentioned advantages in terms of field extinction.
  • the four wires are surrounded by a shielding film which surrounds them in the longitudinal direction (claim 4).
  • the shielding foil surrounds the four wires in total around their total outer circumference, which is approximately concentric with the longitudinal axis of the cable.
  • the arrangement of the shielding foil according to the invention within the data transmission cable means that the available space is used even more optimally. In this way, adjacent shielding film sections, which in the known data transmission cable bring about an additional, undesirable distance between the wire pairs, are eliminated.
  • This embodiment according to the invention has advantages in terms of the simplicity of manufacturing the entire data transmission cable.
  • the characteristic impedance at 9.6 kHz is 243-297 ohms, at 38.4 kHz 166.5-203.5 ohms and at 3-20 MHz 135-165 ohms (claim 5).
  • the near-end crosstalk attenuation is for 9.6 kHz ⁇ + 80 dB, for 38.4 kHz ⁇ + 75 dB, for 3-5 MHz ⁇ + 58 dB and for 12-20 MHz ⁇ + 40 dB ).
  • test voltage for the latter values advantageously has a value of 900 volts and 50 Hz at 1 minute (claim 8). This fully takes into account the electrical specifications and values of the 150 ohm impedance standard.
  • Fig. 1 shows a data transmission cable 1 in cross section.
  • This data transmission cable 1 consists of the following components: Four wires 2 and 3 are twisted or stranded together in such a way that one pair of wires 2, 3 is arranged opposite one another. Such wire pairs 2 and 3 are used in a known manner to transport a leading and a returning shaft during data transmission.
  • One core 2 of the exemplary embodiment according to FIG. 1 is used, for example, to transport the leading shaft, whereas, on the other hand, the returning shaft is transported through the opposite core 3.
  • each wire 2, 3 consists of a metallic conductor 4, which is used to transmit electrical charge carriers. Furthermore, the wire 2, 3 is known to have an insulating sleeve 5 surrounding the conductor 4. The wires 2, 3 are arranged concentrically around a central longitudinal axis 6 of the data transmission cable 1. Due to external force, which will be explained in the following on the basis of the components causing them, and due to mutual twisting, the wires 2, 3 with surface sections of their respective insulating sleeves 5 abut one another in the cross section of FIG. 1.
  • a shielding film 7 is wound around the four wires 2, 3 on the outside and serves to shield against high frequencies.
  • This screen film 7 is furthermore completely surrounded or wrapped by a total screen 8, in particular made of copper braid.
  • This overall screen 8 is used to shield against low frequencies.
  • the entire screen 8 is completely enclosed by a preferably flexible insulation 9.
  • Fig. 2 the stranding of the wires 2, 3 is shown in more detail. It can be seen that the wires 2, 3 are twisted together in such a way that their absolute amount of the pitch angle is identical to the longitudinal axis 6 of the data transmission cable 1 shown only in FIG. 1 at identical locations in the longitudinal section of the data transmission cable 1.
  • stranding with a very short lay length is preferred. This leads to the fact that the previously desired, square arrangement of the conductors 4 in the cross section of the data transmission cable 1 relative to one another can hardly be changed by external force.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Communication Cables (AREA)
EP92104219A 1992-03-11 1992-03-11 Câble de transmission de données, et procédé de fabrication d'un tel câble Withdrawn EP0559941A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP92104219A EP0559941A1 (fr) 1992-03-11 1992-03-11 Câble de transmission de données, et procédé de fabrication d'un tel câble

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP92104219A EP0559941A1 (fr) 1992-03-11 1992-03-11 Câble de transmission de données, et procédé de fabrication d'un tel câble

Publications (1)

Publication Number Publication Date
EP0559941A1 true EP0559941A1 (fr) 1993-09-15

Family

ID=8209426

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92104219A Withdrawn EP0559941A1 (fr) 1992-03-11 1992-03-11 Câble de transmission de données, et procédé de fabrication d'un tel câble

Country Status (1)

Country Link
EP (1) EP0559941A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2321976A (en) * 1995-02-02 1998-08-12 Gen Electric Light beam spreader
EP1191549A2 (fr) * 2000-09-23 2002-03-27 Nexans Câble pour installations électriques

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3209064A (en) * 1961-10-19 1965-09-28 Communications Patents Ltd Signal transmission electric cables
DE1490692A1 (de) * 1964-10-27 1969-07-03 Siemens Ag Aus einem einzigen Verseilelement mit einer einzigen Drallaenge bestehendes symmetrisches Kabel,insbesondere flexibles Traegerfrequenzkabel
DE2654846A1 (de) * 1976-12-03 1978-06-08 Hellige Gmbh Abgeschirmte ein- oder mehradrige elektrische leitung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3209064A (en) * 1961-10-19 1965-09-28 Communications Patents Ltd Signal transmission electric cables
DE1490692A1 (de) * 1964-10-27 1969-07-03 Siemens Ag Aus einem einzigen Verseilelement mit einer einzigen Drallaenge bestehendes symmetrisches Kabel,insbesondere flexibles Traegerfrequenzkabel
DE2654846A1 (de) * 1976-12-03 1978-06-08 Hellige Gmbh Abgeschirmte ein- oder mehradrige elektrische leitung

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2321976A (en) * 1995-02-02 1998-08-12 Gen Electric Light beam spreader
GB2321976B (en) * 1995-02-02 1999-09-01 Gen Electric Light beam spreader
EP1191549A2 (fr) * 2000-09-23 2002-03-27 Nexans Câble pour installations électriques
EP1191549A3 (fr) * 2000-09-23 2003-02-05 Nexans Câble pour installations électriques
US6563052B2 (en) 2000-09-23 2003-05-13 Nexans Electric installation cable

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