EP3350813A1 - Câble de données pour transferts de données haute vitesse - Google Patents

Câble de données pour transferts de données haute vitesse

Info

Publication number
EP3350813A1
EP3350813A1 EP16793779.6A EP16793779A EP3350813A1 EP 3350813 A1 EP3350813 A1 EP 3350813A1 EP 16793779 A EP16793779 A EP 16793779A EP 3350813 A1 EP3350813 A1 EP 3350813A1
Authority
EP
European Patent Office
Prior art keywords
pair
data cable
cable according
core
shielding
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Withdrawn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
EP16793779.6A
Other languages
German (de)
English (en)
Inventor
Melanie Dettmer
Bernd Janssen
Frank Jakobs
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.)
Leoni Kabel GmbH
Original Assignee
Leoni Kabel GmbH
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 Leoni Kabel GmbH filed Critical Leoni Kabel GmbH
Publication of EP3350813A1 publication Critical patent/EP3350813A1/fr
Withdrawn legal-status Critical Current

Links

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
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • 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
    • H01B11/203—Cables having a multiplicity of coaxial lines forming a flat arrangement
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/002—Pair constructions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1834—Construction of the insulation between the conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H01B13/14—Insulating conductors or cables by extrusion
    • H01B13/141—Insulating conductors or cables by extrusion of two or more insulating layers
    • 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
    • H01B7/02—Disposition of insulation
    • H01B7/0208—Cables with several layers of insulating material
    • H01B7/0216—Two layers
    • 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
    • H01B7/02—Disposition of insulation
    • H01B7/0275—Disposition of insulation comprising one or more extruded layers 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/443—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds
    • H01B3/445—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds from vinylfluorides or other fluoroethylenic compounds

Definitions

  • the invention relates to a data cable for high-speed data transmission with at least one wire pair of two extending in the longitudinal direction of cores, which are surrounded by a Paartung.
  • Such a data cable is offered at the time of filing by the applicant under the trade name "ParaLink 23.”
  • Such data cables are used in particular for high-speed transmission of signals between computers, for example in data centers.
  • a respective core here consists of the actual conductor, such as a solid conductor wire or a stranded wire, which is surrounded in each case by an insulation.
  • the wire pair of a respective data line is surrounded by the (pair-) shielding.
  • the data cables typically have a plurality of such screened wire pairs, which form a line core and which are surrounded by a common outer screen and a common cable sheath. Such data cables are used for high-speed data connections and are larger for data rates
  • the outer screen is important for the electromagnetic compatibility (EMC) as well as for the electromagnetic interference (EMI) with the environment.
  • EMC electromagnetic compatibility
  • EMI electromagnetic interference
  • the respective pair shield determines the symmetry and the signal properties of a respective pair of wires. In this case, a high symmetry of the pair screen is important for undisturbed data transmission.
  • Such data cables are typically so-called symmetrical data lines, in which the signal is transmitted via one wire and the inverted signal is transmitted via the other wire.
  • the differential signal component between these two signals is evaluated so that external effects that have an effect on both signals are eliminated.
  • Such data cables are often connected pre-assembled to plugs.
  • the connectors are often designed as a so-called small-form-pluggable connector, short SFP connector.
  • SFP +, CXP or QSFP connectors which are also referred to as SFP28 or QSFP28 in a design of the data cable for 25 GBit / s.
  • These connectors have special connector housing, as for example from WO
  • the pair shield of a respective pair of wires is - as can be seen for example from EP 2,112,669 A2 - often formed as a longitudinally folded screen foil.
  • the screen foil is therefore folded in a longitudinal direction of the cable running around the pair of wires, wherein the opposite outer side areas of the screen foil overlap in a longitudinally extending overlap area.
  • a dielectric intermediate film made of plastic, in particular a polyester film is spun between the shielding film and the wire pair.
  • the shielding foil used for the pair shielding is a multi-layered pair shielding comprising at least one conductive (metal) layer and one insulating carrier layer.
  • the conductive layer an aluminum layer is usually used, and as the insulating base layer, a PET film is used.
  • the PET film is formed as a carrier on which the metallic coating is applied to form the conductive layer.
  • the screen foil is often preferably attached as a longitudinally folded screen foil.
  • a signal cable for a high-frequency signal transmission in which the signal conductor is designed as a stranded conductor with a varying lay length.
  • the signal cable furthermore has a shielding braid, with individual braid strands of the shielding braid being wound with a varying lay length here as well.
  • DE 103 15 609 A1 discloses a data cable for high-frequency data transmission, in which a wire pair is surrounded by a pair shield formed as a screen film. In addition, an intermediate foil is spun around the wire pair.
  • the object of the invention is to specify a high-speed data cable with good transmission properties even at high transmission rates and high transmission frequencies.
  • the object is achieved according to the invention by a data cable having the features of claim 1 and by a method for producing such a data cable having the features of claim 16.
  • the data cable is designed for high-speed data transmission and has at least one wire pair of two wires extending in the longitudinal direction.
  • a respective core is formed by a signal conductor and a surrounding this core insulation.
  • the pair of wires is surrounded by a pair shield formed in particular by a screen foil, wherein between the
  • intermediate sheath is generally understood to mean an element that completely surrounds the wire pair and that is not formed as a wound or folded film.
  • this refinement is based on the consideration that such an intermediate layer between the pair of conductors and the pair shielding is particularly advantageous, in particular in the case of high-speed data transmissions, for example in a frequency range of> 10 GHz.
  • high-speed data transmissions namely a rewinding of the wire pair with a shielding foil is no longer readily possible, since such a spinning due to construction results in a series resonance, which limits the frequency range for data transmission depending on the size.
  • a longitudinally folded shielding foil in particular an AL-PET foil, is usually applied.
  • this film folding has the disadvantage that smallest asymmetries due to only low attenuation of the common mode signal greatly increase the so-called mode conversion and thus that burglaries in the
  • the embodiment of the invention is based on the consideration that such a structure with a braided polyester intermediate film has the disadvantage that polyester is not the first choice for high-frequency applications.
  • Another disadvantage is that the film is very thin in relation to the core wall thickness, whereby the signal conductors (usually solid solid wires) are strongly coupled to the screen (pair shielding).
  • the signal conductors usually solid solid wires
  • a negative effect on the frequency response is also due to the fact that the interfering common-mode signal has a higher propagation speed compared to the push-pull signal (useful signal) [ie V ScC 2i>
  • the entire shielded pair of wires is mechanically stable, which is especially in the assembly of a cable with several such shielded wire pairs advantage. These are usually stranded together. Even with a later installation and handling of the cable, the data cable is characterized by greater stability.
  • the intermediate jacket is formed as an extruded intermediate jacket. In the manufacture, therefore, the two wires of the Wire pair fed together an extruder and the intermediate jacket is extruded onto the wire pair.
  • the intermediate shell is extruded in the manner of a tubular structure on the pair of wires.
  • the gusset area between the two wires is therefore - as in the conventionally used intermediate foil - free of material.
  • the intermediate casing consists of a suitable material for high-frequency applications and consists in particular of a plastic solid material.
  • a plastic solid material Under solid material is understood here that the jacket is solid from the material and, for example, is not designed as a foamed plastic or as a plastic with air inclusions.
  • foamed or air-entrapped plastic in particular referred to as so-called cell plastic, is preferably used for the respective core insulation of the respective core.
  • the material used for the intermediate jacket is either PE, PP, FEP, PTFE or PFA.
  • PE is used.
  • the intermediate sheath further preferably has a wall thickness in the range of 0.1 mm to 0.35 mm and in particular of about 0.2 mm.
  • a particular advantage of this compared to conventional thin polyester films thick wall thickness is particularly seen in the improved mechanical stability.
  • the wall thickness of the core insulation can be reduced by this measure, whereby the individual signal conductors move closer to each other.
  • the distance of the signal wires to the shield increases.
  • the signal conductors are thereby more strongly coupled to one another, since the pair shielding is located further away from the signal conductors than the spacing of the signal conductors from one another. Asymmetries have less impact, improving fashion conversion performance is. Also, simulations have shown that with this geometry (the signal conductors are closer together under the pair shield) the insertion loss is greatly improved.
  • the wall thickness preferably depends on the diameter of the respective signal conductor. Namely, the wall thickness of the intermediate jacket increases with increasing diameter of the signal conductors.
  • the diameter of the signal conductors is generally preferably in the range between 0.2 mm to 0.6 mm.
  • the ratio of the wall thickness to the diameter of the signal conductor is approximately in the range of 0.4 to 0.6.
  • the core diameter of a respective core also varies accordingly, the core diameter being in the range between 0.5 mm to 1.2 mm. Again, the core diameter increases with increasing
  • the core diameter is in particular in the range of 2 to 2.5 times the diameter of the signal conductor.
  • the core diameter is also in the lower region of, for example, 0.5 mm and the wall thickness of the intermediate sheath in the range of about 0.1 mm.
  • the core diameter is preferably also in the upper region at about 1, 2 mm and the wall thickness of the intermediate sheath at about 0.35 mm.
  • the core insulation further expediently consists of a cell plastic, the cell plastic in this case preferably having a gas content in the range of 20% by volume - 50% by volume or up to 60% by volume.
  • the material used for the cell plastic here is in particular PE, PP, FEP or ePTFE used.
  • the shielded pair of wires are, in particular, cores routed parallel to one another, that is, they are not stranded with one another.
  • the pair shielding is preferably a longitudinally folded shielding foil, in particular a metal-clad plastic foil (AL-PET).
  • A-PET metal-clad plastic foil
  • the pair shield is formed in particular by this metal-laminated plastic film.
  • one and preferably several shielded wire pairs are connected to a common cable core.
  • This cable core is surrounded by a common cable sheath.
  • the cable core is initially surrounded by an overall shield, which is then surrounded by the cable sheath.
  • the plurality of shielded wire pairs are stranded together, so that the cable core is formed by a Verseilverbund several shielded wire pairs.
  • FIGS. show:
  • Fig. 1 is a cross-sectional view of a shielded wire pair
  • Fig. 2 is a cross-sectional view of a data cable having a plurality of such wire pairs
  • the shielded pair of wires 2 shown in FIG. 1 has two wires 4. These are each formed by a central signal conductor 6 and a surrounding this core insulation 8.
  • the signal conductor 6 is preferably formed by a solid wire, in particular silver-plated copper wire. It has a diameter d1. This is in this case, for example, at 0.4mm.
  • the wire 4 has a core diameter d2, which in the exemplary embodiment at about 1.0 mm is thus about 2.5 times the diameter d1 of the signal conductor 6.
  • the core insulation consists of a so-called cellular plastic, which thus has a comparatively high proportion of gas in the range of 20 vol .-%, in contrast to a solid solid material.
  • the two wires 4 are directly adjacent to each other and touch. The distance between the two wires a therefore corresponds to twice the thickness of the core insulation 8 and is therefore present at 0.6 mm.
  • the two wires 4 are in particular directly surrounded by an intermediate jacket 10.
  • This preferably consists of a solid plastic material so in contrast to the wire insulation not from a cellular plastic or other foamed or expanded plastic. It is designed as an extruded jacket, that is applied to the two wires 4 by an extrusion process.
  • the intermediate casing 10 is a tubular structure, which thus has circumferentially and around the two wires 4 a constant wall thickness w. There are therefore formed within the intermediate sheath 10 between the two wires 4 free gusset areas in which no plastic material is present.
  • the wall thickness w of the intermediate sheath is in the selected embodiment at about 0.2 mm.
  • the intermediate jacket 10 is in turn surrounded by a shielding film 12, which rests directly on the intermediate jacket 10 and forms a pair shielding.
  • the shielding film 12 is preferably designed as a longitudinally folded shielding film 12 and therefore not wound.
  • the screen film 12 is a conventional screen film, especially an aluminum-laminated (plastic) film. This typically has a film thickness of typically 10 ⁇ to a few 100 ⁇ on.
  • the screen film 12 may be a single-layer or even a double-layered screen film (metal coating applied to one or both sides of the carrier film).
  • the shielded pair of wires 2 shown in FIG. 1 is expediently finally formed by the elements shown in the figure 1. In the present case therefore no heddle wire is provided. Alternatively, such may be arranged.
  • Such a bypassing wire can, for example, be mounted to extend between the intermediate casing 10 and the shielding film 1 2 or also on the outside of the shielding film 12.
  • the fill-in wire is used in a plug connection area for the electrical contacting of the screen foil 12.
  • Cores 4 is wound, waived. This is replaced by the extruded intermediate jacket 10 with the comparatively large wall thickness w in comparison to conventional shielded wire pairs.
  • a particular advantage here is to be seen in the fact that the distance between the signal conductor 6 to the screen foil 12 is quasi enlarged and therefore the two signal conductors 6 - relatively closer - closer together. Compared to conventional shielded wire pairs 2 so the distance a is reduced. Overall, this also reduces the length-to-width ratio, so that overall the shielded wire pair 2 is rounded in comparison to conventional shielded wire pairs. This is for a later assembly of advantage.
  • the thickness of the core insulation 8 can be reduced while maintaining the distance between the signal conductor 6 and the screen foil 12. Overall, this leads to thinner wires 4 and correspondingly to the reduced spacing a between the two signal conductors 6
  • This reduced distance a the two wires 4 are more strongly coupled together, since the shielding film 12 formed by the pair shield - compared to the distance a of the signal conductor 6 with each other - is now further away from the respective signal conductor 6.
  • Unwanted asymmetries, which can not be completely avoided during production, have less impact on the whole.
  • the so-called mode conversion performance improves significantly. Due to the small distance a, the insertion loss also improves in comparison to conventional conventional shielded wire pairs. Research has shown an improvement of 15%.
  • the electric field of the differential useful signal is predominantly in the (highly-cabled) material of the wire insulation 8, ie between the signal conductors 6 and propagates.
  • the field of unwanted common-mode signal must propagate through the intermediate shell 10 of solid solid material. Overall, this slows down the propagation speed of the unwanted common-mode signal in comparison to that of the differential useful signal.
  • the useful signal is therefore at the end of a transmission path, not or at least not so much superimposed by the common-mode signal, so that a better evaluation of the differential useful signal is possible.
  • a differential data signal with high data rates of, for example,> 25 Gbit / second and at transmission frequencies of> 25 GHz can be transmitted reliably and securely via the pair of wires 2.
  • FIG. 2 also shows a possible structure of a data cable 14, in which a plurality of such screened pairs of wires 2 are combined with one another.
  • the data cable 14 can also have only one shielded pair of wires 2.
  • the data cable 14 preferably has two, four, sixteen or, as shown in FIG. 2, eight shielded wire pairs 2.
  • the individual wire pairs 2 are usually stranded together and form a transmission core.
  • two inner core pairs 2 are stranded together and form an inner transfer core.
  • six more shielded pairs of wires 2 are arranged in particular stranded around. These therefore form, so to speak, an outer (rope) position.
  • the transmission core formed by the shielded core pairs 2 is surrounded by an overall shield 16.
  • an intermediate film 18 made of plastic is disposed between the transfer core and the overall screen 16.
  • the overall screen 16 may have a conventional structure.
  • the overall screen 16 is formed by an inner screen foil 20 and an outer screen braid 22. Re combinations of screen films 20 with C, D shields or even several screen films, etc. are basically possible.
  • an outer cable sheath 24 around the overall shield 16 is attached to protect it from environmental influences. This cable sheath 24 is also extruded in particular.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulated Conductors (AREA)
  • Communication Cables (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Manufacturing Of Electric Cables (AREA)

Abstract

Câble de données pour transferts de données haute vitesse, comprenant une paire de conducteurs entourée d'un blindage, caractérisé en ce qu'une gaine intermédiaire isolante (10) est disposée entre la paire de conducteurs (2) et le blindage de paire (12).
EP16793779.6A 2015-11-17 2016-10-24 Câble de données pour transferts de données haute vitesse Withdrawn EP3350813A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015222699 2015-11-17
PCT/EP2016/075484 WO2017084835A1 (fr) 2015-11-17 2016-10-24 Câble de données pour transferts de données haute vitesse

Publications (1)

Publication Number Publication Date
EP3350813A1 true EP3350813A1 (fr) 2018-07-25

Family

ID=57256266

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16793779.6A Withdrawn EP3350813A1 (fr) 2015-11-17 2016-10-24 Câble de données pour transferts de données haute vitesse

Country Status (7)

Country Link
US (1) US20180268965A1 (fr)
EP (1) EP3350813A1 (fr)
JP (1) JP2018536259A (fr)
KR (1) KR20180088668A (fr)
CN (1) CN108352226A (fr)
TW (1) TWI636465B (fr)
WO (1) WO2017084835A1 (fr)

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WO2020124387A1 (fr) * 2018-12-18 2020-06-25 江苏亨通线缆科技有限公司 Câble de communication numérique de catégorie -7
CN112768146A (zh) 2019-11-02 2021-05-07 富士康(昆山)电脑接插件有限公司 双轴线缆
CN215298943U (zh) * 2021-01-04 2021-12-24 富士康(昆山)电脑接插件有限公司 线缆
CN215911211U (zh) 2021-04-15 2022-02-25 富士康(昆山)电脑接插件有限公司 线缆
CN216562522U (zh) * 2021-10-24 2022-05-17 富港电子（东莞）有限公司 高频传输线
CN217061507U (zh) * 2022-03-02 2022-07-26 富士康(昆山)电脑接插件有限公司 线缆

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Also Published As

Publication number Publication date
US20180268965A1 (en) 2018-09-20
TW201721666A (zh) 2017-06-16
WO2017084835A1 (fr) 2017-05-26
KR20180088668A (ko) 2018-08-06
CN108352226A (zh) 2018-07-31
TWI636465B (zh) 2018-09-21
JP2018536259A (ja) 2018-12-06

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