EP1150305A2 - Elektrisches Kabel mit reduzierter Dämpfung und zugehöriges Herstellungsverfahren - Google Patents

Elektrisches Kabel mit reduzierter Dämpfung und zugehöriges Herstellungsverfahren Download PDF

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Publication number
EP1150305A2
EP1150305A2 EP01303769A EP01303769A EP1150305A2 EP 1150305 A2 EP1150305 A2 EP 1150305A2 EP 01303769 A EP01303769 A EP 01303769A EP 01303769 A EP01303769 A EP 01303769A EP 1150305 A2 EP1150305 A2 EP 1150305A2
Authority
EP
European Patent Office
Prior art keywords
separator layer
conductive element
around
recited
forming
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Withdrawn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
EP01303769A
Other languages
English (en)
French (fr)
Other versions
EP1150305A3 (de
Inventor
Bruce J. Clark
John T. Milsaps
Paul Emilien Neveux Jr.
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.)
Avaya Technology LLC
Original Assignee
Avaya Technology LLC
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 Avaya Technology LLC filed Critical Avaya Technology LLC
Publication of EP1150305A2 publication Critical patent/EP1150305A2/de
Publication of EP1150305A3 publication Critical patent/EP1150305A3/de
Withdrawn legal-status Critical Current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
    • H01B11/02—Cables with twisted pairs or quads
    • H01B11/04—Cables with twisted pairs or quads with pairs or quads mutually positioned to reduce cross-talk

Definitions

  • the invention relates to electrical cabling. More particularly, the invention relates to electrical cabling having reduced attenuation.
  • Electrical cables typically are used to transmit large amounts of information great distances, e.g., between and within various communication networks including local area networks (LANs).
  • Electrical communication cables typically are comprised of a plurality of twisted pair of individually insulated, electrically conductive elements such as insulated copper wires surrounded by a protective, dielectric jacket made of, e.g., ethylenechlorotrifluoroethylene (ECTFE), low smoke polyvinyl chloride (LSPVC), or fluoroethylenepropylene (FEP).
  • ECTFE ethylenechlorotrifluoroethylene
  • LSPVC low smoke polyvinyl chloride
  • FEP fluoroethylenepropylene
  • electrical communication cables used for indoor applications typically have flame retardancy and low smoke requirements.
  • Electrical communication cables having copper insulation materials formed from fluoropolymers such as FEP must pass standardized fire tests, e.g., the Underwriter's Laboratory Standard 910 test (the Steiner Tunnel test) or NFPA 262, which qualifies these cables for use in plenum space inside buildings.
  • jackets made of materials such as LSPVC which has more favorable fire test burn characteristics than, e.g., conventional PVC jackets.
  • jackets made of materials such as LSPVC have poorer dielectric properties, thus contributing to increased attenuation of signals propagated along the conductor elements.
  • jackets used in conventional cabling configurations often are formed relatively tightly around the transmission media therein to improve the protection thereof.
  • such configurations often make it difficult for a portion of the jacket to be stripped away, e.g., during installation, repair, splicing and other operations.
  • relatively tight arrangements further contribute to increased attenuation.
  • the invention is embodied in a communication cable apparatus and method for making a communication cable apparatus.
  • the communication cable apparatus comprises an information transmission medium such as an insulated electrical conductor or a pair of electrical conductors, which may or may not be separated by a dielectric spacer tape or cross-piece or flute; a separator layer formed around the transmission medium; and a protective, low smoke polyvinyl chloride (LSPVC) jacket formed around the separator layer.
  • the separator layer is made of, e.g., polytetrafluoroethylene (PTFE) or other suitable dielectric material.
  • a method for making communication cables comprises providing a transmission medium such as an insulated electrical conductor, a pair of insulated electrical conductors or a plurality of insulated electrical conductor pairs, forming a separator layer around the transmission medium, and forming a protective LSPVC jacket around the separator layer.
  • the separator layer is made of a suitable dielectric material such as PTFE tape.
  • the separator layer improves the dielectric properties of the cable in such a way that attenuation of signals propagated along the electrical conductors is reduced. Also, the separator layer reduces tightness between the protective jacket and the transmission medium, further reducing attenuation in the cable and allowing portions of the protective jacket to be stripped away more readily than in conventional communication cable configurations.
  • the electrical communications cable 10 includes an electrically conductive transmission medium such as a plurality of conductor elements 12 such as twisted pairs of copper wire 13 individually insulated with a layer 14 of, e.g., fluoroethylenepropylene (FEP) or other suitable material such as polytetrafluoroethylene (PTFE), ethylenetetrafluoroethylene (ETFE) and perfluoroalkoxy polymers (PFA).
  • FEP fluoroethylenepropylene
  • PTFE polytetrafluoroethylene
  • ETFE ethylenetetrafluoroethylene
  • PFA perfluoroalkoxy polymers
  • the electrical communications cable 10 further comprises a separator layer 16 formed around the conductor pairs 12 and a protective jacket 18 formed around the separator layer 16.
  • the separator layer is wrapped around the conductor pairs, e.g., either longitudinally (shown generally in Fig. 1) or helically (shown generally in Fig. 2).
  • the protective jacket 18 typically is made of a suitable dielectric material, such as low smoke polyvinyl chloride (LSPVC), ethylenechlorotrifluoroethylene (ECTFE) or fluoroethylenepropylene (FEP), and typically has a thickness of approximately 10 to approximately 25 mils.
  • LSPVC low smoke polyvinyl chloride
  • ECTFE ethylenechlorotrifluoroethylene
  • FEP fluoroethylenepropylene
  • the protective jacket is made of LSPVC
  • the relatively high dielectric constant of the LSPVC degrades the overall dielectric properties of the cable, sometimes to the extent that the cable fails industry standard attenuation tests (e.g., Category 6B test).
  • the relative tightness of existing electrical cable arrangements, including those having LSPVC protective jackets tends to cause unacceptable degrees of attenuation.
  • LSPVC often is the material of choice for electrical cable protective jackets because LSPVC performs better in burn tests than many other materials.
  • Embodiments of the invention are based on the realization that attenuation of signals propagated within electrical cables having protective jackets made of LSPVC is reduced by having a separator layer (e.g., the separator layer 16) with a low dielectric constant and a low dissipation factor. Also, according to embodiments of the invention, the separator layer does not contribute smoke or heat to the cable 10 during a burn test, is relatively easy to apply to the conductor pairs 12, and is relatively flexible so as not to add to the overall stiffness of the cable 10. Also, the separator layer 16 does not stick to the conductor pairs 12, thus allowing the protective jacket 18 to be removed relatively easily.
  • a separator layer e.g., the separator layer 16
  • the separator layer 16 does not contribute smoke or heat to the cable 10 during a burn test, is relatively easy to apply to the conductor pairs 12, and is relatively flexible so as not to add to the overall stiffness of the cable 10. Also, the separator layer 16 does not stick to the conductor pairs 12, thus allowing the protective jacket 18
  • the separator layer 16 is made of, e.g., polytetrafluoroethylene (PTFE) or other suitable dielectric material. Having the separator layer 16 made of, e.g., PTFE, satisfies the requirements set forth above for reducing attenuation within electrical communication cables without sacrificing burn test performance characteristics.
  • PTFE tape when wrapped around the conductor pairs 12, e.g., longitudinally or helically, improves the transmission characteristics of the cable 10 by reducing attenuation therein of signals propagating along conductors therein.
  • the PTFE tape has a thickness, e.g., within the range from approximately 1 mil to approximately 10 mils.
  • a PTFE separator layer does not flow like some other materials (e.g., FEP) during burn tests and thus does not contribute to the breach of the protective jacket 18, which is believed to add additional smoke during burn tests.
  • a PTFE tape separator layer does not stick to the conductor pairs 12, thus allowing the protective jacket 18 to be removed more easily, e.g., during installation, repair, splicing and other operations.
  • PTFE tape is beneficial as a separator layer because PTFE forms around the transmission media relatively easily using conventional techniques.
  • the PTFE tape separator layer 16 is wound around the conductor pairs 12 longitudinally. Such configuration also is known as cigarette wrapping.
  • the communication cable 10 includes the PTFE tape separator layer 16 wound around the conductor pairs 12 in a helical manner.
  • the communication cable includes a flute for maintaining separation between the conductor pairs.
  • Fig. 3 illustrates an alternative embodiment of the invention in which a fluted electrical cable 30 includes a flute 19, and the separator layer 16 wrapped longitudinally around the conductor pairs 12 and between the conductor pairs 12 and the LSPVC jacket 18.
  • Fig. 4 illustrates another embodiment of the invention in which the fluted electrical cable 30 includes the flute 19, and the separator layer 16 wrapped helically around the conductor pairs 12 and between the conductor pairs 12 and the LSPVC jacket 18.
  • the flute is, e.g., a conventional flute made of a low dielectric plastic or other suitable material having relatively low flammability.
  • the method 50 includes a first step 52 of providing an information transmission medium such as a plurality of electrical conductor pairs or a plurality of optical fibers, as discussed hereinabove.
  • the next step 54 is to form the separator layer around the transmission medium, e.g., using conventional techniques.
  • the separator layer is made of PTFE or other suitable dielectric material, and has a thickness within the range from approximately 1 mil to approximately 10 mils.
  • the separator layer is wrapped or wound around the transmission medium longitudinally (e.g., as shown in Figs. 1 and 3) or helically (e.g., as shown in Figs. 2 and 4).
  • the next step 56 is to form the LSPVC protective jacket around the separator layer.
  • the protective jacket formation step 56 is performed by any suitable technique, including, e.g., conventional extrusion techniques.
  • embodiments of the invention use a separator layer made of a suitable dielectric material, e.g., PTFE or PTFE tape, between the electrical conductors and the LSPVC protective jacket.
  • the separator layer reduces attenuation by improving the overall dielectric properties of the electrical communication cable.
  • LSPVC has a relatively high dielectric constant
  • cables with jackets made of LSPVC jackets tend to have a relatively high overall dielectric constant, which increases attenuation.
  • a separator layer made of PTFE or PTFE tape with its relatively low dielectric constant, improves the overall dielectric properties of the cable.
  • the dielectric separator layer provides a suitable degree of separation between the conductor elements and the LSPVC jacket, which separation also contributes to reduced attenuation.
  • PTFE separator layers do not contribute smoke or heat to the cable 10 during a burn test.
  • separator layers made of PTFE and other suitable materials according to embodiments of the invention tend to be relatively flexible and thus do not add to the overall stiffness of the cable 10.
  • PTFE and other separator layers do not stick to the conductor pairs 12, thus allowing relatively easy removal of the protective jacket 18, e.g., when repairing the cable 10.

Landscapes

  • Insulated Conductors (AREA)
  • Communication Cables (AREA)
EP01303769A 2000-04-26 2001-04-25 Elektrisches Kabel mit reduzierter Dämpfung und zugehöriges Herstellungsverfahren Withdrawn EP1150305A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US55876200A 2000-04-26 2000-04-26
US558762 2000-04-26

Publications (2)

Publication Number Publication Date
EP1150305A2 true EP1150305A2 (de) 2001-10-31
EP1150305A3 EP1150305A3 (de) 2003-01-08

Family

ID=24230886

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01303769A Withdrawn EP1150305A3 (de) 2000-04-26 2001-04-25 Elektrisches Kabel mit reduzierter Dämpfung und zugehöriges Herstellungsverfahren

Country Status (3)

Country Link
EP (1) EP1150305A3 (de)
JP (1) JP2001357731A (de)
BR (1) BR0101479A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103871661A (zh) * 2014-02-24 2014-06-18 安徽华联电缆集团有限公司 一种安全型核电站专用电力电缆
US20150318075A1 (en) * 2014-05-01 2015-11-05 Nexans Profiled cross filler in lan cables
CN106782889A (zh) * 2016-12-28 2017-05-31 江苏戴普科技有限公司 轨道交通用双接头网线的制备工艺
US11926753B2 (en) 2018-03-26 2024-03-12 Daikin Industries, Ltd. Fluororesin material, fluororesin material for high frequency transmission, and covered electric wire for high-frequency transmission

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7214880B2 (en) * 2002-09-24 2007-05-08 Adc Incorporated Communication wire
JP5191732B2 (ja) * 2004-08-23 2013-05-08 ユニオン カーバイド ケミカルズ アンド プラスティックス テクノロジー エルエルシー 通信ケーブル−難燃性セパレータ
CN104751958A (zh) * 2015-03-27 2015-07-01 安徽华电线缆集团有限公司 一种阻水防鼠防蚁计算机电缆

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4755629A (en) * 1985-09-27 1988-07-05 At&T Technologies Local area network cable
EP0526109A2 (de) * 1991-07-31 1993-02-03 AT&T Corp. Flammwidriges Kabel zur Übertragung von Hochfrequenz-Signalen
US5574250A (en) * 1995-02-03 1996-11-12 W. L. Gore & Associates, Inc. Multiple differential pair cable
US5834697A (en) * 1996-08-01 1998-11-10 Cable Design Technologies, Inc. Signal phase delay controlled data cables having dissimilar insulation materials

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4755629A (en) * 1985-09-27 1988-07-05 At&T Technologies Local area network cable
EP0526109A2 (de) * 1991-07-31 1993-02-03 AT&T Corp. Flammwidriges Kabel zur Übertragung von Hochfrequenz-Signalen
US5574250A (en) * 1995-02-03 1996-11-12 W. L. Gore & Associates, Inc. Multiple differential pair cable
US5834697A (en) * 1996-08-01 1998-11-10 Cable Design Technologies, Inc. Signal phase delay controlled data cables having dissimilar insulation materials

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103871661A (zh) * 2014-02-24 2014-06-18 安徽华联电缆集团有限公司 一种安全型核电站专用电力电缆
CN103871661B (zh) * 2014-02-24 2016-04-06 安徽华联电缆集团有限公司 一种安全型核电站专用电力电缆
US20150318075A1 (en) * 2014-05-01 2015-11-05 Nexans Profiled cross filler in lan cables
EP3138107A1 (de) * 2014-05-01 2017-03-08 Nexans Profilierter querfüller in lan-kabeln
CN106782889A (zh) * 2016-12-28 2017-05-31 江苏戴普科技有限公司 轨道交通用双接头网线的制备工艺
US11926753B2 (en) 2018-03-26 2024-03-12 Daikin Industries, Ltd. Fluororesin material, fluororesin material for high frequency transmission, and covered electric wire for high-frequency transmission

Also Published As

Publication number Publication date
BR0101479A (pt) 2001-11-20
EP1150305A3 (de) 2003-01-08
JP2001357731A (ja) 2001-12-26

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