WO2021137613A1 - Câble de communication - Google Patents

Câble de communication Download PDF

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Publication number
WO2021137613A1
WO2021137613A1 PCT/KR2020/019379 KR2020019379W WO2021137613A1 WO 2021137613 A1 WO2021137613 A1 WO 2021137613A1 KR 2020019379 W KR2020019379 W KR 2020019379W WO 2021137613 A1 WO2021137613 A1 WO 2021137613A1
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WO
WIPO (PCT)
Prior art keywords
communication cable
separator
stranded
cable
present
Prior art date
Application number
PCT/KR2020/019379
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English (en)
Korean (ko)
Inventor
육태경
박운규
Original Assignee
엘에스전선 주식회사
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.)
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Priority claimed from KR1020200186327A external-priority patent/KR20210087882A/ko
Application filed by 엘에스전선 주식회사 filed Critical 엘에스전선 주식회사
Publication of WO2021137613A1 publication Critical patent/WO2021137613A1/fr

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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
    • H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
    • H01B11/08—Screens specially adapted for reducing cross-talk

Definitions

  • the present invention relates to a communication cable. More specifically, the present invention relates to an Ethernet cable capable of improving crosstalk characteristics between twisted-pair parts inside a cable and minimizing interference between external cables during high-speed data transmission.
  • an Ethernet cable used as a communication cable that enables high-speed data transmission is a spiral wire in which a conductor 10 made of copper or the like is covered with an insulator 20 . Twisted to make a plurality (about 4) of the stranded wire portion 30, and has a structure in which the plurality of stranded wire portions are embedded in the sheath portion 50, which is the outer skin.
  • crosstalk a phenomenon affecting due to electromagnetic coupling between twisted pairs inside cables, may occur, and when multiple cables in a building are installed in a bundle form, the cables themselves There is a problem in that the overall communication quality may be deteriorated due to the Alien Crosstalk phenomenon due to the electromagnetic interference (EMI) phenomenon in the twisted-pair part.
  • EMI electromagnetic interference
  • a conventional Ethernet cable introduces a separator 40 made of high-density polyethylene to separate the distances between twisted pairs by a predetermined distance or more (see FIG. 1 ).
  • the separator is made of a high-density polyethylene material
  • the high-density polyethylene separator is a non-metal material and has no shielding function. Since the shielding function must be induced with a separation distance greater than the level, there is a limit to the design of the compact structure of the separator, which causes an additional problem in that the outer diameter of the entire cable is increased.
  • the UTP cable Unshielded Twisted Pair
  • the interference Alien Crosstalk
  • EMI electromagnetic interference
  • Patent Document 1 Korea Patent Publication No. 10-1540980 (published on Jul. 26, 2011)
  • An object of the present invention is to provide a communication cable. More specifically, the present invention can improve crosstalk characteristics between twisted pairs inside cables and minimize the influence of interference between external cables at the time of high-speed data transmission. To provide an Ethernet cable that satisfies both hardening and light weight characteristics.
  • the present invention provides a plurality of stranded wire portions formed by twisting at least two conductive wires covered with an insulator in a helical manner; a separator for separating the plurality of stranded wires from each other; and a sheath portion surrounding the plurality of stranded wire portions and the separator, wherein the separator includes a carbon particle-containing material, and has the same number of ribs as the number of the plurality of softer portions, and the length of each rib is equal to that of the conductive wire. larger than the diameter, and the ratio of the average thickness of each rib to the average diameter of the conductor is 0.26 to 0.69.
  • the present invention provides a communication cable, characterized in that the spacing between adjacent twisted-pair portions spaced apart by the separator is 0.15 mm to 0.35 mm.
  • the present invention provides a communication cable, wherein the length of the separator is smaller than the inner diameter of the sheath.
  • the present invention provides a communication cable characterized in that the shape of the separator is " ⁇ " shape.
  • the present invention provides a communication cable, characterized in that the shape of the separator has a curved shape so that any one adjacent in the vertical or left and right directions in the " ⁇ " shape surrounds the stranded wire portion.
  • the present invention provides a communication cable, characterized in that the carbon particle-containing material is carbon fiber or carbon powder.
  • the present invention provides a communication cable, characterized in that the separator further includes a highly conductive material.
  • the present invention provides a communication cable, characterized in that the highly conductive material has an electrical conductivity of 5 times or more compared to the carbon particle-containing material.
  • the present invention provides a communication cable, characterized in that the highly conductive material is copper (Cu).
  • the present invention provides a communication cable, characterized in that the content of the highly conductive material contained in the separator is 5% to 45% of the carbon particle-containing material.
  • the present invention is characterized in that the separator further includes a polymer resin, and the content of the polymer resin is 9:1 to 3:7 relative to the total content of the carbon particle-containing material and the high conductive material, A communication cable is provided.
  • the polymer resin polyethylene (Polyethylene, PE), polypropylene (Polypropylene, PP) and polyvinyl chloride (Polyvinyl Chloride, PVC) characterized in that at least one selected from the group consisting of, communication cable provides
  • the present invention provides a communication cable, characterized in that the separator is manufactured by mixing carbon fibers and a polymer resin, and is manufactured by performing a structural molding extrusion method on the carbon fibers through branching synthesis.
  • the present invention provides a communication cable, characterized in that the separator is manufactured by performing a weaving forming method.
  • the present invention provides that the plurality of stranded wire portions include first to fourth stranded wire portions, and the first to fourth stranded wire portions are separated from each other by the separator, respectively, satisfying Equation 1 below. It provides a communication cable, characterized in that.
  • Equation 1 X is from the center of the nth stranded portion to the center of the n+2 stranded portion when the first to fourth stranded portions are circular and sequentially separated from each other in a clockwise or counterclockwise direction by the separator. is the distance of, R n is the radius of the nth stranded portion, R n+1 is the radius of the n+1st stranded portion, R n+2 is the radius of the n+2th stranded portion, P is the thickness of the separator, n is 1 or 2.
  • the present invention provides a communication cable, characterized in that the communication cable further includes a shielding layer directly surrounding the plurality of twisted pairs.
  • the present invention provides a communication cable, characterized in that the shielding layer includes a carbon particle-containing material and a highly conductive material.
  • the present invention provides a communication cable, characterized in that the shielding layer is manufactured by performing a weaving forming method or a braiding forming method.
  • the present invention provides a communication cable, characterized in that the communication cable satisfies the following Equation (2).
  • Equation 2 D c is the diameter of the communication cable, R n is the radius of the nth twisted pair part, R n+2 is the radius of the n+2 twisted pair part, S is the thickness of the sheath part, and n is 1 or 2 is
  • the present invention provides a communication cable, characterized in that the communication cable satisfies the ANSI/TIA-568-C.2 6.4.8 NEXT loss standard.
  • the communication cable according to the present invention can reduce the cable thickness while satisfying crosstalk characteristics between twisted pairs inside the cable and minimizing the influence of interference between external cables during high-speed data transmission.
  • the communication cable according to the present invention includes a separator including carbon fiber, it is possible to improve flexibility while retaining crosstalk characteristics and interference characteristics between external cables equal to or higher than those of existing 1Gbps-class communication cables.
  • the communication cable according to the present invention improves thinness and weight reduction at the same time, so that the application characteristics of the communication cable, that is, when applied as a bundle in which several cables are bundled through a data center, handling on installation work, By reducing the burden on the connector to which the cable is connected, it is possible to solve the problem of management burden such as grounding failure.
  • the communication cable according to the present invention has improved flexibility, thinness, and light weight, so that when a plurality of cables are installed in a building, a reduction in the installation area and easiness of installation work can be secured, and additionally It can help to reduce the weight when installing in aircraft, ships and vehicles.
  • 1 is a diagram schematically showing the structure of a conventional Ethernet cable.
  • FIG. 2 is a diagram schematically showing the structure of a communication cable according to the present invention.
  • FIG. 3 is a diagram schematically showing the structure of another exemplary communication cable according to the present invention.
  • first, second, etc. may be used to describe various elements, but the elements are not limited by the terms.
  • the above terms are used only for the purpose of distinguishing one component from another.
  • the second component may be referred to as the first component, and similarly, the first component may also be referred to as the second component.
  • the term "communication cable” may be used to refer to all cables for data transmission that are generally used, and according to the frequency standard, Cat (Category).3, Cat.4, Cat.5, It may be classified into Cat.6 and Cat.6A, etc., and may be classified and included into UTP (Unshielded Twisted Pair), FTP (Foiled Twisted Pair), and STP (Shielded Twisted Pair) according to the shielding standard.
  • the term "communication cable” may be used for cable applications of various structures including patch cords, backbone cables, and horizontal cables, but the present invention is not limited to these applications. In general, the present invention may be used in military, industrial, telecommunications, computer, data communications, and other cable applications.
  • the present invention provides a plurality of stranded wire portions formed by twisting at least two conductive wires covered with an insulator in a helical manner; a separator for separating the plurality of stranded wires from each other; and a sheath portion surrounding the plurality of twisted pair portions and the separator.
  • the plurality of stranded wire portions may be formed by twisting at least two conductive wires each independently coated with an insulator on the outer surface, and the conductive wires may be in the form of a solid or a twisted strand of a plurality of conductive wires. have.
  • four stranded wire parts are included in the sheath part according to the present invention to be described later, it is not limited thereto and various modifications are possible.
  • the pitch of each twisted wire part may be adjusted to be different from each other. This is because, when the pitch of each twisted pair is the same or similar, internal interference or crosstalk may easily occur between the twisted pairs.
  • the pitch of each twisted pair according to the present invention may be formed to be different from each other, and may have a difference of 0.1 mm or more from each other.
  • the separator serves to prevent electrical interference between the twisted-pair parts by separating the twisted-pair parts from each other. More specifically, the separator suppresses the occurrence of electromagnetic induction between the twisted-pair parts, thereby preventing crosstalk between the twisted-pair parts. If necessary, in order to prevent crosstalk due to internal interference between the twisted pair parts, a cross filler (eg, a polymer resin or a metal thin film, etc.) may be included as a separate configuration, but is not particularly limited thereto.
  • a cross filler eg, a polymer resin or a metal thin film, etc.
  • the separator may have the same number of ribs as the number of the plurality of twisted wire portions.
  • rib may be used to refer to a protrusion that separates each twisted pair in the separator.
  • Each length of each rib of the separator may be greater than a diameter of the conducting wire.
  • each stranded wire portion cannot maintain the separation structure by the separator, so there is a problem in that the NEXT characteristic is deteriorated.
  • a ratio of the average thickness of each of the ribs to the average diameter of the conductor may be 0.26 to 0.69. If the ratio of the average thickness of each rib to the average diameter of the conductor is out of the limited range, that is, less than 0.26, there may be a problem in that the NEXT characteristic deteriorates, and if it exceeds 0.69, the volume and weight increase. Therefore, there is a problem in that it does not satisfy the characteristics of thinning and weight reduction.
  • the separator can be produced including a carbon particle-containing material.
  • the communication cable according to the present invention includes a carbon particle-containing material having metallic shielding properties rather than a conventional separator made of polyethylene or the like, so that the thickness of the separator is determined by molding processing of the carbon particle-containing material. It is possible to apply the minimum possible thickness, and through this, the outer diameter of the entire cable can be reduced, and there is a very big advantage in that the weight increase can be minimized because the specific gravity is very low compared to the metal material.
  • the type of the carbon particle-containing material is not particularly limited, but, for example, carbon fiber or carbon powder may be used.
  • a highly conductive material may be included in addition to the above-described carbon particle-containing material.
  • electrical conductivity may be increased, and electromagnetic wave shielding performance may be further improved.
  • the electrical conductivity may be 5 times or more or 10 times or more compared to the carbon particle-containing material, and the higher the electrical conductivity, the higher the electrical conductivity is, so high-speed data transmission of the cable is possible, so the upper limit is particularly limited However, for example, it may be 30 times or less, 20 times or less, or 15 times or less.
  • the highly conductive material may be aluminum (Al) or copper (Cu), but more preferably copper (Cu).
  • the content of the high conductive material in the separator may be 6% to 44% compared to the carbon particle-containing material.
  • the range of the content of the high conductive material can maximize the improvement of the electromagnetic wave shielding performance and at the same time take into account the thickness of the cable that needs to be thinned.
  • the content of the high conductive material is less than 6% of the carbon particle-containing material, the electromagnetic wave
  • the effect of reducing the outer diameter (thinning) is insignificant due to the low shielding property effect, and when the content of the high conductive material is more than 44% of the carbon particle-containing material, the weight increases and production cost increases due to the cable application. There is this.
  • the thickness of the separator may also be an important factor in reducing the thickness of the cable.
  • a separation distance between adjacent stranded wires spaced apart by the separator in relation to the thickness of the separator may be 0.15 mm to 0.35 mm.
  • the separation distance between adjacent twisted-pair parts spaced apart by the separator maximizes the improvement of electromagnetic wave shielding performance, and at the same time takes into account the thickness of the cable that needs to be narrowed.
  • the spacing between adjacent twisted-pair parts spaced apart by the separator is less than 0.15 mm
  • electromagnetic wave shielding characteristics are unsatisfactory
  • the separation distance between adjacent stranded wires spaced apart by the separator is more than 0.35 mm, the outer diameter of the cable increases, so that the thinning characteristics cannot be satisfied.
  • the electromagnetic wave shielding characteristic that occurs when the separation distance between adjacent stranded parts spaced apart by the separator is less than 0.15 mm is "ANSI/TIA-568-C.2 6.4.8 NEXT loss", a standard related to the electromagnetic wave shielding characteristic evaluation As followed, the specific evaluation method is the same as the general evaluation method of "ANSI/TIA-568-C.2 6.4.8 NEXT loss".
  • the plurality of stranded wire portions include first to fourth stranded wire portions, and the first to fourth stranded wire portions are separated from each other by the separator, and satisfy Equation 1 below. It is possible to provide a communication cable, characterized in that.
  • Equation 1 X is from the center of the nth stranded portion to the center of the n+2 stranded portion when the first to fourth stranded portions are circular and sequentially separated from each other in a clockwise or counterclockwise direction by the separator. is the distance of, R n is the radius of the nth stranded portion, R n+1 is the radius of the n+1st stranded portion, R n+2 is the radius of the n+2th stranded portion, P is the thickness of the separator, n is 1 or 2.
  • Equation 1 may not be applied when the separator is not precisely divided into quarters due to bending or bending of the separator.
  • the structure For example, other equations may be applied in relation to the distance between each twisted pair) or data signal transmission capacity (Shannon capacity), and the communication cable according to the present invention is not particularly limited to satisfying Equation 1 above.
  • the separator may include a polymer resin in addition to the above-mentioned components, for example, polyethylene (PE), polypropylene (Polypropylene) , PP), polyvinyl chloride (Polyvinyl Chloride, PVC), etc., or may be made of a mixture of these materials.
  • a polymer resin in addition to the above-mentioned components, for example, polyethylene (PE), polypropylene (Polypropylene) , PP), polyvinyl chloride (Polyvinyl Chloride, PVC), etc., or may be made of a mixture of these materials.
  • the content of the polymer resin is 9:1 to 3:7, preferably 8: relative to the total content of the components included in the separator, that is, the carbon particle-containing material and the conductive material. 2 to 4:6, more preferably 7:3 to 5:5.
  • the content of the polymer resin may be interpreted as meaning that it may be 10 g to 210 g.
  • the content of the polymer resin is less than 9:1 to 3:7 relative to the total content of the components included in the separator, that is, the carbon particle-containing material and the highly conductive material.
  • the electromagnetic wave shielding properties are unsatisfactory and the overall cable outer diameter is increased. There are problems you can do.
  • the separator when the separator includes a polymer resin in addition to the carbon particle-containing material and the highly conductive material, it may be manufactured in various manufacturing examples.
  • the separator When the separator includes a polymer resin in addition to the carbon particle-containing material and the conductive material, the separator may be manufactured by performing a structural molding extrusion method.
  • the carbon particle-containing material carbon fibers may be used, and the carbon fibers may be manufactured by performing a structural molding extrusion method through branch synthesis.
  • the separator when the separator includes a polymer resin in addition to the carbon particle-containing material and the conductive material, it may be manufactured by performing a weaving molding method.
  • carbon fibers may be used as the carbon particle-containing material, and after plating the carbon fibers with a conductive material, weaving and molding are performed, and then the polymer resin is added and mixed.
  • carbon fiber may be used, and after plating the carbon fiber with a conductive material, it is pulverized to produce it in a powder form by extrusion processing with the polymer resin.
  • the carbon particle-containing material may use carbon powder, and is manufactured by doping the carbon powder with a highly conductive material in the form of particles, and then performing extrusion processing with the polymer resin. can do.
  • the manufacturing process of the separator according to the present invention may be performed in the same manner as the separator manufacturing process included in a typical communication cable, that is, an Ethernet cable production process, except for the above.
  • the sheath part surrounds the stranded wire part and the separator, and serves to protect the stranded wire part and the separator from external impact. Furthermore, the sheath unit may serve to block alien crosstalk caused by electromagnetic waves generated from other adjacent communication cables or other electronic equipment.
  • the sheath part may be made of PE, PP, PVC, LSZH (Low Smoki Zero Halogen or Olefin)-based polymer material, but in the present invention, as described above, carbon
  • LSZH Low Smoki Zero Halogen or Olefin
  • the sheath portion may include conductive particles, and in this case, electromagnetic wave shielding or mechanical properties may be simultaneously satisfied by the conductive particles.
  • the present invention may provide a communication cable characterized in that the following Equation 2 is satisfied.
  • Equation 2 D c is the diameter of the communication cable, R n is the radius of the nth twisted pair portion, R n+2 is the radius of the n+2 twisted pair portion, S is the thickness of the sheath layer, and n is 1 or 2.
  • Equation 2 may not be applied when the separator is not precisely divided into quarters due to bending or bending of the separator.
  • the structure For example, other equations may be applied in relation to the distance between each twisted pair) or data signal transmission capacity (Shannon capacity), and the communication cable according to the present invention is not particularly limited to satisfying Equation 2 above.
  • the separator can be made of a carbon fiber material, the separator can be more easily manufactured in a “ ⁇ ” shape.
  • the separator may provide a communication cable characterized in that it has a “ ⁇ ” shape, but for example, the length or thickness of the upper and lower parts or the left and right parts may be different, and a separator of a different shape may be applied, especially It is not limited thereto.
  • FIG. 2 is a diagram schematically showing the structure of a communication cable according to the present invention, in one example.
  • the separator has a curved shape so that any one adjacent in the vertical or left and right directions in the " ⁇ " shape surrounds the twisted pair part. to provide.
  • the communication cable according to the present invention is manufactured by including a carbon fiber separator inside, and additionally has a structure as shown in FIG. 2 , so that in addition to preventing crosstalk between internal twisted pairs, extraneous interference that can be issued between external cables more efficiently phenomenon can be effectively prevented.
  • the communication cable according to the present invention may satisfy the ANSI/TIA-568-C.2 6.4.8 NEXT loss standard.
  • the "ANSI/TIA-568-C.2 6.4.8 NEXT loss standard” is a standard related to the evaluation of electromagnetic wave shielding characteristics, as described above, and the specific evaluation method is the above “ANSI/TIA-568-C.2 6.4" It is the same as the general evaluation method of ".8 NEXT loss", and the communication cable according to the present invention satisfies the ANSI/TIA-568-C.2 6.4.8 NEXT loss standard, so that it can be specifically commercialized and utilized.
  • the communication cable according to the present invention may additionally include a shielding layer.
  • FIG. 3 is a diagram schematically showing the structure of another exemplary communication cable according to the present invention.
  • the communication cable 100 according to the present invention may include a shielding layer 60 directly surrounding the stranded wire part 30 inside the sheath part 50 .
  • the communication cable according to the present invention additionally includes the shielding layer, the electromagnetic wave shielding phenomenon can be more efficiently performed.
  • the shielding layer it may include the same components as the separator 40 according to the present invention described above, that is, a carbon particle-containing material and a highly conductive material, and may additionally include a polymer resin. Since they are the same, they are omitted below.
  • the manufacturing method of the inner shielding layer is not particularly limited, but may be manufactured by, for example, performing a weaving processing molding method or a braiding processing molding method to enable the production of a circular shape.
  • the weight per unit length (g/m) of a cable having a separator containing carbon particles and a highly conductive material was compared based on the weight per unit length (36.65 g/m) of a cable to which a general separator made of non-conductive resin was applied. .
  • the reference product used a commercial UTP cable to which the separator material HDPE was applied, and the product to be evaluated was a UTP cable prototype in which the separator material was carbon fiber coated with copper.
  • a plurality of prototypes having different doping rates of the highly conductive material (Cu) and thicknesses of the separators were measured for each unit length.
  • the outer diameter of the UTP cable was measured for each separator thickness.
  • the "doping rate” means the content of the high-conductivity material compared to the carbon particle-containing material included in the separator.
  • the minimum difference (margin, dB) between the NEXT loss and the TIA standard in each frequency band was measured for a plurality of prototypes with different doping rates of the highly conductive material (Cu) and different thicknesses of the separators.
  • the "NEXT loss” is the ratio of the input-output signal wave length ( ) means
  • the margin compared to the TIA standard was calculated and shown in Table 4 below.
  • the margin compared to the TIA standard should be a (+) value.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Communication Cables (AREA)
  • Insulated Conductors (AREA)

Abstract

La présente invention concerne un câble de communication pouvant : satisfaire des caractéristiques de diaphonie entre des parties toronnées à l'intérieur du câble et, simultanément, minimiser l'influence d'interférence entre des câbles externes et permettre un amincissement de câble ; et améliorer la flexibilité. De plus, le câble de communication présente des caractéristiques d'amincissement et de légèreté améliorées, et peut ainsi résoudre le problème d'applicabilité d'un câble de communication. De plus, le câble de communication selon la présente invention présente une flexibilité améliorée, un amincissement et des caractéristiques légères, ce qui permet de garantir une réduction de la surface de pose, de simplifier le travail de pose et similaire, et de faciliter l'éclaircissement lors de la pose dans des aéronefs, des navires et des véhicules.
PCT/KR2020/019379 2020-01-03 2020-12-30 Câble de communication WO2021137613A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20200000795 2020-01-03
KR10-2020-0000795 2020-01-03
KR1020200186327A KR20210087882A (ko) 2020-01-03 2020-12-29 통신 케이블
KR10-2020-0186327 2020-12-29

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WO2021137613A1 true WO2021137613A1 (fr) 2021-07-08

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120027947A (ko) * 2010-09-14 2012-03-22 엘에스전선 주식회사 난연 차폐 테이프를 구비하는 통신용 케이블
US20130248240A1 (en) * 2012-03-13 2013-09-26 Cable Components Group, Llc Compositions, methods, and devices providing shielding in communications cables
KR20140027472A (ko) * 2011-07-08 2014-03-06 제너럴 케이블 테크놀로지즈 코오포레이션 케이블 부품에 대한 차폐물 및 방법
US20140262427A1 (en) * 2013-03-15 2014-09-18 General Cable Technologies Corporation Foamed polymer separator for cabling
KR20180067104A (ko) * 2016-12-12 2018-06-20 엘에스전선 주식회사 탄소섬유를 이용한 차폐 케이블

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120027947A (ko) * 2010-09-14 2012-03-22 엘에스전선 주식회사 난연 차폐 테이프를 구비하는 통신용 케이블
KR20140027472A (ko) * 2011-07-08 2014-03-06 제너럴 케이블 테크놀로지즈 코오포레이션 케이블 부품에 대한 차폐물 및 방법
US20130248240A1 (en) * 2012-03-13 2013-09-26 Cable Components Group, Llc Compositions, methods, and devices providing shielding in communications cables
US20140262427A1 (en) * 2013-03-15 2014-09-18 General Cable Technologies Corporation Foamed polymer separator for cabling
KR20180067104A (ko) * 2016-12-12 2018-06-20 엘에스전선 주식회사 탄소섬유를 이용한 차폐 케이블

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