WO2013081800A1 - Câble ruban large à canaux multiples - Google Patents

Câble ruban large à canaux multiples Download PDF

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Publication number
WO2013081800A1
WO2013081800A1 PCT/US2012/064445 US2012064445W WO2013081800A1 WO 2013081800 A1 WO2013081800 A1 WO 2013081800A1 US 2012064445 W US2012064445 W US 2012064445W WO 2013081800 A1 WO2013081800 A1 WO 2013081800A1
Authority
WO
WIPO (PCT)
Prior art keywords
cable
impedance
shielded electrical
conductor set
length
Prior art date
Application number
PCT/US2012/064445
Other languages
English (en)
Inventor
Douglas B. Gundel
Rocky D. Edwards
Mark M. Lettang
David L. Kordecki
Original Assignee
3M Innovative Properties Company
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 3M Innovative Properties Company filed Critical 3M Innovative Properties Company
Priority to CN201290001020.5U priority Critical patent/CN204270723U/zh
Publication of WO2013081800A1 publication Critical patent/WO2013081800A1/fr

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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
    • H01B11/18—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
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/08—Flat or ribbon cables
    • H01B7/0838—Parallel wires, sandwiched between two 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
    • H01B7/08—Flat or ribbon cables
    • H01B7/0861—Flat or ribbon cables comprising one or more screens

Definitions

  • the present disclosure relates generally to electrical cables.
  • Coaxial cables generally include an electrically conductive wire surrounded by an insulator. The wire and insulator are surrounded by a shield, and the wire, insulator, and shield are surrounded by a jacket.
  • a shielded electrical cable comprising one or more insulated signal conductors surrounded by a shielding layer formed, for example, by a metal foil. To facilitate electrical connection of the shielding layer, a further un- insulated conductor is sometimes provided between the shielding layer and the insulation of the signal conductor or conductors.
  • Both these common types of electrical cable normally require the use of specifically designed connectors for termination and are often not suitable for the use of mass-termination techniques, i.e., the simultaneous connection of a plurality of conductors to individual contact elements, such as, e.g., electrical contacts of an electrical connector or contact elements on a printed circuit board.
  • the disclosure generally relates to shielded electrical cables that form a shielded electrical ribbon cable.
  • at least six individual conductor sets of insulated conductors are shielded by shielding films that include cover portions and pinched portions separating the cover portions, over a cable width of at least 1.6 cm to form a shielded electrical ribbon cable.
  • the present disclosure provides a shielded electrical cable that includes at least six conductor sets extending along a length of the cable and being spaced apart from each other along a width of the cable, each conductor set including two or more insulated conductors; the first and second end conductors are separated by a width distance of at least 1.6 cm.
  • the shielded electrical cable further includes first and second shielding films disposed on opposite first and second sides of the cable, the first and second shielding films including cover portions and pinched portions arranged such that, in transverse cross section, the cover portions of the first and second shielding films in combination substantially surround each conductor set, and the pinched portions of the first and second shielding films in combination form pinched portions of the cable on each side of each conductor set.
  • the shielded electrical cable still further includes an adhesive layer bonding the first shielding film to the second shielding film in the pinched portions of the cable.
  • a maximum separation between the cover portions of the first and second shielding films is D; a first minimum separation between the pinched portions of the first and second shielding films is dl ; and dl/D is less than 0.25.
  • a second minimum separation between the cover portions of the first and second shielding films in regions within the conductor sets and between neighboring insulated conductors is d2; d2/D is greater than 0.33; and an impedance of each conductor set over a length of at least 1 meter, is within 10% of an average impedance of the conductor set over the same length.
  • FIG. 1 shows a schematic cross-sectional view of a shielded electrical cable
  • FIGS. 2A-2F show schematic cross-sectional views of exemplary shielded electrical cables
  • FIG. 3A shows a schematic cross-sectional view of a shielded electrical cable
  • FIG. 3B shows an overhead schematic view of the shielded electrical cable of FIG. 3 A.
  • FIG. 4 shows a plot of the impedance data from the shielded electrical cable of FIGS. 3A-3B.
  • Shielding is used in some electrical cables to reduce interactions between signals carried by neighboring conductors.
  • Many of the cables described herein have a generally flat configuration, and include conductor sets that extend along a length of the cable, as well as electrical shielding films disposed on opposite sides of the cable. Pinched portions of the shielding films between adjacent conductor sets help to electrically isolate the conductor sets from each other.
  • Many of the cables also include drain wires that electrically connect to the shields, and extend along the length of the cable. The cable configurations can help to simplify connections to the conductor sets and drain wires, reduce the size of the cable connection sites, and/or provide opportunities for mass termination of the cable.
  • a semi-rigid cable can be formed using a thicker metal or metallic material as the shielding film.
  • aluminum or other metal may be used in this approach without a polymer backing film.
  • the aluminum (or other material) is passed through shaping dies to create corrugations in the aluminum which form cover portions and pinched portions.
  • the insulated conductors are placed in the corrugations that form the cover portions. If drain wires are used, smaller corrugations may be formed for the drain wires.
  • the insulated conductors and, optionally, drain wires are sandwiched in between opposite layers of corrugated aluminum.
  • the aluminum layers may be bonded together with adhesive or welded, for example. Connection between the upper and lower corrugated aluminum shielding films could be through the un-insulated drain wires.
  • the cover regions of the shielded electrical cable include concentric regions and transition regions positioned on one or both sides of a given conductor set. Portions of a given shielding film in the concentric regions are referred to as concentric portions of the shielding film and portions of the shielding film in the transition regions are referred to as transition portions of the shielding film.
  • the transition regions can be configured to provide high manufacturability and strain and stress relief of the shielded electrical cable.
  • Maintaining the transition regions at a substantially constant configuration (including aspects such as, e.g., size, shape, content, and radius of curvature) along the length of the shielded electrical cable may help the shielded electrical cable to have substantially uniform electrical properties, such as, e.g., high frequency isolation, impedance, skew, insertion loss, reflection, mode conversion, eye opening, and jitter.
  • the conductor set includes two insulated conductors that extend along a length of the cable that are arranged generally in a single and effectively as a twinaxial cable that can be connected in a differential pair circuit arrangement
  • maintaining the transition portion at a substantially constant configuration along the length of the shielded electrical cable can beneficially provide substantially the same electromagnetic field deviation from an ideal concentric case for both conductors in the conductor set.
  • careful control of the configuration of this transition portion along the length of the shielded electrical cable can contribute to the advantageous electrical performance and characteristics of the cable.
  • the widest cable created using previous pinched ribbon cable constructions (defined by the distance between the outer edge of the two outer channels) was on the order of 15 mm, and contained eight or fewer channels (eight only for 32 AWG wire).
  • the need for larger wire gauges and/or larger connector pitches along with the larger number of channels has made it difficult to fit all channels for a connector or a cable in less than a 15 mm width.
  • Two or more cables in a side -by-side placement is a possible solution, but has drawbacks including the need to manage multiple cables, and the reduced density due to the presence of at least two extra cable edges. Further, there is increased manufacturing cost for multiple ribbons due to increased materials, increased waste, and possibly a more narrow process width.
  • a single wide cable solution is superior to multiple discrete channels or multiple ribbon cable.
  • a wide, multi-channel ribbon cable for high speed data transfer requires each channel to have well-controlled geometry, which results in a well-controlled impedance.
  • a pinched shield construction that uses at least one continuous shielding film on one side of the cable forms the channel by shaping the films on at least one side of each channel. Any dimensional changes or imbalances may produce imbalances in capacitance and inductance along the length of the parallel portion. This in turn may cause impedance differences along the length of the pinched region and impedance imbalances between adjacent conductor sets. At least for these reasons, control of the spacing between the shielding films may be desired.
  • the pinched portions of the shielding films in the pinched regions of the cable on both sides of a conductor set are spaced apart within about 0.05 mm of each other.
  • the impedance of one channel relative to the others (if meant to be the same impedance) and also the impedance consistency of a channel along the cable length can be an important parameter.
  • the level of this impedance control should be within 10% from channel to channel (if the channels are meant to be the same impedance) and within 10% over a reasonable distance of each channel (1 meter for example). If the channels are not meant to be the same impedance (for example 100 ohms vs 85 ohms nominal impedance) then another measure is for each channel to be within 10% or 5% of a nominal value, or its mean value over a given length.
  • any impedance changes along the length of a transmission line may cause power to be reflected back to the source instead of being transmitted to the target.
  • the transmission line will have no impedance variation along its length, but, depending on the intended application, variations up to 5-10% of a target impedance value, such as, e.g., 50 Ohms, over a given length, such as, e.g., 1 meter, may be acceptable.
  • the conductor sets and shielding film may be cooperatively configured in an impedance controlling relationship.
  • this impedance variation is less than 5 Ohms and preferably less than 3 Ohms along a representative cable length, such as, e.g., 1 m.
  • the insulated conductors are arranged effectively in a twinaxial and/or differential pair cable arrangement, this means that the partial coverage of the conductor sets by the shielding film is accomplished with a desired consistency in geometry between the insulated conductors of a pair such as to provide an acceptable impedance variation as suitable for the intended application.
  • the impedance variation is less than 2 Ohms and preferably less than 0.5 Ohms along a representative cable length, such as, e.g., 1 m.
  • Near-end crosstalk and/or far-end crosstalk can be important measures of signal integrity or shielding in any electrical cable, including the disclosed cables and cable assemblies.
  • Grouping signal lines e.g. twinax pairs or other conductor sets
  • closer together in a cable and in a termination area tends to increase undesirable crosstalk, but the cable designs and termination designs disclosed herein can be used to counteract this tendency.
  • the subject of crosstalk in the cable and crosstalk within the connector can be addressed separately, but several of these methods for crosstalk reduction can be used together for enhanced crosstalk reduction.
  • the shielding films such that their cover portions, in combination, substantially surround any given conductor set, e.g., at least 75%, or at least 80, 85, or 90%, of the perimeter of the conductor set. It is also often desirable to minimize (including eliminate) any gaps between the shielding films in the pinched zones of the cable, and/or to use a low impedance or direct electrical contact between the two shielding films such as by direct contact or touching, or electrical contact through one or more drain wires, or using a conductive adhesive between the shielding films.
  • high frequency shielding may also be enhanced in the cable and/or at the termination component by grouping all such "transmit” conductors physically next to each another, and grouping all such “receive” conductors next to each other but segregated from the transmit pairs, to the extent possible, in the same ribbon cable.
  • the transmit group of conductors may also be separated from the receive group of conductors by one or more drain wires or other isolation structures as described elsewhere herein.
  • two separate ribbon cables one for transmit conductors and one for receive conductors, may be used, but the two (or more) cables are preferably arranged in a side -by-side configuration rather than stacked, so that advantages of a single flexible plane of ribbon cable can be maintained.
  • FIG. 1 shows a schematic cross-sectional view of a shielded electrical cable 100 according to one aspect of the disclosure. Details concerning the construction of such shielded ribbon cables can be found, for example, in U.S. Patent Application Serial No. 61/378877 entitled CONNECTOR
  • Shielded electrical cable 100 includes six conductor sets 1 10a - 1 lOf, optional sideband conductors 1 lOg, optional first and second ground/drain conductors 120a, 120b, a first shielding film 130, and a second shielding film 140 disposed on opposite sides of the shielded electrical cable 100. It is to be understood that shielded electrical cable 100 can include more than six conductor sets if desired, and also can include any number of optional sideband conductors, and any number of optional ground/drain conductors. The placement of each of the conductor sets, sideband conductors and ground/drain conductors is also not restricted; however, in some cases it may be desirable to provide as much symmetry to the cable as possible in order to minimize cross-talk between electrical signals.
  • Each of the six conductor sets 1 10a- 1 1 Of, the optional sideband conductors 1 1 Og, and optional first and second ground/drain conductors 120a, 120b, are substantially surrounded by a cover portion 150 that is formed by the combination of the first and the second shielding films 130, 140.
  • Each of the cover portions 150 are bounded on each side by a pinched portion 155 that is formed by pinching the first and second shielding films 130, 140, together.
  • An adhesive layer 1 16 bonds the first shielding film 130 to the second shielding film 140 in the pinched portions 155 of the shielded electrical cable 100.
  • the adhesive layer 1 16 can also extend to within the cover portions 150 that surround each of the six conductor sets 1 10a- 1 1 Of, the optional set of sideband conductors 1 1 Og, and optional first and second ground/drain conductors 120a.
  • each of the six conductor sets 110a- 1 1 Of include two insulated conductors comprising a first conductor 1 12 surrounded by a first insulator 1 13, and a second conductor 1 14 surrounded by a second insulator 1 15.
  • each of the six conductor sets 1 10a- 1 1 Of can include either more or fewer than two insulated conductors; however, two insulated conductors can be preferred.
  • one or more of the six conductor sets 1 10a- 1 1 Of can also include one or more ground/drain conductors (not shown) within the cover portions 150, as described elsewhere.
  • the shielded electrical cable 100 can have a width "W" measured from the outside edge of the end conductors (e.g., the first conductor set 1 10a and the sixth conductor set 1 1 Of) greater than about 1.6 cm, as shown in FIG. 1. In some cases, the width "W" can be greater than about 2 cm, or even greater than about 3 cm.
  • the first shielding film 130 and the second shielding film 140 in the cover portions 150 can include a maximum separation "D", and the first shielding film 130 and second shielding film 140 in the pinched portions 155 can include a minimum separation "dl". "D" and "dl” are related such that the ratio "dl/D" is less than about 0.25, or less than about 0.20, or less than about 0.15, or even less than about 0.10.
  • the packing density of conductor pairs in the shielded electrical cable can be related to the a minimum separation "d2" between the cover portions of the first and second shielding films in regions within the conductor sets 1 10a- 11 Of and between neighboring insulated conductors, where "d2" and “D” are related such that the ratio "d2/D" is greater than about 0.33, or greater than about 0.40, or greater than about 0.45, or even greater than about 0.50.
  • Electrical characteristics of a cable determine the cable's suitability for high speed signal transmission. Electrical characteristics of a cable include characteristic impedance, insertion loss, crosstalk, skew, eye opening, and jitter, among other characteristics. The electrical characteristics can depend on the physical geometry of the cable, as previously discussed, and can also depend on the material properties of the cable components. Thus is it generally desirable to maintain substantially uniform physical geometry and/or material properties along the cable length. For example, the characteristic impedance of an electrical cable depends on the physical geometry and material properties of the cable. If a cable is physically and materially uniform along its length, then the characteristic impedance of the cable will also be uniform. However, non-uniformities in the geometry and/or material properties of the cable can cause mismatches in the impedance at the points of non-uniformity.
  • the physical geometry and material properties of the described shielded electrical cable 100 may be controlled to produce minimal variations in the characteristic impedance over each conductor set 1 10a- 1 1 Of of the shielded electrical cable 100, when measured over a cable length of at least one meter.
  • minimal variations in the characteristic impedance over each conductor set 1 10a- 1 1 Of of the shielded electrical cable 100 can be when measured over a cable length of at least two meters.
  • the minimal variation in the characteristic impedance of each conductor set 1 10a- 1 1 Of can be within 10%, or within 8%, or within 5%, or even within 1% of an average impedance of the conductor set 1 10a- 1 1 Of over the same length.
  • FIGS. 2A-2F show schematic cross-sectional views of exemplary shielded electrical cables, according to one aspect of the disclosure. All of the elements "D”, “dl”, “d2”, “W”, and 1 12-155, as described in FIG. 1 apply equally to FIGS. 2A-2F as apparent to one of skill in the art; however, for brevity the descriptions are not duplicated.
  • shielded electrical cable 200 includes a first through eighth conductor sets 200a-200g that are distributed along a width "W" greater than about 1.6 cm.
  • a first and second ground/drain wire 220a, 220b are disposed at either end of the cable.
  • shielded electrical cable 201 includes a first through sixth conductor sets 201a-201f that are distributed along a width "W" greater than about 1.6 cm.
  • An additional seventh and eighth conductor set 20 lg, 20 lh extend the width of the cable beyond 1.6 cm, and a first and second ground/drain wire 221a, 221b are disposed at either end of the cable.
  • shielded electrical cable 202 includes a first through sixth conductor sets 202a-202f that are distributed along a width "W" greater than about 1.6 cm.
  • a first and second ground/drain wire 222a, 222b are disposed at either end of the cable.
  • shielded electrical cable 203 includes a first through sixth conductor sets 203a-203f and a group of four sidebands 203g, which are distributed along a width "W" greater than about 1.6 cm.
  • a first and second ground/drain wire 223a, 223b are disposed at either end of the cable.
  • shielded electrical cable 204 includes a first through sixth conductor sets 204a-204f and a wide minimum separation "d2E" between the third and fourth conductor sets 204c, 204d, all distributed along a width "W" greater than about 1.6 cm.
  • a first and second ground/drain wire 224a, 224b are disposed at either end of the cable.
  • shielded electrical cable 205 includes a first through sixth conductor sets 205a-205f that are distributed along a width "W" greater than about 1.6 cm.
  • at least one of the shielding films e.g., second shielding filml40 as shown in FIG. 1 remains flat as described, for example, in U.S. Patent Application Serial No. 61/378877 entitled CONNECTOR
  • FIG. 3 A An example of a shielded electrical cable 300 is shown in FIG. 3 A, which shows a schematic cross-sectional view of the cable.
  • the shielded electrical cable 300 had an aluminum foil first shielding film 330 and an aluminum foil second shielding film 340 on either side of the cable, bonded together with adhesive layer 316.
  • the cable was prepared according to the procedure described in U.S. Patent Application Serial No. 61/378877 entitled CONNECTOR ARRANGEMENTS FOR ELECTRICAL CABLES (Attorney Docket No. 66887US002), filed on August 31, 2010.
  • the aluminum foil was 0.072 mm thick, and the adhesive layer comprised a polyolefin based adhesive that was 0.0254 mm thick and enclosed nine conductor sets 310a-3 lOi of paired conductors.
  • the nine conductor sets 310a-3 lOi were disposed in a width "W" of 2.44 cm.
  • Each of the paired conductors included two 30 AWG silver plated copper wires insulated with polyolefin having an outer diameter of 0.79 mm.
  • the shielded electrical cable 300 also included a group of five sidebands 3 lOj (each sideband was 30 AWG tin plated copper wires insulated with polyolefin having an outer diameter of 0.79 mm) in the center, as well as 4 uninsulated 30 AWG tin plated copper drain wires within the construction as shown.
  • FIG. 3B shows an overhead schematic view of the shielded electrical cable 300.
  • the electrical characteristics of the cable e.g., impedance
  • TDR time domain reflectometer
  • FIG. 4 shows a plot of the impedance data from the shielded electrical cable of FIGS. 3A-3B, ranging from one meter to two meters, in 0.2 meter intervals.
  • Item 1 is a shielded electrical cable, comprising: at least six conductor sets extending along a length of the cable and being spaced apart from each other along a width of the cable, each conductor set including two or more insulated conductors; first and second end conductors separated by a width distance of at least 1.6 cm; first and second shielding films disposed on opposite first and second sides of the cable, the first and second shielding films including cover portions and pinched portions arranged such that, in transverse cross section, the cover portions of the first and second shielding films in combination substantially surround each conductor set, and the pinched portions of the first and second shielding films in combination form pinched portions of the cable on each side of each conductor set; and an adhesive layer bonding the first shielding film to the second shielding film in the pinched portions of the cable; wherein: a maximum separation between the cover portions of the first and second shielding films is D; a first minimum separation between the pinched portions of the first and second shielding films is
  • Item 2 is the shielded electrical cable of item 1 , wherein the width distance is at least 2 cm.
  • Item 3 is the shielded electrical cable of item 1 or item 2, wherein the width distance is at least 3 cm.
  • Item 4 is the shielded electrical cable of item 1 to item 3, wherein dl/D is less than 0.20.
  • Item 5 is the shielded electrical cable of item 1 to item 4, wherein dl/D is less than 0.15.
  • Item 6 is the shielded electrical cable of item 1 to item 5, wherein dl/D is less than 0.10.
  • Item 7 is the shielded electrical cable of item 1 to item 6, wherein d2/D is greater than 0.40.
  • Item 8 is the shielded electrical cable of item 1 to item 7, wherein d2/D is greater than 0.45.
  • Item 9 is the shielded electrical cable of item 1 to item 8, wherein d2/D is greater than 0.50.
  • Item 10 is the shielded electrical cable of item 1 to item 9, wherein the impedance of each conductor set over the length of at least 1 meter, is within 8% of the average impedance of the conductor set over the same length.
  • Item 1 1 is the shielded electrical cable of item 1 to item 10, wherein the impedance of each conductor set over the length of at least 1 meter, is within 5% of the average impedance of the conductor set over the same length.
  • Item 12 is the shielded electrical cable of item 1 to item 1 1, wherein the impedance of each conductor set over the length of at least 1 meter, is within 1% of the average impedance of the conductor set over the same length.
  • Item 13 is the shielded electrical cable of item 1 to item 12, wherein the impedance of each conductor set over the length of at least 2 meters, is within 10% of the average impedance of the conductor set over the same length.
  • Item 14 is the shielded electrical cable of item 1 to item 13, wherein the impedance of each conductor set over the length of at least 2 meters, is within 8% of the average impedance of the conductor set over the same length.
  • Item 15 is the shielded electrical cable of item 1 to item 14, wherein the impedance of each conductor set over the length of at least 2 meters, is within 5% of the average impedance of the conductor set over the same length.
  • Item 16 is the shielded electrical cable of item 1 to item 15, wherein the impedance of each conductor set over the length of at least 2 meters, is within 1% of the average impedance of the conductor set over the same length.

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Abstract

L'invention porte de façon générale sur des câbles électriques blindés (100) qui constituent un câble ruban électrique blindé. En particulier, au moins six ensembles de conducteurs individuels (110a-110f) de conducteurs isolés (112, 113) sont blindés par des films de blindage (130, 140) qui comprennent des parties de revêtement (150) et des parties pincées (155) séparant les parties de revêtement (150), sur une largeur de câble (W) d'au moins 1,6 cm, de façon à former un câble ruban électrique blindé.
PCT/US2012/064445 2011-11-29 2012-11-09 Câble ruban large à canaux multiples WO2013081800A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201290001020.5U CN204270723U (zh) 2011-11-29 2012-11-09 屏蔽电缆

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201161564532P 2011-11-29 2011-11-29
US61/564,532 2011-11-29

Publications (1)

Publication Number Publication Date
WO2013081800A1 true WO2013081800A1 (fr) 2013-06-06

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4155613A (en) * 1977-01-03 1979-05-22 Akzona, Incorporated Multi-pair flat telephone cable with improved characteristics
WO2010148157A1 (fr) * 2009-06-19 2010-12-23 3M Innovative Properties Company Câble électrique blindé et son procédé de fabrication

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4155613A (en) * 1977-01-03 1979-05-22 Akzona, Incorporated Multi-pair flat telephone cable with improved characteristics
WO2010148157A1 (fr) * 2009-06-19 2010-12-23 3M Innovative Properties Company Câble électrique blindé et son procédé de fabrication

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
3M: "3M Twin Axial Cable SL8800 Series", 7 April 2011 (2011-04-07), XP055054223, Retrieved from the Internet <URL:http://www.mouser.com/pdfdocs/3MTwinAxialCableSL8800Series-2.pdf> [retrieved on 20130221] *
3M: "3M Twin Axial Cable, SL8800 series - Datasheet", 23 October 2009 (2009-10-23), XP055054177, Retrieved from the Internet <URL:http://www.heilind.com/marketing/documents/3M__TwinAx_TS-2360.pdf> [retrieved on 20130221] *

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