JP2009230911A - Twisted pair cable - Google Patents
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- JP2009230911A JP2009230911A JP2008072164A JP2008072164A JP2009230911A JP 2009230911 A JP2009230911 A JP 2009230911A JP 2008072164 A JP2008072164 A JP 2008072164A JP 2008072164 A JP2008072164 A JP 2008072164A JP 2009230911 A JP2009230911 A JP 2009230911A
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- 239000004020 conductor Substances 0.000 claims abstract description 32
- 239000012212 insulator Substances 0.000 claims abstract description 29
- 239000006260 foam Substances 0.000 claims abstract description 11
- 230000006835 compression Effects 0.000 claims abstract description 10
- 238000007906 compression Methods 0.000 claims abstract description 10
- 229920003023 plastic Polymers 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 4
- -1 polypropylene Polymers 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 17
- 238000005187 foaming Methods 0.000 abstract description 5
- 230000006866 deterioration Effects 0.000 abstract 1
- 238000009413 insulation Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 229920003020 cross-linked polyethylene Polymers 0.000 description 3
- 239000004703 cross-linked polyethylene Substances 0.000 description 3
- 208000032365 Electromagnetic interference Diseases 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000036039 immunity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
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Abstract
Description
本発明は、ＬＡＮ用若しくはＦＡ用の通信、制御用配線として使用される１００ＢＡＳＥ−ＴＸ通信に適用可能なツイストペアケーブルに関する。 The present invention relates to a twisted pair cable applicable to LAN or FA communication and 100BASE-TX communication used as control wiring.
ＬＡＮ（Local Area Network）の伝送、またはＦＡ（Factory Automation System）のような工場内の通信ネットワークの伝送において、配線に稼働部を有する場合には柔軟性や耐屈曲性を持たせるために撚線導体が使用される。また、イミュニティ（Immunity：妨害耐性）とＥＭＩ（Electro Magnetic Interference：電磁妨害）の対策としてケーブルに遮蔽を施すこともよく行われる。 In the case of LAN (Local Area Network) transmission or factory communication network transmission such as FA (Factory Automation System), if the wiring has an operating part, it is stranded to give flexibility and bending resistance A conductor is used. In addition, as a countermeasure against immunity (Immunity) and EMI (Electro Magnetic Interference), a cable is often shielded.
ところで、撚線導体の場合、通常の撚線導体では同じ断面積の単線導体と比較して導体径が太くなり、その上減衰量も劣るため伝送距離が短くなるという欠点がある。例えばＬＡＮ用のツイストペアケーブルを用いた伝送において最大伝送長は１００ｍとされているが、これは１００ｍのうちの９０ｍに単線導体を用いた場合のことであり、撚線導体だけでケーブルを構成する場合にはケーブル長はより短くなる。 By the way, in the case of a stranded wire conductor, a normal stranded wire conductor has a drawback that the conductor diameter is thicker than that of a single wire conductor having the same cross-sectional area, and the attenuation is also inferior, so that the transmission distance is shortened. For example, in transmission using a twisted pair cable for LAN, the maximum transmission length is set to 100 m. This is a case where a single wire conductor is used for 90 m of 100 m, and the cable is constituted by only a stranded wire conductor. In some cases, the cable length is shorter.
一方、遮蔽は絶縁コアの静電容量を大きくする働きがあり、遮蔽前の特性を維持させるにはさらに絶縁外径を太くする必要がある。以上の結果、絶縁体の外径は一般のＬＡＮ用モジュラプラグに接続できる上限（通常１．０２ｍｍ）を超える場合がある。 On the other hand, the shielding functions to increase the capacitance of the insulating core, and it is necessary to further increase the insulation outer diameter in order to maintain the characteristics before shielding. As a result, the outer diameter of the insulator may exceed the upper limit (usually 1.02 mm) that can be connected to a general LAN modular plug.
このような状況から、撚線導体を圧縮した圧縮撚線導体を使用して導体径を細くしたケーブルが知られている（例えば、特許文献１、特許文献２参照）。また、絶縁体を発泡化させて絶縁外径を細くしたケーブルも知られている（例えば、特許文献３参照）。 From such a situation, a cable in which a conductor diameter is reduced using a compressed twisted wire conductor obtained by compressing a twisted wire conductor is known (for example, see Patent Document 1 and Patent Document 2). In addition, a cable in which an insulating body is foamed to reduce an insulating outer diameter is also known (see, for example, Patent Document 3).
上記したように、従来から導体径を細くするために圧縮撚線導体を用いたり、絶縁外径を細くするために絶縁体を発泡化させたりすることが行われていたが、圧縮撚線導体を用いても通常のポリエチレン（ＰＥ）絶縁（充実層絶縁）では絶縁外径が太く、コネクタ接続が困難であるという問題は依然として存在していた。 As described above, conventionally, a compressed twisted wire conductor has been used to reduce the conductor diameter, or an insulator has been foamed to reduce the insulation outer diameter. However, the conventional polyethylene (PE) insulation (enriched layer insulation) still has a problem that the insulation outer diameter is large and connector connection is difficult.
また、絶縁体を発泡化させる場合には、発泡により絶縁コアの機械的強度が弱くなり、ケーブルの製造中または布設時の負荷により電気特性が悪化するほか、耐圧不良、混線等の問題もあった。 In addition, when foaming the insulator, the mechanical strength of the insulating core is weakened due to foaming, the electrical characteristics deteriorate due to the load during cable manufacture or laying, and there are also problems such as defective withstand voltage and crosstalk. It was.
本発明は上記のような課題を解決するためになされたもので、導体径を細くするとともに絶縁体外径も細くしながら伝送特性が良好で通常のＬＡＮ用モジュラプラグに容易に接続もできるツイストペアケーブルを提供するものである。 The present invention has been made in order to solve the above-described problems. A twisted pair cable having good transmission characteristics while being thin in the conductor diameter and thin in the outer diameter of the insulator and can be easily connected to a modular plug for LAN. Is to provide.
この目的を達成するために本発明のツイストペアケーブルの第１の態様は、絶縁体が被覆された圧縮撚線導体の２本が撚り合わされて１対の心線が形成され、心線の２対が撚り合わされ、これらの心線の間に介在が配置され、その周囲に順次外層に向かって遮蔽層及び外被が設けられてなるツイストペアケーブルにおいて、絶縁体は発泡層から構成されるとともに、発泡層の表面が無発泡化された層からなることを特徴とする。 In order to achieve this object, according to a first aspect of the twisted pair cable of the present invention, two pairs of compressed stranded conductors coated with an insulator are twisted to form a pair of core wires, and two pairs of core wires are formed. In a twisted pair cable in which an intervening member is disposed between these core wires and a shield layer and a jacket are sequentially provided around the core wire toward the outer layer, the insulator is formed of a foam layer and foamed. The surface of the layer consists of a non-foamed layer.
また本発明のツイストペアケーブルの第２の態様は、第１の態様において、発泡層は発泡率が１７〜２３％であることを特徴とする。 The second aspect of the twisted pair cable of the present invention is characterized in that, in the first aspect, the foam layer has a foam ratio of 17 to 23%.
さらに本発明のツイストペアケーブルの第３の態様は、第１または第２の態様において、無発泡層の厚さが０．０４〜０．０６ｍｍであることを特徴とする。 Furthermore, the third aspect of the twisted pair cable of the present invention is characterized in that, in the first or second aspect, the thickness of the non-foamed layer is 0.04 to 0.06 mm.
また本発明のツイストペアケーブルの第４の態様は、第１から第３の態様において、２対の心線のうち１方の対の撚り合わせの対ピッチを１５ｍｍ若しくは１６ｍｍとし、他方の対の対ピッチを１７ｍｍ、１８ｍｍ若しくは１９ｍｍのうちの何れか一つとしたことを特徴とする。 Further, a fourth aspect of the twisted pair cable of the present invention is the first to third aspects, wherein the twisting pair pitch of one pair of the two pairs of core wires is 15 mm or 16 mm, and the other pair of pairs is paired. The pitch is any one of 17 mm, 18 mm, and 19 mm.
さらに本発明のツイストペアケーブルの第５の態様は、第１から第４の態様において、２対の心線の対間距離が０．２ｍｍ以上であることを特徴とする。 Furthermore, the fifth aspect of the twisted pair cable of the present invention is characterized in that, in the first to fourth aspects, the distance between the two pairs of core wires is 0.2 mm or more.
また本発明のツイストペアケーブルの第６の態様は、第１から第５の態様において、心線と遮蔽層との間の距離が０．３ｍｍ以上であることを特徴とする。 According to a sixth aspect of the twisted pair cable of the present invention, in the first to fifth aspects, the distance between the core wire and the shielding layer is 0.3 mm or more.
さらに本発明のツイストペアケーブルの第７の態様は、第１から第６の態様において、介在としてデニール数の異なる複数本のプラスチック紐が挿入されていることを特徴とする。 Furthermore, the seventh aspect of the twisted pair cable of the present invention is characterized in that, in the first to sixth aspects, a plurality of plastic cords having different denier numbers are inserted as interpositions.
また本発明のツイストペアケーブルの第８の態様は、第７の態様において、デニール数の異なる複数本のプラスチック紐は、６，０００デニール２本及び１１，０００デニール３本のポリプロピレン・スプリット紐であることを特徴とする。 Further, an eighth aspect of the twisted pair cable of the present invention is the seventh aspect according to the seventh aspect, wherein the plurality of plastic cords having different denier numbers are polypropylene split cords of two 6,000 deniers and three 11,000 deniers. It is characterized by that.
本発明によれば、圧縮撚線導体を用い、表面を無発泡化した発泡層を絶縁体とし、対ピッチ、対間距離、心線と遮蔽層との間の距離、介在紐のデニール数などを考慮することにより、ケーブルとしての減衰量や近端漏話減衰量などの伝送特性に優れ、絶縁体の強度も確保でき、また導体径や絶縁体外径を抑えることができるＬＡＮ用モジュラプラグに接続も可能なツイストペアケーブルを提供することができる。 According to the present invention, a foamed layer having a non-foamed surface using a compression stranded conductor is used as an insulator, and the pitch, the distance between the pairs, the distance between the core wire and the shielding layer, the number of deniers of the interlaced string, etc. By considering the above, it is connected to a modular plug for LAN that has excellent transmission characteristics such as cable attenuation and near-end crosstalk attenuation, can ensure the strength of the insulator, and can suppress the conductor diameter and the outer diameter of the insulator. Also possible twisted pair cable can be provided.
以下、本発明のツイストペアケーブルの好ましい実施の形態について図面を参照して説明する。 Hereinafter, a preferred embodiment of a twisted pair cable of the present invention will be described with reference to the drawings.
図１は本発明のツイストペアケーブルの断面図である。図１において、ツイストペアケーブル１は、絶縁体２が被覆された圧縮撚線導体３を２本撚り合わせて１対の心線とし、この心線が２対撚り合わせられている。ツイストペアケーブルの場合は４対のケーブルもよく知られているが、４対よりも２対の方が心線の対間距離や心線と遮蔽層との間の距離に対する自由度をより高く確保できる。また、１００ＢＡＳＥ−ＴＸ通信において２対のツイストペアケーブルでも４対と比較して十分満足する伝送特性を有することが可能である。 FIG. 1 is a cross-sectional view of a twisted pair cable of the present invention. In FIG. 1, a twisted pair cable 1 is formed by twisting two compression twisted wire conductors 3 covered with an insulator 2 to form a pair of core wires, and these core wires are twisted in two pairs. In the case of twisted pair cable, four pairs of cables are also well known, but two pairs have more flexibility in the distance between the pair of cores and the distance between the core and the shielding layer than four pairs. it can. Further, in 100BASE-TX communication, even two pairs of twisted pair cables can have transmission characteristics that are sufficiently satisfied as compared with four pairs.
２対の心線の周囲には介在５としてプラスチック紐が充填されており、外観を丸型に整えるとともに２本の心線の対間距離や心線と遮蔽層との間の距離が調整されるようになっている。 Plastic cords are filled around the two pairs of core wires as an interposition 5, and the appearance is rounded and the distance between the two core wires and the distance between the core wires and the shielding layer are adjusted. It has become so.
そして、介在５が充填されて形が整えられた周囲には第１の遮蔽層６及び第２の遮蔽層７が被覆されており、さらにこれらの遮蔽層の周囲に外被８が被覆されている。 Then, the first shielding layer 6 and the second shielding layer 7 are covered around the periphery filled with the intervening 5 and the outer cover 8 is covered around these shielding layers. Yes.
ここで、圧縮撚線導体３は導体として軟銅線７本を撚り合わせ、所定の圧縮率で圧縮し、導体径を低減させたものを用いている。 Here, the compression twisted wire conductor 3 is made by twisting seven annealed copper wires as conductors, compressing them at a predetermined compression rate, and reducing the conductor diameter.
また絶縁体２は図２に示すように発泡層２ａと表面の無発泡層２ｂとから構成されている。発泡層２ａとしては発泡架橋ポリエチレン（フォームスキン架橋ポリエチレン）が被覆されており、この発泡架橋ポリエチレン（発泡架橋ＰＥ）の発泡率は１７〜２３％の範囲であることが好ましい。発泡率が１７％未満では、目的とする絶縁体外径の細径化及び必要とする伝送特性が得られず、発泡率が２３％を超すと絶縁体の強度が確保できないという理由からである。 Further, as shown in FIG. 2, the insulator 2 includes a foamed layer 2a and a non-foamed layer 2b on the surface. The foam layer 2a is covered with foam-crosslinked polyethylene (foam skin-crosslinked polyethylene), and the foaming rate of the foam-crosslinked polyethylene (foam-crosslinked PE) is preferably in the range of 17 to 23%. This is because if the expansion ratio is less than 17%, the desired outer diameter of the insulator and the required transmission characteristics cannot be obtained, and if the expansion ratio exceeds 23%, the strength of the insulator cannot be secured.
また、無発泡層２ｂを設ける理由は、絶縁体をすべて発泡層から構成するよりも強度的な低下を防ぐことができるためである。なお、無発泡層の厚さは０．０４ｍｍ〜０．０６ｍｍが好ましい。無発泡層の厚さが０．０４ｍｍよりも薄くなると強度低下の防止の効果を奏することができず、また０．０６ｍｍより厚くなると目的とする絶縁体外径の細径化及び必要とする伝送特性が得られなくなるからである。 The reason why the non-foamed layer 2b is provided is that it is possible to prevent the strength from being lowered as compared with the case where the insulator is entirely composed of the foamed layer. The thickness of the non-foamed layer is preferably 0.04 mm to 0.06 mm. If the thickness of the non-foamed layer is less than 0.04 mm, the effect of preventing strength reduction cannot be obtained. If the thickness of the non-foamed layer is more than 0.06 mm, the desired insulator outer diameter is reduced and the required transmission characteristics are obtained. It is because it becomes impossible to obtain.
介在５は心線の対間距離や心線と遮蔽層との間の距離を確保するために必要なもので、通常プラスチック紐、例えばポリプロピレン・スプリット紐（Ｐ．Ｐ．スプリット紐）が用いられる。Ｐ．Ｐ．スプリット紐は太さが種々のものが用いられるが、本発明では異なるデニール数の複数本のＰ．Ｐ．スプリット紐、即ち６，０００デニールのもの２本、１１，０００デニールのもの３本を用いると効果が高い。 The interposition 5 is necessary for securing the distance between the pair of the core wires and the distance between the core wire and the shielding layer, and usually a plastic cord, for example, a polypropylene split cord (PP split cord) is used. . P. P. The split string has various thicknesses, but in the present invention, a plurality of P.P. P. Use of split cords, ie, two 6,000 denier and three 11,000 denier, is highly effective.
異なるデニール数の複数本のＰ．Ｐ．スプリット紐を用いると最密充填が可能であるという理由のために心線の対間距離や心線と遮蔽層との間の距離の自由度が高くなるからである。 Multiple P.P.s with different denier numbers. P. This is because when the split string is used, the closest packing is possible, and the degree of freedom of the distance between the pair of cores and the distance between the core and the shielding layer is increased.
また、ケーブルを製造するにあたり、Ｐ．Ｐ．スプリット紐の配置を工夫することで、ケーブル完成後の伝送特性の向上、外径の安定化が図られることが明らかとなった。 Also, when manufacturing cables, P.I. P. It has been clarified that by improving the arrangement of the split string, the transmission characteristics after the cable is completed can be improved and the outer diameter can be stabilized.
図３はケーブル製造に際してのＰ．Ｐ．スプリット紐の配置状況を示した図で、（ａ）は本発明のケーブルに用いる配置状況である。なお、（ｂ）、（ｃ）は比較のために示した配置状況である。本図においては遮蔽層及び外被は図示を省略している。 FIG. 3 shows the P.P. P. It is the figure which showed the arrangement | positioning condition of a split string, (a) is the arrangement | positioning condition used for the cable of this invention. Note that (b) and (c) are the arrangement states shown for comparison. In this figure, illustration of the shielding layer and the jacket is omitted.
図３（ａ）に示すように、本発明のツイストペアケーブルは１１，０００デニール（ｄ）のＰ．Ｐ．スプリット紐３本（５ａ、５ｂ、５ｃ）と６，０００ｄのＰ．Ｐ．スプリット紐２本（５ｄ、５ｅ）を配置してケーブルを製造する。Ｐ．Ｐ．スプリット紐をこのように配置してケーブルを製造すると、心線の対間距離や心線と遮蔽層との間の距離の調整の自由度が高くなり、より優れた伝送特性を有するケーブルを得ることができる。 As shown in FIG. 3 (a), the twisted pair cable of the present invention has a P.P. of 11,000 denier (d). P. Three split strings (5a, 5b, 5c) and a 6,000d P.P. P. A cable is manufactured by arranging two split strings (5d, 5e). P. P. When a cable is manufactured by arranging the split strings in this way, the degree of freedom in adjusting the distance between the pair of cores and the distance between the core and the shielding layer is increased, and a cable having more excellent transmission characteristics is obtained. be able to.
一方本発明との比較のために、同一のデニール数のＰ．Ｐ．スプリット紐を用いた例を図３（ｂ）及び図３（ｃ）に示す。図３（ｂ）は１１，０００ｄのＰ．Ｐ．スプリット紐４本（５ｆ、５ｇ、５ｈ、５ｉ）を配置した例を示し、図３（ｃ）は２２，０００ｄの太いＰ．Ｐ．スプリット紐２本（５ｊ、５ｋ）を配置した例を示したものである。 On the other hand, for comparison with the present invention, P.I. P. Examples using split strings are shown in FIGS. 3 (b) and 3 (c). FIG. 3 (b) shows a P.I. P. An example in which four split strings (5f, 5g, 5h, 5i) are arranged is shown, and FIG. P. An example in which two split strings (5j, 5k) are arranged is shown.
次に、本発明のツイストペアケーブルは、２対の心線のうちの１方の対の撚り合わせの対ピッチが１５ｍｍ若しくは１６ｍｍ、他方の対の対ピッチが１７ｍｍ、１８ｍｍ若しくは１９ｍｍのうちの何れか一つの組み合わせが好ましい。このような組み合わせにすると１００ＢＡＳＥ−ＴＸ通信１００ｍに必要な減衰量や近端漏話減衰量などの伝送特性において優れた効果が得られる。なお、対ピッチについては±０．５ｍｍ程度の変動（例えば、対ピッチが１５ｍｍの場合、１４．５〜１５．５ｍｍまで）があっても伝送特性に大きな影響は及ぼさない。 Next, in the twisted pair cable of the present invention, the twisting pair pitch of one of the two pairs of core wires is 15 mm or 16 mm, and the other pair is 17 mm, 18 mm or 19 mm. One combination is preferred. With such a combination, an excellent effect can be obtained in transmission characteristics such as attenuation required for 100BASE-TX communication 100 m and near-end crosstalk attenuation. Note that even if there is a fluctuation of about ± 0.5 mm (for example, 14.5 to 15.5 mm when the pitch is 15 mm), the transmission characteristics are not greatly affected.
また、２対の心線の対間距離が０．２ｍｍ以上であることが好ましい。対間距離が０．２ｍｍ未満では心線と心線が近くなり過ぎて近端漏話減衰量特性が低下するからである。 Moreover, it is preferable that the distance between two pairs of core wires is 0.2 mm or more. This is because if the distance between the pairs is less than 0.2 mm, the core wire becomes too close to each other and the near-end crosstalk attenuation characteristic is deteriorated.
さらに、心線と遮蔽層との間の距離は０．３ｍｍ以上であることが好ましい。心線と遮蔽層との間の距離が０．３ｍｍ未満の場合には心線と遮蔽層とが近くなり過ぎるので１００ＢＡＳＥ−ＴＸ通信１００ｍに必要な減衰量特性が低下するからである。 Furthermore, the distance between the core wire and the shielding layer is preferably 0.3 mm or more. This is because when the distance between the core wire and the shielding layer is less than 0.3 mm, the core wire and the shielding layer are too close to each other, so that the attenuation characteristic required for 100BASE-TX communication 100 m is deteriorated.
なお、第１の遮蔽層６には既知のアルミ／ポリエステルラミネートテープ（ＡＬ／ＰＥＴテープ）が用いられ、第２の遮蔽層７にはやはり既知の０．１ｍｍの錫メッキ軟銅線からなる編組線が用いられる。また、外被８はポリ塩化ビニール（ＰＶＣ）樹脂が用いられる。 A known aluminum / polyester laminate tape (AL / PET tape) is used for the first shielding layer 6, and a braided wire made of a known 0.1 mm tin-plated annealed copper wire is used for the second shielding layer 7. Is used. Further, the outer cover 8 is made of polyvinyl chloride (PVC) resin.
次に本発明のツイストペアケーブルの具体的な構造例について説明する。 Next, a specific structural example of the twisted pair cable of the present invention will be described.
本発明のツイストペアケーブルにおいては、２４ＡＷＧの外径０．２０８ｍｍの軟銅線を７本撚り合わせた撚線導体について、導体径を０．６２４ｍｍから０．５６５ｍｍまで圧縮して（圧縮率約９０％）圧縮撚線導体とし、その周囲に発泡率２０％の発泡架橋ＰＥを被覆して絶縁体被覆圧縮撚線導体を作成した。この時の絶縁体表面の無発泡層の厚さは０．０５ｍｍ、絶縁体外径は０．９８ｍｍであった。 In the twisted pair cable of the present invention, the conductor diameter is compressed from 0.624 mm to 0.565 mm (compression ratio is about 90%) with respect to a stranded wire conductor in which seven 24AWG outer diameter 0.208 mm annealed copper wires are twisted together. An insulation-coated compressed stranded wire conductor was prepared by forming a compression stranded wire conductor and coating the periphery thereof with foamed crosslinked PE having a foaming rate of 20%. At this time, the thickness of the non-foamed layer on the surface of the insulator was 0.05 mm, and the outer diameter of the insulator was 0.98 mm.
この絶縁体被覆圧縮撚線導体２本を撚り合わせて心線とし、心線２本を１対として２対組み合わせて撚り合わせた。介在は６０００ｄのＰ．Ｐ．スプリット紐２本、１１０００ｄのＰ．Ｐ．スプリット紐３本を図２（ａ）に示すように配置し、第１の遮蔽層としてＡＬ／ＰＥＴテープ、第２の遮蔽層として０．１ｍｍ錫メッキ軟銅線の編組線を巻回し、ＰＶＣにより外被を設け、ケーブル外径を６．４ｍｍとした図１に示す構造のツイストペアケーブルを作成した。 Two of these insulator-coated compression twisted wire conductors were twisted to form a core wire, and two core wires were paired, and two pairs were combined and twisted. The interposition is 6000d P.I. P. 2 split strings, 11000d P.P. P. Two split cords are arranged as shown in FIG. 2 (a), and a braided wire made of AL / PET tape as a first shielding layer and a 0.1 mm tin-plated annealed copper wire as a second shielding layer is wound by PVC. A twisted pair cable having a structure shown in FIG. 1 having an outer cover and a cable outer diameter of 6.4 mm was produced.
このようなツイストペアケーブルにおいて、対ピッチ組み合わせ、心線の対間距離、心線と遮蔽層との間の距離を種々変更して１００ＢＡＳＥ−ＴＸ通信１００ｍに必要な減衰量特性、近端漏話減衰量特性を測定した。また、外観の凹凸について目視により判定した。結果を比較例とともに表１に示す。 In such a twisted pair cable, the characteristics of the attenuation required for 100BASE-TX communication 100m, the near-end crosstalk attenuation, by variously changing the combination of the pitch, the distance between the conductors, and the distance between the conductors and the shielding layer. Characteristics were measured. Moreover, the unevenness | corrugation of an external appearance was determined visually. The results are shown in Table 1 together with comparative examples.
表１に示すように、実施例１〜３はいずれも１００ＢＡＳＥ−ＴＸ通信１００ｍに必要な減衰量特性も近端漏話減衰量特性も優れており、また外観も良好だった。特に実施例１については近端漏話減衰量について最も優れた特性を示した。 As shown in Table 1, all of Examples 1 to 3 were excellent in the attenuation characteristic required for 100BASE-TX communication 100m, the near-end crosstalk attenuation characteristic, and the appearance was good. In particular, Example 1 showed the most excellent characteristics for near-end crosstalk attenuation.
それに対して比較例１は、近端漏話減衰量特性は非常に優れていたが、一方の対の対間ピッチが極めて小さいためにその対における１００ＢＡＳＥ−ＴＸ通信１００ｍに必要な減衰量特性が実用上満足のいくものではなく、外観も凹凸があり不良であった。 On the other hand, the comparative example 1 had very good near-end crosstalk attenuation characteristics, but the pair-to-pair pitch of one pair was extremely small, so the attenuation characteristics required for 100BASE-TX communication 100m in that pair were practical. It was not satisfactory, and the appearance was uneven and poor.
次に、比較例２は、心線の対間距離が短いために近端漏話減衰量が実用上満足のいく特性を有することができず、外観も凹凸があり不良であった。 Next, Comparative Example 2 was not satisfactory because the near-end crosstalk attenuation could not have practically satisfactory characteristics due to the short distance between the pairs of core wires, and the appearance was uneven.
また、比較例３は、心線の対間距離が大きいために近端漏話減衰量特性は非常に優れていたが心線と遮蔽層との間の距離が短く、１００ＢＡＳＥ−ＴＸ通信１００ｍに必要な減衰量特性が極めて悪かった。従って、外観上の問題はなかったが製品として使用することはできなかった。 In addition, Comparative Example 3 has very good near-end crosstalk attenuation characteristics due to the large distance between the pair of cords, but the distance between the cord and the shielding layer is short, which is necessary for 100BASE-TX communication 100m. The attenuation characteristics were extremely bad. Therefore, although there was no problem in appearance, it could not be used as a product.
さらに、比較例４は、やはり心線と遮蔽層との間の距離が短いことから１００ＢＡＳＥ−ＴＸ通信１００ｍに必要な減衰量特性が悪く、また外観上の問題もあった。 Furthermore, since the distance between the core wire and the shielding layer is also short in Comparative Example 4, the attenuation characteristic required for 100BASE-TX communication 100m is poor, and there is a problem in appearance.
上記したように本発明によれば、絶縁体を発泡層とし、この発泡層の表面を無発泡化することにより絶縁体の強度の低下を防ぐとともに導体径を細くし、また絶縁体外径も細くしたのでＬＡＮ用モジュラプラグへの接続を可能にし、さらに対ピッチや心線の対間距離、心線と遮蔽層との間の距離、介在の配置等を考慮することにより、１００ＢＡＳＥ−ＴＸ通信１００ｍに必要な減衰量や近端漏話減衰量などの伝送特性の向上が可能なツイストペアケーブルを提供することができる。 As described above, according to the present invention, the insulator is used as the foam layer, and the surface of the foam layer is made non-foamed to prevent the strength of the insulator from being lowered and the conductor diameter is reduced, and the insulator outer diameter is also reduced. Therefore, it is possible to connect to a modular plug for LAN, and further consider 100BASE-TX communication 100m by taking into account the pitch, distance between the cores, distance between the cores and the shielding layer, and the arrangement of the interpositions. It is possible to provide a twisted pair cable capable of improving transmission characteristics such as attenuation required for transmission and near-end crosstalk attenuation.
１ ツイストペアケーブル
２ 絶縁体
３ 圧縮撚線導体
４ 心線
５ 介在
６ 第１の遮蔽層
７ 第２の遮蔽層
８ 外被
DESCRIPTION OF SYMBOLS 1 Twisted pair cable 2 Insulator 3 Compression
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| JP2008072164A JP2009230911A (en) | 2008-03-19 | 2008-03-19 | Twisted pair cable |
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