JP5539771B2 - LAN patch cord - Google Patents

Description

  The present invention relates to a LAN patch cord, in particular, four pairs of twisted wires formed by twisting two insulated wires having a central conductor insulated, and an outer sheath covering the outer periphery of the pairs of twisted wires together. It is related with the patch cord for LAN which comprises.

  With the practical application of LAN, development of a communication cable for signal transmission suitable for high-speed communication is strongly desired. Specifically, as the transmission rate increases, it is necessary to improve the crosstalk attenuation characteristics of the communication cable. As a communication cable with improved crosstalk attenuation characteristics, for example, as disclosed in Patent Document 1, It is useful to construct the communication cable using a cross-shaped intervention. In this communication cable, twisted wires with different twisting pitches are respectively arranged in four storage areas whose cross sections are defined by the cross shape, and crosstalk attenuation characteristics between adjacent twisted wires are improved. ing.

  In addition to improvements in electrical characteristics such as the above-mentioned crosstalk characteristics, high-density mounting switches and patch panels are used in current data centers and offices. Since a large number of the cables are densely arranged in a space, it has been desired to provide a communication cable that can reduce the occupied space.

  For this reason, Patent Document 2 includes at least two pairs of twisted wires formed by twisting two insulated wires having an insulating coating on the center conductor, and an outer sheath in which the outer periphery of the twisted wires is collectively covered with an insulation coating. There is disclosed a LAN cable which is a LAN cable that optimizes the shrinkage ratio of the jacket under predetermined conditions, the outer diameter of the central conductor, and the outer diameter of the cable. By using this LAN cable, it is possible to save space as compared with the conventional LAN cable while having good electrical characteristics.

  However, since the LAN patch cord is used for a route change / switching portion of information wiring or a terminal cord, the number of times of bending is larger than that of a normal LAN cable, and further, space saving is achieved. Since the patch cord is pushed into a narrow management panel to meet the demand, there is a special feature that it can be bent with a small bending radius. Therefore, it is difficult to directly apply the structure of the LAN cable described in Patent Document 2 to the LAN patch cord, and the LAN patch cord having high resistance to repeated bending with a small radius of curvature. Development is desired.

Japanese Patent Laid-Open No. 11-53958 JP 2009-259681 A

  In view of the above-mentioned present situation, an object of the present invention is to provide a LAN patch cord that has good electrical characteristics, can save space, and has excellent bending resistance.

  The inventors of the present invention have four pairs of twisted wires formed by twisting two insulated wires having an insulation coating on a central conductor, and a jacket having a sheath that collectively covers the outer periphery of the pair of twisted wires. As a result of examining the patch cord to solve the above problems, the central conductor constituting each insulated wire is formed by twisting seven or more copper strands, and the outer diameter of the conductor is 0.4 mm. By making it as follows, it is possible to improve resistance to repeated bending with a small radius of curvature, and further, by making the outer diameter of the patch cord 4 mm or less, it is possible to improve bending resistance and save space. Found that it would be possible.

In order to achieve the above object, the gist of the present invention is as follows.
(1) A channel having a total length of 100 m or less, comprising four pairs of twisted wires formed by twisting two insulated wires with insulation coating on the center conductor, and a jacket covering the outer periphery of the pairs of twisted wires together. LAN patch cord used between
Said center conductor, a copper wire 7 to 37 present, will be twisted at a pitch of not more than 5 mm, conductor outer diameter is at 0.4mm or less and an outer diameter of said patch cord state, and are less 4 mm, A patch cord for LAN characterized by having electrical characteristics satisfying the CAT6 standard .

(2) The LAN patch cord according to (1) , wherein a twist pitch of the insulated wire is in a range of 5 to 10 mm, and is different for each pair of twisted wires .

(3) The patch cord for LAN according to (1) or (2), wherein the copper element wire has an outer diameter of 0.12 mm or less.

( 4 ) The LAN patch cord according to any one of (1) to ( 3 ), wherein a radius of curvature of the patch cord at the time of maximum bending is 4 mm or less.

( 5 ) The LAN patch according to any one of (1) to ( 4 ), wherein the material of the jacket is polyvinyl chloride, flame retardant polyethylene, polypropylene, elastomer, or fluorine resin. code.

  According to the present invention, it is possible to save space while having good electrical characteristics, and it is possible to provide a LAN patch cord having excellent bending resistance.

(a) is the figure which expanded and showed the cross section of the patch cord for LAN of this invention, (b) is among the two insulated wires which comprise each pair twisted line shown by (a) It is the figure which extracted only one of these and expanded and showed in detail. It is the figure which showed typically about one Embodiment of the wiring system using the patch cord for LAN of this invention. It is a figure for demonstrating the twist pitch of one pair twisted wire used for the patch cord for LAN of this invention. It is a figure for demonstrating the channel model used for evaluation of the electrical property of each sample of an Example and a comparative example. It is a figure for demonstrating the evaluation method of the bending resistance of each sample of an Example and a comparative example.

  Hereinafter, the configuration of the present invention and the reasons for limitation will be described with reference to the drawings.

  FIG. 1 (a) schematically shows a cross section of the LAN patch cord of the present invention for easy explanation, and FIG. 1 (b) shows each twisted pair shown in FIG. 1 (a). Only one of the two insulated wires constituting the wire is extracted and enlarged and shown in detail. FIG. 2 schematically shows an embodiment of a wiring system using the LAN patch cord of the present invention.

  As shown in FIG. 1 (a), a LAN patch cord 10 according to the present invention includes four pairs of twisted wires 20 formed by twisting two insulated wires 22 each having a central conductor 21 insulated, and the pairs of twisted wires. The outer periphery of the wire 20 is provided with an outer cover 30 that is collectively covered with an insulating coating.

  As shown in FIG. 1 (b), the center conductor 21 is formed by twisting seven or more copper strands (seven copper strands 21a to 21g in FIG. The diameter L is 0.4 mm or less, and the outer diameter M of the patch cord 10 is 4 mm or less.

The outer diameter L of the central conductor 21 is 0.4 mm or less, and the outer diameter M of the cable 10 is 4 mm or less, so that the cross-sectional area is about 1/3 of the conventional LAN patch cord. Therefore, in addition to saving space, the radius of curvature at the time of bending can be reduced and bending resistance can be improved compared to conventional cables.
Furthermore, when the same material is used, the smaller the outer diameter, the higher the bending characteristics (flexibility and resistance to continuous bending). Therefore, the central conductor 21 twists seven or more copper wires. As a result, the bending resistance can be greatly improved as compared to the case of a single copper wire.
Furthermore, there are also advantageous effects in terms of the environment such as green IT. Since the patch cord according to the present invention is a small-diameter cord, a small amount of material is required for production, CO ₂ emission for production transportation is small, and energy is not required for recycling and disposal. In addition, when the devices such as the data center are densely packed, the cords hinder the cooling of the devices. However, in the case of a thin cord, since the air flow is hardly hindered, efficient cooling is possible.

  Here, as shown in FIG. 2, the patch cord 10 is a portion such as a route change, switching, and terminal code of information wiring in an infrastructure 100 of a computer network represented by a local area network (private information network). It is used for. In particular, the wiring is concentrated near the patch panel 110 and the switching hub 120, and space is required. In addition, in the data center, the unit price of the space is expensive. Since the patch panel 110 is often reduced as much as possible and the patch cord 10 is pushed into a narrow place, the patch cord 10 has only high electric efficiency. And is required to have bending resistance. In FIG. 2, a long cable connecting the patch panel 110 and the information outlet 140 is a LAN cable 130.

  As shown in FIG. 1 (b), the center conductor 21 of the present invention is formed by twisting seven or more copper strands (in FIG. 1 (b), seven copper strands 21a to 21g), The diameter L is 0.4 mm or less. The center conductor 21 is formed by twisting seven or more copper strands 21a to 21g, thereby realizing excellent bending resistance as described above. The reason why the outer diameter L of the central conductor 21 is set to 0.4 mm or less is that if it exceeds 0.4 mm, the outer diameter of the patch cord 10 will exceed 4 mm accordingly. This is because it becomes impossible to realize the performance and space saving.

More specifically, the central conductor 21 is formed by twisting 7 to 37 copper strands at a pitch of 5 mm or less . This is because the electrical characteristics and the space-saving can be achieved at a high level by constituting 7 to 37 copper strands. The reason why the twist pitch is limited to 5 mm or less is that when it exceeds 5 mm, the structure of the electrical signal flowing through each copper wire tends to collapse and the impedance may become unstable.

  In addition, about each copper strand which comprises the said center conductor 21, soft copper, hard copper, etc. can be used, for example. Moreover, as shown in FIG.1 (b), it is preferable that the outer diameter K of the said copper strand 21a-21g is 0.12 mm or less. If the thickness exceeds 0.12 mm, the outer diameter of the copper element wire becomes too large. Therefore, when seven or more copper element wires are twisted together, the outer diameter L of the center conductor 21 may exceed 0.4 mm.

  Further, as shown in FIG. 1B, the insulated wire 22 is formed by insulatingly covering the center conductor 21. The covering film 23 that covers the central conductor 21 is not particularly limited. For example, it can be coated with a coating film 23 made of a commonly used material (PE (polyethylene), PP (polypropylene), PVC (polyvinyl chloride), elastomer, fluorine resin, or the like).

Further, the four twisted wires 20 according to the present invention are each formed by twisting the two insulated wires 22 at a predetermined twist pitch P as shown in FIG.
Here, the twist pitch P is preferably in the range of 5 to 10 mm. This is because when the twist pitch P is less than 5 mm, the number of man-hours required for twisting increases, and when it exceeds 10 mm, the structure is easily broken and the impedance becomes unstable.

  Furthermore, the twist pitch P of the insulated wire 22 is preferably different for each pair of twisted wires 20 in the cable 10. When the twist pitch P is set to the same value for all the twisted wires 20 (four twisted wires 20 in FIG. 1 (a)), the respective electrical signals interfere with each other. This is because characteristics such as equi-level far-end crosstalk deteriorate.

  The jacket 30 of the present invention is a member that covers the outer periphery of the four twisted wires 20 as shown in FIG. The configuration is not particularly limited as long as it can be insulated. However, the outer cover 30 can be made of a material of PVC, flame retardant PE, elastomer, or fluorine-based resin from the viewpoint that the outer cover 30 can be prevented from being damaged when the LAN patch cord is greatly bent. preferable.

  In addition, the LAN patch cord 10 of the present invention can further include a drain wire (not shown) on the inner side of the jacket 30 as necessary.

  Furthermore, the LAN patch cord 10 of the present invention can also include a cross interposing member (not shown) for separating the pair of twisted wires 20 inside as needed. With this cross interposing member, it is possible to improve the crosstalk attenuation characteristics between the adjacent twisted wires 20.

  Further, the LAN patch cord 10 according to the present invention has the above-described configuration, and thus has excellent bending resistance. Specifically, the radius of curvature of the patch cord 10 at the time of maximum bending is 4 mm or less. Here, the radius of curvature at the time of the maximum bending is a radius of curvature when the LAN patch cord 10 is bent to a limit (a position where it cannot be bent or a position where it is damaged).

  The above description is merely an example of the embodiment of the present invention, and various modifications can be made within the scope of the claims.

(Example)
As an embodiment, as shown in FIG. 1 (a), four pairs of twisted wires 20 formed by twisting two insulated wires 22 with a central conductor 21 insulated and coated at a twist pitch P of 5 to 10 mm; The outer periphery of the twisted pair wire 20 is collectively covered with an outer sheath 30 made of PVC. As shown in FIG. 1B, the central conductor 21 includes seven copper strands 21a to 21g (outer diameter K). : 0.10 mm) was twisted with a twist pitch of 4 mm, a conductor patch diameter L was 0.3 mm, and the patch cord 10 had an outer diameter M of 4 mm.

(Comparative Example 1)
As Comparative Example 1, the outer diameter K of the copper strands 21a to 21g is 0.21 mm, the twist pitch of the copper strand is 15 mm, the outer diameter L of the center conductor 21 is 0.6 mm, and LAN A LAN patch cord having the same configuration as in Example 1 was prepared as a sample except that the outer diameter M of the patch cord for use was 5.9 mm.

(Comparative Example 2)
As Comparative Example 1, a LAN patch cord having the same configuration as that of Example 1 was prepared as a sample, except that the central conductor was not a seven copper strands but a single copper strand.

(Evaluation method)
The LAN patch cord obtained as described above was evaluated according to the following evaluation method.

(1) Electrical characteristics with respect to the standard (CAT6) For each sample produced in the examples and comparative examples, a channel model (channel length: 100 m, permanent link length X: 90 m, patch cord lengths V, W, Y: 3 m, 2 m, and 5 m) were produced.
The electrical characteristics (a. Insertion loss (250 MHz), b. Near-end crosstalk attenuation, c. Power sum near-end crosstalk attenuation, d. Equi-level far-end crosstalk, e. End crosstalk, f. Attenuation to crosstalk ratio, g. Attenuation to power sum crosstalk ratio, h. Return loss, i. Propagation delay time, j. Delay time difference) were measured. The measured electrical property values were evaluated by calculating a margin for the CAT6 standard. The calculated results are shown in Table 1.

(2) Bending resistance As shown in FIG. 5, with respect to each sample of the example and the comparative example, the mandrel I is used so that the radius of curvature is 3.2 mm with a 100 g weight H hanging from the left and right. The bending resistance was evaluated by measuring the number of times (one reciprocation was defined as one time) until the insulated wires in the patch cord were broken (the patch cord could no longer be used). The measurement was performed three times, and the average value of the three times is shown in Table 2.

(3) Number of Filled Management Panels For the samples of Example and Comparative Example 1, the maximum number of LAN patch cords that can be filled in a management panel of size 1U (width 600 mm x height 45 mm x depth 110 mm) was measured. . Table 3 shows the measurement results.

From the results of Table 1, the channel using the sample of the example and the comparative example can clear the standard (CAT6) in all items (a to j), and it is good to use any patch cord for LAN. It turned out to be a result.
Further, from the results of Table 2, the sample of the example has a larger number of flexing times until the insulated wire is broken than the samples of Comparative Examples 1 and 2 (about three times that of Comparative Example 1, 20 of Comparative Example 2). It was found that the film has excellent bending resistance.
Furthermore, from the results in Table 3, it was found that the sample of the example can be filled with more patch cords (about 3 times) than the sample of Comparative Example 1.

  By using the LAN patch cord of the present invention, it is possible to save space while having good electrical characteristics, and furthermore, it is possible to realize excellent bending resistance.

DESCRIPTION OF SYMBOLS 10 Patch cord 20 for LAN Paired wire 21 Center conductor 21a-21g Copper element wire 22 Insulated wire 23 Insulating film 100 Infrastructure of computer network 110 Patch panel 120 Switching hub 130 LAN cable 140 Information outlet

Claims (3)

Used between channels with a total length of 100 m or less, comprising four twisted wires made by twisting two insulated wires with insulation coating on the central conductor and a jacket with the outer periphery of the twisted wires collectively covered with insulation coating A LAN patch cord,
Said center conductor, a copper wire 7 to 37 present, will be twisted at a pitch of not more than 5 mm, conductor outer diameter is at 0.4mm or less and an outer diameter of said patch cord state, and are less 4 mm, A patch cord for LAN characterized by having electrical characteristics satisfying the CAT6 standard . 2. The LAN patch cord according to claim 1 , wherein a twist pitch of the insulated wires is in a range of 5 to 10 mm, and is different for each pair of twisted wires .   The LAN patch cord according to claim 1 or 2, wherein the copper wire has an outer diameter of 0.12 mm or less.

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