KR100917284B1 - Unshielded twisted pair cable - Google Patents

Abstract

A UTP(Unshielded Twisted Pair) cable is provided to prevent the crosstalk by forming an inner pair unit with the smaller pitch than the pitch of an outer pair unit. A UTP cable includes a tensile member(30), an inner pair unit(10), an outer pair unit(20), and a sheath(40). The tensile member improves the tension of the UTP cable. The inner pair unit and the outer pair unit include a plurality of pair units(2). The plurality of pair unit are twisted with a predetermined pitch. The outer pair unit surrounds the inner pair unit. The sheath surrounds the outer pair unit. The twist pitch of the pair units of the inner pair unit is smaller than the twist pitch of the pair units of the outer pair unit. The pitch of the inner pair unit is smaller than the pitch of the outer pair unit.

Description

UTP cable {UNSHIELDED TWISTED PAIR CABLE}

The present invention relates to a UTP cable, and more particularly, to a UTP cable having a structure capable of preventing cross talk between a pair unit to improve transmission characteristics.

In general, a UTP cable, which is used as a communication cable, spirally twists the conductors 1 formed by covering a conductor such as copper with an insulator as shown in FIG. 2 to form a pair unit 2. It is made in the form of a plurality of such individual pair unit 2 collected and recoated.

UTP cable is an unshielded twisted pair cable widely used for establishing a communication network such as a LAN, for example, and as shown in FIG. 2, a pair unit of conductive wires in which two insulated conductors 1 are spirally twisted together It is provided inside.

Such UTP cable has recently emerged as an important problem in increasing information transmission capability according to the development of information and communication technologies such as ATM and Ethernet, and has been developed and supplemented in order to realize such an increase in transmission capability.

On the other hand, according to the global convention, the UTP cable is classified by an identifier and a number (Category or Cat.) According to the signal transmission capability, the higher the number has a higher transmission characteristics.

For example, 16 MHz for Cat. 3, 20 MHz for Cat. 4, and 100 MHz for Cat. 5 can be transmitted. The higher the modulation frequency, the greater the amount of information per unit time.

 However, the higher the modulation frequency, the higher the noise phenomenon due to the interference between the cable and the change in the impedance inside the wire, which makes it difficult to separate the signal from the signal receiver.

For this reason, the signal transmission limit of UTP cable has been considered to be about 155Mbps (Megabit per sec).

However, according to the recent development of information transmission equipment technology, it is possible to compensate for signal degradation due to interference in a cable by using a compensation method by digital signal processing (DSP) equipment or the like. The 1000Mbps (1Gbps) transmission was made possible, and the IEEE (Institute of Electrical and Electronics Engineers) standard committee officially standardized 1000 Base-T as an Ethernet standard by 1999.

On the other hand, the recent development of related technologies, such as moving picture transmission technology, is likely to require a cable that can enable a higher level of information transmission in the near future. R & D is being carried out competitively, and a special committee for establishing a standard for high-speed information transmission cable is being established in IEEE.

However, in order to increase transmission capacity, high frequency is generally used, and when such high frequency is used, internal interference (Power Sum Near and Cross Talk; PSNEXT) occurs inside the UTP cable, and a UTP cable composed of a plurality of pair units is used. In this case, minimizing the interference has an important effect on improving the signal transmission rate.

Since the interference characteristics of the UTP cable vary depending on the insulator outer diameter, pitch, and the like of the conductors constituting the pair unit, it is very important to properly tune these factors within the range that can best transmit the signal.

For example, if two pair units are provided in a sheath, the numerical analysis is performed using a conventional finite element method (FEM) algorithm, which is optimal when the outer diameter and pitch of the insulators of the conductors forming one and the other pair unit are different. Will have the characteristics of.

In particular, in the case of a UTP cable composed of a plurality of pair units, even if the pitch of adjacent pair units in the cable is configured to be different from each other, if the pair units are gathered in a twisted form in two or more units, the cross talk between the paired pair unit parts is performed. There is a problem that the signal transmission rate is lowered, such as causing a communication failure.

The present invention has been devised to solve the above problems, and an object thereof is to provide a UTP cable having a structure which prevents crosstalk between internal pair units of adjacent UTP cables.

Another object of the present invention is to provide a UTP cable having a large pitch and an aggregate pitch condition of a pair unit that can suppress the occurrence of crosstalk.

It is still another object of the present invention to form a plurality of pairs of pairs of inner pair unit parts gathered on the inner layer and outer pair unit parts gathered on the outer layer differently by a predetermined length or more, so that the difference between the inner and outer large pitches and the gathered pitch is different. Therefore, to prevent the occurrence of crosstalk occurring inside the UTP cable to minimize the communication failure and to provide a UTP cable to improve the transmission rate of the signal.

In the UTP cable according to the present invention for achieving the above object, a plurality of pair units of a tension member for improving the tensile force of the cable, and a plurality of pair units twisted spirally with each other at a constant large pitch of the insulation coating is a constant pitch. The inner pair unit part twisted together with each other, and the outer pair unit part twisted together at a constant set pitch are arranged in a plurality of pair units spirally wound to each other at a constant pitch. And a UTP cable including a sheath surrounding the outer pair unit, wherein the large pitch of the pair units of the inner pair unit is smaller than the large pitch of the pair units of the outer pair unit, and The aggregate pitch is formed smaller than the aggregate pitch of the outer pair unit portion.

Here, the large pitch of the pair units of the inner pair unit part is set to 8mm or more and 12mm or less, it is preferable that the large pitch of the pair units of the outer pair unit part is set to 15mm or more and 20mm or less.

Further, the assembled pitch of the inner pair unit portion and the outer pair unit portion is 80 mm or more and 500 mm or less, and the difference between the assembled pitch of the inner pair unit portion and the assembled pitch of the outer pair unit portion is set to 20 mm or more.

On the other hand, a fixing tape is additionally interposed between the outer fair unit portion and the sheath.

In addition, the fixing tape is preferably made of a polyester (Polyester) material.

According to the present invention, the large pitch of the pair units of the inner pair unit portion is formed smaller than the large pitch of the pair units of the outer pair unit portion, and the collective pitch of the inner pair unit portion is formed smaller than the aggregate pitch of the outer pair unit portion. By increasing the difference in twist between the inside and the outside, it is possible to suppress the occurrence of crosstalk occurring inside the UTP cable, thereby minimizing communication failure and improving the signal transmission rate.

The present invention as described above can exhibit an effect that can be used very usefully even in the case of 10 Gigabit transmission as a signal transmission system of a communication cable using copper, which is particularly required to prevent alien crosstalk.

Hereinafter, the configuration of the present invention will be described with reference to the accompanying drawings.

Prior to this, terms used in the present specification and claims should not be construed in a dictionary sense, and the inventors may properly define the concept of terms in order to explain their invention in the best way. It should be construed as meaning and concept consistent with the technical spirit of the present invention.

Therefore, the configuration shown in the embodiments and drawings described herein are only preferred embodiments of the present invention, and do not represent all of the technical spirit of the present invention, various equivalents that may be substituted for them at the time of the present application It is to be understood that variations may exist.

1 is a cross-sectional view of a UTP cable according to the present invention, and FIG. 2 is a side view illustrating a pair unit 2 of a UTP cable.

1 and 2, the UTP cable 100 according to the present invention, the tension member 30 for improving the tensile force of the cable, and the two or more insulation-coated conductors (1) coated spirally with a constant large pitch The plurality of pair units 2 twisted by the inner pair unit 10 is twisted to each other at a constant set pitch, and the two or more conductive wires 1 insulated and wrapped around the outside of the inner pair unit 10 is constant UTP cable including a plurality of pair unit 2 twisted spirally with each other in a large pitch pitch and an outer pair unit portion 20 twisted to each other at a constant collective pitch, and the sheath 40 surrounding the outer pair unit unit 20 (UTP Cable), the large pitch of the pair unit 2 of the inner pair unit unit 10 is formed smaller than the large pitch of the pair unit 2 of the outer pair unit unit 20, the inner pair unit unit The aggregate pitch of 10 is greater than the aggregate pitch of the outer pair unit 20. It is formed.

Hereinafter, each component will be described in detail.

First, in order to improve the tensile force of the UTP cable, a tension member 30 is provided at the center, and the tension member 30 is made of any one or more of aramid yarn, glass yarn, steel wire, or FRP (Fiberglass Reinforced Plastics). desirable.

On the other hand, the pair unit 2 of the inner pair unit 10 and the outer pair unit 20 has a conductor (1) is provided to enable the transmission of data converted into an electrical signal by coating an insulator on the conductor, respectively. At least two twists are formed.

In addition, in order to minimize internal interference occurring between the pair units in the cable, as shown in FIG. 1, when the pair unit is interleaved in two or more layers, the pitch between the adjacent pair units 2 is differently adjusted. However, the large pitch of the inner pair unit 10 is preferably formed at least 3 mm larger than the large pitch of the outer pair unit 20.

In this case, when the pitch of the pair unit 2 of the pair unit 10 is 8 mm or less, the length of the conducting wire 1 increases to increase data loss, and when the pitch is 20 mm or more, the structure is not stable to maintain the shape. it's difficult.

Therefore, the large pitch of the pair unit 2 of the inner pair unit 10 is set to 8 to 12 mm, and the large pitch of the pair unit 2 of the outer pair unit 20 is set to 15 to 20 mm. desirable.

The outer pair unit unit 20 is provided to surround the outside of the inner pair unit unit 10, and at least two conducting wires 1 are provided to cover the conductor and to transmit data converted into an electrical signal. More than one is twisted and formed.

Here, in the present embodiment, a total of 25 pair units 2 of the inner and outer pair unit units 10 and 20 is provided, but the number of the pair units 2 is not limited to this embodiment and may be variously modified. Can be.

Meanwhile, the pair unit 2 of the inner pair unit unit 10 and the outer pair unit unit 20 of the present invention may be gathered together in a state where they are twisted at a predetermined set pitch.

That is, the plurality of pair units 2 constituting the inner pair unit 10 are spiraled and twisted at a predetermined set pitch, and the inner pair unit 10 twisted at the predetermined set pitch is the outer pair unit 20. At the same time the pair unit (2) of the wrapping is twisted to a certain set pitch.

Here, if the aggregate pitch of the internal pair unit 10 is too small, less than 80 mm, the length of the conductor is increased to increase data loss, and if it is set too large, more than 500 mm, the structure becomes unstable.

Therefore, the collective pitch of the inner pair unit 10 and the outer pair unit 20 is preferably set to 80 mm or more and 500 mm or less, respectively.

In addition, in order to prevent crosstalk, the assembled pitches of the inner pair unit 10 and the outer pair unit 20 are set to different ranges, preferably, the assembled pitch of the inner pair unit 10 It is set to 20 mm or more smaller than the aggregate pitch of the pair unit unit 20.

That is, the large pitch of the inner pair unit unit 10 is formed to be smaller than the large pitch of the outer pair unit unit 20, and then the collective pitch of the inner pair unit unit 10 is the collective pitch of the outer pair unit unit 20. It is formed to be smaller, thereby making the difference between the twist between the inner pair unit 10 and the outer pair unit 20 becomes larger, thereby effectively preventing crosstalk and having a more stable signal transmission.

On the other hand, the sheath 40 surrounding the outside of the outer pair unit portion 20 is made of polyethylene, PVC, or an olefin (Olefin) -based polymer material, etc., has a form surrounding the outer pair unit portion 20.

Here, the thickness of the sheath 40 preferably has a range of 0.3 to 1.5 mm.

On the other hand, in order to more stably maintain and fix the twist of the pair unit 2 of the inner and outer pair unit portions 10 and 20 having large pitch and collective pitch as described above, the outer pair unit portion 20 and sheath A fixing tape may be additionally interposed between the 40.

Here, the fixing tape is made of a polymer resin, preferably made of polyester (Polyester).

Although the components of the present invention have been described above, the present invention is not limited thereto, and various modifications and applications are possible within the scope of the technical idea known in the art.

As mentioned above, although the present invention has been described by way of limited embodiments and drawings, the technical idea of the present invention is not limited thereto, and a person having ordinary skill in the art to which the present invention pertains, Various modifications and variations may be made without departing from the scope of the appended claims.

Since the accompanying drawings are for understanding the technical spirit of the present invention together with the detailed description of the following invention, the present invention should not be construed as limited to the matters shown in the following drawings.

1 is a cross-sectional view of a UTP cable according to the present invention.

Figure 2 is a side view showing a pair unit of the UTP cable according to the present invention.

* Description of the symbols for the main parts of the drawings *

100: youtube cable

1: wire 2: pair unit

10: inner pair unit part 20: outer pair unit part

30: tension member 40: sheath

Claims (6)

An inner pair unit portion in which a tension member for improving the tensile strength of the cable, two or more pairs of insulation-coated wires spirally twisted with each other at a constant large pitch are twisted together at a constant set pitch, and the outside of the inner pair unit portion. UTP cable including an outer pair unit part in which a plurality of pair units wrapped and insulated coated and spirally twisted into each other at a constant large pitch are twisted together at a predetermined set pitch, and a sheath surrounding the outer pair unit part (UTP Cable) )as, The large pitch of the pair units of the inner pair unit portion is formed smaller than the large pitch of the pair units of the outer pair unit portion, the aggregate pitch of the inner pair unit portion is formed smaller than the set pitch of the outer pair unit portion cable. The method of claim 1, UTP cable, characterized in that the large pitch of the pair unit of the inner pair unit is 8mm or more and 12mm or less. The method of claim 1, UTP cable, characterized in that the large pitch of the pair unit of the outer pair unit unit is not less than 15mm 20mm. The method according to any one of claims 1 to 3, The assembled pitch of the inner pair unit and the outer pair unit is 80 mm or more and 500 mm or less, and the difference between the assembled pitch of the inner pair unit and the assembled pitch of the outer pair unit is 20 mm or more. The method of claim 1, UTP cable, characterized in that the fixing tape is additionally interposed between the outer pair unit and the sheath. The method of claim 5, UTP cable, characterized in that the fixing tape is made of a polyester (Polyester) material.

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