KR20160088497A - UTP cable - Google Patents

Abstract

The present invention relates to an unshielded twisted pair (UTP) cable and, specifically, to an UTP cable which has an excellent data transmission ability and is structurally stable. The UTP cable includes: four pair units formed by a plurality of conducting wires twisted with each other, wherein the plurality of conducting wires include a conductor and an insulator enclosing the same; and a sheathing enclosing all of the four pair units.

Description

UTP cable {UTP cable}

The present invention relates to a UTP (Unshielded Twisted Pair) cable. Specifically, the present invention relates to a UTP cable which is excellent in data transmission capability and structurally stable.

UTP (Unshielded Twisted Pair) cable is a type of data transmission signal line that connects the environment of a general telephone line or a LAN. A plurality of pair units formed by twisting two insulated copper wires are connected by a plastic jacket ) Is a name attached to the meaning of the line wrapped.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 schematically illustrates a cross-sectional structure according to one embodiment of a conventional 4-pair UTP cable.

1, in the conventional four-pair UTP cable, each of the plurality of pair units 600 includes two conductors 60 made of a conductor 61 coated with an insulating layer 62 at a constant pitch And they are respectively formed in a twisted structure.

If the two leads 60 are separated from each other, the return loss for signal transmission may greatly increase. Therefore, the two leads 60 may be connected to each other at a constant pitch, And a plurality of the pair units 600 made up of these two conductive wires 60 are also twisted to have a constant pitch, that is, a collective pitch as a whole.

However, the impedance changes according to the twist pitch, that is, the coarse pitch and the coarse pitch. As a result, sudden signal attenuation occurs in a specific frequency band, or a current flowing in each pair unit 600 is formed A phenomenon of being adversely influenced such as generation of noise in the transmission signal of another pair unit 600 adjacent to the electromagnetic field, that is, a crosstalk phenomenon may occur rapidly.

Particularly, the crosstalk phenomenon has a serious adverse effect on the data transmission capability of the UTP cable. Particularly, in the classification of the UTP cable according to the data transmission capacity, the CAT8 (category 8), which should transmit data of 40 Gbps at a frequency of 2 Ghz or less, Of UTP cable is very important to reduce such crosstalk phenomenon.

The conventional 4-pair UTP cable attempts to suppress or minimize the reduction of the data transmission capability due to the sudden signal attenuation by matching the impedance change according to the pitch and the aggregate pitch of each of the plurality of the pair units 600. However, There was no number.

1, a conventional 4-pair UTP cable is disposed between the pair units 600 through a separator 800 including a plurality of partitions disposed between the pair units 600, The crosstalk phenomenon between the pair units 600 can not be simultaneously suppressed even with the separator 800. In particular, in the UTP cable of CAT8, the crosstalk To be less than the standard.

2 is a schematic cross-sectional view of a conventional 4-pair UTP cable according to another embodiment of the present invention. As shown in FIG. 2, the conventional 4-pair UTP cable includes the separator 800 having increased thickness of the partition walls disposed between the pair units 600 in which crosstalk phenomenon is particularly serious.

However, as the thicknesses of the plurality of partitions constituting the separator 800 are different from each other, the roundness of the cross section of the UTP cable including the separator 800 forms a complete circle is poor, so that the UTP cable If the cable is wound on a bobbin or the like, there is a problem that the cable is partially twisted to change the design of the twist pitch of the pair unit 600, thereby deteriorating the data transmission capability of the cable.

Therefore, there is a desperate need for a new UTP cable which is structurally stable while exhibiting sufficient data transmission capability required for the CAT8 UTP cable.

An object of the present invention is to provide a UTP cable that exhibits the data transmission capability required for the UTP cable of CAT8.

It is also an object of the present invention to provide a structurally stable UTP cable.

In order to solve the above problems,

And a sheath surrounding the whole of the four pair units, wherein the aggregate pitch, which is the twist pitch of the entire four pairs of units, is substantially Free, UTP cable.

Here, the pitch x of the pair units having the shortest pitch, which is the twist pitch of the plurality of wires constituting each of the four pairs, is 4 mm or more, and the pitch y , z, w) provides a UTP cable that satisfies the following conditions:

When the frequency of use of the UTP cable is 500 MHz or less,

The pitch ^{(y)> 0.0055x 2 + 0.9933x} + 0.0216

The pitch ^{(z)> 0.0114x 2 + 0.9931x} -0.0023

Pitch (w)> 0.0212x ² + 0.9466x + 0.1253

When the frequency of use of the UTP cable is 1,000 MHz or less,

The pitch ^{(y)> 0.0109x 2 + 0.9998x} -0.0165

The pitch ^{(z)> 0.0292x 2 + 0.9325x} + 0.1563

The pitch ^{(w)> 0.0624x 2 + 0.7039x} + 0.8251

When the frequency of use of the UTP cable is 1,500 MHz or less,

The pitch ^{(y)> 0.0224x 2 + 0.9216x} + 0.2455

The pitch ^{(z)> 0.063x 2 + 0.6882x} + 0.88

Pitch (w)> 0.1609x ² -0.1952 + 3.5438

When the frequency of use of the UTP cable is 2,000 MHz or less,

The pitch ^{(y)> 0.0242x 2 + 1.0121x} -0.1667

The pitch ^{(z)> 0.0982x 2 + 0.551x} + 0.9266

The pitch ^{(w)> 0.3372x 2 -1.7924x +} 7.7828

In addition, the four pair units may include an individual sheath surrounding the plurality of wires constituting the UTP cable.

Here, the four pair units include first through fourth pair units sequentially arranged in a clockwise direction, and the first pair unit and the third pair unit are formed from a resin composition containing a low-density polyethylene resin And the second pair unit and the fourth pair unit are formed from a resin composition comprising a polyvinyl chloride resin, the first pair unit having the pitch (x), and the second pair unit Wherein the first pair unit has a pitch pitch z and the third pair unit has the pitch y and the fourth pair unit has the pitch w.

The four pairs of units may include first to fourth pair units sequentially arranged in a clockwise direction, and the insulators of the first to fourth pair units may be formed of a resin composition containing a low-density polyethylene resin Wherein said first pair unit has a pitch y and said second pair unit has said pitch y or said pitch z and said second pair unit has said pitch y, , Said third pair unit has said pitch (z) and said third pair unit has said pitch (y) when said second pair unit has said pitch (z) And the four-pair unit has the above-mentioned pitch (w).

Further, the UTP cable is characterized in that the individual sheath is made of a flame retardant polyvinyl chloride resin or a flame retardant polyolefin resin.

The present invention also provides a UTP cable, which further comprises a filler including at least one partition wall for separating the first to fourth pair units from each other.

Here, the UTP cable is characterized in that the thickness of the plurality of partitions is 0.6 to 1 mm.

Further, the present invention provides a UTP cable, further comprising an external shield layer disposed between the pair unit and the sheath.

Further, the present invention provides a UTP cable, which further comprises a lip cord inside the sheath.

On the other hand, the conductor is a single wire or a twisted wire of copper, interlocking or tin-plated copper, and the insulator is made of a flame retardant polyolefin resin, a fluororesin or a halogenated polyolefin resin and the sheath is made of a flame retardant polyvinyl chloride resin or a flame retardant polyolefin resin To provide a UTP cable.

The thickness of the insulator is 0.5 to 0.61 mm, and the thickness of the sheath is 0.3 to 0.55 mm.

The UTP cable according to the present invention precisely controls the pitch of each of the plurality of pair units and substantially eliminates the aggregate pitch of the entire plurality of the pair units to reduce return loss, attenuation and crosstalk at the same time, thereby achieving an excellent effect of achieving the sufficient data transmission capability required of the UTP cable of CAT8.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 schematically illustrates a cross-sectional structure according to one embodiment of a conventional 4-pair UTP cable.
2 schematically shows a cross-sectional structure of another conventional 4-pair UTP cable.
3 schematically shows a cross-sectional structure of one embodiment of a UTP cable according to the present invention.
FIG. 4 shows a result of NEXT (near end crosstalk) evaluation of the UTP cable specimen of the embodiment.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Like reference numerals designate like elements throughout the specification.

3 schematically shows a cross-sectional structure of one embodiment of a UTP cable according to the present invention.

3, a UTP cable according to the present invention includes a plurality of, for example, two conductors 110, each of which is covered with a conductor 111 such as copper by an insulator 112, For example, four paired units 100 and a sheath 400 as an outer jacket surrounding the plurality of pair units 100, respectively.

In the plurality of pair units 100, the standards and materials of the conductors 111 and the insulators 112 are in accordance with the UTP cable international standard (ANSI / TIA / EIA 568A). For example, the conductor 111 may be made of a material such as copper, annealed copper, tinned copper, or the like, and may be a solid wire or a stranded wire. Further, when the conductor 111 is broken, the outer diameter may be about 0.5 to 0.6 mm, and in the case of twisted wire, the small wire diameter may be about 0.203 mm.

Meanwhile, the insulator 112 is formed of a resin composition. In the case of a plenum-rated cable requiring high flame resistance, the insulator 112 may be made of polytetrafluoroethylene (PTFE) resin, fluorinated ethylene propylene Halogenated polyolefin resins such as polyvinyl chloride (PVC), flame retardant polyethylene (Fire-resistant Polyethylene) (FRPE), flame retardant polypropylene And fire-resistant polyolefin resin such as fire-resistant polypropylene (FRPP). In addition, the thickness of the insulator 112 may be about 0.5 to 0.61 mm.

Conventionally, a UTP cable has a structure in which a plurality of pairs of units constituting the UTP cable are twisted at a constant pitch, wherein the twist pitch of the plurality of pairs is called an aggregate pitch.

Conventional UTP cables are crosstalk which is adversely influenced by signal attenuation according to the aggregate pitch and noise generated in transmission signals of adjacent pair units due to electromagnetic fields formed by currents flowing in the respective pair units. The phenomenon may occur rapidly in a specific frequency band.

Therefore, unlike the conventional UTP cable, the inventors of the present invention have found that even when all of the plurality of the pair units 100 constituting the UTP cable according to the present invention do not have a twisted structure at a constant pitch, the crosstalk phenomenon The present invention has been completed.

That is, the UTP cable according to the present invention is substantially free of the aggregate pitch, which is the twist pitch of the entire plurality of the pair units 100. Here, the fact that the aggregate pitches of the plurality of the pair units 100 are substantially absent means that a plurality of the conductors 110 are formed in the same manner as in the first embodiment except for the partial or total twist that naturally occurs in the production process such as extrusion and winding. Means that there is no artificially imparted twist throughout the aggregated plurality of the pair units before they are assembled into a pair unit 100 after being twisted at a constant pitch and then assembled into a plurality of the pair units and put into the sheath extruder.

The UTP cable according to the present invention has a structure in which a plurality of wires 110 constituting the plurality of pair units 100 are twisted at a constant pitch so as not to be separated from each other, The pitch is called the pitch.

In addition, signal attenuation and crosstalk may occur in a specific frequency band depending on the pitch. Therefore, it is necessary to precisely adjust the pitch of the pitch to suppress the signal attenuation and the crosstalk phenomenon for each frequency band of use of the UTP cable.

More specifically, in the present invention, the pitch x of the pair unit 100 having the smallest pitch among the plurality of the pair units 100 is 4 mm or more, and the pitch (y, z, w) can satisfy the following condition for each frequency band of UTP cable.

If the UTP cable used frequency is less than 500 MHz,

The pitch ^{(y)> 0.0055x 2 + 0.9933x} + 0.0216

The pitch ^{(z)> 0.0114x 2 + 0.9931x} -0.0023

Pitch (w)> 0.0212x ² + 0.9466x + 0.1253

When the operating frequency of UTP cable is 1,000 MHz or less,

The pitch ^{(y)> 0.0109x 2 + 0.9998x} -0.0165

The pitch ^{(z)> 0.0292x 2 + 0.9325x} + 0.1563

The pitch ^{(w)> 0.0624x 2 + 0.7039x} + 0.8251

When the UTP cable used frequency is 1,500 MHz or less,

The pitch ^{(y)> 0.0224x 2 + 0.9216x} + 0.2455

The pitch ^{(z)> 0.063x 2 + 0.6882x} + 0.88

Pitch (w)> 0.1609x ² -0.1952 + 3.5438

If the UTP cable used frequency is below 2,000 MHz,

The pitch ^{(y)> 0.0242x 2 + 1.0121x} -0.1667

The pitch ^{(z)> 0.0982x 2 + 0.551x} + 0.9266

The pitch ^{(w)> 0.3372x 2 -1.7924x +} 7.7828

A plurality of conductors 111 covered by the insulator 1120 may be used when the pitch x of the pair unit 100 having the smallest pitch pitch among the plurality of the pair units 100 is less than 4 mm, Not only the operability of the bulking process for forming the pair unit by twisting the two conductors 110 at a constant pitch is lowered but also the softening rate and the conductor resistance are increased as the pitch is shortened. When the pitches y, z, and w of the other pair units 100 do not satisfy the above-described conditions for the maximum frequency bands, the electric currents flowing through the respective pair units 100 A crosstalk phenomenon in which noise is generated in a transmission signal of another adjacent pair unit may occur.

On the other hand, the first pair unit 100a and the third pair unit 100c of the plurality of pair units 100 constituting the UTP cable according to the present invention are formed such that the insulator 112 thereof is a resin composition containing a low- And the second pair unit 100b and the fourth pair unit 100d may be formed from a resin composition including the polyvinyl chloride resin and the first pair unit 100a (X), the second pair unit (100b) has a pitch (z), the third pair unit (100c) has a pitch (y), and the fourth pair unit May have a pitch (w).

On the other hand, all of the insulators 112 of the plurality of pair units 100 constituting the UTP cable according to the present invention can be formed from a resin composition containing a low-density polyethylene resin, and the first pair unit 100a has a pitch (x) and the second pair unit 100b has a pitch y or a pitch z and the third pair unit 100c has a pitch P y and the fourth pair unit 100d has a larger pitch w and a larger pitch z when the second pair unit 100b has a larger pitch z, ).

The UTP cable according to the present invention can suppress the signal attenuation and the crosstalk phenomenon in a specific frequency band caused by the aggregate pitch because there is substantially no aggregate pitch of the entire plurality of the pair units 100, Precisely controlling the pitch of each of the pair units 100 as described above provides an excellent effect of effectively suppressing or minimizing the crosstalk phenomenon of signal transmission at the same time.

In the present invention, the sheath 400 has a function of protecting the plurality of the pair units 100 from external pressure or impact and shielding external interference caused by electromagnetic waves generated from adjacent cables or other electronic equipment .

The material of the sheath 400 is not particularly limited, but may preferably be formed from a resin composition containing flame retardant polyvinyl chloride (PVC) or a flame-retardant polyolefin-based resin. The flame retardancy of the flame retardant polyvinyl chloride (PVC) may be limited oxygen index (LOI) of 48 to 65%. The thickness of the sheath 400 may vary depending on the material forming the insulator 112 of the pair unit 100, and may be, for example, 0.3 to 0.55 mm.

In the present invention, in order to more reliably suppress the separation of the plurality of leads 110 constituting the pair unit 100 from each other to prevent the impedance from being changed, the pair unit 100 includes the plurality of leads 110, May be further included. The material of the individual sheath 120 is not particularly limited and may be the same as or different from the material of the sheath 400.

In the present invention, the UTP cable according to the present invention may further include a filler 200 to suppress or minimize the crosstalk phenomenon. The pillar 200 further includes a plurality of barrier ribs that physically separate the plurality of the pair units 100 from each other, thereby further suppressing or minimizing crosstalk between the plurality of pair units 100, It is possible to stably maintain the arrangement of the UTP cable 100 to improve the structural stability of the UTP cable.

The material of the plurality of partitions constituting the filler 200 is not particularly limited and may be made of the same material as or different from that of the insulator 112. 3, each of the partition walls constituting the pillars 200 may be attached to the inner wall of the sheath 400 or an outer shielding layer 300 described later or may be separated from the inner wall by a predetermined distance have.

In the filler 200, the thicknesses of the respective partition walls constituting the filler 200 may be substantially the same. Thus, the UTP cable according to the present invention easily maintains the roundness of its cross section, thereby effectively suppressing the deterioration of the data transmission performance due to the partial twist of the cable when the UTP cable is used or wrapped around the bobbin, Exhibit excellent effect. For example, the total thickness of the plurality of partitions constituting the filler 200 may be 0.6 to 1 mm and the length may be 4.5 to 5 mm.

The UTP cable according to the present invention may further include an external shielding layer 300 between the plurality of pair units 100 and the sheath 400. The external shield layer 300 prevents signal interference between adjacent cables and further enhances the flame retardancy of the UTP cable. The external shield layer 300 may be formed of a metal tape, a metal piece, or the like.

The UTP cable according to the present invention may further include a lip code 500 in the sheath 400. [ The rib cords 500 are used to facilitate the outer jacket 300 and are made of Kevlar aramid yarn, fiber glass epoxy rod, fiber reinforced polyethylene (FRP) Polyethylene, high strength fiber, galvanized steel wire, and steel wire, the function as a tensile wire for imparting a tensile strength to the UTP cable can be performed in parallel.

[Example]

1. Manufacturing Example

UTP cable specimens were manufactured to the specifications shown in Table 1 below.

UTP cable specimen Conductor: copper conductor (diameter 0.57 mm)
Aggregation of multiple pairs of units Pitch: none
Insulator Outer diameter: 1.10 to 1.11 mm
Individual sheath and outer sheath: Flame retardant polyvinyl chloride Insulation material Pitch The first pair unit Low density polyethylene 7.5 to 8 mm The second pair unit Polyvinyl chloride 14 to 14.5 mm The third pair unit Low density polyethylene 10 to 10.5 mm The fourth pair unit Polyvinyl chloride 23 to 23.5 mm

2. NEXT (near end crosstalk) evaluation

Near end crosstalk (NEXT) was measured with a single-eneded measurement method using a network analyzer (product name: Agilent 5071C) and a measurement kit (product name: ANSI / TIA-1183).

FIG. 4 shows a result of NEXT (near end crosstalk) evaluation for a UTP cable specimen. As shown in FIG. 4, it has been confirmed that the UTP cable according to the present invention has substantially no aggregate pitch, so that sharp crosstalk between the pair units does not cause a phenomenon and exhibits good signal transmission characteristics.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. You can do it. It is therefore to be understood that the modified embodiments are included in the technical scope of the present invention if they basically include elements of the claims of the present invention.

100: Pair unit 200: Filler
300: outer shielding layer 400: sheath
500: lip code

Claims (12)

A pair of four pairs of wires formed by twisting a plurality of wires including a conductor and an insulator surrounding the conductor, and a sheath surrounding the whole of the four pair units,
The UTP cable is substantially free of aggregate pitches, which are the twist pitches of all four pairs of units. The method according to claim 1,
(X) of the pair unit having the shortest pitch, which is the twist pitch of the plurality of wires constituting each of the four pairs of units, is not less than 4 mm, and the pitches y , w) is a UTP cable that satisfies the following conditions.
When the frequency of use of the UTP cable is 500 MHz or less,
The pitch ^{(y)> 0.0055x 2 + 0.9933x} + 0.0216
The pitch ^{(z)> 0.0114x 2 + 0.9931x} -0.0023
Pitch (w)> 0.0212x ² + 0.9466x + 0.1253
When the frequency of use of the UTP cable is 1,000 MHz or less,
The pitch ^{(y)> 0.0109x 2 + 0.9998x} -0.0165
The pitch ^{(z)> 0.0292x 2 + 0.9325x} + 0.1563
The pitch ^{(w)> 0.0624x 2 + 0.7039x} + 0.8251
When the frequency of use of the UTP cable is 1,500 MHz or less,
The pitch ^{(y)> 0.0224x 2 + 0.9216x} + 0.2455
The pitch ^{(z)> 0.063x 2 + 0.6882x} + 0.88
Pitch (w)> 0.1609x ² -0.1952 + 3.5438
When the frequency of use of the UTP cable is 2,000 MHz or less,
The pitch ^{(y)> 0.0242x 2 + 1.0121x} -0.1667
The pitch ^{(z)> 0.0982x 2 + 0.551x} + 0.9266
The pitch ^{(w)> 0.3372x 2 -1.7924x +} 7.7828 3. The method according to claim 1 or 2,
Wherein the four pair units include an individual sheath surrounding the plurality of conductors constituting the UTP cable. 3. The method of claim 2,
Wherein the first pair unit and the third pair unit are formed from a resin composition containing a low-density polyethylene resin, and the first pair unit and the third pair unit are formed of a resin composition containing a low-density polyethylene resin, Wherein the second pair unit and the fourth pair unit are formed from a resin composition containing polyvinyl chloride resin, the first pair unit having the pitch (x), and the second pair unit having the pitch (z), said third pair unit has said pitch (y), and said fourth pair unit has said pitch (w). 3. The method of claim 2,
The four pairs of units include first through fourth pair units sequentially arranged in a clockwise direction, and the insulators of the first through fourth pair units may be formed from a resin composition containing a low density polyethylene resin, Wherein the first pair unit has a pitch y and the second pair unit has the pitch y or the pitch z and the second pair unit has the pitch y , The third pair unit has the pitch (z), and the third pair unit has the pitch (y) when the second pair unit has the pitch (z) Wherein the unit has the above pitch (w). The method of claim 3,
Wherein the individual sheath is made of a flame retardant polyvinyl chloride resin or a flame retardant polyolefin resin. 3. The method according to claim 1 or 2,
Further comprising a filler including at least one partition wall for separating each of the first to fourth pair units from each other. 8. The method of claim 7,
And the thickness of the plurality of partition walls is 0.6 to 1 mm. 3. The method according to claim 1 or 2,
Further comprising an outer shield layer disposed between the pair unit and the sheath. 3. The method according to claim 1 or 2,
Further comprising a lip cord inside said sheath. 3. The method according to claim 1 or 2,
The conductor is a single wire or twisted wire of copper, interlocking or tin plating,
Wherein the insulator is made of a flame retardant polyolefin resin, a fluororesin or a halogenated polyolefin resin,
Wherein the sheath is made of a flame retardant polyvinyl chloride resin or a flame retardant polyolefin resin. 12. The method of claim 11,
The thickness of the insulator is 0.5 to 0.61 mm,
Wherein the sheath has a thickness of 0.3 to 0.55 mm.

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