KR20040045672A - IDC Patch Cord with Crosstalk Canceling Mechanism - Google Patents

Abstract

PURPOSE: An IDC(Insulation Displacement Contacts) patch cord having a crosstalking eraser is provided to eliminate most of capacitive crosstalk generated from a connection pin and enable high-speed signal transmission. CONSTITUTION: An IDC type patch cord includes a plug body(20), a plug cover(30), a plurality of connection pins(40), and a cable(50). The plug body has a plurality of first combining protrusions(22) and a plurality of second combining holes(24). The plug body further includes a plurality of pin holes(26) arranged at a predetermined interval. The plug cover has a plurality of first combining holes(32) and a plurality of second combining protrusions(34), which are respectively combined with the first combining protrusions and the second combining holes of the plug body. The connection pins includes cross pairs(42) and straight pairs(44) alternately arranged. One end of each of the cross pairs is inserted into a corresponding pin hole of the plug body. Cores(52) of the cable are connected to the connection pins.

Description

IDC patch cord with crosstalk canceling means {IDC Patch Cord with Crosstalk Canceling Mechanism}

The present invention relates to an IDC type patch cord having crosstalk erasing means, and more particularly, a pair of straight pin pairs not intersected with a pair of parallel lines intersected in the same pair and alternately arranged, and a high speed by means of a compensation plate. An IDC type patch cord having crosstalk clearing means adapted to completely cancel capacitive crosstalk caused by an arrangement of contact pin plates of an IDC plug required for communication.

Conventional Insulation Displacement Contacts (IDC) patch cords for connecting blocks have problems in high-speed data transmission due to crosstalk between signal pairs. This means that multiple signal pairs of cables terminated by plugs (e.g. 4 pairs in the case of UTP cables) are inserted into IDC patch cord plugs side by side with the pins uncoupled by connecting with the connection pins, resulting in unevenness between the conductors of the pair. This is because crosstalk is seriously caused by electromagnetic coupling.

Therefore, the standard of ISO / IEC 11801 standardizes connection materials in category 5 and category 6, and specifies that minimum near-end crosstalk satisfies 40 kHz or more at 100 MHz.

Generally, an IDC patch cord is composed of a plug 10, a connecting pin 4, and a cable 6, as shown in FIG.

The plug 10 is composed of a body 12 and the cover 16, the body 12 is formed with four first coupling protrusions 13 protruding to the inner surface, the cover 16 is the first The first coupling groove 17 to which the coupling protrusion 13 is fastened and coupled is formed at a corresponding position. In addition, the cover 16 has four second coupling protrusions 18 arranged in a row at opposite corners of the first coupling groove 17 to protrude to the inner surface at predetermined intervals, and the body ( 12, the second coupling groove 14 to which the second coupling protrusion 18 is coupled is formed at a position corresponding thereto.

As described above, the first coupling protrusion 13 of the body 12 is fastened and coupled to the first coupling groove 17 of the cover 16, and the second coupling protrusion 18 of the cover 16 is the body 12. The box body 12 and the cover 16 is fixed by being coupled to the second coupling groove 14 of the.

The body 12 has a pin groove 15 in which the connecting pin 4 is inserted and supported by a number corresponding to the number of the connecting pins 4.

A plurality of core wires 7 are embedded in the cable 6 in a twisted state, and one end portion of the core wires 7 is arranged and connected to each of the connecting pins 4 one by one.

Insert the connecting pin 4 into the pin groove 15 of the body 12 in the state in which the core wire 7 of the cable 6 is connected to the connecting pin 4, and the cover 16 is inserted. It is completed by fixing to the body 12.

3 shows an IDC patch cord provided with plugs 10 at both ends of the cable 6. The IDC type patch cord manufactured as described above is used to electrically connect or distribute the connecting blocks.

In the conventional IDC patch cord configured as described above, a differential mode signal crosstalk occurs in the plug 10. As a cause, as shown in FIG. 1, the cable is inserted into the connector from the outer cover of the cable 6. Differential signal crosstalk caused by unwinding the core 7 between pairs and pulling them in side by side, and the differential signal inserted by the connecting pins 4 arranged in parallel with each other as shown in FIG. ) Can be divided into capacitive crosstalk generated by the capacitance difference between neighboring conductors.

It is an object of the present invention to provide an IDC type patch cord having a crosstalk canceling means capable of transmitting a very high speed signal by canceling most of the capacitive crosstalk generated by the connection pin 4.

BRIEF DESCRIPTION OF THE DRAWINGS The top view of the state which opened the cover which shows the plug part of the conventional IDC type patch cord.

2 is a perspective view of an IDC type patch cord.

3 is a plan view schematically showing a connection pin arrangement of a conventional IDC patch cord.

Figure 4 is an exploded perspective view showing an embodiment of an IDC type patch cord having crosstalk erasing means according to the present invention.

Figure 5 is a perspective view showing the connection pin of the cross pair in one embodiment of the IDC type patch cord having crosstalk erasing means according to the present invention.

Figure 6 is a perspective view showing the connection pin of the straight pair in one embodiment of the IDC type patch cord having crosstalk erasing means according to the present invention.

Fig. 7 is a side cross-sectional view showing a state in which a core wire is connected to the core wire connecting portion in one embodiment of an IDC type patch cord having crosstalk erasing means according to the present invention;

Figure 8 is a plan view showing the modeling of the arrangement of the connection pin in the embodiment of the IDC type patch cord having crosstalk erasing means according to the present invention.

FIG. 9 is a circuit diagram modeled to explain a process of canceling crosstalk between a cross pair and a straight pair in an embodiment of an IDC type patch cord having crosstalk canceling means according to the present invention; FIG.

10 is a graph showing near-end crosstalk measurement of an IDC patch cord having a crosstalk canceling means according to the present invention and a conventional IDC patch cord;

IDC type patch cord having a crosstalk erasing means proposed by the present invention is formed with a plurality of first coupling protrusions and second coupling grooves and a plurality of pin grooves are formed at predetermined intervals on the opposite edge where the first coupling protrusions are formed. A plug cover having a plug body, a first coupling groove to which the first coupling protrusion of the plug body is coupled, and a second coupling protrusion to be coupled to the second coupling groove, and a pin groove of the plug body. It includes a plurality of connecting pins alternately arranged in the cross-pair and the straight pair that does not intersect with the insertion end is fixed and intersected, and the cable to which the core wire is connected and fixed to the connection pin, respectively.

In the above, two connection pins each constitute a pair (pair), and constitute an electrical circuit with at least two pairs.

At the opposite end of the connecting pin inserted into the pin groove, a core wire connecting portion having a core wire fixing groove having a substantially "Ｖ" shape in which the core end of the cable is inserted and connected is installed.

The core wire fixing groove is preferably formed to be inclined to be smaller than the conductor diameter of the core wire so as to be connected to the conductor while tearing the outer skin of the core wire as the core wire is inserted.

Each of the connection pins is provided with a compensation plate each having a larger area than the other part to eliminate capacitive crosstalk.

Next, a preferred embodiment of an IDC type patch cord having crosstalk erasing means according to the present invention will be described in detail with reference to the drawings.

First, an embodiment of the IDC type patch cord having crosstalk erasing means according to the present invention, as shown in Figure 4, a plurality of first coupling protrusion 22 and the second coupling groove 24 is formed and the first On the opposite edge where the engaging projection 22 is formed, a plurality of the plug body 20, the plurality of pin grooves 26 are formed at predetermined intervals, and the first coupling protrusion 22 of the plug body 20 is fastened. A plug cover 30 having a plurality of second coupling protrusions 34 fastened to the first coupling groove 32 and the second coupling groove 24, and the pin groove of the plug body 20. A plurality of connecting pins 40 alternately arranging a cross pair 42 in which one end portion is inserted into and fixed to the cross section 26 and a straight pair 44 that does not cross, and the connecting pin 40 described above. ), And each of the core wires 52 is connected to each other.

The plug body 20 and the plug cover 30 have the inlet grooves 28 and 38 for the cable 50 to be inserted therein, and a seating portion for fixing the position of the cable 50. 29) and 39, respectively. Preferably, the seating portions 29 and 39 are configured as protrusions having elasticity to support and fix the cable 50 to be installed.

The first coupling protrusion 22 and the second coupling protrusion 34 are formed in the first coupling groove 32 and the second coupling groove 24 by protruding an end portion toward the outer circumferential surface to form a locking jaw. Each fastened state is configured to remain firm. In other words, the first coupling protrusion 22 and the second coupling protrusion 34 are engaged with the first coupling groove 32 and the second coupling groove 24, respectively, in a state where the locking jaw is caught by its elastic force. It is configured so that the coupling state is not easily separated.

In the above, the first coupling protrusion 22, the second coupling protrusion 34, the first coupling groove 32 and the second coupling groove 24 are formed in the plug body 20 and the plug cover 30, respectively. As described above, the present invention is not limited thereto, and only one pair of the first coupling protrusion 22 and the first coupling groove 32 or the second coupling protrusion 34 and the second coupling groove 24 is formed. It is possible to apply the other structure as long as it is possible to detachably fasten the plug body 20 and the plug cover 30.

In the above, two connection pins 40 each constitute a pair (pair), and constitute an electrical circuit of at least two pairs.

In the present embodiment, the eight connection pins 40 are configured in four sets, and the pair of cross pairs 42 and the pair of straight pairs 44 are configured.

The connecting pins 40 are alternately replaced in the same manner as one set of cross pairs 42, one set of straight pairs 44, one set of cross pairs 42, and another set of straight pairs 44 sequentially from one side. Arrange and install it.

As shown in FIG. 5, the connecting pin 40 constituting the cross pair 42 includes a contact part 45 inserted into the pin groove 26 of the plug body 20 and the contact part 45 from the contact part 45. A straight portion 46 extending to one side, an intersection portion 47 formed by bending in an arc shape corresponding to each other extending from the straight portion 46 and intersecting with each other, and the crossing portion 47 are connected to each other. And a core wire connecting portion 48 to which the core wire 52 of the cable 50 is connected.

The intersection portion 47 is formed in a high position, one intersection portion 47 is formed in a high position, and the other intersection portion 47 in a low position so that a short circuit does not occur when one pair is installed cross each other Form. For example, as shown in FIG. 5, the crossing part 47 of the connection pin 40 located on the left side is formed low, and the crossing part 47 of the connection pin 40 located on the right side is formed high.

The crossing portion 47 is not limited to an arc shape alone, and a structure capable of intersecting a pair of connecting pins 40 can be formed in various shapes such as a triangle, an elliptical half, and a hexagonal half. .

The connecting pin 40 constituting the straight pair 44 is one of the contact portion 45 inserted into the pin groove 26 of the plug body 20 and one of the contact portions 45 as shown in FIG. 6. It consists of a straight line 46 extending to the wire and the core wire connecting portion 48 is connected to the straight line 46, the core wire 52 of the cable 50 is connected.

The portion adjacent to the core wire connecting portion 48 of the straight pair 44 may be formed at a predetermined inclination in order to increase the efficiency of the installation space. In this case, the inclination angles formed on the connection pins 40 of the straight pairs 44 are set to be the same, and the straight pairs 44 are configured such that the pair of connecting pins 40 are kept parallel in all the sections.

Each of the connection pins 40 is provided with a compensating plate 43 formed of a larger area than the other portions in order to eliminate capacitive crosstalk.

The compensating plate 43 is installed in the middle of the cross section 47 in the case of the cross pair 42, and is installed in the portion close to the core connection part 48 in the case of the straight pair 44.

The compensation plate 43 installed in the straight pair 44 is installed at positions corresponding to the compensation plates 43 installed in the cross pair 42, respectively. That is, the compensation plate 43 installed in the cross pair 42 and the compensation plate 43 installed in the straight pair 44 are configured to be in a straight line.

The core end connecting portion 48, which is the opposite end inserted into the pin groove 26 of the connecting pin 40, has an approximately "Ｖ" shape in which the end of the core wire 52 of the cable 50 is inserted and fixed. The core wire fixing groove 49 is formed.

As shown in FIG. 7, the core wire fixing groove 49 is connected to the conductor 54 while tearing the sheath 53 of the core wire 52 as the core wire 52 is inserted. It is formed with an inclination equal to or smaller than the diameter of the conductor 54 of the core wire 52.

Furthermore, if both sides of the core wire fixing groove 49 are formed in an inclined surface that is sharp and widens downward, the outer shell 53 of the core wire 52 is torn out better.

Therefore, the core 52 is forcibly inserted into the core fixing groove 49 without any separate work of removing the outer shell 53 of the core 52, and thus, between the conductor 54 and the core connecting portion 48. The electrical connection is made, so the connection work does not require any equipment or equipment and is very simple to complete.

Next, a process and principle of capacitive crosstalk erasing in one embodiment of an IDC type patch cord having crosstalk canceling means according to the present invention configured as described above will be described.

In general, when the connecting pins 4 are parallel as shown in FIG. 3, the differential signal, which is introduced into the connecting pin 4 from the outside and transmitted to the cable 6, is the capacitance according to the capacitance difference in the adjacent neighboring conductors (connection pins). It is known to cause sexual crosstalk.

In order to completely eliminate the capacitive crosstalk generated as described above, a potential difference should not occur between T3 and R3, which are the connecting pins 40 of the cross pair 42, in the modeling sections of FIGS. In order to do this, the sum of all capacitances corresponding to T3 and the sum of all capacitances induced in R3 are equal.

Herein, if T2, which is the connecting pin 40 of the cross pair 42 and the neighboring straight pair 44, is a positive signal, the capacitance induced by the cross pair 42 T3 and R3 is (-). Is displayed.

If this is expressed as an equation, the following Equation 1 is obtained.

In the above, C _T2T3 represents the capacitance between T2 and T3 at the contact portion 45 and the straight portion 46, _which is the crosstalk generating portion, and C _T2R3 represents the capacitance between T2 and T3 at the contact portion 45 and the straight portion 46, _which is the crosstalk generating portion. _Represents the capacitance between R3, C _R2T3 represents the capacitance between R2 and T3 at the contact portion 45 and the straight portion 46, and C _R2R3 represents the capacitance between the contact portion 45 and the straight portion (the crosstalk generation portion). 46 denotes the capacitance between R2 and R3, C ' _T2T3 denotes the capacitance between T2 and T3 at the compensating plate 43, and C' _T2R3 denotes the compensating plate 43 as the eraser. _Denotes the capacitance between T2 and R3 at _C'R2T3 denotes the capacitance between R2 and T3 at the compensation plate 43 which is the eraser, and C ' _R2R3 at the compensation plate 43 that is the eraser. The capacitance between R2 and R3 is shown.

That is, in the contact portion 45 and the straight portion 46, the crosstalk generating portion, T3 is more capacitively coupled than R3. However, in the compensating plate 43, the erasing portion, R3 is more capacitive than T3. Is done. Therefore, if the amount of crosstalk introduced into the two leads is the same, crosstalk is eliminated in the differential mode signal.

The generation of capacitive crosstalk as described above will be described with reference to FIGS. 5, 6 and 8 as follows.

First, consider the capacitance that provides the cause of capacitive crosstalk to T3 and R3 on three lines by the differential signal introduced into two lines T2 (+) and R2 (-). The capacitive capacitance induced by T3 is determined by T2. It can be represented by the sum of the C _R2T3 generated by the generated C _T2T3 and R2, the capacitive capacitance induced in R3 may be represented by the sum of C C _R2R3 generated by _T2R3 and R2 generated by the T2. That is, crosstalk occurs in T3 and R3 due to the capacitance difference by (-C _T2T3 + C _R2T3 )-(-C _T2R3 + C _R2R3 ). Since the area and the spacing of the contact portion 42 and the straight portion 46, which are the crosstalk generating portions, are the same, C _T2T3 = C _R2R3 . Therefore, the capacitance affecting crosstalk can be _expressed as C _T2R3 -2C _T2T3 -C _T2R3 , which can be expressed as Equation 2 below.

In the above, e denotes the dielectric constant between the connecting pins 40, d denotes the distance (interval) between the connecting pins 40, t denotes the thickness of the connecting pins 40, and A denotes a contact portion that is a crosstalk cancellation unit. Areas of the 45 and the straight portion 46 are shown.

When the thickness t of the connection pin 40 is sufficiently small as compared with the interval d between the connection pins 40 (that is, if t << d), the above Equation 2 is expressed by Equation 3 below. Can be represented.

The crossing pairs 42 cross each other as shown in FIGS. 4 and 8 while passing through the intersection portion 47. When the cross section 47 passes as shown in FIG. 8, the crosstalk is canceled by the compensation plate 43. When the process of crosstalk is canceled as described above, the capacitance with T3 is represented by C ' _R2T3- C' _T2T3 , and the capacitance with R3 is represented by C ' _R2R3- C' _T2R3 . In the compensating plate 43, which is an eraser, the distance dc between the compensating plates 43 is sufficiently reduced in order to apply a stronger capacitance coupling to the neighboring conductor (connection pin 40).

Therefore, when only the capacitance generated in the compensating plate 43, which is the _erase unit, is calculated, it is expressed as (C ' _R2T3 -C' _T2T3 )-(C ' _R2R3 -C' _T2R3 ).

If this is expressed as Equation 2, Equation 4 below is obtained.

In the above, B represents the area of the compensation plate 43, da represents the distance (interval) between the compensation plate 43 of the cross pair 42, dc is the compensation plate 43 of the cross pair 42 and The distance (interval) between the compensation plates 43 of neighboring straight pairs 44 is shown.

In FIG. 8, it can be seen that 3d = da + 2dc from the interval between R2 and T4, and from this, da = 3d-2dc. Substituting this in Equation 4, the following Equation 5 can be obtained. .

Compared to the spacing d between the connecting pin 40 and the spacing dc between the compensating plate 43 of the cross pair 42 and the compensating plate 43 of the neighboring straight pair 44, the connecting pin ( If the thickness t of 40) is sufficiently small (that is, if t &lt; d and t &lt; dc), the above expression (5) can be expressed as shown in the following equation (6).

In the above Equation 6, the distance d between the connecting pin 40 is the distance dc between the compensation plate 43 of the cross pair 42 and the compensation plate 43 of the neighboring straight pair 44. ), I.e., d = dc, as shown in Equation 7 below.

Comparing Equations 7 and 3 above, it can be seen that capacitive crosstalk is completely canceled when signs are opposite to each other and have the same magnitude. Therefore, assuming that d = dc, it can be seen that capacitive crosstalk is completely erased exactly when the area A of the crosstalk generating portion and the area B of the erasing portion coincide.

Therefore, the distance (d) between the compensation plate 43, which is an eraser capable of erasing crosstalk, and the distance (d) between the connecting pin 40, and the area A of the crosstalk generating portion from Equations 6 and 3 above. The relationship between the area B of the compensating plate 43, which is an eraser, can be expressed by Equation 8 below.

Since the distance d between the connecting pins 40 is the pitch between the IDC pins of the connecting block, the distance d can be viewed as a constant, and the area A of the contact portion 45 and the straight portion 46, which is the crosstalk generating portion, is also designed. This is the value determined. Therefore, the relationship between the area B of the compensation plate 43, which is the eraser, and the distance dc between the compensation plate 43, can be obtained from Equation 8 described above.

When it is difficult to design the area B of the compensation plate 43 sufficient to eliminate capacitive crosstalk from the above Equation 8, the straight pair 44 adjacent to the compensation plate 43 of the cross pair 42 is difficult to design. It can be seen that it is possible to sufficiently cancel capacitive crosstalk by reducing the distance dc between the compensation plates 43.

Near-end crosstalk measured by applying the result of Equation 8 to one embodiment of an IDC-type patch cord having crosstalk canceling means according to the present invention, and near-end crosstalk of a conventional IDC type patch cord as shown in FIGS. The results of the measurement are shown graphically in FIG. 10.

As can be seen from Figure 10, in the case of the IDC type patch cord having crosstalk canceling means according to the present invention, it can be confirmed that near-end crosstalk characteristic is improved by at least 15 dB compared with the conventional IDC type patch cord.

In the above, a preferred embodiment of an IDC patch cord having crosstalk erasing means according to the present invention has been described, but the present invention is not limited thereto, and various modifications are made within the scope of the claims and the detailed description of the invention and the accompanying drawings. It is possible to implement, and this also belongs to the scope of the present invention.

According to the IDC type patch cord having crosstalk canceling means according to the present invention as described above, most of the capacitive crosstalk occurring in the contact portion and the straight portion of the connecting pin alternately by arranging the cross pair and the straight pair alternately. It is possible to erase completely in the first place by installing the compensation plate at each of the connecting pins. Thus, high speed communication is possible.

In addition, according to the IDC type patch cord having crosstalk erasing means according to the present invention, the conductor is connected to the connecting pin while the outer skin of the core is torn by forcibly inserting the core of the cable into the core connecting portion of the connecting pin. The work does not require any equipment or tools and is very easy.

Claims (10)

A plug body having a plurality of first coupling protrusions and second coupling grooves formed thereon, and a plurality of pin grooves formed at predetermined intervals on opposite edges of the first coupling protrusions; A plug cover having a plurality of first coupling grooves to which the first coupling protrusions of the plug body are coupled, and a plurality of second coupling protrusions to be coupled to the second coupling grooves; A plurality of connection pins alternately arranging a cross pair having one end inserted into and fixed to the pin groove of the plug body, and a straight pair having no intersection; An IDC patch cord having crosstalk erasing means including a cable to which a core wire is connected and fixed to each of the connecting pins. The method of claim 1, An IDC patch cord having crosstalk erasing means, each of which is provided with a compensation plate having a larger area than the other portion in order to cancel capacitive crosstalk. The method of claim 1, Each of the two connection pins constitutes a pair (pair), IDC type patch cord having a crosstalk erasing means that constitutes an electrical circuit of at least two sets. The method according to any one of claims 1 to 3, The connecting pins forming the cross pair are bent into a contact portion inserted into the pin groove of the plug body, a straight portion extending to one side from the contact portion, and an arc shape corresponding to each other extending from the straight portion and crossing each other. And a core wire connecting portion which is formed to be connected to the crossing portion and is connected to the crossing portion to which the core wire of the cable is connected. The connecting pins forming the straight pair are connected to the contact portion inserted into the pin groove of the plug body, a straight portion extending to one side from the contact portion, and connected to the straight portion, and the core wire of the cable is connected. An IDC type patch cord having crosstalk erasing means composed of a core wire connecting portion. The method of claim 4, wherein The cross section is an IDC patch cord having crosstalk erasing means for forming one cross section at a high position and the other cross section at a low position so that a short circuit does not occur when one set crosses each other. The method of claim 4, wherein the compensation plate is In the case of the above-mentioned cross pair, it is installed in the middle of the cross section, In the case of the above-mentioned straight pair, an IDC type patch cord having crosstalk erasing means provided in a portion close to the core wire connecting portion. The method of claim 4, wherein The distance (dc) between the compensation plate of the cross pair and the compensation plate of the neighboring straight pair, the distance (d) between the connecting pins, the area (A) of the contact portion and the straight portion, which are crosstalk generating portions, and the area of the compensation plate, which is the eraser, The relationship between (B) is an IDC type patch cord having crosstalk canceling means that satisfies the following expression (9). Where e denotes the dielectric constant between the connecting pins, d denotes the distance (interval) between the connecting pins, dc denotes the distance (interval) between the compensation plate of the crossing pair and the compensation plate of the neighboring straight pair, and A Denotes the area of the contact portion and the linear portion, which is the crosstalk generation portion, and B denotes the area of the compensation plate, which is the erase portion. The method of claim 4, wherein IDC-type patch cord having crosstalk erasing means for forming a "Ｖ" -shaped core wire fixing groove to which the core wire end of the cable is inserted and connected to the core wire connecting portion, which is the opposite end inserted into the pin groove of the connecting pin. The method of claim 8, The core wire fixing groove has an IDC-type patch cord having crosstalk erasing means formed to be equal to or smaller than the conductor diameter of the core wire so as to be connected to the conductor while tearing the outer skin of the core wire as the core wire is inserted. The method of claim 1, The plug body and the plug cover have IDC-type patch cords having crosstalk erasing means for respectively forming an inlet groove for entering the cable and a seating portion for fixing the position of the cable.