Standard circuit and standard for CAT 6A far-end crosstalk

Abstract

The application provides a standardizer circuit applied to CAT 6A far-end crosstalk, which avoids the parasitic crosstalk in the prior art and improves the performance of the standardizer circuit by disconnecting all the paths irrelevant to the far-end crosstalk test and connecting a series matching load. The application also provides a standardizer applied to CAT 6A far-end crosstalk and adopting the standardizer circuit.

Description

Technical Field

[0001] This invention relates to the field of cable analyzers, and more particularly to a standard circuit, standard, and calibrator for use with CAT 6A remote crosstalk. Background Technology

[0002] A cable analyzer is a primary instrument used to measure the physical layer parameters of a local area network (LAN) and the quality of network cabling. It is essential for early-stage network cabling installation, troubleshooting, and network maintenance. It is a necessary analytical instrument for certifying cabling systems and ensuring that their connectivity and transmission performance meet local, national, or international standards. Since half of network failures occur due to failures to meet requirements during the cabling phase, a cable analyzer is an indispensable testing tool.

[0003] Figure 1 This is a standard circuit diagram for remote crosstalk in existing technology. Figure 1 In JJF 1494 (Network Cable Analyzer Calibration Specification), a design method for a remote crosstalk standard circuit diagram is provided. However, experiments show that the measurement results fluctuate greatly in the high-frequency band (250MHz-500MHz). Analysis revealed that the reason is that the wiring on the PCB board connects all wire pairs, which easily causes parasitic crosstalk between wire pairs. Moreover, this parasitic crosstalk is uncontrollable and more pronounced in the high-frequency band. This design reduces the reliability and controllability of the standard, thereby affecting the performance of the device. Summary of the Invention

[0004] This invention aims to at least partially solve one of the aforementioned technical problems or at least provide a useful commercial solution. To this end, one object of the invention is to provide a standard circuit for CAT 6A far-end crosstalk, which improves the performance of the standard circuit by disconnecting all paths unrelated to far-end crosstalk testing and using a series matched load, thereby avoiding parasitic crosstalk in the prior art. Another object of the invention is to provide a standard for CAT 6A far-end crosstalk.

[0005] According to the present invention, a standard circuit for CAT 6A far-end crosstalk is provided, the standard circuit including a first network connector, the first network connector including a first transmit signal pair and a first receive signal pair; a second network connector connected to the first network connector, the second network connector including a second transmit signal pair and a second receive signal pair, wherein the second transmit signal pair is connected to the first transmit signal pair, and a first load is connected in series between the second receive signal pairs, wherein, except for the first transmit signal pair, the other signal pairs of the first network connector are not directly connected to the signal pairs of the second network connector.

[0006] According to the present invention, the standard circuit for CAT 6A far-end crosstalk is improved by disconnecting all paths unrelated to far-end crosstalk testing and connecting a series matched load, thereby avoiding parasitic crosstalk in the prior art.

[0007] In addition, the standard circuit for far-end crosstalk of CAT 6A according to the present invention may also have the following additional technical features:

[0008] The first network connector further includes a first backup signal pair and a second backup signal pair, and the second network connector further includes a third backup signal pair and a fourth backup signal pair, wherein a second load is connected in series between the third backup signal pairs and a third load is connected in series between the fourth backup signal pairs.

[0009] The first transmit signal pair includes a first transmit positive signal pin and a first transmit negative signal pin; the first receive signal pair includes a first receive positive signal pin and a first receive negative signal pin; the first backup signal pair includes a first backup signal pin and a second backup signal pin; and the second backup signal pair includes a third backup signal pin and a fourth backup signal pin.

[0010] Specifically, a first capacitor is connected in series between the first transmit positive signal pin and the first receive positive signal pin, a second capacitor is connected in series between the first transmit positive signal pin and the second backup signal pin, and a third capacitor is connected in series between the first transmit positive signal pin and the third backup signal pin.

[0011] The second transmit signal pair includes a second transmit positive signal pin and a second transmit negative signal pin, wherein the second transmit positive signal pin is connected to the first transmit positive signal pin, the second transmit negative signal pin is connected to the first transmit negative signal pin, a fourth capacitor is connected in series between the second transmit negative signal pin and the fourth spare signal pin, and a sixth capacitor is connected in series between the second transmit negative signal pin and the first spare signal pin.

[0012] The second receive signal pair includes a second receive positive signal pin and a second receive negative signal pin; the third backup signal pair includes a fifth backup signal pin and a sixth backup signal pin; the fourth backup signal pair includes a seventh backup signal pin and an eighth backup signal pin; a fifth capacitor is connected in series between the second transmit negative signal pin and the second receive negative signal pin.

[0013] One end of the first load is connected to the second positive signal receiving pin, and the other end of the first load is connected to the second negative signal receiving pin;

[0014] One end of the second load is connected to the fifth backup signal pin, and the other end of the second load is connected to the sixth backup signal pin;

[0015] One end of the third load is connected to the seventh spare signal pin, and the other end of the third load is connected to the eighth spare signal pin.

[0016] The first load, the second load, and the third load each include a resistor, and the resistance values ​​of the first load, the second load, and the third load are equal.

[0017] The first network connector and the second network connector include RJ45.

[0018] The present invention also provides a standard for CAT 6A far-end crosstalk, comprising: a motherboard; a standard circuit of any structure described above, wherein the standard circuit is fixedly mounted on the motherboard.

[0019] Furthermore, the standard applied to CAT 6A remote crosstalk also includes: a first cross line and a second cross line, wherein the first cross line and the second cross line are respectively connected to the standard circuit.

[0020] According to the present invention, a standard for CAT 6A far-end crosstalk is provided. The standard includes a standard circuit. The standard improves the performance of the standard by disconnecting all paths unrelated to far-end crosstalk testing and connecting a series matched load, thereby avoiding parasitic crosstalk in the prior art. Attached Figure Description

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 This is a circuit diagram of a standard for far-end crosstalk in existing technology;

[0023] Figure 2 This is a circuit diagram of a standard circuit applied to CAT 6A far-end crosstalk according to an embodiment of the present invention;

[0024] Figure 3 This is a structural diagram of a calibration system for remote crosstalk of CAT 6A according to an embodiment of the present invention;

[0025] Figure 4 This is a structural diagram of a calibration system for CAT 6A remote crosstalk, according to another embodiment of the present invention.

[0026] Figure 5 yes Figure 4 A detailed schematic diagram of the calibration system applied to the remote crosstalk of CAT 6A;

[0027] Figure 6 yes Figure 4 , Figure 5 A schematic diagram showing the intersection of lines. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] Figure 2 This is a circuit diagram of a standard circuit applied to far-end crosstalk in CAT 6A, according to an embodiment of the present invention. (Reference) Figure 2 The present invention provides a standard circuit for far-end crosstalk of CAT 6A, which is applied in a standard.

[0030] The standard circuit of this invention is applied to the far-end crosstalk measurement circuit of CAT 6A. CAT 6A, or Augmented Category 6 Cable, is a commonly used transmission medium in structured cabling projects. It consists of two copper wires with insulating protective layers, twisted together at a certain density. The electromagnetic waves radiated by each wire during transmission are canceled out by the electromagnetic waves emitted by the other wire, effectively reducing the degree of signal interference.

[0031] refer to Figure 2 The standard circuit for CAT 6A far-end crosstalk of the present invention includes a first network connector RJ2 and a second network connector RJ1. The first network connector RJ2 includes multiple signal pairs. In this embodiment, the first network connector RJ2 includes a first transmit signal pair 12 and a first receive signal pair 36. It is understood that in other embodiments, the first network connector RJ2 may include other signal pairs besides the first transmit signal pair 12 and the first receive signal pair 36, such as spare signal pairs. Similarly, the second network connector RJ1 also includes multiple signal pairs.

[0032] The second network connector RJ1 is connected to the first network connector RJ2. The second network connector RJ1 includes a second transmit signal pair 12 and a second receive signal pair 36. The second transmit signal pair 12 of the second network connector RJ1 is connected to the first transmit signal pair 12 of the first network connector RJ2. A first load is connected in series between the second receive signal pairs 36 of the second network connector RJ1. Furthermore, none of the signal pairs of the first network connector RJ1 other than the first transmit signal pair 12 are directly connected to the signal pairs of the second network connector RJ1. For details, refer to... Figure 2 The first transmit signal pair 12 of the first network connector RJ2 is directly connected to the second transmit signal pair 12 of the second network connector RJ1, while other signal pairs of the first network connector RJ2, excluding the first transmit signal pair 12, are not directly connected to any signal pair of the second network connector RJ1. Typically, other signal pairs of the first network connector RJ2, excluding the first transmit signal pair 12, are connected to the second network connector RJ1 via two positive and negative signal pins 9 and 10. For example, the positive signal pin is 9 and the negative signal pin is 10; or the positive signal pin is 10 and the negative signal pin is 9. (Reference) Figure 2 The standard circuit for CAT 6A far-end crosstalk of the present invention has only one direct connection between the first transmit signal pair 12 of the first network connector RJ2 and the second transmit signal pair 12 of the second network connector RJ1, while the first receive signal pair 36 of the first network connector RJ2 and the signal pairs of the second network connector RJ1 are not directly connected. This is different from the far-end crosstalk standard circuits in the prior art, for example, see reference. Figure 1 In the prior art, the transmit signal pair 12 of the network connector on the left is directly connected to the transmit signal pair 12 on the right, the receive signal pair 36 of the network connector on the left is directly connected to the receive signal pair 36 on the right, and the spare signal pairs 45 and 78 on the left are also directly connected to the spare signal pairs 45 and 78 on the right, respectively.

[0033] Therefore, the standard circuit of the present invention for CAT 6A far-end crosstalk only directly connects the first transmit signal pair 12 of the first network connector RJ2 to the first transmit signal pair 12 of the second network connector RJ1, while disconnecting all paths unrelated to far-end crosstalk testing, and connecting a matching load in series between the second transmit signal pairs 12 of the second network connector RJ1, thereby avoiding parasitic crosstalk in the prior art and improving the performance of the standard circuit.

[0034] In specific implementation, refer to Figure 2The first network connector RJ2 further includes a first spare signal pair 45 and a second spare signal pair 78, and the second network connector RJ1 further includes a third spare signal pair 45 and a fourth spare signal pair 78. A second load is connected in series between the third spare signal pairs 45 of the second network connector RJ1, and a third load is connected in series between the fourth spare signal pairs 78 of the second network connector RJ1. The standard circuit of the present invention, by connecting a second load in series between the third spare signal pairs 45 of the second network connector RJ1 and a third load in series between the fourth spare signal pairs 78 of the second network connector RJ1, more effectively avoids parasitic crosstalk in the prior art, and further improves the performance of the standard circuit.

[0035] In specific implementation, refer to Figure 2 The first transmit signal pair 12 of the first network connector RJ2 includes a first transmit positive signal pin 1 and a first receive negative signal pin 2; the first receive signal pair 36 includes a first receive positive signal pin 3 and a first receive negative signal pin 6; the first spare signal pair 45 includes a first spare signal pin 4 and a second spare signal pin 5; and the second spare signal pair 78 includes a third spare signal pin 7 and a fourth spare signal pin 8.

[0036] In the first network connector RJ2, a first capacitor C1 is connected in series between the first transmit positive signal pin 1 and the first receive positive signal pin 3; a second capacitor C2 is connected in series between the first transmit positive signal pin 1 and the second spare signal pin 5; and a third capacitor C3 is connected in series between the first transmit positive signal pin 1 and the third spare signal pin 7. A fourth capacitor C4 is connected in series between the second transmit negative signal pin 2 and the fourth spare signal pin 8; a fifth capacitor C5 is connected in series between the second transmit negative signal pin 2 and the second receive negative signal pin 6; and a sixth capacitor C6 is connected in series between the second transmit negative signal pin 2 and the first spare signal pin 4. This invention provides a standard circuit for CAT 6A far-end crosstalk. It controls the far-end crosstalk value between line pairs by connecting six capacitors C1-C6, and optimizes the capacitor values ​​to cancel parasitic capacitance and inductance caused by PCB traces. This results in a smooth frequency response curve for far-end crosstalk without drastic fluctuations, thus ensuring stable and reliable calibration results.

[0037] In specific implementations, the capacitance values ​​of the first capacitor C1 to the sixth capacitor C6 can be set to be equal or not completely equal. In one embodiment of the present invention, the capacitance values ​​of the first capacitor C1 to the sixth capacitor C6 are all equal, and all are 0.1 microfarads (μF). In other embodiments, the capacitance values ​​of the first capacitor C1 to the sixth capacitor C6 can also be appropriately adjusted according to actual needs, so that the capacitance values ​​of the first capacitor C1 to the sixth capacitor C6 are slightly different. In specific implementations, since the geometric positions of different wire pair interfaces and traces on the actual circuit board are not exactly the same, the parasitic capacitance between the wire pairs is not exactly the same. By adjusting the capacitance values ​​of the first capacitor C1 to the sixth capacitor C6, the parasitic capacitance can be compensated, so that the crosstalk values ​​between each wire pair are as close as possible.

[0038] In specific implementation, refer to Figure 2 In the second network connector RJ1, its second transmit signal pair 12 includes a second transmit positive signal pin 1 and a second transmit negative signal pin 2. The second transmit positive signal pin 1 of the second network connector RJ1 is connected to the first transmit positive signal pin 1 of the first network connector RJ2, and the second transmit negative signal pin 2 of the second network connector RJ1 is connected to the second transmit negative signal pin 2 of the first network connector RJ2. This realizes the direct connection between the signal transmit pins of the first network connector RJ2 and the signal transmit pins of the second network connector RJ1.

[0039] In specific implementation, refer to Figure 2 The second network connector RJ1 has a second receive signal pair 36 including a second receive positive signal pin 3 and a second receive negative signal pin 6; a third spare signal pair 45 including a fifth spare signal pin 4 and a sixth spare signal pin 5; and a fourth spare signal pair 78 including a seventh spare signal pin 7 and an eighth spare signal pin 8. The first load is connected to the second receive positive signal pin 3 and the second receive negative signal pin 6 respectively, meaning one end of the first load is connected to the second receive positive signal pin 3 and the other end is connected to the second receive negative signal pin 6. The second load is connected to the fifth spare signal pin 4 and the sixth spare signal pin 5 respectively, meaning one end of the second load is connected to the fifth spare signal pin 4 and the other end is connected to the sixth spare signal pin 5. The third load is connected to the seventh spare signal pin 7 and the eighth spare signal pin 8 respectively, meaning one end of the third load is connected to the seventh spare signal pin 7 and the other end is connected to the eighth spare signal pin 8. The standard circuit of the present invention, by connecting a first load in series between the second receive signal pairs 36 of the second network connector RJ1, a second load in series between the third spare signal pairs 45, and a third load in series between the fourth spare signal pairs 78, more effectively avoids parasitic crosstalk in the prior art and further improves the performance of the standard circuit.

[0040] The present invention provides a standard circuit for far-end crosstalk in CAT 6A. In one embodiment, the first transmit signal pair 12 of the first network connector RJ2 is directly connected to the second transmit signal pair 12 of the second network connector RJ1, while other signal pairs of the first network connector RJ2 are not directly connected to the second transmit signal pair RJ1, thereby realizing the testing of far-end crosstalk of the first transmit signal pair 12 of the first network connector RJ2.

[0041] It is understood that the standard circuit for CAT 6A far-end crosstalk of the present invention can also test the far-end crosstalk performance of other signal pairs contained in the first network connector RJ2. For example, the far-end crosstalk performance of the first receive signal pair 36 of the first network connector RJ2 can be tested. In this case, the first receive signal pair 36 of the first network connector RJ2 is directly connected to the second receive signal pair 36 of the second network connector RJ1, while other signal pairs of the first network connector RJ2 other than the first receive signal pair 36 (e.g., the first transmit signal pair 12, the first spare signal pair 45, and the second spare signal pair 78 of the first network connector RJ2) are not directly connected to any signal pair of the second network connector RJ1. Similarly, other signal pairs of the first network connector RJ2 other than the first receive signal pair 36 are also indirectly connected to the second network connector through two positive and negative signal pins 9 and 10.

[0042] In practical implementation, when performing far-end crosstalk performance testing on each signal pair of the first network connector RJ2, the capacitance values ​​of C1-C6 can be adjusted to compensate for parasitic capacitance, making the crosstalk values ​​between each wire pair as close as possible. IEC61935 specifies that cable analyzers should be calibrated near the limit values. To comprehensively test the cable analyzer, the standard circuit of this invention achieves a far-end crosstalk standard both above and below the limit values ​​by adjusting the capacitance values ​​in the circuit. Specific capacitance values ​​used are shown in Table 1.

[0043] Table 1. Values ​​of capacitors in the far-end crosstalk standard.

[0044]

[0045] In Table 1, the first column, "Above (Below) Limit," represents the six capacitors in the standard corresponding to the limit (above (below)). The second column, "12," represents the standard corresponding to a certain line pair for each of the other line pairs. For example, "12" means the standard for 12 line pairs for each of the other line pairs (one standard module corresponds to all standard values ​​for a certain line pair for each of the other line pairs). C1 to C6 correspond to the various capacitors in the circuit diagram. The reason why the capacitance values ​​may vary slightly is that the geometric positions of the interfaces and traces of different line pairs on the actual circuit board cannot be exactly the same. As a result, the parasitic capacitance between line pairs is not exactly the same. Adjusting C1 to C6 is to compensate for the parasitic capacitance and make the crosstalk values ​​between the line pairs as close as possible.

[0046] When testing the far-end crosstalk performance of the first receive signal pair 36 of the first network connector RJ2, the first receive signal pair 36 is directly connected to the second receive signal pair 36 of the second network connector RJ1. At the same time, a first capacitor C1 is connected in series between the first receive positive signal pin 3 and the first transmit positive signal pin 1 of the first receive signal pair; a second capacitor C2 is connected in series between the first receive positive signal pin 3 and the second spare signal pin 5; a third capacitor C3 is connected in series between the first receive positive signal pin 3 and the third spare signal pin 7; a fourth capacitor C4 is connected in series between the first receive negative signal pin 6 and the second transmit negative signal pin 2; a fifth capacitor C5 is connected in series between the first receive negative signal pin 6 and the first spare signal pin 4; and a sixth capacitor is connected in series between the first receive negative signal pin 6 and the fourth spare signal pin 8. Similarly, when testing the far-end crosstalk performance of the first spare signal pair 45 or the second spare signal pair 78 of the first network connector RJ2, the first spare signal pair 45 or the second spare signal pair 78 can be directly connected to the corresponding signal pair of the second network connector RJ1, while disconnecting the signal pairs that are not related to far-end crosstalk, thereby realizing individual and accurate far-end crosstalk testing for each signal pair.

[0047] In specific implementations, the first load, second load, and third load can be resistors, capacitors, inductors, or other loads. In one embodiment of the invention, the first load, second load, and third load are resistors, and their resistance values ​​can be equal or not exactly equal. In this embodiment, the resistance values ​​of the first load, second load, and third load are equal, all set to 100 ohms, thereby achieving impedance matching.

[0048] In practical implementation, the first network connector RJ2 and the second network connector RJ1 can be configured as RJ45. RJ45 (Registered Jack 45) is a type of information socket connector in a cabling system. The connector consists of a plug (connector, crystal head) and a socket (module). The plug has 8 recesses and 8 contacts (for example, the first transmit signal pair 12, the first receive signal pair 36, the first spare signal pair 45 and the second spare signal pair 78 of the first network connector RJ2). The connector composed of these two components is connected between wires to achieve electrical continuity of the wires.

[0049] The present invention also provides a standard for CAT 6A remote crosstalk, the standard comprising a motherboard and a standard circuit of the above structure, the standard circuit being fixedly mounted on the motherboard.

[0050] The present invention provides a standard for calibrating far-end crosstalk in CAT 6A by integrating the standard circuit on the motherboard and fixing the wire pairs of the standard circuit on the motherboard.

[0051] See Figure 3 The present invention also provides a calibration system for CAT 6A remote crosstalk, the calibration system comprising a vector network analyzer 100, a standard 200 with the above-described structure, and a wire 300.

[0052] The vector network analyzer 100 and the standard 200 are connected by multiple wires 300, that is, one end of the multiple wires 300 is connected to the vector network analyzer 100, and the other end of the multiple wires 300 is connected to the standard 200.

[0053] In network cable analyzers, far-end crosstalk is represented by ACR-F (Attenuation to crosstalk ratio, farend). According to the definition of ACR-F, ACR-F can be considered as the difference between the path loss from the master link to the slave link and the path loss of the master link itself, i.e., ACR-F = IL. M2S -IL M2M In the formula, the subscript M2S represents the distance from the near end of the main link to the far end of the slave link, and M2M represents the distance from the near end of the main link to the far end of the main link. Converting ACR-F to the difference between two path losses is to calibrate the far-end crosstalk, i.e., calibrating the far-end crosstalk by measuring the two path losses.

[0054] refer to Figures 4-6The present invention also provides another embodiment of a calibration system for far-end crosstalk in CAT 6A, the calibration system comprising a master cable analyzer 1000, a first crossover cable 2000, a standard circuit 3000, a second crossover cable 4000, and a far-end cable analyzer 5000, wherein the master cable analyzer 1000, the first crossover cable 2000, the standard circuit 3000, the second crossover cable 4000 and the far-end cable analyzer 5000 are connected in sequence.

[0055] refer to Figure 4 , Figure 5 The master cable analyzer 1000 includes a third receiving signal pair 36 and a fifth backup signal pair 45. The first crossover cable 2000 includes a fourth receiving signal pair 36, a sixth backup signal pair 45, a third transmitting signal pair 12, and a seventh backup signal pair 78. The fourth receiving signal pair 36 of the first crossover cable 2000 is connected to the third receiving signal pair 36 of the master cable analyzer 1000, and the sixth backup signal pair 45 of the first crossover cable 2000 is connected to the fifth backup signal pair 45 of the master cable analyzer 1000.

[0056] The standard circuit 3000 adopts the above-described structure. The standard circuit 3000 includes a first transmit signal pair 12, a second backup signal pair 78, and a second transmit signal pair 12 and a fourth backup signal pair 78. The first transmit signal 12 of the standard circuit 3000 is connected to the third transmit signal pair 12 of the first cross line 2000, and the second backup signal pair 78 of the standard circuit 3000 is connected to the seventh backup signal pair 78 of the first cross line 2000.

[0057] The second cross line 4000 includes a fourth transmit signal pair 12, an eighth spare signal pair 78, a fifth receive signal pair 36, and a ninth spare signal pair 45. The fourth transmit signal pair 12 of the second cross line 4000 is connected to the second transmit signal pair 12 of the standard circuit 3000, and the eighth spare signal pair 78 of the second cross line 4000 is connected to the fourth spare signal pair 78 of the standard circuit 3000.

[0058] The remote cable analyzer 5000 includes a sixth receiving signal pair 36 and a tenth spare signal pair 45. The sixth receiving signal pair 36 of the remote cable analyzer 5000 is connected to the fifth receiving signal pair 36 of the second crossover cable 4000, and the tenth spare signal pair 45 of the remote cable analyzer 5000 is connected to the ninth spare signal pair 45 of the second crossover cable 4000.

[0059] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0060] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A standard circuit for far-end crosstalk in CAT 6A, characterized in that, include: A first network connector, the first network connector including a first transmit signal pair and a first receive signal pair; A second network connector is connected to the first network connector. The second network connector includes a second transmit signal pair and a second receive signal pair. The second transmit signal pair is connected to the first transmit signal pair, and a first load is connected in series between the second receive signal pairs. All signal pairs of the first network connector, except for the first transmit signal pair, are not directly connected to the signal pairs of the second network connector.

2. The standard circuit for far-end crosstalk of CAT 6A according to claim 1, characterized in that, The first network connector further includes a first backup signal pair and a second backup signal pair, and the second network connector further includes a third backup signal pair and a fourth backup signal pair, wherein a second load is connected in series between the third backup signal pairs and a third load is connected in series between the fourth backup signal pairs.

3. The standard circuit for far-end crosstalk of CAT 6A according to claim 2, characterized in that, The first transmit signal pair includes a first transmit positive signal pin and a first transmit negative signal pin; the first receive signal pair includes a first receive positive signal pin and a first receive negative signal pin; the first backup signal pair includes a first backup signal pin and a second backup signal pin; and the second backup signal pair includes a third backup signal pin and a fourth backup signal pin. Specifically, a first capacitor is connected in series between the first transmit positive signal pin and the first receive positive signal pin, a second capacitor is connected in series between the first transmit positive signal pin and the second backup signal pin, and a third capacitor is connected in series between the first transmit positive signal pin and the third backup signal pin.

4. The standard circuit for far-end crosstalk of CAT 6A according to claim 3, characterized in that, The second transmit signal pair includes a second transmit positive signal pin and a second transmit negative signal pin, wherein the second transmit positive signal pin is connected to the first transmit positive signal pin, the second transmit negative signal pin is connected to the first transmit negative signal pin, a fourth capacitor is connected in series between the second transmit negative signal pin and the fourth spare signal pin, and a sixth capacitor is connected in series between the second transmit negative signal pin and the first spare signal pin.

5. The standard circuit for far-end crosstalk of CAT 6A according to claim 4, characterized in that, The second receive signal pair includes a second receive positive signal pin and a second receive negative signal pin; the third backup signal pair includes a fifth backup signal pin and a sixth backup signal pin; the fourth backup signal pair includes a seventh backup signal pin and an eighth backup signal pin; a fifth capacitor is connected in series between the second transmit negative signal pin and the first receive negative signal pin. One end of the first load is connected to the second positive signal receiving pin, and the other end of the first load is connected to the second negative signal receiving pin; One end of the second load is connected to the fifth backup signal pin, and the other end of the second load is connected to the sixth backup signal pin; One end of the third load is connected to the seventh spare signal pin, and the other end of the third load is connected to the eighth spare signal pin.

6. The standard circuit for far-end crosstalk of CAT 6A according to any one of claims 2-5, characterized in that, The first load, the second load, and the third load each include a resistor, and the resistance values ​​of the first load, the second load, and the third load are equal.

7. The standard circuit for far-end crosstalk of CAT 6A according to any one of claims 1-5, characterized in that, The first network connector and the second network connector include RJ45.

8. A standard for far-end crosstalk in CAT 6A, characterized in that, include: Motherboard; The standard circuit as described in any one of claims 1-7, wherein the standard circuit is fixedly mounted on the motherboard.

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