RJ45 network port anti-EMC radiation circuit

Abstract

The utility model discloses an anti-EMC radiation circuit for an RJ45 network port, which relates to the technical field of EMC protection and comprises a network transformer module and an information socket connector module. According to the network transformer module, electrical isolation between a primary winding and a secondary winding is achieved through magnetic coupling, interference and fault propagation between different circuits are prevented, and the influence of common-mode interference is reduced; the EMC transmission energy of the network cable is reduced through common-mode inductors on four pairs of differential lines at the processing chip end of the network transformer; through common-mode inductors on four pairs of differential lines at the end, connected with the information socket connector, of the network transformer, radiation signals are restrained, and electromagnetic interference is reduced; the information socket connector module ensures reliable transmission of signals. According to the utility model, the common-mode inductors are additionally arranged at the two ends of the network transformer module, so that EMC transmission energy and radiation signals are effectively reduced, and the anti-interference capability of the whole circuit is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of EMC protection, specifically is a RJ45 network port anti-EMC radiation circuit. BACKGROUND

[0002] With the rapid development of information technology, the popularity rate of network communication equipment is higher and higher, and the electromagnetic interference problem between equipment is increasingly serious. In order to ensure the stable operation of network equipment, anti-EMC design becomes an important part of network communication equipment. The traditional network port anti-EMC measures are usually concentrated on hardware design, such as using shielding shell, filter and the like, but these measures often increase the cost and complexity of equipment.

[0003] The common anti-EMC design scheme mainly includes: using metal shell for physical shielding, which can effectively block external electromagnetic waves from entering the equipment interior, but increases the weight and cost of equipment; adding common mode choke coil in front of network transformer, which can reduce electromagnetic interference to a certain extent, but has limited effect on high frequency band interference; adopting anti-interference function integrated by special IC, which has high integration degree, but has high cost and poor flexibility.

[0004] The existing anti-EMC scheme has the common problems of high cost, large size and poor flexibility, especially in the aspect of EMI suppression in high frequency band, which is difficult to adapt to the rapidly changing network environment demand. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a RJ45 network port anti-EMC radiation circuit to solve the problems in the prior art.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme: a RJ45 network port anti-EMC radiation circuit, which comprises a network transformer module and an information socket connector module.

[0007] The network transformer module realizes electrical isolation between the primary winding and the secondary winding through magnetic coupling, prevents interference and fault propagation between different circuits, transmits differential signals through magnetic coupling effect, reduces the influence of common mode interference, reduces the EMC transmission energy of network cable through the common mode inductance on the 4 pairs of differential lines at the processing chip end of the network transformer, and suppresses the radiation signal and reduces electromagnetic interference through the common mode inductance on the 4 pairs of differential lines at the connection information socket connector end of the network transformer.

[0008] The processing chip end of the network transformer is one end of the network transformer connected to the processing chip or network interface chip; the connection information socket connector end of the network transformer is one end of the network transformer connected to the information socket connector.

[0009] The information socket connector module provides a standard physical interface through the information socket connector, ensuring reliable transmission of signals and mechanical protection.

[0010] According to the above scheme, the network transformer module is composed of a network transformer T1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a resistor R1, a resistor R2, a resistor R3, and a resistor R4.

[0011] The network transformer T1 is composed of four transformer units; the transformer unit is composed of a primary winding, a secondary winding, and a common mode inductor.

[0012] According to the above scheme, the primary winding is connected to one end of a pair of differential lines, and the secondary winding is connected to one end of another pair of differential lines, ensuring that the transformer unit can transmit signals from one side to the other side while providing electrical isolation and common mode noise suppression.

[0013] According to the above scheme, the network transformer T1 includes 24 pins, namely No. 1 TCT1 pin, No. 2 TD1+ pin, No. 3 TD1- pin, No. 4 TCT2 pin, No. 5 TD2+ pin, No. 6 TD2- pin, No. 7 TCT3 pin, No. 8 TD3+ pin, No. 9 TD3- pin, No. 10 TCT4 pin, No. 11 TD4+ pin, No. 12 TD4- pin, No. 13 MX4- pin, No. 14 MX4+ pin, No. 15 MCT4 pin, No. 16 MX3- pin, No. 17 MX3+ pin, No. 18 MCT3 pin, No. 19 MX2- pin, No. 20 MX2+ pin, No. 21 MCT2 pin, No. 22 MX1- pin, No. 23 MX1+ pin, and No. 24 MCT1 pin.

[0014] According to the above scheme, the information socket connector module is composed of an information socket connector X1, a capacitor C5, and a capacitor C6.

[0015] According to the above scheme, the information socket connector X1 includes 9 pins, namely No. 1 EXT-GETH-A-P pin, No. 2 EXT-GETH-A-N pin, No. 3 EXT-GETH-B-P pin, No. 4 EXT-GETH-B-N pin, No. 5 EXT-GETH-C-P pin, No. 6 EXT-GETH-C-N pin, No. 7 EXT-GETH-D-P pin, No. 8 EXT-GETH-D-N pin, and No. 9 S1 pin.

[0016] According to the above scheme, the No. 1 TCT1 pin of the network transformer T1 is connected in series with the capacitor C1 and then grounded; the No. 4 TCT2 pin of the network transformer T1 is connected in series with the capacitor C2 and then grounded; the No. 7 TCT3 pin of the network transformer T1 is connected in series with the capacitor C3 and then grounded; and the No. 10 TCT4 pin of the network transformer T1 is connected in series with the capacitor C4 and then grounded.

[0017] The capacitors C1, C2, C3 and C4 are respectively connected in series with the primary windings of each transformer unit and then grounded, for bypassing high-frequency noise and preventing high-frequency interference signals from interfering with the signal lines;

[0018] The No. 15 MCT4 pin of the network transformer T1 is connected in series with the resistor R4 and then grounded; the No. 18 MCT3 pin of the network transformer T1 is connected in series with the resistor R3 and then grounded; the No. 21 MCT2 pin of the network transformer T1 is connected in series with the resistor R2 and then grounded; and the No. 24 MCT1 pin of the network transformer T1 is connected in series with the resistor R1 and then grounded.

[0019] The resistors R1, R2, R3 and R4 are respectively connected in series with the secondary windings of each transformer unit and then grounded, for providing DC bias and limiting current.

[0020] The No. 2 TD1+ pin of the network transformer T1 is connected to GETH-A-P; the No. 3 TD1- pin of the network transformer T1 is connected to GETH-A-H; the No. 5 TD2+ pin of the network transformer T1 is connected to GETH-B-P; the No. 6 TD2- pin of the network transformer T1 is connected to GETH-B-N; the No. 8 TD3+ pin of the network transformer T1 is connected to GETH-C-P; the No. 9 TD3- pin of the network transformer T1 is connected to GETH-C-N; the No. 11 TD4+ pin of the network transformer T1 is connected to GETH-D-P; and the No. 12 TD4- pin of the network transformer T1 is connected to GETH-D-N.

[0021] The No. 13 MX4- pin of the network transformer T1 is connected to the No. 8 EXT-GETH-D-N pin of the information socket connector X1; the No. 14 MX4+ pin of the network transformer T1 is connected to the No. 7 EXT-GETH-D-P pin of the information socket connector X1; the No. 16 MX3- pin of the network transformer T1 is connected to the No. 6 EXT-GETH-C-N pin of the information socket connector X1; the No. 17 MX3+ pin of the network transformer T1 is connected to the No. 5 EXT-GETH-C-P pin of the information socket connector X1; the No. 19 MX2- pin of the network transformer T1 is connected to the No. 4 EXT-GETH-B-N pin of the information socket connector X1; the No. 20 MX2+ pin of the network transformer T1 is connected to the No. 3 EXT-GETH-B-P pin of the information socket connector X1; the No. 22 MX1- pin of the network transformer T1 is connected to the No. 2 EXT-GETH-A-N pin of the information socket connector X1; and the No. 23 MX1+ pin of the network transformer T1 is connected to the No. 1 EXT-GETH-A-P pin of the information socket connector X1.

[0022] According to the above scheme, the No. 9 S1 pin of the information socket connector X1 is connected in parallel with the capacitor C5 and the capacitor C6 and then grounded; and the high-frequency noise is further suppressed.

[0023] According to the above scheme, the four pairs of differential lines at the processing chip end of the network transformer include the No. 2 TD1+ pin and the No. 3 TD1- pin, the No. 5 TD2+ pin and the No. 6 TD2- pin, the No. 8 TD3+ pin and the No. 9 TD3- pin, and the No. 11 TD4+ pin and the No. 12 TD4- pin of the network transformer T1.

[0024] The four pairs of differential lines at the connection information socket connector end of the network transformer include the No. 13 MX4- pin and the No. 14 MX4+ pin, the No. 16 MX3- pin and the No. 17 MX3+ pin, the No. 19 MX2- pin and the No. 20 MX2+ pin, and the No. 22 MX1- pin and the No. 23 MX1+ pin of the network transformer T1.

[0025] According to the above scheme, the four transformer units include:

[0026] The No. 1 TCT1 pin, the No. 2 TD1+ pin, the No. 3 TD1- pin, the No. 22 MX1- pin, the No. 23 MX1+ pin, and the No. 24 MCT1 pin of the network transformer T1 constitute a transformer unit; wherein the No. 1 TCT1 pin is a primary winding, and the No. 24 MCT1 pin is a secondary winding.

[0027] The No.4 TCT2 pin, No.5 TD2+ pin, No.6 TD2- pin, No.19 MX2- pin, No.20 MX2+ pin and No.21 MCT2 pin of the network transformer T1 constitute a transformer unit; wherein the No.4 TCT2 pin is a primary winding, and the No.21 MCT2 pin is a secondary winding;

[0028] The No.7 TCT3 pin, No.8 TD3+ pin, No.9 TD3- pin, No.16 MX3- pin, No.17 MX3+ pin and No.18 MCT3 pin of the network transformer T1 constitute a transformer unit; wherein the No.7 TCT3 pin is a primary winding, and the No.18 MCT3 pin is a secondary winding;

[0029] The No.10 TCT4 pin, No.11 TD4+ pin, No.12 TD4- pin, No.13 MX4- pin, No.14 MX4+ pin and No.15 MCT4 pin of the network transformer T1 constitute a transformer unit; wherein the No.10 TCT4 pin is a primary winding, and the No.15 MCT4 pin is a secondary winding.

[0030] Compared with the prior art, the network transformer module has the beneficial effects that:

[0031] 1. The common mode inductance added at both ends of the network transformer module effectively reduces EMC transmission energy and radiation signals, and improves the anti-interference ability of the overall circuit.

[0032] 2. The standard RJ45 information socket connector is adopted, which not only ensures the reliability of signal transmission, but also facilitates the connection and maintenance with other network devices. BRIEF DESCRIPTION OF DRAWINGS

[0033] Fig. 1 Fig. 1 is a structural schematic view of a network transformer module of an RJ45 network port anti-EMC radiation circuit according to the present application;

[0034] Fig. 2 Fig. 2 is a structural schematic view of an information socket connector module of an RJ45 network port anti-EMC radiation circuit according to the present application. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0036] Embodiment: as Figs. 1-2The utility model provides a technical scheme, a RJ45 network port anti EMC radiation circuit, the circuit includes network transformer module and information socket connector module,

[0037] The network transformer module is composed of network transformer T1, capacitor C1, capacitor C2, capacitor C3, capacitor C4, resistor R1, resistor R2, resistor R3 and resistor R4.

[0038] The network transformer T1 is composed of four transformer units; the transformer unit is composed of a primary winding, a secondary winding and a common mode inductance.

[0039] The network transformer T1 includes 24 pins, 1st TCT1 pin, 2nd TD1+ pin, 3rd TD1- pin, 4th TCT2 pin, 5th TD2+ pin, 6th TD2- pin, 7th TCT3 pin, 8th TD3+ pin, 9th TD3- pin, 10th TCT4 pin, 11th TD4+ pin, 12th TD4- pin, 13th MX4- pin, 14th MX4+ pin, 15th MCT4 pin, 16th MX3- pin, 17th MX3+ pin, 18th MCT3 pin, 19th MX2- pin, 20th MX2+ pin, 21st MCT2 pin, 22nd MX1- pin, 23rd MX1+ pin and 24th MCT1 pin.

[0040] The information socket connector module is composed of information socket connector X1, capacitor C5 and capacitor C6; the information socket connector X1 is an RJ45 connector, is the connector of information socket in wiring system, has provided stable physical connection and good electrical performance, supports high speed data transmission, and can reduce electromagnetic interference through differential signal transmission.

[0041] The information socket connector X1 includes 9 pins, 1st EXT-GETH-A-P pin, 2nd EXT-GETH-A-N pin, 3rd EXT-GETH-B-P pin, 4th EXT-GETH-B-N pin, 5th EXT-GETH-C-P pin, 6th EXT-GETH-C-N pin, 7th EXT-GETH-D-P pin, 8th EXT-GETH-D-N pin and 9th S1 pin.

[0042] The 1st TCT1 pin of network transformer T1 is connected in series with capacitor C1 and grounded; the 4th TCT2 pin of network transformer T1 is connected in series with capacitor C2 and grounded; the 7th TCT3 pin of network transformer T1 is connected in series with capacitor C3 and grounded; the 10th TCT4 pin of network transformer T1 is connected in series with capacitor C4 and grounded;

[0043] The capacitor C1, capacitor C2, capacitor C3 and capacitor C4 are connected in series behind the primary winding of each transformer unit for bypassing high frequency noise and preventing high frequency interference signals from interfering with the signal line;

[0044] The pin 15 MCT4 of the network transformer T1 is connected in series with resistor R4 and grounded; the pin 18 MCT3 of the network transformer T1 is connected in series with resistor R3 and grounded; the pin 21 MCT2 of the network transformer T1 is connected in series with resistor R2 and grounded; the pin 24 MCT1 of the network transformer T1 is connected in series with resistor R1 and grounded;

[0045] The resistor R1, resistor R2, resistor R3 and resistor R4 are connected in series behind the secondary winding of each transformer unit for providing DC bias and limiting current;

[0046] The pin 2 TD1+ of the network transformer T1 is connected to GETH-A-P; the pin 3 TD1- of the network transformer T1 is connected to GETH-A-H; the pin 5 TD2+ of the network transformer T1 is connected to GETH-B-P; the pin 6 TD2- of the network transformer T1 is connected to GETH-B-N; the pin 8 TD3+ of the network transformer T1 is connected to GETH-C-P; the pin 9 TD3- of the network transformer T1 is connected to GETH-C-N; the pin 11 TD4+ of the network transformer T1 is connected to GETH-D-P; the pin 12 TD4- of the network transformer T1 is connected to GETH-D-N;

[0047] The pin 13 MX4- of the network transformer T1 is connected to the pin 8 EXT-GETH-D-N of the information socket connector X1; the pin 14 MX4+ of the network transformer T1 is connected to the pin 7 EXT-GETH-D-P of the information socket connector X1; the pin 16 MX3- of the network transformer T1 is connected to the pin 6 EXT-GETH-C-N of the information socket connector X1; the pin 17 MX3+ of the network transformer T1 is connected to the pin 5 EXT-GETH-C-P of the information socket connector X1; the pin 19 MX2- of the network transformer T1 is connected to the pin 4 EXT-GETH-B-N of the information socket connector X1; the pin 20 MX2+ of the network transformer T1 is connected to the pin 3 EXT-GETH-B-P of the information socket connector X1; the pin 22 MX1- of the network transformer T1 is connected to the pin 2 EXT-GETH-A-N of the information socket connector X1; the pin 23 MX1+ of the network transformer T1 is connected to the pin 1 EXT-GETH-A-P of the information socket connector X1.

[0048] The 9th S1 pin of the information socket connector X1 is connected with the parallel capacitor C5 and the capacitor C6 and then grounded, so as to further inhibit high-frequency noise.

[0049] The 4 pairs of differential lines at the processing chip end of the network transformer include the 2nd TD1+ pin and the 3rd TD1- pin, the 5th TD2+ pin and the 6th TD2- pin, the 8th TD3+ pin and the 9th TD3- pin and the 11th TD4+ pin and the 12th TD4- pin of the network transformer T1.

[0050] The 4 pairs of differential lines at the connection information socket connector end of the network transformer include the 13th MX4- pin and the 14th MX4+ pin, the 16th MX3- pin and the 17th MX3+ pin, the 19th MX2- pin and the 20th MX2+ pin and the 22nd MX1- pin and the 23rd MX1+ pin of the network transformer T1.

[0051] According to the above scheme, the four transformer units include:

[0052] The 1st TCT1 pin, the 2nd TD1+ pin, the 3rd TD1- pin, the 22nd MX1- pin, the 23rd MX1+ pin and the 24th MCT1 pin of the network transformer T1 constitute a transformer unit, wherein the 1st TCT1 pin is a primary winding, and the 24th MCT1 pin is a secondary winding.

[0053] The 4th TCT2 pin, the 5th TD2+ pin, the 6th TD2- pin, the 19th MX2- pin, the 20th MX2+ pin and the 21st MCT2 pin of the network transformer T1 constitute a transformer unit, wherein the 4th TCT2 pin is a primary winding, and the 21st MCT2 pin is a secondary winding.

[0054] The 7th TCT3 pin, the 8th TD3+ pin, the 9th TD3- pin, the 16th MX3- pin, the 17th MX3+ pin and the 18th MCT3 pin of the network transformer T1 constitute a transformer unit, wherein the 7th TCT3 pin is a primary winding, and the 18th MCT3 pin is a secondary winding.

[0055] The 10th TCT4 pin, the 11th TD4+ pin, the 12th TD4- pin, the 13th MX4- pin, the 14th MX4+ pin and the 15th MCT4 pin of the network transformer T1 constitute a transformer unit, wherein the 10th TCT4 pin is a primary winding, and the 15th MCT4 pin is a secondary winding.

[0056] The working principle of the utility model is:

[0057] The network transformer module realizes electrical isolation between the primary winding and the secondary winding through magnetic coupling, prevents interference and fault propagation between different circuits, transmits differential signals through magnetic coupling, reduces the influence of common-mode interference, reduces the EMC transmission energy of the network cable through the common-mode inductance on the 4 pairs of differential lines at the processing chip end of the network transformer, and suppresses the radiation signal and reduces electromagnetic interference through the common-mode inductance on the 4 pairs of differential lines at the connection information socket connector end of the network transformer.

[0058] The processing chip end of the network transformer is an end of the network transformer connected to a processing chip or a network interface chip; and the connection information socket connector end of the network transformer is an end of the network transformer connected to an information socket connector.

[0059] The information socket connector module provides a standard physical interface through the information socket connector, ensures reliable transmission of signals, and provides mechanical protection.

[0060] The network transformer module is composed of a network transformer, a capacitor and a resistor; the capacitor is connected to the ground after the primary winding of each transformer unit, used for bypassing high-frequency noise and preventing high-frequency interference signals from interfering with signal lines; and the resistor is connected to the ground after the secondary winding of each transformer unit, used for providing DC bias and limiting current.

[0061] The network transformer is composed of four transformer units; each of the four transformer units is responsible for transmitting a group of differential signals, and realizes electrical isolation between the primary winding and the secondary winding through magnetic coupling; and the transformer unit is composed of a primary winding, a secondary winding and a common-mode inductor.

[0062] The primary winding is connected to one end of a pair of differential lines, and the secondary winding is connected to one end of another pair of differential lines, ensuring that the transformer unit can transmit signals from one side to the other side while providing electrical isolation and common-mode noise suppression.

[0063] The information socket connector module is composed of an information socket connector and a capacitor. The information socket connector is an RJ45 connector, which is a connector of the information socket in the wiring system, provides stable physical connection and good electrical performance, supports high-speed data transmission, and can reduce electromagnetic interference through differential signal transmission. The information socket connector is connected to the ground in parallel with the capacitor; used for further suppressing high-frequency noise.

[0064] It is apparent for a person skilled in the art that the present application is not restricted to the details of the above exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary only, and not limiting, the scope of the present application being defined by the appended claims rather than the above description, and all changes coming within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. An RJ45 network port anti-EMC radiation circuit, characterized by: The circuit comprises a network transformer module and an information socket connector module; The network transformer module realizes electrical isolation between the primary winding and the secondary winding through magnetic coupling, prevents interference and fault propagation between different circuits, transmits differential signals through magnetic coupling, reduces the influence of common-mode interference, reduces the EMC transmission energy of the network cable through the common-mode inductance on the 4 pairs of differential lines at the processing chip end of the network transformer, and suppresses the radiation signal and reduces electromagnetic interference through the common-mode inductance on the 4 pairs of differential lines at the information socket connector end of the network transformer. The processing chip end of the network transformer is one end of the network transformer connected to the processing chip or the network interface chip; and the information socket connector end of the network transformer is one end of the network transformer connected to the information socket connector. The information socket connector module provides a standard physical interface through the information socket connector, ensures reliable transmission of signals and mechanical protection.

2. The RJ45 network port anti-EMC radiation circuit according to claim 1, wherein: The network transformer module is composed of a network transformer T1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a resistor R1, a resistor R2, a resistor R3 and a resistor R4. The network transformer T1 is composed of four transformer units; and each transformer unit is composed of a primary winding, a secondary winding and a common-mode inductance.

3. The RJ45 network port anti-EMC radiation circuit according to claim 2, wherein: The primary winding is connected to one end of a pair of differential lines, and the secondary winding is connected to one end of another pair of differential lines, so as to ensure that the transformer unit can transmit signals from one side to the other side while providing electrical isolation and common-mode noise suppression.

4. The RJ45 network port anti-EMC radiation circuit according to claim 2, wherein: The network transformer T1 comprises 24 pins, i.e. a No. 1 TCT1 pin, a No. 2 TD1+ pin, a No. 3 TD1- pin, a No. 4 TCT2 pin, a No. 5 TD2+ pin, a No. 6 TD2- pin, a No. 7 TCT3 pin, a No. 8 TD3+ pin, a No. 9 TD3- pin, a No. 10 TCT4 pin, a No. 11 TD4+ pin, a No. 12 TD4- pin, a No. 13 MX4- pin, a No. 14 MX4+ pin, a No. 15 MCT4 pin, a No. 16 MX3- pin, a No. 17 MX3+ pin, a No. 18 MCT3 pin, a No. 19 MX2- pin, a No. 20 MX2+ pin, a No. 21 MCT2 pin, a No. 22 MX1- pin, a No. 23 MX1+ pin and a No. 24 MCT1 pin.

5. The RJ45 network port anti-EMC radiation circuit according to claim 4, wherein: The information socket connector module is composed of an information socket connector X1, a capacitor C5 and a capacitor C6.

6. The RJ45 network port anti-EMC radiation circuit according to claim 5, wherein: The information socket connector X1 includes 9 pins, which are No. 1 EXT-GETH-A-P pin, No. 2 EXT-GETH-A-N pin, No. 3 EXT-GETH-B-P pin, No. 4 EXT-GETH-B-N pin, No. 5 EXT-GETH-C-P pin, No. 6 EXT-GETH-C-N pin, No. 7 EXT-GETH-D-P pin, No. 8 EXT-GETH-D-N pin and No. 9 S1 pin.

7. The EMC radiation resistant circuit of an RJ45 network port according to claim 6, characterized in that: No. 1 TCT1 pin of the network transformer T1 is connected to ground in series with capacitor C1; No. 4 TCT2 pin of the network transformer T1 is connected to ground in series with capacitor C2; No. 7 TCT3 pin of the network transformer T1 is connected to ground in series with capacitor C3; No. 10 TCT4 pin of the network transformer T1 is connected to ground in series with capacitor C4; No. 15 MCT4 pin of the network transformer T1 is connected to ground in series with resistor R4; No. 18 MCT3 pin of the network transformer T1 is connected to ground in series with resistor R3; No. 21 MCT2 pin of the network transformer T1 is connected to ground in series with resistor R2; No. 24 MCT1 pin of the network transformer T1 is connected to ground in series with resistor R1; No. 2 TD1+ pin of the network transformer T1 is connected to GETH-A-P; No. 3 TD1- pin of the network transformer T1 is connected to GETH-A-H; No. 5 TD2+ pin of the network transformer T1 is connected to GETH-B-P; No. 6 TD2- pin of the network transformer T1 is connected to GETH-B-N; No. 8 TD3+ pin of the network transformer T1 is connected to GETH-C-P; No. 9 TD3- pin of the network transformer T1 is connected to GETH-C-N; No. 11 TD4+ pin of the network transformer T1 is connected to GETH-D-P; No. 12 TD4- pin of the network transformer T1 is connected to GETH-D-N; The No. 13 MX4- pin of the network transformer T1 is connected to the No. 8 EXT-GETH-D-N pin of the information socket connector X1; the No. 14 MX4+ pin of the network transformer T1 is connected to the No. 7 EXT-GETH-D-P pin of the information socket connector X1; the No. 16 MX3- pin of the network transformer T1 is connected to the No. 6 EXT-GETH-C-N pin of the information socket connector X1; the No. 17 MX3+ pin of the network transformer T1 is connected to the No. 5 EXT-GETH-C-P pin of the information socket connector X1; the No. 19 MX2- pin of the network transformer T1 is connected to the No. 4 EXT-GETH-B-N pin of the information socket connector X1; the No. 20 MX2+ pin of the network transformer T1 is connected to the No. 3 EXT-GETH-B-P pin of the information socket connector X1; the No. 22 MX1- pin of the network transformer T1 is connected to the No. 2 EXT-GETH-A-N pin of the information socket connector X1; and the No. 23 MX1+ pin of the network transformer T1 is connected to the No. 1 EXT-GETH-A-P pin of the information socket connector X1.

8. The EMC radiation resistant circuit of an RJ45 network port according to claim 6, characterized in that: The No. 9 S1 pin of the information socket connector X1 is grounded after being connected in parallel with the capacitor C5 and the capacitor C6.

9. The EMC radiation resistant circuit of an RJ45 network port according to claim 4, characterized in that: The four pairs of differential lines at the processing chip end of the network transformer include the No. 2 TD1+ pin and the No. 3 TD1- pin, the No. 5 TD2+ pin and the No. 6 TD2- pin, the No. 8 TD3+ pin and the No. 9 TD3- pin, and the No. 11 TD4+ pin and the No. 12 TD4- pin of the network transformer T1; The four pairs of differential lines at the connection information socket connector end of the network transformer include the No. 13 MX4- pin and the No. 14 MX4+ pin, the No. 16 MX3- pin and the No. 17 MX3+ pin, the No. 19 MX2- pin and the No. 20 MX2+ pin, and the No. 22 MX1- pin and the No. 23 MX1+ pin of the network transformer T1.

10. The RJ45 network port EMC radiation rejection circuit of claim 4, wherein: The four transformer units include: The No. 1 TCT1 pin, the No. 2 TD1+ pin, the No. 3 TD1- pin, the No. 22 MX1- pin, the No. 23 MX1+ pin, and the No. 24 MCT1 pin of the network transformer T1 constitute a transformer unit; wherein the No. 1 TCT1 pin is a primary winding, and the No. 24 MCT1 pin is a secondary winding; The No. 4 TCT2 pin, the No. 5 TD2+ pin, the No. 6 TD2- pin, the No. 19 MX2- pin, the No. 20 MX2+ pin, and the No. 21 MCT2 pin of the network transformer T1 constitute a transformer unit; wherein the No. 4 TCT2 pin is a primary winding, and the No. 21 MCT2 pin is a secondary winding; The No. 7 TCT3 pin, No. 8 TD3+ pin, No. 9 TD3- pin, No. 16 MX3- pin, No. 17 MX3+ pin and No. 18 MCT3 pin of the network transformer T1 constitute a transformer unit; The No. 7 TCT3 pin is a primary winding, and the No. 18 MCT3 pin is a secondary winding. The No. 10 TCT4 pin, No. 11 TD4+ pin, No. 12 TD4- pin, No. 13 MX4- pin, No. 14 MX4+ pin and No. 15 MCT4 pin of the network transformer T1 constitute a transformer unit; the No. 10 TCT4 pin is a primary winding, and the No. 15 MCT4 pin is a secondary winding.

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