Printed circuit board (PCB) compatible with integrated network transformer and separated network transformer and interface device

Abstract

The utility model discloses a PCB compatible with an integrated network transformer and a separated network transformer and an interface device. The PCB comprises a reserved mounting area, is provided with N groups of input ports, N groups of output ports, a first connecting end, a second connecting end and N groups of internal reserved connecting wires, and is used for selectively mounting the integrated plug-in packaging transformer or the separated patch packaging transformer. The technical problems that in the prior art, only a single type of network transformer can be installed on a PCB used for an Ethernet interface, the PCB needs to be repeatedly designed for different transformers, the design cost is increased, and the types of prepared PCB materials are increased are solved. By arranging the reserved mounting area and the connecting circuit on the same PCB, one PCB can be selectively provided with the integrated plug-in packaging transformer or the separated patch packaging transformer, and the technical purposes of saving the design cost of the PCB and reducing the types of prepared materials of the PCB are achieved.

Description

Technical Field

[0001] This application relates to the field of Ethernet interfaces, and more particularly to a PCB board and interface device compatible with integrated and discrete network transformers. Background Technology

[0002] Ethernet interfaces are widely used in network communication equipment. The network transformer in the Ethernet interface is an important component for signal transmission, and it mainly includes two types: traditional integrated plug-in packaged transformers and newer discrete surface-mount packaged transformers.

[0003] Currently, PCB design typically focuses on only one type of network transformer: either a PCB for an integrated through-hole package transformer or a discrete surface-mount package transformer. This design approach leads to the need for different PCBs for different application scenarios, resulting in redundant PCB design. Furthermore, because the PCB mounts only one type of network transformer, multiple PCBs need to be stocked to accommodate different transformer application requirements. This not only increases PCB design costs but also increases the variety of PCB components required.

[0004] Therefore, how to design a PCB board that is compatible with two types of network transformers to reduce redundant PCB design and material types is an urgent technical problem to be solved. Summary of the Invention

[0005] The main purpose of this application is to provide a PCB board and interface device compatible with integrated and discrete network transformers, aiming to solve the technical problem that the existing PCB boards used for Ethernet interfaces can only install a single type of network transformer, requiring repeated design of PCB boards for different transformers, which not only increases design costs, but also increases the variety of PCB board materials.

[0006] To achieve the above objectives, this application provides a PCB board compatible with both integrated and discrete network transformers, including a reserved mounting area. The reserved mounting area is provided with N sets of input ports, N sets of output ports, a first connection terminal, a second connection terminal, and N sets of internal reserved connection lines. The reserved mounting area is used to mount either an integrated through-hole package transformer or a discrete surface-mount package transformer. The integrated through-hole package transformer includes N sets of input pins, N sets of output pins, and a center tap pin. The discrete surface-mount package transformer includes N discrete transformers, each with N sets of input pins, N sets of output pins, and N ground pins. Each discrete transformer includes two capacitors and a transformer unit, each transformer unit having one set of input pins, one set of output pins, and one ground pin. N is a positive integer. Each set of input ports includes a positive port and a negative port for transmitting differential signals to the N sets of input pins; each set of output ports includes a positive port and a negative port for receiving differential signals from the N sets of output pins; a first connection terminal is used to connect to the center tap pin when the integrated plug-in packaged transformer is installed in the reserved installation area; a second connection terminal is used to connect to the N grounding pins when the discrete surface mount packaged transformer is installed in the reserved installation area; N sets of internal reserved connection lines include N sets of input segment connection lines, N sets of intermediate segment connection lines, and N sets of output segment connection lines. The N sets of input segment connection lines are connected to the corresponding N sets of input ports. The N sets of input segment connection lines and the N sets of intermediate segment connection lines are used to connect the respective capacitors. The N sets of intermediate segment connection lines and the N sets of output segment connection lines are used to connect the respective transformer units. The N sets of output segment connection lines are connected to the corresponding N sets of output ports.

[0007] Optionally, when the PCB board is used for 100 Mbps network transmission, N is 2, and the N sets of input ports and N sets of output ports are used to transmit two pairs of differential signals; the N sets of input segment connection lines, N sets of intermediate segment connection lines and N sets of output segment connection lines are arranged in two sets for connecting the installed discrete surface mount transformer.

[0008] Optionally, when the PCB board is used for gigabit network transmission, N is 4, and the N sets of input ports and N sets of output ports are used to transmit four pairs of differential signals; the N sets of input segment connection lines, N sets of intermediate segment connection lines and N sets of output segment connection lines are arranged in four sets for connecting the installed discrete surface mount transformer.

[0009] Optionally, the end of the N input ports furthest from the reserved installation area is electrically connected to the PHY chip, and the end of the N output ports furthest from the reserved installation area is electrically connected to the RJ45 network interface.

[0010] Optionally, when the PHY chip is driven by current, the first connection terminal is connected in series with the Smith circuit and then grounded, and the Smith circuit includes a resistor and a capacitor connected in series.

[0011] Optionally, when the PHY chip is driven by voltage, the first connection terminal is connected to the operating power supply of the PHY chip.

[0012] Optionally, the second connection terminal is directly grounded.

[0013] Optionally, the second connection terminal is connected in series with a 0Ω resistor and then grounded.

[0014] Optionally, the PCB board further includes N bidirectional protection diodes. When the integrated plug-in packaged transformer is installed, each bidirectional protection diode is connected in series between the positive and negative terminals of each input port.

[0015] In addition, to achieve the above objectives, this application also provides an Ethernet interface device, including the aforementioned PCB board.

[0016] The beneficial effects that this application can achieve are as follows:

[0017] By setting a reserved mounting area on the PCB board, and configuring N sets of input ports, N sets of output ports, a first connection terminal, a second connection terminal, and N sets of internal reserved connecting lines within this area, a single PCB board can be compatible with two different types of network transformers. Specifically: when installing an integrated through-hole package transformer, the N sets of input ports and N sets of output ports in the reserved mounting area are connected to the N sets of input pins and N sets of output pins of the integrated through-hole package transformer, and simultaneously connected to the center tap pin of the integrated through-hole package transformer through the first connection terminal; when installing a discrete surface-mount package transformer, the N sets of internal reserved connecting lines in the reserved mounting area are used to connect the capacitor and transformer unit through their input segment connecting lines, middle segment connecting lines, and output segment connecting lines, respectively, and connected to the ground pin through the second connection terminal. By reserving the mounting area, the same PCB board can be selected to install different types of transformers as needed, thereby avoiding the need for repeatedly designing PCB boards for different transformers, saving design costs, and also reducing the types of PCB board components required. Attached Figure Description

[0018] Figure 1 This is a basic structural diagram of the reserved installation area in the first embodiment of this application;

[0019] Figure 2 This is a schematic diagram of the layout design of the reserved installation area in the first embodiment of this application;

[0020] Figure 3This is a schematic diagram of the installation structure of the discrete surface-mount packaged transformer in the first embodiment of this application;

[0021] Figure 4 This is a schematic diagram of the structure of the reserved installation area for 100 Mbps network transmission in the first embodiment of this application;

[0022] Figure 5 This is a circuit diagram of an integrated plug-in packaged transformer and a separate surface-mount packaged transformer for 100 Mbps network transmission in the first embodiment of this application;

[0023] Figure 6 This is a schematic diagram of the installation area layout of a discrete surface-mount transformer for 100 Mbps network transmission in the first embodiment of this application;

[0024] Figure 7 This is a partial layout diagram of a discrete surface-mount transformer for 100 Mbps network transmission in the first embodiment of this application;

[0025] Figure 8 This is a schematic diagram of the structure of the reserved installation area for gigabit network transmission in the first embodiment of this application;

[0026] Figure 9 This is a circuit diagram of an integrated plug-in packaged transformer and a separate surface-mount packaged transformer for gigabit network transmission in the first embodiment of this application;

[0027] Figure 10 This is a schematic diagram of the installation area layout of a discrete surface-mount transformer for gigabit network transmission in the first embodiment of this application;

[0028] Figure 11 This is a partial layout diagram of a discrete surface-mount packaged transformer for gigabit network transmission in the first embodiment of this application;

[0029] Figure 12 This is a schematic diagram of the external connection of the reserved installation area in the first embodiment of this application.

[0030] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component under a certain preset posture (as shown in the figure). If the preset posture changes, the directional indicator will also change accordingly.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0035] The first embodiment of this application provides a PCB board compatible with both integrated and discrete network transformers, including a reserved mounting area. This reserved mounting area is provided with N sets of input ports, N sets of output ports, a first connection terminal, a second connection terminal, and N sets of internal reserved connection lines. The reserved mounting area is used to mount either an integrated through-hole package transformer or a discrete surface-mount package transformer. The integrated through-hole package transformer includes N sets of input pins, N sets of output pins, and a center tap pin. The discrete surface-mount package transformer includes N discrete transformers, each with N sets of input pins, N sets of output pins, and N ground pins. Each discrete transformer includes two capacitors and a transformer unit, each transformer unit having one set of input pins, one set of output pins, and one ground pin, where N is a positive integer. Each of the N sets of input ports includes a positive port and a negative port for transmitting differential signals to the N sets of input pins. Each of the N sets of output ports includes a positive port and a negative port for receiving differential signals from the N sets of output pins. The first connection terminal is used to connect to the center tap pin when installing the integrated plug-in packaged transformer in the reserved installation area. The second connection terminal is used to connect to the N grounding pins when installing the discrete surface mount packaged transformer in the reserved installation area. N sets of internal reserved connection lines include N sets of input segment connection lines, N sets of intermediate segment connection lines, and N sets of output segment connection lines. The N sets of input segment connection lines are connected to the corresponding N sets of input ports. The N sets of input segment connection lines and the N sets of intermediate segment connection lines are used to connect each of the capacitors. The N sets of intermediate segment connection lines and the N sets of output segment connection lines are used to connect each of the transformer units. The N sets of output segment connection lines are connected to the corresponding N sets of output ports.

[0036] Specifically, such as Figure 1 As shown, the provided PCB board, compatible with both integrated and discrete network transformers, includes a reserved mounting area. This reserved mounting area is equipped with N sets of input ports, N sets of output ports, a first connection terminal, a second connection terminal, and N sets of internal reserved connection lines. Here, N is a positive integer.

[0037] like Figure 2 As shown, the reserved installation area, in its actual layout design on the PCB board, achieves the installation requirements for two different types of network transformers within the limited PCB board space by rationally planning the positions of each connection port and connecting line. This layout design not only saves PCB board space but also optimizes the wiring length of signal lines.

[0038] This reserved installation area is for selectively installing two different types of network transformers: integrated through-hole package transformers or discrete surface-mount package transformers. Specifically, the integrated through-hole package transformer includes N sets of input pins, N sets of output pins, and a center tap pin. The discrete surface-mount package transformer includes N discrete transformers, each of which includes two capacitors and a transformer unit. Each transformer unit has one set of input pins, one set of output pins, and one ground pin. Therefore, the pins of the N discrete transformers constitute the N sets of input pins, N sets of output pins, and N ground pins of the discrete surface-mount package transformer.

[0039] The reserved installation area has N sets of input ports, N sets of output ports, a first connection terminal, a second connection terminal, and N sets of internal reserved connection cables.

[0040] Each of the N input ports includes a pair of positive and negative ports for differential signal transmission. The positive port transmits the positive signal of the differential signal, and the negative port transmits the negative signal, together enabling the transmission of the differential signal to the N input pins. Similarly, each of the N output ports also includes a pair of positive and negative ports. The positive port receives the positive signal of the differential signal, and the negative port receives the negative signal, together enabling the reception of the differential signal from the N output pins.

[0041] The first and second connection terminals are used to meet the connection requirements of different types of transformers. Specifically, when installing an integrated plug-in packaged transformer in the reserved installation area, the center tap pin of the integrated plug-in packaged transformer is connected to the first connection terminal to realize the center tap connection function. When installing a discrete surface-mount packaged transformer in the reserved installation area, the N grounding pins of the discrete surface-mount packaged transformer are connected to the second connection terminal to realize the grounding function. Through the first and second connection terminals, the PCB board can realize the corresponding connection requirements according to the type of transformer installed through different connection terminals.

[0042] The reserved installation area includes N sets of internal pre-installed connection lines for the installation and connection of the discrete surface-mount transformer. Each set of internal pre-installed connection lines includes input section connection lines, intermediate section connection lines, and output section connection lines, used to achieve signal transmission connections when installing the discrete surface-mount transformer. Specifically, refer to... Figure 3The N sets of input segment connection lines are connected to the N sets of input ports respectively; the N sets of input segment connection lines and the N sets of intermediate segment connection lines are used to connect the capacitors; the N sets of intermediate segment connection lines and the N sets of output segment connection lines are used to connect the transformer units respectively; the N sets of output segment connection lines are connected to the N sets of output ports respectively. When using a discrete surface-mount packaged transformer, the differential signal is first transmitted from the N sets of input ports through the N sets of input segment connection lines, then through the capacitors connected to the N sets of intermediate segment connection lines, then through the transformer units connected to the N sets of output segment connection lines, and finally transmitted to the N sets of output ports through the N sets of output segment connection lines, thereby realizing the complete signal transmission function.

[0043] The aforementioned PCB board allows for the selective mounting of either integrated through-hole transformers or discrete surface-mount transformers, enabling compatibility with two different types of network transformers. Furthermore, the pre-reserved mounting area accommodates various network transformer types, eliminating the need for redundant PCB design for each type, thus avoiding repetitive PCB design issues. Simultaneously, a single PCB board can meet the installation requirements of two types of network transformers, effectively reducing the variety of PCB components required and lowering production and management costs.

[0044] As an optional implementation, when the PCB board is used for 100 Mbps network transmission, N is 2, and the N sets of input ports and N sets of output ports are used to transmit two pairs of differential signals; the N sets of input segment connection lines, N sets of intermediate segment connection lines and N sets of output segment connection lines are arranged in two sets for connecting the installed discrete surface mount transformer.

[0045] Specifically, such as Figure 4-7 As shown, when the PCB board is used for 100 Mbps network transmission, the value of N is 2. In this embodiment, the reserved mounting area of ​​the PCB board is provided with 2 sets of input ports and 2 sets of output ports for transmitting two pairs of differential signals.

[0046] Figure 4 This is a schematic diagram illustrating the principle of reserving an installation area for 100 Mbps network transmission, showing the transmission structure of two pairs of differential signals. Figure 5 This diagram illustrates the circuit connection relationships of an integrated plug-in packaged transformer and a separate surface mount packaged transformer in this embodiment.

[0047] When installing the integrated plug-in packaged transformer, its two sets of input pins are connected to two sets of input ports, its two sets of output pins are connected to two sets of output ports, and its center tap pin is connected to the first connection terminal, thereby realizing the transmission of two pairs of differential signals.

[0048] When installing a split-type surface mount transformer, the two sets of input section connection lines, two sets of intermediate section connection lines, and two sets of output section connection lines in the reserved installation area are respectively connected to the corresponding parts of the split-type surface mount transformer. Figure 6 This demonstrates the overall layout scheme of various components when installing a discrete surface-mount transformer in a reserved installation area. Figure 7 This is a partial enlarged view of the installation of a discrete surface-mount transformer in the reserved installation area. It clearly marks the specific locations of each transformer unit (where T1 and T2 form one transformer unit, and T3 and T4 form another transformer unit) and capacitors (C21-C24), showing the layout details of each component.

[0049] The PCB board described above for 100 Mbps networks not only meets the transmission requirements of two pairs of differential signals in 100 Mbps network transmission scenarios, but also allows for flexible selection of integrated plug-in packaged transformers or separate surface-mount packaged transformers according to actual application needs, achieving compatibility of the PCB board with different types of transformers.

[0050] As an optional implementation, when the PCB board is used for gigabit network transmission, N is 4, and the N sets of input ports and N sets of output ports are used to transmit four pairs of differential signals; the N sets of input segment connection lines, N sets of intermediate segment connection lines and N sets of output segment connection lines are arranged in four sets for connecting the installed discrete surface mount transformer.

[0051] Specifically, such as Figure 8-11 As shown, when the PCB board is used for gigabit network transmission, the value of N is 4. In this embodiment, the reserved mounting area of ​​the PCB board is provided with 4 sets of input ports and 4 sets of output ports for transmitting four pairs of differential signals.

[0052] Figure 8 This is a schematic diagram illustrating the principle of reserving an installation area for gigabit network transmission, showing the transmission structure of four pairs of differential signals. Figure 9 This diagram illustrates the circuit connection relationships of an integrated plug-in packaged transformer and a separate surface mount packaged transformer in this embodiment.

[0053] When installing the integrated plug-in packaged transformer, its 4 sets of input pins are connected to 4 sets of input ports, its 4 sets of output pins are connected to 4 sets of output ports, and the center tap pin is connected to the first connection terminal, thereby realizing the transmission of four pairs of differential signals.

[0054] When installing a split-type surface mount transformer, the four sets of input section connection lines, four sets of intermediate section connection lines, and four sets of output section connection lines in the reserved installation area are connected to the corresponding parts of the split-type surface mount transformer. Figure 10This demonstrates the overall layout scheme of various components when installing a discrete surface-mount transformer in a reserved installation area. Figure 11 This is a partial enlarged view of the installation of a discrete surface-mount transformer in the reserved installation area. It clearly marks the specific locations of each transformer unit (T5 and T6 form one transformer unit, T7 and T8 form one transformer unit, T9 and T10 form one transformer unit, and T11 and T12 form one transformer unit) and capacitors (C25-C34), showing the layout details of each component.

[0055] The aforementioned PCB board for gigabit networks not only fulfills the transmission requirements of four pairs of differential signals in gigabit network transmission scenarios, but also allows for flexible selection of integrated plug-in packaged transformers or separate surface-mount packaged transformers according to actual application needs, achieving compatibility of the PCB board with different types of transformers.

[0056] As an optional implementation, the end of the N input ports furthest from the reserved installation area is electrically connected to the PHY chip, and the end of the N output ports furthest from the reserved installation area is electrically connected to the RJ45 network interface.

[0057] Specifically, such as Figure 12 As shown, the PCB board also has a PHY chip and an RJ45 network interface located outside the reserved mounting area. The N sets of input ports, with the ends furthest from the reserved mounting area, are electrically connected to the PHY chip to receive differential signals from it. The N sets of output ports, with the ends furthest from the reserved mounting area, are electrically connected to the RJ45 network interface to transmit differential signals to it. This connection method establishes a complete transmission path for differential signals between the PHY chip and the RJ45 network interface.

[0058] As an optional implementation, when the PHY chip is driven by current, the first connection terminal is connected in series with the Smith circuit and then grounded, and the Smith circuit includes a resistor and a capacitor connected in series.

[0059] Specifically, when installing an integrated plug-in packaged transformer in the reserved installation area, the first connection terminal is connected differently according to the driving method of the PHY chip.

[0060] like Figure 4 , 5 and Figure 8 , 9 As shown, when the PHY chip is driven by current, the first connection terminal is grounded through a Smith circuit. Specifically, the Smith circuit includes a resistor and a capacitor connected in series. The first connection terminal is grounded after passing through the series resistor and capacitor in sequence, which is used to realize the grounding function of the center tap pin. Figure 5 and Figure 9 In the Smith circuit, the resistance is 75Ω and the capacitance is 1000pF, which enables reliable grounding of the center tap of the integrated plug-in packaged transformer under current-driven mode.

[0061] As an optional implementation, when the PHY chip is driven by voltage, the first connection terminal is connected to the operating power supply of the PHY chip.

[0062] Specifically, when installing an integrated plug-in packaged transformer in the reserved installation area, if the PHY chip is driven by voltage, the first connection terminal is electrically connected to the PHY chip's operating power supply. This connection method enables the power connection function of the center tap of the integrated plug-in packaged transformer under voltage-driven mode.

[0063] As an optional implementation, the second connection terminal is directly grounded.

[0064] Specifically, when installing a discrete surface-mount transformer in a reserved installation area, its N grounding pins need to be grounded. For example... Figure 3 , 8 As shown, the second connection terminal is directly grounded, for example, through a grounding trace on the PCB board, to achieve a reliable grounding connection for the N grounding pins of the discrete surface mount transformer.

[0065] As an optional implementation, the second connection terminal is connected in series with a 0Ω resistor and then grounded.

[0066] Specifically, when installing a discrete surface-mount transformer in a reserved installation area, its N grounding pins need to be grounded. For example... Figure 4 As shown, the second connection terminal is grounded through a 0Ω resistor. Specifically, one end of the 0Ω resistor is connected to the second connection terminal, and the other end is grounded, used to achieve a reliable grounding connection for the N grounding pins of the discrete surface mount transformer. The 0Ω resistor can also be used as a jumper during the debugging of the discrete surface mount transformer, facilitating PCB board testing and maintenance.

[0067] As an optional implementation, the PCB board also includes N bidirectional protection diodes. When the integrated plug-in packaged transformer is installed, each bidirectional protection diode is connected in series between the positive and negative ports of each set of input ports.

[0068] Specifically, the PCB board also includes N bidirectional protection diodes to improve its reliability. When installing an integrated through-hole packaged transformer in the reserved mounting area, the N bidirectional protection diodes are connected in series with the N sets of input ports. Specifically, from... Figure 5 ,9 As can be seen, bidirectional protection diodes are installed at the input terminals of the integrated plug-in transformer to prevent the PCB board from being affected by static electricity or other interference during use. Each bidirectional protection diode is connected in series between the positive and negative terminals of each input port to protect the differential signal transmission lines.

[0069] The second embodiment of this application provides an Ethernet interface device, including the PCB board in the first embodiment.

[0070] Specifically, the Ethernet interface device achieves compatibility with different types of network transformers by using the PCB board in the first embodiment described above.

[0071] By adopting the above-mentioned PCB board, the Ethernet interface device can not only selectively install integrated plug-in packaged transformers or separate surface-mount packaged transformers according to actual needs, but also be applicable to 100 Mbps and 1 Gbps network transmission scenarios, with strong compatibility and applicability.

[0072] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A PCB board compatible with both integrated and discrete network transformers, characterized in that, include: A reserved installation area is provided for installing either an integrated plug-in packaged transformer or a discrete surface-mount packaged transformer. The integrated plug-in packaged transformer includes N sets of input pins, N sets of output pins, and a center tap pin. The discrete surface-mount packaged transformer includes N discrete transformers, each with N sets of input pins, N sets of output pins, and N ground pins. Each discrete transformer includes two capacitors and a transformer unit, which has one set of input pins, one set of output pins, and one ground pin. N is a positive integer. The reserved installation area is provided with: N sets of input ports, each set of input ports including a positive port and a negative port, are used to transmit differential signals to the N sets of input pins; N sets of output ports, each set of output ports including a positive port and a negative port, are used to receive differential signals from the N sets of output pins; The first connection terminal is used to connect with the center tap pin when the integrated plug-in packaged transformer is installed in the reserved installation area; The second connection terminal is used to connect to the N grounding pins when installing the discrete surface-mount transformer in the reserved installation area. The system includes N sets of internal reserved connection lines, including N sets of input segment connection lines, N sets of intermediate segment connection lines, and N sets of output segment connection lines. The N sets of input segment connection lines are connected to the N sets of input ports. The N sets of input segment connection lines and the N sets of intermediate segment connection lines are used to connect the capacitors. The N sets of intermediate segment connection lines and the N sets of output segment connection lines are used to connect the transformer units. The N sets of output segment connection lines are connected to the N sets of output ports.

2. The PCB board according to claim 1, characterized in that: When the PCB board is used for 100 Mbps network transmission, N is 2. The N sets of input ports and N sets of output ports are used to transmit two pairs of differential signals. The N sets of input segment connection lines, N sets of intermediate segment connection lines and N sets of output segment connection lines are arranged in two sets for connecting the installed discrete surface mount transformer.

3. The PCB board according to claim 1, characterized in that: When the PCB board is used for gigabit network transmission, N is 4. The N sets of input ports and N sets of output ports are used to transmit four pairs of differential signals. The N sets of input segment connection lines, N sets of intermediate segment connection lines and N sets of output segment connection lines are arranged in four sets to connect the installed discrete surface mount transformer.

4. The PCB board according to claim 1, characterized in that, The N input ports are electrically connected to the PHY chip at the end furthest from the reserved installation area, and the N output ports are electrically connected to the RJ45 network interface at the end furthest from the reserved installation area.

5. The PCB board according to claim 4, characterized in that, When the PHY chip is driven by current, the first connection terminal is connected in series with the Smith circuit and then grounded. The Smith circuit includes a resistor and a capacitor connected in series.

6. The PCB board according to claim 4, characterized in that, When the PHY chip is driven by voltage, the first connection terminal is connected to the operating power supply of the PHY chip.

7. The PCB board according to claim 1, characterized in that, The second connection terminal is directly grounded.

8. The PCB board according to claim 1, characterized in that, The second connection terminal is connected in series with a 0Ω resistor and then grounded.

9. The PCB board according to claim 4, characterized in that, The PCB board also includes N bidirectional protection diodes. When the integrated plug-in packaged transformer is installed, each bidirectional protection diode is connected in series between the positive and negative terminals of each input port.

10. An Ethernet interface device, characterized in that, Including the PCB board as described in any one of claims 1-9.

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