CN110795379A - Double-layer network port electromagnetic compatibility circuit and server - Google Patents
Double-layer network port electromagnetic compatibility circuit and server Download PDFInfo
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- CN110795379A CN110795379A CN201910969432.6A CN201910969432A CN110795379A CN 110795379 A CN110795379 A CN 110795379A CN 201910969432 A CN201910969432 A CN 201910969432A CN 110795379 A CN110795379 A CN 110795379A
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- 239000010410 layer Substances 0.000 claims description 28
- 239000002355 dual-layer Substances 0.000 claims description 17
- 238000002955 isolation Methods 0.000 claims description 15
- 239000003990 capacitor Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000010923 batch production Methods 0.000 abstract description 5
- 230000008054 signal transmission Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000004804 winding Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 239000004020 conductor Substances 0.000 description 5
- 230000005670 electromagnetic radiation Effects 0.000 description 5
- 230000005404 monopole Effects 0.000 description 5
- 230000003071 parasitic effect Effects 0.000 description 5
- 230000005855 radiation Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000001012 protector Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011076 safety test Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
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- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
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Abstract
The invention discloses a double-layer network port electromagnetic compatibility circuit, wherein two network ports on a server mainboard adopt the same structural design, thereby facilitating batch production, but different from the prior art, each network port only comprises a network port body for signal transmission, and an electromagnetic compatibility protection device is not integrated in the network port body (the network port is more convenient to manufacture) but arranged outside the network port body, thus the electromagnetic compatibility protection device can be independently added outside the network port body as a management network port, thereby not only meeting the electromagnetic compatibility index requirement of the management network port, but also saving a set of electromagnetic compatibility protection device and saving cost. The invention also discloses a server which has the same beneficial effect with the double-layer network port electromagnetic compatibility circuit.
Description
Technical Field
The invention relates to the field of servers, in particular to a double-layer network port electromagnetic compatibility circuit and a server.
Background
At present, a server motherboard is usually provided with two network ports with an upper and lower structure, which are called as a dual-layer network port, one network port is used as a management network port, and the other network port is used as a serial port or a debug (debug) port. In order to facilitate mass production, the two network ports adopt the same structural design, namely each network port comprises a network port body for signal transmission and an electromagnetic compatibility protection device integrated in the network port body. However, the requirement of the electromagnetic compatibility index based on the management network port and the serial port (or the debugging port) is known, the requirement of the integrated electromagnetic compatibility protection device is in the management network port, and the requirement of the integrated electromagnetic compatibility protection device is not in the serial port (or the debugging port), so that the redundant arrangement of the integrated electromagnetic compatibility protection device in the network port serving as the serial port (or the debugging port) is caused, and the cost is wasted.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a double-layer internet access electromagnetic compatibility circuit and a server, which can be used for independently adding an electromagnetic compatibility protection device outside a internet access body used as a management internet access, thereby not only meeting the electromagnetic compatibility index requirement of the management internet access, but also saving a set of electromagnetic compatibility protection device and saving the cost.
In order to solve the above technical problem, the present invention provides a dual-layer network interface electromagnetic compatibility circuit, including:
the first internet access body is arranged on the server mainboard;
the second network port body is arranged on the server mainboard and has the same structure as the first network port body;
the electromagnetic compatibility protection device is arranged on a connecting line between the first internet access body and the server mainboard and used for meeting the electromagnetic compatibility index requirement of the first internet access body; wherein, the first internet access body is used as a management internet access.
Preferably, the first portal body and the second portal body are grounded, and the ground of the first portal body is not grounded with the ground of the server motherboard;
and the electromagnetic compatibility protection device comprises:
and the input positive end is connected with a signal wire of the first network port body, the input negative end is connected to the ground of the first network port body, the output positive end is connected with a signal wire of the server mainboard, and the output negative end is connected to the ground of the server mainboard.
Preferably, the distance between the ground of the first portal body and the ground of the server mainboard is at least 20 mils.
Preferably, the dual-layer network interface electromagnetic compatibility circuit further includes:
and the electrostatic protection device is arranged on a connecting line between the isolation transformer and the server mainboard.
Preferably, the dual-layer network interface electromagnetic compatibility circuit further includes:
the detachable capacitor is connected between the ground of the first internet access body and the ground of the server mainboard;
and the 0 ohm resistor is detachably connected between the ground of the first internet access body and the ground of the server mainboard.
Preferably, the 0 ohm resistance is at least two.
Preferably, the two network port bodies arranged on the server mainboard are of an upper network port structure and a lower network port structure; and the server case connected with the double-layer net mouth body is provided with a folding edge which is contacted with the upper side connecting elastic sheet of the upper layer net mouth body above the upper layer net mouth body.
In order to solve the above technical problem, the present invention further provides a server, including:
a server motherboard;
the server case is used for installing the server mainboard;
a double-layer network port electromagnetic compatibility circuit; the double-layer network port electromagnetic compatibility circuit adopts any one of the double-layer network port electromagnetic compatibility circuits.
The invention provides a double-layer network port electromagnetic compatibility circuit, two network ports on a server mainboard adopt the same structural design, thereby facilitating batch production, but different from the prior art, each network port only comprises a network port body used for signal transmission, an electromagnetic compatibility protection device is not integrated in the network port body (the network port is more convenient to manufacture) but arranged outside the network port body, and the electromagnetic compatibility protection device can be independently added outside the network port body used as a management network port in such a way, thereby not only meeting the electromagnetic compatibility index requirement of the management network port, but also saving a set of electromagnetic compatibility protection device and saving cost.
The invention also provides a server which has the same beneficial effect with the double-layer network port electromagnetic compatibility circuit.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a dual-layer network interface electromagnetic compatibility circuit according to an embodiment of the present invention;
fig. 2 is a schematic design diagram of a separated type network port according to an embodiment of the present invention;
fig. 3 is a structural diagram of a design of a dual-layer network port according to an embodiment of the present invention;
fig. 4(a) is a schematic diagram of a server chassis and a network port before modification according to an embodiment of the present invention;
fig. 4(b) is a schematic diagram of a contact between a modified server enclosure and a portal according to an embodiment of the present invention.
Detailed Description
The core of the invention is to provide a double-layer network port electromagnetic compatibility circuit and a server, which can be used for independently adding an electromagnetic compatibility protection device outside a network port body used as a management network port, thereby not only meeting the electromagnetic compatibility index requirement of the management network port, but also saving a set of electromagnetic compatibility protection device and saving the cost.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a dual-layer network interface electromagnetic compatibility circuit according to an embodiment of the present invention.
This double-deck net gape electromagnetic compatibility circuit includes:
the first internet access device comprises a first internet access body 1 arranged on a server mainboard;
the second network port body 2 is arranged on the server mainboard and has the same structure with the first network port body 1;
the electromagnetic compatibility protection device 3 is arranged on a connecting line between the first internet access body 1 and the server main board and is used for meeting the electromagnetic compatibility index requirement of the first internet access body 1; wherein, the first internet access body 1 is used as a management internet access.
Specifically, the double-layer net gape electromagnetic compatibility circuit of this application includes first net gape body 1, second net gape body 2 and electromagnetic compatibility protector 3, and its theory of operation is:
be equipped with two net gapes on the server mainboard, two net gapes's structure is the same, is convenient for carry out batch production. In two network ports on a server mainboard, one network port is frequently used as a management network port, and the other network port is not frequently used as a serial port (or a debugging port).
The electromagnetic compatibility index requirements of the management network port and the serial port (or debugging port) are different, the electromagnetic compatibility index requirements of the management network port are higher, and the electromagnetic compatibility index requirements can be met only by integrating an electromagnetic compatibility protection device in the management network port; and the electromagnetic compatibility index requirement of serial ports (or debugging ports) is lower, need not at serial ports (or debugging ports) internal integration electromagnetic compatibility protector, but prior art for the convenience of batch production all makes two net gapes on the server mainboard for the net gape that the internal integration has electromagnetic compatibility protector, leads to the net gape cost of manufacture higher.
Based on the above, the two network ports on the server mainboard are both made into the network ports only comprising the network port bodies for signal transmission, namely the network ports without the electromagnetic compatibility protection devices integrated therein, so that the mass production is facilitated, and the manufacturing cost of the network ports is reduced; meanwhile, the method considers that the management network port needs to meet the requirement of the electromagnetic compatibility index of the management network port before being connected to the circuit on the server mainboard, so that the electromagnetic compatibility protection device 3 is additionally arranged on the connecting circuit between the management network port and the server mainboard to meet the requirement of the electromagnetic compatibility index of the management network port, and the electromagnetic compatibility protection device 3 can be additionally arranged outside the network port body serving as the management network port independently in such a way, so that the requirement of the electromagnetic compatibility index of the management network port is met, and a set of electromagnetic compatibility protection device is saved; moreover, compared with the internet access integrated with the electromagnetic compatibility protection device, the separated design mode of the internet access and the electromagnetic compatibility protection device 3 has the following advantages: the electromagnetic compatibility protection device 3 is arranged outside the net port, and the space outside the net port relative to the space inside the net port is larger, so that the electromagnetic compatibility protection device 3 can be selected more selectively, and the design is convenient.
The invention provides a double-layer network port electromagnetic compatibility circuit, two network ports on a server mainboard adopt the same structural design, thereby facilitating batch production, but different from the prior art, each network port only comprises a network port body used for signal transmission, an electromagnetic compatibility protection device is not integrated in the network port body (the network port is more convenient to manufacture) but arranged outside the network port body, and the electromagnetic compatibility protection device can be independently added outside the network port body used as a management network port in such a way, thereby not only meeting the electromagnetic compatibility index requirement of the management network port, but also saving a set of electromagnetic compatibility protection device and saving cost.
On the basis of the above-described embodiment:
referring to fig. 2, fig. 2 is a schematic diagram of a design of a separated type network port according to an embodiment of the present invention.
As a preferred embodiment, the first portal body 1 and the second portal body 2 are in common, and the ground of the first portal body 1 is not in common with the ground of the server mainboard;
and the electromagnetic compatibility protection device 3 includes:
and the input positive end is connected with a signal line of the first network port body 1, the input negative end is connected with the ground of the first network port body 1, the output positive end is connected with a signal line of the server mainboard, and the output negative end is connected with the ground of the server mainboard.
Specifically, it is known that the occurrence of electromagnetic interference requires three conditions to be met simultaneously: 1) interference sources, i.e., circuits or devices that generate electromagnetic interference; 2) a coupled path, i.e. a path capable of transferring electromagnetic interference generated by an interference source to a sensitive source; 3) a sensitive source, i.e. a circuit or a device that is affected by electromagnetic interference. These three conditions are called three elements of electromagnetic interference, and the electromagnetic interference problem is solved by eliminating one of the three elements.
Therefore, the problem of electromagnetic interference (for example, interference energy is conducted to the server mainboard after the internet access is struck by lightning/is subjected to static electricity) possibly brought to the server mainboard by the internet access is solved by cutting off the coupling path, specifically, two internet access bodies on the server mainboard are grounded, the ground of the internet access bodies is not grounded with the ground of the server mainboard, namely, the ground of the internet access bodies and the ground of the server mainboard are arranged at intervals, and the intervals achieve the purpose of isolating the interference energy conduction.
In addition, the electromagnetic compatibility protection device 3 of the present application selects an isolation transformer, and an isolation circuit is also provided between the primary winding and the secondary winding of the isolation transformer, and meanwhile, considering that under the condition of higher frequency, the capacitance between the primary winding and the secondary winding of the isolation transformer still causes electrostatic interference between circuits on two sides, so in order to avoid the electrostatic interference, the primary winding and the secondary winding of the isolation transformer of the present application are respectively arranged on different core posts to reduce the capacitance between the primary winding and the secondary winding; or the primary winding and the secondary winding are concentrically arranged, but an electrostatic shield is additionally arranged between the two windings so as to obtain higher interference resistance. And the input end and the ground of the output end of the isolation transformer are divided, the input end of the isolation transformer is connected with the ground of the network port, and the output end of the isolation transformer is connected with the ground of the server mainboard, so that the separation of ground signals is realized.
As a preferred embodiment, the distance between the ground of the first portal body 1 and the ground of the server motherboard is at least 20 mils.
Specifically, in order to prevent the interference signal of the network port from passing through the ground of the network port to the ground of the server main board, the distance between the ground of the network port and the ground of the server main board is at least 20mil, and the interference signal can be prevented from being transmitted along the ground only when the distance is reached.
More specifically, the distance between the ground of the internet access and the ground of the server mainboard can be estimated according to the requirement of the anti-interference capacity between the server mainboard and the internet access, and when the requirement of the anti-interference capacity between the server mainboard and the internet access is higher, the anti-interference level needs to be improved by increasing the distance between the ground of the internet access and the ground of the server mainboard.
As a preferred embodiment, the dual-layer portal electromagnetic compatibility circuit further comprises:
and the electrostatic protection device is arranged on a connecting line between the isolation transformer and the server mainboard.
Further, the double-layer net mouth electromagnetic compatibility circuit of the application also comprises an electrostatic protection device, and the working principle is as follows:
in order to improve the electrostatic protection performance of the server mainboard, the electrostatic protection device can be additionally arranged on a connecting line between the first internet access body and the server mainboard. Considering the connection line from the first portal body to the server motherboard: first net gape body → isolation transformer → server mainboard, so this application can add the electrostatic protection device on the connecting wire between first net gape body and the isolation transformer, also can add the electrostatic protection device on the connecting wire between isolation transformer and the server mainboard, nevertheless consider when first net gape body department has stronger interfering signal to come, the electrostatic protection device can be damaged, so this application selects to add the electrostatic protection device on the connecting wire between isolation transformer and server mainboard, thereby not only improved the electrostatic protection performance of server mainboard, still protected the electrostatic protection device.
As a preferred embodiment, the dual-layer portal electromagnetic compatibility circuit further comprises:
the detachable capacitor is connected between the ground of the first internet access body 1 and the ground of the server mainboard;
and the 0 ohm resistor is detachably connected between the ground of the first net opening body 1 and the ground of the server main board.
Further, the double-layer net mouth electromagnetic compatibility circuit of this application still includes detachable electric capacity and 0 ohm resistance, and its theory of operation is:
considering that when the device is subjected to safety test, some tests need to connect the ground of the net port and the ground of the server main board, the capacitor and the 0 ohm resistor (such as C1, C2, R1 and R2 in the figure 2) are connected between the ground of the net port and the ground of the server main board, and the capacitor and the 0 ohm resistor are manufactured to be detachable in circuit, so that the device can be used under different conditions.
As a preferred embodiment, the 0 ohm resistance is at least two.
Specifically, the set number of 0 ohm resistors is required, and is at least 20 ohm resistors (the 0 ohm resistor packaged in 0805 can be selected), because when the equipment safety test is carried out, a grounding continuity test needs to be carried out, a 30A current needs to be added to a network port in the grounding continuity test, most of the current can be conducted away along with a chassis, a small part of the current can enter the ground of the network port, but if the resistor package between the ground of the network port and the ground of a server main board is too small, the current can still be burnt out, and therefore the equipment is damaged. Therefore, in the present application, at least 2 resistors of 0 ohm should be selected.
As a preferred embodiment, the two network port bodies arranged on the server mainboard are of an upper network port and a lower network port structure; and the server case connected with the double-layer net mouth body is provided with a folding edge contacted with the upper side connecting elastic sheet of the upper-layer net mouth body above the upper-layer net mouth body.
Specifically, the two network port bodies on the server motherboard of the present application are of an upper network port structure and a lower network port structure, as shown in fig. 3 (upper network port body B + lower network port body a). Referring to fig. 4(a), fig. 4(a) is a schematic view of a contact between a server chassis and a portal before improvement according to an embodiment of the present invention. In the prior art, a server mainboard is installed on a server case through a network port, and as can be seen from fig. 4(a), limited by the structure of the server case, the network port and the server case are only contacted with each other at the side of the server case, so that the contact between a connection elastic sheet of the network port and the server case is insufficient, that is, the lap joint between the network port and the server case is not good enough, and the following problems can be caused:
two requirements for electromagnetic wave radiation are the antenna and the alternating current flowing through the antenna, and the reason why the device generates the radiated interference is that various parasitic antennas are included in the device, and the problem of radiated electromagnetic interference can be improved as long as the parasitic antennas are eliminated, or the radiation efficiency of the parasitic antennas is reduced, or the alternating current is prevented from entering the parasitic antennas.
The parasitic antenna is divided into a dipole antenna and a monopole antenna, wherein the dipole antenna is essentially a voltage existing between two conductors; a variant of a dipole antenna is a monopole antenna in the form of only one conductor, the other conductor having the ground or other metal attached thereto serving as ground. Monopole antennas have substantially the same radiation characteristics as dipole antennas, but are less efficient.
It can be seen that for a dipole or monopole antenna, its radiation can be reduced by simply removing the voltage between the two conductors, or between the conductors and ground. Dipole and monopole antennas are not easily discovered because the voltage driving such antennas is not the operating voltage of the circuit, but some unintentional voltage, which is a common mode voltage that drives a common mode current that produces electromagnetic radiation. In order to eliminate the electromagnetic radiation, it is effective to connect the cable to the chassis, i.e. to ground, so that the good connection between the cable and the chassis plays a very important role in eliminating common mode voltage and electromagnetic radiation. The existing internet access and the server case are not well lapped, so that the effect of eliminating electromagnetic radiation is poor.
Based on this, the server machine case of this application is equipped with the hem that is connected the shell fragment contact with the upside of upper net gape body in the top of upper net gape body, as shown in fig. 4(b), can see out from fig. 4(b), the contact of net gape and server machine case is not only in the side of server machine case, still at the hem that the server machine case increases, leads to the connection shell fragment of net gape and the contact of server machine case abundant, and the overlap joint of net gape and server machine case is good promptly to the effect of eliminating electromagnetic radiation has been promoted.
The present invention also provides a server, comprising:
a server motherboard;
the server case is used for installing a server mainboard;
a double-layer network port electromagnetic compatibility circuit; the double-layer network port electromagnetic compatibility circuit adopts any one of the double-layer network port electromagnetic compatibility circuits.
For the introduction of the server provided by the present invention, please refer to the above-mentioned embodiment of the dual-layer network interface electromagnetic compatibility circuit, and the present invention is not described herein again.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A dual layer portal emc circuit, comprising:
the first internet access body is arranged on the server mainboard;
the second network port body is arranged on the server mainboard and has the same structure as the first network port body;
the electromagnetic compatibility protection device is arranged on a connecting line between the first internet access body and the server mainboard and used for meeting the electromagnetic compatibility index requirement of the first internet access body; wherein, the first internet access body is used as a management internet access.
2. The dual-layer portal electromagnetic compatibility circuit according to claim 1, wherein said first portal body and said second portal body are grounded, and a ground of said first portal body is not grounded with a ground of said server motherboard;
and the electromagnetic compatibility protection device comprises:
and the input positive end is connected with a signal wire of the first network port body, the input negative end is connected to the ground of the first network port body, the output positive end is connected with a signal wire of the server mainboard, and the output negative end is connected to the ground of the server mainboard.
3. The dual-layer portal emc circuit of claim 2, wherein a distance between a ground of the first portal body and a ground of the server motherboard is at least 20 mils.
4. The dual-layer portal emc circuit of claim 2, further comprising:
and the electrostatic protection device is arranged on a connecting line between the isolation transformer and the server mainboard.
5. The dual-layer portal emc circuit of claim 2, further comprising:
the detachable capacitor is connected between the ground of the first internet access body and the ground of the server mainboard;
and the 0 ohm resistor is detachably connected between the ground of the first internet access body and the ground of the server mainboard.
6. The dual layer portal emc circuit of claim 5, wherein said 0 ohm resistors are at least two.
7. The dual-layer network port electromagnetic compatibility circuit of any of claims 1-6, wherein the two network port bodies arranged on the server motherboard are of an upper network port and a lower network port structure; and the server case connected with the double-layer net mouth body is provided with a folding edge which is contacted with the upper side connecting elastic sheet of the upper layer net mouth body above the upper layer net mouth body.
8. A server, comprising:
a server motherboard;
the server case is used for installing the server mainboard;
a double-layer network port electromagnetic compatibility circuit; the double-layer network port electromagnetic compatibility circuit adopts the double-layer network port electromagnetic compatibility circuit as claimed in any one of claims 1 to 7.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910969432.6A CN110795379A (en) | 2019-10-12 | 2019-10-12 | Double-layer network port electromagnetic compatibility circuit and server |
| PCT/CN2019/121103 WO2021068375A1 (en) | 2019-10-12 | 2019-11-27 | Electromagnetic compatibility circuit having double-layer network port, and server |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910969432.6A CN110795379A (en) | 2019-10-12 | 2019-10-12 | Double-layer network port electromagnetic compatibility circuit and server |
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| CN110795379A true CN110795379A (en) | 2020-02-14 |
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| CN201910969432.6A Pending CN110795379A (en) | 2019-10-12 | 2019-10-12 | Double-layer network port electromagnetic compatibility circuit and server |
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| CN100349152C (en) * | 2004-07-08 | 2007-11-14 | 华为技术有限公司 | Interface device |
| US10027340B1 (en) * | 2012-12-31 | 2018-07-17 | Jefferson Science Associates, Llc | Method and apparatus to digitize pulse shapes from radiation detectors |
| CN107332675B (en) * | 2017-07-31 | 2023-05-02 | 博为科技有限公司 | PoE equipment without network transformer |
| CN208285002U (en) * | 2018-03-22 | 2018-12-25 | 深圳市韬略科技有限公司 | A kind of surge protection device |
| CN209201095U (en) * | 2019-01-16 | 2019-08-02 | 北京梦想加信息技术有限公司 | A kind of accessing wirelessly access device |
| CN210804409U (en) * | 2019-10-12 | 2020-06-19 | 广东浪潮大数据研究有限公司 | Double-layer network port electromagnetic compatibility circuit and server |
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