CN210775742U - Off-line testing device for board-mounted RJ45 signal - Google Patents
Off-line testing device for board-mounted RJ45 signal Download PDFInfo
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- CN210775742U CN210775742U CN201921295824.0U CN201921295824U CN210775742U CN 210775742 U CN210775742 U CN 210775742U CN 201921295824 U CN201921295824 U CN 201921295824U CN 210775742 U CN210775742 U CN 210775742U
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Abstract
The utility model provides an off-line testing arrangement of board-mounted RJ45 signal, include: the RJ45 plug is connected with the RJ45 socket, the RJ45 plug comprises a plurality of pairs of differential lines, each pair of differential lines comprises a first differential line and a second differential line, and each pair of differential lines is connected with the input end of the corresponding offline test circuit; each offline test circuit comprises a first offline test circuit and a second offline test circuit, the first offline test circuit is connected with the first differential circuit, and the second offline test circuit is connected with the second differential circuit, so that on one hand, offline tests can be supported, onboard RJ45 signals can be detected offline, and the detection convenience is improved; on the other hand, the failed differential signal pair can be positioned, the cause of the problem is conveniently tracked, and the testing efficiency is improved.
Description
Technical Field
The utility model belongs to the technical field of the test design and specifically relates to an off-line testing arrangement of board-mounted RJ45 signal is related to.
Background
The server product needs to go through a plurality of links from design to practical application. Wherein PCBA
(printed circuit board assembly) is tested to ensure compliance with the design and functional implementation. In a server circuit board, especially a motherboard, a network interface is usually designed, and the actually used network interface is usually an RJ45 connector. The network rate of the current server mainboard design is generally kilomega network, and signals are transmitted through eight signal lines in total of four pairs. Detecting whether all signals of RJ45 are normal is a key step to ensure that network data transmission of the system is normal. The main reasons are that: if there is a problem with one signal line, the network rate drops to hundreds of megabits.
The conventional method for testing whether the RJ45 connector signal meets the design requirement is generally to connect to a tester through a power-on plug wire to detect whether the signal meets the requirement, as shown in fig. 1, specifically includes: power supply, net twine, test machine. In practical application, a network cable is used for connecting an RJ45 interface of a mainboard and a network port of a tester, and after the mainboard is powered up by a power supply, whether the state of a network signal meets the design requirement or not is checked through one side of the tester.
However, this testing method needs to test the RJ45 signal on line, and if the signal does not meet the design requirement, it is impossible to deeply discriminate the specific abnormal link, which is not favorable for improving the testing efficiency.
Disclosure of Invention
The utility model provides an off-line testing device for board-mounted RJ45 signals, which is used for solving the problems in the prior art, and has the advantages of simple and convenient use, off-line testing support, off-line detection of board-mounted RJ45 signals, and improvement of the convenience of detection; on the other hand, the failed differential signal pair can be positioned, the cause of the problem is conveniently tracked, and the testing efficiency is improved.
An aspect of the utility model provides an off-line testing arrangement of board-borne RJ45 signal is connected with RJ45 socket one end, the RJ45 socket other end is connected with network transformer, include: the RJ45 plug is connected with the RJ45 socket, the RJ45 plug comprises a plurality of pairs of differential lines, each pair of differential lines comprises a first differential line and a second differential line, and each pair of differential lines is connected with the input end of the offline test circuit; each off-line test circuit comprises a first off-line test circuit and a second off-line test circuit, the first off-line test circuit is connected with the first differential circuit, and the second off-line test circuit is connected with the second differential circuit.
In combination with the aspect, in a first possible implementation manner of the aspect, the first offline test circuit includes a comparison module, one path of a first input end of the comparison module is connected to the first differential line, the other path of the first input end of the comparison module is connected to the power VCC through a pull-up resistor R3, a second input end of the comparison module is connected to the power VCC through a voltage division module, an output end of the comparison module is connected to one end of the light emitting diode, and the other end of the light emitting diode is grounded; one end of the second off-line test circuit is connected with the second differential circuit, and the other end of the second off-line test circuit is grounded.
Further, the voltage dividing module includes a first voltage dividing resistor R1 and a second voltage dividing resistor R2, one end of the first voltage dividing resistor R1 is connected to the power VCC, one end of the other end of the first voltage dividing resistor R1 is connected to one end of the second voltage dividing resistor R2, the other end of the first voltage dividing resistor R2 is connected to the second input end of the comparing module, and the other end of the second voltage dividing resistor R2 is grounded.
Further, the comparison module includes a voltage comparator, the first input terminal is a positive input terminal of the voltage comparator, and the second input terminal is a negative input terminal of the voltage comparator.
In combination with this aspect, in a second possible implementation manner of this aspect, the power source VCC is powered by a battery.
In combination with this aspect, in a third possible implementation manner of this aspect, the first offline test circuit further includes a current limiting module, where one end of the current limiting module is connected to the output end of the comparing module, and the other end of the current limiting module is connected to one end of the light emitting diode.
Further, the current-limiting module includes first current-limiting resistor R4 and second current-limiting resistor R5, first current-limiting resistor R4's one end is connected with power VCC, and the output of comparison module is connected all the way to the other end, and the one end of second current-limiting resistor R5 is connected to another way, the other end and the one end of emitting diode of second current-limiting resistor R5 are connected.
The utility model discloses a technical scheme include following technological effect:
the utility model provides an off-line testing device of board-mounted RJ45 signal, which is convenient to use, can support off-line testing on one hand, can off-line detect board-mounted RJ45 signal, and improves the convenience of detection; on the other hand, the failed differential signal pair can be positioned, the cause of the problem is conveniently tracked, and the testing efficiency is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
For a clear explanation of the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for a person skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an on-line testing apparatus in the prior art;
fig. 2 is a schematic structural diagram of an apparatus according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a connection between one pair of differential lines and an off-line test circuit corresponding to the differential lines according to an embodiment of the present invention.
Detailed Description
In order to clearly illustrate the technical features of the present invention, the present invention is explained in detail by the following embodiments in combination with the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted so as to not unnecessarily limit the invention.
Example one
As shown in fig. 2, for the convenience of description, the utility model discloses technical scheme uses the RJ45 socket to include 4 to the differential circuit 8 way differential circuits that are promptly as an example and explains, the utility model discloses technical scheme provides an off-line testing arrangement 1 of board-borne RJ45 signal is connected with RJ45 socket 2 one end, and the RJ45 socket 2 other end is connected with network transformer 3, include: the RJ45 plug 11 and the 4 offline test circuits 12 are connected, the RJ45 plug 11 is connected to the RJ45 socket 2, the RJ45 plug 11 includes 4 pairs of differential lines 111, each pair of differential lines 111 includes a first differential line 1111 and a second differential line 1112, and each pair of differential lines 111 is correspondingly connected to the input end of the corresponding offline test circuit 12; each of the off-line test circuits 12 includes a first off-line test circuit 121 and a second off-line test circuit 122, the first off-line test circuit 121 is connected to the first differential line 1111, and the second off-line test circuit 122 is connected to the second differential line 1112.
As shown in fig. 3, taking one of the pair of differential lines 111 and the offline test circuit 12 corresponding to the pair of differential lines 111 as an example for description, the first offline test circuit 121 includes a comparison module 1211, a first input end of the comparison module 1211 is connected to the first differential line 1111, another input end of the comparison module 1211 is connected to the power source VCC1212 through a pull-up resistor R3, a second input end of the comparison module 1211 is connected to the power source VCC1212 through a voltage dividing module 1213, an output end of the comparison module 1211 is connected to one end of the light emitting diode 1214, and another end of the light emitting diode 1214 is grounded; the second offline test circuit 122 has one end connected to the second differential line 1112 and the other end grounded. The pull-up resistor R3 is mainly used to prevent the power supply VCC1212 from directly affecting the voltage comparator 12111 when the first differential line is open, and to perform a current limiting protection function, and the light emitting diode 1214 is a general chip LED (light emitting diode).
The voltage dividing module 1213 includes a first voltage dividing resistor R1 and a second voltage dividing resistor R2, one end of the first voltage dividing resistor R1 is connected to the power VCC1212, one end of the other end is connected to one end of the second voltage dividing resistor R2, the other end is connected to the second input terminal of the comparing module 1211, and the other end of the second voltage dividing resistor R2 is grounded.
The comparison module 1211 includes a voltage comparator 12111 having a first input terminal that is a positive input terminal of the voltage comparator 12111 and a second input terminal that is a negative input terminal of the voltage comparator 12111. Voltage comparator 12111 the utility model discloses a specific model is LM393, can also adopt the voltage comparator of other models of course, the utility model discloses do not do the restriction here. The operating voltage of the corresponding voltage comparator 12111 is 5V, and its power supply terminal is connected to the power supply VCC1212, and its ground terminal is grounded.
The utility model discloses well power VCC1212 adopts battery powered, does not do the restriction to the number of battery and the voltage of single battery, as long as can realize that the output voltage of power VCC reaches operating voltage (the utility model discloses in be 5V) can, simultaneously, to pull-up resistance R3, first divider resistance R1 and second divider resistance R2's resistance, the utility model discloses do not do the restriction, as long as can realize its function can, the preferred, pull-up resistance R3's resistance is 1K ohm, first divider resistance R1, second divider resistance R2 resistance are the same, are 1K ohm.
The specific working principle is explained by taking the example that the voltage of a power supply VCC is 5V, the resistance of a pull-up resistor R3 is 1K ohm, and the resistances of a first divider resistor R1 and a second divider resistor R2 are the same and are both 1K ohm: the signals of the RJ45 jacks 2 are connected to a network transformer 3, and each pair of differential line 111 signals form a pair of loops through the transformer windings. DP1 and DN1 form a pair of loops through the transformer windings, DP2 and DN2 form a pair of loops through the transformer windings, DP3 and DN3 form a pair of loops through the transformer windings, and DP4 and DN4 form a pair of loops through the transformer windings; when the off-line testing device 1 is connected to the RJ45 jack 2 through the RJ45 plug 11, each pair of differential line signals of the off-line testing device 1 forms a loop. If the signal circuit of the on-board RJ45 differential circuit is broken, the light emitting diodes corresponding to the pair of differential circuits are lighted. Specifically, taking one of the differential lines as an example, the voltage value input to the inverting input terminal is 2.5V through the voltage division of the first voltage dividing resistor R1 and the second voltage dividing resistor R2, when the first differential line 1111 signal DP1 and the second differential line 1112 signal DN1 are on, the forward input terminal of the voltage comparator 12111 is shorted to ground, i.e., the voltage is 0, the forward input voltage is less than 2.5V, so the output terminal of the voltage comparator 12111 outputs a low level, the right-side light emitting diode 1214 is not lit, when the first differential line 1111 signal DP1 and the second differential line 1112 signal DN1 are off, the forward input terminal of the voltage comparator 12111 is connected to the power source VCC1212 through the pull-up resistor R3, the forward input voltage is greater than 2.5V, the output terminal of the voltage comparator 12111 outputs a high level, and the right-side light emitting diode 1214 is lit. Therefore, when the onboard RJ45 signal is tested offline, if a pair of differential lines is disconnected, the light emitting diodes 1214 corresponding to the differential lines are lightened, so that the purposes of offline detecting whether the onboard RJ45 signal is connected and judging which differential line is disconnected are achieved.
The first offline test circuit 121 further includes a current limiting module 1215, wherein one end of the current limiting module 1215 is connected to the output terminal of the comparing module 1211, and the other end of the current limiting module 1215 is connected to one end of the led 1214.
The current limiting module 1215 includes a first current limiting resistor R4 and a second current limiting resistor R5, wherein one end of the first current limiting resistor R4 is connected to the power VCC1212, one end of the other end is connected to the output terminal of the comparing module 1211, the other end is connected to one end of the second current limiting resistor R5, and the other end of the second current limiting resistor R5 is connected to one end of the light emitting diode 1214.
It should be noted that, to the resistance of first current limiting resistor R4 and second voltage dividing resistor R5, the utility model discloses do not do the restriction, as long as can realize its function can, it is preferable that first current limiting resistor R4, second current limiting resistor R5 resistance are the same, are 1K ohm. The first current limiting resistor R4 mainly prevents the power source VCC1212 from affecting the led 1214, and the second current limiting resistor R5 mainly prevents the output of the voltage comparator 12111 from being high to affect the led 1214.
The utility model provides an off-line testing device of board-mounted RJ45 signal, which is convenient to use, can support off-line testing on one hand, can off-line detect board-mounted RJ45 signal, and improves the convenience of detection; on the other hand, the failed differential signal pair can be positioned, the reason of the problem is conveniently tracked, the testing efficiency is improved, and the failed differential signal pair can be visually judged by introducing the light emitting diode.
Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.
Claims (7)
1. The utility model provides an off-line testing arrangement of board-mounted RJ45 signal, is connected with RJ45 socket one end, the RJ45 socket other end is connected with the network transformer, characterized by includes: the RJ45 plug is connected with the RJ45 socket, the RJ45 plug comprises a plurality of pairs of differential lines, each pair of differential lines comprises a first differential line and a second differential line, and each pair of differential lines is connected with the input end of the corresponding offline test circuit; each off-line test circuit comprises a first off-line test circuit and a second off-line test circuit, the first off-line test circuit is connected with the first differential circuit, and the second off-line test circuit is connected with the second differential circuit.
2. The off-line testing device of an on-board RJ45 signal according to claim 1, wherein the first off-line testing circuit comprises a comparison module, one input terminal of the comparison module is connected to the first differential circuit, the other input terminal of the comparison module is connected to a power VCC through a pull-up resistor R3, the second input terminal of the comparison module is connected to the power VCC through a voltage dividing module, the output terminal of the comparison module is connected to one end of a light emitting diode, and the other end of the light emitting diode is grounded; one end of the second off-line test circuit is connected with the second differential circuit, and the other end of the second off-line test circuit is grounded.
3. The off-line testing device for the RJ45 onboard signals according to claim 2, wherein the voltage dividing module comprises a first voltage dividing resistor R1 and a second voltage dividing resistor R2, one end of the first voltage dividing resistor R1 is connected with a power supply VCC, one end of the other end of the first voltage dividing resistor R1 is connected with one end of the second voltage dividing resistor R2, the other end of the first voltage dividing resistor R1 is connected with a second input end of the comparison module, and the other end of the second voltage dividing resistor R2 is grounded.
4. The apparatus of claim 3, wherein the comparison module comprises a voltage comparator, the first input terminal is a positive input terminal of the voltage comparator, and the second input terminal is a negative input terminal of the voltage comparator.
5. The device for off-line testing of on-board RJ45 signals of any one of claims 2-4, wherein the power source VCC is battery powered.
6. The device for off-line testing of an on-board RJ45 signal according to any one of claims 2-4, wherein the first off-line testing circuit further comprises a current limiting module, one end of the current limiting module is connected to the output terminal of the comparison module, and the other end of the current limiting module is connected to one end of the light emitting diode.
7. The off-line testing device for the RJ45 onboard according to claim 6, wherein the current limiting module comprises a first current limiting resistor R4 and a second current limiting resistor R5, one end of the first current limiting resistor R4 is connected to a power supply VCC, the other end of the first current limiting resistor R4 is connected to one end of the comparison module, the other end of the first current limiting resistor R4 is connected to one end of a second current limiting resistor R5, and the other end of the second current limiting resistor R5 is connected to one end of a light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921295824.0U CN210775742U (en) | 2019-08-12 | 2019-08-12 | Off-line testing device for board-mounted RJ45 signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921295824.0U CN210775742U (en) | 2019-08-12 | 2019-08-12 | Off-line testing device for board-mounted RJ45 signal |
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| Publication Number | Publication Date |
|---|---|
| CN210775742U true CN210775742U (en) | 2020-06-16 |
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| CN201921295824.0U Active CN210775742U (en) | 2019-08-12 | 2019-08-12 | Off-line testing device for board-mounted RJ45 signal |
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- 2019-08-12 CN CN201921295824.0U patent/CN210775742U/en active Active
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