Ethernet consistency test fixture system capable of isolating POE voltage

Abstract

The utility model relates to an Ethernet consistency test fixture system for realizing POE voltage isolation, which comprises a first LAN port, a second LAN port, a network transformer TT1, a POE Load P1, a first filter capacitor C1, a second filter capacitor C2, a third filter capacitor C3 and a fourth filter capacitor C4, one end of the network transformer TT1 is connected with the first LAN port, the other end of the network transformer TT1 is connected with the second LAN port, and the other end of the network transformer TT1 is connected with the POE Load P1. The first LAN port is connected with a network port of a tested sample, the POE Load P1 is connected with a 54V power supply of the network port of the tested sample, T1, T3, T6 and T9 pins of the network transformer TT1 are grounded through filter capacitors C1, C2, C3 and C4, and the second LAN port is connected with an oscilloscope. The Ethernet consistency test fixture system capable of isolating the POE voltage can effectively protect equipment, has the advantages of fewer devices, simple circuit and simple and low manufacturing cost, can be reused in the product design verification stage, and can improve the research and development test efficiency.

Description

Technical Field

[0001] The utility model relates to the field of Ethernet interfaces, especially to the field of XXX Ethernet compliance testing, and specifically refers to an Ethernet compliance testing fixture system for isolating POE voltage. Background Art

[0002] With the development of society and the increasing maturity of POE technology, more and more products combining POE with Ethernet power supply are emerging. Currently, in the R & D stage of most electronic products with Ethernet interfaces in the industry, Ethernet compliance testing is required. And currently, many Ethernet interfaces have POE functions, such as POE switches, POE injectors, etc. When testing the Ethernet compliance of these products, there may be a 54V POE voltage on the four pairs of twisted pairs of their network interfaces. If directly connected to the oscilloscope channel through an unprotected network interface testing fixture, it is very easy to directly pour the 54V voltage into the oscilloscope channel, causing equipment damage.

[0003] Currently, generally, the POE function is turned off through software, or the 54V power supply is disconnected hardware, and then the 12V power supply is connected. This method is quite dependent on the integrity of the software, and it is easy to damage the sample when reworking the board - end power supply, which is time - consuming and laborious. If we can first isolate the potential 54V high - voltage risk through a simple testing fixture when the Ethernet interface of the sample comes out, we can directly measure the Ethernet interface of the test sample, and without involving too many cumbersome steps, we can more quickly and reasonably complete our product verification in the R & D and testing stage.

[0004] In today's electronic products, Ethernet compliance testing for devices with Ethernet interfaces in the R & D stage is essential. Especially for some large - scale industrial - grade switches and other network communication products, they generally have numerous network interfaces and most of them integrate POE power - supply technology. This makes us face the problem of a 54V voltage on the network interfaces when conducting Ethernet compliance testing on these network interfaces. We need to find a way to isolate this 54V from our test oscilloscope. The existing testing methods are to turn off the POE function through software, or disconnect the 54V power supply hardware and then connect the 12V power supply for testing. In this way, it can indeed ensure that the 54V is disconnected, but these methods are quite dependent on software support and changes to the single - board hardware. Each time a test sample is changed, it needs to be re - modified, with cumbersome steps, time - consuming and laborious, and it is easy to damage the sample. In this case, if there is a fixture that can isolate the voltage between the DUT (Device Under Test) and the test oscilloscope, which is plug - and - play and can isolate immediately without having to perform too many operations on the DUT, it will be very feasible and effective.

[0005] When testing Ethernet compliance currently, if the network port of the device under test has a 54V voltage POE function and is directly connected to the oscilloscope channel through an unprotected network port test fixture, the 54V voltage will be directly injected into the oscilloscope channel, easily damaging the channel. Summary of the Invention

[0006] The purpose of the present invention is to overcome the above-mentioned disadvantages of the prior art and provide an Ethernet compliance test fixture system for isolating POE voltage that meets the requirements of low cost, low risk, convenient operation, and wide application range.

[0007] To achieve the above purpose, the Ethernet compliance test fixture system for isolating POE voltage of the present invention is as follows:

[0008] The Ethernet compliance test fixture system for isolating POE voltage mainly includes a first LAN port, a second LAN port, a network transformer TT1, a POE Load P1, a first filter capacitor C1, a second filter capacitor C2, a third filter capacitor C3, and a fourth filter capacitor C4. One end of the network transformer TT1 is connected to the first LAN port, and the other end is connected to the second LAN port. The first LAN port is connected to the network port of the device under test. The POE Load P1 is connected to the 54V power supply of the network port of the device under test. The T1 pin of the network transformer TT1 is grounded through the first filter capacitor C1. The T3 pin of the network transformer TT1 is grounded through the second filter capacitor C2. The T6 pin of the network transformer TT1 is grounded through the third filter capacitor C3. The T9 pin of the network transformer TT1 is grounded through the fourth filter capacitor C4. The second LAN port is connected to the oscilloscope.

[0009] Preferably, the first pin of the first LAN port is connected to the M2 pin of the network transformer TT1, the second pin of the first LAN port is connected to the M3 pin of the network transformer TT1, the third pin of the first LAN port is connected to the M5 pin of the network transformer TT1, the fourth pin of the first LAN port is connected to the M6 pin of the network transformer TT1, the fifth pin of the first LAN port is connected to the M8 pin of the network transformer TT1, the sixth pin of the first LAN port is connected to the M9 pin of the network transformer TT1, the seventh pin of the first LAN port is connected to the M11 pin of the network transformer TT1, and the eighth pin of the first LAN port is connected to the M12 pin of the network transformer TT1.

[0010] Preferably, the M4 and M10 pins of the network transformer TT1 are connected to the 48V pin of the POE Load P1, the M1 and M7 pins of the network transformer TT1 are connected to the PGND pin of the POE Load P1, the T1 pin of the network transformer TT1 is connected in series with the first filter capacitor C1 and then connected to GND, the T4 pin of the network transformer TT1 is connected in series with the second filter capacitor C2 and then connected to GND, the T7 pin of the network transformer TT1 is connected in series with the third filter capacitor C3 and then connected to GND, and the T10 pin of the network transformer TT1 is connected in series with the fourth filter capacitor C4 and then connected to GND.

[0011] Preferably, the first pin of the second LAN port is connected to the T2 pin of the network transformer TT1, the second pin of the second LAN port is connected to the T3 pin of the network transformer TT1, the third pin of the second LAN port is connected to the T5 pin of the network transformer TT1, the fourth pin of the second LAN port is connected to the T6 pin of the network transformer TT1, the fifth pin of the second LAN port is connected to the T8 pin of the network transformer TT1, the sixth pin of the second LAN port is connected to the T9 pin of the network transformer TT1, the seventh pin of the second LAN port is connected to the T11 pin of the network transformer TT1, and the eighth pin of the second LAN port is connected to the T12 pin of the network transformer TT1.

[0012] Preferably, the capacitance values of the first filter capacitor C1, the second filter capacitor C2, the third filter capacitor C3, and the fourth filter capacitor C4 are all 10uF.

[0013] The Ethernet compliance test fixture system for implementing isolated POE voltage of the present invention is used to solve the problem of isolating 54V from the oscilloscope channel, replacing the cumbersome process of isolating the POE power supply of the Ethernet port before each test, effectively protecting the device, with fewer components, simple circuit, and low manufacturing cost, and can be reused in the product design verification stage, improving the efficiency of R & D testing. Description of the Drawings

[0014] Figure 1 It is a schematic circuit diagram of the Ethernet compliance test fixture system for implementing isolated POE voltage of the present invention. Detailed Embodiments

[0015] In order to more clearly describe the technical content of the present invention, the following will be further described in combination with specific embodiments.

[0016] The Ethernet compliance test fixture system for isolating POE voltage of the present utility model includes a first LAN port, a second LAN port, a network transformer TT1, a POE Load P1, a first filter capacitor C1, a second filter capacitor C2, a third filter capacitor C3, and a fourth filter capacitor C4. One end of the network transformer TT1 is connected to the first LAN port, and the other end is connected to the second LAN port. The first LAN port is connected to the network port of the device under test. The POE Load P1 is connected to the 54V power supply of the network port of the device under test. The T1 pin of the network transformer TT1 is grounded through the first filter capacitor C1. The T3 pin of the network transformer TT1 is grounded through the second filter capacitor C2. The T6 pin of the network transformer TT1 is grounded through the third filter capacitor C3. The T9 pin of the network transformer TT1 is grounded through the fourth filter capacitor C4. The second LAN port is connected to an oscilloscope.

[0017] As a preferred embodiment of the present utility model, the first pin of the first LAN port is connected to the M2 pin of the network transformer TT1. The second pin of the first LAN port is connected to the M3 pin of the network transformer TT1. The third pin of the first LAN port is connected to the M5 pin of the network transformer TT1. The fourth pin of the first LAN port is connected to the M6 pin of the network transformer TT1. The fifth pin of the first LAN port is connected to the M8 pin of the network transformer TT1. The sixth pin of the first LAN port is connected to the M9 pin of the network transformer TT1. The seventh pin of the first LAN port is connected to the M11 pin of the network transformer TT1. The eighth pin of the first LAN port is connected to the M12 pin of the network transformer TT1.

[0018] As a preferred embodiment of the present utility model, the M4 pin and M10 pin of the network transformer TT1 are connected to the 48V pin of the POE Load P1. The M1 pin and M7 pin of the network transformer TT1 are connected to the PGND pin of the POE Load P1. The T1 pin of the network transformer TT1 is connected in series with the first filter capacitor C1 and then connected to GND. The T4 pin of the network transformer TT1 is connected in series with the second filter capacitor C2 and then connected to GND. The T7 pin of the network transformer TT1 is connected in series with the third filter capacitor C3 and then connected to GND. The T10 pin of the network transformer TT1 is connected in series with the fourth filter capacitor C4 and then connected to GND.

[0019] As a preferred embodiment of the present utility model, the first pin of the second LAN port is connected to the T2 pin of the network transformer TT1, the second pin of the second LAN port is connected to the T3 pin of the network transformer TT1, the third pin of the second LAN port is connected to the T5 pin of the network transformer TT1, the fourth pin of the second LAN port is connected to the T6 pin of the network transformer TT1, the fifth pin of the second LAN port is connected to the T8 pin of the network transformer TT1, the sixth pin of the second LAN port is connected to the T9 pin of the network transformer TT1, the seventh pin of the second LAN port is connected to the T11 pin of the network transformer TT1, and the eighth pin of the second LAN port is connected to the T12 pin of the network transformer TT1.

[0020] As a preferred embodiment of the present utility model, the capacitance values of the first filter capacitor C1, the second filter capacitor C2, the third filter capacitor C3, and the fourth filter capacitor C4 are all 10 uF.

[0021] In a specific embodiment of the present utility model, an Ethernet compliance test fixture for isolating POE voltage is disclosed, which includes a first LAN port, a second LAN port, a network transformer TT1, a POE Load P1, and filter capacitors C1, C2, C3, C4; the first LAN port on the right side of the fixture is connected to the network port of the device under test.

[0022] The network port of the sample has a 54V POE output function. Through the isolation of the internal wiring and the transformer TT1, the 54V power supply is distributed to the POE Load P1. At the same time, after the four pairs of differential signals are conducted through the 1:1 transformer and the common mode inductor inside the transformer TT1, they go out from the pins at the other end of the network transformer TT1 and are correspondingly connected to the second LAN port on the left. The corresponding T1, T3, T6, and T9 pins are connected to GND through the filter capacitors C1, C2, C3, and C4. The second LAN port on the left is directly connected to the fixture for testing the Ethernet compliance of the oscilloscope for testing, so as to isolate the 54V POE power supply of the device under test from the oscilloscope.

[0023] As Figure 1 As shown, the present utility model discloses an Ethernet compliance test fixture for isolating POE voltage, which includes a first LAN port, a second LAN port, a network transformer TT1 (the T1SB01RV transformer of Bohan can be used here), a POE Load P1, and filter capacitors C1, C2, C3, C4.

[0024] First, turn on the oscilloscope and let it warm up. Then, connect the conventional Ethernet test fixture. Power on the sample under test to fully start it. The Ethernet port of this sample has a 54V POE output function. Connect the Ethernet port of the sample under test to the first LAN port on the right side of the test fixture. Both the first LAN port and the second LAN port are RJ45 standard connectors.

[0025] The first pin of the first LAN port is connected to the M2 pin of the network transformer TT1. The second pin of the first LAN port is connected to the M3 pin of the network transformer TT1. The third pin of the first LAN port is connected to the M5 pin of the network transformer TT1. The fourth pin of the first LAN port is connected to the M6 pin of the network transformer TT1. The fifth pin of the first LAN port is connected to the M8 pin of the network transformer TT1. The sixth pin of the first LAN port is connected to the M9 pin of the network transformer TT1. The seventh pin of the first LAN port is connected to the M11 pin of the network transformer TT1. The eighth pin of the first LAN port is connected to the M12 pin of the network transformer TT1.

[0026] The M4 pin and M10 pin of the network transformer TT1 are connected to the 48V pin of the POE Load P1. The M1 pin and M7 pin of the network transformer TT1 are connected to the PGND pin of the POE Load P1. The T1 pin of the network transformer TT1 is connected in series with the first filter capacitor C1 and then connected to GND. The T4 pin of the network transformer TT1 is connected in series with the second filter capacitor C2 and then connected to GND. The T7 pin of the network transformer TT1 is connected in series with the third filter capacitor C3 and then connected to GND. The T10 pin of the network transformer TT1 is connected in series with the fourth filter capacitor C4 and then connected to GND. The capacitance values of C1 to C4 are 10uF. The first pin of the second LAN port is connected to the T2 pin of the network transformer TT1. The second pin of the second LAN port is connected to the T3 pin of the network transformer TT1. The third pin of the second LAN port is connected to the T5 pin of the network transformer TT1. The fourth pin of the second LAN port is connected to the T6 pin of the network transformer TT1. The fifth pin of the second LAN port is connected to the T8 pin of the network transformer TT1. The sixth pin of the second LAN port is connected to the T9 pin of the network transformer TT1. The seventh pin of the second LAN port is connected to the T11 pin of the network transformer TT1. The eighth pin of the second LAN port is connected to the T12 pin of the network transformer TT1.

[0027] TT1 is a fixed network transformer TT1. Here, the T1SB01RV transformer of Bohan can be used. The simplest POE cement load can be used for POE Load P1. C1 to C4 are filter capacitors with capacitance values of 10uF.

[0028] When using this fixture for testing, the first LAN port is connected to the network port of the device under test, and the other end, the second LAN port, is connected to the Ethernet compliance test fixture. When a signal is sent from the first LAN port, the 54V POE voltage on each wire pair will pass through the center tap of a 1:1 transformer and be connected to the positive and negative poles of POE Load P1 through M1, M4, M7, and M10 of the TT1 transformer to power up the load and make it work. At the same time, the data signal part of the first LAN port is coupled to the other side through the coil of the 1:1 transformer and then undergoes further transmission after passing through the common-mode inductor. Meanwhile, the wire pairs of the second LAN port are correspondingly connected to the other pins of TT1. In this way, while isolating the 54V POE voltage, signal transmission can be carried out.

[0029] It is used to replace the cumbersome process of isolating the POE power supply of the Ethernet port before each test, can effectively protect the device, has fewer components, a simple circuit, and a low manufacturing cost. It can be reused during the product design verification stage, which can improve the efficiency of R & D testing.

[0030] In this utility model, the first LAN port is connected to the network port of the device under test, and the other end, the second LAN port, is connected to the Ethernet compliance test fixture. When a signal is sent from the first LAN port, the 54V POE voltage is blocked on one side by the TT1 transformer in the fixture and connected to the PI load for use, while the data signal part can be coupled to the other side through the 1:1 transformer for transmission and is correspondingly connected to the second LAN port on the other side, achieving the function of isolating the 54V POE voltage and enabling data signal transmission. The verification method of this fixture is used for testing the Ethernet compliance with POE power supply and provides a solution with low cost, low risk, and convenient operation.

[0031] For the specific implementation solution of this embodiment, reference can be made to the relevant descriptions in the above embodiments, which will not be elaborated here.

[0032] It can be understood that the same or similar parts in the above embodiments can be referred to each other, and the content not detailed in some embodiments can be referred to the same or similar content in other embodiments.

[0033] It should be noted that in the description of this utility model, terms such as "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this utility model, unless otherwise specified, the meaning of "a plurality of" refers to at least two.

[0034] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0035] The Ethernet compliance test fixture system for isolating POE voltage adopting the present utility model is used to solve the problem of isolating the 54V from the oscilloscope channel, and is used to replace the cumbersome process of isolating the POE power supply of the Ethernet port before each test. It can effectively protect the device, and has fewer components, simple circuits, and low manufacturing costs. It can be reused in the product design verification stage, and can improve the efficiency of R & D testing.

[0036] In this specification, the present utility model has been described with reference to its specific embodiments. However, it is obvious that various modifications and transformations can still be made without departing from the spirit and scope of the present utility model. Therefore, the specification and the drawings should be regarded as illustrative rather than restrictive.

Claims

1. An Ethernet compliance test fixture system for implementing isolated POE voltage, characterized in that, The system includes a first LAN port, a second LAN port, a network transformer TT1, a POE Load P1, a first filter capacitor C1, a second filter capacitor C2, a third filter capacitor C3, and a fourth filter capacitor C4. One end of the network transformer TT1 is connected to the first LAN port, and the other end is connected to the second LAN port. The first LAN port is connected to the network port of the device under test. The POE Load P1 is connected to the 54V power supply of the network port of the device under test. The T1 pin of the network transformer TT1 is grounded through the first filter capacitor C1. The T3 pin of the network transformer TT1 is grounded through the second filter capacitor C2. The T6 pin of the network transformer TT1 is grounded through the third filter capacitor C3. The T9 pin of the network transformer TT1 is grounded through the fourth filter capacitor C4. The second LAN port is connected to an oscilloscope.

2. The Ethernet compliance test fixture system for implementing isolated POE voltage according to claim 1, wherein The first pin of the first LAN port is connected to the M2 pin of the network transformer TT1. The second pin of the first LAN port is connected to the M3 pin of the network transformer TT1. The third pin of the first LAN port is connected to the M5 pin of the network transformer TT1. The fourth pin of the first LAN port is connected to the M6 pin of the network transformer TT1. The fifth pin of the first LAN port is connected to the M8 pin of the network transformer TT1. The sixth pin of the first LAN port is connected to the M9 pin of the network transformer TT1. The seventh pin of the first LAN port is connected to the M11 pin of the network transformer TT1. The eighth pin of the first LAN port is connected to the M12 pin of the network transformer TT1.

3. The Ethernet compliance test fixture system for implementing isolated POE voltage according to claim 1, characterized in that The M4 pin and M10 pin of the network transformer TT1 are connected to the 48V pin of the POE Load P1. The M1 pin and M7 pin of the network transformer TT1 are connected to the PGND pin of the POE Load P1. The T1 pin of the network transformer TT1 is connected in series with the first filter capacitor C1 and then connected to GND. The T4 pin of the network transformer TT1 is connected in series with the second filter capacitor C2 and then connected to GND. The T7 pin of the network transformer TT1 is connected in series with the third filter capacitor C3 and then connected to GND. The T10 pin of the network transformer TT1 is connected in series with the fourth filter capacitor C4 and then connected to GND.

4. The Ethernet compliance test fixture system for implementing isolated POE voltage according to claim 1, wherein The first pin of the second LAN port is connected to the T2 pin of the network transformer TT1. The second pin of the second LAN port is connected to the T3 pin of the network transformer TT1. The third pin of the second LAN port is connected to the T5 pin of the network transformer TT1. The fourth pin of the second LAN port is connected to the T6 pin of the network transformer TT1. The fifth pin of the second LAN port is connected to the T8 pin of the network transformer TT1. The sixth pin of the second LAN port is connected to the T9 pin of the network transformer TT1. The seventh pin of the second LAN port is connected to the T11 pin of the network transformer TT1. The eighth pin of the second LAN port is connected to the T12 pin of the network transformer TT1.

5. The Ethernet compliance test fixture system for implementing isolated POE voltage according to claim 1, wherein The capacitance values of the first filter capacitor C1, the second filter capacitor C2, the third filter capacitor C3, and the fourth filter capacitor C4 are all 10 uF.

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