CN215452971U

CN215452971U - Clamp special for verifying gigabit Ethernet transformer signal

Info

Publication number: CN215452971U
Application number: CN202121084932.0U
Authority: CN
Inventors: 陈晨
Original assignee: Taicang T&W Electronics Co Ltd
Current assignee: Taicang T&W Electronics Co Ltd
Priority date: 2021-05-20
Filing date: 2021-05-20
Publication date: 2022-01-07
Anticipated expiration: 2031-05-20

Abstract

The utility model provides a clamp special for verifying gigabit Ethernet transformer signals, which relates to the field of gigabit Ethernet signal testing, and comprises a PCB (printed Circuit Board), wherein network interfaces (LAN 1 and LAN 2) are respectively arranged on two sides of the PCB, the LAN1 is a signal input interface, and the LAN2 is a signal output interface; a transformer seat is arranged on the surface of the PCB, a plurality of pairs of connecting terminals are respectively arranged on two sides of the transformer seat, and a transformer is arranged on the transformer seat; the connection terminal on one side is connected to the LAN1 through a plurality of pairs of first differential transmission lines, and the connection terminal on the other side is connected to the LAN2 through a plurality of pairs of second differential transmission lines; LAN1 is connected to the device under test's portal and LAN2 is connected to the oscilloscope. The utility model can carry out the signal verification of the four pairs of differential line pairs of the gigabit Ethernet transformer, thereby verifying whether the gigabit Ethernet port can normally work or not.

Description

Clamp special for verifying gigabit Ethernet transformer signal

Technical Field

The utility model relates to the field of gigabit Ethernet signal testing, in particular to a clamp special for verifying gigabit Ethernet transformer signals.

Background

In order to ensure that the gigabit Ethernet transformer can normally work, verification under different environments is required, for example, extreme environments such as high temperature and low temperature are required, and the normal verification cannot be carried out, the thinking needs to be changed, a mode is used for replacing the difference of the network port signals under the extreme environment, which is influenced by the change of the transformer, the clamp is used for verifying, the verification is carried out on four pairs of differential lines of the transformer, voltage measurement is carried out on an oscilloscope, specific parameters are obtained, and the method is also used for verifying whether the gigabit Ethernet port can normally work. The clamp is convenient to operate and manufacture, low in cost and high in time efficiency and cost ratio.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a clamp special for verifying a gigabit Ethernet transformer signal, and provides a circuit board clamp with low cost and convenient operation.

The utility model is realized by the following steps: a clamp special for verifying a gigabit Ethernet transformer signal comprises a PCB, wherein network interfaces LAN1 and LAN2 are respectively arranged on two sides of the PCB, LAN1 is a signal input interface, and LAN2 is a signal output interface;

a transformer seat is arranged on the surface of the PCB, a plurality of pairs of connecting terminals are respectively arranged on two sides of the transformer seat, and a transformer is arranged on the transformer seat; the connection terminal on one side is connected to the LAN1 through a plurality of pairs of first differential transmission lines, and the connection terminal on the other side is connected to the LAN2 through a plurality of pairs of second differential transmission lines;

the LAN1 is connected with a network port of a device to be tested, and the LAN2 is connected with an oscilloscope.

Preferably, both LAN1 and LAN2 are standard RJ45 connectors.

Preferably, the oscilloscope is provided with four channels of CH1, CH2, CH3 and CH4, and the LAN2 sends the differential signal to the channels of CH1 and CH3 through the two channels.

Preferably, the number of the first differential transmission LINEs is 4 pairs, and the first differential transmission LINEs sequentially include LINEs 1, 2, LINEs 3, 4, LINEs 5, 6 and LINEs 7, 8 from bottom to top, wherein the LINEs 1, 2 are gigabit ethernet pair a, the LINE length is 1000mil, the LINEs 3, 4 are gigabit ethernet pair b, the LINE length is 2000mil, the LINEs 5, 6 are gigabit ethernet pair c, the LINE length is 3000mil, the LINEs 7, 8 are gigabit ethernet pair a, and the LINE length is 4000 mil.

Preferably, the number of the second differential transmission lines is 4 pairs.

Preferably, the number of the connection terminals per side is 4.

By adopting the technical scheme, the utility model can carry out signal verification on four pairs of differential line pairs of the gigabit Ethernet transformer so as to verify whether the gigabit Ethernet port can normally work or not.

Drawings

In order to more clearly illustrate 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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural view of the present invention.

In the figure: 1-PCB board, 2-transformer seat, 3-connecting terminal, 4-first differential transmission line, 5-second differential transmission line, 6-oscilloscope.

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1, the present invention provides a jig dedicated for verifying gigabit ethernet transformer signals, comprising a PCB board 1, and network interfaces LAN1 and LAN2 are respectively disposed on two sides of the PCB board 1, wherein LAN1 is a signal input interface, and LAN2 is a signal output interface. Preferably, both LAN1 and LAN2 are standard RJ45 connectors. LAN1 is connected to the device under test's portal and LAN2 is connected to oscilloscope 6.

Further, a transformer base 2 is arranged on the surface of the PCB 1, a plurality of pairs of connecting terminals 3 are respectively arranged on two sides of the transformer base 2, and a transformer is arranged on the transformer base 2. The connection terminal 3 on one side is connected to the LAN1 via a plurality of pairs of first differential transmission lines 4, and the connection terminal 3 on the other side is connected to the LAN2 via a plurality of pairs of second differential transmission lines 5.

Preferably, the number of the first differential transmission LINEs 4 is 4 pairs, and the LINEs 1, 2, LINE3, 4, LINEs 5, 6 and LINEs 7, 8 are sequentially arranged from bottom to top, wherein the LINEs 1, 2 are gigabit ethernet pair a, the LINE length is 1000mil, the LINEs 3, 4 are gigabit ethernet pair b, the LINE length is 2000mil, the LINEs 5, 6 are gigabit ethernet pair c, the LINE length is 3000mil, the LINEs 7, 8 are gigabit ethernet pair d, and the LINE length is 4000 mil. The number of the second differential transmission lines is also 4 pairs. Further, the number of the connection terminals per side is 4. The oscilloscope is provided with four channels of CH1, CH2, CH3, and CH4, and the LAN2 sends differential signals to the channels of CH1 and CH3 through the two channels, respectively.

The principle of the utility model is as follows: LAN1 is a standard RJ45 connector for interconnecting to a device under test port as a gigabit ethernet signal input. The transformer to be verified is welded on a PVB plate, a LINE1 and a LINE 2 are gigabit Ethernet PairA LINE pairs, the LINE length is 1000mil, a LINE3 and a LINE 4 are gigabit Ethernet PairB LINE pairs, the LINE length is 2000mil, a LINE5 and a LINE 6 are gigabit Ethernet PairC LINE pairs, the LINE length is 3000mil, a LINE7 and a LINE 8 are gigabit Ethernet PairD LINE pairs, the LINE length is 4000mil, equipment inserted in the LAN1 inputs gigabit Ethernet signals into the four differential LINE pairs, and the gigabit Ethernet signals are transmitted to the LAN2 through the transformer. LAN2 is also a standard RJ45 connector that outputs gigabit ethernet signals. Because the Ethernet signal is a differential signal, the differential signal is respectively sent to CH1 and CH3 channels of the oscilloscope through the two channels to test the differential signal, the gigabit Ethernet differential voltage is measured on the oscilloscope, and the voltage amplitude of the four pairs of differential line pairs is analyzed by comparing.

When the testing device is used for testing, the network port of the equipment to be tested is inserted into the input end of the LAN port, the transformer needing to be verified is welded on the transformer seat on the clamp plate, the voltage amplitude of the four pairs of differential lines is tested through the oscilloscope, the Pair A line pair testing is firstly carried out, the Pair A line length is 1000mil, the line length is the shortest, the voltage amplitude of the Pair A line pair is tested to be 780mV, and the requirement of the specification on the voltage of the gigabit Ethernet is met. And then carrying out PairB line pair test, wherein the PairB line length is 2000mil, the measured voltage amplitude of the PairB line pair is 770mV, and the requirement of the specification on the voltage of the gigabit Ethernet is also met. And then carrying out PairC line pair test, wherein the PairC line length is 3000mil, the measured voltage amplitude of the PairC line pair is 760mV, and the requirement of the specification on the voltage of the gigabit Ethernet is also met. And finally, carrying out Pair D line pair test, wherein the Pair D line length is 4000mil, the line length is the longest, the voltage amplitude of the Pair D line pair is 750mV, the requirement of the specification on the voltage of the gigabit Ethernet is still met, and finally, connecting the network port with other gigabit Ethernet port equipment, carrying out functional verification, normally working, and explaining that the influence of the differential line of the transformer on different line lengths is not serious, so that corresponding test parameters are obtained and recorded. The scheme is convenient to operate, simple to manufacture and easy to realize the verification of the kilomega network port transformer signal.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A clamp special for verifying gigabit Ethernet transformer signals is characterized by comprising a PCB, wherein network interfaces LAN1 and LAN2 are respectively arranged on two sides of the PCB, LAN1 is a signal input interface, and LAN2 is a signal output interface;

2. The fixture as claimed in claim 1, wherein the LAN1 and the LAN2 are standard RJ45 connectors.

3. The jig for verifying gigabit ethernet transformer according to claim 1, wherein four channels CH1, CH2, CH3 and CH4 are provided on the oscilloscope, and the LAN2 sends the differential signal to the channels CH1 and CH3 through two channels.

4. The fixture of claim 1, wherein the number of the first differential transmission LINEs is 4 pairs, and the first differential transmission LINEs are LINE1, 2, LINE3, 4, LINE5, 6 and LINE7, 8 from bottom to top, wherein the LINE1, 2 is a gigabit ethernet pair PairA, the LINE length is 1000mil, the LINE3, 4 is a gigabit ethernet pair PairB, the LINE length is 2000mil, the LINE5, 6 is a gigabit ethernet pair PairC, the LINE length is 3000mil, the LINE7, 8 is a gigabit ethernet pair PairD, and the LINE length is 4000 mil.

5. The fixture of claim 1, wherein the number of the second differential transmission lines is 4 pairs.

6. The fixture as claimed in claim 1, wherein the number of the connection terminals on each side is 4.