Ethernet twisted pair detection circuit

Abstract

The utility model provides a kind of ethernet twisted pair line detection circuit, belong to circuit technical field.This detection circuit includes controller, first RJ45 connector, second RJ45 connector, first voltage divider branch, second voltage divider branch, amplifier circuit, key circuit and display interface circuit.The utility model is sent high level by controller phase two different pins of RJ45 connector, according to the result of reception, the twisted pair line connected between two RJ 45 connectors is detected and judged, and the result is sent to display by display interface circuit and is shown, realizes to integrate twisted pair line type, connection mode and other multiple detections, fast and efficient and can be displayed in real time.

Description

Technical Field

[0001] This utility model belongs to the field of circuit technology, and relates to a detection circuit, particularly to an Ethernet twisted-pair detection circuit. Background Technology

[0002] Network cables are essential for connecting local area networks (LANs). The most common types of network cables used in LANs are twisted-pair cables, coaxial cables, and fiber optic cables. Twisted-pair cables, composed of many pairs of wires, are widely used due to their low cost, such as in telephone lines. They are used to connect to RJ45 connectors and come in two types: STP and UTP. However, most existing network connection detection devices can only detect and identify the connection relationships of twisted-pair cables, offering limited functionality and failing to provide a clear visual display of the results. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide an Ethernet twisted-pair detection circuit that detects and identifies the twisted-pair type, connection relationship, etc. through circuit elements.

[0004] The objective of this utility model can be achieved through the following technical solutions:

[0005] An Ethernet twisted-pair detection circuit includes a controller, a first RJ45 connector, a second RJ45 connector, a first voltage divider branch, a second voltage divider branch, an amplifier circuit, a button circuit, and a display interface circuit. The shield pin 13 of the first RJ45 connector is connected to +5V, pin 1 is connected to the GPIO port of the controller, pin 6 is connected to +5V, and pin 8 is connected to the non-inverting input of the amplifier circuit and the input of the first voltage divider branch, respectively. The output of the first voltage divider branch is connected to the inverting input of the amplifier circuit. The shield pin 13 of the second RJ45 connector is connected to the GPIO port of the controller, pin 1 is connected to +5V, pin 6 is connected to the GPIO port of the controller, and pin 8 is connected to the input of the second voltage divider branch. The output of the second voltage divider branch is connected to the inverting input of the amplifier circuit. The output of the amplifier circuit is connected to the GPIO port of the controller. The display interface circuit is connected to the GPIO port of the controller through the button circuit.

[0006] The principle of this invention is as follows: After connecting the two ends of the twisted pair cable to the first RJ45 connector and the second RJ45 connector respectively, the controller detects the signals of pin 1 of the first RJ45 connector, pin 6 of the second RJ45 connector, pin 13 of the second RJ45 connector, and the output of the amplifier circuit. The controller obtains the signal characteristics of pin 13 of the second RJ45 connector through the GPIO port and determines the type of twisted pair cable by combining it with its internally preset characteristic threshold. The controller obtains the signal characteristics of pin 1 of the first RJ45 connector and pin 6 of the second RJ45 connector through the GPIO port to realize twisted pair cable sequence detection, determine the connection type of the twisted pair cable (crossover / straight-through), and can also perform short circuit / open circuit fault detection. The controller obtains the output result of the amplifier circuit through the GPIO port to perform cable impedance detection. The detection result is sent to the display for display through the display interface circuit.

[0007] Preferably, the amplifier circuit includes an amplifier AD623, a capacitor C1, a resistor R1, and a resistor R2. Pin 1 of the amplifier AD623 is connected to pin 8 through resistor R1. Pin 7 is connected to a +4.2V voltage and one end of capacitor C1, and the other end of capacitor C1 is grounded. Pins 4 and 5 are grounded. Pin 2 serves as the inverting input terminal, pin 3 serves as the non-inverting input terminal, and pin 6 serves as the output terminal connected to one end of resistor R2. The other end of resistor R2 is connected to the controller.

[0008] Preferably, the first voltage divider branch includes resistors R5 and R6 connected in series, with a +4.2V voltage connected between resistors R5 and R6; the second voltage divider branch includes resistors R7 and R8 connected in series, with resistors R7 and R8 grounded.

[0009] Preferably, the resistors R5, R6, R7, and R8 have the same resistance value.

[0010] Preferably, the output terminals of the first voltage divider path and the second voltage divider path are connected to the inverting input terminal of the amplifier circuit through the same optocoupler U8; pin 8 of the first RJ45 connector is connected to the non-inverting input terminal of the amplifier circuit through optocoupler U5.

[0011] Preferably, a first RC filter circuit is connected between the optocoupler U8 and the inverting input terminal of the amplifier circuit, and a second RC filter circuit is connected between the optocoupler U5 and the non-inverting input terminal of the amplifier circuit.

[0012] Compared with existing technologies, this Ethernet twisted-pair detection circuit has the following advantages:

[0013] This invention can perform multi-faceted testing on Ethernet twisted-pair cables and display the results in real time, thus improving the efficiency and convenience of Ethernet twisted-pair cable testing. Attached Figure Description

[0014] Figure 1 This is a circuit diagram for Ethernet twisted-pair detection in the embodiment. Detailed Implementation

[0015] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0016] like Figure 1 As shown, this embodiment of the invention provides an Ethernet twisted-pair detection circuit, including a controller, a first RJ45 connector, a second RJ45 connector, a first voltage divider branch, a second voltage divider branch, an isolation circuit, a filtering circuit, an amplifier circuit, a button circuit, and a display interface circuit. It should be noted that in this embodiment, the controller uses an STM32 series processor, preferably an STM32F103C8T6-CARD chip; the first and second RJ45 connectors preferably both use the DGKYD211B002CD2A4D model network port, which has signal pins 1-8 and shielding pin 13; the isolation circuit preferably uses a TLP281 optocoupler, including optocouplers U8 and U9; the amplifier circuit preferably uses an AD623 amplifier; the button circuit mainly uses a tactile switch; the controller is connected to a 1.3-inch OLED display screen 12864 through the display interface circuit.

[0017] Specifically, pin 13 of the shield of the first RJ45 connector is connected to +5V, pin 1 is connected to pin 3 of the controller, pin 6 is connected to +5V, and pin 8 is connected to the non-inverting input of amplifier AD623 and the input of the first voltage divider branch, respectively. The output of the first voltage divider branch is connected to the inverting input of amplifier AD623. The first voltage divider branch includes resistors R5 and R6 connected in series, with +4.2V connected between resistors R5 and R6. Pin 13 of the shield of the second RJ45 connector is connected to pin 4 of the controller, pin 1 is connected to +5V, pin 6 is connected to pin 2 of the controller, and pin 8 is connected to the input of the second voltage divider branch. The output of the second voltage divider branch is connected to the inverting input of amplifier AD623. The output of amplifier AD623 is connected to pin 25 of the controller. The second voltage divider branch includes resistors R7 and R8 connected in series, with R7 and R8 grounded. Resistors R5, R6, R7, and R8 have the same resistance value.

[0018] The output terminals of the first and second voltage divider paths are connected to the inverting input of the amplifier circuit via the same optocoupler U8; pin 8 of the first RJ45 connector is connected to the non-inverting input of the amplifier circuit via optocoupler U5. Specifically, the positive terminal of the LED of optocoupler U8 is connected to the controller, and the negative terminal is grounded; the photodetector input of optocoupler U8 is connected to the output terminals of the first and second voltage divider paths, and the output is connected to the inverting input of the amplifier circuit. A first RC filter circuit is connected between optocoupler U8 and the inverting input of the amplifier circuit, and a second RC filter circuit is connected between optocoupler U5 and the non-inverting input of the amplifier circuit.

[0019] The amplifier circuit also includes capacitor C1, resistor R1, and resistor R2 connected to amplifier AD623. Pin 1 of amplifier AD623 is connected to pin 8 through resistor R1. Pin 7 is connected to a +4.2V voltage and one end of capacitor C1, with the other end of capacitor C1 grounded. Pins 4 and 5 are grounded. Pin 2 serves as the inverting input, pin 3 as the non-inverting input, and pin 6 serves as the output, connected to one end of resistor R2. The other end of resistor R2 is connected to pin 25 of the controller.

[0020] Pin 1 of the display interface circuit is connected to one end of tactile switch U9, one end of tactile switch U10 and the ground terminal respectively. The other end of tactile switch U9 is connected to controller pin 36, the other end of tactile switch U10 is connected to controller pin 34, pin 2 is connected to the controller power pin 38, pin 3 is connected to controller pin 16, and pin 4 is connected to controller pin 17.

[0021] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An Ethernet twisted-pair detection circuit, characterized in that, The system includes a controller, a first RJ45 connector, a second RJ45 connector, a first voltage divider branch, a second voltage divider branch, an amplifier circuit, a button circuit, and a display interface circuit. The shield pin 13 of the first RJ45 connector is connected to +5V, pin 1 is connected to the GPIO port of the controller, pin 6 is connected to +5V, and pin 8 is connected to the non-inverting input of the amplifier circuit and the input of the first voltage divider branch, respectively. The output of the first voltage divider branch is connected to the inverting input of the amplifier circuit. The shield pin 13 of the second RJ45 connector is connected to the GPIO port of the controller, pin 1 is connected to +5V, pin 6 is connected to the GPIO port of the controller, and pin 8 is connected to the input of the second voltage divider branch. The output of the second voltage divider branch is connected to the inverting input of the amplifier circuit. The output of the amplifier circuit is connected to the GPIO port of the controller. The display interface circuit is connected to the GPIO port of the controller through the button circuit.

2. The Ethernet twisted-pair detection circuit according to claim 1, characterized in that, The amplifier circuit includes an amplifier AD623, a capacitor C1, a resistor R1, and a resistor R2. Pin 1 of the amplifier AD623 is connected to pin 8 through resistor R1. Pin 7 is connected to a +4.2V voltage and one end of capacitor C1, and the other end of capacitor C1 is grounded. Pins 4 and 5 are grounded. Pin 2 serves as the inverting input terminal, pin 3 serves as the non-inverting input terminal, and pin 6 serves as the output terminal connected to one end of resistor R2. The other end of resistor R2 is connected to the controller.

3. An Ethernet twisted-pair detection circuit according to claim 1 or 2, characterized in that, The first voltage divider branch includes resistors R5 and R6 connected in series, with a +4.2V voltage connected between resistors R5 and R6; the second voltage divider branch includes resistors R7 and R8 connected in series, with resistors R7 and R8 grounded.

4. The Ethernet twisted-pair detection circuit according to claim 3, characterized in that, The resistors R5, R6, R7, and R8 have the same resistance value.

5. The Ethernet twisted-pair detection circuit according to claim 3, characterized in that, The output terminals of the first and second voltage divider branches are connected to the inverting input terminal of the amplifier circuit via the same optocoupler U8; pin 8 of the first RJ45 connector is connected to the non-inverting input terminal of the amplifier circuit via optocoupler U5.

6. The Ethernet twisted-pair detection circuit according to claim 5, characterized in that, A first RC filter circuit is connected between the optocoupler U8 and the inverting input terminal of the amplifier circuit, and a second RC filter circuit is connected between the optocoupler U5 and the non-inverting input terminal of the amplifier circuit.

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