CN101029917A - Circuit-state analog device and system for testing apparatus functions - Google Patents

Abstract

The present invention is applicable to the field of line fault testing, and provides a line state simulation device and a function test system of a device under test. The device includes: a line state simulation module, which is composed of a line state simulation circuit, and is used to simulate the state of a communication external line ; The interface switching module is composed of a switching matrix circuit, which is used to switch the connection between the device under test and the line state analog circuit; and a control circuit module, which is used to receive commands from the control terminal, and convert the commands to drive the interface switching The module realizes the control signal of the corresponding circuit switching. The system includes a control terminal, a device under test and a line state simulation device respectively connected to the control terminal, and a test port of the line state simulation device is connected to a test port of the device under test. In the present invention, the line state simulating device provides a communication line state simulating circuit, which is fixed, easy to store, has good consistency and strong anti-interference ability.

Description

A line state simulation device and a device under test function test system

technical field

The invention belongs to the field of line fault testing, and in particular relates to a line state simulation device and a function testing system for tested equipment.

Background technique

With the development and popularization of Asymmetrical Digital Subscriber Loop (ADSL) technology, the "last mile" of the ordinary telephone network carries broadband Internet services in addition to ordinary telephone services. In the future, this section of the line may also carry more Business. The ADSL technology is mainly to transmit data flow at high speed on a single twisted wire telephone line, and this section of line is called a communication outside line. In the above background, the stability of communication lines is very important for users to use and operators to improve customer satisfaction. But in fact, this section of the line is spread all over the urban and rural areas, and failures will inevitably occur in case of bad weather or sudden accidents. The function of the line test board is to determine the cause of the failure of the communication line according to the characteristics of the electrical signal on the communication line, and to help the equipment operator quickly locate and solve the problem.

In order for equipment operators to more accurately locate the cause of line faults, it is necessary to test the sensitivity of the line test board. In order to test the sensitivity of the line test board, it is necessary to simulate various states of the communication external line, such as: normal line, ground leakage, poor insulation between AB lines, etc. In the prior art, various states of the external communication line are simulated by building different circuits, and a sensitivity test is performed on the line test board through the built circuit. For example: the tester connects the two sets of subscriber lines by connecting the telephones on the two subscriber lines respectively to simulate the mixed state of the communication lines. Through this circuit, the response sensitivity of the line test board to other mixed states of the communication line is used. The deficiencies of the prior art are:

1. Time-consuming: The simulation of the state of each communication external line needs to build a special circuit, and it is time-consuming to find devices and build lines.

2. Poor test repeatability: Temporarily built circuits are not easy to save, and need to be rebuilt for next use, resulting in poor reusability.

3. Poor consistency of test results: Due to the discreteness of the device itself and environmental factors, the temporarily built circuit may cause deviations in test results, resulting in poor consistency of test results.

4. Low efficiency: Temporary circuits need to be built manually during the test process, which cannot be automatically controlled, and the test efficiency is low.

Contents of the invention

The purpose of the embodiments of the present invention is to provide a line state simulation device, which aims to solve the time-consuming and poor repeatability of temporarily building circuits for simulating the line state of external communication lines in the prior art, which leads to the problem that when using a temporarily built circuit to test the line test board When the sensitivity is high, the test repeatability is poor, the test result consistency is poor, and the test efficiency is low.

The embodiment of the present invention is achieved in this way, a line state simulation device, the line state simulation device includes:

The line state simulation module is composed of a line state simulation circuit and is used to simulate the state of the communication outside line;

an interface switching module consisting of a switching matrix circuit for switching the connection between the device under test and the line state analog circuit; and

The control circuit module is used to receive the control command sent by the control port, and convert the command into a control signal for controlling the interface switching module.

Another object of the embodiments of the present invention is to provide a device under test function test system, the system includes a control terminal, and a device under test and a line state simulation device respectively connected to the control terminal, the line state simulation device The test port of the device under test is connected to the tested port of the device under test, and the line state simulation device includes:

The line state simulation module is composed of a line state simulation circuit and is used to simulate the state of the communication outside line;

an interface switching module consisting of a switching matrix circuit for switching the connection between the device under test and the line state analog circuit; and

The control circuit module is used to receive the control command sent by the control port, and convert the command into a control signal for controlling the interface switching module.

Embodiments of the present invention at least have the following beneficial effects:

The line state simulation circuit is established by the line state simulation device without temporarily building an analog circuit, which is convenient, fast and has good repeatability. The function test system of the equipment under test adopts a line state simulation device. The line state simulation circuit in this device is fixed, the circuit consistency and anti-interference ability are strong, and the test results are consistent. At the same time, the function test system of the equipment under test adopts automatic control for the line state simulation device and the equipment under test, which greatly reduces manual intervention and has high test efficiency.

Description of drawings

FIG. 1 is a structural diagram of a line state simulation device provided by an embodiment of the present invention;

Fig. 2 is the circuit configuration diagram of the external line fault qualitative simulation module provided by the embodiment of the present invention;

Fig. 3 is a circuit configuration diagram of a line parameter simulation module provided by an embodiment of the present invention;

Fig. 4 is a structural diagram of a device under test function test system provided by an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In the embodiment of the present invention, a line state simulation device is provided, in which a fixed circuit is established to simulate the state of the communication outside line, and a device under test function test system is provided at the same time, Under the control of the control terminal, the response sensitivity of the device under test to the states of the external communication line simulated by the line state simulation device is tested, so as to test the function of the device under test.

FIG. 1 shows the structure of a line state simulation device according to an embodiment of the present invention.

The line state simulation device includes a line state simulation module 12 , an interface switching module 14 and a control circuit module 16 . The line state simulation module 12 is composed of line state simulation circuits, and simulates various states of the communication outside lines by designing fixed analog circuits corresponding to various states of the communication outside lines. The line state simulation module 12 includes an outside line fault qualitative simulation module 122 for simulating various states of communication outside lines and a line parameter simulation module 124 for simulating circuit parameters such as ground resistance or ground capacitance. The line state simulation module 12 provides multiple external interfaces, and each interface corresponds to a communication line state simulation circuit. The switching between the interfaces is controlled by the interface switching module 14 . The control circuit module 16 communicates with the control terminal, receives control data from the control terminal, and converts the control data into a control signal for interface switching control of the interface switching module 14 .

The interface switching module 14 is mainly composed of a switching matrix, which may specifically be composed of decoders and analog switches, or may be composed of relays or other circuits. In the embodiment of the present invention, taking the relay as an example of the switching matrix, each output terminal of the relay matrix is respectively connected to the external interface provided by the line state simulation module 12, and the control signal is switched according to the interface of the control circuit module 16, and in the line state simulation module Switch between the external interfaces provided by 12 to select the communication external line state analog circuit corresponding to the external interface. For example, when the response sensitivity of the test line test board to the normal state of the communication outside line is needed, the interface switching module 14 is under the control of the control circuit module 16, and the tested port of the line test board is connected to the connection with the line state simulation module 12. On the external interface corresponding to the normal state of the analog communication external line.

The control circuit module 16 includes an interface circuit 162 , a control unit 164 and a driving circuit unit 166 . The interface circuit 162 communicates with the control terminal, receives a control command from the control terminal, and sends the control command to the control unit 164 . The interface circuit 162 may be, but not limited to, a serial port, an Ethernet port, a Universal Serial Bus (Universal Serial Bus, USB) interface, an infrared interface or a Bluetooth interface. The control unit 164 analyzes the received control command, and converts the control command into a control signal for interface switching control of the interface switching module 14, so as to control the interface switching module 14 to switch the external interface provided by the line state simulation module 12 . The control unit 164 may be, but not limited to, a single chip microcomputer or a central processing unit (Central Processing Unit, CPU). In the embodiment of the present invention, a single-chip microcomputer is taken as an example. The driving circuit unit 166 enhances the driving capability of the output signal of the control unit 164 , and its output can directly control the interface switching module 14 .

At the same time, the line state simulation device provided by the embodiment of the present invention provides button control, and the user can directly select the corresponding line simulation state through the buttons on the line state simulation device.

In order to facilitate the preservation and repeated use of the above line state simulation device, the line state simulation device can be packaged in a box structure.

FIG. 2 shows the circuit configuration of the external line fault qualitative simulation module 122 provided by the embodiment of the present invention.

This circuit can simulate the double-line-to-earth leakage, A-line-to-earth leakage, B-line-to-earth leakage, insulation difference between AB lines, self-mixing, AB line double-ground air, A-line ground air, and B-line ground air , Two-line other mixed, A-line mixed, B-line mixed, hung up, missed calls, not hung up and other line status.

Among them, the two-wire-to-ground leakage in the communication line fault means that the A line and the B line are respectively connected to the ground through a capacitor. Since the capacitor has the characteristics of passing AC, blocking DC, passing high frequency, and blocking low frequency, the A line and B line The AC high-frequency carrier signal on the capacitor flows to the ground through the capacitor. The principle of A line to ground leakage and B line to ground leakage is the same as above. The circuits corresponding to the a interface, the b interface and the c interface in Fig. 2 are the dual-wire-to-ground leakage simulation circuit, the A-line-to-ground leakage simulation circuit, and the B-line-to-ground leakage simulation circuit.

The circuit corresponding to the interface d in Figure 2 is an analog circuit for the insulation difference between AB lines, and the circuit corresponding to the interface e is a self-mixing analog circuit.

The ground gas in the communication line fault refers to the direct grounding of the line. The circuits corresponding to the f interface, the g interface and the h interface in Fig. 2 are the AB line dual ground air simulation circuit, the A line ground air simulation circuit and the B line ground air simulation circuit.

The circuit corresponding to the i interface in Fig. 2 is an analog circuit in the normal state of the phone, and this circuit is an empirical circuit for simulating the state of the phone.

In the communication line fault, it refers to the connection between one of a pair of subscriber lines and one of the other pair of subscriber lines. For example: when a pair of subscriber lines is connected to interface i and another pair of subscriber lines is connected to interface j, it is in a mixed state. In Fig. 2, the circuits corresponding to the j interface, the k interface and the 1 interface are A-line and other mixed analog circuits, B-line and other mixed analog circuits, and two-line and other mixed analog circuits.

The circuit corresponding to the m interface in Fig. 2 is an analog circuit of a missed phone.

It can be understood that if you want to realize the simulation of other states of the communication outside line, you only need to design the corresponding circuit for simulating the state, and add an interface in the circuit shown in Figure 2, and the circuit connected to this interface is the corresponding communication outside line state. analog circuits.

FIG. 3 shows the circuit configuration of the line parameter simulation module 124 provided by the embodiment of the present invention.

The circuit parameter simulation module 124 realizes circuit parameter simulation by variable resistors and variable capacitors. For example: line-to-ground resistance, line-to-ground capacitance. Specifically, the variable resistance circuit may use variable resistors or other electronic devices, and the variable capacitance circuit may specifically use variable capacitors or other electronic devices.

One end of the variable resistor or the variable capacitor is grounded, and one end is connected to the interface switching module 14, and the interface switching module 14 switches between the variable resistor and the variable capacitor according to actual needs, so that the variable resistor or variable capacitor can The variable capacitor is connected with the subscriber line. The other end of the variable resistor or the variable capacitor is connected to the control circuit module 16, and the control circuit module 16 controls the resistance value of the variable resistor or the capacitance value of the variable capacitor. The control circuit module 16 can control the resistance value of the variable resistor or the capacitance value of the variable capacitor through digital signals, and can also control the resistance value of the variable resistor connected to the circuit through other methods, such as through a relay matrix.

To sum up, the line state simulation device provided by the embodiment of the present invention establishes a line state simulation circuit corresponding to the state of the communication outside line, which is very convenient and fast, does not need to temporarily build an analog circuit, and the circuit has good repeatability and is easy to save and store. reuse.

Fig. 4 shows the structure of the device function test system of the embodiment of the present invention.

In the embodiment of the present invention, the device under test refers to a device for testing the state of a communication line, such as a line test board. The device under test function test system includes a control terminal 42 , and a line state simulation device 44 and a device under test 46 respectively connected to the control terminal 42 . The test port of the line state simulation device 44 is connected to the test port of the device under test 46 . The structure and principle of the line state simulation device 44 are as described above, and will not be repeated here.

The control terminal 42 is respectively connected to the maintenance port of the line state simulation device 44 and the device under test 46, and the maintenance port may be but not limited to a serial port, a network port, a USB port, an infrared port or a Bluetooth port. The test port of the line state simulation device 44 is connected to the test port of the device under test 46, and the connection medium may be but not limited to a cable or an optical fiber. The control terminal 42 sends control instructions to the line state simulation device 44 and the device under test 46 respectively, and the line state simulation device 44 receives the control command, and connects the test port of the corresponding state simulation circuit to the tested port of the device under test 46. The device under test is tested under control.

The line state simulation device 44 provides various communication external line simulation circuits for the function test system of the equipment under test. The simulation circuits are fixed and do not need to temporarily build various circuits, which is convenient, quick and easy to reuse. At the same time, the line state simulation device 44 is packaged in a box structure, which is easy to store, has strong circuit consistency and anti-interference ability, and has good test result consistency. During the testing process, the function testing system of the equipment under test adopts automatic control on the line state simulation device 44 and the equipment under test 46, which greatly reduces manual intervention and has high testing efficiency.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (10)

1. A line state simulation device, characterized in that the line state simulation device comprises: The line state simulation module is composed of a line state simulation circuit and is used to simulate the state of the communication outside line; an interface switching module, consisting of a switching matrix circuit, for switching the connection between the device under test and the line state analog circuit; and The control circuit module is used to receive commands from the control terminal, and convert the commands into control signals for driving the interface switching module to realize corresponding circuit switching. 2. The line state simulation device according to claim 1, wherein the line state simulation module comprises: The outside line fault qualitative simulation module adopts the analog circuit corresponding to each state of the communication outside line to simulate each state of the communication outside line; and The circuit parameter simulation module adopts variable resistors or variable capacitors to simulate circuit parameters. 3. The line state simulation device according to claim 1, wherein the switching matrix circuit is composed of a decoder and an analog switch or is composed of a relay. 4. The line state simulation device according to claim 1, wherein the control circuit module comprises: an interface circuit, configured to receive control data from the control terminal; A control unit, configured to receive the control data transmitted by the interface circuit, analyze the control data, and convert it into a control signal for controlling the interface switching module; and The driving circuit unit is used to enhance the driving capability of the output signal of the control circuit module. 5. The line state simulation device according to claim 2, characterized in that, the state of the external communication line includes double-line leakage to ground, line A to ground leakage, line B to ground leakage, poor insulation between AB lines, Self-mixing, AB-line dual ground air, A-line ground air, B-line ground air, dual-line mixed, A-line mixed, B-line mixed, hung up, missed or not hung up. 6. A device under test function test system, characterized in that the system includes a control terminal, and a device under test and a line state simulation device respectively connected to the control terminal, the test port of the line state simulation device is connected to the The tested port of the device under test is connected; the line state simulation device includes: The line state simulation module is composed of a line state simulation circuit and is used to simulate the state of the communication outside line; The interface switching module is composed of a switching matrix circuit, which is used to switch the connection between the device under test and the line state analog circuit; and a control circuit module, which is used to receive commands from the control terminal, and convert the commands into driving the interface switching module Realize the control signal of the corresponding circuit switching. 7. The function test system of the device under test according to claim 6, wherein the line state simulation module includes: The outside line fault qualitative simulation module adopts the analog circuit corresponding to each state of the communication outside line to simulate each state of the communication outside line; and The circuit parameter simulation module adopts variable resistors or variable capacitors to simulate circuit parameters. 8. The line state simulation device according to claim 6, wherein the switching matrix circuit is composed of a decoder and an analog switch or is composed of a relay. 9. The function test system of the device under test according to claim 6, wherein the control circuit module comprises: an interface circuit for receiving control data from the control terminal; a control unit, configured to receive the control data transmitted by the interface circuit, analyze the data, and convert the data into a control signal for controlling the interface switching module; and The driving circuit is used to enhance the driving capability of the output signal of the control circuit module. 10. The function test system of the device under test according to claim 7, characterized in that, the status of the communication external line includes two-wire-to-earth leakage, A-line-to-earth leakage, B-line-to-earth leakage, and insulation difference between AB lines , Self-mixing, AB-line dual ground air, A-line ground air, B-line ground air, dual-line mixed, A-line mixed, B-line mixed, hung up, missed or not hung up.

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