KR19980031239A - Automatic inspection circuit for abnormality of X-point switch IC - Google Patents

Abstract

The present invention relates to an automatic inspection circuit for abnormality of an X-point switch IC. When one of the 16 signals inputted from the analog demux is inputted and the 8 signals are output again, the analog mux is inputted to these eight inputs. When one of the sinusoidal signals is selected and output, and the tone detection circuit unit generates a TTL signal from the input signal and outputs a high or low signal, the CPU checks for abnormality of the X-point switch IC from the low or low signal. It is a device that can give alarm through the alarm generator if it is judged abnormal.It is a call function test by incorporating automatic test function into the system by using a CPU with a test pattern. If the failure occurs at the installation site, the X-point switch IC may be defective. As it is possible to verify whether the defect is easy, it is possible to identify the cause quickly and accurately service for A / S request. Economically, it is not necessary to make a separate production jig, and it can be newly developed by applying to a new hardware system. Done.

Description

Automatic inspection circuit for abnormality of X-point switch IC

1 is a functional block diagram showing an application circuit of a conventional X-point switch,

2 is a functional block diagram showing an automatic inspection circuit for the abnormality of the X-point switch IC according to the present invention,

3 is a circuit diagram and an operation truth table of a 1x16 demultiplexer according to an embodiment of the present invention.

4 is a circuit diagram and an operation truth table of an 8x1 multiplexer according to an embodiment of the present invention.

5 is an operation flowchart for explaining the operation according to FIG.

6 is coordinates for explaining the operation of the X-point switch IC.

* Description of the symbols for the main parts of the drawings *

1, 5: Program ROM 2, 6: CPU1

3, 9: X-point switch IC 4: Peripheral circuit

7: tone detection circuit section 8: analog mux

10: sinusoidal wave generator 11, U1, U2: analog demux

12: alarm generating unit

The present invention relates to an X-point switch IC, and more particularly, to an X-point switch IC capable of automatically checking whether the X-point switch IC is widely used as a subscriber switching element of various communication systems. The present invention relates to an automatic inspection circuit.

Currently, the X-point switch IC applicable to the subscriber channel switching function of various analog communication systems is switched to the subscriber switching circuit part of the national and private exchanges, the simple bus type interphone switching system, and the bus type unmanned electronic security system. It is used in inequality.

1 is a functional block diagram showing an application circuit of a conventional X-point switch, in which reference numeral 1 is a program ROM in which programs necessary for communication of various communication systems are embedded, and 2 is stored in the program ROM 1. The CPU 3 controls peripheral circuits corresponding to the communication between the subscriber and the caller based on the predetermined data, and 3 is controlled by the CPU 2 to transmit 8 and 16 data to the peripheral circuits to be described later. The X-point switch IC, 4, which outputs through a line and is in charge of a switching function, is a peripheral circuit that inputs a predetermined data signal output from the X-point switch IC 3 and executes a corresponding operation.

That is, in the above configuration, when the CPU 2 operates according to the contents of the predetermined data stored in the program ROM 1 and controls the peripheral circuits, the X-point switch IC 3 causes the CPU 2 Under the control of), the data input through 8 and 1 data lines are output to the peripheral circuit 4 or the switching operation is executed.

By the way, the conventional circuit switching circuit does not have the additional function of checking the abnormality of the X-point switch IC, and after manufacturing the product, separately make a test jig for the PCB equipped with the X-point switch IC, During the test call, it was troublesome to determine whether there was an abnormality of the IC, and when there was a problem with the communication equipment due to short circuit or lightning during the shipment of the product, it was determined whether the subscriber line was defective or the switching circuit was defective by the call. It was hard to do.

Accordingly, the present invention has been made in view of the above circumstances, and further includes an additional circuit capable of automatically inspecting the X-point switch IC in the communication path switching circuit, thereby providing a test time using a separate production jig. Its purpose is to improve reliability and convenience in equipment operation by providing a circuit that can shorten and promptly replace after-sales problems and identify the cause and replace it.

An automatic inspection circuit for abnormality of the X-point switch IC according to the present invention for realizing the above object includes a processor CPU for controlling the entire circuit, a program ROM (EPROM) for storing a program relating to the overall circuit control of the CPU, A sinusoidal wave generator for generating a test audio signal of 1 kHz, an analog demux for inputting a signal in a desired Y coordinate divided into 16 outputs by one input input from the sinusoidal wave generator, and an output from the analog demux. An X-point switch IC for inputting an audio signal to one of 16 signals and outputting eight signals, an analog mux for selecting any one of eight X coordinate outputs output from the X-point switch IC, and the analog mux Tone detection that generates TTL signal according to the presence or absence of signal using filter characteristics from selected analog signal output from If the CPU detects an abnormality from the TTL signal outputted from the tone detection circuit unit and if the X-point switch IC is destroyed, the tone detection circuit unit maintains a high state and contacts the contact point of the X-point switch IC. It is composed of an alarm generating unit for notifying that an abnormality has occurred.

In addition, the analog demux is characterized by consisting of two 1 × 8 analog demux, in the analog demux input a 1 ㎑ sine wave signal from the two 1 × 8 analog demux to the X terminal, IN1, IN2 , Combination of three signals of IN3 to select one of eight outputs (X0 ~ X7), and select one of two groups of signals A and B by using enable signal.Sine wave when / ENA is low The signal is input to one of the Y0 ~ Y7 terminal of the X-point switch IC, the sine wave signal is input to one of the Y8 ~ Y15 terminal of the X-point switch IC when / ENB is low, the analog mux Selecting one of eight inputs (X0 to X7) by combining three signals of OUT1, OUT2, and OUT3 and inputting the output X to the tone detection circuit using the execution signal (/ ENC). -Point switch IC starts with X coordinate from # 1 If you increase the # 8 and increase the Y coordinate from # 1 to # 16, connect the contacts of the corresponding positions in order. If the output of the tone detection circuit is high, the sine wave input signal is not output. It is characterized by being destroyed.

That is, according to the present invention having the above-described configuration, it is possible to automate the call function test by incorporating an automatic inspection function in the system by using a PCU having a test pattern for switching the call path, which is technically dependent on hand, In case of failure at the installation site, it is possible to verify whether the X-point switch IC is defective or the subscriber circuit is defective, so that the cause can be easily identified, enabling quick and accurate service for the A / S request. Production jig is unnecessary, and new development is possible by applying to new hardware system.

Next, an embodiment according to the present invention will be described.

2 is a functional block diagram showing an automatic inspection circuit for an abnormality of the X-point switch IC according to the present invention, and the detailed description of the same components as those of FIG. 1 will be omitted.

In the drawing, reference numeral 6 controls the entire circuit, and in particular, as a control unit for determining the abnormality of the X-point switch IC by the high and low level TTL (Transister Transister Logic) signals output from the tone detection circuit unit described later. 7 is a tone detection circuit that generates and outputs a TTL signal from an analog signal output from an analog mux, and 8 is an analog mux for selecting any one of eight X coordinate outputs output from an X-point switch IC. Is an X-point switch IC that inputs an audio signal and outputs 8 signals by one of 16 signals output from the analog demux.

In addition, reference numeral 10 is a sinusoidal wave generator for generating a test audio signal of 1 kHz, and 11 is an analog for inputting a signal in a desired Y coordinate divided into 16 outputs by one input input from the sinusoidal wave generator 10. The demux 12 is an alarm generation unit for alerting the abnormal state of the X-point switch IC 9 by the CPU 6 from the TTL signal output from the tone detection circuit unit 7.

Hereinafter, the operation of the device having the above-described configuration will be described with reference to the operation flowchart shown in FIG.

Initially, in the state where the counter value of the Y coordinate of the X-point switch IC 9 is initialized (ST step 1) and the counter value of the X coordinate is initialized (step ST 2), 1 from the sine wave generator 10 When the test audio signal of 출력 is outputted, the analog demux 11 of the 1 input and 16 output inputs the Y coordinate value (ST step 3). Referring to the circuit diagram and operation truth table shown in FIG. As follows.

In other words, the analog demux (U1, U2) consisting of two 1x8 (1 input 8 output) circuits inputs a 1 ㎑ sine wave signal to the X terminal and combines three signals of IN1, IN2, and IN3 of U1. By selecting one of the outputs (X0 ~ X7) and using the enable signal, one of the two groups of signals A and B is selected. When / ENA is low, the sine wave signal is the X-point switch IC (9). When one of the terminals Y0 to Y7 is input and / ENB is low, the sine wave signal is input to one of the terminals Y8 to Y15 of the X-point switch IC 9.

Next, under the control of the CPU 6, the X coordinate value is input to the analog mux 8 of the eight inputs and one output (ST step 4), which will be described with reference to the circuit diagram and the operation truth table shown in FIG. Is as follows.

As shown, the analog mux 8 composed of one eight input one output mux selects one of the eight inputs (X0 to X7) by combining three signals OUT1, OUT1, and OUT3, and the enable signal (/ The output X is inputted to the tone detection circuit unit 7 using ENC).

In addition, the contact inside the X-point switch IC 9 is turned on by input and designation of the X and Y coordinates (ST step 5), which will be described with reference to the coordinates shown in FIG. Is as follows.

That is, by increasing the X coordinate from # 1 to # 8 and again increasing the Y coordinate from # 1 to # 16, by connecting the contacts of the corresponding position in order to the high or low level sinusoidal signal to the tone detection circuitry (7) Will print.

In addition, the CPU 6 controls the tone detection circuit unit 7 from the signal which is turned on and output from the X-point switch IC 9, and the tone detection circuit unit 7 is shown in FIG. As described above, the TTL signal is generated at the OUT terminal according to the presence or absence of 1 sine wave signal from the signal output through the X terminal of the analog mux 8 (ST 6 step), and the tone is not detected. In this case, a predetermined alarm is executed through the alarm generating unit 12 (ST 8), and when a tone is detected, the CPU 6 increases the counter value of the X coordinate by +1 (ST 7). step).

When the X coordinate of the X-point switch IC 9 is larger than 8 (ST 9 steps), the CPU 6 initializes the counter value of the X coordinates (ST 10 steps), and then the counter value of the Y coordinates. Is increased by +1 (ST step 11), and if the value of Y coordinate is greater than 16 (ST 12 steps), the counter value of Y coordinate is initialized (ST step 13).

That is, as described above, in the present invention, the operation of the entire circuit is implemented by the control of the CPU 6, and in particular, each contact point of the X-point switch IC 9 is fed back again after execution of the result at the contact point of the predetermined position. The state of the contact is continuously checked up to the contact of X7 and Y15.

On the other hand, the present invention is not limited to the above embodiments and can be modified in various ways without departing from the technical spirit of the present invention.

As described above, according to the present invention, it is possible to automate the call function test by incorporating the automatic test function into the system using a CPU having a test pattern for switching the call function, which was technically dependent on the hand. In the event of a failure, it is possible to verify whether the X-point switch IC is defective or the subscriber circuit is defective, so that the cause can be easily identified, enabling quick and accurate service for the A / S request. It is possible to realize an automatic inspection circuit for abnormality of the X-point switch IC, which is not required to be manufactured and applied to a new hardware system, thereby enabling new development.

Claims (5)

A processor CPU that controls the entire circuit, A program ROM (EPROM) for storing a program relating to the overall circuit control of the CPU; A sinusoidal wave generator for generating a 1 kHz test audio signal, An analog demux for dividing into 16 outputs by inputting the sinusoidal wave generator and inputting a signal in a desired Y coordinate; An X-point switch IC for inputting an audio signal to one of sixteen signals output from the analog demux and outputting eight signals; An analog mux for selecting any one of eight X coordinate outputs output from the X-point switch IC, A tone detection circuit unit for generating a TTL signal according to the presence or absence of a signal using a filter characteristic from the selected analog signal output from the analog mux; When the CPU detects an abnormality from the TTL signal output from the tone detection circuit unit, that is, when the X-point switch IC is destroyed, the tone detection circuit unit maintains a high state, thereby causing an abnormality in the X-point switch IC. Automatic inspection circuit for abnormality of the X-point switch IC including an alarm generating unit to indicate that the alarm is generated. The method of claim 1, The analog demux is an automatic inspection circuit for abnormality of the X-point switch IC, characterized in that consisting of two 1 × 8 analog demux. The method of claim 1, In the analog demux, a 1 sine wave signal is input to the X terminal from two 1 × 8 analog demuxes, and any one of eight outputs (X0 to X7) is selected by combining three signals IN1, IN2, and IN3. , Select one of the two groups A and B using the enable signal, when / ENA is low, the sine wave signal is input to one of the Y0 ~ Y7 terminals of the X-point switch IC, / ENB is An automatic inspection circuit for an abnormality of an X-point switch IC, wherein a sine wave signal is input to one of the Y8 to Y15 terminals of the point switch IC when it is low. The method of claim 1, The analog mux selects one of eight inputs (X0 to X7) by combining three signals OUT1, OUT2, and OUT3, and inputs the output X to the tone detection circuit using the execution signal / ENC. Automatic inspection circuit for abnormality of X-point switch IC. The method of claim 1, The X-point switch IC increases the X coordinate from # 1 to # 8, and again increases the Y coordinate from # 1 to # 16, and connects the contacts of the corresponding positions in order, and if the output of the tone detection circuit is high, , If it is low, the sinusoidal plate input signal is not output, and the contact point is broken.