KR19980023435A - Subscriber test apparatus and method for performing line condition test, digit transmission test of telephone, etc. - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a subscriber test apparatus that can perform a line condition test, a dial pulse of a telephone, or a transmission state test of a complex frequency theory.

Subscriber test apparatus according to the present invention includes a test control unit 24; An exchange unit selector 11 configured to configure a test circuit for each test type under the control of the test control unit 24; A measurement function selector 14 connected to the exchange unit selector 11; A first hybrid circuit portion 12 connected to the exchange unit selection portion 11; A first codec circuit portion 13 and a second codec circuit portion 16 connected in series with the first hybrid circuit portion 12; A second hybrid circuit portion 17 connected to the second codec circuit portion 16; An interrupt converter 16 connected to the exchange unit selector 11; An automatic gain adjusting unit 19 connected to the first hybrid circuit unit 12; A tone reception analyzer 20 connected to the automatic gain adjustment unit 19; A filter unit 21 connected to the automatic gain adjusting unit 19; A frequency converter 22 connected to the filter unit 21; A DC voltage converter 23 connected to the frequency converter 22; A sound generating unit 18 connected between the first codec circuit unit 13 and the second codec circuit unit 16; And a digital multimeter unit 15 connected to the DC voltage converter 23 and the measurement function selector 14, respectively.

By doing so, the resistance and capacitance distributed in the subscriber line can be measured and used for the determination of the line failure state.

Description

Subscriber test device and method for performing line condition test, digit transmission test of telephone, etc.

The present invention relates to a private switch operator equipment, and more particularly, to a test apparatus and method for testing the condition of subscriber lines and telephones.

Since data on the status of the subscriber line and the acceptance of the subscriber are necessary for the operation of the private exchange, a means for obtaining such data is conventionally provided.

1 is a functional diagram of a circuit for testing a conventional subscriber line state and whether the telephone is mounted.

1, a polarity inversion circuit portion 1 connected to a subscriber line to be tested and inverting a voltage supplied to the subscriber line and a voltage supplied inside the exchanger at the time of polarity inversion in the polarity inversion circuit portion 1 are distributed. The voltage distribution circuit section 2, the differential voltage measurement circuit section 3 for measuring a change in the voltage distributed by the distribution voltage circuit section 2, and the data measured by the differential voltage measurement circuit section 3 are digital data. A test control unit 5 for converting the AC DC converter 4 to convert the digital data converted by the AC DC converter 4 into the memory in order, and determining the fault state of the line and whether the telephone is connected. And a serial I / O circuit section 6 for transferring test request and response messages between the test control section 5 and the exchange system.

Referring to the subscriber line state test method according to the configuration of Figure 1, the voltage of -48 volts supplied from the exchanger is to charge the capacitor of the line and the phone via the test resistor in the voltage distribution circuit (2).

After charging, the test control section 5 operates a relay in the polarity inversion circuit section 1 to reverse the polarity of the voltage supplied to the subscriber line.

The differential amplifier in the differential voltage measuring circuit section 3 amplifies the voltage difference applied to the test resistor in the discharge state made through the capacitor in the line and the telephone as the polarity is reversed.

The AC DC converter 4 converts the difference of the amplified voltage into digital data and outputs the digital data to the test controller 5.

The test control unit 5 reads the converted digital data and stores them in the memory in order.

Continue measuring until the voltage across the test resistance reaches zero to determine the type of fault on the line, such as ground or disconnection.

The method of testing whether the subscriber phone is created according to the configuration of FIG. 1 is the same as that of the subscriber line state test method, but it is determined whether the phone is installed by analyzing a discharge voltage value that changes with time in the discharge process.

Subscriber Line and Telephone State It is desirable to be able to measure the capacitance and resistance of the line that depends on the length of the subscriber line and use it as test data, and to test the outgoing state of dial pulse or complex frequency tone of the telephone. In the test method, it is possible to obtain different test results for the same line state by measuring only the voltage applied to the test resistance of the voltage divider circuit and to determine the state of the line. There was a problem.

An object of the present invention is to measure the line, the resistance and capacitance of the subscriber line to determine the line state, the state of the line, the dial pulse or outgoing state test of the complex frequency tone of the telephone, the call test and the line confirmation test The present invention provides a test apparatus and a method thereof.

1 is a functional diagram of a circuit for testing a conventional subscriber line state and whether the telephone settled.

2 is a functional diagram of a subscriber test apparatus according to the present invention.

3 is a floor chart showing a method for testing a track condition according to the present invention.

Figure 4 is a floor chart showing a method for testing a call between the operator and subscriber or between the line tester and the operator in accordance with the present invention.

Fig. 5 is a floor chart showing a method of testing a fault condition of a telephone for transmitting a dial pulse to a digit according to the present invention.

6 is a floor chart showing a method for testing a fault condition of a telephone for transmitting a complex frequency tone to a digit according to the present invention.

Figure 7 is a floor chart showing a subscriber line identification test method according to the present invention.

2 is a functional diagram of a subscriber test apparatus according to the present invention. Referring to FIG. 2, the test control unit 24 controls all operations of the test apparatus, processes the measurement data, and determines the test result, and the configuration and exchange unit of the test circuit for each test type under the control of the test control unit 24. A test unit connected to the exchange unit selector 11 and an exchange unit selector 11 connected directly to the test subscriber line, the selection of a tip / ring or a ground wire, and the like. Is connected to the measurement function selection unit 14 and the exchange unit selection unit 11 to supply or cut the voltage to the line according to the control of) and to block the passage of the DC component of the signal. A first hybrid circuit unit 12 connecting a communication path and a 4-wire communication path, and a first codec circuit unit 13 connected in series to the first hybrid circuit unit 12 to convert analog signals and digital signals to each other. ) And second codec A second hybrid circuit section 17 connected to the furnace section 16 and the second codec circuit section 16 to block passage of a direct current component of a signal and to connect a two-wire and four-wire communication paths; An interrupt converter 16 connected to the selector 11 to convert the potential difference of the dial pulses to a TTL level and output an interrupt signal to the test controller 24; and the first hybrid circuit part 12; An automatic gain adjusting unit 19 connected to the automatic gain adjusting unit 19 to adjust the magnitude of the signal, a tone receiving analysis unit 20 connected to the automatic gain adjusting unit 19 to convert a complex frequency tone into digital, and the automatic gain adjusting unit 19 A filter unit 21 for removing components other than the entire band of the complex frequency tone used for the converter and a pure frequency component extracting only pure composite frequency components corresponding to the digits sent to the filter unit 21. Converter 22 and the frequency conversion (22) connected between the DC voltage converting section (23) for converting the AC effective value voltage of the complex frequency tone into a DC voltage, and between the first codec circuit section (13) and the second codec circuit section (16). It is connected to the generated sound generating unit 18, the DC voltage converter 23 and the measurement function selection unit 14 to measure test data, and output the measured data to the test control unit 24 in series. And a serial input / output unit 25 connected between the digital multimeter unit 15 and the test control unit 24 and the exchange system control unit or the operator terminal to transmit test requests, response messages, and the like.

Exchange Unit (EU) means the module of the exchange device to which the subscriber is directly connected, and the type of test measures the line condition test, the outgoing state test of the dial pulse or complex frequency tone of the telephone, the pass test and the line verification test. Item means line resistance, capacitance and line voltage, respectively.

3 is a floor chart showing a line state test method according to the present invention.

Referring to FIG. 3, the test control unit 24 selects an exchange unit in which a subscriber line to be tested is accommodated according to a test request message of a private exchange control unit or an operator, and selects an exchange unit selection unit 11. 14), the first hybrid circuit unit 12 is cut off, and the subscriber line, the exchange unit, the exchange unit selector 11, the measurement function selector 14, the digital multimeter unit 15, and the test control unit ( Configure a line test circuit connected to 24 (S110).

The measurement function selection unit 14 selects a measurement item under the control of the test control unit 24 (S120).

The digital multimeter unit 15 includes a measurement terminal (Tip), a ring, a tip, a first type ground, a ring, and a test unit selected by the test control unit 24 by controlling the exchange unit selection unit 11. Type 1 ground), the resistance and voltage (hereinafter referred to as the supply voltage) in the state that the voltage is supplied to the line for each measurement terminal is measured and output in series to the test control unit 24 (S130).

In addition, the digital multimeter unit 15 has a measurement terminal selected by the test control unit 24 under the control of the test control unit 24 for the measurement terminal selected by the test control unit 24 by controlling the exchange unit selection unit 11. The voltage applied to the test load in the measurement function selector 14 (hereinafter referred to as “discharge voltage”) is measured and output in series to the test control unit 24 in the discharge state generated when the voltage is supplied to and then cut off (S140). ).

The test control unit 24 calculates the capacitance of the line using the discharge voltage data input from the digital multimeter unit 15 (S150).

In addition, the test control unit 24 comprehensively determines the state of the line by the line determination program prepared based on the capacitance, resistance, and supply voltage of the subscriber line (S160).

4 is a floor chart showing a method for conducting a call test between an operator and a subscriber or a line tester and an operator according to the present invention.

Referring to FIG. 4, the test control unit 24 selects an exchange unit in which the subscriber line to be tested is accommodated according to the test request message of the private exchange control unit or the operator, and sets the exchange unit selection unit 11 to the first hybrid circuit unit ( 12) and cut off by the measurement function selector 14, the subscriber line, the exchange unit selector 11, the first hybrid circuit unit 12, the first codec circuit 13, and the second codec circuit ( 16), the second hybrid circuit 17 and the call test circuit connected to the operator telephone is configured (S210).

Under the control of the test control unit 24, a ring signal (call tone) is transmitted to the operator's telephone and the subscriber's telephone or the tester's telephone connected to the operator's telephone and the subscriber line (S220).

The subscriber and the operator or the operator and the line tester who received the ring signal carry out a telephone test (S230).

Fig. 5 is a floor chart showing a method of testing a failure state of a telephone for transmitting a dial pulse to a digit according to the present invention.

Referring to FIG. 5, the test control unit 24 selects an exchange unit in which a line to be tested is accommodated according to a test request message of a private exchange control unit or an operator, and sets the exchange unit selection unit 11 to the first hybrid circuit unit 12. Dial pulse test circuit connected to the subscriber telephone, subscriber line, switching unit, switching unit selection unit 11, interrupt conversion unit 16, and test control unit 24 by disconnecting the measurement function selection unit 14 Configure (S310).

The subscriber and the operator maintains the call test state, and the subscriber sends out the digits of the phone in pulse form according to the operator's instructions (S320).

The transmitted dial pulse is input to the interrupt converter 16 through the exchange unit selector 11 (S330).

The interrupt converter 16 outputs an interrupt signal to the test control unit 24 by converting a dial pulse having a -48 volt voltage difference into a pulse having a TTL level voltage difference (S340).

The test control unit 24 calculates the number of digits sent and the make rate by examining the number of pulses and the pulse width time (S350).

6 is a floor chart showing a method of testing a fault condition of a telephone for transmitting a complex frequency tone to a digit according to the present invention.

Referring to FIG. 6, the test control unit 24 selects an exchange unit in which a line to be tested is accommodated according to a test request message of a private exchange control unit or an operator, and sets the exchange unit selection unit 11 to the first hybrid circuit unit 12. ), And cut off by the measurement function selector 14 to block subscriber phone, subscriber line, exchange unit, exchange unit selector 11, automatic gain adjustment unit 16, tone reception analyzer 20 and test control unit 24 ) Or subscriber telephone, subscriber line, switching unit, switching unit selecting unit 11, automatic gain adjusting unit 16, filter unit 21, frequency converting unit 22, DC voltage converting unit 23, and digital multimeter A complex frequency tone test circuit connected to the unit 15 is configured (S410).

The subscriber and the operator maintains the call test state, and according to the operator's instructions, the subscriber transmits the digits of the telephone in the form of a complex frequency tone (S420).

The transmitted complex frequency tone is input to the first hybrid circuit unit 12 through the exchange unit selection unit 11 (S430).

The DC component of the complex frequency tone is removed from the first hybrid circuit unit 12 and then output to the automatic gain adjusting unit 19 (S440).

The automatic gain adjusting unit 19 adjusts the gain of the complex frequency tone and outputs it to the tone receiving analyzer 20 and the filter unit 21 (S450).

The tone reception analyzer 20 converts the complex frequency tone into a digital signal by an AC / DC converter and outputs it to the test controller 24 (S460).

The test control unit 24 determines the digits sent out using the determination table programmed in advance (S470).

The filter unit 21 removes components other than the entire frequency band of the complex frequency used in the phone and outputs the components to the frequency converter 22 (S480).

The frequency converter 22 extracts only the pure complex frequency component corresponding to the digit from the complex frequency tone and outputs it to the DC voltage converter 23 (S490).

The DC voltage converting unit 23 converts the AC effective value voltage of the complex frequency tone into a tributary voltage and outputs it to the digital multimeter unit 15 (S550).

The digital multimeter unit 15 measures the DC voltage component and outputs the measured data in series to the test control unit 24 (S510).

7 is a floor chart showing a subscriber line identification test method according to the present invention.

Referring to FIG. 7, the test control unit 24 selects an exchange unit in which a line to be tested is accommodated according to the test request message of the private exchange control unit or the operator, and sets the exchange unit selection unit 11 to the first hybrid circuit unit 12. ) And cut off by the side bottom function selector 14, and the subscriber line, the exchange unit, the exchange unit selector 11, the first hybrid circuit unit 12, the first codec circuit unit 13, and the sound generator ( 18) configure a subscriber identification test circuit connected to (S610).

The loudness generating unit 18 transmits the loud sound to the subscriber line to be checked (S620).

The line tester connects the telephones to the subscriber line in turn and checks the subscriber line where the sound is heard (S630).

An embodiment of a subscriber test apparatus according to the present invention will be described.

The frequency converter 22 compares an applied AC input voltage with a reference voltage to trigger a one shot timer to turn on / off a switching current source and to turn on / off the switching current source. Charge / discharge of the internal capacitance occurs, and accordingly, the collector output of the output transistor converts and outputs a frequency pulse string, thereby implementing a voltage-to-frequency converter that generates an output frequency proportional to the input voltage.

The DC voltage converter 23 may be implemented as a RMS-to-DC converter for converting an effective value of an applied AC input into a DC voltage.

The filter unit 21 passes a frequency filter up to 4 kHz through a triple filter that can operate as a band pass filter, a low pass filter, or a notch filter. It can be implemented by operating as a low pass filter.

The tone reception analyzer 20 receives an input DTMF signal through an internal frequency filter configured with an analog / digital converter according to the frequency of the corresponding digit for the input dual tone premise (DTMF). It can be implemented with a DTMF decoder that converts and outputs the digital value of the bit.

The digital multimeter unit 15 may be implemented as a digital multimeter capable of measuring AC voltage, DC voltage, resistance, capacitance, and the like and outputting the serial data.

The automatic gain adjusting unit 19 may be implemented as an attenuation compensation operational amplifier.

The selective connection with the exchange unit of the exchange unit selector 11, the selective connection with the measurement function selector 14 or the first hybrid circuit unit 12 can be implemented using a relay.

The measurement terminal selection connection of the measurement function selector 14, the selection connection of the measurement item, the supply or interruption of the voltage to the subscriber line can implement a relay, and the test resistance is larger than the line resistance, so that the discharge voltage applied to the line resistance is used for the test. It can be ignored compared to the discharge voltage applied to the resistance.

The first hybrid circuit unit 12 and the second hybrid circuit unit 17 may be implemented as a hybrid transformer.

The interrupt converter 16 may be implemented as a DC-to-DC converter capable of converting a -48 volt voltage into a +5 volt voltage.

The first codec circuit unit 13 and the second codec circuit unit 16 may be implemented using a general codec that performs functions of an encoder and a decoder.

By measuring the distribution resistance and capacitance of the subscriber line as well as the voltage applied to the subscriber line, it is possible to accurately test the failure state of subscriber lines of different lengths, and to use the dial or complex frequency tone of the subscriber telephone. It is possible to know the transmission status of the subscriber, call test between subscriber and operator or operator and track field personnel, and track site personnel can check specific subscriber line.

Claims (7)

A test control unit 24 for controlling all operations of the test apparatus and processing the measurement data to determine test results; An exchange unit selector 11 configured to configure a test circuit for each test type, to select an exchange unit, to select a tip / ring or a ground wire under the control of the test control unit 24, and to be directly connected to the test subscriber line; A side-lowering power selector 14 including a test resistor connected to the exchange unit selector 11 and supplying or blocking a voltage to the line under the control of the test control unit 24 and selecting a measurement item; A first hybrid circuit portion 12 connected to the exchange unit selector 11 to block passage of a DC component of a signal and to connect a two-wire and four-wire communication paths; A first codec circuit part 13 and a second codec circuit part 16 connected in series with the first hybrid circuit part 12 to convert an analog signal and a digital signal to each other; A second hybrid circuit portion 17 connected to the second codec circuit portion 16 to block passage of a DC component of a signal and to connect a two-wire and four-wire communication paths; An interrupt converter 16 connected to the exchange unit selector 11 for converting a potential difference of a dial pulse to a TTL level and outputting an interrupt signal to the test controller 24; An automatic gain adjusting unit (19) connected to the first hybrid circuit unit (12) for adjusting the magnitude of a signal; A tone receiving analyzer 20 connected to the automatic gain adjusting unit 19 for converting a complex frequency tone into digital; A filter unit 21 connected to the automatic gain adjusting unit 19 for removing components other than the entire band of the complex frequency tone used in the telephone; A frequency converter (22) connected to the filter unit (21) for extracting only pure complex frequency components corresponding to the transmitted digits; A DC voltage converter 23 connected to the frequency converter 22 for converting an AC effective value voltage of the complex frequency tone into a DC voltage; A sound generating unit 18 connected between the first codec circuit unit 13 and the second codec circuit unit 16 to generate sound; And a digital multimeter unit 15 connected to the DC voltage converter 23 and the measurement function selector 14 to measure test data and output the measured data to the test control unit 24 in series. Subscriber test apparatus, characterized in that. The subscriber test apparatus according to claim 1, further comprising a serial input / output unit (25) connected between the test control unit (24) and an exchange system control unit or an operator terminal to transmit a test request, a response message, and the like. According to the test request message of the private exchange control unit or the operator, the test control unit 24 selects an exchange unit containing the subscriber line to be tested, and connects the exchange unit selector 11 to the measurement function selector 14, The first hybrid circuit unit 12 is disconnected and connected to a subscriber line, an exchange unit, an exchange unit selector 11, a measurement function selector 14, a digital multimeter unit 15, and a test controller 24. Constructing a line state test circuit (S110); The measurement function selection unit 14 selects a measurement item under the control of the test control unit 24 (S120); The digital multimeter unit 15 measures resistance and supply voltage in a state in which a voltage is supplied to the line for each measurement step with respect to the measurement terminal selected by the test control unit 24 by controlling the exchange unit selection unit 11. Outputting in series to the test control unit 24 (S130); In the digital multimeter unit 15, the measurement function selection unit 14 is connected to the track under the control of the test control unit 24 with respect to the measurement unit selected by the test control unit 24 by controlling the exchange unit selection unit 11. Measuring the discharge voltage applied to the test load in the measurement function selection unit 14 in the discharge state generated when the supply voltage is supplied and then interrupting the output voltage in series to the test control unit 24 (S140); The test control unit 24 calculates the capacitance of the line by using the discharge voltage data input from the digital multimeter unit 15 (S150); The test control unit 24 is a line state test method comprising the step (S160) of comprehensively determining the state of the line by the line determination program prepared based on the capacitance, resistance and supply voltage of the subscriber line. According to the test request message of the private exchange control unit or the operator, the test control unit 24 selects an exchange unit in which the subscriber line to be tested is accommodated, and connects to the first hybrid circuit unit 12 of the exchange unit selection unit 11. Blocked by the measurement function selection section 14, the subscriber line, the switching unit selection section 11, the first hybrid circuit section 12, the first codec circuit 13, the second codec circuit 16, the second hybrid Constructing a call test circuit connected to the circuit 17 and the operator switcher (S210); Transmitting a ring signal to an operator telephone and a subscriber telephone or an operator telephone connected to an operator telephone and a subscriber line under the control of the test control unit 24 (S220); Subscriber and operator or operator and the line tester receiving the ring signal is a call test method comprising the step of receiving a call test (S230). According to the test request message of the private exchange controller or the operator, the test control unit 24 selects an exchange unit in which the line to be tested is accommodated, and connects the exchange unit selector 11 to the first hybrid circuit board 12. Blocking the measurement function selection unit 14 to configure a dial pulse test circuit connected to the subscriber telephone, subscriber line, switching unit, switching unit selection unit 11, interrupt conversion unit 16 and test control unit 24 (S310) and; The subscriber and the operator while maintaining the call test state, the subscriber transmits the digits of the telephone in the form of a pulse according to the operator's instructions (S320); The transmitted dial pulse is input to the interrupt conversion unit 16 through the exchange unit selection unit 11 (S330); The interrupt converter 16 outputs an interrupt signal to the test controller 24 by converting a dial pulse having a -48 volt voltage difference into a pulse having a TTL level voltage difference (S340); The test control unit 24 is configured to calculate the number of pulses and the pulse width time to calculate the number of digits sent and the make rate (S350) for testing the failure state of the telephone to send the dial pulse to the digits, characterized in that Way. According to the test request message of the private exchange control unit or the operator, the test control unit 24 selects an exchange unit in which the line to be tested is accommodated, connects the exchange unit selection unit 11 to the first hybrid circuit unit 12, and measures it. The function selection unit 14 blocks the subscriber telephone, subscriber line, exchange unit, exchange unit selection unit 11, automatic gain adjustment unit 16, tone reception analyzer 20 and test control unit 24 or subscriber telephone, To subscriber line, exchange unit, exchange unit selector 11, automatic gain adjuster 16, filter 21, frequency converter 22, DC voltage converter 23 and digital multimeter 15 Constructing a complex frequency tone test circuit to be connected (S410); The subscriber and the operator while maintaining the call test state, the subscriber sends out the digits of the telephone in the form of a complex frequency tone according to the operator's instructions (S420); The transmitted complex frequency tone is input to the first hybrid circuit unit 12 through an exchange unit selection unit 11 (S430); A step S440 of outputting the DC component of the complex frequency tone from the first hybrid circuit unit 12 to the automatic gain adjusting unit 19; The automatic gain adjusting unit 19 adjusts the gain of the complex frequency tone and outputs it to the tone receiving analyzer 20 and the filter unit 21 (S450); The tone reception analyzer 20 converts the complex frequency tone into a digital signal by an AC / DC converter and outputs it to the test control unit 24 (S460); The test control unit 24 determines the transmitted digits by using a determination table preprogrammed (S470); The filter unit 21 is a step (S480) to remove the components other than the full frequency band of the complex used in the phone and output to the frequency converter (22); The frequency converter 22 extracts only the pure complex frequency component corresponding to the digit from the complex frequency tone and outputs it to the DC voltage converter 23 (S490); The DC voltage converting unit 23 converts the AC effective value voltage of the complex frequency tone into a DC voltage and outputs it to the digital multimeter unit 15 (S500); The digital multimeter unit 15 comprises a step (S510) of measuring the DC voltage component and outputting the measured data in series to the test control unit 24. How to test your condition. According to the test request message of the private exchange control unit or the operator, the test control unit 24 selects an exchange unit containing the line to be tested, connects the exchange unit selection unit 11 to the first hybrid circuit unit 12, and measures A subscriber connected to the subscriber line, the exchange unit, the exchange unit selection unit 11, the first hybrid circuit unit 12, the first cordec circuit unit 13, and the sound generating unit 18 by being cut off by the function selection unit 14. Constructing a confirmation test circuit (S610); The loudness generating unit 18 transmits the loudness to the subscriber line to be checked (S620); The line tester is connected to the subscriber line in turn, the subscriber line confirmation test method characterized in that it comprises a step (S630) to check the subscriber line to hear the voice.