KR100192902B1 - User testing apparatus of telephone communication - Google Patents

Abstract

It is an object of the present invention to provide a subscriber testing apparatus capable of performing a line state test, a dial pulse of a telephone, or a transmission state test of a composite frequency tone.

The subscriber testing apparatus according to the present invention includes a test control unit (24); An exchange unit selection unit (11) for constructing a test circuit for each test type under the control of the test control unit (24); A measurement function selection unit (14) connected to the exchange unit selection unit (11); A first hybrid circuit section (12) connected to the exchange unit selection section (11); A first CODEC circuit section 13 and a second CODEC circuit section 16 connected in series to the first hybrid circuit section 12; A second hybrid circuit section (17) connected to the second codec circuit section (16); An interrupter converting unit (16) connected to the switching unit selection unit (11); An automatic gain adjustment unit (19) connected to the first hybrid circuit unit (12); A tone reception analysis unit (20) connected to the automatic gain adjustment unit (19); A filter section (21) connected to the automatic gain adjusting section (19); A frequency converter 22 connected to the filter unit 21; A DC voltage converting section (23) connected to the frequency converting section (22); A tongue generation 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 conversion unit 23 and the measurement function selection unit 14, respectively.

By doing so, it is possible to measure the resistance and capacitance distributed in the subscriber line and to use it in the determination of the line failure state.

Description

Subscriber test equipment and method that can perform line state test, telephone digit test, etc.

The present invention relates to a private branch exchange operator facility, and more particularly to a test apparatus and method for testing the condition of a subscriber line and a telephone set.

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

FIG. 1 is a functional block diagram of a circuit for testing whether a conventional subscriber line condition and a telephone is mounted.

1 is a circuit diagram of a polarity inverting circuit unit 1 connected to a subscriber line to be tested and inverting a voltage supplied to a subscriber line, (3) for measuring a change in the voltage distributed in the distribution voltage circuit part (2), and a voltage measuring circuit part (3) for measuring the data measured by the differential voltage measurement circuit part (3) And a test controller 5 (5) for reading the digital data converted by the AC / DC converter 4 and storing the converted digital data in a memory in order, and determining whether the line is broken or connected to the telephone set And a serial input / output circuit unit 6 for transmitting a test request and response message between the test control unit 5 and the exchange system.

1, a voltage of -48 volts supplied from the exchanger charges the capacitors of the line and the telephone via the test resistor in the voltage distribution circuit unit 2. In this case,

The post-charge test control unit 5 operates the relay in the polarity inversion circuit unit 1 to reverse the polarity of the voltage supplied to the subscriber line.

The differential amplifier in the differential voltage measurement circuit unit 3 amplifies the difference in voltage across the test resistor in the discharge state through the capacitor in the line and the telephone as the polarity is inverted.

The AC / DC conversion unit 4 converts the difference between the amplified voltages into digital data and outputs the digital data to the test control unit 5.

The test control unit 5 reads the converted digital data and sequentially stores the read digital data in the memory.

Continue the measurement until the voltage applied to the test resistor becomes zero to judge the type of failure of the line, such as ground or disconnection.

The method of testing whether or not a subscriber's telephone is installed according to the configuration of FIG. 1 is the same as that of the subscriber line state testing method, but it is determined whether or not the telephone is mounted by analyzing a discharge voltage value that varies with time in the discharging process.

The subscriber line and telephone condition test should be able to measure the capacitance and resistance of the line depending on the length of the subscriber line and use it as the test data and to test the dispatch status of the dial pulse or the complex frequency tone of the telephone, In the conventional test method, only the voltage applied to the test resistor of the voltage distribution circuit is measured to judge the state of the line, so that different test results may be obtained for the same line state, and the state of dispatch of the dial pulse or the composite frequency tone of the telephone There is a problem that it can not be done.

An object of the present invention is to provide a subscriber line capable of performing a line state test for determining a line state by measuring a voltage, a resistance and a capacitance of a subscriber line, a transmission state test of a telephone dial pulse or a composite frequency tone, A test apparatus and a method therefor.

FIG. 1 is a functional block diagram of a conventional subscriber line state and a circuit for testing whether or not a telephone is mounted.

FIG. 2 is a functional block diagram of a subscriber testing apparatus according to the present invention; FIG.

FIG. 3 is a floor chart illustrating a method of testing a line condition according to the present invention; FIG.

FIG. 4 is a floor chart illustrating a method of testing a call between an operator and a subscriber or between a caller and an operator in accordance with the present invention.

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

FIG. 6 is a floor chart showing a method of testing a failure state of a telephone for transmitting a composite frequency tone according to the present invention to a digit. FIG.

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

FIG. 2 is a functional block diagram of the subscriber testing apparatus according to the present invention. FIG. 2 is a block diagram showing a configuration of a test circuit for each test type according to the control of the test control unit 24, a test control unit 24 for controlling all operations of the test apparatus, (11) for selecting a unit, a selection of a tip / ring or a ground line, and directly connected to a test subscriber line, and a test resistor connected to the exchange unit selection unit (11) A measurement function selection unit 14 for supplying or disconnecting a voltage to the line under the control of the control unit 24 and selecting a measurement item; A first CODEC circuit unit connected in series to the first hybrid circuit unit 12 for converting an analog signal and a digital signal into each other is connected to the first CODEC circuit unit 12, 13 and the first codec A second hybrid circuit part (17) connected to the second codec circuit part (16) for blocking the passage of the direct current component of the signal and connecting the two-wire communication path to the four-wire communication path, An interface conversion unit 16 connected to the selection unit 11 for converting the potential difference of the direct pulse to a TTL level and outputting an interrupting signal to the test control unit 24, A tone reception analyzer 20 connected to the automatic gain adjuster 19 for converting the complex frequency tone to digital, and an automatic gain adjusting unit 19 for adjusting the amplitude of the signal, A filter unit 21 connected to the filter unit 21 for removing components other than the entire band of the frequency band used for the telephone and a frequency extracting unit 22 for extracting only pure complex frequency components corresponding to the digit transmitted and connected to the filter unit 21, A conversion unit 22, A direct current voltage conversion section 23 connected to the first codec circuit section 13 and the second codec circuit section 16 for converting the AC effective value voltage of the complex frequency tone to a direct current voltage, And a measuring function selecting unit 14 connected to the DC voltage converting unit 23 and measuring function selecting unit 14 to measure test data and output the measured data in series to test control unit 24 And a power input / output unit 25 connected between the test control unit 24 and an exchange system control unit or an operator terminal for transmitting a test request, a response message, and the like.

The exchange unit (EU) refers to the module of the switching system to which the subscriber is directly connected. The type of the test is the line state test, the dial pulse of the telephone or the transmission test of the composite frequency tone, Items refer to line resistance, capacitance, and line voltage, respectively.

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

3, 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 branch exchange control unit or the operator, The exchange unit, the measurement function selection unit 14, the digital multimeter unit 15, and the test control unit 14 are connected to the first hybrid circuit unit 12 and the first hybrid circuit unit 12, And a line state test circuit connected to the 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 includes a measurement terminal (Tip and Ring), a tip, a first-class ground, a ring, and a first terminal, which are controlled by the test control unit 24 by controlling the switching unit selection unit 11. [ (Hereinafter referred to as supply voltage) in a state where a voltage is supplied to the line for each measurement terminal, and outputs it to the test control unit 24 in series (S130).

The digital multimeter unit 15 further includes a measurement function selection unit 14 for selecting a measurement terminal to be selected by controlling the exchange unit selection unit 11 by the test control unit 24 under the control of the test control unit 24. [ (Hereinafter referred to as discharge voltage) applied to the test load in the measurement function selection unit 14 in the discharge state occurring when the voltage supplied to the test control unit 24 is cut off and supplied to the test control unit 24 ).

The test control unit 24 calculates the electrostatic 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 line condition by a line determination program prepared based on the capacitance, resistance, and supply voltage of the subscriber line (S160).

FIG. 4 is a floor chart showing a method of performing a currency test between an operator and a subscriber or between a 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 PBX controller or the operator, and the exchange unit selector 11 is connected to the first hybrid circuit unit The first hybrid circuit unit 12, the first codec circuit 13, and the second codec circuit (not shown) via the subscriber line, the switching unit selection unit 11, the first hybrid circuit unit 12, 16, the second hybrid circuit 17 and the operator's telephone (S210).

(Ring tone) to the tester's telephone connected to the operator's telephone, the subscriber's telephone or the operator's telephone and the subscriber line under the control of the test control section 24 (S220).

The subscriber who received the ring signal, the operator or operator and the line tester take the telephone and perform a telephone test (S230).

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

5, the test control unit 24 selects an exchange unit in which a line to be tested is received according to a test request message of the private branch exchange control unit or the operator, and selects the exchange unit selection unit 11 as a first hybrid circuit unit 12 and connected to the subscriber telephone, the subscriber line, the exchange unit, the exchange unit selection unit 11, the interrupt conversion unit 16 and the test control unit 24 by interrupting the measurement function selection unit 14 Thereby forming a circuit (S310).

The subscriber and the operator keep the call test state and the subscriber transmits the digits of the telephone in pulse form according to the instruction of the operator (S320).

The transmitted direct pulse is input to the interrupt conversion unit 16 through the switching unit selection unit 11 (S330).

The interrupter conversion unit 16 converts the dial pulse having the voltage difference of -48 volts into a pulse having the voltage difference of the TTL level and outputs the interrupt signal to the test control unit 24 (S340).

The test controller 24 examines the number of pulses and the pulse width time, and calculates the transmitted digits and the make ratio (S350).

FIG. 6 is a flowchart showing a method of testing a failure state of a telephone for transmitting a composite frequency tone to a digit according to the present invention.

6, the test control unit 24 selects an exchange unit in which a line to be tested is received according to a test request message of the PBX controller or the operator, and selects the exchange unit selector 11 as the first hybrid circuit unit 12, and the measurement function selection unit 14 is cut off and the subscriber telephone, the subscriber line, the exchange unit, the exchange unit selection unit 11, the automatic gain adjustment unit 16, the tone reception analysis unit 20 and the test control unit 24, a subscriber line, a switching unit, a switching unit selection unit 11, an automatic gain control unit 16, a filter unit 21, a frequency conversion unit 22, a DC voltage conversion unit 23, And a composite frequency tone test circuit connected to the meter unit 15 (S410).

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

The transmitted composite frequency tone is input to the first hybrid circuit unit 12 through the switching unit selection unit 1 (S430).

After the direct current component of the composite frequency tone is removed in the first hybrid circuit section 12, it is output to the automatic gain adjustment section 19 (S440).

The automatic gain adjustment unit 19 adjusts the gain of the complex frequency tone and outputs the result to the tone reception analysis unit 20 and the filter unit 21 (S450).

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

The test control unit 24 determines the transmitted digit using the pre-programmed table (S470).

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

The frequency conversion unit 22 extracts only pure complex frequency components corresponding to the digits in the complex frequency tone and outputs the pure complex frequency components to the DC voltage conversion unit 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 the DC voltage to the digital multimeter unit 15 (S500).

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

FIG. 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 received according to a test request message of the private branch exchange control unit or the operator, and selects the exchange unit selection unit 11 as a first hybrid circuit unit 12, and is disconnected from the measurement function selection unit 14 so that the subscriber line, the exchange unit, the exchange unit selection unit 11, the first hybrid circuit unit 12, the first codec circuit unit 13, (S610), which is connected to the subscriber identity testing circuit 18.

The voice tone generation unit 18 transmits the voice memo to the subscriber line to be confirmed (S620).

The line tester connects the telephone to the subscriber line in turn and confirms the subscriber line where the subscription sound is heard (S630).

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

The frequency converting unit 22 compares the applied AC input voltage with a reference voltage to trigger a one shot timer to turn on / turn on the switching current source and turn on / off the switching current source. A voltage-to-frequency converter that generates charge and discharge of a capacitance and changes a collector output of the output transistor to generate a frequency pulse train to generate an output frequency proportional to an input voltage.

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

The filter unit 21 passes a frequency signal up to 4 KHz through a triple filter that can operate as a band pass filter, a low pass filter, or a notch filter. (Los Pass Filter) that can be implemented by using a low-pass filter.

The tone reception analysis unit 20 receives an input DTMF signal through an internal frequency filter composed of an analog / digital converter according to the frequency of each digit for the inputted dual tone multi-frequency (DTMF) (DTMF Decoder) that converts the digital value to a 4-bit digital value and outputs the digital value.

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

The automatic gain adjusting unit 19 can be implemented by an operational amplifier for attenuation compensation.

The selective connection with the exchange unit of the exchange unit selection unit 11 and the selective connection with the measurement function selection unit 14 or the first hybrid circuit unit 12 can be implemented using relays.

The connection of the measurement terminal selection by the measurement function selection unit 14, the selective connection of the measurement items, and the supply or cutoff of the voltage to the subscriber line can be implemented by using a relay. The test resistance is larger than the line resistance, Is negligible compared to the discharge voltage across the test resistor.

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

The interrupt converter 16 may be implemented as a DC to DC converter that can convert -48 volts to +5 volts.

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

It is possible to accurately test the failure state of the subscriber line having a different length by using the voltage and the distribution resistance of the subscriber line as well as the voltage applied to the subscriber line and measuring the capacitance and the capacitance of the subscriber line, And it is possible to test the call between the subscriber, the operator or operator and the line field personnel, and the line field personnel can confirm the specific line of the subscriber.

Claims (7)

A test control unit (24) for controlling all operations of the test apparatus, processing the measurement data to determine a test result; A switching unit selection unit (11) configured to configure a test circuit for each test type, select a switching unit, select a tip / ring or a ground line under the control of the test control unit (24), and directly connect to the test subscriber line; A measurement function selection unit 14 including a test resistor connected to the exchange unit selection unit 11 and supplying or cutting off a voltage to the line under the control of the test control unit 24 and selecting a measurement item; A first hybrid circuit part (12) connected to the switching unit selection part (11) for blocking a direct current component of a signal from passing therethrough and connecting the two-wire communication line and the four-wire communication line; A first CODEC circuit section 13 and a second CODEC circuit section 16 which are connected in series to the first hybrid circuit section 12 and convert analog signals and digital signals to each other; A second hybrid circuit unit (17) connected to the second codec circuit unit (16) to block the notification of the direct current component of the signal and to connect the two-wire and four-wire communication channels; An interface converting unit (16) connected to the switching unit selection unit (11) for converting a potential difference of the direct pulse to a TTL level and outputting an interrupting signal to the test control unit (24); An automatic gain adjustment unit (19) connected to the first hybrid circuit unit (12) and adjusting a signal size; A tone reception analyzer (20) connected to the automatic gain controller (19) for converting the complex frequency tone to digital; A filter unit (21) connected to the automatic gain adjustment unit (19) for removing components other than the entire band of the composite frequency tone used in the telephone; A frequency conversion unit 22 connected to the filter unit 21 and extracting pure complex frequency components corresponding to the transmitted digit; A DC voltage converting unit (23) connected to the frequency converting unit (22) for converting an AC effective value voltage of the complex frequency tone to a DC voltage; A voice recognition unit (18) connected between the first codec circuit unit (13) and the second codec circuit unit (16) to generate a voice signal; And a digital multimeter unit 15 connected to the DC voltage conversion unit 23 and the measurement function selection unit 14 to measure test data and output the measured data in series to the test control unit 24 Wherein the subscriber test apparatus comprises: 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 for transmitting a test request, a response message and the like. The test control unit 24 selects the exchange unit in which the subscriber line to be tested is accommodated according to the PBX control unit or the operator's test request message and connects the exchange unit selection unit 11 to the measurement function selection unit 14 The first hybrid circuit unit 12 is connected to the subscriber line, the switching unit, the switching unit selection unit 11, the measurement function selection unit 14, the digital multimeter unit 15 and the test control unit 24 Constructing a line condition test circuit (S110); The measurement function selection unit 14 includes a step (S120) of selecting a measurement item under the control of the test control unit 24; The digital multimeter unit 15 measures the resistance and the supply voltage in the state where the voltage is supplied to the line for each measurement terminal with respect to the measurement terminal selected by controlling the exchange unit selection unit 11 by the test control unit 24 And outputting the test result to the test control unit 24 in series (S130); The digital multimeter unit 15 is configured such that the measurement function selection unit 14 is connected to the measurement terminal by the test control unit 24 under the control of the test control unit 24 for the measurement terminal selected by controlling the exchange unit selection unit 11. [ A step (S140) of measuring a discharge voltage applied to the test load in the measurement function selection unit 14 and outputting the measured discharge voltage in series to the test control unit 24 in a discharge state occurring when the supplied voltage is supplied and then shut off; The test control unit 24 calculates the electrostatic capacitance of the line using the discharge voltage data input from the digital multimeter unit 15 (S150); Wherein the test control unit (24) comprises a step (S160) of comprehensively determining the line condition by a line determination program prepared by using the capacitance, resistance, and supply voltage of the subscriber line as data. The test control unit 24 selects the exchange unit in which the subscriber line to be tested is received according to the test request message of the private branch exchange control unit or the operator and connects the exchange unit selection unit 11 to the first hybrid circuit unit 12 The measurement function selection unit 14 is cut off and the subscriber charter path, the switching unit selection unit 11, the first hybrid circuit unit 12, the first codec circuit 13, the second codec circuit 16, Configuring a call test circuit connected to the circuit 17 and the operator telephone (S210); A step S220 of sending a ring signal to the tester telephone connected to the operator telephone and the subscriber telephone or the operator telephone and the subscriber line under the control of the test control section 24; And a step (S230) of carrying out a call test with the subscriber, the operator or the operator who has received the ring signal, and the line tester carrying the telephone. The test control unit 24 selects the exchange unit in which the line to be tested is accommodated and connects the exchange unit selection unit 11 to the first hybrid circuit unit 12 according to the test request message of the private branch exchange control unit or the operator, A step of configuring a direct pulse test circuit connected to the subscriber telephone, the subscriber line, the exchange unit, the exchange unit selection unit 11, the interrupt conversion unit 16 and the test control unit 24 by blocking the function selection unit 14 S310); (S320) of sending the digit of the telephone in the form of a pulse according to the instruction of the operator while keeping the subscriber and the operator in the call test state; A step S330 of inputting the transmitted direct pulse to the interrupt conversion unit 16 through the switching unit selection unit 11; The interrupter conversion unit 16 converts the dial pulse having the voltage difference of -48 volts into a pulse having the voltage difference of the TTL level and outputs the interrupt signal to the test control unit 24 (S340). The test control unit 24 comprises a step of counting the number of pulses and the pulse width time, and calculating the transmitted digit and the make ratio (S350). The test control unit 24 tests the failure state of the telephone for transmitting a dial pulse to the digit Way. The test control unit 24 selects the exchange unit in which the line to be tested is accommodated and connects the exchange unit selection unit 11 to the first hybrid circuit unit 12 according to the test request message of the private branch exchange control unit or the operator, A switching unit, an exchange unit selection unit 11, an automatic gain adjustment unit 16, a tone reception analysis unit 20 and a test control unit 24 or a subscriber telephone set, a subscriber line, A switching unit selection unit 11, an automatic gain adjustment unit 16, a filter unit 21, a frequency conversion unit 22, a DC voltage conversion unit 23 and a digital multimeter unit 15 Constructing a combined frequency tone test circuit to be connected (S410); The subscriber and the operator maintain the telephone test state and transmit the digit of the telephone in the form of a complex frequency tone according to an instruction of the operator (S420); The transmitted composite frequency tone is input to the first hybrid circuit unit 12 through the switching unit selection unit 11 (S430); (S440) after the direct current component of the complex frequency tone is removed from the first hybrid circuit section 12 and then output to the automatic gain adjustment section 19; The automatic gain adjustment unit 19 adjusts the gain of the complex frequency tone and outputs the adjusted gain to the tone reception analysis unit 20 and the filter unit 21 (S450). The tone reception analyzing unit 20 converts the complex frequency tone into a digital signal by an AC / DC converter and outputs the digital signal to the test controller 24 (S460). The test control unit 24 includes a step (S470) of judging the transmitted digit using a preprogrammed pre-programmed table; The filter unit 21 removes components other than the entire complex frequency band used in the telephone and outputs the components to the frequency conversion unit 22 (S480). The frequency converting unit 22 extracts only pure complex frequency components corresponding to the digits in the complex frequency tone and outputs the pure complex frequency components to the DC voltage converting unit 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 measures a DC voltage component and outputs the measured data to the test control unit 24 in series (S510). How to test the condition. The test control unit 24 selects the exchange unit in which the line to be tested is received according to the test request message of the private branch exchange control unit or the operator and connects the exchange unit selection unit 11 to the first hybrid circuit unit 12 The switching unit is connected to the subscriber line, the switching unit, the switching unit selection unit 11, the first hybrid circuit unit 12, the first codec circuit unit 13, and the voice recognition unit 18 while being blocked by the function selection unit 14 Constructing a subscriber identity test circuit (S610); The voice tone generation unit 18 transmits a voice memo to the subscriber line to be confirmed (S620); And the step of connecting the telephone to the subscriber line and confirming the subscriber line in which the subscriber's voice is heard (S630).