KR100781489B1 - Terminal device for diagnosing failure of transmission line and method of diagnosing failure of transmission line and measuring distance thereof - Google Patents

Abstract

A terminal for diagnosing failure of a communication line and a method for diagnosing the failure of the communication line as measuring a distance by using the terminal are provided to decide disconnected/short states of the line as exactly measuring a distance to a disconnected spot or a short spot, through a simple configuration based on previously inputted communication line parameters and measured line voltages. If a line state diagnosis menu key is inputted, a line connector(130) selects either a tip line or a ring line or a ground line to connect the selected line. A voltage measurer(120) applies a predetermined voltage to the selected line, and measures line voltages by selectively connecting plural resistance elements having different resistances. A program storage(113) stores a program which calculates line resistance based on the measured voltage, operates a short distance if the calculated resistance is smaller than predetermined resistance, calculates capacitance if the calculated resistance is larger, and which operates a disconnected distance if the capacitance is larger than a predetermined value. A resistance DB(114) stores resistance per unit length, and stores reference resistance compared with the calculated line resistance. A capacitance DB(115) stores capacitance per unit length, and stores reference capacitance compared with the calculated capacitance. A comparator(116) compares the calculated line resistance or capacitance with the reference resistance or the reference capacitance.

Description

Terminal for diagnosing failure of transmission line and method of diagnosing failure of transmission line and measuring distance

1 is a block diagram of a communication line failure diagnosis terminal according to an embodiment of the present invention.

FIG. 2 is a detailed block diagram of the voltage measuring unit in FIG. 1.

FIG. 3 is a detailed block diagram of the resistance selector in FIG. 2.

FIG. 4 is a detailed block diagram of the resistance unit in FIG. 2.

FIG. 5 is a detailed block diagram of the program storage unit in FIG. 1.

6 is a flowchart illustrating a communication line failure diagnosis and distance measuring method according to an embodiment of the present invention.

7 is a flowchart illustrating a communication line failure diagnosis and a distance measuring method according to another embodiment of the present invention.

8 is an external perspective view of a communication line failure diagnosis terminal according to an embodiment of the present invention.

9 is an exemplary diagram of line parameters displayed on a display unit according to an exemplary embodiment of the present invention.

           Explanation of symbols on the main parts of the drawings

100; Communication line fault diagnosis terminal according to the present invention

110; MPU 111; A / D D / A Converter

112; Control unit 113; Program storage

114; Resistance database 115; Capacitive database

116; Comparator 117; timer

118; Buffer 120; Voltage measuring part

130; Line connection 132; Ringer

140; Display unit 150; Key input

160; Phone circuit section 170; LAN interface

180; Charging circuit section 182; Power supply

202; Power supply unit 204; Resistance selector

206; Resistance section 208; Line voltage output stage

502; Line resistance calculator 504; Short Circuit Distance Calculator

506; Capacitance calculation unit 508; Single line distance calculation unit

The present invention relates to a communication line failure diagnosis terminal, and in particular, it is possible to determine whether the communication line is short-circuit or disconnection based on pre-input data and calculation program, and to measure the distance to the short-circuit or disconnection point simply and accurately. The present invention relates to a communication line failure diagnosis terminal, and a communication line failure diagnosis and a distance measuring method using the same.

In general, the communication line is connected to the subscriber through the underground pipeline and ground poles through a complicated connection process at the telephone exchange.

In order to troubleshoot such a communication line, a line maintenance worker carries out or carries various heavy equipments for testing in the field, or asks the laboratory staff of a telephone station to be notified of the good condition and failure state of the line. After the work was performed.

Transporting, carrying, and troubleshooting such heavy, bulky equipment not only reduces maneuverability, but also takes a lot of work time, or brings overwork to laboratory personnel, causing inconvenience to wait until the end of the test.

In order to solve the above problems, a portable line test phone has been developed that allows the operator of a line to make trouble handling by determining the state of the line such as call, call, telephone capacity, disconnection, short circuit, insulation resistance, etc. .

However, the conventional portable line test phone is not only bulky and difficult to implement because it is composed of complicated circuits, but also has many problems due to frequent failures.

In addition, the conventional portable line test phone had a problem that it could not measure the exact distance to the point of failure, that is, disconnection point and short circuit point.

The present invention was created to solve the problems of the prior art as described above, and an object of the present invention is to determine a disconnection / short circuit state of a communication line by a simple configuration based on a previously input communication line specification and a measured line resistance. At the same time, the present invention provides a communication line fault diagnosis terminal capable of accurately measuring a distance to a disconnection point and a short circuit point, and a communication line fault diagnosis and distance measuring method using the same.

Another object of the present invention is a communication line failure diagnosis terminal and a communication line failure diagnosis and distance measurement using the same so as to make it possible to immediately know whether the line repair is completely performed by talking to the subscriber or the exchange after the line inspection and repair. To provide a way.

The communication line fault diagnosis terminal of the present invention for achieving the above object, the line state check menu key is input 'key input unit' is a predetermined parameter is input, the line state check menu key input from the key input unit is input 'Line connection part' that selects and connects the corresponding line among tip line, ring line and ground line, and selectively connects a plurality of resistance elements each having a different resistance by applying a predetermined voltage to the line selected by the line connection part. 'Voltage measuring unit' for measuring line voltages, 'A / DD / A converter' for converting analog signals measured by the voltage measuring unit into digital signals or converting digital signals into analog signals (Analog / Digital Digital) / Analog Converter), calculates the line resistance based on the line voltage measured by the voltage measuring unit, and the calculated line resistance is smaller than the predetermined resistance. In the case, the short circuit distance is calculated. If the calculated line resistance is larger than the predetermined resistance, the capacitance is calculated. If the calculated capacitance is smaller than the predetermined value, the program storage unit stores a program for calculating the disconnection distance. The 'resistance per unit length' is stored according to the type of communication line, the 'resistance database' which stores the reference resistance which is the reference for comparison with the calculated line resistance, and the 'outage per unit length' according to the type of communication line 'Capacitance database' which stores the reference capacitance which is stored as a reference for comparison with the calculated capacitance, and a comparison unit for comparing the calculated line resistance or capacitance with the reference resistance or the reference capacitance. And a timer for counting time, and checking the track status based on the input of the track status check menu key of the key input unit. Executing a program stored in the unit, and is characterized in that the configuration including a power supply for supplying a display unit, and the power data and the measured values displayed by the control of the controller, the controller for controlling the entire device configuration.

The communication line failure diagnosis and distance measuring method using the communication line failure diagnosis terminal of the present invention for achieving the above object, the step of inputting the line status check menu key, the control unit is connected to the line connection based on the line status check menu key Connecting the corresponding communication line by driving control, and when the corresponding communication line is connected, measuring a line voltage of the communication line by applying a predetermined voltage under the control of the controller, based on the measured voltage Calculating a line resistance, comparing the calculated line resistance with a preset reference resistance, and if the line resistance measured by the comparison is smaller than a preset reference resistance, displaying “short circuit” on the display unit. After the "short circuit" indication, the "line parameter" stored in the "resistance database" is displayed on the display. And determining whether a parameter coinciding with the displayed line parameter is input after displaying the line parameter, and when a parameter coinciding with the line parameter displayed by the comparison determination is input, corresponding to the corresponding line parameter And calculating a short circuit distance by executing a program stored in the short circuit distance calculator based on the stored resistance per unit length, and displaying the calculated short circuit distance on the display unit.

Next will be described in detail with reference to the accompanying drawings a preferred embodiment of the communication line fault diagnosis terminal and a communication line fault diagnosis and distance measuring method using the present invention.

1 is a block diagram of a communication line failure diagnosis terminal 100 according to an embodiment of the present invention, Figure 8 is an external perspective view of the communication line failure diagnosis terminal 100 is shown.

As shown in FIG. 1, the communication line failure diagnosis terminal 100 according to an exemplary embodiment of the present invention includes a key input unit 150, a line connection unit 130, and a voltage measurement unit 120. And the A / DD / A converter 111, the program storage 113, the resistance database 114, the capacitance database 115, the comparator 116, the timer 116, The control unit 112, the display unit 140, the charging circuit unit 180, the power supply unit 182, the ringer unit 132, the phone circuit unit 160, and the 'LAN interface unit 170' are included.

The 'key input unit' 150 inputs a line state check menu key and inputs line parameters such as capacitance per unit length, resistance per unit length, core thickness, and core type (resistance).

The line connection unit 130 is a tip line and a ring corresponding to the selected menu under the control of the control unit 112 when the line state check menu key input from the key input unit 150 is input. Select and connect the corresponding line among) and ground line.

For example, if a menu key for line condition check is input, the tip line and the ring line are connected to measure the line voltage and loop resistance. When the leakage current measurement menu key is input, the ground wire and the tip wire or the ground wire and the ring wire are connected.

The voltage measuring unit 120 measures a line voltage by selectively connecting an internal resistance to a line selected by the line connecting unit 130 and applying a predetermined voltage.

The 'A / D D / A converter 111 converts the analog signal measured by the voltage measuring unit 120 into a digital signal, or converts a digital signal which is a control signal of the controller 112 into an analog signal.

The program storage unit 113 calculates a line resistance based on the line voltage measured by the voltage measuring unit 120, and calculates a short circuit distance when the calculated line resistance is smaller than a predetermined resistance. When the line resistance is larger than the predetermined resistance, the capacitance is calculated. When the calculated capacitance is smaller than the predetermined value, a program for calculating the disconnection distance is stored.

The 'resistance database' 114 (also referred to simply herein as 'resistance DB' in this specification or drawing) is a memory of 'resistance per unit length' according to the type of communication line (that is, resistance per unit length corresponding to each communication line). 1 to 1) and store the reference resistance as a reference for comparison with the measured line resistance.

The 'capacitance database' 115 (also referred to simply herein as 'capacitance DB' in the present specification or drawing) stores a 'capacitance per unit length' according to the type of communication line (that is, a unit corresponding to each communication line). The capacitance per length is stored in a one-to-one correspondence), and the reference capacitance as a reference for comparison with the measured capacitance is stored.

The comparison unit 116 compares the line resistance or capacitance calculated by the control of the control unit 112 with preset reference resistance and reference capacitance.

The timer 116 is driven by the control of the control unit 112 to count the time (more specifically, the time when the charge charged in the disconnected line is discharged).

The control unit 112 executes a program stored in the program storage unit 113 to check the line state based on the line state check menu key input of the key input unit 150, and controls the overall configuration of the terminal. Output various control signals.

The controller 112 is preferably implemented by a central processor unit (CPU).

The display unit 140 displays data, an output value, and a line state under the control of the controller 112. The display unit 140 is preferably implemented with a liquid crystal device (LCD).

The charging circuit unit 180 receives a commercial power source and converts it into a DC (Direct Current) power source having a predetermined voltage and outputs the same.

The power supply unit 182 receives DC power from the charging circuit unit 180 to supply driving power to the components of the terminal.

The ringer unit 132 detects and outputs a ring signal input from an exchange.

The phone circuit unit 160 is a telephone circuit for talking to a subscriber or an exchange.

The 'LAN interface unit' 170 is an interface for data communication through a network.

The buffer 118 is where data or parameters input through the key input unit 140 are temporarily stored.

As shown in FIG. 1, the 'A / DD / A converter' 111, the controller 112, the program storage unit 113, the resistance database 114, the capacitance database 115, and the comparison unit The 116, the timer 117, and the buffer 118 are mounted on the MPU 110, and the MPU 110 is a component mounting board for mounting a configuration including the controller 112.

FIG. 2 shows a detailed block diagram of the voltage measuring unit 120 in FIG. 1, FIG. 3 shows a detailed block diagram of the resistance selection unit 204 in FIG. 2, and FIG. A detailed block diagram of the resistor portion 206 at 2 is shown.

As shown in FIG. 2, the voltage measuring unit 120 is one of the core components of the present invention, and includes a power supply unit 202, a resistor 206, a resistor selector 204, and a line voltage output terminal. '208'.

The power applying unit 202 applies a predetermined voltage, for example, 50V, to the communication line connected by the line connection unit 130 under the control of the control unit 112.

The resistor unit 206 is composed of a plurality of resistor elements each having a different resistance value. For example, as shown in FIG. 4, N resistors are configured, each resistor having N in resistance increasing by ₁ Hz, for example, R _in1 is 1 mA and R _in2 is 2 mA. Consists of dogs.

The resistance selector 204 sequentially selects the power supply unit 202 as the N resistance elements in the resistor unit 206 under the control of the 'switching control signal' received from the controller 112. Connect.

That is, the resistance selection unit 204 is composed of a plurality of switching elements (SW ₁ ... SW _N ) to sequentially switch SW ₁ ... SW _N in accordance with the switching control signal of the controller.

Of course, the switching device SW ₁ switches on / off the resistor element R _in1 ( _{1 s} ), and the switching device SW ₂ switches on / off the resistor element R _in2 (2 s).

The line voltage output terminal 208 outputs a line voltage of a communication line connected by switching of the resistance selector 204, and the output line voltage is controlled through an 'A / DD / A converter' (111). Inputted to 112, the control unit 112 recognizes the voltage value.

The voltage measuring unit 120 will be described in more detail.

When R _in1 (1㏀) is initially connected with the communication line, when the line voltage measurement value of the communication line is too large to exceed the range of binary data that the control unit 112 can process, that is, overflow In case of occurrence, the control unit 112 outputs a switching control signal to the switch element SW ₂ , turns on the switch element SW ₂ , and connects it with the line (at this time, driving the line off the switching element SW ₁ ). In this case, if an overflow occurs, the resistance element is sequentially increased by 1 ㏀ and connected to the line so as to fall within the range of the line voltage that the controller 112 can measure. Connect it.

Due to the configuration of the voltage measuring unit 120 as described above, it is possible to easily measure the voltage between lines even with a small bit operation.

FIG. 5 is a detailed block diagram of the program storage unit 113 of FIG. 1.

As shown in FIG. 5, the program storage unit 113 includes a line resistance calculator 502, a short circuit distance calculator 504, a capacitance calculator 506, and a disconnection distance calculator 508. do.

The line resistance calculator 502 calculates the line resistance of the communication line based on the communication line voltage measured by the voltage measuring unit 120 and the applied voltage. That is, the line resistance calculator 502 calculates the communication line line resistance based on the communication line voltage and the applied voltage measured according to Ohm's law and the voltage distribution law.

The short circuit distance calculation unit 504 is a parameter of the line resistance calculated by the line resistance calculation unit 502 and the line of the line input from the key input unit 150, for example, the diameter and material of the core wire (ie, the specific resistance). Calculate the distance to the short-circuit point based on 'or'resistance per unit length'.

The capacitance calculator 506 calculates the capacitance based on the discharge time of the voltage applied to the line under the control of the controller 112.

The disconnection distance calculator 508 calculates the distance to the disconnection point based on the capacitance calculated by the capacitance calculator 506 and the capacitance per unit length of the communication line input from the key input unit 150. .

The following describes a communication line failure diagnosis and distance measurement process using the terminal 100 according to the present invention having the configuration as described above.

6 is a flowchart illustrating a communication line failure diagnosis and a distance measuring method according to an embodiment of the present invention, and FIG. 7 is a flowchart illustrating a communication line failure diagnosis and a distance measuring method according to another embodiment of the present invention. 9 is an exemplary diagram of line parameters displayed on the display unit 140 according to an exemplary embodiment of the present invention.

First, the track state check menu key is input by the key input unit 150 (S610).

Then, the control unit 112 drives the line connection unit 130 based on the track state check menu key so that the line connection unit 130 connects the communication line, for example, the tip line and the ring line (S612).

When the corresponding communication line is connected, the voltage measuring unit 120 applies a predetermined voltage, for example, 50V, under the control of the control unit 112 to measure the line voltage of the communication line (S614 and S616).

The process of detecting the line voltage will be described in more detail.

The applied voltage of 50 V is applied to the line and the first resistor R _in1 ( ₁ kV) connected in series with the line, in which the voltage is distributed in proportion to the magnitude of the line resistance and the resistance of R _in1 ( ₁ kV). .

When the measured line voltage overflows in the control unit 112, the control unit 112 outputs a switching control signal to the resistance selection unit 204 to sequentially increase the resistance of the resistance element of the resistance unit by 1 ㏀. The height is switching control.

The controller 112 executes the program of the line resistance calculator 502, and the line resistance calculator 502 calculates the line resistance based on the measured line voltage input (S618).

When the line resistance is calculated as described above, the comparing unit 118 compares the calculated line resistance (for example, 100 mA) and the reference resistance (for example, 2 mA) stored in the resistance database 114. (S620).

When the line resistance measured by the comparison is smaller than the preset reference resistance, the display unit 140 displays "short circuit" under the control of the control unit 112 (S622).

After the " short circuit " display, the parameters of various types of communication lines stored in the resistance database 114, i.e., core thickness and material, are controlled by the control unit 112, as shown in FIG. The display unit 140 displays (S624).

After each line parameter of the various communication lines is displayed as described above, it is determined whether or not a parameter matching the displayed line parameter value is input (S626).

That is, when a unique number corresponding to a parameter of a communication line displayed on the display unit 140 is input through the key input unit 150, the controller 112 may identify a unique number corresponding to a plurality of parameters displayed on the display unit 150. Is determined to be input, reads the resistance value per unit length stored in the resistance database 114 in a one-to-one correspondence with the unique number, and then executes the program stored in the short-circuit distance calculating unit 504 to short-circuit the short circuit. Control to calculate the distance (S630).

On the other hand, when the communication line to be measured is not the same as the parameters of the communication line displayed on the display unit 140, the operator presses the 'direct input key button' provided in the key input unit 150.

When the direct input key is input, the controller 112 determines that a unique number corresponding to a plurality of parameters displayed on the display unit 150 is not input, and thus directly inputs a parameter value to the display unit 150. Display window. At this time, the operator directly inputs the parameter value of the communication line of the measurement target, for example, the resistance value per unit length (S628).

Since the resistance per unit length, which is a parameter directly input by the operator, is shown in the cable specification provided by the cable manufacturer, the value is easily understood.

When the resistance value per unit length of the communication line to be measured is directly input as described above, the control unit 112 executes a program stored in the short circuit distance calculating unit 504, and the short circuit distance calculating unit 504 is an input parameter. The short circuit distance is calculated based on the resistance value per unit length and the measured line resistance (S630).

Then, the calculated distance to the short-circuit point is displayed through the display unit 140 (S632).

On the other hand, when the measured and calculated resistance is greater than the predetermined reference resistance by comparing the calculated line resistance with the preset reference resistance, the power supply of a predetermined voltage applied to the communication line by the voltage measuring unit 120 is applied. Is blocked by the 'power-on blocking control signal' of the control unit 112 and at the same time by connecting a resistor in parallel to the communication line to discharge the charge charged in the communication line (S710, S712).

At the same time as the discharge, the timer 117 driven by the control of the control unit 112 counts the discharge time (S714).

The capacitance calculating unit S506 calculates the capacitance of the communication line based on the discharge time and the resistance counted by the timer 117.

The comparison unit 116 compares the calculated capacitance with a preset reference capacitance, and displays on the display unit 140 when the capacitance calculated by the comparison is smaller than the predetermined capacitance. If it is not less than the predetermined capacitance, the display unit 140 displays "normal" (S720, S740).

After the " disruption " display, the parameters of various types of communication lines, i.e., core thickness and material, stored in the capacitance database 115 under the control of the control unit 112, for example, are shown in FIG. As shown, the display unit 140 displays (S722).

After each line parameter of the various communication lines is displayed as described above, it is determined whether or not a parameter matching the displayed line parameter value is input (S724).

That is, when a unique number corresponding to a parameter of a communication line displayed on the display unit 140 is input through the key input unit 150, the controller 112 may identify a unique number corresponding to a plurality of parameters displayed on the display unit 150. Is determined to be input, reads the capacitance per unit length stored in the capacitance database 115 in correspondence with the unique number 1: 1, and then executes the program stored in the disconnection distance calculation unit 508, Control to calculate the disconnection distance (S728).

On the other hand, if the communication line to be measured is not the same as the parameters of the communication line displayed on the display unit 140, the operator presses the 'direct input key button' provided in the key input unit 150.

When the direct input key is input as described above, the controller 112 determines that a unique number corresponding to a plurality of parameters displayed on the display unit 150 is not input, and thus directly inputs a parameter value to the display unit 150. Display 'input display window'. At this time, the operator directly inputs the parameter value of the communication line to be measured, for example, capacitance per unit length (S726).

Since the capacitance per unit length, which is a parameter directly input by the operator, is shown in a cable specification provided by a cable manufacturer, the value is easily understood.

As described above, when the capacitance per unit length of the communication line of the measurement target is directly input, the controller 112 executes a program stored in the disconnection distance calculator 508, and the disconnection distance calculator 508 is an input parameter. The disconnection distance is calculated based on the capacitance value per unit length and the calculated line capacitance (S728).

Then, the calculated distance to the disconnection point is displayed through the display unit 140 (S730).

According to the configuration and process as described above, after measuring the line condition and disconnection / short circuit point distance, and performing the line repair based on this, the communication line test can be tested by immediately calling the subscriber using the terminal according to the present invention. It becomes possible.

In one embodiment of the present invention, the parameter directly input by the operator to measure the short circuit distance is a capacitance per unit length, and is configured to measure the short circuit distance based on this, but it is not limited thereto. It is also possible to configure the input and diameter directly as a parameter and to measure the short-circuit distance based on the input specific resistance and the diameter, in this case, of course, it belongs to the technical scope of the present invention.

The above embodiments of the present invention are merely one embodiment of the technical idea of the present invention, and of course, other modifications are possible within the technical idea of the present invention.

The communication line fault diagnosis terminal of the present invention having the configuration and operation process as described above, and the communication line fault diagnosis and distance measuring method using the same have the following effects.

First, it is possible to determine the disconnection / short-circuit status of the communication line and to accurately measure the distance to the disconnection point and the short-circuit point by a simple configuration based on the pre-entered communication line parameters and the measured line voltage. have.

Second, the phone circuit unit 160 has an effect of immediately knowing whether the line repair is completely performed by calling the subscriber or the exchange after the line check and repair.

Third, by displaying the previously memorized line parameters to the operator and selecting the displayed communication line, the disconnection distance or short circuit distance is automatically displayed so that the operator can easily and quickly inform the operator of the disconnection and short circuit distance. As a result, anyone can easily measure the disconnection and short-circuit distance.

Claims (9)

Line status check menu key is input and a predetermined parameter is input 'key input unit' 150 A 'line connection unit' 130 for selecting and connecting a corresponding line from a tip line, a ring line, and a ground line when a line state check menu key input from the key input unit 150 is input; A 'voltage measuring unit' 120 for applying a predetermined voltage to the line selected by the line connecting unit 130 and selectively connecting a plurality of resistors having different resistances to measure a line voltage; An 'A / D D / A converter' (Analog / Digital Digital / Analog Converter) 111 for converting an analog signal measured by the voltage measuring unit 120 into a digital signal or converting a digital signal into an analog signal; The line resistance is calculated based on the line voltage measured by the voltage measuring unit 120. When the calculated line resistance is smaller than the predetermined resistance, the short circuit distance is calculated. A 'program storage unit' 113 for storing a program for calculating a disconnection distance if the calculated capacitance is smaller than a predetermined value; A 'resistance database' 114 that stores a 'resistance per unit length' according to the type of communication line and stores a reference resistance as a reference for comparison with the calculated line resistance; A 'capacitance database' 115 which stores 'capacitance per unit length' according to the type of communication line and stores a reference capacitance as a reference for comparison with the calculated capacitance; A comparator 116 for comparing the calculated line resistance or capacitance with the reference resistance or reference capacitance; A timer 116 that counts time; A control unit 112 for executing a program stored in the program storage unit 113 to check the line state based on the input of the line state check menu key of the key input unit 150 and to control the overall configuration of the terminal; A display unit 140 displaying data and measured values under control of the controller 112; And, Communication line failure diagnosis terminal, characterized in that it comprises a power supply unit 182 for supplying power. The method of claim 1, wherein the voltage measuring unit 120, A power supply unit 202 for applying a predetermined voltage to the communication line connected by the line connection unit 130; A resistance unit 206 composed of a plurality of resistance elements each having a different resistance value; A resistance selection unit 204 for selectively connecting the power supply unit 202 to a predetermined resistance element in the resistance unit 206 by controlling the 'switching control signal' received from the control unit 112; And, And a line voltage output terminal (208) for outputting line voltages of communication lines connected by switching of the resistance selection unit (204). The method of claim 2, wherein the program storage unit 113, A line resistance calculator 502 for calculating a line resistance of the communication line based on the communication line voltage measured by the voltage measuring unit 120 and the applied voltage; Short circuit for calculating the distance to the short circuit point based on the line resistance calculated by the line resistance calculation unit 502 and the resistance per unit length input from the key input unit 150 or stored in the resistance database 114 A distance calculator 504; A capacitance calculator 506 for calculating a capacitance based on a discharge time of a voltage applied to a line under control of the controller 112; And, The distance to the disconnection point is calculated based on the capacitance calculated by the capacitance calculator 506 and the capacitance per unit length inputted from the key input unit 150 or stored in the capacitance database 114. Communication line failure diagnosis terminal, characterized in that consisting of the disconnection distance calculation unit (508). The method according to any one of claims 1 to 3, A ringer unit 132 for detecting and outputting a ring signal input from the exchange; Phone circuitry 160 for talking to subscribers or exchanges; And, Communication line failure diagnosis terminal, characterized in that further comprises a 'LAN interface unit 170 for data communication through the network. Inputting a line status check menu key; Connecting the corresponding communication line by controlling the line connection unit 130 by the controller 112 based on the line state check menu key; Measuring the line voltage of the communication line by applying a predetermined voltage to the voltage measuring unit 120 under the control of the control unit 112 when the corresponding communication line is connected; Calculating line resistance based on the measured voltage; Comparing the calculated line resistance with a preset reference resistance; If the line resistance measured by the comparison is smaller than the preset reference resistance, displaying “short circuit” on the display unit 140; Displaying the “line parameter” stored in the “resistance database” 114 on the display unit 140 after the “short circuit” display; Comparing and determining whether a parameter matching the displayed line parameter is input after displaying the line parameter; Calculating a short circuit distance by executing a program stored in the short circuit distance calculator 504 based on the resistance per unit length stored in response to the corresponding line parameter when a parameter matching the displayed line parameter is input. ; And, Communication line failure diagnosis and distance measuring method using a communication line failure diagnosis terminal, characterized in that comprising the step of displaying the calculated short circuit distance on the display unit (140). The method according to claim 5, After displaying the 'line parameter' on the display unit 140, if a line parameter different from the displayed line parameter is input, the program stored in the short circuit distance calculating unit 504 based on the resistance per unit length, which is the input 'line parameter'. Calculating a distance to the short-circuit point by executing; And, Communication line fault diagnosis and distance measuring method using a communication line failure diagnosis terminal, characterized in that further comprising the step of displaying the calculated distance to the short-circuit point through the display unit 140. The method according to claim 6, When the calculated line resistance and the predetermined reference resistance are larger than the predetermined reference resistance by comparison, the power supply of the predetermined voltage applied to the communication line by the voltage measuring unit 120 is applied to the 'power supply of the controller 112. Discharging the charges charged in the communication line by blocking resistance by an application blocking control signal and simultaneously connecting a resistance to the communication line; Counting a discharge time by driving a timer 117 at the same time as the discharge; Calculating the capacitance of the communication line based on the discharge time and the resistance counted by the timer; Comparing the calculated capacitance with a predetermined capacitance; And, In the case where the capacitance calculated by the comparison is smaller than the predetermined capacitance, the display unit 140 displays " disruption ", and if the capacitance calculated by the comparison is not smaller than the preset capacitance, the display unit 140 displays " normal " Communication line failure diagnosis and distance measuring method using a communication line failure diagnosis terminal, characterized in that the configuration further comprises. The method according to claim 7, Displaying the "line parameter" stored in the "capacitance database" 115 on the display unit 140 after displaying the "disconnected line"; Comparing and determining whether a parameter matching the displayed line parameter is input after displaying the line parameter; When a parameter coinciding with the line parameter displayed by the comparison determination is input, the disconnection distance is calculated by executing the program stored in the disconnection distance calculation unit 504 based on the capacitance per unit length stored in correspondence to the corresponding line parameter. step; Communication line fault diagnosis and distance measuring method using a communication line fault diagnosis terminal, characterized in that the step further comprising the step of displaying the calculated short circuit distance on the display unit (140). The method according to claim 8, After displaying the 'line parameter' on the display unit 140, if a line parameter different from the displayed line parameter is input, the single line distance calculation unit 508 is stored on the basis of the capacitance per unit length that is the input 'line parameter'. Executing a program to calculate a distance to a disconnection point; And, Communication line fault diagnosis and distance measuring method using a communication line fault diagnosis terminal, characterized in that further comprising the step of displaying the calculated distance to the disconnection point through the display unit.

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