KR100277476B1 - Trunk Line Board Self Diagnosis Apparatus and Method of Private Exchange - Google Patents

Abstract

By analyzing the information detected during the initial installation of the CO line board in the slot of the private exchange system or during operation of the CO line board, it is possible to self-diagnose the abnormality of the CO line board and the position of the device executing the abnormal function so as to output the diagnosis result. In the case where the completed CO line board is mounted in the slot, switching means for switching the tip end and the ring end connected to the national exchange side to form a closed loop to test the inter-device communication path system in the CO line board, and the formation of a closed loop. A terminal resistor for impedance matching the test tone circulated in time, a current detecting means for detecting the DC current applied to the tip end and the ring end, and a circulating test tone current, and a signal applied in two lines from the current detecting means to four lines Circuit conversion means for converting a four-line signal to a two-line to be sent to a local exchange. Codec converts 4 lines of digital PCM data into analog signals for converting and applying analog signals converted to 4 lines into digital PCM signals, and transmitted / received when a call is formed between a local exchange and an extension terminal. Buffer means for regulating the flow of signals so that data does not collide; loop forming means for enabling a control signal applied during the test of the extension line system to form the extension line system in a predetermined state loop; When entering the mode includes a control means for controlling the overall operation for the execution of the diagnostic operation.

Description

Trunk Line Board Self Diagnosis Apparatus and Method of Private Exchange

The present invention relates to a private exchange system, and more particularly, the position of a device that performs abnormality and abnormal function of a trunk line board by analyzing information detected during the initial installation of the trunk line board or the operation of the trunk line board. The self-diagnostic apparatus relates to a trunk line board self-diagnosis apparatus of a private exchange which enables a self-diagnosis to be output.

In the conventional private exchange system, as can be seen in the accompanying FIG. 1, the trunk line trunk board 2a is connected to the station subscriber board 1a in the local exchange 1, and the station subscriber board 2c is connected to a plurality of stations. The line test board 2d is connected to the station subscriber board 2c which connects the terminal 3, and which connects the said station terminal 3 to.

As described above, the line test board 2d connected to the station subscriber board 2c checks whether there is an abnormality in the call port between the station terminal 3 and the private switchboard 2, which is a control signal for checking the call path. Of the station subscriber board 2c to which the line test board 2d and the station terminal 3 are connected by applying an extension to the station subscriber board 2c and driving an offline test relay provided in the station subscriber board 2c. After connecting the line, only the abnormality of the call path from the extension subscriber board 2c to the extension terminal 3 was checked.

Therefore, the line test board provided in the conventional private exchange can only diagnose the state of the call port of the station terminal and the station subscriber board, and it is installed as a separate board in the private exchange. There is a problem in that limited slots cannot be used efficiently when the additional board is installed for expansion, and there is a problem in that an internal device of a trunk line board is not broken or whether a device is not mounted and a call system test cannot be executed in the board.

In addition, there is a problem that can not diagnose the abnormality in the call with the CO line because the CO board is not equipped with a diagnostic board.

The present invention has been made in view of the above-described general problems, and an object thereof is to actively execute a call system test of a trunk line board connected to an extension subscriber board of a national exchange so as to diagnose abnormalities, and configure a trunk line board. It provides reliability in mass production by detecting the failure of each device and whether it is not mounted and outputting diagnostic data. Also, it is convenient for maintenance by diagnosing CO and internal subscriber boards at set intervals after the installation of the private exchange system. It is intended to provide reliability.

1 is a schematic connection diagram for diagnosing an extension subscriber board in a conventional private exchange,

2 is a block diagram illustrating a trunk line board self-diagnosis apparatus of a private exchange according to the present invention.

<Explanation of symbols for the main parts of the drawings>

11 relay 12 holding circuit part

13: transformer 14: codec

15 buffer 16 tone detection circuit

17 loop forming circuit 18 processor

19: bus memory

The present invention for achieving the object as described above, in the trunk line board of the private exchange system, when the completed trunk line board is mounted in the slot is connected to the national exchange side to test the inter-element currency path system in the trunk line board Switching means for switching the tip and ring ends to form a closed loop;

A terminating resistor for impedance matching the test tones circulated upon formation of the closed loop by the switching means;

Current detecting means for detecting a DC current applied to the tip and ring ends and a cyclic test tone current;

A line converting means for converting a signal applied to the two lines from the current detecting means into four lines and converting a signal of the four lines to be sent to the local exchange side into two lines;

A codec for converting the analog signal applied by being converted into the four lines into a digital PCM signal and converting four lines of digital PCM data into an analog signal for transmission to a local exchange side;

Buffer means for regulating the flow of signals so that data transmitted and received are not collided when a call is established between the local exchange and an extension terminal;

Tone detection means for detecting various tone signals applied from the subscriber line of the local exchange through the tip and ring ends;

Loop forming means which is enabled by a control signal applied during the test of the extension line system and forms the extension line system in a loop of a predetermined state;

A program algorithm for self-diagnosis within the trunk line board is set, the control means for controlling the overall operation for executing the diagnostic operation when entering the self-diagnosis mode;

Bus memory means for executing data communication between the control means and the system main control means via a local bus and a system bus.

According to the present invention having the above technical configuration, the tip and ring ends are switched to end resistors by using switching means to form a loop consisting of a codec → a circuit conversion means → a current detection means → a termination resistance → a current detection means → a circuit conversion means → a codec. Then, the test tone is circulated, and the abnormality of the current converting means and the circuit converting means is diagnosed by detecting the test tone circulating in the loop, and the internal communication path is made through the loop forming means according to the enable signal from the control means. The system is formed in a loop, and the test tone is circulated to diagnose abnormalities of the buffer means and the communication line highway from the level of the test tone detected by circulating through the call system loop.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As can be seen in Figure 2, the trunk line board self-diagnostic apparatus of the private exchange according to the present invention is a termination resistor (R10), relay 11, holding circuit unit 12, transformer 13, A / D conversion A unit 14, a buffer 15, a tone detection circuitry 16, a loop circuitry 17, a processor 18 and a bus memory 19, the relay 11 is connected to the station subscriber line of the local exchange. In order to test the transformer 13 or the test by the exchange between the local exchange and the private exchange, the tip end and the ring end contact are transferred to the termination resistor (R10).

The terminating resistor R10 impedance-matches the circulated signal when the tip terminal and the ring terminal connected to the internal subscriber line of the local exchange are switched to the terminating resistor R10 through the switching of the relay 11 to form a closed loop.

The holding circuit unit 12 transfers the DC current applied from the trunk line to the tip and ring ends and the current detected from the termination resistor R10 to each load side connected to the subsequent end.

The transformer 13 converts the signal of the analog state applied through the holding circuit unit 12 from two lines to four lines.

The codec 14 converts analog signals applied from the tip and ring ends into digital PCM data signals, and converts the digital PCM data for transmission to the tip and ring ends into analog signals and outputs the analog signals.

The codec 14 includes a tone generating means for generating a test tone and a comparison means for comparing the level of the test tone detected by circulating the loop formed for the test with the level of the test tone circulated through the loop.

The buffer 15 adjusts the flow of the signal so that the signal applied from the codec 14 and the signal for transmitting from the station do not collide with each other.

The tone detection circuit unit 16 detects various tone signals applied from the subscriber line of the local exchange through the tip end and the ring end.

The loop circuit unit 17 forms a loop for the test proceeding according to a control signal applied from the processor 18 during the call path test with the CO line or the call path test between the extension lines and the call path test of the board itself.

The processor 18 sets a program algorithm for self-diagnosis within the board, and controls the overall operation of executing the diagnostic operation when entering the self-diagnosis mode.

The bus memory 19 is connected to the processor 18 via a local bus and to the main control means of the system via the system bus to exchange information between the processor 18 and the main control means of the system.

In the case where the present invention having the technical configuration as described above is mounted in the slot of the private exchange, a typical operation for forming and maintaining a communication path between the local exchange and the extension terminal is as follows.

The holding circuit section 12, in which the DC current applied to the tip end and the ring end connected to the extension subscriber line of the local exchange is detected by the holding circuit section 12 in a state where a call path connection request or a call path is formed from the national exchange, is detected DC. Current is applied to the transformer 13 side.

The transformer 13 converts the analog signal applied to the two wires of the tip and the ring into four wires, and then applies the signal to the codec 14 so that the codec 14 converts the applied analog signal into digital PCM data. It applies to the buffer 15 side.

At this time, the buffer 15 adjusts the synchronization of signals so that signals transmitted and received from the station do not collide with each other so as to transmit a signal from the trunk line to the station, and then transmits the signal to the station through the transmitting PCM highway.

In addition, since the digital PCM transmission data applied from the extension terminal through the receiving PCM highway is applied to the codec 14 after synchronization of transmission is adjusted by the buffer 15, the codec 14 is applied for transmission. The digital PCM data is converted into an analog signal and then applied to the transformer 13 side.

The transformer 13 converts the applied 4-wire analog transmission signal into 2 wires and then transmits them to the local exchange through the tip and ring ends.

At this time, the processor 18 transmits and receives the information of the operation state in which the transmission and reception proceeds and the control signal information of the main control means of the system through the bus memory 19.

As described above, the self-diagnosis operation in the trunk line trunk board or the extension subscriber board of the private exchange that maintains the stable communication path between the local exchange and the extension terminal is as follows.

When the board having the above technical configuration is mounted in any slot of the private exchange and the processor 18 is operated for the first time, information about this is transmitted to the main control means of the system via the local bus to form a private exchange. In this case, initialization is executed according to the mounting of the board.

When the initialization of the local board is completed as described above, the relay 11 is switched according to the algorithm set in the processor 18 to switch the tip and ring ends to the termination resistor R10 to disconnect the tip and ring ends from the trunk line, R10) forms a trunk line board as a closed loop.

As described above, when the trunk line board is formed as a closed loop through the termination resistor R10 by the switching operation of the relay 11, the tone generating means provided in the codec 14 generates a predetermined test tone to generate a transformer 13 → holding circuit section 12 → terminating resistor R10 → holding circuit section 12 → looping transformer 13 to detect circulating tone level, and then holding by comparing the circulating tone level with the level of the transmitted test tone It is determined whether the path between the circuit unit 12 and the transformer 13 is normal.

When the level attenuation of the test tone circulated through the loop is remarkably generated or not detected, it is determined that the level attenuation occurs in the holding circuit unit 12 or the transformer 13 is disconnected. give.

In addition, the processor 18 applies a loop enable signal to the first buffer 17a of the loop circuit unit 17 to form the transmit highway (Tx highway) and the receive highway (Rx highway), which are digital extension lines, as closed loops. do.

As described above, when the digital extension line system is formed as a closed loop due to the enable of the first buffer 17a in the loop circuit unit 17, the tone generating means in the codec 14 generates a predetermined test tone and then uses the loopback function. When the test tone is transmitted, the transmitted test tone is looped through the buffer 15 → the transmit highway (Tx highway) → the first buffer 17a → the receive highway (Rx highway) → the buffer 15, and then the codec 14 ) Is received.

In this case, when the signal circulating the loop is not detected, the codec 14 determines that there is an error in the buffer 15 or the transmit / receive highway and outputs a result thereof.

When it is determined that there is an error in the buffer 15 or the transmit / receive highway as described above, the processor 18 requests tone transmission to the main control means of the system through the local bus, the bus memory 19 and the system bus, and at the same time, the loop circuit part. The loop enable signal is applied to the second buffer 17b of (17) to form a closed loop of the trunk line internal communication line system and the system interior.

Thereafter, the main control means of the system detects and analyzes the test tone circulated by looping the reception highway (Rx highway) → second buffer 17b → transmission highway (Tx highway) of the trunk line extension line. .

If it is determined that there is no abnormality in the level of the test tone detected by the main control means of the system, it is determined that there is an abnormality in the buffer 15 and outputs the result thereof.

In addition, when the test for the out line is to be carried out, through the switching of the relay 11, the tip end and the ring end are formed as the connection with the trunk line in the connection with the termination resistor R10 side, and then dial tone received from the local exchange. Is detected through the tone detection circuit unit 16.

At this time, if the dial tone received from the local exchange is normally detected by the tone detecting circuit unit 16, there is no abnormality in the path from the tip end and the ring end to the local exchange, and if the dial tone is not detected, the local exchange from the tip end and the ring end. It is determined that there is an error in the line up to or that the line is not connected, and the result is output.

Therefore, the operator can determine the abnormality of the CO line board itself and the position of the device in which the abnormality occurs based on the output test result, and can diagnose the abnormality of the CO line and the extension line.

In the above description, the process executed in the trunk line board itself has been described. However, the above-described test can be executed through an external key input after connecting a serial interface to the outside, and the test result can be displayed on a monitor.

As described above, the present invention can actively execute the test of the call of the trunk line board in the trunk line board of the private switchboard, and check the path of each element in the trunk line board to detect the position of the device in which the abnormality occurs. It can be tested automatically at the time of mass production, thus providing the reliability of the product.

In addition, with a trunk line board mounted in a private exchange, a periodic series of tests provide stability and reliability for maintenance by conducting tests and self-diagnosis of the channel up to the local exchange and the digital extension line system.

Claims (6)

In a trunk line board of a private exchange system, when the manufactured trunk line board is mounted in a slot, a switching to form a closed loop by switching tip and ring ends connected to the main exchange side in order to test the inter-device communication path system in the trunk line board. Means; A terminating resistor for impedance matching the test tones circulated upon formation of the closed loop by the switching means; Current detecting means for detecting a DC current applied to the tip and ring ends and a cyclic test tone current; A line converting means for converting a signal applied to the two lines from the current detecting means into four lines and converting a signal of the four lines to be sent to the local exchange side into two lines; A codec for converting the analog signal applied by being converted into the four lines into a digital PCM signal and converting four lines of digital PCM data into an analog signal for transmission to a local exchange side; Buffer means for regulating the flow of signals so that data transmitted and received are not collided when a call is established between the local exchange and an extension terminal; Tone detection means for detecting various tone signals applied from the subscriber line of the local exchange through the tip and ring ends; Loop forming means which is enabled by a control signal applied during the test of the extension line system and forms the extension line system in a loop of a predetermined state; A program algorithm for self-diagnosis within the trunk line board is set, the control means for controlling the overall operation for executing the diagnostic operation when entering the self-diagnosis mode; And a bus memory means for performing data communication between the control means and the system main control means via a local bus and a system bus. 2. The apparatus of claim 1, wherein the codec comprises: tone generating means for generating a predetermined test tone when a loop for a device-to-device call path test is formed; And comparing means for detecting the level of the test tone detected through the loop formed by comparing the test tone sent for the monetary system test to determine whether there is an abnormality in each element forming the corresponding loop. CO line board self-diagnosis device of private exchange. 2. The trunk line board self-diagnosis apparatus of a private exchanger according to claim 1, wherein the terminal resistor is connected to both ends of the tip end and the ring end when the tip end and the ring end are switched by the switching means. 2. The apparatus of claim 1, wherein the loop forming means comprises: a first buffer configured to form a loop from a transmission highway of an extension line system to a reception highway according to an enable control signal; And a second buffer configured to form a loop from the reception highway to the transmission highway according to the enable control signal. In the trunk line board of the private exchange system, switching ends are used to switch the tip and ring ends to form a loop consisting of codec → circuit conversion means → current detection means → termination resistance → current detection means → circuit conversion means → codec. Then circulating the test tone; Diagnosing an abnormality of the current converting means and the circuit converting means by detecting a test tone circulating in the loop; Circulating a test tone after looping the extension path system through a loop forming means according to the enable signal from the control means; And diagnosing abnormality of the buffer means and the communication line highway from the level of the test tone detected by circulating through the communication line loop. 6. The method of claim 5, wherein if the test tone circulated in a state where the loop of the extension line is formed as a transmission highway → a loop forming means → a reception highway is detected in the above process, the loop of the extension path system receives a loop of the extension path system. Forming the transmission means and transmitting a test tone from the system control means; The method may further include determining that the test tone detected by the system control means is abnormal in the buffer means, and determining that the test tone is abnormal in the extension line system highway when the test tone is detected abnormally. Self-diagnosis method of trunk line board of exchange system.