KR20040067076A - Apparatus and method for error search by ipc diagostic in system comprised of many boards - Google Patents

Abstract

PURPOSE: An apparatus and a method for diagnosing an error according to IPC(Inter-Process Communication) diagnosis in a system having a plurality of boards are provided to search a board with an error by a diagnosis command between boards by using an IPC diagnosis of an operator. CONSTITUTION: An operator(300) commands an operator terminal(302) to perform diagnosis between boards(320). The operator terminal(302). The operator terminal(302) determines parameters for performing inter-board diagnosis(322). The operator terminal(302) commands a main board(304) to perform inter-board diagnosis(324). The main board(304) performs inter-board diagnosis with a diagnosis board 4(310)(326). The main board(304) determines whether there is an error between the main board(304) itself and the diagnosis board 4(310)(328). Inter-board diagnosis is performed between the main board(304) and a diagnosis board 3(308)(330). The main board(304) analyzes results of the diagnosis between the main board(304) itself and the diagnosis board 3(308)(332). The main board(304) performs diagnosis between the main board(304) itself and a diagnosis board 1(306)(334), and analyzes the diagnosis results(336). The main board(304) transmits the diagnosis results to the operator terminal(302)(338) and the operator terminal(302) transmits the diagnosis results to the operator(300).

Description

An apparatus and method for diagnosing errors by diagnosing interprocess communication in a system composed of multiple boards {APPARATUS AND METHOD FOR ERROR SEARCH BY IPC DIAGOSTIC IN SYSTEM COMPRISED OF MANY BOARDS}

The present invention relates to a diagnostic apparatus and method for a plurality of boards, and more particularly, to an apparatus and method for diagnosing an error between boards.

The mobile communication system is composed of a plurality of Radio Network Controllers (RNCs) and a plurality of base stations (Node-Bs) in charge of wireless communication with mobile terminals. In addition, several systems including a core network (CN) exist in an upper layer of the plurality of radio network controllers and the plurality of base stations.

And there is an operator terminal in charge of operating and maintaining the system of the plurality of wireless network controllers, a plurality of base stations, a core network and the like. The operator terminal commands the operation and maintenance for each system. Each system, which has been instructed by the operator terminal about the operation and maintenance of the system, has a volume of call, distribution of call volume, call quality, call capacity calculation data, failure characteristics, etc. through a LAN such as Ethernet. Statistical data is measured and output periodically or at the request of the system operator. This allows the operator of the system to collect and analyze the statistical data for direct and indirect use in the operation and maintenance of the entire mobile communication system. The statistical data includes traffic statistics, handover statistics, channel element statistics, vocode statistics, alarm statistics, trunk line link statistics between base station transmission systems, statistics on radio channel quality, statistics on processes, statistics on failures, and alarms. Statistics, base station transmission system performance statistics, paging statistics, base station transmission system location registration statistics, daily statistics, monthly statistics.

1 is a diagram showing a structure of a specific system composed of a plurality of boards. Hereinafter, a structure of a specific system composed of a plurality of boards will be described in detail with reference to FIG. 1. The specific system is not only a mobile communication system but also a system composed of boards having a hierarchical structure.

1 is composed of an operator terminal 100, a main board 102, and a plurality of diagnostic boards 104 to 110. The main board 102 and the plurality of diagnostic boards 104 to 110 are configured in a hierarchical structure. That is, the plurality of diagnostic boards 104 to 110 are constituted by diagnostic boards 1 104 and 4 (110). In addition, the diagnostic boards 2 106 to 4 110 comprise a plurality of diagnostic boards for one upper diagnostic board. Hereinafter, a process in which board-to-board diagnosis is performed by an operator's command in a system configured in a hierarchical structure will be described with reference to FIG. 2.

2 is a diagram illustrating a process in which board-to-board diagnostics are performed by an operator-to-board diagnostic command in a specific system including a plurality of general diagnostic boards. It is apparent that the specific system corresponds to not only the specific system of the mobile communication system but also a system in which a plurality of boards form a hierarchical structure. For convenience of explanation, the following describes a core network in which a plurality of boards of a mobile communication system form a hierarchical structure. The core network is composed of a plurality of boards (5 stage boards). When the boards of the fifth step are found from the upper level, the main processing unit (hereinafter referred to as MPU) board, switch board, H multiplex (MUX) board, P multiplex (MUX) board, and PSTN board have. The MPU is a board that performs board-to-board diagnostics for a specific board according to the board-to-board diagnostic command notified from an operator terminal, and the remaining boards except for the MPU are boards for which board-to-board diagnostics are performed by the MPU.

As shown in FIG. 2, the core network is composed of five boards. That is, it consists of a main board and four diagnostic boards. The main board is an MPU, and the four diagnostic boards are the switch board, the H multiplex (MUX) board, the P multiplex (MUX) board, and the PSTN board.

In operation 210 of the board diagnosis, the operator 200 instructs the operator terminal 202 to diagnose whether there is an error for a board to which board-to-board diagnosis is desired. In FIG. 2, the operator 200 is limited to a case in which the operator 200 commands a diagnosis of an error between the main board 204 and the diagnostic board 4 208. In general, by diagnosing an error between a top board and a bottom board, an error between the boards is diagnosed. In this case, the operator 200 may specify and command parameters for diagnosing an error. In addition, if the operator transmits a diagnosis command, the diagnosis may be performed using the diagnosis parameters stored in the operator terminal 202 or the main board 204 without designating additional diagnosis parameters of the operator.

In operation 212 of the board diagnosis, the operator terminal 202 reads out and sets parameters to perform diagnosis from a storage device included in the operator terminal 202 according to the board-to-board error diagnosis command received in operation 210. do. Obviously, the parameters can be made by a command by the operator 200 as described above.

In step 214 of the board diagnosis, the operator terminal 202 transmits the board diagnosis parameters and the board section to be diagnosed in step 212 to the main board 204.

In operation 216 of the board diagnosis, the main board 204 performs board diagnosis between diagnosis boards commanded by the operator 200. The board diagnosis is generally performed using inter process communication (hereinafter referred to as IPC). That is, when data is transmitted from the main board to the diagnostic board to perform the diagnosis, the diagnostic board transmits whether or not the data transmitted from the main board is received. In addition, such a process is performed a plurality of times without performing a single communication to reduce the error. 2 illustrates a process in which the main board 204 performs board-to-board diagnosis with the diagnostic board 4 208. That is, the main board 204 performs board-to-board diagnosis with the diagnostic board 4 208 via the diagnostic board 1 206 and the like.

In step 218 of the board diagnosis, the main board 204 analyzes the result of board diagnosis according to the IPC communication with the diagnosis board 4 (208). The result of the board diagnosis is whether or not the diagnostic board 4 208 transmits a response message to the motherboard 204 when the main board 204 performs IPC communication with the diagnostic board 4 208. It is judged accordingly. That is, when the main board 204 receives a response message from the diagnostic board 4 208, the main board 204 determines that there is no error in the diagnostic path with the diagnostic board 4 208. However, when the main board 204 does not receive a response message from the diagnostic board 4 208, the main board 204 determines that there is an error in the diagnostic path with the diagnostic board 4 208.

If the main board 204 transmits a board diagnosis result to the operator terminal 202 according to the IPC in step 220 of board diagnosis, the operator terminal 202 receives the received inter-board diagnosis in step 222 of the board diagnosis. Send the result to the operator.

In operation 224 of the board diagnosis, the operator 200 diagnoses other than the main board 204 and the diagnosis board 4 208 according to the inter-board diagnosis result transmitted from the operator terminal 202 in operation 222. It is determined whether the board-to-board diagnosis is performed between boards. That is, if it is determined that there is no abnormality as a result of the received board-to-board diagnosis, the operator 200 ends the board-to-board diagnosis. However, if it is determined that there is an abnormality in the received inter-board diagnosis result, it should be determined which of the four diagnostic boards including the main board 204 has an error. Therefore, the operator 200 returns to step 210 again to instruct an on-board diagnosis command between the main board 204 and the diagnostic board 3. By the board-to-board diagnostic command of the operator 200, the core network newly performs steps 212 to 222. Of course, in this case, it is obvious that the board-to-board diagnosis between the main board 204 and the diagnostic board 3 is performed.

If an on-board diagnosis between the main board 204 and the diagnosis board 3 is performed and step 222 of the board diagnosis is performed, the operator 200 performs step 224. In operation 224 of the board diagnosis, the operator 200 determines the main board except for the diagnosis board 3 and the diagnosis board 4 208 according to the inter-board diagnosis result transmitted from the operator terminal 202 in operation 222. It is determined whether the board-to-board diagnosis is performed between other diagnostic boards including 204. That is, if it is determined that there is no abnormality as a result of the received board-to-board diagnosis, the operator 200 ends the board-to-board diagnosis. However, if it is determined that there is an abnormality between the received inter-board diagnosis results, it is necessary to determine which of the three diagnostic boards except the diagnosis board 4 208 including the main board 204 has occurred in the board.

As described above, the main board transmits only the presence or absence of an error between the main board and the diagnostic board by the board-to-board diagnostic command using the board-to-board IPC, and thus does not transmit information on which board an error has occurred. The controller should determine whether to perform a new board-to-board diagnosis according to the board-to-board diagnosis result, and instruct the board-to-board diagnosis command again when the board-to-board diagnosis is newly performed. That is, by performing such a complicated process, the operator can analyze the board in which the error occurs. Therefore, there is a demand for a solution to alleviate this inconvenience.

Accordingly, an object of the present invention for solving the above-mentioned problems of the prior art is to propose an apparatus and method for searching for a board in which an error occurs by an on-board diagnosis command using an IPC diagnosis of an operator.

Another object of the present invention is to propose an apparatus and method for reducing the time spent searching for a faulty board by searching for a faulty board without an additional board-to-board diagnostic command.

Another object of the present invention is to propose an apparatus and method for correcting an error from an upper board when an error occurs in a plurality of boards.

In order to achieve the above object of the present invention, a main board of a system composed of a plurality of boards performs an IPC diagnosis on a lowermost board by an inter-board diagnostic command notified by an operator to determine whether there is an error. If it is determined that an error has occurred as a result of the determination, the board in which the error occurs is searched by sequentially performing IPC diagnosis on the upper boards of the lowest board even if another command of the operator is not transmitted. In addition, when an error occurs in a plurality of boards, the error is corrected sequentially from the upper board.

1 is a diagram showing the structure of a general system composed of a plurality of boards.

2 is a diagram illustrating a process of diagnosing an error of a specific board among a plurality of boards using IPC.

3 is a diagram illustrating a process of diagnosing an error of a specific board among a plurality of boards using the IPC according to the present invention.

4 is a diagram illustrating a process of diagnosing an error in two or more boards among a plurality of boards using the IPC according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

3 is a diagram illustrating a process in which board-to-board diagnostics are performed by a board-to-board diagnostic command of a specific system including a plurality of diagnostic boards according to the present invention. It is apparent that the specific system corresponds to not only the specific system of the mobile communication system but also a system in which a plurality of boards form a hierarchical structure. For convenience of explanation, the following describes a core network in which a plurality of boards of a mobile communication system form a hierarchical structure. The core network is composed of a plurality of boards (5 stage boards). When the boards of the five stages are found from the upper stage, the main processing unit (hereinafter referred to as MPU) board, switch board, H multiplex (MUX) board, P multiplex (MUX) board, and PSTN board are configured. have.

As shown in FIG. 3, the core network is composed of five boards. That is, it consists of a main board and four diagnostic boards. The main board is an MPU, and the four diagnostic boards are the switch board, the H multiplex (MUX) board, the P multiplex (MUX) board, and the PSTN board. As described above, the mobile communication system is composed of a plurality of systems. Hereinafter, a process of performing an error diagnosis between boards to which the present invention is applied will be described in detail with reference to FIG. 3. 3 is composed of an operator, an operator terminal, a main board, and diagnostic boards 1 to 4. 3, the diagnostic board 2 is omitted. Although the main board is composed of five boards, the present invention is not limited to five boards. The main board is a board that performs and manages diagnostic boards and board-to-board diagnosis according to a command transmitted from the operator terminal, and the diagnostic boards are boards on which the diagnosis is performed by the main board.

In step 320 of the board-to-board diagnosis, the operator 300 commands the board-to-board diagnosis to the operator terminal 302. The board-to-board diagnosis may be indicated by a diagnosis command by the operator 300, but the operator 300 Obviously, the diagnostic command may be periodically indicated at a predetermined time without the diagnostic command. The board-to-board diagnostic command by the operator 300 may be indicated by a diagnostic command between any one of the diagnostic boards of the main board 304 and the four diagnostic boards. However, in general, in order to quickly determine whether the board-to-board diagnosis has occurred, a board-to-board diagnosis command between the main board 304 and the diagnostic board 4 310, which is the lowest board, may be issued. In addition, in this invention, it describes only when the main board 304 and the said lowest board instruct | indicate a diagnostic command between boards.

In step 322 of the board-to-board diagnostic, the operator terminal 302 determines parameters to perform the board-to-board diagnostic. Parameters for performing the board-to-board diagnosis may be instructed by the operator 300 at the same time as the board-to-board diagnosis command by the operator 300. However, in the present invention, it may be performed by parameters stored in a storage unit included in the operator terminal 302. The parameters may include the number of diagnosis, the diagnosis period, and the like. The number of diagnosis is to reduce the rate of error by setting the number of times of diagnosis between the main board 304 and the specific diagnostic board when a plurality of diagnostics between the main board 304 and the specific diagnostic board is performed by a diagnostic command or a set diagnostic period by the operator (300). For sake.

In step 324 of the board-to-board diagnosis, the operator terminal 302 instructs the main board 304 to issue the board-to-board diagnosis command. The board-to-board diagnostic command specifies and instructs the number of times of diagnosis and a board on which the main board 304 and board-to-board diagnostics are to be performed. As described above, the diagnostic board for performing the diagnosis between the main board 304 and the board is a diagnostic board 4 310.

In step 326 of the board-to-board diagnosis, the main board 304 performs board-to-board diagnosis with the diagnostic board 4 310. The board diagnosis is generally performed using inter process communication (hereinafter referred to as IPC). That is, when data is transmitted from the main board 304 to the diagnostic board to perform the diagnosis, the diagnostic board transmits a response message for receiving the data transmitted from the main board 304. Of course, the IPC diagnosis is performed via the diagnostic board 1 306 to the diagnostic board 3 308 connected to the main board 304 and the diagnostic board 4 310. The main board 304 stores a result of performing board-to-board diagnosis with the diagnostic board. Table 1 shows an example of storing a result of performing the inter-board diagnosis stored in the main board 304.

Transfer counter Transmission time Receive Receiving time One 2002.12.01.000000 X 2 2002.12.01.000002 X 3 2002.12.01.000004 X 4 2002.12.01.000006 X

As shown in Table 1, the main board 304 records the time when the IPC was performed by the diagnostic board 4 310 and whether the received IPC was received to perform the board-to-board diagnosis. Also, if received, the reception time is stored. In addition, the board-to-board diagnosis is commanded a plurality of times to perform the board-to-board diagnosis a plurality of times. When performing the board-to-board diagnosis a plurality of times, give a command with a number. In addition, when the diagnostic IPC is transmitted with the number, whether the received IPC is received in the order of the transmitted number is also recorded. In Table 1, the number of transmissions is four times, and no response is received for all of the transmitted IPCs.

In step 328 of the inter-board diagnosis, the main board 304 determines whether there is an error between boards between the main board 304 and the diagnostic board 4 310 using Table 1. In general, it is recognized that the board-to-board error has occurred only when there is no response to all transmitted IPCs. The error means that an error has occurred at any one point or a plurality of points of the diagnosis board 1 306 to the diagnosis board 4 310. Therefore, if there is any response to the transmitted IPC, it is determined that it is operating normally. When an error occurs as a result of the diagnosis, the main board 304 may transmit whether the error occurs to the base station manager 302. It may also be transmitted at the request of the operator 300. When an error occurs between the boards, the main board 304 may perform another board diagnosis with another board except for the diagnosis board 4 310. Table 2 above describes a method of performing board-to-board diagnostics.

Diagnostic method First diagnostic board Second diagnostic board 3rd diagnostic board Fourth diagnostic board A Diagnostic Board 4 Diagnostic Board 3 Diagnostic Board 2 Diagnostic Board 1 B Diagnostic Board 4 Diagnostic Board 1 Diagnostic Board 2 Diagnostic Board 3

As shown in Table 2, a diagnosis method may include the diagnosis method A and the diagnosis method B in general. However, both the diagnostic methods perform the board-to-board diagnosis with the diagnostic board 4 310, which is the lowest diagnostic board. In addition, the diagnostic method A performs a board-to-board diagnosis between the main board 304 and the diagnostic board when the board-to-board error with the diagnostic board 4 310 occurs, and performs the next board-to-board diagnosis only when an error occurs. . However, the diagnosis method B performs the next board-to-board diagnosis only when an error does not occur by performing a board-to-board diagnosis between the main board 304 and the diagnosis board when an error between boards with the diagnosis board 4 310 occurs. do. That is, the diagnostic method A indicates that an error has occurred in the upper diagnostic board when an error between boards has occurred, and the diagnostic method B indicates that an error has occurred in the lower diagnostic board when no error between boards has occurred. In the present invention, diagnostic method A will be described. However, diagnostic method B may also perform board-to-board diagnostics.

In step 330, the board-to-board diagnosis between the main board 304 and the diagnostic board 3 308 is performed. The processes performed in step 330 are the same as the processes performed in step 326. In step 332 of the board-to-board diagnosis, the main board 304 analyzes the result of the board-to-board diagnosis with the diagnostic board 3 (308). That is, the main board 304 determines the presence or absence of an error using the same information as in Table 1 above. In FIG. 3, there is no response to the IPC transmitted from the main board 304, that is, a case in which an error between boards between the main board 304 and the diagnostic board 3 308 occurs. Thus, the main board 304 performs board-to-board diagnostics with the diagnostic board 2. In FIG. 3, a process for this is omitted, but is the same as the process performed in the diagnostic board 4 to the diagnostic board 3 (308). In addition, the case where an error occurs in the diagnosis between the main board 304 and the diagnostic board 2 is shown.

In step 334 of the board-to-board diagnosis, the main board 304 performs board-to-board diagnosis with the diagnostic board 1 306. The process performed in step 334 is the same as the process performed in step 326. After the board-to-board diagnosis in step 334 is performed, the main board 304 analyzes the board-to-board diagnosis result in step 336 of the board-to-board diagnosis. As a result of the analysis, the board-to-board error between the main board 304 and the diagnostic board 1 306 did not occur. That is, it indicates that at least one response has occurred with respect to the IPC transmitted from the motherboard 304. This indicates that the board-to-board error has occurred by the diagnostic board 2.

In step 338 of the board-to-board transmission, the main board 304 transmits the diagnosis result to the operator terminal 302, and the operator terminal 302 transmits the board-to-board diagnosis result to the operator 300 in step 340. do. That is, the diagnostic board 2 transmits that an error has occurred, whereby the operator 300 corrects the error.

FIG. 4 illustrates a process of determining whether an error has occurred in a lower diagnostic board when correcting an error between boards generated in the diagnostic board 2 according to FIG. 3. That is, since an error between boards may occur at the same time in the diagnostic board 2 and the diagnostic board 3, a diagnosis is required.

In step 410 of the board-to-board diagnosis, the main board 400 corrects an error in the diagnosis board 2 404 according to an operator's instruction, and performs a new board-to-board diagnosis in step 412 of the board-to-board diagnosis. The board-to-board diagnosis in step 412 is the same as the board-to-board diagnosis process of FIG. 3. In step 414 of the board-to-board diagnosis, the main board 400 analyzes the results of the board-to-board diagnosis. If no error occurs, the main board 400 moves to step 416. However, if an error occurs, go to step 410 to newly correct the error of the diagnostic board 2 (404).

In step 416 of the board-to-board diagnosis, the main board 400 performs board-to-board diagnosis with the diagnosis board 3 (406), and analyzes the diagnosis result in step 418 of the board-to-board diagnosis. If an error occurs as a result of the diagnosis, the main board 400 notifies the base station manager that an error has occurred in the diagnosis board 3 (406). The operator, upon receiving the notification, instructs to correct the board-to-board error that occurred in the diagnostic board 3 (406). If no error is detected as a result of the diagnosis, the controller proceeds to step 420 to perform board-to-board diagnosis between the main board 400 and the diagnostic board 4 408, and analyzes the diagnosis result in step 422. By performing the process of FIGS. 3 to 4, the main board 400 and the diagnostic boards may correct errors. In addition, in the case of the diagnosis method B, if an error occurs in the upper board, the operator is notified, and the next board is diagnosed after correcting the board in which the error has occurred.

As described above, in the present invention, when there is a specific system composed of a plurality of boards, in performing board-to-board diagnosis by a diagnostic command of an operator or by a set time, an error occurs even if there is no separate instruction from an operator. Navigate the board. In addition, the operator can search for a board that has failed with a single diagnostic command, eliminating unnecessary action.

Claims (20)

At least one or more diagnostic boards and a main board managing the at least one or more diagnostic boards, wherein the main board and the at least one or more diagnostic boards are connected by a link. In the diagnostic boards or a method for determining the occurrence of an error in the link section to which the diagnostic boards are connected, Among the at least one diagnostic board, at least one of the diagnostic boards or the link board to which the diagnostic boards are connected is determined to be an error by the inter-process communication of the main board that has been informed of a board-to-board diagnostic command with a specific diagnostic board. Sequentially performing inter-process communication for each of the one or more diagnostic boards connected starting from the diagnostic board notified of the diagnostic command; When the main board determines that the link status is an error by the inter-process communication performed by any one of the at least one diagnostic boards among the at least one diagnostic boards, the diagnostic board or the link section determined as the error. And generating a fault by performing a diagnostic command by the processor communication on a diagnostic board or a link section connected to the diagnostic board. The method of claim 1, wherein the diagnostic board issues a diagnostic command by the processor communication to a diagnostic board or a link section connected before the diagnostic board or a link section determined as the error. 3. The method of claim 2, wherein if the communication between the previously connected diagnostic board and the process does not determine an error, the main board is determined to be the error or an error in the link section between the specific diagnostic board and the previously connected diagnostic board. The method for determining that has occurred. The method of claim 2, wherein the board notified of the board-to-board diagnostic command is a board connected last among the plurality of diagnostic boards. The method as claimed in claim 4, wherein the main board notifying the diagnosis board or the link section in which the error has occurred corrects an error in the diagnosis board or the link section determined as the error by an error correcting command. The diagnostic board of claim 5, wherein when the error of the diagnosis board or the link section determined as the error is corrected, the main board is connected to the diagnosis board connected to the link section where the error is corrected or the diagnosis board and the board where the error is corrected. The method characterized in that for performing. The diagnostic board of claim 1, wherein the main board transmits a diagnostic message having a unique index corresponding to the number of times of transmission to a diagnostic board to diagnose an error among the plurality of diagnostic boards by a predetermined period, and from the diagnostic board, a specific unique index. Or determining that an error occurred when a response message corresponding to all unique indices is not received. A plurality of diagnostic boards sequentially connected by a link and a main board managing the plurality of diagnostic boards, wherein the section connected by the link is a diagnosis in which an initial inter-board diagnostic command is instructed by the main board from a main board; A first diagnosis section connected to the board, the first diagnosis section being connected to the second diagnosis section from the main board to any diagnosis board of the first diagnosis section, and the first diagnosis section from any diagnosis board of the first diagnosis section. In a system divided into a third diagnostic section connected to a diagnostic board instructed by a diagnostic command, the main board determines whether a link section in which an error occurs among the links connecting the plurality of diagnostic boards using interprocessor communication (IPC). In the method, Performing communication between the main board, which has been informed of the board-to-board diagnostic command with a specific diagnostic board among the plurality of diagnostic boards, and the communication between the first board and the diagnostic board which is notified of the board-to-board diagnostic command; Performing communication between an arbitrary diagnostic board and a second process by the main board when the link state is determined to be an error as a result of performing the first interprocess communication; When the link state is determined to be an error as a result of performing the second interprocess communication, the main board performs communication between an arbitrary diagnostic board of the second diagnostic section and a third process, and the link state as a result of performing the second interprocess communication. Is determined to be normal, the main board comprises a process of performing communication between an arbitrary diagnostic board and a fourth process of the third diagnostic section. The method of claim 8, wherein the board notified of the board-to-board diagnostic command is a board that is connected last among the plurality of diagnostic boards. The diagnostic board of claim 7, wherein the main board transmits a diagnostic message having a unique index corresponding to the number of times of transmission to a diagnostic board to diagnose an error among the plurality of diagnostic boards by a predetermined period, and from the diagnostic board, a specific unique index. Or determining that an error occurred when a response message corresponding to all unique indices is not received. At least one or more diagnostic boards and a main board managing the at least one or more diagnostic boards, wherein the main board and the at least one or more diagnostic boards are connected by a link. In the diagnostic boards or apparatus for determining the occurrence of an error in the link section to which the diagnostic boards are connected, Among the at least one diagnostic board, the diagnostic command is notified to the board, and the diagnostic command is executed until the link state to which at least one or more diagnostic boards or the diagnostic boards are connected is determined to be an error by inter-process communication. Starting from the notification board that is notified and sequentially performing the inter-process communication for each of the at least one diagnostic board connected, When the link state is determined to be an error by the inter-process communication performed with any one of the at least one diagnostic board during the inter-process communication, the diagnostic board or link section determined as the error is connected. A main board for determining an error occurrence by performing a diagnostic command by the processor communication in a diagnostic board or a link section; And the diagnostic boards sequentially connected to the main board transmitting a response message by the inter-process communication of the main board. The method of claim 11, wherein the main board, And a diagnostic command by the processor communication to the diagnostic board or link section connected before the diagnostic board or link section determined as the error. The method of claim 12, wherein the main board, If the communication between the previously-connected diagnostic board and the process performed is not determined to determine that an error has occurred in the link section between the diagnostic board determined as the error or the specific diagnostic board and the previously connected diagnostic board. The device. The method of claim 13, wherein the main board, And performing communication between processes with a diagnostic board last connected to the first of the plurality of diagnostic boards by informing the board-to-board diagnostic command. The method of claim 14, wherein the main board, And reporting a diagnosis board or a link section in which the error occurs, and correcting an error in the diagnosis board or a link section determined as the error by an error correction command. The method of claim 15, wherein the main board, And when the error of the diagnosis board or the link section determined to be the error is corrected, performing the diagnosis between the board connected to the diagnosis board or the diagnosis board with the error corrected after the link section where the error is corrected. The method of claim 11, wherein the main board, Among the plurality of diagnostic boards, a diagnostic message having a unique index corresponding to the number of times of transmission to a diagnostic board for diagnosing an error is transmitted by a predetermined period, and a response message corresponding to a specific unique index or all unique indexes from the diagnostic board. The apparatus of claim 2, wherein the device is determined to be an error when no message is received. A plurality of diagnostic boards sequentially connected by a link and a main board managing the plurality of diagnostic boards, wherein the section connected by the link is a diagnosis in which an initial inter-board diagnostic command is instructed by the main board from a main board; A first diagnosis section connected to the board, the first diagnosis section being connected to the second diagnosis section from the main board to any diagnosis board of the first diagnosis section, and the first diagnosis section from any diagnosis board of the first diagnosis section. In a system divided into a third diagnostic section connected to a diagnostic board instructed by a diagnostic command, the main board determines whether a link section in which an error occurs among the links connecting the plurality of diagnostic boards using interprocessor communication (IPC). In the apparatus, Among the plurality of diagnostic boards, when the first inter-process communication is performed by notification of an inter-board diagnosis command with a specific diagnostic board, and the link state is determined to be an error as a result of performing the first inter-process communication, the main board is configured to be the first board. 1 Performs communication between any diagnostic board and the second process of the diagnostic section, When the link status is determined to be an error as the result of the second interprocess communication, the communication between any diagnostic board and the third process of the second diagnostic section is performed, and the link state is determined to be normal as the result of the second interprocess communication. The main board performing communication between an arbitrary diagnostic board of the third diagnostic section and a fourth process, And a plurality of diagnostic boards sequentially connected to the main board for transmitting a response message by inter-process communication of the main board. The method of claim 18, wherein the main board, And performing communication between processes with a diagnostic board last connected to the first of the plurality of diagnostic boards by informing the board-to-board diagnostic command. The method of claim 19, wherein the main board, Among the plurality of diagnostic boards, a diagnostic message having a unique index corresponding to the number of times of transmission to a diagnostic board for diagnosing an error is transmitted by a predetermined period, and a response message corresponding to a specific unique index or all unique indexes from the diagnostic board. The apparatus of claim 2, wherein the device is determined to be an error when no message is received.