KR100409176B1 - A method for switch board status management of atm switching system considering switching-over of the switch board - Google Patents

Abstract

The present invention relates to a switch board state management method considering switchboard redundancy switching in an asynchronous exchange system having a crossbar switchboard operated in redundancy.

The present invention includes a first step of setting an initial value for a flag indicating an active state of a crossbar switchboard and a periodic monitoring response result state, and then transmitting the crossbar switchboard state request signal; A second step of checking whether the periodic monitoring state of the crossbar switchboard is normal by using a state of a flag indicating the periodic response result state; And in the second step, when the states of the crossbar switchboard are all normal, resetting a flag indicating an active state of the crossbar switchboard to an initial value, and updating the monitoring state of the crossbar switchboard. The periodic monitoring process is configured, and in response to the crossbar switchboard status request signal in the periodic monitoring process, when the periodic switchboard status report signal from the crossbar switchboard is received, the monitoring status of each redundant crossbar switchboard is displayed. Setting a indicating flag and a periodic state request flag to a predetermined state, checking whether the switchboard is in transition, and updating the state of the crossbar switchboard only when the change is not made; In response to the crossbar switchboard status request signal in the periodic monitoring process, when a status change report signal of the board is received from the crossbar switchboard, a flag indicating a monitoring status of each of the redundant crossbar switchboards is set to a predetermined state. A fifth step of updating a state of the crossbar switchboard; And a sixth step of setting a flag indicating a control state of the crossbar switchboard to a normal state when the control OK signal of the crossbar switchboard is received as a response to the crossbar switchboard status request signal in the periodic monitoring process. By including the receiving process, it provides the effect of preventing duplicate operation information and function state mismatch.

Description

Status of Switch Board Management Considering Switch Board Redundancy in Asynchronous Switching System {A METHOD FOR SWITCH BOARD STATUS MANAGEMENT OF ATM SWITCHING SYSTEM CONSIDERING SWITCHING-OVER OF THE SWITCH BOARD}

The present invention relates to a switch board state management method in consideration of switch board redundancy switching in an asynchronous switching system. More specifically, when the periodic monitoring and switchover switching of the switch board are simultaneously operated in an asynchronous switching system, The present invention relates to a method for managing switch board state in consideration of switch board redundancy switching, which can prevent function state mismatch.

Currently, the ACE 2000 ATM switching system, which is one of the commercially available asynchronous switching systems, uses eight and 16 2.5 Gbps I / O switch ports where a crossbar switch board (CRIA: Cell Routing and Interconnection Hardware Assembly) is used as call processing resource. It can accommodate up to 32 devices, and it is redundantly operated with ASIDE and BSIDE.In other words, since it is a redundant board, if one side is active, the other side becomes standby, and the switch port included in the active side Cell transmission is performed only through the port. Ports included in the standby side do not transmit the cell.

Meanwhile, in such an ACE 2000 ATM switching system, an ATM cell transmitted from an outgoing subscriber board (AIM) is stored in an input / output buffer switch board (BPAA) connected to an outgoing subscriber board, and a crossbar Switched from a switch board (CRIA: Cell Routing and Interconnection Hardware Assembly) and transmitted to the input / output buffer switch board (BPAA) connected to the receiving subscriber board (AIM), stored, and then transmitted to the receiving subscriber board. In order to reliably connect the call between the subscriber and the subscriber, the state management of the crossbar switch board (CRIA) and input / output buffer switch board (BPAA) is required. The crossbar switch board transmits cells only through the switch ports included in the active side. Ports included in the standby side do not transmit cells. The switch board state management software in the upper switch management controller (SMC) transmits and receives Inter Process Communication (IPC) signals necessary for the switch board state management through the active side. Therefore, information about the active side of the crossbar switchboard is required for system operation.

The state management function of the switch board notifies the operator of the alarm state or the alarm release state of the switch board, which is known as the monitoring result of the switch board, by outputting an alarm message to the HMI window. In addition, since the crossbar switch board is operated in redundancy, the status management function of the switch board should detect and provide information on the active side and standby side to the operator.If the active side changes during operation, the active side status change message Outputs to the operator. In addition, it provides the function that the operator can switch the active side using I / O commands.

In order to maintain the normal status of the crossbar switch board as described above, the switch board controller periodically collects switch state information by using inter-processor communication between the switch board controller (DC) and the switch maintenance software. This is accomplished by detecting a change in the state of the switch board and immediately notifying the switch maintenance software. The state of the collected switch boards is recorded in the database. The status information of the switchboard maintained in the database is updated with accurate information in real time, and the operator should be notified immediately when a change of the status of the switchboard occurs.

After switching to the new active side by the operator command, it takes some time for the function of the active side switch controller (DC) to return to normal and to communicate with the upper switch board state management software. It is necessary.

If a switch board transfer request comes in when periodic monitoring is not in progress, only the crossbar switch board transfer result signal is not a problem since the switch board controller notifies the switch board status management software of the upper switch management controller.

However, if the operator inputs a command to switch the active side of the crossbar switch board (CRIA) during the periodic monitoring, the crossbar switch board controller informs the periodic monitoring result signal and the switchboard switching signal to the upper part almost simultaneously. do. The periodic monitoring signal information transmits the result of the state before the crossbar switch changeover command. If the upper switch board status management software receives the periodic monitoring signal and receives the switch switching result signal, the database is updated with normal status information and there is no problem, but if the switch switching result signal is received before the periodic monitoring signal, the switch switching result is received. After updating the status information on the database to the database, the status information about periodic monitoring is updated to the database. As a result, the new Active side switch controller becomes normal and temporarily until the next periodic monitoring proceeds. There is a problem that the information on the crossbar switch board is inconsistent. It also outputs a crossbar switch board active side status change message to the operator.

Therefore, in order to prevent inconsistency between the redundant operation information and the function status, when the upper switch board status management software receives the crossbar switch board status monitoring signal, it should be able to determine whether the switch board controller is in transition, and the crossbar switch board change over command When entered, it should be possible to determine if periodic monitoring is in progress.

That is, in the past, since the state monitoring of the switch board operated by redundancy and the switch board redundancy switching are separately designed and implemented, the redundant operation information inconsistency occurs.

The present invention has been made under the technical background as described above, and when the periodic monitoring and redundancy switching of the switch board are simultaneously operated in an asynchronous exchange system, by performing the state management of the switch board in consideration of the redundancy switching of the switch board, the switch board It is an object of the present invention to provide a switch board state management method in consideration of switch board redundancy switching, which can prevent inconsistent operation information and function state mismatch.

1 is a structural diagram of an ACE 2000 ATM switching system to which the present invention is applied.

2 is a state management relation schema of a crossbar switch board maintained in a database in the system of FIG.

3 is an interaction diagram of information shared and used between a crossbar switch board state monitoring process and a process for performing switch board redundancy switching according to the present invention.

Figure 4 is a flow chart illustrating the operation of the periodic monitoring signal transmission process of the switch board state management method according to the present invention.

Figure 5 is a flow chart illustrating the operation of the external signal receiving process of the switch board state management method according to the present invention.

Figure 6 is a flow chart illustrating a switch board redundancy transfer method according to the present invention.

7 is a message content used in a periodic monitoring result of a switch board applied to the present invention.

Explanation of symbols on the main parts of the drawings

1: Switch Fabric Module

2: Main Processor Module

3: ATM Interface Module

4: Work-Station Module

11: I / O buffer switch board 12,17: device controller

13,14: crossbar switch board 15: crossbar switch

16: arbiter 31: periodic monitoring processor

32: switchboard switching process

The switch board state management method of the present invention for achieving the above object,

In the switchboard state management method of an ATM switching system having a crossbar switchboard operated in redundancy,

A first step of setting an initial value for a flag indicating an active state of the crossbar switchboard and a periodic monitoring response result state, and then transmitting the crossbar switchboard state request signal;

A second step of checking whether the periodic monitoring state of the crossbar switchboard is normal by using a state of a flag indicating the periodic response result state; And

When the state of the crossbar switchboard is all normal in the second step, and reset the flag indicating the active state of the crossbar switchboard to the initial value, and updating the monitoring state of the crossbar switchboard Periodic monitoring processes,

In response to the crossbar switchboard status request signal in the periodic monitoring process, when a periodic switchboard status report signal from the crossbar switchboard is received, a flag indicating a monitoring status of each redundant crossbar switchboard and a periodic status request flag Setting to a predetermined state and checking whether the switchboard is being transferred to update the state of the crossbar switchboard only when the switching is not performed;

In response to the crossbar switchboard status request signal in the periodic monitoring process, when a status change report signal of the board is received from the crossbar switchboard, a flag indicating a monitoring status of each of the redundant crossbar switchboards is set to a predetermined state. A fifth step of updating a state of the crossbar switchboard; And

In response to the crossbar switchboard status request signal in the periodic monitoring process, when the control OK signal of the crossbar switchboard is received, an external signal receiving process comprising a sixth step of setting a flag indicating a control state of the crossbar switchboard to normal Characterized in that it comprises a.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 is a structural diagram of an ACE 2000 ATM switching system to which the present invention is applied.

The ACE 2000 ATM Switching System includes Switch Fabric Module (SFM), a switch network module, ATM Interface Module (AIM), and main processor module (MPM). 2), and a workstation module (WSM: Work-Station Module) (4).

The switch fabric module 1 was primarily developed as a system having a capacity of 20 Gbps, and the final system has a capacity of 40 Gbps or more and 80 Gbps, and is developed to be configured to 160 Gbps when expanded.

The switch fabric module 1 includes a plurality of input / output buffer switch boards (BPAA) and crossbar switch boards (CRIA: Cell Routing and Interconnection Hardware Assembly) (13, 14).

The crossbar switch boards 13 and 14 are formed of crossbar switches 15 of ASIDE and BSIDE. The crossbar switch 15 is a space-dividing switch, and does not directly switch cells arriving at respective ports, but rather to the input buffer. Temporarily save. This is to avoid collision between switch output ports, and the cells stored in the input buffer are switched after the output contention is controlled by the control of the cell arbiter 16.

The input / output buffer switch board 11 is an input and output buffer hardware block having an interface of 2.5 Gbps capacity. The input / output buffer switch board 11 is connected to the subscriber matching module 3 to transmit and receive user cells, and is connected to the crossbar switch boards 13 and 14 in the switch fabric module 1 to exchange input user cells. Perform the function. The input / output buffer switch board 11 functions as an input buffer for temporarily storing a cell transmitted to the crossbar switch 15 at the front end of the crossbar switch boards 13 and 14 and routing for matching with the cell arbiter 16. It has a function of transmitting and receiving request information and permission information.

The capacity per switching port is 2.5 Gbps, but the capacity per subscriber interface port accommodates more than STM-4c level. Therefore, it is necessary to perform the function of switching the switch output 2.5 Gbps back to STM4c X 4 port. For this purpose, it has an output buffer and switching function. If the capacity per subscriber interface port is STM-16c, no output switch function is required.

Since the switch basically has a switch interface (SIX: Switch Interface) 18 and has an interface of STM-16c or more, the input data of the subscriber board 3 is converted into the STM-16c through the multiplexer, and the subscriber board ( In case of transmission to 3), it is output by demultiplexing. The timing information necessary for the operation uses the timing information transmitted from the crossbar switch boards 13 and 14 using the signal link, and generates and uses a local timing signal.

The crossbar switch boards 13 and 14 have an input / output buffer switch board 11 and a cell path and an arbitration signal path. The matching for this path is called a Gigabit interface (GIX). The arbiter 16 of the crossbar switchboards 13 and 14 receives status information of how many cells are waiting in the virtual output queue of the input / output buffer switchboard 11 and uses this information for scheduling and arbitration. And transmits the result back to all the crossbar switch boards 13 and 14. For this purpose, the input / output buffer switch board 11 and the arbiter 16 have a Gigabit Interface for Signaling (GIXs), and the input / output buffer switch notified of the mediation result from the arbiter 16 through the signal gigabit interface. The board 11 reads the cell from the corresponding virtual output queue (VOQ) designated by this information and transmits it to the crossbar switch 15 of the crossbar switch boards 13 and 14. In order to transmit / receive cells between the input / output buffer switch board 11 and the crossbar switch 15, the crossbar switch boards 13 and 14 and the input / output buffer switch board 11 are data gigabit interfaces (GIXd: Gigabit Interface). for Data). These two interfaces, GIXs and GIXd, are called Gigabit Interfaces (GIX).

The interprocess communication cell transmitted from the device controller (DC) 12 to the main processor module 2 is transferred to the input buffer of the input / output buffer switch board 11, and in the input buffer, the cell is equal to the general user cell. Contention is delivered to the main processor module 2 via the crossbar switch.

The interprocess communication cell transmitting from the main processor module 2 to the device controller 12 is transferred from the main processor module 2 to the input buffer via the subscriber board 3 and temporarily stored in the input buffer. Via the arbitration function, it is transmitted to the output buffer of the destination input / output buffer switch board 11. In the output buffer, subport switching is performed and then transmitted through a UTOPIA interface with the device controller 12.

The main processor module 2 is a switch management controller (SMC) 21, an ATM call controller (ACC) 22, a media gateway controller (MGC) 23. Each processor is loaded with call processing software and operation maintenance software.

Software for maintaining the state of the crossbar switch board to which the method proposed by the present invention is applied is loaded on the switch management controller 21 and uses the interprocessor communication with the device controller 17 inside the crossbar switch boards 13 and 14. It is operated by communication.

FIG. 2 illustrates a state management relation schema of a crossbar switch board maintained in a database in the system of FIG. 1.

As described above, the crossbar switch boards 13 and 14 are mounted and operated as ASIDE and BSIDE. The key of this relation is the SIDE information of the crossbar switch board. When operating in redundancy, if one board is active, the other board is operating in standby state, so an attribute of each board's redundancy information is required. The physical state of the board consists of the EJECT state, POWER state, FUNCT state, CLOCK state, and SUPERVISION state. Each state is managed by classifying normal cases as NORMAL and failure cases as FAULT.

3 is an interaction diagram of information shared and used between a crossbar switch board state monitoring process and a process for performing switch board redundancy switching according to the present invention. Although the monitoring method may be used as a structure for transmitting a signal and receiving a response from the same process, when there are many kinds of periodic monitoring signals for the same object, a method of separating the transmitting process from the receiving process is efficient in terms of system resource management.

When a switch board state management software block is loaded and started to operate in the switch management controller 21, the periodic supervision process 31, which is a periodic supervisory signal transmission process, and a periodic / continuous supervisory signal reception process, An external signal receiving process 33 is started to perform switch board state monitoring. The SwitchOver SWBD Active Side Process (32), which is a switchboard switchover processing process, allows an operator to input an active side switchover command of the crossbar switch boards 13 and 14 using a man machine command (MMC). This is the program that is run to execute this command.

In FIG. 3, A_PrdSpvReq_FLAG 34 is a flag representing a periodic monitoring request state for the crossbar switchboard ASIDE, and a range of values is TRUE and FALSE. Here, TRUE means that the periodic monitoring process 31 sends a periodic status request signal to the switch controller of the crossbar switchboard ASIDE. FALSE means that the watchdog cycle has not yet returned and the periodic status request signal has not been sent.

B_PrdSpvReq_FLAG 36 is a flag representing the periodic monitoring request status for the crossbar switchboard BSIDE. The range of values is TRUE and FALSE. TRUE means that the periodic monitoring process 31 sends a periodic status request signal to the switch controller of the crossbar switchboard BSIDE. FALSE means that the watchdog cycle has not yet returned and the periodic status request signal has not been sent.

A_CRIA_SPV_FLAG (35) is a flag representing the state of periodic monitoring response result for the crossbar switchboard ASIDE. The range of values is NORMAL, FAULT. NORMAL sends a periodic monitoring response signal to the switch board state management software block of the switch management controller by the switch controller of the crossbar switchboard ASIDE that receives the periodic monitoring request signal, and the external signal receiving process 33 receives the periodic monitoring response signal. By receiving, it means that the monitoring state of each other is normal. FAULT means that the external signal receiving process 33 does not receive the periodic monitoring response signal, so that the communication status between them is abnormal.

B_CRIA_SPV_FLAG 37 is a flag representing the state of periodic monitoring response results for the crossbar switchboard BSIDE. The range of values is NORMAL, FAULT. NORMAL sends a periodic monitoring response signal to the switch board state management software block of the switch management controller by the switch controller of the crossbar switchboard BSIDE that receives the periodic monitoring request signal, and the external signal receiving process 33 receives the periodic monitoring response signal. By receiving, it means that the monitoring state of each other is normal. FAULT means that the external signal receiving process 33 does not receive the periodic monitoring response signal, so that the communication status between them is abnormal.

CRIA_OK_FLAG 38 is a flag indicating whether the function of the switch controller firmware on the active side of the crossbar switchboard is normal. The range of values is TRUE and FALSE. TRUE indicates that the function of the firmware is operating normally, and FALSE indicates that the function of the switch controller firmware, which has been transferred to the active side, is still alive and is still abnormal.

The periodic monitoring process 31 is always a live program. Since monitoring did not proceed before sending the status request signal to the switch board controller periodically, assign A_CRIA_SPV_FLAG (35) to FAULT (3.10) and assign B_CRIA_SPV_FLAG (37) to FAULT (3.12). After the periodic monitoring request signal is sent to the switch board controller, A_PrdSpvReq_FLAG 34 is assigned to TRUE (3.9), and B_PrdSpvReq_FLAG 36 is assigned to TRUE (3.11).

When the response signal is received from the switch board controller of ASIDE, it responds to the monitoring request and assigns the existing monitoring request state A_PrdSpvReq_FLAG (34) to FALSE (3.13). Assign (3.14).

When the response signal is received from the switch board controller of BSIDE, it responds to the monitoring request. Therefore, B_PrdSpvReq_FLAG (36), which is the existing monitoring request status, is assigned to FALSE (3.15) .B. (3.16).

When the switchboard switchover process 32 requests a switchover to the switch controller and receives a response from the switch controller indicating that the switchboard switchover result was successful, the newly active side controller needs time to start, so periodic monitoring is performed. Set CRIA_OK_FLAG (38) to FALSE (3.17) to not accept signals or other switchboard switch commands. The newly active switch board controller starts a normal operation and transmits a signal indicating that it is operating in a stable state. When the external signal receiving process 33 receives the signal, the CRIA_OK_FLAG 38 is allocated to TRUE (3.18).

When the external signal receiving process 33 receives the status report signal of the crossbar switch board, it checks whether CRIA_OK_FLAG (3.8) is TRUE, and only if it is TRUE, the switch board controller determines the current correct state of the upper switch board state management software. Since the block can be notified, it calls the switchboard status update program.

Therefore, there should be a part in the periodic monitoring process 31 that assigns CRIA_OK_FLAG 38 to TRUE. The periodic monitoring process 31 should assign CRIA_OK_FLAG 38 to TRUE if either A_CRIA_SPV_FLAG 35 or B_CRIA_SPV_FLAG 37 is NORMAL. This prevents the situation where the external signal reception process (3.3) does not receive another periodic signal and cannot process it even if it does not receive a signal that the newly activated switch board controller is operating normally and operating in a stable state. To do that.

Figure 4 is a flow chart illustrating the operation of the periodic monitoring process of the switch board state management method according to the present invention.

The periodic monitoring process sends a crossbar switch board status request signal to the device controllers 17 of the crossbar switchboard ASIDE and BSIDE, sleeps for a predetermined time, and then performs only the same crossbar switch board status request signal transmission task in the next cycle. Is the process.

When the periodic monitoring process begins (411), assigns CRIA_OK_FLAG to TRUE (412), and A_CRIA_SPV_FLAG to FAULT (413). Assign B_CRIA_SPV_FLAG to FAULT (414). Next, a crossbar switchboard status request signal is sent to the switchboard controller (415).

Since the periodic monitoring process of the switch management controller 21 has sent the periodic status request signal to the device controller 17 of the switch board, assigns A_PrdSpvReq_FLAG to TRUE (416), and assigns B_PrdSpvReq_FLAG to TRUE (417). The external signal reception process of the switch management controller 21 sleeps and waits for an appropriate waiting time until the response signal is received from the device controller 17 of the switch board (418).

Next, if A_CRIA_SPV_FLAG is FAULT or B_CRIA_SPV_FLAG is FAULT (419), the board controller has not received a response from the device controller 17 of the switch board. The request signal is transmitted (420). Subsequently, the external signal receiving process sleeps and waits for an appropriate waiting time until receiving the response signal from the switch board controller (421).

Next, if it is determined whether A_CRIA_SPV_FLAG is NORMAL or B_CRIA_SPV_FLAG is NORMAL (422), if the condition is satisfied, it is determined that the state of the switchboard controller that is ACTIVE is good, and CRIA_OK_FLAG is assigned to TRUE (423), and the switch board monitoring state is determined. Update to the database (424). If A_CRIA_SPV_FLAG and B_CRIA_SPV_FLAG are both FAULT in step 422, the switch board monitoring status is updated to the database (424).

5 is a flowchart illustrating an operation of an external signal receiving process in the switch board state management method according to the present invention.

The external signal receiving process receives a signal transmitted from the device controller 17 of the switch board, assigns the values of A_CRIA_SPV_FLAG and B _CRIA_SPV_FLAG representing the monitoring state with the crossbar switch board controller to NORMAL and updates the crossbar switch board state. Function to call a program.

First, when the external signal receiving process is started (511), it operates in a state capable of receiving a signal transmitted from the outside. The signals received by the external signal reception process, which is required for crossbar switch board status management, include the signals for periodic crossbar switch board status reporting, the signals for reporting crossbar switch board status changes, and the functions of the newly switched crossbar switch board controller. It consists of a crossbar switchboard control OK report signal to indicate normal operation.

When the periodic monitoring process requests status information from the switchboard controller, the switchboard controller sends a periodic crossbar switchboard status report signal in response. If the switchboard controller detects a board state change, it sends a crossbar switchboard state change report signal. When the operator requests the active side switchover with a man-machine command, if the function of the newly activated controller operates normally after the crossbar switch board is transferred, the newly activated switchboard controller sends a crossbar switchboard control OK report signal. Send.

When a periodic crossbar switchboard status report signal is received (512), it is checked whether the SIDE that informed this signal is ASIDE (515). If it is determined in step 515 that the signal is received from the ASIDE, A_CRIA_SPV_FLAG is assigned to NORMAL because the monitoring is operating normally (516), and A_PrdPbaReq_FLAG is assigned to FALSE since the periodic request is answered (517).

If it is determined in step 515 that the signal is received from the BSIDE, B_CRIA_SPV_FLAG is assigned to NORMAL because the monitoring is operating normally (518), and B_PrdPbaReq_FLAG is assigned to FALSE since the periodic request is answered (519). .

If the switchboard switch command is input before sending the periodic monitoring request signal to the device controller of the switch board and receiving the signal in response, the value of the periodic monitoring response signal becomes meaningless even after receiving the periodic monitoring response signal. Therefore, when receiving a response signal for the periodic monitoring request, it is checked whether CRIA_OK_FLAG is TRUE (520). If CRIA_OK_FLAG is TRUE in step 520, since the switch board switching is not in progress, the periodic monitoring response signal is a valid signal, thereby updating the crossbar switch board state (521). If CRIA_OK_FLAG is FALSE in step 520, switch board switching is in progress, and thus, the received periodic monitoring response signal is ignored and the standby state is entered.

Next, when the crossbar switchboard state change report signal is received (513), it is checked whether the SIDE reporting the signal is ASIDE (522). If it is determined in step 522 that the signal is received from the ASIDE, since monitoring for the continuous change is operating normally, A_CRIA_SPV_FLAG is assigned to NORMAL (523). If it is determined in step 522 that the signal is received from the BSIDE, B_CRIA_SPV_FLAG is assigned to NORMAL (524) because the monitoring for the continuous change is operating normally. The signal that the device controller of the crossbar switchboard knows and notifies of the switchboard state change is possible when the active side operates normally. Therefore, the crossbar switchboard state is updated without checking the CRIA_OK_FLAG state (525).

When the crossbar switchboard control OK report signal is received (514), CRIA_OK_FLAG is allocated to TRUE because it is a signal indicating that the new Active Side is operating normally (526).

Next, after processing the received signal, it returns to the ready state to receive another signal.

6 is a flowchart illustrating a switch board redundancy transfer method according to the present invention. The switchboard changeover process is executed when the operator inputs a command to change the active side of the redundant crossbar switch board, sends a signal to switch the active side to the device controller of the switchboard, and then transfers the change result from the switch controller. Perform the function of receiving.

When the switchboard switchover process is started (611), it is checked whether the SIDE requested by the operator to change the active side is ASIDE (612). In step 612, if Side requested as Active is ASIDE, it is checked whether A_PrdPbaReq_FLAG is TRUE (613). If A_PrdPbaReq_FLAG is TRUE, the current switch board state monitoring is periodically requested by the switch controller, and sleeps and waits for the appropriate time necessary to complete the periodic monitoring (614). In step 612, if the side requested to be active is BSIDE, it is checked whether B_PrdPbaReq_FLAG is TRUE (615). In step 615, if B_PrdPbaReq_FLAG is TRUE, since the current switch board state monitoring is being periodically requested to the switch controller, it sleeps and waits for the appropriate time necessary for the periodic monitoring to end (616). Next, a signal for switching the active side to the switchboard controller is transmitted (617).

In response to the step, if a switchboard switchover result signal is received (618), it is checked whether the switchover result of this signal is OK (619). If the transfer result in step 619 is OK, since the switch controller of the newly active side is alive, it takes time until the function of the newly activated side goes to normal, and thus the external signal transmission process during this period. CRIA_OK_FLAG is assigned to FALSE to ignore the periodic monitoring signal received by the user (620), the Active and Standby information according to the switchboard switchover result is updated in the database (621), and the switchboard switchover command program is terminated (623). ).

In step 619, if the switch board switching result is not OK, no switch board switching is performed, and thus there is no controller that is newly activated, and therefore, the periodic monitoring signal can be processed even if the external signal receiving process receives it. Can be. Therefore, the switch board transfer command program is terminated without setting a value in CRIA_OK_FLAG (623).

In step 617, when a signal is transmitted to the switchboard controller to switch the active side, but if the transfer result does not come and timeout occurs (622), switchboard switching is not performed, and thus there is no newly active controller. Therefore, the periodic monitoring signal can be processed even if the external signal receiving process receives it. Therefore, the switch board transfer command program is terminated without setting a value in CRIA_OK_FLAG (623).

7 shows message contents used for periodic monitoring results of a switch board according to the present invention.

In FIG. 7, the status result message of the crossbar switch board includes the SIDE information (7.1) of the switch board, the redundant operation mode of the switch board (7.2), the EJECT state of the counterpart board (7.3), the POWER state of the counterpart board (7.4), It includes the FUNCT state (7.5) of the opponent board, the FUNCT state (7.6) of the magnetic board, and the CLOCK state (7.7) of the magnetic board. Since the crossbar switch board is composed of ASIDE and BSIDE, the ASIDE switch controller can know the status of BSIDE, and the BSIDE switch controller can know the status of ASIDE and use it in the crossbar switch board status result message. SIDE information (7.1) of the switch board is divided into ASIDE and BSIDE. The redundant operation mode (7.2) is divided into ACTIVE and STANDBY. The remaining states are divided into normal cases by NORMAL and failure cases by FAULT.

As described above, during the ACE 2000 switching system, the upper switch board status management software running on the switch management controller performs a periodic monitoring of the switch board, and inputs a command that requires the operator to switch the ACTIVE SIDE of the switch board. In this case, the lower switch board controller notifies the upper part of the periodic monitoring result signal and the switch board switching signal. The periodic monitoring signal information transmits the result of the state before the switch change command. If the upper switch board status management software receives the periodic monitoring signal and receives the switch switching result signal, the database is updated with normal status information, and there is no problem. However, if the switch switching result signal is received before the periodic monitoring signal, the switch switching result is received. After updating the status information on the database to the database, the status information about periodic monitoring is updated to the database. As a result, the new ACTIVE SIDE switch controller becomes normal and temporarily switches until the next periodic monitoring proceeds. There is a problem that the information on the board is inconsistent. It also outputs a switchboard ACTIVE SIDE status change message to the operator.

Therefore, in order to prevent inconsistent redundancy operation information and function status, when the upper switch board status management software receives the switch board status monitoring signal, it should be able to determine whether the switch board controller is transferring, and the switch board change command is inputted. It should be possible to determine if periodic monitoring is in progress. As described above, the present invention proposes a switch board state management method in consideration of switchboard redundancy switching, thereby providing an effect of preventing inconsistency in redundancy information and function state.

Claims (4)

In the switchboard state management method considering switchboard redundancy switching of ATM switching system having crossbar switchboard operated by redundancy, A first step of setting an initial value for a flag indicating an active state of the crossbar switchboard and a periodic monitoring response result state, and then transmitting the crossbar switchboard state request signal; A second step of checking whether the periodic monitoring state of the crossbar switchboard is normal by using a state of a flag indicating the periodic response result state; And When the state of the crossbar switchboard is all normal in the second step, and reset the flag indicating the active state of the crossbar switchboard to the initial value, and updating the monitoring state of the crossbar switchboard Periodic monitoring processes, In response to the crossbar switchboard status request signal in the periodic monitoring process, when a periodic switchboard status report signal from the crossbar switchboard is received, a flag indicating a monitoring status of each redundant crossbar switchboard and a periodic status request flag Setting to a predetermined state and checking whether the switchboard is being transferred to update the state of the crossbar switchboard only when the switching is not performed; In response to the crossbar switchboard status request signal in the periodic monitoring process, when a status change report signal of the board is received from the crossbar switchboard, a flag indicating a monitoring status of each of the redundant crossbar switchboards is set to a predetermined state. A fifth step of updating a state of the crossbar switchboard; And In response to the crossbar switchboard status request signal in the periodic monitoring process, when the control OK signal of the crossbar switchboard is received, an external signal receiving process comprising a sixth step of setting a flag indicating an active state of the crossbar switchboard to normal Switch board state management method in consideration of switch board redundancy switching in an asynchronous exchange system comprising a. The method of claim 1, And after the first step is performed, retransmitting a status request signal of the crossbar switchboard when the flag indicating the periodic response result state of the crossbar switchboard maintains an initial setting value. Switch board state management method considering switch board redundancy switching in asynchronous switching system. The method of claim 1, In the fourth step, the check whether the crossbar switchboard is in transition is determined by determining the state of the flag indicating the active state of the crossbar switchboard Switch board state in consideration of switchboard redundancy switching in the asynchronous switching system How to manage. The method of claim 3, If it is determined that the crossbar switchboard is in transition from the state of the flag indicating the active state of the crossbar switchboard, the switchboard in the asynchronous exchange system enters a standby state without updating the state of the crossbar switchboard. How to manage switch board state with redundancy switching.