JPH02185149A - Electronic exchange - Google Patents

Abstract

PURPOSE:To quickly obtain trouble information on the normal system side independently of the trouble recovery processing in a system where trouble occurs by providing a trouble information communication line through which trouble information used for trouble-shooting is reported between control systems. CONSTITUTION:A trouble information communication line 6 through which trouble information is reported between dual control systems 1a and 1b is provided between control systems 1a and 1b independently of an inter-system communication lie 2. When the occurrence of trouble is detected, a trouble information sending processing part 14 is started, and trouble information such as data required for trouble-shooting is quickly written in a shared memory 6. When the write of trouble information to the shared memory 6 is terminated, the system switching processing is started. Thus, the cause of the occurrence of the trouble is cleared and the trouble recovery processing is performed in accordance with trouble information outputted to a maintenance terminal 5b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a fault handling method in an electronic exchange with a redundant control system.

(Prior Art) In recent years, electronic exchanges have been progressing, and various electronic exchanges have been developed in which switching is controlled by a control system equipped with a CPU-based control device and memory. In addition, the above control system is duplicated, and one control system is replaced with a main system that executes control.
The other control system is used as a backup system in case of a failure in the exchange control, and when a failure occurs in the main system, the backup system is used to perform exchange control to take measures against the failure. In other words, the reliability of the switching control operation is ensured by switching the control system.

However, an electronic exchange with a dual control system, as shown in Figures 2 and 3, has two
An intersystem communication path 2 is provided between the two control systems 1a and lb, and data such as call processing in the main system is normally provided to the standby system via the intersystem communication path 2, so that the standby system is in a thermal standby state. When a failure occurs, the failure information save areas 3a, 3bs or each control system 1a are set on the memory constituting the control system 1a, lb.

After writing failure information to the external storage devices 4a and 4b connected to the 1b, respectively, the switching between the main system and the standby system is controlled.

The maintenance terminals 5a, 5b connected to the control systems 1a, lb, respectively, are stored in the fault information evacuation areas 3a, 3.
This is to investigate the cause of a failure that has occurred in the control system, and to take measures to recover from the failure, according to the failure information stored in the external storage devices 4a and 4b.

However, in an electronic exchange system configured in this way, after the fault has been recovered from the faulty control systems 1a and lb, the communication is transmitted to the other normal control system via the intersystem communication path 2. Since the fault information is notified by the system switching, there is a problem in that the control system operating as the main system cannot immediately obtain information about the fault that has occurred in the other system.

In particular, when a serious fault occurs and the faulty system is unable to start up by itself, the above-mentioned failure information cannot be notified because the intersystem communication path 2 is not established. there were.

(Problem to be Solved by the Invention) In the conventional electronic switching system having a redundant control system as described above, it is necessary to read the fault information of the faulty system only after the faulty system has been restored. There is a problem in that if the failure system cannot be recovered, it is impossible to read out any information necessary to investigate the cause of the failure.

The present invention was made in consideration of these circumstances, and its purpose is to promptly obtain failure information on the normal prefecture side without relying on failure recovery processing in the failure system. Our goal is to provide electronic switching equipment that can

[Structure of the Invention] (Means for Solving the Problems) The present invention has dual control systems, with one control system serving as a main system for executing exchange control and the other control system serving as a backup system in case of a failure in the exchange control. In the electronic exchange used, a fault information communication path is provided to notify the fault information used for investigating the cause of the fault between the control systems, and when a fault occurs, fault information is sent to the fault information communication path to each of the control systems. and means for receiving and inputting fault information provided to the fault information communication path.

(Function) According to the electronic exchange according to the present invention configured as described above, when a fault occurs in the control system functioning as the main system, the fault information is given to the fault information communication path, and the fault information is transmitted in parallel. Then, a system switching instruction is given via the intersystem communication path, and switching between the main system and the standby system is performed. Since the fault information communication channel can be accessed from both control systems, the normal prefecture side can obtain fault information from the fault information channel, regardless of whether the faulty system has recovered from the fault. be able to. As a result, it becomes possible to easily and quickly obtain fault information, investigate the cause of the fault, and effectively deal with that type of fault.

(Embodiment) Hereinafter, an electronic exchange according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic configuration of the control section of the electronic exchange according to the embodiment, where la and lb are duplicated control systems, 2
indicates an intersystem communication path provided between these control systems 1a and lb, and 5a and 5b indicate maintenance terminals connected to each of the control systems 1a and lb, respectively. One of the control systems 1a and 1b is used as a main system for executing switching control, and the other is used as a backup system to cope with the occurrence of a failure in the main system.

The control system acting as a standby system receives information such as call setting in the main system via the intersystem communication path 3, and is put on standby in a thermal standby state. When the standby system in this thermal reserve state is given a system switchover instruction due to the occurrence of a failure in the main system, it executes switching control in place of the control system that had been functioning as the main system, and It functions as a new main system.

However, the feature of this electronic exchange (control unit) is that fault information can be exchanged between the control systems 1a and lb independently of the intersystem communication path 2 described above between the duplex control systems 1a and lb. The problem lies in that a fault information communication path 6 is provided for notification. This fault information communication path 6 is made up of a shared memory that can be accessed by, for example, the recontrol systems 1a and lb, respectively, and the fault information is written and read under control from each of the control systems 1a and lb. The shared memory B is initialized by, for example, the main control system, and the information written to the shared memory 6 is reset after the control system in normal operation has investigated the cause of the failure. For example, this is performed after the failure information is written to an external storage device as a history of failure occurrence.

Each of the control systems 1a and lb has a function for accessing a shared memory (fault information communication path) 6 and writing the fault information to the shared memory 6 when a fault occurs, and a function for writing the fault information to the shared memory 6 during normal operation. Each of them has a built-in function to read out the fault information stored in the system and investigate the cause of the fault.

As shown in FIG. 1, each of the control systems 1a and lb includes a failure restart processing section 11. Initialization processing unit 12. Main program 13. It is configured to include a failure information transmission processing section 14 and the like.

The failure restart processing unit 11 is activated when the control system is powered on or when a failure occurs, and executes a predetermined system startup operation. Under the control of the failure restart processing section 11, the initialization processing section 12 is activated and predetermined initialization processing is performed.

The main program 13 mainly executes call processing, and at the same time notifies the call processing information to the standby system via the intersystem communication path 2, thereby putting the standby system in a thermal standby state. In addition, in the failure processing section of this main program 13, the shared memory B
The fault information stored in the maintenance terminal 5a is read out and the cause of the fault is investigated.

The failure recovery process, etc. is performed according to instructions from 5b.

Thus, the failure information transmission processing unit 14 is connected to the failure restart processing unit 11, the initialization processing unit 12. Also main program 1
3, it is activated when a failure occurs, and has the role of writing the failure information into the shared memory 6. After the failure information transmission processing section 14 writes the failure information into the shared memory 6, the failure restart processing section 11 is activated.

However, in the control system configured in this way, when the occurrence of a failure is detected during its operation, the failure information transmission processing unit I4 is activated, and the shared memory of the failure information such as data necessary for investigating the cause of the failure is activated. 8 is immediately written to. When the writing of the failure information to the shared memory 6 is completed, system switching processing is started.

Then, by starting the system switching process, the control system that has been functioning as a backup system starts up as the main system. Then, the main program 13 acquires the above-mentioned failure information from the shared memory B, which is the failure information communication path, and outputs it to the maintenance terminal 5b.

According to the fault information outputted to the maintenance terminal 5b in this way, the cause of the fault is investigated and the fault recovery process is performed.

If a failure occurs in the standby system, the failure information transmission processing unit 14 is immediately activated and the failure information is written into the shared memory 6. The main system monitors whether fault information in the standby system has been written to the shared memory 6, and if fault information exists, it is acquired and output to the maintenance terminal 5a.

As described above, fault information in the other control system is acquired via the shared memory 6, and the maintenance terminal 5a receives it.

5b.

According to the electronic exchange configured in this manner, when a failure occurs in the main system or the standby system, the failure information is promptly written to the shared memory (failure information communication path) 6 that can be accessed from each re-control system. It will be done. Then, by accessing the shared memory (fault information communication path) 7 from a normally functioning system, the fault information written therein is read out and the fault information is output to the maintenance terminals 5a and 5b. will be held.

As a result, it becomes possible to quickly obtain information on the fault in the other control system, and it becomes possible to quickly investigate the cause of the fault. Therefore, it becomes possible to effectively take countermeasures against failures. Furthermore, even if a faulty system cannot be started up due to the occurrence of a serious fault, the fault information can be reliably read out by the other control system, making it possible to take effective countermeasures against the fault.

Note that the present invention is not limited to the embodiments described above. For example, the configuration of the processing program in each control system, etc.
It may be determined according to the specifications of the exchange system, and the format of the failure information written to the shared memory 6 is not particularly limited.

In addition, the present invention can be implemented with various modifications without departing from the gist thereof.

[Effects of the Invention] As explained above, according to the present invention, information necessary for determining the cause of a failure occurring in a redundant control system can be obtained regardless of the success or failure of recovery processing of the failure system. Since it is possible to notify the other system, countermeasures against failures can be promptly taken and operational reliability can be greatly improved, which has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a schematic configuration example of a control unit of an electronic exchange according to an embodiment of the present invention, and FIGS. 2 and 3 are diagrams each showing a configuration example of a control unit in a conventional exchange. . la, lb...control system, 2...intersystem communication path, 4a
, 4b...External storage device, 5a, 5b...Maintenance terminal, 6...Fault information communication path (shared memory). Applicant's representative Patent attorney Takehiko Suzue Figure 2 Figure 3 Figure 1

Claims (1)

[Scope of Claims] An electronic switching system in which a control system including a control device and a memory is duplicated, and one control system is used as a main system for executing switching control, and the other control system is used as a backup system in case of a failure in the switching control. When a failure occurs in one of the control systems, the control system controls a failure information communication path for notifying the other control system of failure information, which is data necessary to investigate the cause of the failure in the control system. A means for transmitting fault information to the other control system via the fault information communication path when a fault occurs, and a means for notifying the other control system via the fault information communication path in each of the control systems; What is claimed is: 1. An electronic switching system characterized in that the electronic switching equipment is provided with means for receiving fault information sent to the electronic switching equipment.