JPH02121452A - Electronic exchange system - Google Patents

Abstract

PURPOSE:To prevent hindrance in the system operation even if a standby system processor is not raised by storing the information representing whether or not the standby system processor is raised from a system information table set to an active system processor. CONSTITUTION:A system status table 6 specifies one of plural processors 1, 2 as an active system processor 1, and when the execution of the exchange such as call processing is started after the system is raised, the status is set depending whether a standby system processor 2 is raised or not, and when the raising is implemented, the status set is applied. Thus, the active system processor 1 references the system status table 6 to check the state of the standby system processor 2 and even if the confirming processing of the system normality of the system due to the system changeover is started, since the standby system processor 2 is not operated, the exchange control is not interrupted and the initializing processing of the processor and the confirming processing of the normality of the system are implemented efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an electronic switching system having a redundant processor-based control system.

(Prior Art) Recently, various types of electronic exchange systems have been advanced, and various service functions have come to be realized. It is necessary to improve the reliability of this type of electronic switching system (
One of the plurality of processors is used as an active system processor for executing exchange control such as call processing, and the other processor is used as a PFI standby system processor for dealing with the occurrence of a failure in the above-mentioned active system processor. Switching between the active processor and the standby processor is performed. Note that the standby processor is normally placed in a thermal standby state, and receives call setting information and the like from the active processor and is put on standby in case a failure occurs in the active processor.

By the way, in such an electronic switching system in which the control system (processor) is duplicated, for example, during operation of the system, a normality check process is performed to check whether the backup system processor is reliably started up when the system is switched. Specifically, without interrupting call processing and control by the active processor, system switching is performed as a periodic system process, data necessary for call control is transferred from the active processor to the standby processor, and then The normality of the standby processor is confirmed by starting it as a new active processor and continuously executing operational services such as call processing. In this case, the processor that has been used as the active processor is used as the new standby processor after its initialization process and the like are performed.

Note that switching between the active system and the standby system may be performed manually using a command from a maintenance terminal.

However, such system normality confirmation processing is performed on the premise that the standby processor functions normally. Therefore, if the standby processor has not been started, problems such as call processing and other services being executed by the active processor may be interrupted due to its normality confirmation process. .

In particular, if system switching is performed as a periodic process in the system without interrupting call processing control in the active processor, this may actually cause a failure.

(Problem to be Solved by the Invention) In this conventional electronic switching system, the control system is duplicated, and the system normality is confirmed by periodic system switching without interrupting call processing, etc. In this case, if the standby processor is not started, it is not only impossible to confirm the above normality, but also
Problems such as interruption of the above-mentioned call processing control occurred.

The present invention has been made in consideration of the above circumstances, and its purpose is to enable the active processor to perform periodic call processing without interrupting its call processing, etc., when the standby processor is not activated. Even in cases where system health confirmation processing is performed through system switching,
It is an object of the present invention to provide an electronic switching system that does not cause the above-mentioned problems such as system failures.

[Structure of the Invention] (Means for Solving the Problems) The present invention includes an active processor and a plurality of processors used as backup processors for the active processor, and interrupts call processing, etc. in the active processor. In an electronic switching system that performs system normality confirmation processing through periodic system switching without interruption, information is stored as to whether or not a standby processor is set for the processor used as the active processor. A system information table is provided, and when a system switchover request is generated from the active processor as a periodic process for checking system normality, the system information table is referenced and the system switchover is controlled. That is.

Specifically, it refers to the system information table and executes system switching processing only if the standby processor has been started, and if the standby processor has not started up, restarts the active processor. It is characterized by the fact that it is made to do so.

(Function) According to the present invention, the system information table set for the active processor stores information indicating whether or not the standby processor has been started. Even if system switching requests are generated periodically without interrupting call processing, etc., by referring to the system information table above, you can either start up the standby processor and execute system switching, or It becomes possible to determine whether it is appropriate to start up the system processor +Ij and return to the original state.

As a result, even if the standby processor is not activated, there is no problem in system operation.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram for explaining the general configuration of an electronic exchange system according to an embodiment and its operation.

This electronic switching system includes a plurality of processors 1 and 2 (two in this case), one of which is an active processor that executes switch control such as call processing, and the other is a standby processor that handles failures in the active processor. It is used as a system processor, and is configured to ensure operational reliability by switching between the active system and the standby system in the event of a failure. still,
The I10 control device 3 inputs various commands from the maintenance terminal 4 to each of the processors 1.2, and
The output information is outputted to the maintenance terminal 4.

The feature of this system is that the processor used as the active processor (processor L in this case) is provided with a system status table 6 for storing information as to whether or not the standby processor is activated. It is at the point where it can be done. When a system switching request is made from the maintenance terminal 4 or when a system switching request occurs as a periodic process of the system, the system status table 6 is referred to and the system switching is controlled.

That is, the system status table 6 specifies one of the plurality of processors as the active processor, and when it is activated and execution of switch operations such as call processing is started, the standby processor is activated. The state is set depending on whether the Further, if the standby processor is started up while the active processor is in operation, the status is set in the system status table 6 at that point in time.

With the state information of the 100-system processor stored in the system state table 6 in this manner, the active processor executes a series of switch control operations such as call processing in accordance with a predetermined program. For example, the active processor periodically generates a system switching request to confirm the system's normality during a series of processing steps, or requests the maintenance terminal 4
A system switching request is generated with the instruction F. At this time, the active processor refers to the system status table 6 and checks the status of the TR processor.

And']'-When the backup system processor is in operation, its information is stored in the system status table 6, and from this information it is confirmed that the backup system processor is capable of operation. As shown in FIG. 1(a), the system processor transfers data to the standby system processor, requests startup, and executes system switching.

On the other hand, when the standby processor is not operating, the system status table 6 stores information indicating that only the active processor is operating. Therefore, in this case, the active processor is in the system state table 6.
I learned that the standby processor was not working, and the first
As shown in Figure (b), the process of restarting the active system processor, which is its own system, is executed. Through this restart processing, necessary initialization processing of the active processor is performed, and switching control such as call processing during operation is continued.

Therefore, even if processing is started to check the system's normality during system operation, this prevents system switching from being performed involuntarily, and maintains the continuity of switch control such as call processing during operation. becomes possible. This processing brings about effects such as making it possible to appropriately execute the initialization processing of the active processor in operation.

It should be noted that the present invention is not limited to the embodiments described above, and can be implemented with various modifications without departing from the gist thereof.

[Effects of the Invention] As explained above, according to the present invention, even if system health confirmation processing is started by system switching, which is performed on the premise that the standby system is in operation, the standby system processor remains in operation. Even if there is only one processor in operation, processor initialization processing and system normalization can be performed in the same way as when system switching is performed. This has great practical effects, such as making it possible to efficiently perform gender confirmation processing and the like.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are schematic diagrams for explaining the general configuration and operation of an electronic exchange system according to one embodiment of the present invention. 1.2... Processor, 3... I10 control device, 4... Maintenance terminal, 6... System status table.

Claims (1)

[Scope of Claims] In an electronic switching system equipped with an active processor and a plurality of processors used as backup processors for the active processor, whether or not the processor used as the active processor is set as a backup processor. What is claimed is: 1. An electronic switching system characterized in that a system information table is set to store information on whether or not the system is switched, and when a system switching request is issued from an active processor, the system information table is referenced to control the system switching.