JPH0220031B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a restart processing method that involves call relief when switching due to a system failure occurs in an electronic exchange having regular and standby equipment.

In systems that strictly require continuous operation, such as electronic exchanges, if an abnormality occurs in the system's operation and the call processing function stops, it is necessary to detect the abnormality and
It is necessary to perform processing such as removing the cause of the abnormality and restart call processing, that is, restart processing. In the conventional call rescue method using restart processing, it is determined whether each call is a rescue call, that is, whether it is in a state to be rescued such as ringing or talking, based on the call information remaining in memory.
It is determined whether the call is in a non-relief state, such as during dialing or in an unstable state during transition to the digit sending state after dialing. Initialize and
For rescue calls, a series of processing was performed to set necessary call information. Therefore, even if this required time is reduced to almost zero by shortening or omitting processing such as file loading and memory initialization during restart processing, the time required for call rescue cannot be reduced, and call processing must be performed during that time. The problem was that the exchange function was interrupted until the system started up.

On the other hand, in a system that adopts a duplex configuration and constantly operates the regular system and standby system in synchronization, if the regular system stops, it is possible to rescue calls by simply switching to the standby system, but the program If the system stops due to a bug, restart processing as described above is required in the switched system, making continuous operation difficult.
Service quality and reliability were lacking.

SUMMARY OF THE INVENTION An object of the present invention is to provide a restart processing method in a backup system of a duplex system that can immediately start up the backup system at the time of switching, in order to eliminate the drawbacks of the prior art described above.

The present invention provides that when the state of a relief call is specified as ringing or talking, the call information in the memory to be set and the path of the communication path equipment are uniquely determined based on the call state number and path information. Focusing on this, the call is always judged whether it is a rescue call or not, and if it is a rescue call, the rescue call information is set in the corresponding protection memory, and the path information is set in the protection communication path equipment. In addition, in the case of non-relief calls, by making initial settings for each, it is possible to immediately operate the standby system without having to perform these setting processes again when the system is switched, thereby eliminating call interruptions. This is a characteristic feature.

Hereinafter, the present invention will be explained in detail with reference to Examples.
FIG. 1 shows an embodiment in which the present invention is applied to a switching system having dual control processors and communication line equipment. , order read/write control devices 18 and 20 are provided.

In the figure, the control processor 11 is a regular processor, and performs exchange processing with the memory 13 and communication path system device 15 as regular processors. On the other hand, the control processor 12, memory 14, communication path system device 16
It has a dual configuration, with each having a spare. In addition, in the spare memory 14,
When the station was constructed, the same programs and data as those in the regular memory 13 were already stored.

When the entire system is operating normally, the control processor 1
1 is an unstable state in which the call being processed is always in a relief state such as ringing or talking, or is in a dialing state or transitions to a digit sending state after dialing is completed. It is determined whether the situation is in a non-remedy state. If the call is in a relief call state, the necessary call information (state number, trunk memory, monitoring memory, path information, etc.)
Through the read/write control device 17, set the same call information area as the regular system of the standby system memory 14,
Further, an order for connecting a path corresponding to the path information is sent to the backup channel system device 16 through the order read/write control device 18.

If the call is a non-rescue call, the call information area of the standby memory 14 is initialized through the same route (setting an empty state number in the trunk memory, a monitorable state is set in the monitoring memory, etc.), and The path of the communication path system device 16 is initially set.

a read/write control device 17 that performs the above settings;
19 and order read/write control device 18, 20
An example of a specific writing method will be described below.
However, the control devices 19 and 20 operate as described above when switching from the standby system to the regular system, and their contents are exactly the same as those of the control devices 17 and 18, so only one of them will be explained below.

FIG. 2 shows an example of the configuration of the read/write control devices 17 and 19, in which the data write line 21 and the status indication line 22 are controlled by the regular processor 11. During a write operation other than call processing, only the regular system memory 13 of the state storage control circuit 28 is in the write state, and only the regular system memory 13 is accessed through the write line 27. When the regular system control processor 11 sets relief call information, it sends a two-system instruction request to the status instruction line 22, so that the status storage control circuit 28
Through control lines 25 and 26, gates 23 and 2
4 is placed in a dual-system write state, and necessary information on the data write line 21 can be set simultaneously in the regular system memory 13 and the standby system memory 14 through the write line 27 and the write line 37. Furthermore, when setting non-relief call information, by issuing an other system (protection) write instruction request to the status instruction line 22, the status storage control circuit 28 puts only the gate 24 in the writing state via the control line 26, and the write line 37, initial setting information for the data write line 21 can be set in the call information area of the standby memory 14.

FIG. 3 shows the order read/write control device 18,
20, an SP bus 51 and a control line 52 are controlled by a regular processor 11. When the regular system processor 11 sends an order for setting relief call information such as a path connection order in the communication path system, it issues a request for sending the order to both systems in response to the control line 52. The order sending switching control circuit 58 turns on the gates 53 and 54 via the order sending instruction lines 55 and 56, and simultaneously turns on the gates 53 and 54 via the SP buses 57 and 67.
The order is sent from the SP bus 51 to both communication lines.

On the other hand, when setting an initial setting order such as a path state in a non-relief call state, the processor 11 issues an order sending instruction request only for other systems (backup) through the control line 52, thereby controlling the order sending switching control circuit. 58 turns on only the gate 54 via the order sending instruction line 56 and initializes the other system (backup) communication path via the SP bus 67.

In the above control, data that changes from moment to moment during operation in the regular system, such as the number of received pulses,
Data that is not uniquely defined, such as billing work memory, is not set in the standby memory 14. Therefore, the programs and data already set in the spare memory 14 remain unchanged, and only the call information area that uniquely corresponds to the call status is changed.

The above processing is always carried out by the processor 1 for each call.
1 is on its way. Therefore, when the switching function is stopped due to a system failure, there is no need to perform call relief in the restart process by switching to the standby system control processor 12, memory 14, and standby channel system device 16 in the restart process, and the call can be interrupted. The system can be restarted without any problems.

Furthermore, even when the standby system returns from the operating state to the regular system, the system is completely symmetrical, so the system can be restarted without interruption in the same way.

As explained above, according to the present invention, in a duplex exchange, by setting relief call information in the standby system at all times, call interruptions that occur when restarting are eliminated, and system operation can be resumed.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a telephone exchange system with a fully duplex configuration to which the present invention is applied, FIG. 2 is a diagram showing an example of the configuration of the read/write control device in FIG. 1, and FIG. FIG. 2 is a diagram showing a configuration example of an order read/write control device in FIG. 11, 12... control processor, 13, 14...
...Memory, 15, 16...Communication path system device, 17,
19... Read/write control device, 18, 20...
Order read/write control device.

Claims (1)

[Claims] 1. In a restart processing method when switching systems when a switching system consisting of communication line equipment, memory, and a call control processor is duplicated, the possible states of calls are classified in advance into relief states and non-relief states, The operating system determines whether or not each call is in the above-mentioned rescue state based on the call information in its own system's memory corresponding to each call, and if the call is determined to be in the above-mentioned rescue state, it is not in operation. Call relief information and paths are set in the corresponding parts of the system's memory and communication path equipment, and for calls that are determined to be in the non-repair state, the memory and communication path of the non-operating system are set. In addition to initializing the corresponding parts of the system equipment so that they can accept new calls, when switching from the operating system to the non-operating system, the non-operating system will be configured to update its memory and communication path equipment. A restart processing method characterized in that call processing can be restarted from a preset state.