JPH03101553A - Duplicate switching method of hot standby system - Google Patents

Abstract

PURPOSE:To attain changeover with high system stability by implementing duplicate changeover not only in the case of a fault of an opposite equipment but also in the case of detection of a line fault. CONSTITUTION:A 2nd input output communication controller 2 of slave system operation is provided with a system changeover request reception means from an electronic exchange 3 and a stop instruction relay means to a main system equipment 1 and a 1st input output communication controller 1 of main system operation is provided with a stop instruction reception means from the slave system equipment 2 and a stop means of the main system equipment 1 and when a data communication line 5 between the 1st input output communication controller 1 of the main system operation and the electronic exchange 3 is faulty, the 2nd input output communication controller 2 of the slave system operation receives a system switching request from the electronic exchange 3 through the data communication line 6 and sends a stop instruction to the 1st input output communication controller 1 and the 2nd input output communication controller 2 applies data communication with the electronic exchange 3 as the main system through the data communication line 6.

Description

[Detailed Description of the Invention] [Summary] Regarding a redundant switching method for a hot standby type input/output communication control device, when a data line between the input/output communication control device and an electronic exchange becomes a failure, automatic switching is performed. In an input/output control device that controls communication between an electronic exchange duplexed into a main system and a slave system and a host computer, the purpose of switching to another input/output communication control device is to switch to another input/output communication control device in the secondary system operation. The communication control device is provided with a means for accepting a system switching request from an electronic exchange and a means for relaying a stop command to the main system device, and the first input/output communication control device for main operation is provided with a means for accepting a system switching request from the electronic exchange and a means for relaying a stop command from the slave device. If there is a failure in the data communication path between the first input/output communication control device in main operation and the electronic exchange, the second input/output communication control device in slave operation is provided with means for stopping the main system device. Receives a system switching request from the electronic exchange, sends a stop command to the first input/output communication control device in main system operation via a communication path, and stops the first input/output communication control device in main system operation. The second input/output communication control device operating in the slave system is configured to perform data communication with the electronic exchange through the data communication path as the main system.

[Industrial application field]

The present invention relates to (1) a redundancy switching method for a hot standby type input/output communication control device;

Hot standby type input/output communication control devices are used as connection interfaces between electronic exchanges and host computers in firefighting systems. Figure 3 shows an example of the system configuration of a firefighting system. In the figure, 11 and 12 are hot standby type input/output communication control devices #0 and #1, 13 is an electronic exchange, 14 is a host computer, 15 is an information display panel, 16 is a command console group, 17 is a telephone office group, 18 indicates a firefighting center system.

The telephone station group 17 houses a group of subscriber telephones and a group of fire stations under its jurisdiction, and the fire center system 18 includes a command desk group 16 that receives and processes fire information, and an information display that centrally displays fire information. It is equipped with a panel 15 and a host computer 14 that centrally processes these devices, and relays the fire information in the area received by the electronic exchange 13 to the command console group 16, and also relays it to the host computer 14 via the input/output communication control device 11 or 12. and the information display panel 15. The command console group 16 is also connected to the host computer 13, and inputs reception information from subscribers and command information to the fire department to the information display panel 15 via an input/output communication control device.

In the above system, input/output communication control devices 11 and 12
It is a hot standby system, in which the main system constantly sends the latest information to the slave system via a communication line so that the system can be immediately switched to the slave system in the event of a failure in the main system.

[Prior Art] FIG. 4 shows a conventional redundancy switching method for a hot standby type input/output communication control device. The figure shows the connecting portion between the electronic exchange and the input/output communication control device, and other connecting devices are omitted.

In the figure, 21 is an input/output communication control device #0.22 is an input/output communication control device #1.23 is an electronic exchange, 24 is a communication path between input/output communication control devices #0 and #1, and 25 is an input/output communication control device. Communication path between output communication control device #0 and electronic exchange, 26
indicates a communication path between the input/output communication control device #1 and the electronic exchange.

This system is a relay device that connects the electronic exchange and other equipment, and has a redundant hot standby configuration, with one #0 device operating as the main system (carrying out data communication with the electronic exchange). The #1 device is in slave (standby) operation. Each device has data lines 25 and 26 between it and the electronic exchange, but data communication is normally performed through the communication path 25 with device #0 which is in main operation. The communication path 24 between the #0 device of the main system and the #1 device of the slave system allows the #0 device of the main system to
The settings are such that the latest information is constantly sent from the #0 device to the #1 slave device, and in the event of a failure in the master device, it can be immediately switched to the slave #1 device.

[Problem to be solved by the invention]

In the conventional hot standby type redundancy switching method, in the event of a failure in the main system, it is possible to immediately switch to the standby slave system, but the communication path between the main system and the electronic exchange may fail. In this case, failure information on the communication path of the main device is not transmitted to the slave device, and switching to the slave device is not performed until the failure in the communication path is discovered by maintenance personnel, and data communication is interrupted during that time. The problem was that it wouldn't work.

In the present invention, communication between the main system and the slave system is performed as before, and if the main system's own equipment malfunctions, redundancy is immediately switched to the slave system, and the data communication line of the main system is interrupted. The purpose of this system is to enable duplex switching to be performed immediately on a slave device in response to a switching request from the electronic exchange to the device performing slave operation.

[Means for Solving the Problems] FIG. 1 shows a basic configuration diagram of the hot standby type duplex switching method of the present invention. In the figure, 1 is the first input/output communication control device of the main system, 2 is the second input/output communication control device of the slave system, 3 is an electronic exchange, and 4 is communication between the main system device and the slave system. 5 is a communication path between the main device and the electronic exchange, and 6 is a communication path between the slave device and the electronic exchange.

In a hot standby type input/output communication control device that connects an electronic exchange, a host computer, and an information display panel, the electronic exchange 3 is connected to the second input/output communication control device 2 in slave operation.
The first input/output communication control device l for main system operation is provided with means for accepting a system switching request from the main system device 1 and a means for relaying a stop command to the main system device 1.
A means for receiving a stop command from the slave device 2 and a means for stopping the main device 1 are provided, and the first input/output communication control device 1 for main operation is provided.
If there is a failure in the data communication path 5 between the and the electronic exchange 3,
The second input/output communication control device 2 in slave system operation receives a system switching request from the electronic exchange 3 through the data communication path 6, and sends the request to the first input/output communication control device l in main system operation through the data communication path 4. sends a stop command to stop the first input/output communication control device 1 in main operation, and at the same time, the second input/output communication control device 2 in slave operation is connected to the electronic exchange 3 via the data communication path 6 as the main system. Configure it to perform data communication with.

[Effect]

The duplex switching method will be explained with reference to the flowchart in FIG. 2 of the present invention.

■ First input/output communication control device 1 performing main system operation
Data communication is carried out between the electronic exchange 3 and the data communication path 5.

(2) The latest information (2) is sent from the first input/output communication control device engineer in main operation to the second input/output communication control device 2 in standby mode via the data communication path 4.

(2) If a failure occurs in the data communication path 5 between the first input/output communication control device 1 and the electronic exchange 3, the electronic exchange 3 recognizes the failure in the communication path 5 because the message does not arrive.

(2) A system switching request is made from the electronic exchange 3 to the second input/output communication control device 2 which is performing slave operation through the data communication path 6.

■ The second input/output communication control device 2 receives a system switching request from the electronic exchange 3 using the system switching request receiving means, and sends the system switching request to the first input/output communication control device 1 via the data communication path 4 using the stop command relaying means. Relay the stop command.

(2) The first input/output communication control device 1 receives a stop command by the stop command receiving means, and stops the operation of the first input/output communication control device 1 by the stop means.

(2) The second input/output communication control device 2 starts operating as the main system, and data communication becomes possible through the electronic exchange 3 and the data communication path 5.

〔Example〕

An embodiment of the present invention will be described using an example of the configuration of a firefighting system shown in FIG. In the figure, 11 and 12 are hot standby type input/output communication control devices #0 and #1.13 is an electronic exchange;
4 is a host computer, 15 is an information display panel, 16 is a command console group, 17 is a telephone office group, and 18 is a firefighting center system.

The interface functions of the input/output communication control devices #O and #l are as follows.

(1) Conversion of messages between the electronic exchange 13 and the host computer 14 is performed.

(2) Conversion of messages between the electronic exchange 13 and the information display panel 15 is performed.

(3) Firefighting information from the electronic exchange 13 and host computer 14 is relayed and displayed on the information display panel 15.

(4) The latest information of the electronic exchange 13 is transmitted from the main system device 11 to the slave system device 12.

The contents of the message sent from the electronic exchange @ 13 to the input/output communication control device 11 include fire information reception time, reception order number, functional information such as disconnection pending, telephone line code, etc., and each message starts from about 50 bytes. These messages are successively sent to the information display panel 15 and the host computer 14 for each reception. The information display panel 15 relays and displays telegrams from the electronic exchange 13 and command board information from the host computer 14, and centrally displays the fire situation in the area on an electronic map screen.

In the above system, if the main device 11 has a failure, switching information is sent to the standby slave device 12.
2 performs data communication as the main system device.

Since the latest message information is sent from the main system device 11, duplex switching is possible.

In addition, if there is a failure in the data communication path from the electronic exchange 13 to the master device 11, the electronic exchange 13 recognizes that the message cannot reach the master device 11 and sends a system switch request to the slave device 12. send, stop the main device 11, and send it to the slave device 12.
, data communication can be performed using the slave device 12 as the main system.

In the above operation, the slave device 12 becomes the main system, and the main system device 1
Even if the first data communication path is restored and the device becomes a standby device, it is possible to similarly monitor the line status on the main device side and perform standby.

〔Effect of the invention〕

By performing duplex switching not only when a failure occurs in the other device, but also when a line failure is detected, it is possible to perform switching with higher system safety.

[Brief explanation of drawings]

Fig. 1 is a principle configuration diagram of the present invention, Fig. 2 is a flowchart of the present invention, Fig. 3 is a side view of the system configuration of the firefighting system,
FIG. 4 shows a connection configuration diagram of a conventional example. In the figure, 1.11.21. 2.12.22 is a hot standby type input/output communication control device, 3,13゜2
3 is an electronic exchange; 4. 5. 6.24.25.26 are data communication channels, 14 is a host computer, 15 is an information display panel, 16 is a command center group, 17 is a telephone station group, and 18 is a firefighting center system. Indicates the order of operation. Principle configuration diagram of the present invention Figure 1 Flowchart of the present invention Figure 2

Claims (1)

[Scope of Claims] In an input/output control device that controls communication between an electronic exchange duplexed into a main system and a slave system and a host computer, the second input/output communication control device (2) in slave system operation includes an electronic exchange. (3) A means for accepting a system switching request from the slave device and a means for relaying a stop command to the main system device are provided. If there is a failure in the data communication path (5) between the first input/output communication control device (1) of the main system operation and the electronic exchange (3), the system is equipped with means for stopping the main system operation. The second input/output communication control device (2) receives a system switching request from the electronic exchange (3), and stops the first input/output communication control device (1) in main operation via the communication path (4). The command is sent to stop the first input/output communication control device (1) in the main operation, and the second input/output communication control device (2) in the slave operation starts the data communication path (6) as the main system. A hot standby type duplex switching method characterized by performing data communication with an electronic exchange (3).