JPS5831440A - Automatic switching system for remote communication control processing device - Google Patents

Abstract

PURPOSE:To automatically switch a communication control processing device (CCP) to a spare device without dispatching an operator, by using automatic fault detecting and switching function of a switching unit incorporated in a subcenter. CONSTITUTION:If a fault is generated in a working CCP13 a signal indicating the generation of the fault is sent to a switching unit 15 through a signal line 1a. When the switching unit 15 detects the fault of the working CCP13 through the signal line 1a, a switching command is sent to switches 16, 17 through a signal line 2 and the switches 16, 17 change the connection to the CCP and terminal devices from the working CCP13 to a spare CCP14. Since the communication between a host CPU11 and the working CCP13 is interrupted, the host CCP11 actuates the spare CCP14 and starts communication again.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is designed to prevent a communication control processing device (hereinafter referred to as a CCP) installed in a subcenter located far from a center from going down due to a failure, to have a standby unit for the CCP and transfer it from the operating CCP to a standby unit. Below are the methods for automatically switching CCPK and restarting (recovering) operations.

In general, in data communication systems, in order to effectively consolidate multiple terminal devices distributed in remote locations, a method is adopted in which a communication control processing device is placed in a subcenter and connected to the data processing device at the center via a line for centralized processing.

Figure 1 is a diagram showing a conventional system. Subcenter I in the figure is an example in which a system is adopted in which after monitoring line failure, CCP switching is performed, and manual switching is performed (using an interlocking switch). Always connect the spare machine to the host (host) CPU,
This is an example in which a method is adopted in which the terminal device side is manually switched in the case of a failure in the operating CCP.

) In other words, in the event of a failure due to a subcenter IK (operating CCP3C) going down, the backup CCP4IC will be switched;
The following methods of manual switching have been adopted:
0 1) Cap located in a remote location (hereinafter referred to as remote C-)C
It is recognized by detecting Jin, who has become unable to communicate with CP3.

2) The host CPUI detects a line failure and switches to the backup line 5 (which in many cases uses a public communication line), prompts the currently operating remote CCP3 to assist again, and attempts to recover from the failure.

3) If recovery is still not possible, the operator at the center will call the operator at subcenter I (remotely).
Notify that CCP3 is out of order.

4) An operator in the sub-center ■ manually switches from the operational CCP3 to the backup CCP4 using switch 6.7, and connects the center's CPUUI and the backup CC of the sub-center I.
P4 is connected and communication is resumed.0 As mentioned above, if the CCP (conventionally remote) goes down, the method is to manually switch to the backup device (ccp)0. As in the case of subcenter I in the figure, even if the subcenter's operating CCPS and standby CCP 9 are both constantly connected to the center's CPUI via a data communication line, switching of the switch 10 between subcenter ■ and terminal 1 is not possible. This is done manually in the same way as above.

An object of the present invention is to automatically switch between the active c'cp and the standby CCPK without human intervention when the remote CCP goes down. In order to achieve this object, the present invention provides a system in which a communication control processing device that accommodates a plurality of terminal devices and mediates data transmission between a data processing device and the plurality of terminal devices is located in a remote location. , in a data communication system in which a backup communication control processing device is provided in order to avoid a system down due to a failure of the communication control processing device, a function for detecting a failure in the communication control processing device in operation and communication control during operation. A switching device is provided that has the function of switching from a processing device to a standby communication control processing device, so that when a failure occurs in the communication control processing device in operation, switching to the standby communication control processing device is automatically performed. Features.

This will be explained below with reference to the drawings. FIG. 2 is a diagram showing a switching connection system according to an embodiment of the present invention.

In the figure, host CPU II is a data processing device located in the center.
The a-cal CCP 12 is a local communication control device located at the center, the remote CCP is a communication control device located at a sub-center, and is composed of a constantly operating C CPI 3 and a standby CCP 14. T indicates a terminal device.

The operation of the embodiment is as follows: ◇ 1) When a failure occurs in the operational CCP 13, a signal indicating that the failure has occurred is notified to the switch 15 by the signal m(iα).

2) The switch operates via the signal line σ). When it detects a failure in the CCP 13, it sends a switching instruction to the switch 16 and 17 via the signal line ■. Switches 16 and 17 connect to the CCP and terminal equipment. from operational CCP1B to reserve CCP14
Switch to connection to .

3) Since the host CPU II becomes unable to communicate with the operational CCP 13, it activates the backup CCP 14 and resumes communication.

When performing unattended maintenance at a subcenter in a remote location, the failure of a remote CCP can immediately lead to extended downtime of multiple connected terminal devices. Ru. Therefore, when a failure occurs, it is necessary to repair it immediately.

According to the present invention, the automatic fault detection and switching function of the switch in the subcenter eliminates the need to recirculate personnel (CC
P can be automatically switched to standby, which is effective in minimizing downtime on the terminal device side.

[Brief explanation of drawings]

Figure 1 is a psic diagram of the conventional manual switching connection method.
FIG. 2 shows a block diagram of an embodiment of the switching connection scheme according to the invention. In FIG. 2, 11 is a data processing device, 12 companies have local communication control devices, 13 companies are operating remote communication control devices, 14 is a backup remote communication control device, 15 is a switching device of the present invention, and 16.17 is a standby remote communication control device. Showing automatic changeover switch.

Claims (1)

[Claims] A communication hub that accommodates multiple terminal devices and mediates data transfer between the data processing device and the multiple terminal devices! In a data communication system where a backup communication control processing unit is provided to avoid a system down due to a failure of the communication control processing unit when the equipment is located in a remote location, a failure of the communication control processing unit in operation is detected. By providing a switching device that has the function of switching from the communication control processing device in operation to the backup communication control processing device, when a failure occurs in the communication control processing device in use, the switching device can switch from the communication control processing device in operation to the backup communication control processing device. An automatic switching method for a remote communication control processing device characterized by automatically switching between