JPH028507B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field of the Invention The present invention relates to an external monitoring device for an electronic switching system, and in particular, it continuously transmits emergency activation of system switching to an electronic switching system, and monitors the electronic switching system. This relates to an external monitoring method that takes into consideration not to interfere with the start-up operation.

(b) Problems with the Prior Art An external monitoring device for an electronic switching system is a device that checks the normality of the switching system by periodically issuing calls from outside and monitoring the responses. External monitoring equipment is typically provided with a plurality of external monitoring units, each operating independently to periodically place calls to the switching system and receive response signals from the central processing unit of the electronic switching system. If this response signal is normal, it is determined that the switching system is operating normally, and if this response signal is abnormal, it normally issues another call, and if the response signal is abnormal again [ [In some cases, this may be repeated several times] It is determined that an abnormality has occurred in the exchange system, and an emergency activation request signal is sent to this exchange system. The normal switching system employs a duplex system with a regular system and a backup system, and upon receiving this emergency activation request signal, switches from the regular system to the backup system. The switched backup system is immediately reset and initialized, but it takes some time for this to be completed. This time is called the rising time.

Now, if the replacement system is switched from the regular system to the standby system due to an emergency start request signal from an external monitoring unit, and an emergency start request signal is issued from another external monitor while the standby system is starting up, the abnormality will occur again. This has the disadvantage that the system will be confused because it will switch to the regular system.

(c) Purpose of the Invention The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to provide a plurality of external monitoring units with the function of mutually monitoring their operations, so that other external monitoring units can be activated in an emergency. It is possible to determine whether or not a request signal has been transmitted, and to transmit its own emergency activation request signal after system switching of the exchange system is surely completed.

(d) Structure of the Invention According to the present invention, the above-mentioned object is to monitor the normality of the switching system by each independently issuing a call to the switching system at a constant period and receiving a response signal from the switching system. In an external monitoring device including two external monitoring units, a memory circuit stores information that the external monitoring unit has transmitted an emergency activation request signal to the exchange system, and the storage circuit transmits the emergency activation request signal. By incorporating a timer circuit in the external monitoring unit that starts at the same time as it is memorized, the external monitoring unit does not operate the other external monitoring unit within a predetermined period of time after the switching system is switched from the regular system to the standby system in response to the emergency activation request signal. This is achieved by providing an external monitoring method characterized by stopping the unit from transmitting an emergency activation request signal.

(e) Embodiment of the Invention FIG. 1 is a diagram showing an embodiment of an external monitoring device according to the present invention. In the diagram, ESC#1, ESC#2~
ESC#N is the external monitoring section, INTERFACE is the interface section, and CPU is the central processing unit of the electronic exchange.

FIG. 2 is a diagram illustrating the configuration of the external monitoring unit ESC.

In the figure, MPU is a microprocessor, ROM
is read-only memory, RAM is random access memory, ADAP is peripheral interface adapter, and TIMER is programmable timer.

FIG. 3 is a flow chart for explaining the operation of the external monitoring unit ESC.

Same as the conventional method, multiple external monitoring units ESC#1
~ESC#N has an independent interface section
A call is periodically made via INTERFACE to the central processing unit CPU of the electronic exchange, which executes and manages exchange connection control of the exchange system, and its normality is monitored.

As shown in FIG. 2, each external monitoring unit ESC according to the present invention is a peripheral unit that exchanges signals with other external monitoring units ESC and the central processing unit CPU of the electronic exchange via an interface unit INTERFACE.
Random access memory that stores emergency activation request signals sent from the interface adapter ADAP and each external monitoring device ESC#1 to ESC#N
RAM, a programmable timer that monitors the time interval after the emergency start request signal is issued.
It contains a microprocessor MPU that controls the TIMER, etc., and a read-only memory ROM that stores the operating program of the microprocessor MPU.

The details of the present invention will be explained below with reference to the drawings. As explained in the section on the prior art, each external monitoring section periodically issues a call, receives a response from the central processing unit, and when it receives an abnormal signal n times in succession, it performs emergency activation monitoring as shown in FIG. Operate according to routine.

That is, its own random access memory RAM
Check the contents of the programmable timer TIMER to check whether an emergency start request signal has already been sent from another external monitoring section. and suppress the transmission of emergency activation request signals for a certain period of time. Further, if an emergency activation request signal is not transmitted from another external monitoring section, an emergency activation request signal is transmitted.

(f) Effects of the Invention According to the present invention, as explained in detail above, the next emergency activation request signal is transmitted after confirming that system switching of the switching system has been reliably completed by the emergency activation request signal. This has the great effect of preventing system confusion.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of an external monitoring device according to the present invention. FIG. 2 is a diagram illustrating the configuration of the external monitoring unit ESC. Figure 3 shows the external monitoring unit ESC
This is a flow chart for explaining the operation. In the figure, ESC#1, ESC#2 to ESC#N are external monitoring units, INTERFACE is interface unit, and CPU
is the central processing unit of an electronic switchboard, MPU is a microprocessor, ROM is read-only memory, RAM is random access memory,
ADAP is a peripheral interface adapter and TIMER is a programmable timer.

Claims (1)

[Claims] 1. In an external monitoring device consisting of a plurality of external monitoring units, each of which independently issues a call to a switching system at a fixed period, receives a response signal from the switching system, and monitors the normality of the switching system. , the external monitoring unit includes a storage circuit for storing that the external monitoring unit has sent an emergency activation request signal to the exchange system, and a timer circuit that starts at the same time as the storage circuit stores the emergency activation request signal. By this, the other external monitoring units are prevented from transmitting the emergency activation request signal within a predetermined time after the switching system is switched from the regular system to the standby system by the emergency activation request signal. Features external monitoring method.