JPH03258032A - Alarm raising protection circuit at redundancy changeover - Google Patents

Abstract

PURPOSE:To suppress generation of undesired secondary alarm by generating a protection pulse suppressing the generation of the secondary alarm caused attended with the redundancy changeover in the generating timing of the redundancy changeover. CONSTITUTION:System information of a circuit having a redundancy system is inputted to a changeover detector 11 and a changeover detection pulse detecting a switching timing of redundancy constitution section is outputted. Then the redundancy detection pulse is inputted to a protection pulse generator 12, from which a protection pulse suppressing the generation of alarm is outputted. Then alarm information being an object of protection and the protection pulse are inputted to a protection circuit 13 and the raising of the alarm is suppressed when the protection pulse exists. Thus, generation of undesired secondary alarm is suppressed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an alarm generation protection circuit during redundant switching, and particularly in the field of digital communication having a redundant system, it is possible to prevent unwanted secondary alarms by switching redundant elements. The present invention relates to an alarm generation protection circuit during redundancy switching that suppresses alarm generation.

[Conventional technology]

Conventionally, when redundancy switching occurs in a circuit with this type of redundant configuration, an unnecessary secondary alarm is generated, but no circuit configuration is provided to suppress the issuance of this secondary alarm. is common.

[Problem to be solved by the invention]

The above-described conventional circuit having a redundant system does not have a circuit that protects the issuance of a secondary alarm at the time of redundancy switching, and therefore has the disadvantage of issuing an unnecessary secondary alarm.

[Means to solve the problem]

The alarm generation protection circuit at the time of redundancy switching of the present invention inputs system information of a circuit having a redundant component, and when redundancy switching occurs in the redundant component and the system information changes, it detects this and generates a switching detection pulse. a protection pulse generator that receives the switching detection pulse and generates a protection pulse that suppresses the generation of alarm information that is output from the circuit having the redundant component when redundancy switching occurs; , and a protection circuit that receives the protection pulse and suppresses the issuance of the alarm information at the time of redundancy switching.

Further, the alarm generation protection circuit at the time of redundancy switching according to the present invention has a configuration in which the pulse width of the protection pulse is made larger than the generation time of the alarm information to suppress generation of the alarm information at the time of redundancy switching.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, which includes a switching detector 11 that receives system information and detects redundant switching in a redundant component (not shown), and a switching detector 11 that detects redundant switching in a redundant component (not shown). It comprises a protection pulse generator 12 that outputs protection pulses at timing, and a protection circuit 12 that uses the protection pulses to suppress generation of alarm information at the time of redundancy switching.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

System information of a circuit having a redundant system is input to the switching detector 11, which outputs a switching detection pulse that detects the switching timing of the redundant component. Next, the switching detection pulse is input to the protection pulse generator 12, which outputs a protection pulse that suppresses alarm generation.Next, the alarm information to be protected and the protection pulse are input to the protection circuit 13, and the protection pulse is input to the protection circuit 13. When the pulse is on, the alarm is suppressed.

FIG. 2 is a timing chart for explaining the operation of the embodiment shown in FIG. FIG. 2(a) shows a state in which the system information of the redundant component consisting of the 0 system and 1 system is redundantly switched from the O system to the 1 system.
The alarm information shown in b) is output. This alarm information is simply generated due to redundancy switching and is unnecessary information. The switching detector 11 receives system information including redundant switching and generates a switching detection pulse at the timing of redundant switching. When the protection pulse generator 12 receives this switching detection pulse, it generates the protection pulse shown in FIG. 2(C) with a longer pulse width than the alarm information of the known pulse width shown in FIG. 2(b), This is supplied to the protection circuit 13. The protection circuit 13 is
During the protection pulse generation period, alarm information is generated as shown in Figure 2 (d).
The occurrence of undesired secondary alarm information is thus suppressed.

〔Effect of the invention〕

As explained above, the present invention is capable of generating, at the timing of redundancy switching, a protection pulse that suppresses the issuance of a secondary alarm that occurs due to redundancy switching in a device having a redundant circuit configuration. This has the effect of fundamentally suppressing the issuance of unnecessary secondary alarms.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a timing chart for explaining the operation of the embodiment of FIG. 11... Switching detector, 12... Protection pulse generator,
13...Protection circuit.

Claims (1)

[Claims] 1. Switching detection that inputs system information of a circuit having a redundant component, detects when redundancy switching occurs in the redundant component and changes system information, and generates a switching detection pulse. a protection pulse generator that receives the switching detection pulse and generates a protection pulse that suppresses the generation of alarm information that is output from the circuit having the redundant component in response to the occurrence of redundant switching;
A protection circuit for generating an alarm at the time of redundancy switching, comprising: a protection circuit that receives the protection pulse and suppresses the generation of the alarm information at the time of redundancy switching. 2. The alarm generation protection circuit at the time of redundancy switching according to claim 1, wherein the pulse width of the protection pulse is made larger than the generation time of the alarm information to suppress generation of the alarm information at the time of redundancy switching.