JPH04271524A - Active standby switching signal generating circuit - Google Patents

Abstract

PURPOSE:To miniaturize a circuit without the need of extension of the circuit even when number of packages is increased by outputting an active standby switching signal from an ON SET signal output section as a serial and delivering the signal to each package through a serial bus. CONSTITUTION:A main signal circuit 8 is monitored by a monitoring circuit 6 and when the circuit 6 detectes a fault, a signal is sent to an ON SET signal section 4. The output section 4 collects fault signals from packages 1-N and analyzes them to output a serial ON SET signal instructing the new ON LINE state of each package. This signal is delivered to its own package ON SET signal detection section 5 of each of the package 1-N to detect and output the ON SET signal of its package. The output signal is sent to a switching circuit 7 to switch its own package to any of the active and standby states. The package of a redundant system not outputting a fault signal is not switched.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a working standby switching signal generation circuit, and more particularly to a circuit for generating a working standby switching signal.
The present invention relates to a working/standby switching signal generation circuit that generates a working/standby switching signal to each package in a redundant configuration such as a package.

0002

[Prior Art] In general, the elements that make up a redundant system are active and backup packages, devices, transmission lines, etc. to be switched, a fault detection circuit that monitors these and detects faults, and switches based on the fault signal. They are a working/standby switching signal generation circuit that determines the target and outputs a working/standby switching signal, and a switching circuit that receives this switching signal and switches the package, etc. between working/standby. The object of the present invention is a working/standby switching signal generation circuit, which becomes a complicated circuit if there are many switching target circuits or if there are many switching conditions such as N:1.

Conventionally, this type of active/standby switching signal generation circuit was provided for each set of packages with a redundant configuration, and
The working/standby switching signal to the
At the same time, switching timing signals were sent to all packages via the serial bus.

0004

[Problem to be solved by the invention] As explained above,
In the conventional example, a working/standby switching signal generation circuit was provided for each set of redundant configuration packages and the switching signal was sent via a parallel bus, so as the number of redundant configuration packages increased, the number of parallel buses also increased and the number of circuits increased. There was a problem that the number of devices increased, the size of the device increased, and the cost also increased.

[0005]

[Means for Solving the Problems] A working/standby switching signal generating circuit according to the present invention receives failure information from each package of a plurality of sets of packages in a redundant relationship, and selects either the working or standby of each of the packages. an ON SET signal output section that outputs a serial ON SET signal indicating the ONLINE state of the SET; a serial bus that delivers the ON SET signal to each of the packages; and a detection section that detects a self-package ON SET signal from the obtained ON SET signal and outputs it as its own working/standby switching signal.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of the redundant system of this embodiment. The working/standby switching signal generation circuit of the present invention is ONSET.
Signal output section 4, serial bus 3, self package ON
It is composed of a SET signal detection section 5.

The main signal circuit 8 of each package 1 to N is monitored by a monitoring circuit 6, and when the monitoring circuit 6 detects a fault, it sends a fault signal to the ON SET signal output section 4. The ON SET signal output section 4 outputs each package.
Collect fault signals from Ji 1 to N and analyze this information.
Outputs a serial ON SET signal indicating the ON LINE status of each new package. This signal is delivered via the serial bus 3 to the self-package ON SET signal detection section 5 of each package 1 to N. The self-package ON SET signal detection section 5 detects the self-package ON SET signal from this signal and outputs it. This output signal is sent to the switching circuit 7 to switch the self-package to either the active or standby state. However, redundant packages that do not output fault signals do not perform switching operations.

Next, details of the operation of the self-package ON SET signal detection section 5 will be explained. FIG. 2 is a block diagram showing the circuit configuration of this embodiment. Each package 1~N
If there is no change in the ONLINE state of
The T signal output section 1 outputs a LOW level signal. Due to the occurrence of a fault signal, etc., this ON LINE
When changing the state, a pulse pattern (in this case, the number of continuous pulses) indicating a new ON LINE state is output, and is input to the self-package ON SET signal detection section 5 of each package via the serial bus 3. Ru.

Here, the input pulse is first input to the counter 51 and the signal disconnection detection section 54. When the counter 51 starts counting input pulses, its output lines 51-1 to N
A bit pattern is sequentially set and input to the latch circuit 52. When the input pulse disappears, the signal disconnection detection unit 5
4 is activated, a reset pulse is output to the counter 51, and the counter is reset.

The bit patterns of the counter output lines 51-1 to 51-N at this time are latched by the latch circuit 52. This bit pattern becomes information indicating the new ON LINE state. This bit pattern is input to the next selector 53, and is detected by the signal from the mounting position detection circuit 55.
The self-package bit is selected. This selected signal is output as the ON SET signal 513 of the self-package.

FIG. 3 is a time chart showing the signal conversion process of the embodiment described above. In this figure, the package is 4.
In this figure, A is the output line of the ON SET signal output section 4, that is, the serial bus 3, B is the output line of the counter circuit 51, C is the output line of the latch circuit 52, and D is the output line of the selector 53. Each pulse waveform on the output line is shown. In this example, the output signal of selector 53 is
Packages 1 and 3 are ON SET (active) and packages 2 and 4 are OFF SET (spare).

[0012] In the embodiment described above, the switching method is N:
Although this is a simple example of E=1:1, the characteristics of the present invention are brought out when applied to a complex switching system such as N:1. Furthermore, the present invention can be applied even if there are structural differences such as the switching circuit being located outside the package, or even if the switching target is a device, transmission line, etc. other than the package.

[0013]

[Effects of the Invention] As explained above, the present invention outputs the ON SET signal of each package, that is, the working/standby switching signal as a serial signal from the ON SET signal output section, and sends it to each package via the serial bus. Since it is delivered, there is no need to increase the number of circuits even if the number of packages increases, which is effective in downsizing the device and reducing costs.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall configuration of a redundant system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a circuit configuration of an embodiment of the present invention.

FIG. 3 is a time chart showing a signal conversion process according to an embodiment of the present invention.

[Explanation of symbols]

1, 2, N-1, N Package 3 Serial bus 4 ON SET signal output section 5 Self-package ON SET signal detection section 5
1 Counter 52 Latch circuit 53 Selector 54 Signal disconnection detection circuit 25 Mounting position detection circuit

Claims (1)

[Claims] Claim 1: Receives fault information from each package of a plurality of sets of packages in a redundant relationship, and outputs a serial ON SET signal indicating the ON LINE status of each package, either active or spare. an ON SET signal output section, a serial bus for delivering the ON SET signal to each package, and a self-package ON SET signal from the ON SET signal obtained in each package via the serial bus; What is claimed is: 1. A working/standby switching signal generation circuit comprising: a detecting section that detects and outputs the current/standby switching signal as its own working/standby switching signal.