JPH01314030A - Equipment duplicating system - Google Patents

Abstract

PURPOSE:To improve the reliability of equipment by deciding whether or not an output changeover means corresponding to each of a common circuit section outputs a signal received from the said device based on a fault signal from the corresponding common circuit section and a fault signal from a common circuit section not corresponding thereto and a changeover control signal from an opposite changeover control means. CONSTITUTION:Each of the changeover control means 1151, 1152 decides and outputs a changeover control signal with respect to an opposed changeover control means 115 based on a changeover control signal received from an opposite changeover control means 115, a fault signal received from a corresponding common circuit section 111 and a fault signal received from a common circuit section 111 not corresponding thereto. Thus, the changeover from an active system into a standby system and the change back to the active system after the restoration of a fault of the active system is implemented normally. Thus, the changeover in duplicated constitution is made accurate and the reliability of equipment is enhanced.

Description

[Detailed Description of the Invention] [Summary] For example, regarding a device duplication system applied to complex multi-terminal terminal equipment, the purpose of this invention is to make the switching operation accurate in the duplex configuration and improve the reliability of the device. Based on two mutually equivalent common circuit sections that input the signals and the introduced control signal, it is switched whether or not to output the signal supplied from the corresponding common circuit section.
1 output switching means, and 2 outputting a switching control signal to the corresponding output switching means based on the introduced signal.
In a device duplication system comprising two switching control means,
Each of the switching control means is based on a fault signal inputted from a corresponding common circuit section, a fault signal inputted from an uncorresponding common circuit section, and a switching control signal inputted from an opposing switching control means. It is configured to determine and output a switching control signal for the corresponding output switching means.

[Industrial application field]

The present invention relates to a device duplication system, and for example, to a device duplication system applied to a complex west end station device.

(Prior Art) A known network synchronization device is composed of various types of panels each having different functions, such as a DP-PLL (digital processing PLL) and a PC (pulse generator).

By the way, this network synchronization device requires a high degree of reliability, so the panels that have these functions are usually installed two at a time, and there is also a common part that can be used to switch to the other if one breaks down. Panels were installed corresponding to the redundant sections.

In this way, devices that require a high degree of reliability, such as network synchronization equipment, have so-called active system equipment and standby system equipment, and there is no need to worry about failures in the active system. A redundant system is adopted in which the system is operated as a standby system.

FIG. 5 shows an example of application of the conventional device duplication system.

As shown in the figure, a configuration in which one switching control section 515 and one switch 517 are provided for a working circuit 511 and a standby circuit 513, which are equivalent to each other, has been common.

Here, normally, the switching control unit 515 controls the active circuit 5
A switch 517 so that the output signal of No. 11 is transmitted to the lower level.
is controlled. However, if the active circuit 511 fails, the switching control unit 515 receives the failure signal supplied from the active circuit 511 and switches the switch 517 to the standby circuit 513 side.

On the other hand, during operation by the backup system circuit 513, the backup system circuit 513
3 has failed, the switching control unit 515 receives a failure signal supplied from the backup circuit 513 if the active circuit 511 has been repaired, and switches the switch 517 to the active circuit 51.
Switch to side 1.

[Problem to be solved by the invention]

By the way, in the conventional device described above, the switching control section 5
15 does not have a redundant configuration, if the switching control unit 515 fails or its panel is removed, switching from the active system to the backup system and switching back to the active system after the failure of the active system is restored. There was a problem in that the switching operations such as the above could not be performed normally.

The present invention was created in view of the above points, and an object of the present invention is to provide a device duplication system that can make the switching operation in a duplex configuration accurate and improve the reliability of the device.

[Means to solve the problem]

FIG. 1 is a block diagram of the principle of the device duplication system according to the present invention.

In the figure, each of the common circuit units itt, , 111g receives a common signal and performs mutually equivalent processing.

Output term, alternative means 113. , 1132 switches whether or not to output the signal supplied from the corresponding common circuit section 111, based on the control signal introduced.

Each of the switching control means 1151 and 115□ receives a fault signal inputted from the corresponding common circuit section 111, a fault signal inputted from the uncorresponding common circuit section 111, and a switching control section 1151 inputted from the corresponding switching control means 115. Based on the control signal, a switching control signal for the corresponding output switching means 113 is determined and output.

Therefore, as a whole, the common circuit sections 111. ．． Output switching means 113 corresponding to the signals supplied from each of 111□
is configured to determine whether or not to output.

[For production]

Common circuit section 111. ．． 111. Each receives a common signal and performs equivalent processing.

Switching control means 115. , IIL responds to a failure signal input from the corresponding common circuit section 111, a failure signal manually input from the uncorresponding common circuit section 111, and a switching control signal input from the corresponding switching control means 115. Based on this, a switching control signal for the corresponding output switching means 113 is determined and output.

Output switching means 113. , IIL switches whether or not to output the signal supplied from the corresponding common circuit unit 111 based on a switching control signal input from the corresponding switching control means 115.

In the present invention, the common circuit section is controlled based on the failure signal from the corresponding common circuit section 111, the failure signal from the uncorresponding common circuit section 111, and the switching control signal from the opposing switching control means 115. By determining whether or not the corresponding output switching means 113 outputs the signals supplied from each of 111.0 and 111.0, the switching operation in the duplex configuration becomes accurate and the reliability of the device increases.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 2 shows the configuration of a device to which the device duplication system of the present invention is applied.

(2) Correspondence between the embodiment and the first embodiment Here, the correspondence between the embodiment of the present invention and FIG. 1 will be shown.

Common circuit section 111. ．． 111□ is clock generation circuit 2
11 and the clock generation circuit 221.

Output switching means 1131.113! is the output control circuit 21
3 and the output control circuit 223.

The switching control means 1151.115□ corresponds to the switching circuit 215 and the switching circuit 225.

The common signal corresponds to the reference clock.

Examples of the present invention will be described below assuming that the correspondence relationship as described above exists.

(2) Structure of Embodiment In FIG. 2, the device to which the device duplication system of the present invention is applied is composed of a working circuit 210 and a standby circuit 220.

The current circuit 210 includes a clock generation circuit 211 that generates various clock signals, an output control circuit 213 that controls output, and a switching circuit 215 that generates a switching control signal for the output control circuit 213.

Similarly, the preliminary circuit 220 includes a clock generation circuit 221 that generates various clock signals, an output control circuit 223 that controls output, and a switching circuit 225 that generates a switching control signal for the output control circuit 223. .

A reference clock is commonly input to clock generation circuit 211 and clock generation circuit 221.

Clock generation circuit 211 and clock generation circuit 221
Clock signals output from the output control circuit 213 and 223 are input to the output control circuit 213 and the output control circuit 223, respectively. Also,
An alarm signal output from clock generation circuit 211 is input to switching circuit 215 and switching circuit 225, and an alarm signal output from clock generation circuit 221 is input to switching circuit 215 and switching circuit 225.

The switching control signal output from the switching circuit 215 is input to the output control circuit 213 and the switching circuit 225, and the switching control signal output from the switching circuit 225 is input to the output control circuit 22.
3 and the switching circuit 215.

(2) Operation of the Embodiment FIG. 3 shows the procedure of the switching operation by the switching circuit. Fourth
The figure shows the changes in each signal.

Hereinafter, the operation in the embodiment will be explained based on FIGS. 2 to 4.

Here, the own system in FIG. 3 corresponds to the current circuit.

First, in the initial state when the power is turned on, the own system, that is, the current circuit 210 is operating.

Therefore, the switching circuit 215 in the current circuit 210 determines whether or not its own system, that is, the clock generation circuit 211, is out of order by monitoring the alarm signal from the clock generation circuit 211 (step 311).

If the own system is not in failure (negative determination in step 311), it is determined from the output signal of the switching circuit 225 in the backup circuit 220 whether or not the output in the other system, that is, the output control circuit 223, is turned off (step 312). ,
If it is in the off state (affirmative determination), the output of the own system, that is, the output control circuit 213, is kept in the on state (step 313).
. Further, if it is not in the off state (negative determination), the process moves to step 318.

On the other hand, if the clock generation circuit 211 in the own system, ie, the current circuit 210, fails and outputs an alarm signal,
Clock generation circuit 22 in other system, ie, spare circuit 220
1 is out of order (step 314)
. If other systems are also faulty (affirmative judgment), step 3
12. Proceeding to step 313, the output of the own system is kept on. On the other hand, if the other system is not faulty (negative determination at step 314), the own system, that is, the output control circuit 2
13 is turned off (step 318).

Due to the change in the output signal of the switching circuit 215, the switching circuit 225 that receives the signal outputs a control signal to turn on the output of the output control circuit 223. That is, in this state, the other system, that is, the spare circuit 220 operates.

When the other system is operating, the switching circuit 225 switches to the clock generation circuit 2.
21 (step 315).
. If the clock generation circuit 221 does not generate an alarm signal (negative determination in step 315), a switching control signal from the outside is monitored (step 316).

On the other hand, if the clock generation circuit 221 generates an alarm signal (affirmative determination in step 315), it is determined whether or not its own system, that is, the clock generation circuit 211, is generating an alarm signal (step 319).

If the clock generation circuit 211 does not generate an alarm signal (negative determination in step 319), the process moves to step 313, and the switching circuit 215 switches the output control circuit 213
Outputs a control signal to turn on the output. This causes a switch from the other system, that is, the backup circuit 220, to the own system, that is, the active circuit 210. If the clock generation circuit 211 is generating an alarm signal (affirmative determination in step 319), the process moves to step 317.

Further, in step 316, if an external control signal is input (affirmative determination), the process moves to step 319, and if an external control signal is not input (negative determination), another system, that is, the output control circuit 223 It is determined whether the output is off (step 317).

When the output of the output control circuit 223 is off (step 31
If the output of the output control circuit 223 is not off, that is, if the preliminary circuit 220 is in operation (negative determination), the process moves to step 318, and the output control circuit 213 The switching circuit 215 outputs a control signal so that the output of the switch 215 remains off.

The above series of operations results in operations as shown in FIG. 4.

That is, when both the own system and the other system are normal (initial state), a control signal is output so that the own system operates (■).

If the other system fails while the own system is in a normal state, a control signal is output so that the own system continues to operate (■).

If the own system fails while other systems fail, the control signal continues in the state of ■ (■).

If the own system fails while the other system is in a normal state, control signals are output from both systems so that the operation is switched from the own system to the other system (■).

(2) Summary of Examples In this way, each of the clock generation circuit 211 and the clock generation circuit 221 is connected to the switching circuit 215, the output control circuit 213, and the switching circuit 225.
has.

At this time, the switching circuit 215
and an alarm signal from the clock generation circuit 221,
The switching circuit 225 determines and outputs a switching control signal to the output control circuit 213 based on the switching control signal from the switching circuit 225, and the switching circuit 225 receives the alarm signal from the clock generation circuit 211 and the clock generation circuit 221, and the switching circuit Based on the switching control signal from 215, the switching control signal for the output control circuit 223 is determined.

As a result, when the working circuit 210 is out of order, the operation is switched to the standby circuit 220 if the standby circuit 220 is not out of order; The operation changes.

Therefore, the switching operation in the duplex configuration becomes accurate and the reliability of the device increases. In addition, in the conventional example, the switching control section is
Although it was provided as a panel, this embodiment does not have this panel, so reliability is increased and the mounting efficiency of the entire device is improved.

(2) Modifications of the invention In the above-described embodiments of the invention, a clock generation circuit is used as the common circuit section, but the invention is not limited to this.

In addition, in ``correspondence between Examples and Figure 1'',
Although the correspondence between the present invention and the embodiments has been explained, the present invention is not limited thereto (although those skilled in the art can easily imagine that there are various modifications).

[Effects of the Invention] As described above, according to the present invention, a fault signal from a corresponding common circuit section, a fault signal from an uncorresponding common circuit section, and a switching control signal from the opposing switching control means By determining whether or not the corresponding output switching means outputs the signal input from each common circuit section based on the above, the switching operation in the duplex configuration becomes accurate and the reliability of the device increases. It is extremely useful.

[Brief explanation of the drawing]

Fig. 1 is a principle block diagram of the device duplication system of the present invention, Fig. 2 is a configuration block diagram of an embodiment adopting the device duplication system of the present invention, Fig. 3 is an explanatory diagram of switching operation by a switching circuit, FIG. 4 is an explanatory diagram of each signal, and FIG. 5 is a configuration block diagram of a conventional example. In the figure, 111 is a common circuit section, 113 is an output switching means, 115 is a switching control means, 210 is a current circuit, 220 is a backup circuit, 211.221 is a clock generation circuit, 213.223 is an output control circuit, 215.225 511 is a switching circuit, 511 is a working circuit, 5.13 is a standby circuit, 515 is a switching control unit, and 517 is a switching device. This invention. 7 degrees mouth, country 1, Xuan Shi now J's 4 pro 1 prisoner

Claims (1)

[Claims] (1) Input common signals and perform equivalent processing 2
Based on the two common circuit units (111_1, 111_2) and the control signal introduced, the corresponding common circuit unit (111_2)
Two output switching means (113_1, 111_2) for switching whether or not to output the signals supplied from the
, 113_2) and two switching control means (113_2) that output a switching control signal to the corresponding output switching means (113_1, 113_2) based on the introduced signal.
5_1, 115_2), and in the device duplication system comprising: (111) and the corresponding switching control means (
Based on the switching control signal input from 115),
A device duplication system characterized in that a control signal for switching to the corresponding output switching means (113) is determined and output.