JPH07307770A - Protection control circuit - Google Patents

Abstract

PURPOSE:To simplify and facilitate the changeover control by a changeover control part and to shorten time required for changeover. CONSTITUTION:The changeover control part 5 monitors active units 1-1 and 1-2 and outputs changeover information to a reserve unit 2 when the fault of the active units 1-1 and 1-2 is detected. The reserve unit 2 generates a changeover instruction based on the changeover information from the changeover control part 5 and respectively outputs it to a line wire side changeover unit 3 and a device side changeover part 4. The cue line wire side changeover unit 3 switches the active units 1-1 and 1-2 and the reserve unit 2 corresponding to the changeover instruction and the device side changeover part 4 switches the active units 1-1 and 1-2 and the reserve unit 2 corresponding to the changeover instruction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protection control circuit, and more particularly to a protection control system of a 1: N redundant system composed of a plurality of working units and one spare unit.

[0002]

2. Description of the Related Art Conventionally, in a 1: N protection control system, as shown in FIG.
i (i = 1, 2, ...) And one spare unit 6,
Switching control is performed between the active unit 1-i and the standby unit 6 in the system including the outside line side switching unit 3, the device side switching unit 4, and the switching control unit 7.

The switching control unit 7 is a switching control bus 13
0 to the active unit 1-i, the standby unit 6, the outside line side switching unit 3, and the device side switching unit 4, respectively.

The active unit 1-i and the standby unit 6 respectively perform various processes such as format conversion on the signals input through the external line 10i such as a telephone line, and the processed signals are transmitted through the line 11i. Send to the device.

Here, for example, when a failure occurs in the active unit 1-1, the switching control unit 7 causes the switching control bus 130 to operate.
The failure of the working unit 1-1 is detected via the. When the switching control unit 7 detects a failure in the working unit 1-1, the switching control bus 130 switches between the working unit 1-1, the standby unit 6, the outside line side switching unit 3, and the device side switching unit 4, respectively. Control the active unit 1-
1 is switched to the spare unit 6.

[0006]

SUMMARY OF THE INVENTION The conventional 1: N described above.
In the protection control system, if a failure occurs in any of the multiple active units, the switching control unit switches the active unit, the standby unit, the external line switching unit, and the device switching unit via the switching control bus. Therefore, there are many control targets of the switching control unit.

As a result, the switching control processing by the switching control section becomes complicated and the processing time required for switching between the working unit in which a failure has occurred and the spare unit becomes long.

Therefore, an object of the present invention is to provide a protection control circuit which can solve the above problems, simplify the switching control processing by the switching control unit, and shorten the processing time required for switching. To do.

[0009]

A protection control circuit according to the present invention comprises a plurality of working units and a spare unit, an external line provided corresponding to the plurality of working units, a plurality of the working units and the spare unit. An external line side switching circuit for connecting the plurality of working units, a device side switching circuit for connecting the plurality of working units and the spare unit to the lines in the device provided corresponding to the plurality of working units, A protection control circuit that controls the outside line side switching circuit and the device side switching circuit when one of a plurality of active units fails to switch between the failed active unit and the standby unit. Therefore, at the time of occurrence of the failure, switching information for switching between the working unit in which the failure has occurred and the standby unit is generated. Generation means for, and means for outputting a switching instruction to the circuit each switching the external side switching circuit and the device side based on the switching information generated by and said generating means is provided in the spare unit.

Another protection control circuit of the present invention is
In addition to the above-mentioned configuration, when the occurrence of the failure, a determination means for determining whether or not it is possible to switch between the working unit and the standby unit in which the failure has occurred, and the determination means is a combination of the active unit and the backup unit. And means for outputting failure information to the host device when it is determined that switching is not possible.

Another protection control circuit of the present invention is
In addition to the above configuration, a monitoring unit that monitors whether or not the failed working unit has been restored, and the working unit fails when the monitoring unit detects the restoration of the failed working unit. Creating means for creating connection information for connecting respectively to the previously connected external line and the line in the device, and the external line side switching based on the connection information provided in the spare unit and created by the creating means And a means for outputting a switching instruction to each of the circuit and the device side switching circuit.

[0012]

The switching control unit monitors the occurrence of a failure in the working unit, and outputs the switching information to the standby unit when a failure occurs in the working unit. The switching instruction generated by the standby unit based on this switching information is sent to the outside line side switching unit and the device side switching unit 4.

As a result, when switching between the working unit and the spare unit, the control target of the switching control unit 5 is limited to the one working unit and the spare unit in which a failure has occurred, so that the control of the switching process is simple. The processing time required for the switching can be shortened.

[0014]

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In the figure, a 1: N protection control circuit according to an embodiment of the present invention comprises a plurality of active units 1-i (i = 1, 2, ...) And a spare unit 2.
An outside line side switching unit 3, a device side switching unit 4,
It is composed of a switching control unit 5.

The switching control unit 5 is a switching control bus 10.
0 to the active unit 1-i and the spare unit 2 respectively, and the spare unit 2 is connected to the switching control lines 121, 1
The external line side switching unit 3 and the device side switching unit 4 are connected via 22 respectively.

The outside line side switching unit 3 has a switching control line 1
The connection between the external line 10i, the working unit 1-i and the spare unit 2 is switched in response to a switching instruction from the spare unit 2 input via 21.

Further, the device side switching unit 4 uses the switching control line 1
The connection between the working unit 1-i and the spare unit 2 and the line 11i in the apparatus is switched in response to a switching instruction from the spare unit 2 input via 22.

For example, when a failure occurs in the active unit 1-1 and the active unit 1-1 is switched to the spare unit 2, the switching controller 5 uses the switching control bus 100 to switch the active unit 1-1 and the spare unit 2 to each other. Switching control is performed for and.

At this time, the spare unit 2 responds to the switching control of the switching control unit 5 and responds to the switching control lines 121 and 122.
A switching instruction is output to each of the outside line side switching unit 3 and the device side switching unit 4 via.

Here, the active unit 1-1 is connected to the outside line 101 via the outside line side switching unit 3 and the device side switching unit 4.
And the line 111, respectively, the outside line side switching unit 3 changes the connection between the outside line 101 and the working unit 1-1 to the connection between the outside line 101 and the standby unit 2 in response to the switching instruction from the standby unit 2. Switch.

Further, the device side switching unit 4 is a spare unit 2
In response to a switching instruction from the line 111 and the active unit 1
The connection with -1 is switched to the connection between the spare unit 2 and the line 111.

Therefore, when the active unit 1-1 and the standby unit 2 are switched, the switching control unit 5 controls the switching process because the control target is limited to the active unit 1-1 and the standby unit 2. Can be simplified and the processing time required for the switching can be shortened.

FIG. 2 is a flow chart showing the operation of the switching control section 5 of FIG. The operation of the embodiment of the present invention will be described with reference to FIGS.

When the operation is started, the switching control section 5 always monitors the occurrence of an error in the working unit 1-i (step S1 in FIG. 2). When the occurrence of an error is detected in the working unit 1-i, The working unit 1-i
It is determined whether or not switching is possible (step S in FIG. 2).
2).

If the spare unit 2 is in the unused state, the switching control unit 5 determines that the active unit 1-i can be switched, and the active unit 1-i and the spare unit 2 are switched via the switching control bus 100. And switching control is performed on the backup unit 2 and the switching information for controlling the switching between the failed active unit 1-i and the backup unit 2 and output to the backup unit 2.

The spare unit 2 generates a switching instruction to the outside line switching unit 3 and the device side switching unit 4 based on the switching information from the switching control unit 5, and the generated switching instruction is sent via the switching control lines 121 and 122. It outputs to the outside line side switching unit 3 and the device side switching unit 4, respectively.

The outside line side switching unit 3 is a spare unit 2
In response to a switching instruction from the outside line 10i and the working unit 1
The connection with -i is switched to the connection between the external line 10i and the standby unit 2.

Further, the device side switching unit 4 is a spare unit 2
Line 11i and working unit 1 in response to a switching instruction from
-Switch the connection with i to the connection between the spare unit 2 and the line 11i.

When the connection of the outside line 10i and the line 11i is switched in the outside line side switching unit 3 and the device side switching unit 4, the upper device (not shown) starts recovery of the faulty working unit 1-i.

The switching control section 5 has its working unit 1-i.
The recovery status of the active unit 1-i is recovered (step S4 in FIG. 2), and when the active unit 1-i is recovered, switching control is performed between the active unit 1-i and the standby unit 2 via the switching control bus 100 to cause a system failure. Connection information for recovering the previous state is generated and sent to the standby unit 2 (step S5 in FIG. 2).

The spare unit 2 generates a switching instruction for the outside line side switching unit 3 and the device side switching unit 4 based on the connection information from the switching control unit 5, and sends the generated switching instruction through the switching control lines 121, 122. It outputs to the outside line side switching unit 3 and the device side switching unit 4, respectively.

The outside line side switching unit 3 is a spare unit 2
In response to a switching instruction from the outside line 10i and the standby unit 2
And the connection between the outside line 10i and the working unit 1-i.

Further, the device side switching section 4 is the standby unit 2
The connection between the line 11i and the line 11i is switched to the connection between the line 11i and the working unit 1-i in response to the switching instruction from the spare unit 2.

When the connection between the outside line 10i and the line 11i is switched in the outside line side switching unit 3 and the device side switching unit 4, the switching control unit 5 notifies the host device of the occurrence of a failure.

On the other hand, when the spare unit 2 is in use, the switching control unit 5 determines that the active unit 1-i cannot be switched, and sends fault information with a high degree of urgency to the host device ( 2 step S6).

As described above, the switching control unit 5 generates switching information for switching between the working unit and the standby unit in which a failure has occurred, and the switching unit 2 generates the switching information based on the switching information. By outputting an instruction to the outside line side switching unit 3 and the device side switching unit 4 to switch between the working unit 1-i in which a failure has occurred and the standby unit 2, control of the switching control unit 5 when executing protection switching The target can be limited to the one working unit 1-i and the spare unit 2 in which the failure has occurred. Therefore, the switching control process by the switching control unit 5 can be simplified, and the processing time required for switching can be shortened.

[0038]

As described above, according to the present invention, a plurality of working units and standby units are connected to an external line provided corresponding to the plurality of working units and a plurality of working units and standby units. One of the plurality of working units, including an outside line side switching circuit and a device side switching circuit for connecting the lines in the apparatus provided corresponding to the plurality of working units to the plurality of working units and the standby unit. When a failure occurs, the protection control circuit that controls the outside line side switching circuit and the device side switching circuit to switch between the failed working unit and the standby unit Switching information for switching between the unit and the spare unit is generated, and the outside line side switching circuit and the device side switching circuit are generated based on this switching information. By outputting the switching instruction from the spare unit to the people, it is possible to simplify the processing of the control switching by the switching control unit, there is an effect that it is possible to shorten the processing time required for switching.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of a switching control unit of FIG.

FIG. 3 is a block diagram showing a configuration of a conventional example.

[Explanation of symbols]

 1-1, 1-2 Working unit 2 Spare unit 3 External line switching unit 4 Device side switching unit 5 Switching control unit 100 Switching control bus 101 to 103 External line 111 to 113 Internal device line 121, 122 Switching control line

Claims (3)

[Claims] 1. A plurality of working units and spare units, an outside line provided corresponding to the plurality of working units, and an outside line side switching circuit for connecting the plurality of working units and the spare unit to each other; Of the plurality of working units, and a device-side switching circuit for connecting the plurality of working units and the spare unit to each other. A protection control circuit that controls the outside line side switching circuit and the device side switching circuit when it occurs to switch between the working unit and the standby unit in which the failure has occurred, and the failure occurs when the failure occurs. Generating means for generating switching information for switching the working unit and the spare unit, and the raw unit provided in the spare unit. A protection control circuit, comprising means for outputting a switching instruction to each of the outside line side switching circuit and the device side switching circuit based on the switching information generated by the forming means. 2. A determination means for determining whether or not the faulty working unit and the spare unit can be switched when the fault occurs, and the determining means switches between the working unit and the spare unit. The protection control circuit according to claim 1, further comprising means for outputting fault information to a higher-level device when it is determined to be impossible. 3. A monitoring unit for monitoring whether or not the faulty working unit has been restored, and when the monitoring unit detects the restoration of the faulty working unit, the working unit is checked before the fault. Creating means for creating connection information for connecting respectively to the external line and the line in the device which have been connected, and the external line side switching circuit based on the connection information provided in the spare unit and created by the creating means, 3. A device for outputting a switching instruction to each of the device side switching circuits.
The described protection control circuit.