JP2591472B2 - Protection control circuit - Google Patents

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 1: N redundant protection control system comprising 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,...), one spare unit 6,
The switching control between the working unit 1-i and the standby unit 6 in the system including the outside line switching unit 3, the device switching unit 4, and the switching control unit 7 is performed.

The switching control unit 7 is provided with a switching control bus 13
0, it is connected to the working unit 1-i, the standby unit 6, the outside line switching unit 3, and the device switching unit 4, respectively.

The working unit 1-i and the spare unit 6 respectively perform various processes such as format conversion on a signal input through an external line 10i such as a telephone line, and process the processed signal via a line 11i. Send it out in the device.

Here, for example, when a failure occurs in the working unit 1-1, the switching control unit 7 switches the switching control bus 130
, The failure of the working unit 1-1 is detected. Upon detecting a failure in the working unit 1-1, the switching control unit 7 switches the working unit 1-1, the standby unit 6, the outside line switching unit 3, and the device switching unit 4 via the switching control bus 130, respectively. The control is performed and the current unit 1-
1 is switched to the spare unit 6.

[0006]

The above-described conventional 1: N
In the protection control method, when a failure occurs in any of a plurality of working units, the switching control unit controls the working unit, the standby unit, the outside line switching unit, and the device side switching unit via the switching control bus. Must be performed, so that there are many control targets of the switching control unit.

Therefore, the switching control process by the switching control unit becomes complicated, and the processing time required for switching between the active unit and the spare unit in which a failure has occurred becomes long.

Accordingly, an object of the present invention is to provide a protection control circuit which solves the above-mentioned problems, simplifies the switching control processing by the switching control unit, and reduces the processing time required for switching. Is to do.

[0009]

According to the present invention, there is provided a protection control circuit comprising: a plurality of working units and a spare unit; external lines provided corresponding to the plurality of working units; and a plurality of the working units and the spare unit. An external line side switching circuit that performs connection of the plurality of working units, and a device side switching circuit that performs connection between the lines in the device provided corresponding to the plurality of working units and the plurality of working units and the spare unit. A protection control circuit that controls the external line side switching circuit and the device side switching circuit when a failure occurs in one of the plurality of working units to switch between the working unit and the spare unit in which the failure has occurred; At the time of the occurrence of the failure, switching information for switching between the active unit in which the failure has occurred and the spare unit is generated. Generation means for, and means for outputting a switching instruction to the circuit each switching circuit and the device-side switching the external side on the basis of said provided spare unit and switching generated by the generating means information, the occurrence of the fault
The working unit and the spare unit in which the failure has occurred sometimes
Determining means for determining whether or not switching is possible;
Means for switching between the working unit and the spare unit
Outputs failure information to the higher-level device when it is determined that
Means .

[0010]

[0011] Another protection control circuit of the present invention comprises:
In addition to the above configuration, a monitoring unit that monitors whether or not the working unit in which the failure has occurred has been restored, and the monitoring unit detects the recovery of the working unit in which the failure has occurred, causes the working unit to fail. Creation means for creating connection information for connecting to the previously connected outside line and the line in the apparatus, and the outside line switching based on the connection information provided in the spare unit and created by the creation means. Means for outputting a switching instruction to each of the circuit and the device-side switching circuit.

[0012]

The switching controller monitors the occurrence of a failure in the active unit, and outputs switching information to the spare unit when a failure occurs in the active unit. The switching instruction generated by the spare unit based on the switching information is transmitted to the outside line switching unit and the device switching unit 4.

With this, when switching between the active unit and the standby unit, the control target of the switching control unit 5 is limited to one active unit and the standby unit in which a failure has occurred. And the processing time required for the switching can be shortened.

[0014]

Next, an embodiment of the present invention will be described with reference to the drawings.

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

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

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

The device-side switching unit 4 is provided with a switching control line 1
The connection between the active unit 1-i and the standby unit 2 and the line 11i in the apparatus is switched in accordance with the switching instruction from the standby unit 2 input via the switch 22.

For example, when a failure occurs in the active unit 1-1 and the active unit 1-1 is switched to the standby unit 2, the switching control unit 5 switches the active unit 1-1 and the standby unit 2 via the switching control bus 100. And the switching control is performed.

At this time, the standby unit 2 responds to the switching control of the switching control unit 5 and switches control lines 121 and 122.
, And outputs a switching instruction to the outside line switching unit 3 and the device switching unit 4 respectively.

Here, the working unit 1-1 is connected to the outside line 101 via the outside line switching unit 3 and the device side switching unit 4.
And the outside line switching unit 3 is connected to the line 111, the outside line 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 protection unit 2 according to the switching instruction from the protection unit 2. Switch.

The device-side switching unit 4 is provided with a spare unit 2
111 and working unit 1 in response to a switching instruction from
-1 is switched to the connection between the standby unit 2 and the line 111.

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

FIG. 2 is a flowchart 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 unit 5 always monitors the occurrence of an error in the active unit 1-i (step S1 in FIG. 2). The working unit 1-i
It is determined whether or not switching is possible (step S in FIG. 2).
2).

When the standby unit 2 is in the unused state, the switching control unit 5 determines that the switching of the active unit 1-i is possible, and through the switching control bus 100, the active unit 1-i and the standby unit 2 are switched. , And outputs switching information for controlling switching between the active unit 1-i and the spare unit 2 in which the failure has occurred to the spare unit 2.

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

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

The device-side switching unit 4 is provided with the spare unit 2
11i and the working unit 1 according to the switching instruction from
The connection with -i is switched to the connection between the standby unit 2 and the line 11i.

When the connection between the external line 10i and the line 11i is switched in the external line switching unit 3 and the device side switching unit 4, the higher-level device (not shown) starts recovery of the active unit 1-i in which a failure has occurred.

The switching control unit 5 has its current unit 1-i
(Step S4 in FIG. 2), and when the working unit 1-i is restored, the switching control is performed on the working unit 1-i and the spare unit 2 via the switching control bus 100, and the system is failed. The connection information for restoring the previous state is generated and sent to the spare unit 2 (step S5 in FIG. 2).

The standby unit 2 generates a switching instruction for the outside line switching unit 3 and the device switching unit 4 based on the connection information from the switching control unit 5, and transmits the generated switching instruction via the switching control lines 121 and 122. Output to the outside line switching unit 3 and the device side switching unit 4 respectively.

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

The device-side switching section 4 is provided with the spare unit 2
The connection between the line 11i and the working unit 1-i is switched in accordance with the switching instruction from the standby unit 2.

[0035]

On the other hand, if the standby unit 2 is in use, the switching control unit 5 determines that the switching of the active unit 1-i is not possible, and sends fault information with a high degree of urgency to the host device ( FIG. 2 step S6).

As described above, when the failure occurs, the switching information for switching between the active unit and the spare unit in which the failure has occurred is generated by the switching control unit 5, and the switching unit 5 generates the switching information based on the switching information. An instruction is output to the outside line switching unit 3 and the device switching unit 4 to switch the active unit 1-i and the spare unit 2 in which a failure has occurred, thereby controlling the switching control unit 5 when executing protection switching. The target can be limited to one active unit 1-i and the spare unit 2 in which a 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 reduced.

[0038]

As described above, according to the present invention, a plurality of working units and spare units are connected, and external lines provided corresponding to the plurality of working units are connected to the plurality of working units and spare units. An external line-side switching circuit; and a device-side switching circuit for connecting a line in the device corresponding to the plurality of working units to the plurality of working units and the spare unit. In the case of a failure, a protection control circuit that controls the external line switching circuit and the device side switching circuit to switch between the failed working unit and the spare unit. Switching information for switching between a unit and a spare unit is generated, and an external line-side switching circuit and a device-side switching circuit are generated based on the 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 the drawings]

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

FIG. 2 is a flowchart illustrating an operation of a switching control unit in FIG. 1;

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 Outside line switching unit 4 Device side switching unit 5 Switching control unit 100 Switching control bus 101-103 Outside line 111-113 Line in device 121, 122 Switching control line

Claims (2)

(57) [Claims] An external line switching circuit for connecting a plurality of working units and spare units, an external line provided corresponding to the plurality of working units, and the plurality of working units and the spare unit, and A line in the device provided corresponding to the working unit and a device-side switching circuit for connecting the plurality of working units and the spare unit, wherein one of the plurality of working units has a fault. A protection control circuit for controlling the external line switching circuit and the device side switching circuit when a fault occurs to switch between the active unit and the spare unit in which the fault has occurred, wherein the fault occurs when the fault occurs Generating means for generating switching information for switching between the current working unit and the spare unit, the spare unit being provided in the spare unit; 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 generating means ;
The working unit and the spare unit in which the failure has occurred sometimes
Determining means for determining whether or not switching is possible;
Means for switching between the working unit and the spare unit
Outputs failure information to the higher-level device when it is determined that
Protection control circuit further comprising a means. 2. A monitoring means for monitoring whether or not the working unit in which the fault has occurred has been restored, and when the monitoring means detects the recovery of the working unit in which the fault has occurred, the working unit is activated before the fault. Creating means for creating connection information for connecting to the connected external line and the line in the apparatus, and the external line switching circuit provided in the spare unit and based on the connection information created by the creating means, 2. A protection control circuit according to claim 1 , further comprising means for outputting a switching instruction to each of said device-side switching circuits.