JPH088997A - Redundant control device - Google Patents

Abstract

(57) [Abstract] [Purpose] Controls the operating states of the control unit and the transmission control unit in the duplicated control device by the sub operation instruction signal output from the switching control unit. [Configuration] Uniquely by mutually monitoring the states in the switching control units 1 and 1 ′ that mutually input / output the own control unit states 6 and 6 ′ own control unit abnormalities 7 and 7 ′ in the duplicated control device The control unit to be operated is determined, and the operation instruction signals 4 and 4'are used to instruct the control units 2 and 2'transmission control units 3 and 3'to operate. Even if the state of both control units is not suitable for operation according to the determination result of the switching control unit 1, 1 ', one of the control units outputs the sub-operation instruction signal 5, 5',
Continue the minimum operation of the device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duplex controller for controlling duplex operation of a control unit and a transmission control unit in a high-speed optical LAN device for comprehensively transmitting voice and data.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing the configuration of a conventional duplex control device. In FIG. 4, 1 is a switching control unit that performs duplex control, 2 is a control unit that manages operation of the apparatus, 3 is a transmission control unit that exchanges communication data, and 4 is an operation instruction for the control unit 2 and the transmission control unit 3. Is an operation instruction signal for performing. Signals of the own control unit status 6 and the own control unit abnormality 7 are mutually input between the respective switching control units.

Next, the operation of the above conventional example will be described.
In FIG. 4, it is assumed that the switching control unit 1 side is in operation and the switching control unit 1 ′ side is in a standby state. In this state, the control unit 2
Alternatively, when an abnormality occurs in the transmission control unit 3, the switching control unit 1 sets the own control unit state 6 (partner control unit state 8 ′) to the standby state, sets the operation instruction signal 4 to non-operation, and at the same time outputs the own control unit abnormality 7 (Control unit abnormality 9 ′) is abnormal. The switching control unit 1 ′ transitions its own control unit from the standby state to the operating state when the control unit abnormality 9 ′ is input, and operates the operation instruction signal 4 ′.

As described above, in the above-described conventional duplex control device, the other control unit abnormality signals are mutually monitored, and the duplex control can be generated when the other control unit abnormality occurs when the self control unit is normal.

[0005]

However, in the above-mentioned conventional duplex control device, when an abnormality has already occurred in one of the control units or the transmission control unit, the other control unit or the transmission control unit is operated. In the event of a double failure that an abnormality occurs, both switching control units determine that their own control units are inoperable, and it becomes impossible to provide the function as a device.

The present invention solves such a conventional problem, and when an abnormality occurs in both control units, the control unit that was operating last outputs a sub-operation signal, It is an object of the present invention to provide an excellent duplex control device that provides a minimum function such as an abnormal recovery process as a device by utilizing a part of the functions.

[0007]

In order to achieve the above object, the present invention provides a sub operation instruction signal in addition to a conventional operation instruction signal, so that when an abnormality occurs in the control unit and the transmission control unit. The operation of the device can be maintained by inputting the sub-operation instruction signal to the functional parts that must be maintained at a minimum.

Further, since the transition to the state "operation / abnormal" of the switching control unit for outputting the sub-operation instruction signal occurs, the switching control unit in the "operation / normal" state outputs a partner control unit abnormality signal. When an abnormality occurs in the self control unit when the abnormal signal of the partner control unit is monitored, the operation state is changed to the "operation / abnormal" side without waiting.

[0009]

Therefore, according to the present invention, the sub-operation instruction signal is output from the switching control unit that has been used last when an abnormality occurs in both of the control units, so that either one of the control unit and the transmission control unit is activated. It becomes possible to operate a part of the function. As a result, it is possible to provide the functions that must be maintained at least as a device such as the device failure management function, the failure notification function, and the recovery function, and even under the double failure that both control units fail. It is possible to take a recovery measure without completely stopping the device, and improve the reliability of the device.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of an embodiment of a duplex control device of the present invention. In FIG. 1, the same components as those of the conventional example of FIG. In this embodiment, the sub operation instruction signal 5 is added in addition to the operation instruction signal 4.

FIG. 2 is a state transition diagram for explaining the operation of the duplex control apparatus of this embodiment. As shown in this figure, when the abnormality occurs in both control units, the sub-operation instruction signal is output from the switching control unit that was operating last, so that some of the functions of either one of the control unit and the transmission control unit are Can be operated. As a result, it becomes possible to provide the functions that must be maintained at least as a device, such as the device failure management function, the failure notification function, and the recovery function, even under the double failure that both control units fail. It is possible to take a recovery measure without completely stopping the device, and improve the reliability of the device.

FIG. 3 is a block diagram showing an embodiment of the duplex control device of the present invention. In FIG. 3, 11 is an optical transmission line interface unit that processes data transmitted and received from the transmission control unit 12 to and from the optical transmission line, and 15 is a line that sends and receives data processed by the transmission control unit to various terminals. This is the interface part. The transmission control unit monitors and manages the operation by the control unit 13, and at the same time, the control unit 13 itself manages the operation state between the duplicated control units. Also,
The switching control unit 14 mutually inputs each signal 17 of the self control unit status and the self control unit abnormality, and outputs each control signal of the operation instruction signal 19 and the sub operation instruction signal 25 to the control unit and the transmission control unit. To do.

Next, the operation of the configuration of FIG. 3 will be described.
The data input from the optical transmission line is input to the transmission control unit 12 on the operation side via the optical transmission line interface unit 11,
After data processing, the data is output to various terminals via the line interface unit 15. The operation control signal 1 output from the switching control unit determines which transmission control unit is used.
9 and the sub-operation instruction signal 25, and only the transmission control unit on the operation side processes the data. Also, by any chance,
When an abnormality occurs in the transmission control unit 12 and the control unit 13, the transmission control unit on the standby side is put into the operating state to continue the operation as the device. As described above, according to the above-described embodiment, the operation state of the transmission control unit can be controlled by the operation instruction signal 19.

In addition to this, in the present invention, when an abnormality occurs in the device and both switching control units cannot output the operation instruction signal 19, the switching control unit outputs the sub-operation instruction signal 25 to perform transmission control. There is an effect that a part of the functions of the unit 12 can be continuously operated and the minimum operation state of the entire apparatus can be continued.

[0015]

As is apparent from the above-described embodiment, the present invention adds a sub-operation instruction signal having a meaning in an abnormal state in addition to an operation instruction signal used in a normal state, so that the operation state of the apparatus can be maximized even in an abnormal state. Since the function that should be maintained at least as a device can be continued even if a failure occurs in both circuits at the same time in the redundant device, the reliability in the redundant device can be improved. .

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a duplex controller according to the present invention.

FIG. 2 is a state transition diagram for explaining the operation of the duplex control device according to the present embodiment.

FIG. 3 is a block diagram showing an embodiment of a duplex control device of the present invention.

FIG. 4 is a block diagram of a conventional duplex control device.

[Explanation of symbols]

 1, 1'Switching control unit 2, 2'Control unit 3, 3'Transmission control unit 4, 4'Operation instruction signal 5, 5'Sub-operation instruction signal 6, 6'Self control unit status 7 7'Self control unit error 8, 8'Counterpart controller status 9, 9'Counterpart controller abnormality 11 Optical transmission line interface section 12 Transmission control section 13 Control section 14 Switching control section 15 Line interface section 16 Data signal 1 17 Self-control section status / self-control section Abnormality 18 Communication signal between control units 19 Operation instruction signal 20 Transmission control unit control line 21 Data signal 2 22 Monitoring control signal 23 Monitoring control device 24 Power supply device 25 Sub-operation instruction signal

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Claims (1)

[Claims] 1. A duplex control device capable of taking four states by a combination of a self-control unit status signal that can take two states of operation / standby and a self-control unit abnormality signal that can take two states of normal / abnormal, By defining a logically impossible state of "operation / abnormality", even when the device is in an abnormal state, the sub-operation instruction signal is sent by the control unit that was the last operation in the redundant switching control unit. A redundant control device that outputs and provides the minimum functions of the device under abnormal conditions.