KR19990010387A - Redundant module switching control circuit - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs

The present invention relates to a circuit for controlling switching between an active module and a redundant module with a standby module in a system having a redundancy structure.

I. The technical problem to be solved by the invention

Provided is a switching control circuit capable of switching between redundant modules without error when the active module is removed.

All. Summary of Solution of the Invention

It is installed to dismount the active module and detects the position of the ejector by installing a sensor corresponding to the ejector selected by the operator's operation as one of the hernia position and the mounting position. Switch the function of the active module to the standby module.

la. Important uses of the invention

Used to switch between redundant modules.

Description

Switching control circuit between redundant modules

The present invention relates to a system having a redundancy structure, and more particularly to a circuit for controlling switching between modules duplexed with an active module and a standby module.

In general, hardware modules, which are important in transmission systems, exchange systems, and communication systems, are basically duplicated to secure reliability to implement a redundancy structure. In other words, two modules having the same specific functions are duplicated in an active / standby structure so that one module is active while the other module is in standby. In this state, when a fault occurs in the active module, the standby module performs the function instead of the active module. Accordingly, even if a failure occurs in the active module, the function of the module can be continuously performed. At this time, the redundancy module includes a switching control circuit for controlling switching between each other. The switching control circuit of each module notifies the switching control circuit of the counterpart module when a failure occurs in its own module and hands over the information it has and then switches it.

On the other hand, in the system having a redundancy structure as described above, when the active module is artificially dismounted, an error occurs because information of the active module is lost to the standby module rather than being passed to the standby module. In order to prevent this error, it has been specified in the operating instructions to prevent the active module from herming. However, if the operator violated the error, he was forced to accept an error. Alternatively, when it is necessary to mount an active module, a method has been adopted in which an operator first executes a switching command in software to mount the active module in a state in which it is ready to switch between the active module and the standby module. . However, this method also resulted in an error if the operator accidentally dismounted the active module without switching to the standby module.

As described above, in the system having a redundancy structure, an error occurs when an active module is artificially dismounted without any action due to an error of an operator.

Accordingly, an object of the present invention is to provide a switching control circuit capable of switching between redundant modules without error when the active module is mounted.

1 is a configuration diagram of a redundancy module including a switching control circuit according to an embodiment of the present invention.

The present invention for achieving the above object is to install a sensor corresponding to the ejector (ejector) of the active module to detect the position of the ejector, and wait for the function of the active module before the active module is detached when the ejector is in the hernia position It features switching to the module. The ejector is a mechanism that is typically installed to dismount the module in the system and is selected to be one of the hernia position and the mounting position by the operator.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description and the annexed drawings, numerous specific details are set forth in order to provide a more thorough understanding of the present invention, such as specific circuit configurations, types or number of elements or components, and the like. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

1 is a block diagram of a duplex module including a switching control circuit according to an exemplary embodiment of the present invention. The duplexed two modules 100 and 102 each have main circuits 104 and 120 having the same unique functions. Separately, two switching control circuits 106 and 118 each having the same configuration and function are provided. In the following description, for convenience, it is assumed that the module 100 is the active module and the module 102 is the standby module among the modules 100 and 102.

First, referring to the switching control circuit 106 of the active module 100, in the conventional switching control circuit including the switching controller 108 and the data output buffer 116, the first and second sensors 110 and 112 and the OR gate ( OR gate) 114 is added. For reference, the function of the conventional switching control circuit is described as follows. First, the switching controller constantly monitors the state of the partner module by transmitting and receiving a redundancy control signal by handshaking with the switching controller of the partner module. In this state, when a failure signal is generated in the active module, the switching control unit of the active module transmits the information held by the active module together with the switching request signal to the standby module. The switching control unit of the standby module then enables the data output buffer of the standby module and activates the main circuits active. Thereafter, the switching controller of the active module disables the data output buffer of the active module. Thus, switching is made from the active module to the standby module. Here, the data output buffer is a buffer for outputting data to another module.

The first and second sensors 110 and 112 are installed on both sides of the active module 100 to correspond to ejectors (not shown) so as to detect that the ejector is in the hernia position. The ejector is a mechanism installed to hernia the module as described above and is selected by the operator to be one of the hernia position and the mounting position. The first and second sensors 110 and 112 use an optical sensor switch that is switched by the position change of the ejector, and are installed to generate a detection signal when the ejector is in the hernia position. Here, two sensors, that is, the first and second sensors 110 and 112 may be used instead of one to detect that the ejector is in the hernia position, but two examples are used to increase reliability.

Outputs of the first and second sensors 110 and 112 are input to the OR gate 114. The OR gate 114 is connected between the output terminals of the first and second sensors 110 and 112 and the switching controller 108, and applies a sensing signal generated from the first and second sensors 110 and 112 to the switching controller 108. . The switching control unit 108 switches the function of the active module 100 to the standby module 102 within a preset time when it is detected by the first and second sensors 110 and 112 that the ejector is in the hernia position. That is, in the related art, the switching controller 108 switches only when a failure signal is generated, but switches even when a detection signal is generated from any one of the first and second sensors 110 and 112 according to the present invention. To this end, the switching control unit 108 changes the software embedded in the switching control unit 108 to switch even when a detection signal is generated from any one of the first and second sensors 110 and 112. As described above, changing the software to perform the same operation on the additional input signal only needs to add the type of input.

Meanwhile, the switching control circuit 118 of the standby module 102 may also operate on the switching controller 122 and the data output buffer 130 in the same manner as the switching control circuit 106 of the active module 100. The sensors 124 and 126 and the OR gate 128 are added. The switching control circuit 118 of the standby module 102 is the same as the switching control circuit 106 of the active module 100 described above, a detailed description thereof will be omitted.

In the circuit of FIG. 1 as described above, if the operator operates the ejector to hernia the active module 100 and selects the hermetic position, the detection signal is detected by being detected by at least one of the first and second sensors 110 and 112. It is applied to the switching control unit 108 via the gate 114. In this case, the time required for the operator to attempt to hernia the active module 100, that is, the ejector to the hernia position to complete the hernia takes about several tens of seconds to several seconds. Therefore, it is necessary to send a switching request signal to the standby module 102 as soon as the ejector is in the hernia position. For this purpose, the first and second sensors 110 and 112 use an optical sensor switch having a high operating speed.

As described above, when the ejector of the active module 100 is detected to be in the hernia position, the switching controller 108 may change the standby module 102 of the standby module 102 within a few seconds before the active module 100 is herniad by the operator. The switching control unit 122 transmits the information held by the main circuit 104 of the active module 100 together with the switching request signal. Subsequent operation is the same as the conventional switching operation as described above.

Accordingly, when an operator attempts to hernia the active module 100, the function of the active module 100 may be switched to the standby module 102 before the active module 100 is herniad so that the redundant modules may be switched without error.

Also, after the standby module 102 is switched to the active module, even when the standby module 102 is detached with the active module 100 reattached, the standby module is similar to the case where the active module 100 is detached as described above. The switching control circuit 118 of 102 is operated, so that switching is performed without errors.

Meanwhile, in the above description of the present invention, specific embodiments have been described, but various modifications can be made without departing from the scope of the present invention. In particular, in the embodiment of the present invention, but two examples for one module to increase the reliability for detecting the ejector is in the hernia position, but only one may be used. As such, when only one sensor is used, the OR gates 114 and 128 do not need to be used. In addition, when the logic state of the sensor output is changed, a logic gate corresponding thereto is used instead of the OR gates 114 and 128. Therefore, the scope of the invention should not be defined by the described embodiments, but should be defined by the equivalent of claims and claims.

As described above, the present invention can switch between redundant modules without error by switching the function of the active module to the standby module before the active module is dismounted when the ejector is in the hernia position as the operator attempts to disengage the active module. There is an advantage.

Claims (4)

A circuit for controlling switching between an active module and a module duplexed with a standby module in a system having a redundancy structure, the circuit being installed for dismounting the active module, the ejector being selected from one of a mounting position and a mounting position by an operator's operation. Correspondingly installing a sensor to sense the position of the ejector, and switching the function of the active module to the standby module before the active module is dismounted when the ejector is in the hernia position. A circuit for controlling switching between an active module and a module duplexed with a standby module in a system having a redundancy structure, the circuit being installed for dismounting the active module, the ejector being selected from one of a mounting position and a mounting position by an operator's operation. A sensor installed correspondingly to the active module to detect that the ejector is in the hernia position, and the active module installed within the active module to detect the ejector to the hernia position within the preset time when the sensor is detected by the sensor. And a switching controller for switching a function of the standby module. The switching control circuit of claim 2, wherein the sensor is an optical sensor switch that is switched by a change in position of the ejector. 3. The optical sensor of claim 2, wherein the sensors are provided at both sides of the active module, and between two optical sensor switches for generating a detection signal when the ejector is in the hernia position, between the output terminal of the optical sensor switches and the switching controller. And a logic gate connected to the sensing controller to sense signals generated from the optical sensor switches.