KR100306482B1 - N:1 Duplex System And Duplex Control Method In That System - Google Patents

Abstract

The present invention adds a circuit pack for implementing redundancy to a system having multiple N circuit packs performing the same function, and then connects each circuit pack to a common control signal line and a service channel to control N: 1 redundancy. The present invention relates to an N: 1 redundancy system and a redundancy control method in the system.

Conventionally, in the case of a system in which a plurality of circuit packs performing the same function is implemented, if the redundancy function is implemented, the redundancy function is not implemented due to excessive increase in the cost of the system configuration, in which case the circuit pack fails in the system. There was a problem that the overall service quality is lowered.

The present invention connects a plurality of circuit packs occupying in an active state to a plurality of N service channels based on a common control signal line and one circuit pack operating in a standby state, and then a predetermined service channel is activated. When a circuit pack occupied by a network fails, N: 1 redundancy control is detected by a standby circuit pack to enable it to occupy an active state for the corresponding service channel, thereby enabling a low cost N: 1 redundancy system. As a result, service quality can be prevented from being degraded due to a shortage of circuits.

Description

N: 1 Duplex System And Duplex Control Method In That System}

The present invention relates to an N: 1 redundancy system and a method for controlling redundancy in the system, and in particular, after adding a circuit pack for implementing redundancy to a system having a plurality (N) circuit packs performing the same function, The present invention relates to an N: 1 redundancy system and a method of redundancy control in the system, in which each circuit pack is connected to a common control signal line and a service channel to enable N: 1 redundancy control.

In general, redundancy control in a system operated by an electronic control signal is an N: N redundancy control method using an independent signal line between the A side and the B side, and has the same function on the A side and the B side based on the signal line. A plurality of circuit packs to perform is provided.

For example, in the redundant system having three circuit packs on the A side and the B side, respectively, as shown in FIG. 1, all six circuit packs have the same circuit pack and do not have redundancy and only perform unique functions. If so, there is no need to distinguish between A and B sides, and only three circuit packs are needed.

However, in order to implement a circuit pack with 3: 3 redundancy between the A side and the B side in the redundant system, between the circuit packs 11-1 to 11-3 and 12-1 to 12-3 on the A side and the B side, Each independent signal line is connected through the back board, and the circuit packs 11-1 to 11-3 and 12-1 to 12-3 on the A side and B side which are redundantly implemented are each provided with one service channel (S1 ~). It is connected to S3) and occupies the corresponding service channels S1 to S3 in the currently active circuit pack to perform its own function.

That is, in the redundant system, the first circuit pack 11-1 on the A side and the first circuit pack 12-1 on the B side, the second circuit pack 11-2 on the A side, and the second on the B side The circuit pack 12-2, the third circuit pack 11-3 on the A side, and the third circuit pack 12-3 on the B side are mutually redundant, and for example, the A side One circuit pack among the first circuit pack 11-1 and the first circuit pack 12-1 on the B side occupies the first service channel S1 in an active state, and performs a unique function. One circuit pack exists in a standby state for performing a unique function for the corresponding first service channel S1.

In the redundant system, the circuit packs 11-1 to 11-3 and 12-1 to 12-3 on the A side and the B side transmit and receive control signals for redundancy control. There are six paths: 'A1, B1, A2, B2, A3, and B3'. Each path (A1 ~ A3, B1 ~ B3) has a status signal to inform the other side of its status (active / standby), and Each signal line for a malfunction signal for informing whether a function failure (normal / disability) of is connected.

In this case, the paths A1 to A3 and B1 to B3 and the signal lines will be described in detail as follows.

In the corresponding paths 'A1, A2, A3' (hereinafter referred to as 'A side path'), the circuit packs 12-1 to 12-3 of the B side from the circuit packs 11-1 to 11-3 of the A side The state signal line and the malfunction signal line for informing the user of his or her condition and whether there is a functional failure are respectively connected, and the circuit pack of the B side is connected to the corresponding paths 'B1, B2, B3' (hereinafter referred to as 'B side path'). -1 to 12-3), the status signal line and the malfunction signal line for informing its status and a malfunction are connected to the circuit packs 11-1 to 11-3 on the A side, respectively.

In addition, the status signal transmitted and received through the corresponding status signal line indicates an active state (active state signal) in the case of '0' and a standby state (standby state signal) in the case of '1', and is a function transmitted and received through the corresponding malfunction signal line. The fault signal indicates a normal state (normal signal) in the case of '0' and a malfunction state (disorder signal) in the case of '1'.

When a functional failure occurs in the circuit pack in the conventional redundant system configured as described above, the circuit pack switching operation according to the 3: 3 redundancy control method will be described.

First, the circuit packs 11-1 to 11-3 and 12-1 to 12-3 on the A side and the B side are all in a normal state, and the circuit packs 11-1 to 11-3 on the A side are active. In the initial state when the circuit packs 12-1 to 12-3 on the B side are in a standby state, all the malfunction signal lines of the A side paths A1 to A3 and the B side paths B1 to b3 are '0'. The status signal line of the A-side paths A1 to A3 is '0', and the status signal line of the B-side paths B1 to B3 is '1'.

Subsequently, assuming that the first circuit pack 11-1 on the A side has a failure in its internal function, the first circuit pack 11-1 on which the corresponding function failure occurs has implemented its functional failure state by redundancy B. In order to inform the first circuit pack 12-1 of the side, the malfunction signal for the malfunction signal line of the path 'A1' is converted from '0' to '1', that is, the normal signal to the fault signal and transmitted.

Then, the first circuit pack 12-1 on the B side detects the failure signal from the malfunction signal line of the path 'A1' and compares it with its malfunction signal, and if it is recognized that it is in a normal state, the path ' A status signal having a value of '0', that is, an active status signal, is transmitted to the status signal line of B1 'to inform the first circuit pack 11-1 of the A side that has a functional failure that it has transitioned to the active state.

Accordingly, when the first circuit pack 11-1 on the A side detects the active state signal from the state signal line of the path 'B1', it transitions to the standby state and transmits to the state signal line of the path 'A1'. By transmitting the status signal '0' to '1', that is, converting the active status signal to the standby status signal, the circuit pack switching operation is terminated due to a functional failure. The circuit pack 11-2, the third circuit pack 11-3, and the first circuit pack 12-1 on the B side are active, and the first circuit pack 11-1 on the A side and the B side. The second circuit pack 12-2 and the third circuit pack 12-3 in the standby state.

Subsequently, even if a functional failure occurs in another circuit pack of the redundant system, the switching is performed between the redundant circuit packs through the same operation.

As described above, the conventional N: N redundancy control method is an extension of the general 1: 1 redundancy control method. In the case of a system in which a plurality of circuit packs performing the same function as the relay line matching part of the switching system are mounted, The application of a N: N redundancy control scheme causes excessive cost increase in the system configuration, and thus does not implement a redundancy function in each circuit pack.

However, in this case, that is, if a redundancy function is not implemented in a system in which a plurality of circuit packs performing the same function is implemented, if a function failure of the circuit pack occurs, the failed circuit pack and the service channel to which the circuit pack is connected By isolating the service, although the service channel can be used, there is a problem in that the quality of service related to the exchange service such as a shortage of a line is reduced when a call is set up for the corresponding exchange system.

As described above, in the case of a system in which a plurality of circuit packs that perform the same function are implemented in the related art, when the redundancy function is implemented, the redundancy function is not implemented due to an excessive increase in the cost of the system configuration. If a pack fails, there is a problem that the overall quality of service is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems described above, and an object thereof is to operate in a standby state and a plurality of circuit packs each occupying an active state for a plurality of (N) service channels based on a common control signal line. After connecting the circuit packs of the circuit pack, if a circuit pack that occupies a given service channel fails, N: 1 redundancy control is detected by the circuit pack in the standby state and occupied the active state for the service channel. By implementing the N: 1 redundancy system at low cost, the service quality is prevented from being degraded due to a shortage of circuits.

1 is a view showing a connection structure of a conventional redundancy system.

2 is a diagram illustrating a connection structure of a 3: 1 redundancy system according to an exemplary embodiment of the present invention.

3 is a configuration diagram for implementing 3: 1 redundancy of each circuit pack in FIG.

4 is a configuration diagram for controlling data transmission and reception through each service channel in FIG.

Explanation of symbols on the main parts of the drawings

21 ~ 24: Circuit pack 31: Bus monitoring unit

32: state transition request unit 33: state determination unit

34: input and output control unit 35: function performing unit

S1 ~ S3: Service Channel

A feature of the present invention for achieving the above object is, in a system having a plurality (N) of the circuit pack performing the same function, the plurality of (N) circuit pack and N: 1 redundancy Each circuit pack added for implementation is connected to a common control signal line, and each circuit pack is connected to each of N service channels, where the common control signal line is active in a circuit pack that is active for each service channel. A plurality of state control signal lines through which a state signal for informing a circuit pack of which a standby state is transmitted and received; A plurality of malfunction signal lines for transmitting and receiving a malfunction signal for notifying a circuit pack in a standby state of the circuit pack in the active state; And a plurality of state transition request signal lines for transmitting and receiving a state transition request signal for requesting a state transition from a circuit pack in the standby state to a circuit pack that is active for a predetermined service channel and has a malfunction.

In addition, each of the circuit packs are connected to N service channels, respectively, where N circuit packs occupy one service channel in an active state to transmit and receive data, and the other circuit pack for the N service channels. It is characterized by a standby state.

According to another aspect of the present invention, in a system having a plurality (N) of circuit packs performing the same function, the circuit pack may include a corresponding state transition request when state transition request information for a given service channel is received. A state transition request unit which transmits a standby state transition request signal through a signal line; When the predetermined service channel information and the active state transition request signal are received, the corresponding service channel is occupied in the active state, and at the same time, the active state signal is transmitted to the corresponding state signal line, and when the standby state transition request signal is received, the standby state is entered. A state determination unit which transitions and transmits a standby state signal to a corresponding state signal line side; An input / output controller configured to enable / disable transmission of the state signal and the state transition request signal transmitted from the state determination unit and the state transition request unit; In the active state, when a signal for requesting a state transition to the standby state is received from the state transition request signal line corresponding to the occupied service channel, a standby state transition request signal is transmitted to the state determination unit, and in the standby state, the standby state signal A bus monitoring unit which transmits corresponding service channel information and an active state transition request signal to the state determination unit when received, and transmits state transition request information on the corresponding service channel information to the state transition request unit when a failure signal is received; ; And a function performing unit connected to each of the service channels and performing a function specific to a circuit pack and simultaneously transmitting a function failure signal to a function failure signal line.

In this case, when the occupied channel information and the active state signal are received from the state determiner, the input / output controller decodes the occupied channel information to activate the state signal line corresponding to the service channel occupied in the active state and the malfunction signal line. And enable only the transmission output for the malfunction signal, and when the standby state signal is received from the state determination unit, enable the transmission output only for the state transition request signal to the state transition request signal line side. Enable enable ports corresponding to service channels occupied in an active state to enable only transmission buffers for corresponding state signals and malfunction signals, and in response to the state transition request signals in the standby state. Each transmit buffer associated with the enable port It is characterized by enabling only the bay.

Another feature of the present invention is to detect a fault signal transmitted by an active circuit pack and to transmit a standby state transition request signal for a corresponding service channel to the active circuit pack side; Detecting the idle state request signal and transitioning to a standby state and transmitting a standby state signal for the service channel; And detecting the standby state signal and transitioning to an active state with respect to the service channel.

The transmitting of the standby state transition request signal for the service channel to the active circuit pack side may include: checking whether an internal circuit function in the active circuit pack has a failure; Transmitting a failure signal to a corresponding malfunction signal line when a failure occurs; Detecting a failure signal in a circuit pack in a standby state and transmitting state transition request information for the service channel; And transmitting a standby state transition request signal to a corresponding state transition request signal line in response to receiving the state transition request information.

Further, the process of transmitting the standby state signal for the service channel may include: transmitting a standby state transition request signal upon detecting a standby state transition request signal transmitted by an active circuit pack; And translating an active state for the service channel to a standby state upon receiving the standby state transition request signal and transmitting a standby state signal.

In addition, the transitioning to the active state for the service channel may include transmitting the service channel information and an active state transition request signal upon detecting the standby state signal; And transitioning to an active state with respect to the service channel and transmitting an active state signal to a corresponding state signal line.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

N: 1 redundancy system of a system including N + 1 circuit packs according to the present invention, as shown in Figure 2 of the accompanying drawings, a number (N) of the circuit pack and N: 1 redundancy to perform the same function One circuit pack added to implement is connected to the state signal line, the malfunction signal line, and the state transition request signal line, which are common control signal lines, and each of the circuit packs has N service channels connected to each other, and N + 1 circuits. N circuit packs which are active among the packs have a structure in which each occupies one service channel to provide a service.

In this case, the accompanying FIG. 2 is for the convenience of description and the value of N representing the number of active circuit packs is '3', and the number of corresponding circuit packs may be increased or decreased. Assuming that the second circuit pack 22 and the third circuit pack 23 are active and the fourth circuit pack 24 is in the standby state, the 3: 1 redundancy system is active to perform the same function. There are three service channels 'S1, S2, S3' which are occupied by each of the three circuit packs 21, 22, and 23 in the state.

In detail, all of the circuit packs of the corresponding 3: 1 redundancy system are redundantly connected to each other, and three of the four circuit packs 21 to 24 occupy the active states for each of the service channels S1 to S3. The two circuit packs 21 to 23 perform their own functions, and the other circuit pack 24 is in a standby state for all service channels.

In addition, each of the circuit packs 21 to 24 connected to redundancy in the 3: 1 redundancy system transmits and receives redundancy control signals for redundancy control through a common control signal line, and each service channel S1 to the corresponding common control signal line. The state signal 'ACT (3: 1)' for notifying the circuit pack 24 in its standby state from the circuit packs 21 to 23 that are active for S3) and the circuit pack 21 in the active state. 23), the function failure signal 'FUF (3: 1)' to inform the circuit pack 24 in its standby state of its failure and the active state for the predetermined service channel in the circuit pack 24 in the standby state. And 9 signal lines for the state transition request signal 'REQ (3: 1)' for requesting a state transition to a circuit pack in which a malfunction has occurred, and all signal lines are pulled up. Sends the corresponding redundancy control signal from each circuit pack 21 to 24 Otherwise, the value '1' will be maintained.

In this case, the signal lines will be described in detail as follows.

The state signal 'ACT (3: 1)' transmitted and received through the corresponding state signal line is a signal transmitted by a circuit pack in an active state for each service channel 'S1, S2 and S3' and received by a circuit pack in a standby state. '0' indicates a state in which circuit packs 21 to 23 that are active for the corresponding service channel exist, and '1' indicates a state in which no circuit packs that are active for the corresponding service channel do not exist.

The malfunction signal 'FUF (3: 1)' transmitted and received through the corresponding malfunction signal line is transmitted by the circuit pack in the active state for the service channels S1, S2 and S3, and is received by the circuit pack in the standby state. In case of '0', the normal state of the circuit pack which is active for the corresponding service channel is indicated. In case of '1', it indicates the malfunction state of the circuit pack which is active in the corresponding service channel.

The state transition request signal 'REQ (3: 1)', which is transmitted and received through the corresponding state transition request signal line, is transmitted by a circuit pack waiting for the service channels 'S1, S2, and S3' and is active for the corresponding service channel. And a signal received by a circuit pack in which a malfunction has occurred, and in the case of '0', it indicates a state for requesting a transition to the standby state, and in the case of '1', it indicates a state in which a transition to the standby state is not requested.

Meanwhile, in the N: 1 redundancy system according to the present invention, each circuit pack 21 to 24 has a bus monitoring unit 31, a state transition requesting unit 32, and a state determination as shown in FIG. The unit 33 includes an input / output control unit 34 and a function performing unit 35.

The bus monitoring unit 31 has a signal (signal level '0') for requesting a state transition to a standby state from a state transition request signal line corresponding to a service channel occupied in an active state when its circuit pack is active. Upon reception, the standby state transition request signal STBY_REQ is transmitted to the state determiner 33. When the circuit pack is in the standby state, when the standby state signal (signal level '1') is received on the predetermined state signal line, the corresponding service channel information and the active state transition request signal ACY_REQ are transmitted to the state determiner 33. When the failure signal (signal level '1') is received on the predetermined malfunction signal line, the state transition request information (service channel information, REQ) for the corresponding service channel information is transmitted to the state transition request unit 32.

When the state transition request unit 32 receives the state transition request information for the predetermined service channel from the bus monitoring unit 31, the state transition request signal (signal level ') is applied to the state transition request signal line corresponding to the corresponding service channel. 0 ').

When the state determiner 33 receives the predetermined service channel information and the active state transition request signal ACT_REQ from the bus monitor 31, the state determiner 33 occupies the corresponding service channel in an active state and corresponds to the corresponding service channel. An active state signal (signal level '0') is transmitted to the state signal line side, and the occupied channel information and the active state signal are transmitted to the input / output controller 34. When the standby state transition request signal STBY_REQ is received from the bus monitoring unit 31, the standby state signal (signal level '1') is transmitted to the state signal line side at the same time as the state transition to the standby state. Is transmitted to the input / output control unit 34.

When the occupied channel information and the active state signal are received from the state determiner 33, the input / output control unit 34 decodes the occupied channel information to the state signal line and the malfunction signal line corresponding to the service channel occupied in the active state. The transmission outputs for the activation state signal and the malfunction signal are enabled, and the transmission outputs to the other state signal line, the malfunction signal line, and the state transition request signal line are disabled.

When the standby state signal is received from the state determination unit 33, the transmission output is enabled only for the state transition request signal 'REQ (3: 1)' to the state transition request signal line, and other common control signal lines, namely, The transmit output to the status signal line and the malfunction signal line side are disabled.

In detail, the transmission buffers 33-1 through the enable ports 'E1, E2, and E3' of the input / output control unit 34 are enabled / disabled between the state determination unit 33 and each state signal line. 33-3), and the transmission buffers are enabled / disabled through the enable ports 'E1, E2, and E3' of the input / output control unit 34 between the function performing unit 35 and each of the malfunction signal lines. 35-1 to 35-3, each of which is enabled / disabled through the enable port 'ES' of the input / output control unit 34 between the state transition request unit 32 and each state request signal line. Buffers 32-1 to 32-3 are provided, respectively.

Accordingly, the corresponding input / output control unit 34 transmits each of the transmission buffers 32-1 to 32-2, 33-1 to 33-3, and 35-1 to 35 through its enable ports 'E1, E2, E3, and ES'. Enable or disable -3) to enable or disable the transmit output for control signals 'ACT (3: 1), FUF (3: 1), REQ (3: 1)' to the corresponding common control signal line. Is enabled.

For example, if the service channel occupied in the active state is 'S1', the corresponding input / output controller 34 enables the corresponding enable port 'E1' to enable the status signal 'ACT (1)' and the function failure signal 'FUF'. Enable the transmit buffers 33-1 and 35-1 for (1), and disable the other enable ports 'E2, E3, ES' to enable the status signals 'ACT (2), ACT (3)'. Transmit buffers (33-2 to 33-3, 35-2 to 35-3, for over-function signals 'FUF (2), FUF (3)' and status transition request signal 'REQ (3: 1)'). 32-1 to 32-3) will be disabled.

In other words, the corresponding input / output control unit 34 is an enable port corresponding to the service channel occupied in an active state, that is, 'E1' for 'S1', 'E2' for 'S2', and 'E3' for 'S3'. Enable the transmit buffers 33-1 to 33-3 and 35-1 to 35-3 for the corresponding status signal 'ACT (3: 1)' and the malfunction signal 'FUF (3: 1)', respectively. Only the bay will be enabled.

In addition, when it is in the standby state, the corresponding input / output control unit 34 enables the enable port 'ES' and transmit buffers 32-1 to 32-3 for the state transition request signal 'REQ (3: 1)'. ) And enable ports 'E1, E2 and E3' are disabled so that each transmit buffer 33- for the status signal 'ACT (3: 1)' and the malfunction signal 'FUF (3: 1)' is disabled. 1 ~ 33-3, 35-1 ~ 35-3) will be disabled.

The function performing unit 35 is connected to the service channels S1 to S3, respectively, and performs a function specific to the circuit pack, and at the same time, functions a function failure signal 'FUF (3: 1)' to indicate whether there is a function failure. Transmit to fault signal line.

Meanwhile, in the present invention, as shown in FIG. 4 attached to the function performing unit 35 and each of the service channels S1 to S3, each service channel of the function performing unit 35 in the corresponding input / output control unit 34 ( Transmit buffers 35-1T to 35-3T and receive buffers 35-1R to 35-3R are provided for enabling or disabling data transmission and reception through S1 to S3, respectively. When the occupied channel information and the active state signal is received from the state determiner 33, the enable port corresponding to the corresponding service channel is enabled to enable the corresponding transmit buffer and receive buffer, thereby performing the corresponding function performing unit. Data can be transmitted and received only through the service channel occupied in the active state at 35.

The circuit pack switching operation according to the 3: 1 redundancy control method in the 3: 1 redundancy system according to the embodiment of the present invention, in which 3 + 1 circuit packs configured as described above are connected to each other by way of example, will be described below. .

First, the first circuit pack 21 for the first service channel S1, the second circuit pack 22 for the second service channel S2, and the third circuit pack 23 for the third service channel. The first circuit pack 21 occupies the active state with respect to S3 and the fourth circuit pack 24 is in the initial state in the standby state, and occupies the corresponding first service channel S1 in the active state. Suppose that a failure occurs in the function and the occupancy of the active state for the first service channel S1 is transferred to the fourth circuit pack 24.

That is, the function performing unit 35 of the first circuit pack 21 occupied in the active state with respect to the corresponding first service channel S1 has a functional failure signal having a signal level '0' as the first functional failure signal line in a normal state. 'FUF (1)' That is, the normal signal is continuously transmitted, and if a failure occurs in its internal function, the normal signal is converted into a failure signal (call level '1') and transmitted.

At this time, the bus monitoring unit 31 of the fourth circuit pack 24, which is currently in a standby state, continuously monitors the function failure signal 'FUF (3: 1)' of each function failure signal line, and then the first circuit pack in which the function failure occurs. When the failure signal transmitted by 21 is detected, the state transition request information for the first service channel S1 corresponding to the failure signal is transmitted to the state transition request unit 32.

Then, the state transition request unit 32 of the fourth circuit pack receives the state transition request information for the first service channel S1 from the bus monitoring unit 31 and corresponds to the corresponding first service channel S1. The state transition request signal 'REQ (1)', that is, the standby state transition request signal having the signal level '0' is transmitted to the first state transition request signal line.

Accordingly, the bus monitoring unit 31 of the first circuit pack 21 occupies the first service channel S1 in an active state despite the failure of an internal function, and thus the state of the fourth circuit pack 24. As the standby state transition request signal transmitted by the transition request unit 32 is detected in the first state transition request signal line, the standby state transition request signal STBY_REQ is transmitted to the state determination unit 33.

The state determination unit 33 receiving the standby state transition request signal STBY_REQ transitions the active state of the first service channel S1 currently occupied as the active state to the standby state and at the same time the signal level ' The active state signal of 0 'is converted to the standby state signal of signal level' 1 'and transmitted to the input / output controller 34.

Accordingly, the input / output control unit 34 enables only the transmission output of the state transition request signal line among the common control signal lines as the standby state signal is received from the state determination unit 33.

That is, the enable port 'ES' enables each transmit buffer 32-1 to 32-3 for the state transition request signal 'REQ (3: 1)', and the enable port 'E1' Switching to disable disables each of the transmission buffers 33-1 and 35-1 for the status signal 'ACT (1)' and the malfunction signal 'FUF (1)'. Accordingly, the corresponding first service channel is disabled. Since there is no circuit pack occupying in the active state with respect to S1, the signal level of the first state signal line and the first malfunction signal line is maintained at '1' by the pull-up.

On the other hand, the bus monitoring unit 31 of the fourth circuit pack 24 which is in the current standby state requesting the state transition to the active state for the first service channel S1 receives the state signal 'ACT (3: 1) of each state signal line. ), While the standby state signal transmitted by the first circuit pack 21 in which the functional failure occurs is detected on the first state signal line, the corresponding first service channel information and the active state transition request signal ACT_REQ are transmitted. The transmission is sent to the status determination unit 33.

Then, the state determiner 33 of the fourth circuit pack 24 receives the first service channel S1 information and the active state transition request signal ACT_REQ from the bus monitor 31, and thus the corresponding first service. Transitioning to the active state with respect to the channel S1 and simultaneously transmitting a state signal 'ACT (1)', that is, an active state signal having the signal level '0' to the first state signal line, and corresponding first service channel information and activity. The status signal is transmitted to the input / output control unit 34.

Accordingly, the input / output control unit 34 enables the transmission output only for the first state signal line and the first malfunction signal line among the common control signal lines as the first service channel information and the active state signal are received from the state determiner 33. Let's go.

That is, the enable port 'E1' enables the transmit buffer 33-1 for the status signal 'ACT (1)' and the transmit buffer 35-1 for the malfunction signal 'FUF (1)'. The enable port 'ES' is disabled to disable the respective transmit buffers 32-1 to 32-3 for the state transition request signal REQ (3: 1), thereby resulting in a function failure. The pack switching operation is terminated, and in this case, the redundancy device includes a first circuit pack 21 in a standby state, and a second circuit pack 22, a third circuit pack 23, and a fourth circuit pack 24. It becomes active.

Thereafter, even when a functional failure occurs in another circuit pack in the 3: 1 redundancy device, 3: 1 redundancy control through the same operation is performed.

As described above, the N: 1 redundancy system adds only one circuit pack operating in a standby state to N circuit packs performing the same function, so that any one circuit pack occupying a given service channel in an active state is functionally ineffective. When a failure occurs, N: 1 redundancy control is performed to switch the current standby circuit pack to occupy an active state for the corresponding service channel. It is possible to prevent the deterioration of quality of service.

In addition, the embodiments according to the present invention are not limited to the above-described embodiments, and various alternatives, modifications, and changes can be made within the scope apparent to those skilled in the art.

As described above, the present invention connects a plurality of circuit packs occupied in an active state to a plurality of N service channels based on a common control signal line and one circuit pack operating in a standby state, and then a predetermined service. N: 1 redundancy system at low cost by performing N: 1 redundancy control that detects when a circuit pack occupying an active channel fails and detects it in a standby circuit pack and makes it active for that service channel. This can prevent the degradation of service quality due to factors such as line shortage.

Claims (15)

In a system having a plurality of (N) circuit pack to perform the same function, The plurality of N circuit packs and the additional circuit packs for implementing N: 1 redundancy are respectively connected to a common control signal line, and each circuit pack is connected to each of N service channels. Work redundancy system. The method of claim 1, The common control signal line may include: a plurality of state control signal lines through which status signals for notifying a circuit pack in standby state are transmitted and received in a circuit pack that is active for each service channel; A plurality of malfunction signal lines for transmitting and receiving a malfunction signal for notifying a circuit pack in a standby state of the circuit pack in the active state; And a plurality of state transition request signal lines for transmitting and receiving a state transition request signal for requesting a state transition from a circuit pack in the standby state to a circuit pack that is active for a predetermined service channel and has a malfunction. Redundancy system. The method of claim 1, Each of the circuit packs is connected to N service channels, respectively, where N circuit packs occupy one service channel in an active state to transmit and receive data, and the other circuit pack is in a standby state for the N service channels. End-to-end redundancy system characterized in that. In a system having a plurality of (N) circuit pack to perform the same function, The circuit pack includes: a state transition request unit configured to transmit a standby state transition request signal to a corresponding state transition request signal line when state transition request information for a predetermined service channel is received; When the predetermined service channel information and the active state transition request signal are received, the corresponding service channel is occupied in the active state, and at the same time, the active state signal is transmitted to the corresponding state signal line, and when the standby state transition request signal is received, the standby state is entered. A state determination unit which transitions and transmits a standby state signal to a corresponding state signal line side; An input / output controller configured to enable / disable transmission of the state signal and the state transition request signal transmitted from the state determination unit and the state transition request unit; In the active state, when a signal for requesting a state transition to the standby state is received from the state transition request signal line corresponding to the occupied service channel, a standby state transition request signal is transmitted to the state determination unit, and in the standby state, the standby state signal A bus monitoring unit which transmits corresponding service channel information and an active state transition request signal to the state determination unit when received, and transmits state transition request information on the corresponding service channel information to the state transition request unit when a failure signal is received; ; And a function performing unit connected to each of the service channels and performing a function unique to a circuit pack and simultaneously transmitting a function failure signal to a function failure signal line. The method of claim 4, wherein When the occupied channel information and the active state signal are received from the state determiner, the input / output control unit decodes the occupied channel information to deactivate the occupied state signal line and the active state signal to the malfunction signal line. An end-to-end redundancy system enabling only a transmission output for a malfunction signal. The method of claim 4, wherein And a transmission buffer between the function execution unit and the function failure signal line, each of which is enabled / disabled through enable ports 'E1, E2, and E3' of the input / output control unit. The method of claim 4, wherein And a transmission buffer between the state determining unit and each state signal line, each of which is enabled / disabled through enable ports 'E1, E2, and E3' of the input / output control unit. The method of claim 4, wherein And the I / O controller enables the transmission output only for the state transition request signal to the state transition request signal line when the standby state signal is received from the state determiner. The method of claim 4, wherein And a transmission buffer between the state transition request unit and each state request signal line, the transmission buffer being enabled / disabled through an enable port 'ES' of the input / output control unit. The method of claim 4, wherein The input / output controller enables an enable port corresponding to a service channel occupied in an active state, respectively, to enable only a transmission buffer for a corresponding state signal and a malfunction signal, and in the standby state, responds to the state transition request signal. An end-to-end redundancy system enabling only each transmit buffer associated with a corresponding enable port. The method of claim 4, wherein A transmission buffer between the function execution unit and each service channel for enabling / disabling data transmission through each service channel of the function execution unit; And a reception buffer for enabling / disabling data reception through each service channel of the function execution unit. Detecting a failure signal transmitted by an active circuit pack and transmitting a standby state transition request signal for a corresponding service channel to the active circuit pack side; Detecting the idle state request signal and transitioning to a standby state and transmitting a standby state signal for the service channel; And detecting the standby state signal and transitioning to an active state with respect to the service channel. The method of claim 12, The step of transmitting a standby state transition request signal for the service channel to the active circuit pack side may include: checking whether an internal function of the active circuit pack has a failure; Transmitting a failure signal to a corresponding malfunction signal line when a failure occurs; Detecting a failure signal in a circuit pack in a standby state and transmitting state transition request information for the service channel; And transmitting a standby state transition request signal to a corresponding state transition request signal line in response to receiving the state transition request information. The method of claim 12, The step of transmitting a standby state signal for the service channel includes transmitting a standby state transition request signal upon detecting a standby state transition request signal transmitted by an active circuit pack; And translating an active state for the service channel to a standby state at the same time as receiving the standby state transition request signal, and transmitting a standby state signal. . The method of claim 12, Transitioning to the active state for the service channel may include transmitting the service channel information and an active state transition request signal upon detecting the standby state signal; And transitioning to an active state for the service channel and transmitting an active state signal to a corresponding state signal line at the same time.