KR0155335B1 - The control method for data communications board and the same duplexing interface circuit - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a board for data communication mounted on a commercial workstation, and more particularly, to a method and a structure for implementing a redundant connection function on a board for data communication supporting two channels (A channel and B channel). It provides a redundant communication path in the form of active and standby to the data communication board equipped with two communication channels (A channel and B channel) mounted on the station, and enables the real-time transfer to operate. It is to provide a reliable connection function in data communication.

Description

Redundant connection structure and control method in data communication board

1 is a block diagram illustrating a board for data communication according to an embodiment of the present invention.

2 is a block diagram of a communication board matching unit of FIG.

3 is a connection diagram of the communication board matching unit when the A channel is activated,

4A and 4B are flowcharts illustrating a redundancy switching process of A and B channels, respectively.

The present invention relates to a redundant connection structure in a data communication board and a control method thereof. In particular, in a data communication board mounted on a commercial workstation, an alarm indication generated in a target system is performed to perform a reliable redundant connection function. The present invention relates to a redundant connection structure of a data communication board including two communication channels in which redundancy switching is controlled in real time according to a signal, and a control method thereof.

In general, each computer system constituting a workstation has a board for data communication for network connection. At this time, in order to prevent the occurrence of a failure in data communication due to the loss of an access network connected to the data communication board used as a data transmission path or the occurrence of an error, a communication board is being supplied.

However, in the conventional communication board having the channel redundancy function, data communication is impossible when the communication parties do not sufficiently exchange opinions about an unexpected communication failure.

This is because, if a data error occurs while using the channel A, each user cannot recognize whether the current error condition is in his system or whether it is an error of a transmission network connected through the channel A.

Therefore, the conventional communication board is not able to recognize a sufficient reliability to the user during data communication, and there is a problem that inconvenience in use occurs.

In order to solve the above problems, in the present invention, the duplex connection structure of the data communication board having two communication channels and the alarm display signal generated from the counterpart system control the duplication transfer in real time. By providing a control method for a data communication board, it is intended to perform a reliable duplex connection function.

A feature of the present invention for achieving the above object is a data communication board having a redundant connection function, comprising: a data communication application unit in which a commercial workstation operates in a user area; A device driver unit 12 operating in the kernel region of a commercial workstation; It is equipped with a communication board matching unit mounted on a commercial workstation and used for communication with a counterpart system by a redundant connection function.

The data communication application unit is for communication with a counterpart system, and more specifically, transmits a message transmitted from a higher level application program to the device driver unit to transmit the message to the counterpart system, and transmits a message transmitted from the counterpart system through the device driver unit. After receiving, the received frame is inspected, analyzed and transmitted to the upper application.

The device driver unit operating in the kernel area of a commercial workstation is located between the data communication application unit operating in the user area and the communication board matching unit mounted on the internal system bus of the workstation, and the message transmitted from the data communication application unit. Transmits the message to the communication board matching unit, and transmits the message transmitted from the communication board matching unit to the data communication application unit.

The communication board matching unit mounted on the internal system bus of a commercial workstation manages the state of the redundant A and B channels, performs the redundancy switching function, and sends messages transmitted from the counterpart system through the activated channel to the device. It transmits to a driver part, and transmits the message transmitted from the said device driver part to a counterpart system.

In addition, the communication board matching unit notifies the data communication application unit of a current data transmission state and an operating state using a certain memory area to the data communication application unit through an upper device driver unit, and the device transmits the object code required for execution to the device. Download via the driver.

More specifically, the communication board matching unit includes an A channel and a B channel, an A channel management module and a B channel management module, and a communication processing module.

The A channel and the B channel directly transmit and receive an alarm indication signal and data from the system, and the A channel management module and the B channel management module receive an alarm indication signal received on the corresponding channel as an interrupt and perform processing related to redundancy switching. The communication processing module transmits and receives data with the counterpart system through an activated data path.

Hereinafter, with reference to the accompanying drawings will be described the most preferred embodiment of the present invention.

Hereinafter, in the embodiments to be described, the same reference numerals are regarded as devices of the same function or similar devices and steps of the same function or similar functions.

FIG. 1 is a block diagram of a data communication board according to an embodiment of the present invention, FIG. 2 is a block diagram of the communication board matching unit of FIG. 1, and FIG. 3 is a block diagram of the communication board matching unit when the A channel is activated. 4A and 4B are flow charts illustrating a redundant switching process of A and B channels, respectively.

First, the operation of a data communication board with a redundant connection function according to an embodiment of the present invention will be described with reference to FIGS. 1, 2, and 3.

Referring to FIG. 1, a data communication board having a redundant connection function according to an embodiment of the present invention includes a data communication application unit 1 operating in a user area of a commercial workstation and a kernel area of a commercial workstation. A device driver unit 2 connected to the data communication application unit 1 for transmitting and receiving messages, and having an A channel and a B channel to communicate with a counterpart system through one of two channels, and the device driver It consists of a communication board matching section 3 connected by the S-BUS interface with the device driver section 2 to send and receive messages between the section 2 and the counterpart system.

In order to communicate with the counterpart system, the data communication application unit 1 operating in the user area of a commercial workstation transmits a message transmitted from a higher level application program to the device driver unit 2, and the device driver 2 After receiving the message transmitted from the counterpart system from the partner system, the received frame is inspected, analyzed and transmitted to the upper application program.

The device driver unit 2 operating in the kernel area of a commercial workstation is located between the data communication application unit 1 and the communication board matching unit 3, and transmits a message transmitted from the data communication application unit 1. The communication board matching unit 3 transmits the message and the message transmitted from the communication board matching unit 3 to the data communication application unit 1.

The communication board matching unit 3 connected to the device driver unit 2 through the S-BUS interface manages the state of the redundant A channel and the B channel and performs a redundant switching function.

In addition, the communication board matching unit 3 transmits a message transmitted from the counterpart system through the activated channel to the device driver unit 2 and from the device driver unit 2 for transmission to another system. The transmitted message is transmitted to the counterpart system through the activated channel.

Internally, the communication board matching unit 3 notifies the data communication application unit 1 via the device driver unit 2 of the current data transmission state and the redundant operation state by using a predetermined memory area, and performs data communication. The object code required for execution is downloaded from the application unit 1 via the device driver unit 2.

Hereinafter, the structure and operation of the communication board matching unit 3 will be described in more detail with reference to FIG. 2.

Referring to FIG. 2, the communication board matching unit 3 is an A-channel 34 for transmitting and receiving an alarm display signal 34a and a data signal 34b with another system, and an alarm display signal 35a with another system. And an A channel management module 31 connected to an B channel 35 for transmitting and receiving a data signal 35b, an interrupt signal line 36 for processing the A channel 34 and an alarm display signal 34a, and The B-channel management module 33 connected to the B-channel 35 and the interrupt signal line 39 for processing the alarm display signal 35a, and the respective data that can be switched between the A-channel 34 and the B-channel 35. A communication processing module 32 connected to the signal lines 37 and 38 and connected to the device driver 2 through an S-BUS interface (not shown) is provided.

The A channel 34 and the B channel 35 transmit and receive alarm indication signals 34a and 35a and data signals 34b and 35b with the counterpart system.

In this case, if the alarm display signal is 'occurred', it indicates that an alarm has occurred in the counterpart system, and if it is 'disabled', it indicates that no alarm is generated in the counterpart system, that is, it is released.

When the A channel management module 31 and the B channel management module 33 generate or release an alarm indication signal on the corresponding channel, the A channel management module 31 and the B channel management module 33 determine the activation or standby of the corresponding channel in consideration of the current redundancy operation state, After changing the channel by setting the parameter, it performs the function of generating or releasing the alarm display signal to the corresponding channel to the counterpart system.

The communication processing module 32 transmits and receives a message in both directions between the device driver 2 and the activated channel through the activated data path.

That is, if the activated channel is the A channel 34, the message transmission from the A channel 34 to the device driver unit 2 and the device driver unit 2 between the A channel 34 and the device driver unit 2 Message transmission to the A channel 34 is performed.

3 shows an example of a path connection when the A channel 34 is activated. The communication processing module 32 transmits and receives a message with the A channel 34 through the active data path 37, and waits for the data path. 38 is a cut | disconnected state.

At this time, the alarm display signal 34a of the "release" is received from the counterpart system in the A channel 34, and the alarm display signal 34a of the "off" is also transmitted to the counterpart system.

On the contrary, in the B channel 35, the alarm indication signal 35a of 'occurrence' is being received and transmitted.

The B channel 35 is in a standby state and the data path 38 is disconnected, but the alarm indication signal 35b related to channel redundancy is under a control of the B channel management module 33 to transmit and receive.

In contrast, when the B channel 35 is activated, the message transmission and reception between the communication processing module 32 and the B channel 35 is performed through the data path 38, and the data path 37 is disconnected.

At this time, the alarm display signal 35a of 'off' is transmitted and received on the B channel 35, and the alarm display signal 34a of 'occurrence' is transmitted and received on the A channel 34.

As described above, the redundant channel switching is performed in real time only by the A channel management module 31 and the B channel management module 33 using the alarm display signals 34a and 35a.

The communication processing module 32 is not affected by the transmission of the message no matter which channel is selected as the active channel due to channel switching.

That is, since the data communication application unit 1 and the device driver unit 2 do not need to manage which channel is the active channel, the function related to redundancy is very simple.

Hereinafter, referring to FIGS. 4A and 4B, a redundant switching process of channels performed by the A-channel management module 31 and the B-channel management module 33 of the communication board matching unit 3 will be described.

4A is a flowchart illustrating a redundancy switching process of A channel, and FIG. 4B is a flowchart showing a redundancy switching process of B channel.

First, referring to FIG. 4A, the redundant switching process of the A channel is performed. The interrupt signal line 36 is driven by the alarm indication signal 34a transmitted from the other system to the A channel 34 so that the interrupt signal is managed by the A channel. It is received by the module 31 (S1).

Next, it is determined whether the alarm state of the A channel is 'off' or 'occurrence' from the received alarm display signal 34a (S2).

When the alarm intensity of the A channel is 'disabled' in the step S2, it is determined whether the alarm state of the B channel is 'disabled' or 'occurred' from the received alarm display signal 35a (S3).

Similarly, even when the alarm state of channel A is 'occurred' in step S2, it is determined whether the alarm state of channel B is 'disabled' or 'occurred' (S4).

In the above, four cases arise from the alarm states of the A and B channels.

① The first case where the alarm status of channel A is 'off' and the alarm status of channel B is 'occurring'.

② The second case where the alarm status of channel A is 'off' and the alarm status of channel B is 'off'.

③ The third case where the alarm state of channel A is 'occurred' and the alarm state of channel B is 'off'.

④ The fourth case where the alarm state of channel A is 'occurring' and the channel B alarm state is 'occurring'.

In the first case, channel A is active, while channel B is set to a standby state.

More specifically, the registers and parameters required for switching related to the A channel are set in the A channel management module 31 (S51).

A message can be transmitted and received in an active state of the data path 37 between the communication processing module 32 and the A channel 34, and the data path 38 between the communication processing module 32 and the B channel 35 is enabled. Is cut to the standby state, and the data path is switched to the A channel (S52).

In addition, the alarm indication signal 34a of 'off' is transmitted to the counterpart system through the A channel 34, and the alarm indication signal 35a of 'occurrence' is transmitted to the counterpart system through the B channel 35 ( S53). When the transmission is completed, the transfer process is terminated (S7).

In addition, the second case is an abnormal state in which both channels are activated and cannot logically exist.

However, in the actual case, it is an intermediate state that may occur temporarily in the process of transmitting and receiving an alarm indication signal with the counterpart system during redundancy switching.

In this case, the transfer process is terminated without changing the redundancy state so as to be stable to the final state (S7).

In the third case, the A channel is in the standby state, while the B channel is set to the active state.

More specifically, the registers and parameters required for switching related to the B channel are set in the A channel management module 33 (S61).

The data path 38 between the communication processing module 32 and the B channel 35 enables transmission and reception of messages in an active state, and the data path 37 between the communication processing module 32 and the A channel 34. Is cut to the standby state, and the data path is switched to the B channel (S62).

In addition, the alarm indication signal 35a of 'off' is transmitted to the counterpart system through the B channel 35, and the alarm indication signal 34a of 'occurrence' is transmitted to the counterpart system through the A channel 34 ( S63). When the transmission is completed, the transfer process is terminated (S7).

Finally, the fourth case is an abnormal state in which both channels are inactivated, and similarly to the second case, it is an intermediate state that may temporarily occur during the redundancy transfer.

Even in this case, the transfer process is terminated without changing the redundancy state so as to be stable to the final state (S7).

Next, referring to FIG. 4B, the redundant switching process of the B channel is performed. The interrupt signal line 39 is driven by the alarm indication signal 35a transmitted from the other system to the B channel 35 so that the interrupt signal is the B channel. It is received by the management module 33 (S1).

From the received alarm display signal 35a, it is determined whether the alarm state of the B channel is 'off' or 'occurrence' (S2).

When the alarm state of the channel B is 'disabled' in the step S2, it is determined whether the alarm state of the channel A is 'disabled' or 'occurred' from the received alarm display signal 34a (S8).

Similarly, even when the alarm state of channel B is 'occurred' in step S2, it is determined whether the alarm state of channel A is 'disabled' or 'occurred' (S9).

In the above, four cases occur from the alarm states of the A channel and the B channel.

① The first case where alarm status of channel B is 'off' and alarm status of channel A is 'occurring'.

② The second case where the alarm status of channel B is 'off' and the alarm status of channel A is 'off'.

③ The third case where the alarm state of channel B is 'occurred' and the alarm state of channel A is 'off'.

④ The fourth case where the alarm status of channel B is 'occurring' and the alarm status of channel A is 'occurring'.

In the first case, the B channel is set to an active state and the A channel is set to a standby state.

More specifically, in the B channel management module 33, registers and parameters required for switching related to the B channel are set (S101).

The data path 38 between the communication processing module 32 and the B channel 35 enables transmission and reception of messages in an active state, and the data path 37 between the communication processing module 32 and the A channel 34. Is cut to the standby state, and the data path is switched to the B channel (S102).

In addition, the alarm indication signal 35a of 'off' is transmitted to the counterpart system through the B channel 35, and the alarm indication signal 34a of 'occurrence' is transmitted to the counterpart system through the A channel 34 ( S103). When the transmission is completed, the transfer process is terminated (S7).

In addition, the second case is an abnormal state in which both channels are activated and cannot logically exist.

However, in the actual case, it is an intermediate state that may occur temporarily in the process of transmitting and receiving an alarm indication signal with the counterpart system during redundancy switching.

In this case, the transfer process is terminated without changing the redundancy state so as to be stable to the final state (S7).

In the third case, the B channel is set to the standby state and the A channel is set to the active state.

More specifically, the registers and parameters required for switching related to the A channel are set in the B channel management module 33 (S201).

The data path 37 between the communication processing module 32 and the A channel 34 enables active transmission and reception of messages, and the data path 38 between the communication processing module 32 and the B channel 35. Is in the truncated state, and the data path is switched to the A channel (S202).

In addition, the alarm indication signal 34a of 'off' is transmitted to the counterpart system through the A channel 34, and the alarm indication signal 35a of 'occurrence' is transmitted to the counterpart system through the B channel 35 ( S203). When the transmission is completed, the transfer process is terminated (S7).

Finally, the fourth case is an abnormal state in which both channels are inactivated, and similarly to the second case, it is an intermediate state that may temporarily occur during the redundancy transfer.

Even in this case, the transfer process is terminated without changing the redundancy state so as to be stable to the final state (S7).

Effects of the present invention configured and operated as described above are as follows.

When the target system for digital mobile communication connects a commercial workstation such as an operation maintenance device to the internal communication network, the redundant connection function increases the reliability of the path in data communication.

In addition, switching can be performed in real time by switching channels independently by the neck display signal only in the communication board matching unit, thereby minimizing data loss and minimizing the modules related to redundancy so that the redundancy connection function can be implemented very simply and clearly. .

Claims (2)

A data communication application unit operating in the user domain of a commercial workstation and transmitting and receiving messages to and from a higher level application program, a device driver unit and a counterpart system operating in the kernel domain of a commercial workstation and transmitting and receiving messages to and from the data communication application unit, A data communication board comprising a communication board matching unit for transmitting and receiving messages between device driver units, wherein the communication board matching unit is connected to a counterpart system to transmit and receive an alarm indication signal and a data signal indicating whether the counterpart system is normal or not. And a B channel; Driven by the interrupt request of the A channel, and after setting the state of each channel to 'Active' or 'Standby' from the alarm indication signal received on the A and B channels, the state of the channel is 'Active' An A-channel management module for connecting the data path of the 'in channel and blocking the data path of the channel whose channel state is' waiting'; Driven by the interrupt request of the B channel, and after setting the state of each channel to 'active' or 'standby' from the alarm indication signal received on the A and B channels, the state of the channel is 'active' A B-channel management module for connecting the data path of the 'in channel' and blocking the data path of the channel whose channel state is 'waiting'; And the A channel management module and the B channel management module connected to the data path of the A channel or the B channel and interfaced with the device driver to transmit and receive data between the channel to which the data path is connected and the device driver. Board for data communication with a redundant connection function, characterized in that consisting of a communication processing module to perform. A first step of determining, when an interrupt signal is received from one channel, whether an alarm indication signal applied to the one channel for which the interrupt is requested is 'alarm occurrence' or 'alarm release'; Determining whether the state of the alarm display signal applied to the other channel is 'alarm generation' or 'alarm release'; As a result of the determination of the first step and the second step, when the state of the alarm display signal applied to the two channels is 'alarm release' or 'alarm occurrence' state, the redundancy state is not changed to be stable to the final state. Terminating the transfer process; And when the state of the alarm display signal applied to the two channels is different as a result of the determination in the first and second steps, the data path of the channel whose state is 'alarm release' is connected, and the state is 'alarm'. And a data path of a channel, which is 'occurred', is configured in a fourth step of blocking the data path of the data communication board.