JP2888283B2 - Full duplex data communication device and full duplex data transmission system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a full-duplex data communication device and a full-duplex data transmission system.

[0002]

2. Description of the Related Art In a conventional full-duplex data transmission system, a system having a failure detecting means when a failure occurs is disclosed in, for example, Japanese Patent Application Laid-Open No. 62-226745. In the system disclosed in this publication, the data communication means is provided in the receiving communication device (slave station),
Failure detection is being performed. Other conventional examples often detect a failure when a failure occurs by transmitting and receiving status data.

FIG. 6 is a block diagram showing an example of a conventional full-duplex data transmission system. Referring to FIG. 6, in communication device 61, operation monitoring processing section 615 periodically outputs status data. The transmission data editing processing unit 611 preferentially outputs the status data received from the operation monitoring processing unit 615 to the transmission processing unit 612 with respect to the transmission data output from the data processing unit 610.
The transmission processing unit 612 outputs the data received from the transmission data editing processing unit 61 to the line 73a.

In the communication device 62, a reception processing unit 623
Receives the data transmitted on the line 73a and outputs it to the received data decryption processing unit 624. The received data decryption processing unit 624 identifies the data to be output to the data processing unit 620 and the status data, and outputs the status data to the operation monitoring processing unit 625. Operation monitoring processing unit 625
Performs failure detection when a failure occurs by monitoring whether status data is received periodically.

In the above description of the conventional example, the parts indicated by broken lines in FIG. 6 are not described, but the communication device 61 is provided with a reception processing unit 613 and a reception data decoding processing unit 61.
And the communication device 62 includes a transmission data edit processing unit 62
1 and a transmission processing unit 622. Transmission processing unit 62
A line 73b is provided between the reception processing unit 613 and the reception processing unit 613.

[0006] Japanese Patent Application Laid-Open No. Hei 1-292052 discloses a method of isolating a failed part when a failure occurs in a communication device. In this gazette, when a failure occurs, a system maintainer uses a tester to isolate a failed part.

As described above, in this type of conventional full-duplex data transmission system, when a failure occurs, the failure detection is automatically performed. Are using a tester such as a tester.

[0008]

The conventional full-duplex data communication system has the following problems.

The first problem is that it takes time to detect a failed part after detecting a failure.

[0010] The reason is that it is necessary for a maintenance person to use a tester to isolate a faulty part.

A second problem is that information for restoration cannot be quickly obtained.

[0012] The reason is that it takes time for a maintenance person to search using a manual or the like.

An object of the present invention is to provide a full-duplex data communication device and a full-duplex data transmission system that can quickly detect a failed part after detecting a failure.

Another object of the present invention is to provide a full-duplex data communication device and a full-duplex data transmission system that can promptly obtain information for restoration.

[0015]

According to the present invention, a full-duplex data communication apparatus according to the following aspects (1) to (3) and a full-duplex data transmission system according to the aspect (4) are obtained.

Aspect (1) It has a return path for returning a line by its own device, and means for switching the line to the return route when a failure in the full-duplex data transmission system is detected. A full-duplex data communication device for identifying whether a failure of its own device or a failure of a partner device by verifying whether or not the status data is output to the partner device. Full duplex data communication, characterized in that the possibility of a failure in the communication device is detected, and when the failure is specified in the partner device, the fact is notified to the partner device using the status data. apparatus.

Aspect (2) The apparatus further comprises means for outputting test data to the switched return path and tracing and verifying the flow of the processing to detect a failed part in the apparatus. The full-duplex data communication device according to aspect (1).

Aspect (3): A database in which information for recovering from failures assumed for each part in the apparatus is stored in advance, and the failure contents assumed from the database when a failed part is detected Means for retrieving information for recovery from a fault, and for displaying information indicating the detected failure site, information indicating the details of the failure, and information for recovery from the failure. Full-duplex data communication device.

Aspect (4) A full-duplex data transmission system comprising the full-duplex data communication device according to any one of aspects (1) to (3).

[0020]

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A full-duplex data communication apparatus and a full-duplex data transmission system according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a full-duplex data transmission system including a full-duplex data communication device according to an embodiment of the present invention. Referring to FIG. 1, the communication device 1 includes:
It has an operation monitoring / failure processing unit 101 that constantly monitors that data transmission is normally performed, and automatically detects a failed part when a failure occurs. The line switching processing unit 102 controls the switching units 103a and 103b for all
The switching between the connection with the heavy data transmission paths 3a and 3b and the connection with the return path 104 when a failure is detected is performed under the control of the operation monitoring / fault processing unit 101.

The communication device 1 also obtains information on a failed part automatically detected by the operation monitoring / fault processing unit 101,
A display processing unit 106 is provided for searching the database 105 for information necessary for failure recovery and notifying a maintenance person.

The transmission data editing unit 11 edits the transmission data received from the data processing unit 10a, the status data and the test data received from the operation monitoring / failure processing unit 101, and outputs them to the transmission processing unit 12. .

The received data decryption processing unit 14 selects a data processing unit 10b from the data received from the reception processing unit 13.
To be output to the server and the operation monitoring / fault processing unit 10
The status data and the test data to be notified to No. 1 are selected and output to respective notification destinations.

Next, the operation of the operation monitoring / failure processing unit 101 will be described.

FIG. 2 is a diagram showing normal processing by the operation monitoring / failure processing unit 101.

Referring to FIG. 2, operation monitoring / failure processing unit 1
01 outputs status data to the transmission data editing processor 11 (step S201). The status data is output by the transmission processing unit 12 to the full-duplex data transmission path 3a.

Upon receiving the status data from the communication device 1, the communication device 2 returns the status data. The status data returned by the communication device 2 is 2
The received data is received by the reception processing unit 13 from the heavy data transmission path 3b, and is received by the operation monitoring / failure processing unit 101 via the received data decryption processing unit 14 (when there is a status data response in step S202).

In the received status data, an abnormality is detected in step S203. Subsequently, if there is no abnormality as a result of the above determination in step S204, it can be understood that the system is operating normally. In a normal state, status data is periodically output in step S205 by output control using a timer (not shown). That is, at the time of normal, step S20
Steps 1 to S205 are repeatedly performed.

Next, the processing when a failure occurs will be described. At the time of occurrence of a failure, it is determined in step S202 in FIG.
At 204, an abnormality is detected based on the status data, and step S206 of failure determination is started. In step S206 of the failure determination, the number of abnormalities is counted,
If the number of abnormalities is less than the specified value, the status data is output as a continuous monitor. If the number of abnormalities exceeds the specified value, it is determined that a failure has occurred,
Perform the processing at the time of failure detection.

FIG. 3 is a diagram showing processing when the operation monitoring / failure processing unit 101 detects a failure.

At the stage of detecting a failure, since a failed portion has not yet been isolated, status data to which a system failure flag (index) has been added to notify the communication device 2 that a failure has occurred in the system. Is output (step S207).

Next, after the switching control to the loopback path 104 is performed for the line switching processing unit 102 in step S208, test data is output in step S209 to specify the faulty part.

For the test data, each processing block notifies the operation monitoring / fault processing unit 101 that the test data has been received, so that the failure portion can be traced and investigated. Can be automatically detected.

Further, the information on the automatically detected failure part is notified to the display processing unit 106. Display processing unit 106
Performs a process of searching the database 105 for information necessary for recovery from the failure at the failure site and notifying the maintenance person.

Next, the operation when a failure occurs in the transmission circuit of the communication device 2 will be described with reference to FIG.

In a normal state, status data to which a flag indicating that the system is normal is transmitted and received between the communication apparatus 1 and the communication apparatus 2.

When a failure occurs in the transmission circuit of the communication device 2, the communication device 2 can receive the status data from the communication device 1, but cannot return the status data to the communication device 1.

Since the communication device 1 does not receive the response of the status data from the communication device 2, it repeatedly transmits the status data, but when it detects no response more than the specified number of times, it determines that a failure has occurred. Judgment is made, and the status data to which the system abnormality flag is added is transmitted to the communication device 2.

However, at this point, there is a possibility that the receiving circuit of the communication device 1 may be out of order. Therefore, the communication device 1
Switches the line from the full-duplex data transmission paths 3a and 3b to the return path 104, and performs diagnosis based on test data. When the test data is received normally, it can be determined that the communication device 1 is normal and the communication device 2 has failed.

Since the communication device 1 itself is normal,
The line is returned to the full-duplex data transmission path 3a, 3b, and the communication device 2 is notified of the occurrence of the failure by status data. When receiving the status data from the communication device 1, the communication device 2 can recognize that a failure has occurred in its own transmission circuit.

The operation when a failure occurs in the receiving circuit of the communication device 1 will be described with reference to FIG.

Even if a failure occurs in the receiving circuit of the communication device 1, data is normally transmitted on the full-duplex data transmission lines 3a and 3b. The failure occurrence is detected when the communication device 1 has detected the status data cannot be received from the communication device 2 a specified number of times.

When the communication device 1 detects a failure, status data with a system abnormality flag is transmitted / received. Before that, the system normal flag is added even after the failure occurs. Status data is being sent and received.

When the communication device 1 detects a failure in which status data cannot be received from the communication device 2, it is determined whether the receiving circuit of the communication device 1 has failed.
Alternatively, it remains unknown whether the transmission circuit of the communication device 2 has failed.

If the communication device 1 performs the diagnosis based on the test data by switching to the return path, when it is determined that the test data cannot be received, it is detected that the communication device 1 has failed, and Carving is performed. Further, by tracing the flow of processing of test data, it becomes possible to recognize that the failure site is the receiving circuit instead of the transmitting circuit.

As described above, in the present system, when a failure occurs in the communication device 1 itself, the failure is detected based on the test data, and the detailed information of the failed part can be obtained, so that the system is restored. The time until the time can be shortened.

Further, the maintenance staff is notified not only of the information on the faulty part but also information necessary for the recovery work.
It is possible to minimize the influence of the failure of the communication device on the system.

[0050]

The full-duplex data communication device according to the present invention is
It has a loopback path for looping the line in the own device, and means for switching the line to the loopback path when a failure in the system is detected. Since it is necessary to identify whether the failure has occurred or the partner device has failed, it is not necessary for the maintenance person to use the tester to determine the failure location, and the failure location can be quickly detected after the failure detection. This effect is further enhanced if test data is output to the switched return path and a means for detecting a failed part in the own apparatus by tracking and verifying the flow of the processing is provided.

Further, a database preliminarily storing information for failure recovery for a failure content assumed for each part in the apparatus, and a failure recovery for the failure content assumed from the database when a failure part is detected. And information for indicating the detected failure part, information indicating the details of the failure, and means for displaying information for failure recovery, the maintenance person can manually retrieve the recovery information. There is no need to search for, and recovery work is performed quickly.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a full-duplex data communication device according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating an operation of an operation monitoring / failure processing unit in the full-duplex data communication device shown in FIG. 1;

FIG. 3 is a flowchart for explaining the operation of an operation monitoring / failure processing unit in the full-duplex data communication device shown in FIG. 1;

FIG. 4 is a sequence diagram showing an operation of the full-duplex data communication device shown in FIG.

FIG. 5 is a sequence diagram showing an operation of the full-duplex data communication device shown in FIG.

FIG. 6 is a block diagram illustrating a configuration of a conventional full-duplex data communication device.

[Explanation of symbols]

 1, 61 Communication device (transmission side) 2, 62 Communication device (reception side) 3a, 3b, 73a, 73b Full-duplex data transmission line 10a, 10b, 610, 620 Data processing unit 11, 611, 621 Transmission data editing process Unit 12, 612, 622 Transmission processing unit 13, 613, 623 Reception processing unit 14, 614, 624 Received data decryption processing unit 101 Operation monitoring / failure processing unit 102 Line switching processing unit 103a, 103b Switching unit 104 Return path 105 Database 106 Display processing unit

Claims (4)

(57) [Claims] The present invention has a loopback path for looping a line in its own device, and means for switching a line to the loopback path when a failure in a full-duplex data transmission system is detected, and determines whether a failure has occurred in its own device. The full duplex data that identifies whether the failure of its own device or the partner device
Data communication device that has status data
Output data, and based on the response status,
Detecting the possibility of failure of the
When the failure is identified, the fact is notified to the partner device.
And a notification using the status data . 2. The apparatus according to claim 1, further comprising means for outputting test data to the switched return path and detecting a faulty part in the own apparatus by tracking and verifying the flow of the processing. 2. The full-duplex data communication device according to 1. 3. A database preliminarily storing information for failure recovery for a failure content assumed for each part in the apparatus, and a failure for a failure content assumed from the database when a failure part is detected. 3. The information processing apparatus according to claim 2, further comprising means for searching for information for restoration, and displaying information indicating a detected failure site, information indicating the content of the failure, and information for restoring the failure. Full duplex data communication device. 4. The method according to claim 1, wherein the first and second parts are the same.
A full-duplex data transmission system comprising a double data communication device.