JPH0221747A - Network failure diagnosis device - Google Patents

Abstract

PURPOSE:To quicken the fault recovery of the network by sending fault information to a normal transmission line when a fault is detected and estimating a fault location of the network depending on the received fault information. CONSTITUTION:A right-handed transmission line 4, a right-handed transmission line control means 6 sending-receiving a data on a left-handed transmission line 5 respectively, a left-handed transmission line control means 7 and a fault detection means 8a detecting a fault of a signal of an internal circuit of the right-handed transmission line control means 6 and the left-handed transmission line control means 7 are provided on the title device. Moreover, a means 9 sending fault information to a normal transmission line when a fault detection means 8a detects a fault and estimating a fault location of the network by the received fault information is provided. Since not only a detection signal is outputted simply but also the fault location of the network is estimated, the fault recovery of the network is quickened.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a network failure diagnosis device for diagnosing failures in digital communication networks and the like.

Conventional Technology In recent years, this type of network fault diagnosis equipment has come to respond to digital communication networks that are becoming larger and more complex, by not only detecting the presence or absence of a fault, but also detecting and notifying the location of the fault. .

FIG. 3 shows a loop-type digital communication network in which node devices 1, 2, and 3 each have a clockwise transmission path 4 where data is transmitted clockwise and a clockwise transmission path 4 where data is transmitted counterclockwise. They are connected via a counterclockwise transmission line 5.

FIG. 4 shows a node device equipped with a conventional network fault diagnosis device, in which 6.7 reads data on the clockwise transmission path 4 and counterclockwise transmission path 5, and adds data to be transmitted. A clockwise transmission line control device, a counterclockwise transmission line control device, 8 is a clockwise transmission line control device 6, which outputs onto the clockwise transmission line 4 and the counterclockwise transmission line 5, and sends out to the next adjacent node device.
This is a failure detection device that observes the state of the main points in the internal circuit of the counterclockwise transmission path control device 7, and when an abnormality is detected, outputs a failure detection signal and displays it.

In the above conventional example, if the clockwise transmission line control device 6 of the node device 1 fails and does not transmit data to the next node device 2, for example, the failure detection device 8 of the node device 1 Detect failure.

Further, since data is not transmitted from the clockwise transmission path 4 to the next node device 2, the failure diagnosis device 8 of the node device 2 detects this, and the clockwise transmission path control device 6 of the node device 2 detects this. data cannot be transmitted to the node device 3.

Similarly, since data is not transmitted from the clockwise transmission path 4 to the next node device 3, the failure detection device 8 of the node device 3
detects this.

Therefore, in the node device 1, an abnormality in the clockwise transmission line control device 6 is detected by its failure detection device 8, and in the node device 2.3, an abnormality in the received data signal is detected by each failure detection device 8.

Problems to be Solved by the Invention However, in the conventional network fault diagnosis device described above, the fault detection devices provided in each of the node devices 1, 2, and 3 only output a detection signal, so it is difficult to repair the fault location. In this case, it is necessary to consider how to limit the location of the fault in the network based on the plurality of fault detection signals from each fault detection device 8, resulting in a problem that recovery from the fault is delayed.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, it is an object of the present invention to provide a network failure diagnosis device that can quickly perform network failure recovery work.

Means for Solving the Problems In order to achieve the above object, the present invention transmits failure information to a normal transmission path when an abnormality is detected, and estimates the failure location of the network based on the received failure information. This is what I did.

Function: With the above-described configuration, the present invention not only outputs a detection signal but also estimates the location of a fault in the network, so that network fault recovery work can be carried out quickly.

EXAMPLES Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic block diagram showing a node device equipped with a network failure diagnosis device according to the present invention, and FIG. 2 is a schematic block diagram showing a loop-type digital communication network configured by the node devices shown in FIG. Components that are the same as those shown in FIGS. 3 and 4 are given the same reference numerals.

First, this digital communication network will be explained with reference to FIG. 2. 1a is a center node device (CN) that controls this mesh body, 2a and 3a are sott-t'tt, terminal devices and sub-networks. (all not shown) are connected to local node devices (LN-1, LN-2), and each node device 1a, 2a, 3a is connected to a clockwise transmission path 4 through which data is transmitted clockwise. , are connected via a counterclockwise transmission path 5 through which data is transmitted counterclockwise.

Returning to FIG. 1, the node devices 1a, 2a, and 3a read the data on the clockwise transmission path 4 and the left transmission path 5, respectively, add the data to be transmitted, and add the data to the clockwise transmission path 4 and the left transmission path 5. A clockwise transmission line control device 6, a counterclockwise transmission line control device 7, and a clockwise transmission line control device 6, a counterclockwise transmission line control device 7, which output onto the rotation transmission path 5 and send to the next adjacent node device. a fault detection device 8a for observing the state of main points in the internal circuit of the digital communication network and outputting a fault detection signal for display when an abnormality is detected; It is roughly composed of an estimation device 9.

Next, the operation of the above embodiment will be explained.

In FIGS. 1 and 2, for example, if the clockwise transmission line control device 6 of the local node device 3a fails and cannot send data, the failure detection device 8a of the local node device 3a detects the failure. The fault estimating device 9 notifies the other node devices 1a and 2a via the counterclockwise transmission path 5 that is not faulty.

Since the local node device 2a cannot transmit or receive data due to a failure in the clockwise transmission path 4, its failure detection device 8a detects an abnormality in the input signal of the clockwise transmission path 4 and sends an error to the failure estimation device 9. Notice.

In this case, the failure estimating device 9 of the local node device 2a has been notified of the failure information of the clockwise transmission path control device 6 of the local node device 3a, and therefore receives the failure notification from the failure detection device 8a. It is estimated that the clockwise transmission path control device 6 of the local node device 3a has failed, and the other node devices 1a and 3a are notified.

Furthermore, since the clockwise transmission path control device 6 of the local node device 3a has failed and cannot send data, the output signal of the clockwise transmission path 4 of the local node device 2a is the failure estimation information of the failure estimation device 9. Only.

In the center node device 1a, the reception signal from the clockwise transmission path 4 is abnormal due to the above reason, and since the failure information of the clockwise transmission path control device 6 of the local node device 3a has been notified, the failure is detected. When the detection device 8a detects an abnormality in the received signal from the clockwise transmission path 4 and notifies the failure estimation device 9, the failure estimation device 9 transmits this failure notification to the clockwise transmission path control device of the local node device 3a. 6 is estimated to have failed, and the other node devices 2a and 3a are notified.

Therefore, according to the above embodiment, each node device 1a,
In addition to a failure detection device 8a that detects a failure or abnormality inside the own node device, when the failure detection device 8a detects a failure or abnormality, the failure information is sent to the normal transmission path 4. Since the fault estimating device 9 is provided to estimate the cause of a fault based on the fault information sent to and received from the node equipment 1a, 2a, and 3a, it is possible to easily estimate the location of the fault in the network in each of the node devices 1a, 2a, and 3a.

As described in detail, the present invention provides, when an abnormality is detected,
Since failure information is sent to a normal transmission path and the location of the network failure is estimated based on the received failure information, network failure recovery work can be carried out quickly.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram showing a node device equipped with a network failure diagnosis device according to the present invention, and FIG. 2 is a schematic block diagram showing a loop-type digital communication network configured by the node devices shown in FIG. , FIG. 3 is a schematic block diagram showing a conventional digital communication network, and FIG. 4 is a schematic block diagram showing a node device equipped with a conventional network fault diagnosis device. 1a, 2a, 3a...Node device, 4...Clockwise transmission line, 5...Counterclockwise transmission line, 6...Clockwise transmission line control device, 7...Counterclockwise transmission line control device , 8a...
- Failure detection device, 9...Failure estimation device. Figure 1 Name of agent Patent attorney Shigetaka Awano and one other person

Claims (2)

[Claims] (1) Clockwise transmission line control means and counterclockwise transmission line control means that transmit and receive data on the clockwise transmission line and counterclockwise transmission line, respectively, and internal circuits of the clockwise transmission line control means and counterclockwise transmission line control means. fault detection means for detecting an abnormality in a signal of network fault diagnosis device. (2) The clockwise transmission path control means, the counterclockwise transmission path control means, the failure detection means, and the failure location estimation means are provided in a plurality of node devices connected to the clockwise transmission path and the counterclockwise transmission path, respectively. The network fault diagnosis device according to claim 1, characterized in that: