JPS63304744A - Fault diagnostic system - Google Patents

Abstract

PURPOSE:To attain the location of a faulty point by using information representing the disabled collection of fault information as the fault information when no fault information can be collected. CONSTITUTION:A center 100 applies transmission/reception of a command to multiplexers 101,102 being destinations to set the connection at first and the fault information can be collected after the end of the setting of the connection. When the fault information is collected normally, the fault location is located based on the information. If no fault information can be collected conversely, it is considered that a fault takes place at the setting of connection or at the collection of fault information after that, and it is recognized by the center 100 in a form of timeout of a reply monitor time of each level. Thus, if no fault information can he collected, the fault location is located based on the result of combination of timeouts detected by the center 100.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fault diagnosis method, and particularly to a fault diagnosis method suitable for fault diagnosis in fault situations where it is difficult to collect fault information.

[Conventional technology]

Traditionally, network management has mainly focused on modem networks, but as the use of high-speed digital lines increases, the management of networks consisting of multimedia multiplexing equipment has become important. ing. The functions required of a management system for a multimedia multiplexing device are discussed, for example, in "Nikkei Communication" (July 7, 1986 issue, pages 101-103). Here, display function, system configuration function.

Channel configuration function 2 line configuration change function, route configuration function,
It mainly provides an overview of the W reporting function, monitoring function, and diagnostic function.

[Problem that the invention seeks to solve]

Conventionally, fault diagnosis, which is one of the fault management functions described above, has been carried out by reporting via an interrupt from each multimedia multiplexing device (hereinafter simply referred to as a "multiplexing device"), or by reporting from a network management center. (hereinafter simply referred to as the "center"), the fault location has been isolated based on fault information collected by polling the multiplexing device.

However, a characteristic of information networks is that data and fault information pass through the same network, so depending on the fault, it may not be possible to collect fault information, and in this case, there is a problem in that it becomes difficult to isolate the fault location. .

The present invention has been made in view of the above circumstances, and its purpose is to solve the above-mentioned problems in conventional fault diagnosis methods, and collect fault information by polling from a center to each multiplexing device. In an information network, when failure information cannot be collected, information indicating that the failure information cannot be collected is used as failure information.
The object of the present invention is to provide a fault diagnosis method that makes it possible to isolate the faulty part.

[Means for solving problems]

The above-mentioned object of the present invention is that the present invention is composed of a center, a plurality of communication nodes managed by the center, and a plurality of communication lines connecting these, and that network management information is collected by polling from the center to each of the communication nodes. information collected by the polling in the information network.

This is achieved by a fault diagnosis method characterized by isolating the fault location in a fault situation that occurs in a network based on fault information indicating that fault information cannot be collected.

[Effect]

In the present invention, the center sequentially transmits polling messages to the multiplexing devices constituting the network to be managed, and collects fault information accumulated in each multiplexing device. At this time, the center communicates with the destination multiplexer,
First, commands for setting up a connection are sent and received, and after the connection setting is completed, failure information can be collected. Therefore, if fault information is successfully collected, the fault location can be isolated based on that information.

On the other hand, if fault information cannot be collected, it is likely that a fault has occurred during connection setup as described above or during subsequent fault information collection, and these may occur at the center in the form of response monitoring timeouts at each level. will be recognized. Therefore, if fault information cannot be collected, the fault location can be isolated based on the combination of these timeouts detected at the center.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 shows the basic configuration of a network consisting of multiplexing devices showing one embodiment of the present invention. In the figure, 10
0 is a center, 101 and 102 are multiplexing devices.

104 and 105 are remote control adapters (hereinafter referred to as "adapters"), and 103 is a high-speed digital line.

The center 100 polls the multiplexing devices 101 and 102 in turn and collects failure information as response data. Here, the fault information is automatically collected by the multiplexing device regarding the status of the main unit, the high-speed digital line connected thereto, and the subscriber line. In polling, first, a logical 1-ranspout 1-connection is established between the center 100 and the polling destination multiplexing device, for example, the adapter 105 of the multiplexing device 102. Here, the adapters 104 and 105 constitute a management information network.

As shown in FIG. 3, when the center 100 sends the 1-transport connection setting command 106, it starts monitoring the time for a response 107 from the adapter 105. Upon receiving the command 106, the adapter 105 returns a response 107 to the center 00, and also sends a polling message 108 added to the transport connection setting command 106 to the multiplexer 102.The multiplexer 102 , returns the fault information message 109 as a response.When the center 100 receives the response +07, it cancels the time monitoring and starts a new time monitoring of the fault information message 109.Then, when the center 100 receives the fault information message 109, the time has elapsed for 1 hour. Monitoring will be canceled and trouble diagnosis will begin.

For example, assuming that a failure has occurred in the high-speed digital line 103, a retryer 1- occurs at the data link level between the adapter 104 and ]05, and the transport connection setting command 106 does not arrive at the remote control adapter 105. It turns out. Therefore, response 1
07 is of course not returned to the center 100, so response 1
07 time monitoring will time out. This timeout is the management network retryout (hereinafter referred to as "management network R").
It is called OJ).

In addition, in the connection tryout at the data link level between the adapters 104 and 105, the response 110 at the data link level is not returned to the adapter 104, so the adapter 10
4 and is detected by the center by report message 111.
100 reported. This is called a data link retryout (hereinafter referred to as "data link ROJ"). Therefore, if a failure occurs in the high-speed digital line 103, failure information cannot be collected from the multiplexer 102, but the failure information can be collected from the adapter 104. Since the data link RO and the management network RO to the adapter 105 can be detected,
It can be determined that the faulty part is the high-speed digital line 103.

Next, if a failure occurs in the main body of the multiplexing bag @102, the polling message 108 is sent to the multiplexing device 102.
2, so of course failure information message 109 is sent.
will not be returned to the center 100. Therefore, the time monitoring of the failure information message 109 will time out. This timeout is called an application timeout (hereinafter referred to as "AP timeout"). In this case, data link RO and management network RO do not occur, and only AP timeout occurs, so it can be determined that the multiplexing device 102 is the faulty part.

As described above, failure diagnosis can be performed by using failure information that is automatically collected by the multiplexing device as failure information that cannot be collected at the center. The details of the processing of the center 100 will be explained below.

Each step will be explained according to the flowchart in FIG.

Step 200: Select a multiplexer to send the polling message.

Step 210: Send a polling message to the selected multiplexer.

Step 220: Determine whether failure information from the multiplexing device has been collected.

Step 230: Now that the fault information has been collected, fault isolation is performed based on that information.

Step 24o: Since failure information could not be collected, check whether a data link level raw report has been received.Step 250: If a report of data link RO occurrence has been received, check the occurrence of management network RO. Confirm that it is detected.

Step 260: In this case, it is determined that the faulty part is the high-speed digital line.

Step 270: If no report of the occurrence of data link RO has been received, check whether the occurrence of management network RO has been detected.

Step 280: If the occurrence of management network RO is detected.

The faulty part is determined to be the adapter.

Step 290: If the occurrence of management network RO is not detected, confirm that AP timeout is detected.

Step 300: In this case, it is determined that the faulty part is the multiplexing device.

Next, a specific configuration example will be explained using FIG. 4. Fourth
The figure shows an example of the configuration of a network 1 to a network composed of multiplexing devices. In the figure, 100 is the center, 4, , 6.1
0.14 is a multiplexing device, 2, 7.11.15 is the adapter, 5, 9.13.17 is a high-speed digital line,
18 and 19 are control lines connecting the multiplexer 4 and the adapter 2 (corresponding to high-speed digital lines 5 and 9, respectively), 20
゜21 is a control line (
(corresponding to high-speed digital lines 5 and 17, respectively), 22
゜23 is a control line connecting the multiplexer 10 and the adapter 11 (corresponding to high-speed digital circuits IIA9 and 13, respectively)
, 24°z5 are control lines that connect the multiplexer 14 and the adapter 15 (corresponding to high-speed and high-speed digital lines 17 and 13, respectively), and 1°3 are communication lines that connect the center 100, the multiplexer 4, and the adapter 2, respectively. line, also 8, 12
．． 16 indicates communication lines connecting the multiplexing devices 6, 10.14 and the adapters 7.11.15, respectively.

Computers and the like are connected to the subscriber line side of each multiplexer and communicate with each other, and data is exchanged between the multiplexers via high-speed digital lines 5, 9, 13, and 17. . The adapters 2, 7, 11, and 15 constitute a management information network through which the center 100 collects fault information of the multiplexer bodies 4, 6, 10, and 14 and the high-speed digital lines connected thereto by polling. It is a packet switch. When polling each multiplexing device from the center 100, the routes through which polling messages are sent are: when polling the multiplexing device 4 directly connected to the center 100, and when polling the remote multiplexing device 6. I will explain about it.

First, the multiplexer 4 directly connected to the center 100
When polling is performed, the polling message first enters adapter 2. The network management function of adapter 2 uses the destination address in the polling message to
It recognizes that the destination is the multiplexer 4 and sends a polling message to the communication line 3. Upon receiving the polling message, the multiplexer 4 creates response data,
Send to communication line 3. The response data from the multiplexer 4 is returned to the center 100 through the reverse route.

Next, when polling the remote multiplexing device 6, the polling message first enters the adapter 2, and the network management function of the adapter 2
It recognizes from the address in the polling message that the destination is not the multiplexer 4, and sends the polling message to the control line 18 according to the routing information in the polling message. Multiplexer i! The message received at 4 is sent to the high-speed digital line 5 corresponding to the control line 18 and input to the multiplexer 6. Further, the signal is sent from the multiplexer 6 to the adapter 7 via a control line 20 corresponding to the high-speed digital line 5. Since the destination is the multiplexing device 6, the network management function of the adapter 7 sends a polling message to the communication line 8. When multiplexer 6 receives the polling message, it creates response data and sends it to communication line 8. The sent response data reaches the center 100 by following the reverse route.

Next, the status word, which is response data to polling, will be explained using the configuration diagram of the multiplexing device 26 shown in FIG.

Data from the subscriber line side is taken into the multiplexer 26 via the subscriber line side interface 28, and transferred by the control unit 29 to the corresponding high speed digital line via the high speed digital line side interface 27. Ru. Further, data from the high-speed digital line side is sent to the multiplexer 26 via the high-speed digital line side interface 27.
The data is taken in by the controller 29 and transferred to the corresponding subscriber line via the subscriber side interface 28. The status of the control unit 29 is checked periodically by the monitoring unit 30.
It is monitored by the signal sent from 9. The high-speed digital line status is high-speed digital line side interface 2.
The control unit 29 monitors the data sent through the controller 7 to check the data.

When an abnormality is recognized in the control unit 29 or the high-speed digital line, the control unit 29 immediately switches to the backup system, and in the case of a single line failure, monitors the line status at a certain sampling interval, and detects network failures, clock cycle deviations, etc. The frequency of occurrence is recorded in memory along with the number of sampling times.

When a failure in the control unit 29 or a line failure occurs, the status word creation unit 31 generates a status word 3 as shown in FIG.
It is set at regular intervals in the form of 2.

In FIG. 6, 33 indicates multiplexing'! Network address at location A, 34 is a failure information presence/absence display flag, 35 is the number of sampling times, 36 is the number of network failures, 37 is the number of clock cycle deviations, 38 is the number of frame synchronization failures, 39 is network failure, clock cycle 40 indicates a memory failure (control unit 29) flag, 41 indicates a CPU failure (control unit 29) flag, and 42 indicates a monitoring unit (30) failure flag. . Note that the items from the number of network failure occurrences, 36, to the number of frame synchronization errors, 39, exist for the maximum number of high-speed digital lines that can be connected to the multiplexer (four lines in this embodiment).

The status word is set in the memory and sent back to the center 10G as response data when a polling message from the center 100 mentioned above is received. The center 100 identifies the location of the fault based on the above-mentioned aggregated fault information and instantaneous values.

7 and 8 are diagrams showing the results of fault isolation based on the responses obtained when polling the multiplexer, and FIG. 7 shows the result of polling the multiplexer 4 directly connected to the center 100. In this case, FIG. 8 shows the case where the (remote) multiplexer 14 that is not directly connected to the center 100 is polled.6 In either case, if the status word that is failure information cannot be received , AP timeout, management network R○
Alternatively, data link R○ will be detected. first,
When polling the multiplexing device 4 directly connected to the center 100 shown in FIG. 7, for example, when only an AP timeout is detected, the faulty part is the communication line 3 or the multiplexing device 4. This means that only AP timeouts are detected, which means that center 100 and adapter 2
1-Transport connection is set up between 1 and 2, but the status word from multiplexer 4 is
This indicates that the error does not reach 0, and the communication line 3 or the multiplexer 4 is considered to be the faulty part.

Similarly, the multiplexing device 14 that is not directly connected to the center 100 shown in FIG.
This shows that it is possible to identify the damaged area.

As described above, according to this embodiment, if the status word, which is fault information, can be collected from the multiplexing device, fault diagnosis is performed based on the fault information, and if the status word cannot be collected, the center 100 Fault diagnosis can be performed by using the response monitoring timeout detection function of each layer of the management information transfer protocol between multiplexing devices.

Note that the above embodiment is explained as an example, and
It goes without saying that the present invention should not be limited to this.

〔Effect of the invention〕

As described above, the present invention includes a network management center, a plurality of communication nodes managed by the network management center, and a plurality of communication lines connecting these nodes, and network management information is transmitted from the network management center to each of the communication nodes. Information collected by polling communication nodes In the network, information collected by polling.

Based on the failure information that the failure information cannot be collected, the failure part in the failure situation that occurs in the network is isolated, so even if the failure information cannot be collected, the failure information that the failure information cannot be collected is By using this information as information, it has the remarkable effect of realizing a fault diagnosis method that makes it possible to isolate the faulty part.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing the operation of a network management center according to an embodiment of the present invention, FIG. 2 is a basic configuration diagram of a network according to the embodiment, and FIG. 3 is a flowchart showing management information between the management center and a multiplexing device. FIG. 4 is a diagram showing an example of the configuration of a network according to the embodiment; FIG. 5 is a diagram showing an example of the configuration of a multiplexing device; FIG. 6 is a format diagram of a status word; FIG. FIG. 8 is a diagram showing the result of failure isolation based on the response obtained when polling the multiplexing device. 100: Center, 4, 6.10, 14, 101, 10
2: Multiplexing group 'If! , 2 , 7.11, 15, 1
04,105: 7 adapter, 5,9,13°17.1
03: High-speed digital line, 32: Status word. Figure 2 Figure 5 Figure 7 Figure 8

Claims (1)

[Claims] 1. Consists of a network management center, a plurality of communication nodes managed by the network management center, and a plurality of communication lines connecting these, and network management information is collected by polling from the network management center to each communication node. A fault diagnosis method in an information network, characterized in that a fault location in a fault situation occurring in a network is isolated based on information collected by the polling and fault information indicating that fault information cannot be collected.