JPH01202952A - Line test system - Google Patents

Abstract

PURPOSE:To save number of personnels for fault location by inserting three or over of nodes such as the 1st, 2nd and 3rd nodes to a ring transmission line and varying a time slot address of the 1st node externally. CONSTITUTION:When a fault takes place while terminal equipments 7, 9 are under communication, a maintenance personnel visits a node 2 to which a tester 5 is connected, and the time slot address of the node 2 is used as a time slot address applying communication between the terminal equipment 7 and the said terminal equipment 9, and a data is sent from the tester 5. Then the maintenance personnel of the node 2 communicates with the maintenance personnel of the monitor 1, and the tester 5 compares the reception data and transmission data corresponding thereto. In this case, when a line set 6 of the node 3 is faulty, the signal is set through the line set 6, a fault takes place in the reception data of the test 5, and when a line set 8 of the node 4 is faulty, the signal is set through the line set 8, then a fault takes place in the reception data of the test 5 and the fault of the line set is detected.

Description

[Detailed Description of the Invention] [Summary] A time division multiplexed ring-shaped local network (hereinafter referred to as LAN) in which a monitoring device and three or more nodes connecting terminals are inserted into a ring-shaped transmission path. ), with the aim of providing a line testing method that requires fewer maintenance personnel and can isolate faults, a tester that can compare transmitted data and received data is connected to the first node. , when a failure occurs during communication between the first terminal connected via the line set of the second node and the second terminal connected via the line set of the third node, The tester transmits data using the time slot address of the first node as the time slot address used for communication between the first terminal and the second terminal, and the monitoring device sequentially transmits the data. , the second node is configured such that the transmitted data passes through the line center without being sent to the first terminal, then the second node is configured so that the transmitted data passes through the line center without passing through the line center, and then, The third node is also set in the same manner as above, and the tester is configured to compare the received data corresponding to each setting with the transmitted data to isolate the location of the failure.

[Industrial application field]

The present invention provides a method for detecting when a line failure occurs in a time-division multiplexed ring-shaped LAN in which three or more nodes connecting a monitoring device and a terminal are inserted into a ring-shaped transmission path.
This paper relates to a line testing method for isolating the location of a fault.

Note that ring-shaped transmission lines are normally designed to switch over to a backup line if there is a failure in the working transmission line, and failures in the transmission line usually do not pose a problem. The problem shall be determined whether it is a failure of the terminal or the failure of the terminal.

[Conventional technology]

A conventional example will be explained below using figures.

FIG. 4 is a block diagram of a conventional ring-shaped LAN,
2°, 3.4.10 are nodes, 6, 8° 11 are line sets, 7, 9.12 are terminals, there are 4 nodes, terminal 7 connected to node 3, and terminal 7 connected to node 4. Assuming that a failure has occurred while the terminal 9 is communicating, how to isolate the failure will be explained below.

In this case, a maintenance person goes to nodes 3 and 4, respectively, and terminals 7. In place of the terminal 9, a modem tester 5-1, 5-2 which can perform a test by comparing transmitted data and received data is connected, and data is first transmitted from the modem tester 5-2 connected to the node 4.

At that time, another maintenance person checks the network service processor (hereinafter N) of the monitoring device 1 that is monitoring the system status.
(referred to as SP) 13, sequentially through the monitoring unit 1-1.
The node 3 is set so that the data sent from the modem tester 5-2 is not sent to the modem tester 5-1 but passes through the line set 6, and then the data sent from the modem tester 5-2 is set so that it passes through the line set 6 instead of being sent to the modem tester 5-1. The received data for each setting is compared with the transmitted data.

Next, the Bunjin maintainer sends data from the modem tester 5-1, and the data sent from the modem tester 5-1 is sent to the node 4 sequentially from the N5P13 via the monitoring device 1. The modem tester 5-1 compares the received data with the transmitted data for each setting.

In this case, if line set 6 of node 3 is faulty, modem tester 5-2
If an abnormality occurs in the received data of node 4, and line set 8 of node 4 has a failure, when setting to pass through line set 8,
An abnormality occurs in the data received by the modem tester 5-1, and a fault in the line center can be detected.

In any of the above settings, if there is no abnormality in the data received by the modem testers 5-1 and 5-2, it can be determined that either the terminal 7 or the terminal 9 is at fault.

[Problem to be solved by the invention]

However, with the test method for isolating the above-mentioned failures,
A maintenance person has to go to two nodes that accommodate terminals that are communicating, and three maintenance people are required to perform each setting compared to N5P13, resulting in a problem of poor work efficiency.

The present invention aims to provide a line testing method that requires fewer maintenance personnel and can isolate faults.

[Means to solve the problem]

FIG. 1 is a block diagram of the principle of the present invention.

As shown in FIG. 1, there are nodes 2 and 2 that connect a monitoring device 1 and a terminal via a line set to a ring-shaped transmission path. Node 3. In a time division multiplexed ring-shaped local network in which three or more nodes 4 are inserted, a tester 5 is provided that can change the time slot address of the node 2 from the outside and can compare transmitted data and received data. If a failure occurs during communication between the terminal 7 connected via the line set 6 of the node 3 and the terminal 9 connected via the line set 8 of the node 4, Let the time slot address of the node 2 be the time slot address at which the terminal 7 and the terminal 9 were communicating.

Then, the tester 5 transmits the data, and the monitoring device 1 sequentially checks the node 3 with the transmitted data.
Set it so that it is not sent to the terminal 7 but passes through the line set 6,
Next, set the node 4 so that the transmitted data does not pass through the terminal 9 and pass through the line set 8, and then set the node 4 so that the transmitted data does not pass through the terminal 9 but passes through the line set 8. The line set 8 is also set to pass through, and the tester 5 compares the received data corresponding to each setting with the transmitted data to isolate the fault location.

[For production]

According to the present invention, when a failure occurs during communication between the terminal 7 and the terminal 9, a maintenance person goes to the node 2 to which the tester 5 is connected, and inputs the time slot address of the node 2 between the terminal 7 and the terminal 9. The time slot address used for communication between the terminals 9 is used, and data is transmitted from the tester 5.

In addition, the maintenance person at the monitoring device 1 sequentially performs the following operations on the monitoring device 1.
The node 3 is set so that the transmitted data passes through the line set 6 without being sent to the terminal 7, then the node 3 is set so that the transmitted data does not pass through the line set 6 either, and then the node 4 is set so that the transmitted data is not sent to the terminal 9 but passes through line set 8, and then set so that it passes through line set 8 as well.

The maintenance person at the node 2 contacts the maintenance person at the monitoring device 1, and uses the tester 5 to compare the received data and the transmitted data corresponding to each setting.

In this case, if line set 6 of node 3 is a failure, an error occurs in the received data of tester 5 when it is set to pass through line set 6, and if line set 8 of node 4 is a failure, it is set to pass through line set 8. When set, an abnormality occurs in the data received by the tester 5, and a fault in the line set can be detected.

In the case of all settings, if there is no abnormality in the data received by the tester 5, it can be determined that the terminal 7 or the terminal 9 is at fault.

In other words, in this case, only two maintenance personnel are required; however, if the node 2 to which the tester 5 is connected is located at the location where the monitoring device 1 is located, even one maintenance personnel can perform the above troubleshooting. can be reduced.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 2 is a block diagram of a ring-shaped LAN according to an embodiment of the present invention, and FIG. 3 is a block diagram mainly showing a line center according to an embodiment of the present invention.

In Figure 2, as in Figure 4, there are 4 nodes,
As will be explained later, the time slot address of the node 2 can be changed externally, and the time slot address of the node 2 can be changed from the outside via the line set 14. It is assumed that the terminal 7 connected to the node 3 and the terminal 9 connected to the node 4 are connected, and the failure occurs during communication between the terminal 7 connected to the node 3 and the terminal 9 connected to the node 4. This will be explained below.

When a failure occurs, the maintenance person goes to node 2 and sets the time slot address of node 2 to the time slot address on which the transmitted data of terminal 5, which was communicating between terminal 7 and terminal 9, is carried. A communication path with the node 4 is set up, and then a time slot address is set to carry the transmission data of the terminal 9, and a communication path with the node 3 is set up.

This address setting will be explained using FIG. 3.

For example, when setting a time slot address on which the transmission data of the terminal F is to be placed, the time slot address on which the transmission data of the terminal F is to be placed is set in the external control device 15.

Then, the microprocessor unit 17 reads the set time slot address via the interface 16 and sets it in the register 18.

The comparator 19 compares the set address with the address extracted from the transmission path by the time slot address extractor 23 of the node 2, and when the set address is reached, the gates 20 and 21 are opened. The modem tester 5 transmits transmission data or receives transmitted data via the time slot of this address.

When setting the time slot address for transmitting data from the terminal 9, it is done in the same manner as above.

Here, instead of setting the time slot address to the external control circuit 15, it is of course possible to set it using a switch or the like.

To explain the setting of the time slot address when performing normal communication between terminals, the time slot address is sent from the N5P13, which monitors the LAN status, via the monitoring unit 1-1.
The time slot address of the transmitting side and the receiving side is received by the time slot address setting unit 22 of the node, this address is set in the register 18, and the address extracted by the time slot address extracting unit 23 is set as the address of the transmitting side. If so, the gate 20 is opened, and if the address is the receiving side, the gate 21 is opened.

In this way, first, the maintenance person sets the time slot address of node 2 to the time slot address on which the transmission data of the terminal is to be carried, and sets up a communication path with node 4.

The maintenance person at the monitoring device 1 uses N5P13 to check the monitoring unit 1-
1, the line set 6 to which the terminal 7 is connected is closed (communication stopped) 1, so that data is not transmitted from the terminal 7 to the transmission path and interference with data from the modem tester 5 is prevented.

Then, in N5P13, via the monitoring unit 1-1, the data transmitted from the modem tester 5 is sent to the node 4 through the line set 8 without being sent to the terminal 9, and then the data transmitted through the line set 8 is also passed through. Set it to do so.

At this time, the maintenance person at the node 2 contacts the maintenance person at the monitoring device 1, and uses the modem tester 5 to compare the received data and the transmitted data for each setting.

If line set 8 is in trouble, the received data will be abnormal when it is set to pass through it, so line set 8
can be detected as a failure.

Next, the maintenance person sets the time slot address of node 2 to the time slot address on which the transmission data from terminal 9 is to be carried, and sets up a communication path with node 3.

The maintenance person at the monitoring device 1 uses N5P13 to check the monitoring unit 1-
1, the line set 8 to which the terminal 9 is connected is closed (communication stop) 1, and data is not transmitted from the terminal 9 to the transmission line to prevent interference with data from the modem tester 5.

Then, in N5P13, via the monitoring unit 1-1, the data transmitted from the modem tester 5 is set to pass through the line set 6 without being sent to the terminal 7, and then the data transmitted through the line set 6 is passed through the node 3 without being sent to the terminal 7. Set it to do so.

At this time, the maintenance person at the node 2 contacts the maintenance person at the monitoring device 1, and uses the modem tester 5 to compare the received data and the transmitted data for each setting.

If line set 6 is in trouble, the received data will be abnormal when it is set to pass through it, so line set 6
can be detected as a failure.

In all settings, if there is no abnormality in the received data, it can be determined that terminal 7 or 9 is at fault.

That is, two maintenance personnel are required, one at the location where the monitoring device 1 is located and the other at the location where the node 2 is located, and only one maintenance person is required if the node 2 is located at the location where the monitoring device 1 is located.

Therefore, the number of maintenance personnel can be reduced and work efficiency can be improved.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to reduce the number of maintenance personnel required to isolate faults, and the work efficiency can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the principle of the present invention. FIG. 2 is a block diagram of a ring-shaped LAN according to an embodiment of the present invention. FIG. 3 is a block diagram mainly consisting of a line set according to an embodiment of the present invention. 1 is a block diagram of a conventional ring-shaped LAN. In the figure, ① is a monitoring device, 1-1 is a monitoring unit, 2.3, 4. 10 is a node; 5 is a tester; 5-1.5-2 is a modem tester; 6.8.11 is a line center; 7.9.12 is a terminal; 13 is a network service processor. 1000 Silk Four Principles Brosov Boatman (Kuni Jyokuzorou's Fuhoumi 4 Dari no 1 Ruff" 4jj tJ/'s BuO Nof Picture Broom 2 Mouths

Claims (1)

[Claims] A first node (2) is a node that connects a monitoring device (1) and a terminal to a ring-shaped transmission path via a line set.
, a second node (3), and a third node (4), in a time division multiplexed ring-shaped local network, the time slot address of the first node (2) is externally inserted. A tester (5) that can be made more variable and can compare transmitted data and received data is connected, and the line set (6) of the second node (3) is connected.
a first terminal (7) connected via a line set (8) of the third node (4);
When a failure occurs during communication with the first node (9), the time slot address of the first node (2) is transferred to the first node (9).
The tester (5) transmits data as the time slot address used for communication between the terminal (7) and the second terminal (9), and the monitoring device (1) sequentially checks the A second node (3) is configured such that the transmitted data does not go to the first terminal (7) but passes through the line set (6), and then the transmitted data does not pass through the line set (6) either. and then setting the third node (4) such that the transmitted data is not sent to the second terminal (9) but passes through the line set (8); Next is the line set (8)
With the tester (5),
A line testing method characterized by comparing the received data corresponding to each setting with the transmitted data to isolate the fault location.