JPS63102428A - Fault division method in x21 terminal connection - Google Patents

Abstract

PURPOSE:To attain accurate and quick fault division in an X21 terminal connection by applying central control to the connection state test of a network between terminal equipments having a fault by means of a CPU and each connection test means. CONSTITUTION:Remote test equipments 15a, 15b receiving a command from a CPU 16 command the line disconnection from terminal equipments 11a, 11b and line lead to equipments 15a, 15b to line drawing devices 14a, 14b. When the line lead is finished, the network consists of the equipments 15a, 15b in place of the terminal equipments 11a, 11b. When the equipment 15a sends the dial number of the terminal equipment 11b in a procedure decided by the X21, the terminal equipment 11 receives it when the network is normal. Then the equipment 15a receives an acknowledge to discriminate that the network is normal. The equipment 15b applies the similar acknowledge. Since a fault exists at the terminal side, the faulty terminal equipment is discriminated by the transmission/reception of the equipments 15a,15b with their own terminal equipments 11a, 11b. The result is sent to the CPU 16, then the operator can divide a fault quickly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for increasing the efficiency of maintenance and speeding up fault identification of a circuit switched network to which X21 terminals are connected.

BACKGROUND ART FIG. 2 is a block diagram showing a conventional fault classification method.
1a1 lb are terminals each having an X21 interface, 2a and 2b are terminals 1a and 1b, respectively.
The line concentrators 3a, 3b, 3c for
4a and 4b are online monitors that monitor the lines of terminals 1a and 1b, respectively; 5 is a protocol that is connected to exchange 3a and monitors the network between terminals 1a and 1b; It is an analyzer.

In the above configuration, if a failure occurs in which the communication between the terminals 1a and 1b is poor and the line connection is not performed correctly, the data on the line of the terminals 1a or 1b is monitored by the online monitor 4a14b, etc. Check whether the data is being transmitted and received correctly, and also check if the cause of the failure is the network or switch 3a.

Fault classification is performed by determining whether the fault is on the terminals 3b and 3c or on the terminals 1a and 1b.

Furthermore, if it is difficult to classify the fault using the above method, a pseudo terminal such as a protocol analyzer 5 is connected to the exchange 3a, etc., and connection control is performed between this pseudo terminal and the terminals 1a and 1b.

Problems to be Solved by the Invention However, in the method for the former fault classification described above, if the connection between terminals 1a and Ib is poor, terminal 1a
It is impossible to determine the cause of the failure by monitoring only the line data of one terminal 1a or 1b, and the connection control only between the pseudo terminal and one terminal 1a or 1b in the latter method is also insufficient. Therefore, a connection test with both terminals 1a and 1b must be performed, and if a large number of terminals are located in remote locations, there is a problem in that a large number of maintenance workers are required.

Incidentally, in order to improve the former method, a method is known in which the line data of both terminals 1a and 1b are monitored simultaneously.
When the terminals 1a and Ib are located at a long distance, synchronization is difficult, and similarly, when a large number of terminals are located at remote locations, there is a problem that many maintenance workers are required.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a method that can accurately and quickly classify faults in X21 terminal connections.・Means for solving the problems In order to solve the above problems, the present invention has
1 interface, and connects a means for drawing a line to a line between a plurality of terminals forming a network and the line concentrator,
connecting a means for controlling each of the line lead-in means and performing a connection test of the network, connecting a central processing unit to the connection test means, and drawing lines of two terminals to be tested to the connection test means; A network connection status test is centrally controlled by the central processing unit and the connection test means.

The present invention uses the method described above to centrally control the network connection status test between terminals in which a fault has occurred using the central processing unit and the respective connection test means. It is possible to accurately and quickly determine whether the switch is on the exchange side or not.

EXAMPLES Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram for explaining a fault classification method in X21 terminal connection according to the present invention.

In FIG. 1, 11a and 11b each have an X21 interface, and terminals used by users, i2a,
12b are respectively the terminals 11a and 11b's line concentrators, 13a and 13b% 13C are the exchanges that connect the terminals 11a and llb, respectively, 14a and 14b
are terminals 11a, llb and line concentrator 12a, respectively.
12b(7) line connecting device for connecting the line between
15a and 15b are respectively line introduction devices 14a.
, 14b for testing the connection status between the terminals 11a and llb; 16 is connected to the remote testing devices 15a and 15b via telephone lines and packet lines for disconnecting faults in the wire mesh body; This is a central processing unit (CPU) that centrally controls the division.

Next, the operation of the embodiment according to the above configuration will be explained.

When a failure occurs between the terminals 11a and 11b, when the maintenance worker instructs the CPU 15 to perform a test point and connection check on the terminals 11a and 11b, the CPU 16
Each terminal 11a is connected via a telephone line or a packet line.
The remote testing device 15a on the side and the remote testing device 15b on the terminal 11b side are instructed to execute the test.

Remote testing devices 15a, 15b instructed to execute the test
are for the line introduction devices 14a and 14b, respectively.
(Dotted lines shown to separate the lines from terminals 11a and llb)
and instructs to connect the line to the remote testing devices 15a and 15b (solid line shown). Line introduction devices 14a, 14b
When each of the terminals 11311 and 1131 completes the line installation instructed by the remote testing devices 15a and 15b, the network connects the terminals 11311
1b are replaced by remote testing devices 15a, 15b, respectively.
The configuration is such that they are connected.

In the above network configuration, for example, when the remote testing device 15a on the terminal 11a side acts as a pseudo terminal device and sends out the dial number of the terminal 11b in accordance with the procedure defined in X21,
The b-side remote testing device 15b receives the calling signal (BEL) if the network is normal.

When the remote testing device 15b receives the calling signal (BEL) and responds to the incoming call, the remote testing device 1 on the terminal 11a side
5a receives the incoming call response, enables communication between both devices 153 and 15b, and can determine that the network is normal.

Similarly, the remote testing device 15b on the terminal 11b side can confirm that the network is normal by receiving the calling signal (BEL).

Therefore, the failure is not on the network side, but on the terminal 11a or I
It can be determined that the remote testing devices 15a and 15b are on the lb side, and furthermore, the remote testing devices 15a and 15b are connected to their own terminals 11a and 15b, respectively.
Is it possible that the failure is on the terminal 11a side by transmitting and receiving with Ilb?
It is possible to determine whether it is the Ilb side.

On the other hand, if the network is not normal, the remote testing device 15a,
15b is an incoming call response and a calling signal (BEL), respectively.
), it can be determined that the network is not normal.

The network connection test results determined by the remote testing devices f15a and 15b are sent to the CPU 16 via the telephone line and packet line, respectively, so that the maintenance worker can
Test results from the remote test devices 15a and 15b can be received and received via the PU 16, and network failures can be isolated by remote control.

For the sake of explanation, the above embodiment shows a case in which a network between two terminals 11a and Ilb is tested, but for example, it is also possible to connect the above-mentioned line installation device and remote testing device to each of a large number of terminals located throughout the country. For example, a single CPU can test a network having a large number of terminals, and therefore does not require a large number of maintenance workers.

As described in detail, the present invention centrally controls the network connection status test between terminals in which a fault has occurred using a central processing unit and each connection test means, so that it is possible to centrally control network connection status tests between terminals in which a fault has occurred. It is possible to accurately and quickly distinguish whether the information is on the network or exchange side.

[Brief explanation of the drawing]

FIG. 1 is a block diagram for explaining a fault classification method in X21 terminal connection according to the present invention, and FIG. 2 is a block diagram for explaining a conventional example. 113 11b=terminal, 12a 12b...concentrator, 13a, 13b, 13C--exchange, 14a,
14b... line lead-in device, 15a, 15b.
・・Remote testing equipment, 16 ・・Central processing unit (CPU
).

Claims (1)

[Claims] Each has an X21 interface, connects a means for drawing a line to a line between a plurality of terminals constituting a network and the line concentrator, and connects a means for controlling each of the line drawing means and performing a connection test of the network. A central processing unit is connected to the connection test means, and the second
1. A fault isolation method in an X21 terminal connection, characterized in that lines of two terminals are connected to the connection testing means, and a network connection status test is centrally controlled by the central processing unit and the connection testing means.