JPH02260838A - Maintenance test system - Google Patents

Abstract

PURPOSE:To facilitate the distinguishing of an equipment fault from a line fault and to eliminate the need for the provision of a monitoring line by testing a repeater remotely. CONSTITUTION:In the case of testing a repeater 2, a maintenance test equipment 1 sends a code inherent in the repeater 2 from a code transmitter 11. When the repeater 2 uses a code detector 21 to detect the inherent code, the test mode is attained and a switch 28 is changed over to the position of B. Then a test path is set and a test data is sent from a test data generator 22 and an error rate is measured by an error rate measuring circuit 23. After a predetermined time elapses, the switch 28 is changed over to the position A by the control of the code detector 21 and the result of measurement is transferred to the maintenance test equipment 1 by an incoming transmission circuit 27. Thus, whether the fault is a fault of a repeater or a line fault is distinguished and it is implemented without need of any monitoring line.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a maintenance test system for performing maintenance tests on relay lines.

[Conventional technology]

Conventionally, for example, in PCM-24B, when verifying the location of a fault in a relay system that includes multiple repeaters connected in cascade, a pulse/mother turn unique to each repeater is sent from the monitoring station to each repeater. The device extracts the low frequency component of the pulse pattern and uses the monitoring line to send the low frequency component back to the monitoring station (response), thereby verifying the location of the fault based on the presence or absence of a response. There is.

[Problem to be solved by the invention]

By the way, in the fault location verification described above, 1. For example, when a specific relay device has a failure, the low frequency signal specific to this relay device is not sent back to the monitoring station, and on the other hand, when the line connected to the relay device has a failure, Similarly, low frequency signals specific to the relay device are not returned. Therefore, there is a problem in that it is not possible to distinguish between a repeater failure and a line failure. Furthermore, a separate monitoring line is required for monitoring.

An object of the present invention is to provide a maintenance test system that can distinguish between relay equipment failure and line failure.

Another object of the present invention is to provide a maintenance test system that does not require a monitoring line.

[Means to solve the problem]

According to the present invention, in a relay system including a plurality of cascade-connected relay devices and a maintenance tester that tests the relay devices, the maintenance tester is assigned to each of the relay devices. a transmission means for transmitting the test code;
a first receiving means for receiving a return signal from the relay device; the relay device has a second receiving means for receiving the test specific code; and a test data generator for generating test data. a measuring means for measuring the error rate of the test data; and a predetermined route from the test data generator to the measuring means for a predetermined time when the test specific code is received. forming means for forming;
A maintenance test 7 system is obtained, comprising a transfer means for transferring the error rate measurement result to the maintenance tester as the return signal.

〔Example〕

The present invention will be explained below with reference to Examples.

Referring to FIG. 1, a maintenance test center (not shown) is equipped with a maintenance tester 1, and this maintenance tester 1 is connected to a first relay device (repeater) 2. The first relay device is connected to the second relay device 3. The tabs, first and second relay devices 2 and 3 are connected in cascade to form a relay system.

The maintenance tester 1 includes a code transmitter 11 and a processing section 12, and the tenth relay device 2 includes a code detector 21. Test data generator 22.Error rate measurement circuit 23.
Lower transmitter circuit 24. Upper receiving circuit 25. Lower side receiving circuit 26. It has an upper transmitting circuit 27 and a switch 28. Note that the second relay device 3 is also configured similarly to the first relay device 2.

During data communication, each switch 28 is switched to the A side, and when testing the first relay device 2, the maintenance tester 1 codes a code unique to the first relay device 2. It is sent out from the sender 11. When the first relay device 2 detects a unique code by the code detector 21, it enters a test mode and each switch 28 is switched to the B side. As a result.

Test data generator 22 and transmitter circuit 27. Downlink receiving circuit 26. Lower transmitter circuit 24. The outputs of the upper receiving circuit 25 and the error rate measuring circuit 23 are set.

Test data is sent from the test data generator 22,
The error rate measuring circuit 23 measures the error rate of the test data. After a predetermined time has elapsed, the code detector 2
1, each switch 28 is switched to the A side. The measurement results (test results) by the error rate measurement circuit 23 are transferred to the maintenance tester 1 by the upstream transmission circuit 27 and stored in the processing section 12. This test result is then processed by the processing section 12.

Note that when testing the second relay device 3, a unique code is similarly sent to the second relay device 2, and the test is performed in the same manner.

〔Effect of the invention〕

As explained above, in the present invention, since the relay device is tested remotely, there is an advantage that it is possible to easily distinguish between a device failure and a line failure. Furthermore, there is no need to provide a separate monitoring line.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a maintenance test system according to the present invention. 1... Maintenance tester, 2... First relay device, 3...
-Second relay device.

Claims (1)

[Claims] 1. In a relay system including a plurality of relay devices connected in cascade and a maintenance tester that tests the relay devices, the maintenance tester transmits a test specific code assigned to each of the relay devices. The relay device includes a transmitter for transmitting a signal, and a first receiver for receiving a return signal from the relay device, and the relay device has a second receiver for receiving the test specific code.
a test data generator for generating test data; a measuring means for measuring the error rate of the test data; The maintenance method is characterized by comprising a forming means for forming a predetermined route from the data generator to the measuring means, and a transfer means for transferring the error rate measurement result to the maintenance tester as the return signal. Test system.