JPS6020938B2 - Data communication circuit remote testing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention is a data communication line remote control system that remotely tests a communication line to which a subscriber line is connected via a toll line and a line termination device connected to both ends of the communication line from an in-office device. Concerning the test method.

In data communications, when testing a communication line and a line termination device such as a modem mounted on both ends of the line, the conventional method is for a maintenance person to go to one terminal in advance and put the line termination device into a loop. After setting, a test signal was sent out from the other terminal or a separate jack in the station on the line under test, and the received signal that was returned was judged to test the line and line termination.

Alternatively, a method has been adopted in which a line test between two stations is performed between two stations on the line under test by inputting a test signal from the isolation jack of one station and receiving the test signal at the isolation jack of the other station. There is. For this reason, when testing, maintenance personnel must visit the location where the line termination has been reinstalled, or maintenance personnel from the two stations must communicate with each other to conduct the test, making it difficult to isolate the problem. This method has the drawbacks of being time consuming and requiring a large number of personnel. The purpose of this invention is to eliminate the above-mentioned drawbacks, and to eliminate the need for maintenance personnel to travel far away or for maintenance personnel at two stations to communicate with each other.
An object of the present invention is to provide a data communication line remote testing method that can test all or part of a communication line and line termination equipment.

According to the present invention, the above object is achieved by installing an in-office device at an arbitrary station on the line under test. The test method according to the present invention will be explained below with reference to the drawings.

Communication lines 3, 4, and 5 for sending signals from line termination device 1 to line termination device 2 are connected between line termination devices 1 and 2, and communication lines 6, 7, and 8 for sending signals from line termination device 2 to line termination device 1 are connected. It is provided. Communication lines 3, 5, 6, and 8 are subscriber lines, and communication lines 4 and 7 are toll lines. In-office devices 9 and 10 are installed at the stations through which the communication lines consisting of subscriber lines and toll lines pass. Examination Department 11 in Fukurotaka 9
is for testing communication lines and line termination devices, and the test section 11 is controlled by a control section 12. Data communication with internal devices of other stations is performed through the data transmitting/receiving section 13. Similarly, the in-office device 10' also has a test section 14,
A control section 15 and a data transmission/reception section 16 are provided. The data transmitting/receiving units 13 and 16 of the in-office devices 9 and 10 transmit and receive data via a data communication line 17. The procedure for testing the communication lines 3 to 8 and the line termination devices 1 and 2 in the above-mentioned slow setup will be described below.

The test is started by an operator instructing the control unit 12 of one in-office device 9 to execute the test. Control unit 12
In response to this instruction, the tester 11 issues a command to perform a return test on the communication line 3 and the line termination device 1. Based on this command, the test section 11 disconnects the communication lines 3 and 4 and 7 and 8 that were connected before the start of the test, and sends a loop formation signal to the line termination device 1 via the communication lines 3 and 8. Send. For example, a DC signal can be used as this loop forming signal, and a DC signal is applied from the test section 11 to the communication lines 3 and 8, and a loop is formed by driving a relay installed inside the line termination device 1 or by driving a relay. can be formed. After that, the test section 11 sends a test signal to the communication line 8 and performs a test.

For example, by sending out a sine wave of a constant frequency and monitoring the level of the received signal sent back via the communication line 3,
and 8 are performed in the testing section 11. In addition, if the line termination device 1 is a data modulation/demodulation device, a data modulation/demodulation adjustment device for mystery testing is installed inside the testing section 11, and several patterns are sent out from this, and after being demodulated by the data modulation/demodulation device 1, The quality of the data modulation/demodulation device 1 can be determined by modulating the signal again, demodulating the signal sent back to the test section 11, and comparing the transmitted patterns. When the test section 11 completes the above test, it transmits the results to the control section 12, and also connects the oscillator to the communication line 4 to send out a signal at a constant level.

Next, the communication lines 5 and 6 and the line termination device 2 are connected to the in-office device 10 provided in another station via the control unit 12 data transmitting/receiving unit 13 and the data communication line 17 that is different from the communication line 4. Instruct the person to perform the test. This test is performed by the control section 15 decoding the content received by the data transmitting/receiving section 16 and giving a test execution instruction to the testing section 14. The method of testing that the testing section 14 performs on the communication lines 5 and 6 and the line termination device 2 is as follows:
The method is exactly the same as that for 8 and line termination device 1. Next, the test section 14 checks the level of the signal sent from the test section 11 via the communication line 4,
The quality of the communication line 4 is determined.

After that, the test section 14 sends a test signal to the communication line 7, and transmits the test results of the communication lines 4, 5, 6 and the line termination device 2 to the control section 15, and the control section 15 transmits and receives data. The results are transmitted to the in-office device 9 control section 12 via a data communication line 17 separate from the sections 16 and 13 and the line under test 7. Thereafter, the control section 12 instructs the testing section 11 to check the level of the signal transmitted from the testing section 14 via the communication line 7, and also sends a signal of a certain level to the communication line 7. The test section 11 executes a level check of the signal received from the communication line 7 and returns the result to the control section 12. As described above, the results of testing the communication lines 3 to 8 for each section and the results of testing the line termination devices 1 and 2 are all collected in the control unit 12, and the control unit 12 transmits the results to the operator via a display device or the like. show. Also, the control section 12
After the test is completed, the controller instructs the testing section 11 to restore and connect the communication lines 3, 4 and 7, 8 to the state before the test, and at the same time, the data transmitting/receiving sections 13, 16 and data
communication line 4 to the control unit 15 via the data communication line 17.
, 5 and 6, 7 respectively,
By sending this instruction to the test section 14, the control section 15
After the test is finished, the communication line is automatically restored to the state before the test.

In addition, in the above explanation, on the line under test, Hishimi 9, 10
We have shown an example in which in-office equipment is installed in two stations, but if in-office equipment is installed in even more stations through which communication lines 4 and 7 pass,
It is clear that it is possible to test the section more subdivided.

Furthermore, the case where the communication line passes through one arbitrary station is an example of a configuration in which there is only one station, considering that there are no communication lines 4 and 7, which can be easily understood from the above description. As explained above, according to the test method of the present invention, a communication line (subscriber line, toll line) and a line termination device connected to both ends of the communication line are tested at one of the multiple stations through which the line under test passes. It is possible to test from one station to each section where the station is installed, and it is not necessary for the maintenance person to travel to the distant place where the line termination equipment is installed, or for the maintenance personnel at the two stations to communicate with each other while conducting the test. Since there are no tests, the test time is shortened, and a large number of personnel are not required, which has the effect of significantly improving test efficiency.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a data communication line remote testing method according to the present invention. 1, 2: Line termination device, 3 to 8: Communication line, 9, 10:
Internal device, 11, 14: Test section, 12, 15: Control section,
13, 16: data transmitting/receiving section, 17: data communication line.

Claims (1)

[Claims] 1. In the data communication line remote testing method, which tests a communication line to which a subscriber line is connected via a toll line and a line termination device connected to both ends of the communication line, the above-mentioned toll line and An in-office device is installed in two or more stations where subscriber lines are relayed, and a line termination device is set in the in-office device to be in a loop state via the subscriber line connected to the own station, and the subscriber line is connected to the local station. means for transmitting a test signal to a subscriber's line and receiving the test signal from the subscriber's line to determine the quality of the subscriber's line and line termination equipment; between a test section comprising a means for transmitting a test signal to the equipment, receiving the test signal from the internal equipment of the partner station, and determining the quality of the toll line, and the internal equipment of the partner station; a data transmitting/receiving unit that transmits data indicating the quality of the long-distance line and the quality of the subscriber line of the other station and its line termination equipment via a communication line different from the line under test; A data communication line remote testing method that includes a control unit that controls the transmitter and receiver.