JPH0414909B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] When testing a subscriber line connecting a line termination device to which various terminals are connected and a terminal device installed at a switching center, an idling signal is sent at the end of the test prior to a test end signal. A signal is sent to prevent the line termination device from controlling the terminal, thereby preventing the terminal from being erroneously controlled due to noise generated at the end of the test.

[Industrial application field]

The present invention relates to a line remote testing system, and more particularly to a remote control method for a line termination device when returning a subscriber line from a test control state to a normal subscriber line state after completing a subscriber line characteristic test and a maintenance isolation test. It is something.

According to the conventional method, noise is generated when the subscriber line is switched back from the test control state to the subscriber line normal state.
This noise sometimes caused the line termination equipment to malfunction and send erroneous control signals to the terminals. Therefore, this improvement has been strongly desired.

[Conventional technology]

FIG. 2 is a diagram showing an example of a conventional line termination device remote control system.

In the figure, 1a, 1b, and 1c are respective terminals, 2 is a line termination device, 3 is a subscriber line serving as a line under test, 4 is a subscriber line terminal station device, 5 is a subscriber line remote testing device,
5a is a test pattern generator, 5b is a bit error detector, 5c is a control circuit, 6 is a control line from the subscriber line remote testing device 5 to the subscriber line terminal device 4, and 7
is the control line from the subscriber line remote testing device 5 to the line termination device 2, 7' is the control line, and 8 is the line under test 3.
9 is a point where the line under test 3 is turned back for testing under control from the subscriber line remote testing device 5, 10a and 10b are switches, and 11 is an exchange. The same symbols represent the same objects throughout all the figures below.

At subscriber A's house, terminals 1a, 1b, 1c
and a line termination device 2 are provided, and the terminals 1a, 1
b and 1c are connected to a subscriber line 3 via a line termination device 2. Various types of terminals are used; for example, the terminal 1a is an image terminal, the terminal 1b is a personal computer terminal, and the terminal 1c is a telephone.

On the other hand, on the center side, the subscriber line 3 is connected to the subscriber line terminal equipment 4.
is further connected to the exchange 11, and the subscriber line remote testing device 5 is connected to the subscriber line end station device 4.

When the line is in a normal state, line termination device control information is sent from the exchange 11 to the subscriber line termination device 4 and the line termination device 2 located at subscriber A's home via the subscriber line 3. Connect with the terminal and perform the desired communication.

This line termination device control information is, for example, a signal composed of 8 bits, such as a calling signal from the exchange 11, a call termination signal, etc.

When putting the line into the test control state, a test start signal is sent from the subscriber line remote testing device 5 to the subscriber line terminal device 4 via the control line 6, and the switches 10a and 10b in the subscriber line terminal device 4 are activated. Perform switching, create a control route from subscriber line remote testing device 5 to control line 7 to switch 10a in subscriber line terminal device 4 to control line 7' to line termination device 2, and test control to line termination device 2. Information is sent.

The subscriber line remote testing device 5 includes a test pattern generator 5a for generating various patterns necessary for testing, and a bit error detector for testing errors in signals sent from the line termination device 2 side. Vessel 5
b, and a control circuit 5c that controls the test pattern generator 5a and the bit error detector 5b and connects them to a control line 6, a control line 7, and an information line 8.

This test control information is also a signal composed of 8 bits, the same as the line termination device control information, and is the test start signal, return signal, etc.

A return signal is sent from the subscriber line remote testing device 5 to the line termination device 2 via the control route. With this operation, the return point 9 operates inside the line termination device 2 and a return route is created, and a route from the subscriber line 3 to the switch 10b to the information line 8, which is the line to be tested, is created, so that the prescribed test can be performed. I can do it.

When the test is completed, a test completion signal is sent to the subscriber line terminal equipment 4 through the control line 6, and the switch 10
a and 10b are restored and return to normal state.

[Problem that the invention seeks to solve]

According to the above-mentioned conventional method, when the test is completed and the return point 9 is returned to its original state by the test completion signal from the subscriber line remote testing device 5, a relay (not shown) or the like that switches the return point 9 is activated. The generated noise is transferred to the subscriber line 3 from the line termination device 2.
The circuit terminal device 2 transmits a control signal corresponding to this pseudo signal to the terminal 1.
There is a drawback that there is a possibility that the terminals 1a to 1c may malfunction if the data is sent to terminals 1a to 1c.

The purpose of the present invention is to eliminate the drawbacks of the above conventional methods,
In a subscriber line remote testing system, before switching the line from a test control state to a normal state, the subscriber line remote testing device sends an idling signal to the line termination device, and the line termination device sends a control signal to the terminal. The purpose is to eliminate the possibility that the line termination device will erroneously control the terminal at the time of switching back by setting the terminal in an idling state in which the terminal is not in use, and then sending a test end signal to switch back the loopback point 9.

[Means for solving problems]

The means to solve the problem is to use various terminals 1a
The line termination device 2 to which ~1c is connected is the subscriber line 3
connected to the terminal equipment 4 of the exchange via
In a system in which a subscriber line remote testing device 5 connected to the terminal device 4 remotely controls the line terminating device 2 to test the subscriber line 3, the subscriber line remote testing device 5 includes: An idling signal generator 5d that generates an idling signal for setting the line terminating device 2 in a state where it does not control the various terminals 1a to 1c is provided, and the subscriber line remote testing device 5 is connected to the line terminating device 2. When testing the subscriber line 3 by remotely controlling the subscriber line 3, the subscriber line remote testing device 5 connects the
The idling signal generator 5d sends the line termination device 2
This is achieved by transmitting an idling signal to the test terminal and stopping the idling signal after transmitting the test end signal.

[Effect]

According to the present invention, an idling signal is sent out prior to the test end signal, and upon receiving this idling signal, the line terminating device 2 connects to the terminal connected to the line terminating device 2 no matter what signal is input from the office side. Since signals 1a to 1c are set to an idling state in which no signals are issued to control them, noise is generated when the loopback point 9 is cut back by the test end signal, and the line termination device 2 is disconnected from the subscriber line 3. Even if a signal is received from the terminal 1a to 1c, an erroneous control signal will not be sent to the terminals 1a to 1c.

〔Example〕

FIG. 1 is a diagram showing an embodiment of a line termination device remote control system according to the present invention.

FIG. 2 is an example of a configuration diagram of a conventional line termination device remote control system.

In the figure, 5d is an idling signal generator.

In the present invention, an idling signal is added to the test control information, and the idling signal is sent out before issuing the test end signal.

That is, an idling signal generator 5d is added to the conventional subscriber line remote testing device 5, and the idling signal is sent out under the control of the control circuit 5c before the test pattern generator 5a issues the test end signal.

When the line terminating device 2 receives this idling signal, the line terminating device 2 controls the terminals 1a to 1c connected to the line terminating device 2 no matter what kind of signal is input from the station side. It is set to an idling state with no signal.

For this reason, even if noise occurs when the line termination device 2 switches back the turning point 9 by the subsequently sent test end signal, it does not send a control signal to the terminals 1a to 1c, and the terminal 1a There is no possibility that ~1c will malfunction.

The subscriber line remote testing device 5 stops sending out the idling signal after a sufficient period of time has elapsed after sending out the test completion signal and for the noise generated when switching back at the turning point 9 to subside, and then stops sending out the idling signal. A signal is sent to set the terminating device 2 to the normal state, thereby causing the line terminating device 2 to
The normal state in which control is performed for 1c is restored.

Note that the idling signal in the above is a signal in which a signal (bit) for setting the test control state and a signal (bit) for setting the normal state are set in the control signal to the line termination device 2, and both bits are turned off. This is done by using a signal to set the state to the idling state. Therefore, sending and stopping of the idling signal is done by the idling signal generator 5.
Under the control of d, an idling signal is sent by turning off both of the bits mentioned above, and the idling signal is stopped by turning on the bit set to the normal state from this state, but at the same time, the idling signal is stopped by turning on the bit set to the normal state. A signal to be set will be sent.

〔Effect of the invention〕

As explained in detail above, according to the present invention, the line termination device 2 is set to the idle state by sending an idling signal prior to the test end signal, so that the line termination device 2 will not perform erroneous control over the terminals 1a to 1c, and will have a significant effect on stabilizing the operation of the system.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of a line termination device remote control system according to the present invention. FIG. 2 is a diagram showing an example of a conventional line termination device remote control system. In the figure, 1a, 1b, and 1c are respective terminals, 2 is a line termination device, 3 is a subscriber line serving as a line under test, 4 is a subscriber line terminal station device, 5 is a subscriber line remote testing device,
5a is a test pattern generator, 5b is a bit error detector, 5c is a control circuit, 5d is an idling signal generator, 6 is a control line from the subscriber line remote testing system 5 to the subscriber line terminal equipment 4, and 7 is a connection line. 7' is a control line, 8 is an information line connecting the subscriber line remote testing system 5 to the subscriber line remote testing system 5, 8 is an information line connecting the subscriber line remote testing system 5 to the subscriber line remote testing system 5. 10a and 10b are switches, and 11 is an exchanger.

Claims (1)

[Claims] 1. A line termination device 2 to which various terminals 1a to 1c are connected is connected to a terminal device 4 of an exchange via a subscriber line 3, and is connected to the terminal device 4. In a system in which a subscriber line remote testing device 5 remotely controls the line terminating device 2 to test the subscriber line 3, the subscriber line remote testing device 5 includes the line terminating device 2 connected to the various terminals. An idling signal generator 5d is provided that generates an idling signal to set the terminals 1a to 1c to a state in which no control is performed, and the subscriber line remote testing device 5 remotely controls the line termination device 2 to test the subscriber line. 3, the idling signal generator 5d is used prior to the test completion signal that the subscriber line remote testing device 5 issues to the line termination device 2 at the end of the test.
The circuit is configured to send an idling signal to the line termination device 2, and to stop the idling signal after sending the test end signal, to prevent the various terminals 1a to 1c from being erroneously controlled due to noise generated at the end of the test. A remote control method for a line termination device characterized by preventing