JPH0636523B2 - Subscriber line tester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is used for a connection test of a communication line.

The present invention is used to test that the telephone subscriber line, the subscriber line of the data terminal equipment, and the subscriber line for communication are properly connected.

〔Overview〕

The present invention relates to a device for testing whether a subscriber line is correctly connected after connection work of the subscriber line such as connection of a multi-pair cable is performed, and a protector provided at a retracted position of the subscriber line, for example. In parallel with this, connect a device that sends a signal of a preset number to the subscriber line by reversing the DC polarity of the subscriber line, and reverse the polarity of the subscriber line on the test stand of the exchange. By reading the number sent from the device, the subscriber line connection test can be performed simply and accurately without the need for the subscriber to be tested to respond.

[Conventional technology]

New installation or change of subscriber line introduction equipment of telephone station, new installation or extension of underground cable, transfer of telephone line due to change of road form due to land readjustment, relocation of multi-pair cable of subscriber line due to other reasons Construction is done. After this replacement work, all subscriber lines must be tested for proper connection. If the connection is not made correctly, the incoming call will be connected to another and the connection will be lost, and the calling will be charged by the other subscriber, which is extremely inconvenient. To do.

Conventionally, the test for this was, as a rule, that a call signal was sequentially sent to each subscriber line from the test stand of the telephone station to have the user respond, and the tester verbally announced the number to make a correct connection. Is taking a way to check.

[Problems to be solved by the invention]

However, in recent years, telephones and terminal devices have come to be connected with outlets, and it is up to the user to connect the terminal device to the outlet, and the terminal device is not always connected to the end of the subscriber line. Since it is not always true, it is difficult to surely perform all connection tests by the method of requesting a response from the user as described above. However, even if the terminal device is connected, the voice response may not be made due to the connection of the facsimile device, etc. Furthermore, the telephone for general household use is out of the user at the time of testing. There are many problems such as users who do not like to respond due to various reasons.

The present invention solves this problem, and an object of the present invention is to provide an apparatus capable of correctly and reliably executing a connection test without requiring a user who is a subscriber line user to request a response.

[Means for solving problems]

The tester of the present invention is a device that is connected to a subscriber line during a test, and is a terminal that is connected between a pair of subscriber lines on which direct current is superposed and an inversion detection that detects inversion of the DC polarity between these terminals. A circuit, a timer circuit that is activated by this inversion detection circuit and sends an output signal after a predetermined time, a number setting circuit that can set a number of several digits, and a timer circuit that is activated by the output signal of the timer circuit and is set in the number setting circuit. Number transmission circuit that transmits a signal corresponding to the number to the terminals in time series, a use detection circuit that monitors the voltage between the terminals and detects that the voltage is below a predetermined value, and And a means for prohibiting the operation of the number transmission circuit by each detection output of the use detection circuit or the call detection circuit.

Further, the number transmission circuit is operated by a switch circuit that is closed by an output signal of the timer circuit, a rectifier circuit connected to the terminal through the switch circuit, and an output DC current of the rectifier circuit, and the number is operated. It is preferable to include a dial signal generation circuit that transmits a voice dial signal corresponding to the number set in the setting circuit in time series. [Operation] The test method using the test device of the present invention is as follows. First, the tester of the present invention is preliminarily connected to the subscriber line to be replaced, for example, electrically in parallel with the terminal of the protector installed at the retracted position in the subscriber's house.
The tester is connected to the subscriber line scheduled to be replaced by taking advantage of the opportunity of maintenance of the subscriber line or the opportunity of new construction.

The tester number is, for example, four digits. This number may be fixedly prepared in advance with a large number of different numbers, and the number of the tester attached to which subscriber line may be recorded. However, it is desirable that the number can be set by a digital switch so that the operator can easily change the number setting by using a pen tip of a ballpoint pen. It is recommended that the lower 4 digits be set and installed in this tester.

The test is conducted from the test bench, which is a part of the switching center equipment. When one subscriber line is captured by the test stand and the polarity of the direct current is reversed, the tester to which the subscriber line is attached is activated. When the set time of the timer circuit (for example, several seconds) elapses, the preset digit numbers are sequentially transmitted from the tester. Upon receiving this number and displaying it on the test bench, the test operator confirms that the connection is correct.

In the structure in which the voice dial signal is transmitted from the tester, the signal corresponding to this number can be directly received and displayed by the dial tester of the test bench. When the set number is the lower four digits of the subscriber number, this number may simply be checked against the subscriber number.

When the subscriber line is captured from the test stand and the polarity of the DC current is reversed, the ringing signal (16Hz) is not transmitted. Therefore, the subscriber does not respond due to polarity reversal. In the course of this test, the subscriber who is the user is unaware of the test and does not disturb the user at all.

The tester of the present invention as described above is a simple and inexpensive device, and can be made extremely small by using an integrated circuit. The tester of the present invention operates with a direct current superimposed on the subscriber line and does not require a special power supply. Also,
There is no inconvenience to leave the tester of the invention connected to the subscriber line for a very long time. The tester can be removed at any time.

A usage detection circuit that monitors a voltage between terminals of a subscriber line and detects that the voltage is a predetermined value or less, a calling detection circuit that detects that a calling signal is present between the terminals, and the usage detection circuit Alternatively, when a means for inhibiting the operation of the number transmission circuit by each detection output of the call detection circuit is provided, this subscriber line is used by the user when performing a test using this tester. The test can be stopped and the user's use can be prioritized when the use is about to be started while the test is being performed or while the test is being performed.

Furthermore, when a dial signal generation circuit that transmits a voice dial signal in time series is used as the number transmission circuit,
This circuit is the basic circuit of the automatic dial sending circuit, and it can be easily manufactured by using the integrated circuit for the telephone of the number storage type.

〔Example〕

FIG. 1 is a system configuration diagram of an embodiment of the present invention. The test stand 3 of the exchange is connected via the exchange 4 to one of a number of subscriber lines 5. Subscriber terminal devices (for example, telephones, facsimile devices, etc.) 7 are connected to the subscriber lines 5, respectively. The subscriber line tester 1 of the present invention is connected between a pair of subscriber lines. The tester of the present invention is extremely small and can be connected in parallel to the terminals of the protector installed at the retracted position in the subscriber's house. Reference numeral 2 displayed side by side on the test stand 3 is a dial signal receiver.

FIG. 2 is a block diagram of the tester of the embodiment of the present invention.
This tester includes a pair of terminals 11 and 12 connected between a pair of subscriber lines on which direct current is superimposed, an inversion detection circuit 21 that detects inversion of direct current polarity between these terminals, and an inversion detection circuit 21. Timer circuit that starts up and outputs an output signal after a predetermined time
27, a number setting circuit 43 capable of setting a number of several digits, and a signal corresponding to the number set in the number setting circuit 43 which is activated by the output signal of the timer circuit 27 and is transmitted to the terminals 11 and 12 in time series. And a number transmission circuit 30 for controlling the number.

Further, the tester of this embodiment monitors the voltage between the terminals 11 and 12 and detects the use detection circuit 23 for detecting that the voltage is below a predetermined value, and that there is a ringing signal (16 Hz) between the terminals. Call detection circuit 25 for detecting, and the use detection circuit 23
And an OR circuit 31 which receives each detection output of the call detection circuit 25 as an input, and the output of this OR circuit is a timer circuit 27.
It is connected to the prohibited input terminal of.

Further, the number transmission circuit 30 includes a switch circuit 33 that is closed by the output signal of the timer circuit 27, and the switch circuit 33.
Rectifier circuit 35 connected between the terminals 11 and 12 via
And a number transmitting circuit 30 which operates by the output DC current of the rectifying circuit 35 and transmits a voice dial signal corresponding to the number set in the number setting circuit 43 in time series. The number transmission circuit 30 is a part of a basic circuit of a telephone that automatically sends a telephone number stored in advance, and can be easily configured by a commercially available integrated circuit. Also,
The number setting circuit 43 is configured to include a digital switch operated by the operator.

FIG. 3 is a block diagram of a dial signal receiver 2 provided on the test stand 3. This device comprises a pair of line terminals 51 and 52 connected to a subscriber line via an exchange 4, a signal analysis circuit 53 for analyzing a voice dial signal coming to these terminals, and a shift for temporarily holding the analysis result in order. It includes a register 55 and a display device 54 for displaying the contents of the shift register 55. The terminal 56 is an input terminal of a clear signal for clearing the display.

The dial signal receiver shown in FIG. 3 is mounted on a standard test bench for receiving and testing voice signal dials.

The tester 1 of the present invention is connected to the protector terminal of the subscriber line for which the replacement work is scheduled, by utilizing the opportunity of maintenance in the house or the opportunity of construction of the subscriber line in the vicinity. Fig. 4 shows the procedure for conducting the connection test after the replacement work is completed.

First, one of the desired subscriber lines is captured from the test stand 3 by operation, and the DC polarity of this subscriber line is reversed. At this time, the ringing signal (16 Hz) is not transmitted. As a result, when the inversion detection circuit 21 detects this polarity inversion in FIG. 2, the detection output is sent out and the timer circuit 27 is started. In this embodiment, the timer circuit 27 outputs the output signal after the time is up in 7 seconds. Switch circuit by this output signal
33 is closed, the direct current of the subscriber line is applied to the rectifier circuit 35, and the output current thereof is the control circuit 39 and the clock signal generation circuit.
37 is applied to the dial signal generating circuit 41 to activate each circuit. The dial signal generation circuit 41 synchronizes with the timing signal sent by the control circuit 39 and sequentially outputs the four-digit number set in the number setting circuit 43 as a voice dial signal to the terminals 11 and 12 via the switch circuit 33. Send out.

A dial signal receiver provided on the test stand 3 of the exchange receives the voice dial signal and displays its contents. By checking the displayed contents, it can be confirmed that the connection work was correct.

If the 4-digit number set in the tester 1 is made equal to the lower 4-digit number of the subscriber number to be connected in advance, this can be confirmed by simply comparing the displayed number with the subscriber number. You can

The timer circuit 27 opens the switch circuit 33 at the timing when the signal of each digit corresponding to the number is transmitted, and completes one operation.

In this tester 1, when the terminal of the subscriber line is operated to be in the off-hook state when the test is being executed or during the test execution, the use detection circuit 23 detects that the voltage across the terminals has dropped. Then, the prohibition signal is sent to the timer circuit 27. In addition, the call signal (16H
z) arrives, the call detection circuit 25 detects this and
The inhibit signal is sent to the timer circuit 27. When the prohibition signal is input, the timer circuit 27 resets the timer, stops sending the output signal, and opens the switch circuit 33. This ensures that the regular use of the subscriber line is prioritized for performing the test.

〔The invention's effect〕

As described above, according to the present invention, the connection test can be correctly and surely executed without asking the user who is the user of the subscriber line for a response. According to the invention,
When a terminal is not connected to the subscriber line, a device that cannot respond by voice to the subscriber line is connected as a terminal device, or the subscriber who is the user is absent or wants to respond. Even if there is no connection test, the connection test can be correctly and surely executed.

The subscriber line tester of the present invention is inexpensive and small, and leaving it connected to the subscriber line for a long period of time has no effect.

In particular, when the use detection circuit and the call detection circuit are provided and the detection output prevents the operation of the tester of the present invention, even if the test by the tester of the present invention happens to be used by the user, Since the user's use is prioritized, it does not interfere with the user's use.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of an embodiment of the present invention. FIG. 2 is a block diagram of the tester of the embodiment of the present invention. FIG. 3 is a block diagram showing the configuration of a dial signal receiver installed on the test stand according to the embodiment of the present invention. FIG. 4 is a view for explaining the test procedure of the present invention. DESCRIPTION OF SYMBOLS 1 ... Subscriber line tester of this invention, 2 ... Dial signal receiver, 3 ... Test stand, 4 ... Exchange, 5 ... Subscriber line, 7 ... Terminal device, 11, 12 ... Terminals connected to a subscriber line, 21 ... Inversion detection circuit, 27 ... Timer circuit, 30 ... Number transmission circuit, 43 ... Number setting circuit.

Claims (3)

[Claims] 1. A terminal connected between a pair of subscriber lines on which direct current is superposed, an inversion detection circuit for detecting inversion of direct current polarity between the terminals, and an output signal which is activated by this inversion detection circuit after a predetermined time. , A number setting circuit capable of setting a number of several digits, and a signal corresponding to the number set in the number setting circuit, which is activated by the output signal of the timer circuit, is transmitted to the terminal in time series. A number transmission circuit, a usage detection circuit that monitors the voltage between the terminals and detects that the voltage is below a predetermined value, a ring detection circuit that detects that there is a ring signal between the terminals, And a means for inhibiting the operation of the number transmission circuit by each detection output of the use detection circuit or the call detection circuit. 2. The subscriber line tester according to claim 1, wherein the number set in the number setting circuit is the last four digits of the subscriber number. 3. The number transmission circuit includes a switch circuit that is closed by an output signal of the timer circuit, a rectifier circuit connected to the terminal through the switch circuit, and operates by an output DC current of the rectifier circuit. And a dial signal generating circuit for time-sequentially transmitting a voice dial signal corresponding to the number set in the number setting circuit, wherein the number setting circuit includes a digital switch operated by an operator. Subscriber line tester described.