JPH04200054A - Method for testing a discontinuity of wired broadcast telephone exchange line - Google Patents

Abstract

PURPOSE:To test the presence of a broken telephone line without talking with a subscriber by sending a test signal from an exchange to a telephone set group of a specific telephone line and monitoring the reception state of a confirming signal reception means. CONSTITUTION:When a test signal is sent from an exchange 10 to a specific telephone set 12 via a designated telephone line 11 and the designated telephone line 11 is in normal state; a confirming signal in reply with the test signal is returned from the specific telephone set 12. Thus, after the transmission of the test signal, the reception state of the confirming signal reception means is monitored and it is possible to discriminate the presence of a broken wire of the specific telephone line based on the result of monitor. Thus, the presence of a broken wire of the designated telephone line is tested without talking with a subscriber.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a disconnection testing method for a wired broadcasting telephone line, and particularly in a wired broadcasting system in which a plurality of telephones are connected to the same telephone line. The present invention relates to a disconnection testing method for wired broadcasting telephone lines suitable for testing the presence or absence of disconnection.

2. Description of the Related Art Conventionally, when testing whether or not a telephone line is disconnected, as shown in FIG. A method has been adopted in which the telephone line 52 is tested to determine whether the telephone line 52 is disconnected by performing NNNn, calling the telephone 54 of n15, and determining whether or not a conversation can be made with the telephone 54.

Problems to be Solved by the Invention However, in the conventional method described above, it is necessary to call a distant subscriber's telephone 54 and talk to the subscriber, which may cause inconvenience to the subscriber, and there are various limitations on testing. There is a problem that there is. Furthermore, in reality, testing can only be performed when a subscriber reports a fault and confirms it, and there is a problem in that it is not possible to detect and repair line faults in advance.

The present invention solves these conventional problems,
To provide a disconnection testing method for a cable broadcasting telephone line, which can test whether or not the telephone line is disconnected when a call is made to a subscriber.

Means for Solving the Problems In order to achieve the above object, the present invention provides, in a wired broadcasting telephone system in which a plurality of telephones are connected to the same telephone line, a test for a group of telephones on a specified telephone line on the exchange side. A test signal sending means for transmitting a signal and a confirmation signal receiving means for receiving a confirmation signal from a telephone connected to a designated telephone line are provided, and a specific telephone among the telephones on the designated telephone line receives a signal from an exchange. A test signal receiving means for receiving a test signal and a confirmation signal return means for returning a confirmation signal to the exchange in response to the reception of the test signal are provided, and the test signal is sent from the exchange to a group of telephones on a specific telephone line, and then confirmed. This method employs a disconnection testing method for a cable broadcasting telephone line, which is characterized by monitoring the receiving state of a signal receiving means and determining whether or not a specified telephone line is disconnected from the monitoring results.

Therefore, according to the present invention, if a test signal is sent from the exchange side to a specific telephone via a designated telephone line, when the designated telephone line is in a normal state, the specific telephone responds to the test signal. Since the confirmation signal is sent back, it is possible to monitor the reception status of the test signal sending tube confirmation signal receiving means and determine from the monitoring result whether or not a particular telephone line is disconnected. Therefore, it is possible to test whether or not a specified telephone line is disconnected without having to talk to the subscriber.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 shows the configuration of an embodiment to which the present invention is applied. In FIG. 1, a telephone line 11 is connected to an exchange 10, and a plurality of cable broadcast telephones 12 are connected to the telephone line 11. The exchange 10 is provided with a subscriber circuit 13, a trunk 14, etc.
A test unit 15 is connected to. The test unit 15 has a built-in confirmation signal receiving means for receiving a confirmation signal from the telephone 12, and also includes a line specifying section 16 and a test signal generator 17 as test signal sending means.
It is configured to include a printer 18 that outputs test results.

On the other hand, the farthest telephone 12 among the group of 12 telephones includes a line loop response section 19, a test signal reception section 20. It is equipped with a line polarity detection section 21, a key 22, and a control section 23, the line loop response section 19 and the line polarity detection section 21 are each connected to the telephone line 11, and the test signal reception section 20 is connected to the telephone line 11 via a transformer 24 and a capacitor 25. and is connected to the telephone line 11. As shown in FIG. 2, the control unit 23 includes a telephone memory table 26, registers the test permission setting flag in the table 26 when the key 22 is operated, and the test signal receiving unit 20 It is configured to register a test signal reception flag when a test signal from ○ is received. When the test signal reception section 20 receives the test signal and the line polarity detection section 21 detects that the polarity of the telephone line 11 has been reversed, the line loop response section 19 is configured to perform line loop control. has been done.

Next, the operation of this embodiment will be explained based on FIGS. 3 and 4.

First, when a telephone line is specified by operating the line specifying section 16 of the test unit 15, according to this specification,
Trunk 14 and subscriber circuit 13 are connected. At this time, the exchange 10 inverts one polarity of the telephone line from negative to negative and reverses the other polarity from negative to positive as shown in FIG.

This polarity reversal operation prevents each telephone 12 housed in the telephone port 41!11 from making a call.

Next, when the test signal TST-F is output from the test signal generator 17, this signal TST-F is transmitted to the test unit 15,
The signal is sent out to the telephone line 11 via the trunk 14 and the subscriber circuit 13, and is transmitted to each telephone 12 side. The test signal TST-F is detected in each telephone 12, and the test signal receiving section 2o of the telephone 12 located farthest receives the test signal TST-F.
-F is received, a test signal reception flag is registered in the table 26 (code 202, steps 302 and 303).
. Thereafter, the control unit 23 determines whether or not the test availability setting flag in the table 26 is set to "1" by operating the key 22. That is, it is determined whether or not there is a flag set in the table 26 indicating that test signal reception is possible (step 304). At this time, when the flag is set, a control signal is output for a certain period of time from the control section 23 to the line loop response section 19, and line loop control is performed (steps 305, 306). That is, the terminal of the telephone line 11 is short-circuited to form a loop.

When this loop processing continues for a certain period of time t1, as indicated by reference numeral 203 in FIG. 3, this loop processing is transferred to the exchange 10 as a confirmation signal. When the subscriber circuit 13 of the exchange 10 detects this loop processing, the detection result is transferred to the test unit 15 via the trunk 14. This result is then output to the printer 18.

Since the loop of the telephone line 11 is released when the loop processing of the telephone 12 is completed, the exchange 10 detects this and executes polarity reversal processing to return the polarity of the telephone line 11 to its original state (204). ．． Step 307)
. When the switching equipment 10 side performs a process of reversing the polarity of the telephone line 11, and the polarity of the telephone line 11 is reversed and the original state is restored, as shown by reference numeral 204 in FIG. The detection unit 21 detects this, and the control unit 23
clears the test signal reception flag in table 26.

On the other hand, when the telephone line 11 is disconnected, the exchange 1
Since line loop processing is not executed even after a certain period of time has passed after sending out the test signal TST-F from 0, line loop processing is not performed on the exchange 10 side when a certain period of time has passed after sending out the test signal TPT-F. On the condition that there is no disconnection, it is determined that the telephone line 11 is disconnected, and the determination result is output to the printer 18, and a process of returning the polarity of the telephone line 11 to its original state is executed.

Further, after the test of the telephone line 11 is completed, the test of the telephone line according to the specification by the line specifying section 16 is performed by the method described above. By repeating this method in sequence, all telephone lines can be tested.

Effects of the Invention As is clear from the above embodiments, the present invention sends a test signal from the exchange side to a designated telephone line, then monitors the reception status of the confirmation signal receiving means, and detects disconnection of the designated telephone line based on the monitoring result. Since the presence or absence of the disconnection is determined, it is possible to test whether there is a break in the telephone line without having to talk to the telephone.

[Brief explanation of the drawing]

Fig. 1 is a system configuration diagram of an embodiment to which the cable broadcast telephone line disconnection test method of the present invention is applied, Fig. 2 is a configuration diagram of a telephone memory table, Fig. 3 is a time chart of line signals, and Fig. 4 is a flowchart for explaining the operation of the system shown in FIG. 1, and FIG. 5 is a block diagram for explaining the test method of Conventional Example 1. DESCRIPTION OF SYMBOLS 10...Switchboard, 11.-Telephone line, 12. Cable broadcasting telephone, 15.Test unit, 16. Line designation section, 1
7. Test signal generator, 18 Printer, 19. Line loop response unit, 20 Test signal reception unit, 21. Line polarity detection unit, 22 Key, 23. Control unit. Name of agent Patent attorney Akira Koyaji Baka 2 Figure 2/26 Ii 1 4th leap

Claims (1)

[Claims] In a wired broadcast telephone system in which multiple telephones are connected to the same telephone line, there is a test signal sending means for sending a test signal to a group of telephones on a designated telephone line on the exchange side, and a test signal sending means for transmitting a test signal to a group of telephones on a designated telephone line from the telephone set connected to the designated telephone line. A confirmation signal receiving means for receiving a confirmation signal from the exchange is provided, and a test signal receiving means for receiving a test signal from the exchange and a confirmation signal in response to reception of the test signal are provided on the side of a specific telephone among the telephones on a designated telephone line. A confirmation signal return means is provided to send the signal back to the exchange, and a test signal is sent from the exchange to a group of telephones on a specific telephone line.
A disconnection testing method for a cable broadcasting telephone line, characterized in that the receiving state of the confirmation signal receiving means is then monitored, and based on the monitoring result, it is determined whether or not the designated telephone line is disconnected.