JPH0119786B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for testing a calling signal sending circuit installed in a subscriber circuit of a time division telephone exchange.

The paging signal sending circuit in a time-division telephone exchange is installed in the subscriber circuit, and since the subscriber circuit is installed to support the subscribers accommodated in the exchange, the number of ring signal sending circuits is large, ranging from several thousand to several thousand. Up to 10,000 units of equipment are installed depending on the scale of the exchange.
Therefore, when testing the normality of the calling signal sending circuit, it is necessary to test each subscriber circuit. However, due to the large number of such devices, there is a drawback that testing time is long, and an efficient testing method is required for maintenance of switching equipment. The ringing signal is an alternating current signal that rings the bell of the subscriber's telephone, and the test method includes a circuit that detects the alternating signal and confirms that the signal is being sent normally, and a signal intermittent cycle and There is a problem in that a circuit for detecting signal intermittent time is required.

The present invention has been made in order to solve such problems, and a calling signal detection circuit is provided in a testing device for a calling signal sending circuit, and the arrival of the signal and the normality of the cycle are confirmed using software in the central processing unit. By performing these tests by sequentially changing the connections to the test equipment for each subscriber circuit, the ringing signals in the subscriber circuits installed in a large number of time-division telephone exchanges can be The purpose of this invention is to provide a test method that efficiently tests transmission circuits.

That is, the present invention provides a test method for a paging signal sending circuit included in a subscriber circuit of a time-division telephone exchange, which provides a connection path for connecting the subscriber circuit under test and a test device during testing, and The test equipment is equipped with a ringing signal detection circuit for detecting a ringing signal sent from the subscriber circuit under test during testing, and an information exchange circuit for transmitting the output signal of the detection circuit to the central processing unit of the exchange. During testing, the central processing unit controls the testing equipment to:
It is connected to the subscriber circuit under test through a connection path, detects a ringing signal from the circuit, transfers the output signal to a central processing unit, and has the processing unit confirm the normality of the ringing signal. It is characterized by the fact that

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

FIG. 1 is a block diagram showing an embodiment of the calling signal sending circuit testing method of the present invention. The test method of the embodiment shown in FIG. The test device 10 is connected to the test circuit 2 via a connection path 9.

The subscriber circuit 2 includes a subscriber monitoring circuit 3 and a calling signal sending circuit 4. This paging signal sending circuit 4 includes an information lead 5 from the central processing unit 14 for controlling instructions for sending a paging signal, and a subscriber who responds to the paging signal sending circuit 4 when a paging signal is sent to the subscriber. The central processing unit 14 detects that
An information lead 6 for transmitting information is connected thereto, and a calling signal generation source 7 is also connected thereto.

The test device 10 includes a pseudo-response circuit 11 and a ringing signal detection circuit 12, and the test device 10
It has an interface circuit 13 for exchanging information between the computer and the central processing unit 14. The pseudo response circuit 11 and the calling signal detection circuit 12 are as follows:
Each of them is connected to the connection path 9 and also connected to the central processing unit 14 via the interface circuit 13 described above.

The connection path 9 is configured to allow connection between the test device 10 and all subscriber circuits 2 of the exchange. This connection path 9 is connected to the subscriber telephone 1 side of the subscriber circuit 2, and the above-mentioned test device 10 is connected to the subscriber circuit 2 by disconnecting the subscriber telephone 1.

Next, the operation of the test method of the present invention will be explained.

Now, if the function of the calling signal sending circuit 4 is to be tested, the central processing unit 14 connects the subscriber circuit 2 and the test device 10 via the connection path 9.
At this time, the subscriber telephone 1 is disconnected from the exchange 1. In this state, the central processing unit 14
Instructs the calling signal sending circuit 4 to send out a calling signal via the information lead 5. Upon receiving this signal, the calling signal sending circuit 4 transmits the calling signal from the calling signal generation source 7 to the test device 1 via the connection path 9.
Send to 0. When the calling signal detection circuit 12 detects this calling signal, it converts this signal into a signal that can be processed inside the exchange, and the interface circuit 13 converts this signal into a signal that can be processed inside the exchange.
The data is transferred to the central processing unit 14 via the .

The central processing unit 14 determines whether or not the signal transferred from the interface circuit 13 matches the cycle of the ringing signal (for example, there is a ringing signal for 1 second, and there is no ringing signal for 2 seconds), or whether the phases match. It is checked by software processing whether or not the call signal is detected (for example, if there are three phases, in which phase the calling signal was detected). After confirming the normality of the calling signal, the central processing unit 14 instructs the pseudo response circuit 11 to respond via the interface circuit 13.

The pseudo-response circuit 11 receives the instruction and closes a loop, thereby returning a pseudo-response to the subscriber circuit 2 via the connection path 9. By detecting this pseudo-response, the calling signal sending circuit 4 stops sending out the calling signal received from the calling signal generation source 7, and the information lead 6 notifies the response detection.
The central processing unit 14 is notified of the detected response via the central processing unit 14. Then, the central processing unit 14
By receiving this response detection signal, the software processing is informed that the response processing instructed to the pseudo-response circuit 11 has been successfully transmitted to the paging signal sending circuit 4, and that the circuit has normally detected the response processing. Check.

By performing this series of test processing on all subscriber circuits by sequentially changing the connections of the connection paths 9, it is possible to test the paging signal sending circuit provided in each subscriber circuit.

As explained above, the present invention includes a calling signal detection circuit in a testing device for a calling signal sending circuit, and confirms the arrival of the signal and the normality of the cycle using software processing within the central processing unit. By sequentially changing the connections to the test equipment for each subscriber circuit and performing the test, it is possible to efficiently test the ringing signal sending circuits in the subscriber circuits installed in a large number of time-division telephone exchanges. There are effects that can be implemented.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the calling signal sending circuit testing method of the present invention. 1...Subscriber telephone, 2...Subscriber circuit, 3...
...subscriber monitoring circuit, 4...calling signal sending circuit,
5, 6...Information lead, 7...Call signal generation source,
8... Time division network, 9... Connection path, 10
... Test equipment, 11 ... Pseudo response circuit, 12 ...
Calling signal detection circuit, 13...interface circuit, 14...central processing unit.

Claims (1)

[Scope of Claims] 1. In a testing method for a paging signal sending circuit provided in a subscriber circuit of a time-division telephone exchange, a connection path is provided to connect the subscriber circuit under test and a test device during the test, and , the test equipment includes a ringing signal detection circuit for detecting a ringing signal sent from the subscriber circuit under test during the test, and an information exchange circuit for transmitting the output signal of the detection circuit to the central processing unit of the exchange. During testing, the test equipment is connected to the subscriber circuit under test via a connection path by the central processing unit, detects a ringing signal from the circuit, and sends the output signal to the central processing unit. 1. A method for testing a calling signal sending circuit, characterized in that the calling signal is transmitted to a processing device, and the normality of the calling signal is confirmed by the processing device.