JPH0241066A - Network control circuit - Google Patents

Abstract

PURPOSE:To facilitate the diagnosis by receiving a signal from a test signal generating circuit at a selective cal signal reception circuit and comparing it with an output of the test signal generating circuit without forming any close circuit at the diagnosis of a telephone network control circuit. CONSTITUTION:When diagnostic is commanded to a control circuit 2 from an input terminal 1, a switching circuit 10 is controlled to switch a telephone number given to a selective call signal generating circuit 3 into a signal from a test signal generating circuit 9 to leave a closed circuit forming circuit 4 unclosed. Then one digit of the telephone number is extracted from the test signal generating circuit and it is given to the selective call signal generating circuit 3, from which the number is generated and given to one input of a comparator circuit 7. Then the same number is given to a selective call signal reception circuit 6 and its output is given to the other input of the comparator circuit 7, where they are compared, and the result is given to the control circuit 2. When they are coincident, the control circuit 2 extracts the next number and the similar operation is repeated. Thus, diagnosis is applied easily in the network controller without giving any effect onto the line.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a network control circuit in a telephone network, and more particularly to a diagnostic test method for preventing an automatic transmission section control circuit from erroneously transmitting a subscriber number. .

(Prior art) Conventionally, this type of network control circuit has been able to establish a connection with the other subscriber by detecting that the polarity of the line is reversed when the other subscriber hooks off after transmitting the other subscriber's number. I was confirming what had been done. Therefore, due to the selective paging signal being erroneously transmitted due to a failure in the network control equipment,
If you are connected to an incorrect subscriber number, this cannot be detected.
Therefore, in order to prevent erroneous connections due to failures in the network control circuit, the method of dealing with this is to periodically determine the destination in advance and repeatedly confirm that the selective paging signal is being generated correctly.

(Problems to be Solved by the Invention) In the conventional method described above, since the test is performed using a line, if the network control device is out of order, it may be necessary to make many mistakes in determining that it is out of order. The transmission will be repeated. Additionally, a tester must be placed at the other party during the test, which requires a large number of manpower.

Furthermore, since the number of subscriber numbers at the time of testing is limited, there is a drawback that it is not possible to test all selective calling signals.

(Means for Solving the Problems) A network control circuit of the present invention includes a selective call signal generation circuit, a circuit for forming a closed line, a polarity detection circuit, and a control circuit, and is connected to a telephone network. In a network control circuit that automatically or manually calls a subscriber's number, the test signal generation circuit, selective call signal reception circuit, and comparison circuit do not form a closed line circuit, and the output of the test signal generation circuit is The selective calling signal is input to the selective calling signal generating circuit to generate the selective calling signal, the selective calling signal is input to the selective calling signal receiving circuit, and the comparison circuit compares the output of the test signal generating circuit and the output of the selective calling signal receiving circuit. and a control circuit provided with means for comparison.

(Example) Next, an example of the present invention will be described with reference to the drawings.

The first part is a block diagram of a network control circuit according to one embodiment of the present invention. l is a control signal input/output terminal, 2 is a control circuit, 3
4 is a selective call signal generation circuit, 4 is a line closed circuit forming circuit, 5 is a line polarity detection circuit, 6 is a selective call signal reception circuit, 7 is a comparison circuit, 8 is a protection circuit, 9 is a test signal generation circuit, 10 1 is a switching circuit, and 11 is a connection terminal with a telephone line.

The output of the selective call signal generation circuit 3 is connected to the closed circuit forming circuit 4.
The signal passes through the protection circuit 8 and is output from the connection terminal 11 to the telephone line. Further, the selective calling signal receiving circuit 6 and the polarity detecting circuit 5 are connected between the selective calling signal generating circuit 3 and the closed circuit forming circuit 4. The output is received, the telephone number is decoded, and the polarity detection circuit 5 determines the DC polarity of the telephone line connected to the telephone line connection terminal 11. In the comparison circuit 7, the same telephone number as the telephone number outputted from the test signal generation circuit 9 and inputted into the selection call signal generation circuit 3 is inputted to one input terminal of the circuit 7, and the same number is inputted to the other input terminal of the circuit 7. The telephone number decoded by the selective call signal receiving circuit 6 is input to the terminal 6, and a comparison result between the two is output. The closed circuit forming circuit 4 is closed when performing a calling operation to form a DC loop.

A test signal generation circuit 9 generates a test telephone number during a diagnostic test. The switching circuit 10 selects the telephone number to be input to the selective calling signal generating circuit 3. The control circuit 2 receives a control signal and a subscriber number from a control signal input terminal 1, generates a control signal for a selective paging signal generation circuit, etc., and outputs a connection result to an input/output terminal 1.

Next, the operation of this embodiment will be explained. First, to explain the normal call operation, when the control circuit 2 receives the subscriber's telephone number and the instruction to start the call from the input/output terminal l, it controls the closed circuit forming circuit 4 to form a DC loop of the line. do. Next, the switching circuit 10 is controlled so that the telephone number to be inputted to the selective call signal generation circuit 3 is inputted from the control circuit 2. Further, the control circuit 2 outputs the subscriber telephone number received via the switching circuit 10 one digit at a time to the selective call signal generation circuit 3. A calling signal is generated and output to the line via the telephone line connection terminal 11. Thereafter, following the same procedure as above, when all subscriber telephone numbers have been dialed, the output of the polarity detection circuit 5 is monitored and the circuit waits for the polarity of the line to be reversed.When a polarity reversal is detected,
Control information indicating completion of connection is output via input terminal 1.

Next, the operation during diagnosis will be explained. When the control circuit 2 receives a diagnosis operation instruction from the control signal input/output terminal 1, it controls the switching circuit 10 and switches the telephone number input to the selective call signal generation circuit 3 so that it is manually input from the test signal generation circuit 9. . In addition, the closed circuit forming circuit 4 is left open,
To prevent the selective calling signal generated during the diagnostic operation from being output to the line. Next, one digit of the telephone number is extracted from the test signal generating circuit 9 and inputted to the selective calling signal generating circuit 3 to generate the selective calling signal. The selective calling signal is input to a selective calling signal receiving circuit 6, where it is identified and the corresponding subscriber telephone number is decoded.

The telephone number decoded by the selective call signal receiving circuit 6 is input to one input terminal of the comparator circuit 7.

Further, the telephone number output from the test signal generating circuit 9 is input to the other input terminal of the comparison circuit 7, and the two telephone numbers input manually to the respective input terminals are compared. The comparison result of the comparison circuit 7 is passed to the control circuit 2. If the comparison result is correct, the control circuit 2 extracts the next telephone number from the test signal generation circuit 9 and repeats the above-described operation.

If the comparison result is incorrect, the diagnostic operation is interrupted.

Finally, the diagnosis result is outputted via the control 11 signal input/output terminal 1.

f) Effects of the Invention) As explained above, according to the present invention, by diagnosing the operation of the network control circuit without connecting a telephone line,
This brings about the effect that diagnosis can be easily performed using only the network control device without affecting the telephone line at all.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a network control circuit according to one embodiment of the present invention. 1... Control signal input/output terminal, 2... Control circuit, 3...
...Selective call signal generation circuit, 4.Closed circuit formation circuit, 5.Polarity detection circuit, 6.
...Selective call signal receiving circuit, 7...Comparison circuit, 8.
...Protection circuit, 9...Test signal generation circuit, 10...
Switching circuit, 11...Telephone line connection terminal. Agent Patent Attorney Toshiyoshi Somekawa

Claims (1)

[Claims] a selective call signal generation circuit; a circuit for forming a closed circuit;
In a network control circuit that is composed of a polarity detection circuit and a control circuit, and is connected to a telephone network and automatically or manually calls a subscriber's number, the network control circuit includes a test signal generation circuit, a selective call signal reception circuit, and a comparison circuit. The control circuit does not form a closed line circuit, inputs the output of the test signal generation circuit to a selective call signal generation circuit to generate a selective call signal, and converts the selective call signal into a selective call signal. A network control circuit comprising means for inputting a signal into a receiving circuit and comparing the output of the test signal generating circuit and the output of the selective call signal receiving circuit using a comparing circuit.