JPH0256164A - Network control circuit - Google Patents

Abstract

PURPOSE:To prevent a transmission to a wrong subscriber's number by comparing the output of a selective call signal receiving circuit with the said column of the transmitted other subscriber's number by a comparing circuit, opening a switching path forming circuit and stopping calling. CONSTITUTION:A comparing circuit 7 compares the output of a selected call signal receiving circuit to receive a selective call signal at the time of the calling with the said figure of the transmitted other subscriber's number. A control circuit 2 transmits one column of the next subscriber's telephone number to the selective call signal generating circuit 3 when the output of the circuit is true. Waiting for the inversion of polarity of a line by a polarity detecting circuit 5, when a polarity inversion is detected, the control information of connection completion is outputted. When the output of the circuit 7 is false, the circuit 2 stops the action of the circuit 3, controls a closed circuit forming circuit 4, opens a direct-current loop and stops the calling action. Thus, the transmission to the wrong subscriber's number is prevented.

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 circuit device for preventing erroneous transmission of a subscriber's number in an automatic transmission type copper control circuit.

(Prior Art) Conventionally, this type of network control circuit detects that the polarity of the line is reversed when the call arrives at the other subscriber and turns the footer off after transmitting all digits of the other subscriber's number. It was confirmed that the connection with the other subscriber was established.

(Problems to be Solved by the Invention) The conventional automatic transmission type copper control circuit described above only detects that a call has arrived at the other party's subscriber, and does not know whether the call has been correctly received at the number of the other party's subscriber to whom the call was attempted. I can't confirm.

Therefore, even if a selective call signal is erroneously transmitted due to a failure of the network control device, it cannot be detected even if a connection is made to the wrong subscriber number.

(Means for Solving the Problems) The cable control circuit of the present invention is composed of 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 to connect to the other party. In addition to the function of automatically calling the subscriber's number, the function also includes a selective calling signal receiving circuit that receives a selective calling signal at the time of making a call, and the output of the selective calling signal receiving circuit and the corresponding digit of the calling party's number. and a control circuit equipped with a means for opening a closed circuit forming circuit and stopping calling based on the detection output of the comparison circuit. ing.

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

FIG. 1 is a block diagram of a network control circuit according to one embodiment of the present invention. 1 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 receiving circuit, 7 is a comparison circuit, 8 is a protection circuit, and 9 is a connection terminal with the telephone line. It is.

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 9 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, and the selective calling signal receiving circuit 6 is connected to the output of the selective calling signal generating circuit 3. and decrypt the phone number. On the other hand, the polarity detection circuit 5 determines the DC polarity of the telephone line connected to the telephone line connection terminal 9. Comparison circuit 7
The output signal of the selective paging signal receiving circuit 6 and the subscriber telephone number input to the selective paging signal generating circuit 3 are inputted to and compared with each other. The closed circuit forming circuit 4 is closed when performing a calling operation to form a DC loop. Control circuit 2
inputs a control signal and a subscriber number from the control signal input/output terminal 1, generates a control signal for the selective paging signal generation circuit 3, etc., and outputs the connection result to the input/output terminal 1.

Next, the operation of this embodiment will be explained. When the control circuit 2 receives the subscriber telephone number and the instruction to start calling from the input/output terminal 1, it controls the closed circuit forming circuit 4 and connects it to the telephone line connection terminal 9 to form a DC loop of the line. The DC polarity of the telephone line is determined by the output of the polarity detection circuit 5, and it is confirmed that the line is not distorted. Thereafter, the 0 selective calling signal generating circuit 3 transmits one digit of the received subscriber's telephone number to the selective calling signal generating circuit 3, which generates a selective calling signal corresponding to the received subscriber's telephone number, and connects the telephone line. It is output to the line via the connection terminal 9.

Further, the selective calling signal is transmitted to the selective calling signal receiving circuit 6.
is also input, the selective call signal is identified, and the corresponding subscriber telephone number is output.

The identified subscriber telephone number is input to one input terminal of the comparator circuit 7. The same subscriber telephone number sent to the selective paging signal generation circuit 3 from the control circuit 2 is input to the other input terminal of the comparison circuit 7. Comparison circuit 7 compares the two subscriber telephone numbers input to respective input terminals, and notifies control circuit 2 of the result.

If the output of the comparison circuit 7 is true, the control circuit 2 transmits one digit of the next subscriber's telephone number to the selective call signal generation circuit 3. Thereafter, when all subscriber telephone numbers have been dialed using the same procedure as above, the polarity detection circuit 5 waits for the line polarity to be reversed, and when the polarity reversal is detected, a connection completion signal is sent via the input/output terminal l. Output control information.

On the other hand, when the output of the comparison circuit 7 is false, the control circuit 2 stops the operation of the selective call signal generation circuit 3, controls the closed circuit forming circuit 4 to open the DC loop, and interrupts the calling operation; Control information indicating the interruption due to the aforementioned factor is output to the input/output terminal 1.

(Effects of the Invention) As explained above, according to the present invention, it is possible to prevent a call from being made to a wrong subscriber number due to a failure of the network control device, and to notify the failure of the network control device. effective.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a network control circuit according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... 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...Telephone line connection terminal. Agent Patent Attorney Rikichi Somekawa

Claims (1)

[Claims] a selective call signal generation circuit; a circuit for forming a closed circuit;
A network control circuit that is connected to a telephone network and automatically calls a subscriber's number, which comprises a polarity detection circuit and a control circuit; A comparison circuit that compares the output of the selective call signal receiving circuit with the relevant digit of the called party's subscriber number, and means for opening the closed circuit forming circuit and stopping the call when the output of the comparison circuit is false. A network control circuit characterized in that it has a control circuit.