JPS6282857A - Automatic answering signal system for ncu - Google Patents

Abstract

PURPOSE:To send an automatic answering signal to an originating side by checking the contents of incoming, and automatically operating the titled system to send a carrier signal to a data terminal when said signal exists, or connecting a telephone set to send ringing tone when said signal is absent. CONSTITUTION:When incoming from the exchange side through a subscriber's line is obtained, a lingua detecting circuit 22 detects the incoming to drive a control circuit 16. A switch 23 is closed by the circuit 25 to keep off-hook status and a switch 12 is closed to a connect a voice answer sending circuit to the subsriber's line and send a voice answering signal. The off-hook status cancels a lingua signal. A high impedance circuit 19 is always connected to the subscriber's line and a voltage on the subscriber's line is extracted, digitized by an ADC circuit 14 and outputted to a carrier detecting circuit 15 to check whether a carrier component is detected or not. When the carrier component is detected, the access of a data terminal 4 is identified, and at the no detection of the carrier component, the access of the telephone set 5 is identified.

Description

[Detailed Description of the Invention] [Summary] When an NCU with a modem carrier signal detection function receives a call, it identifies the device to be called, automatically connects it, and sends an automatic response signal to the calling party.

[Industrial application field]

The present invention relates to improvements in NCUs used for data communications.

An NCU connected to a telephone and a data terminal that has the ability to respond to incoming calls, identify whether the telephone or data terminal is being called, and automatically connect.
``Il'1fiN'' has an elegant configuration, and therefore an economical one has been strongly desired for a long time.

[Conventional technology]

FIG. 3 is a diagram illustrating an example of a conventional NCU.

In the figure, 1 is an exchange, 2 is an NCU, 3 is a modem, 4 is a data terminal, and 5 is a telephone. The same symbols represent the same objects throughout all the figures below.

Conventionally, when connecting the data terminal 4 to the exchange 1 via a line (analog transmission line), connect the modem 3 to the data terminal 4 as shown in the figure, connect the NCU 2 to the output side of the modem 3, and then connect to the line. I am taking a method to do so.

The modem 3 is a modem device that converts signal formats, and is an NC
U2 is a network control device (Network Control
Just as you call a destination by dialing on a normal telephone, even in the case of a data terminal, it is necessary to first connect to the other party, and the NCU 2 is used for this purpose.

[Problems to be solved by the invention] However, when a conventional NCU receives a call, if the NCU is connected to the terminal side in advance, it has a function of automatically answering the call, but it does not know whether the telephone is being called or whether the data terminal Whether the call was made or not was done manually.

An object of the present invention is to provide an NCU with the ability to automatically connect called equipment.

[Means for solving problems]

The above problem is caused by the ringer detection circuit 22 operating when a call is received from a caller via the railway line, closing the switch 24 to automatically answer the caller, and closing the switch 12 to automatically answer the caller. The response signal sending circuit 23 is connected to the subscriber line to perform a voice response, and the carrier detection circuit 15 checks whether there is a carrier signal on the subscriber line to determine whether it is the telephone (5) that is being called. It automatically identifies whether it is a data terminal (4), and if it identifies it as a telephone (5), the control circuit 16 closes the switch 26, connects the telephone (5) to the subscriber line, and then connects the ringing tone sending circuit 17. to call the telephone (5),
If it is identified as a data terminal (4), the control circuit 16 switches the switch 11 to connect the data terminal (4) to the subscriber line and sends a paging signal to the data terminal (4). .

[Effect]

According to the present invention, when an incoming call is received, the ringer detection circuit 22 detects the incoming call, extracts the voltage applied to the subscriber line through the high impedance dice circuit 19, converts it from analog to digital, and then detects the carrier. The circuit 15 checks whether there is a carrier signal on the subscriber line, and if there is a carrier signal, it connects to the data terminal 4 via the modem 3 and sends a paging signal to the data terminal 4. If there is no such device, the telephone 5 is automatically connected to the telephone 5 and a ringing tone is output.

[Example] FIG. 1 is a diagram illustrating an embodiment according to the present invention.

FIG. 2 is a flowchart of the NCU automatic response signaling system of the present invention.

In the figure, 10 is an NCU according to the present invention, 11, 12, and 13 are switches, 14 is an ADC circuit, 15 is a carrier detection circuit, 16 is a control circuit, 17 is a ringer output circuit, 18 is a protection circuit, 19 is a high impedance circuit, 20 is a capacitor, 21 is a coil, 22 is a ringer detection circuit, 23 is a voice response sending circuit, 24 is a switch, 25 is a coil, 26
is a switch.

The present invention will be described in detail below in accordance with the flowcharts of FIGS. 1 and 2. It is assumed that each switch is in the switch position shown in FIG. 1 when not in communication.

When there is an incoming call from the subscriber line exchange (!1.
to drive. The control circuit 16 closes the switch 25 to set the off-hook state (2), closes the switch 12, connects the voice response sending circuit 23 to the subscriber line, and sends out the voice response signal (2). Note that the ringer signal disappears when the off-hook state occurs.

The high impedance circuit 19 is always connected to the subscriber line, extracts the voltage on the subscriber line, and outputs the voltage on the subscriber line.
The circuit I4 digitizes the voltage and outputs it to the carrier detection circuit 15, and the carrier detection circuit 15 checks whether a carrier component is detected in the digitized voltage.

If the carrier component is detected, it is identified that the data terminal 4 is being called; if the carrier component is not detected, it is identified that the telephone 5 is being called. .

1) In the case of a data terminal, when a carrier component is detected, check the output of the ringer detection circuit 22 to check whether or not the originating side is disconnected. Remove it from the line■, open switch 25, and return it to the on-hook state■.

If it is not disconnected, it moves to the next step, and the control circuit 16 sends a signal to the modem 3 disconnection, and the switch 11
Flip it to the protection circuit 18 side and connect the subscriber line and modem 3■
do.

Also, the switch 12 is opened to disconnect the voice response sending circuit 23 from the subscriber line, stop the voice response signal, and start data communication.

2) In the case of a telephone, if the carrier component is not detected, check the output of the ringer detection circuit 22 to check whether the calling side has been disconnected.If disconnection occurs, stop the voice response sending circuit 23, open the switch 12, Open the switch 25 and do not return to the on-hook state ■.

If it is not disconnected, the control circuit 16 closes the switch 13 and connects the ringer sending circuit 17 to the line, closes the switch 26, connects the telephone 5 to the subscriber line, and calls the telephone 5. ■Send out sound.

When the telephone a5 goes off-hook, the control circuit 1G opens the switch 13 to stop the ringing tone, and opens the switch 12 to stop the voice response signal to 0, and enters into a talking state.

〔Effect of the invention〕

As explained in detail above, the present invention has the great effect of checking the details of the advance, automatically switching the connection to the telephone or data terminal, and in the meantime sending an automatic response signal to the calling party. be.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating an embodiment of the present invention, FIG. 2 is a flowchart of the NCU automatic response signal system of the present invention, and FIG. 3 is a diagram illustrating an example of a conventional NCU. In the figure, 1 is a switch, 2 is an NCU, 3 is a modem, 4 is a data terminal, 5 is a telephone, 10 is an NCU according to the present invention, 11
．． 12 and 13 are switches, 14 is an ADC circuit, and 15 is a switch.
1 is a carrier detection circuit, 16 is a control circuit, 17 is a ringing tone sending circuit, 18 is a protection circuit, 19 is a high impedance circuit, 20 is a capacitor, 21 is a coil, 22 is a ringer detection circuit, 23 is a voice response sending circuit, 24 is a switch, 25
is a coil, and 26 is S, I, and C.

Claims (1)

[Scope of Claims] In an NCU connected to a data terminal (4) and a telephone (5) via a modem (3), means for automatically answering a call from a calling party via a line; means for identifying whether a signal from the calling side is a ringing signal for the telephone (5) or a ringing signal for the data terminal (4); means for transmitting a ring tone to the telephone (5);
3) means for sending a calling signal to the relay data terminal (4), and when a call is received from the caller side via the line, the automatic response means sends a response signal via the line to the caller side. Then, the identification means identifies whether the incoming call from the calling party is a ringing signal of the telephone (5) or a ringing signal of the data terminal (4), and the ringing signal of the telephone (5) is determined. When it is identified that the data terminal (4) is a calling signal, the ringing sound sending means sends out a ringing sound, and when it is identified that it is a calling signal of the data terminal (4), the calling signal sending means sends out a calling signal. Automatic response signal system for NCU.