JPH05316254A - Terminal network controller - Google Patents

Abstract

PURPOSE:To provide an inexpensive terminal network controller with less parts. CONSTITUTION:Before sending or during data communication a control section 24 uses the same offhook detection section 22 to monitor the use/unuse of a telephone set 3 connected to a telephone set connecting terminal 4, and attaches a priority to the use of the telephone set. As the control section 24 detaches the telephone set 3 from a telephone line 2 during selection signals is being sent, the telephone set 3 does not ring by receiving the selection signals sent from the selection signal sending section 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal network control device which is connected to a telephone line and is further connected with a communication device such as a telephone at a subsequent stage to automatically make a call.

[0002]

2. Description of the Related Art A conventional terminal network control device 1 is connected to a telephone line 2 as shown in FIG. 2, and a telephone connection for connecting a line terminal device including a telephone 3 (hereinafter, a telephone will be described as an example). The terminal 4, the first off-hook detection unit connected between the telephone connection terminal 4 and the telephone line 2 to detect the off-hook of the telephone 3 using the power of the telephone line 2, and the power of the terminal network controller 1 are used. A second off-hook detecting section 6 for detecting an off-hook of the telephone 3; a switching section 6 for switching the connection destination of the telephone connection terminal 4 to the first off-hook detecting section 5 or the second off-hook detecting section 7; and a telephone line. 2, an incoming call detection unit 8 for detecting a ringing signal, and a selection signal transmission unit 9 for transmitting a selection signal to the telephone line 2.
And a data transmission / reception unit 1 for transmitting and receiving signals of the telephone line 2.
0, an incoming call detection unit 8, a first off-hook detection unit 5 and a second off-hook detection unit 7 to receive signals from the control unit 11 for controlling the switching unit 6 and the selection signal transmission unit 9. ing.

First, a basic operation of the terminal network control device 1 will be described, and then a detailed description will be given. The following functions are realized when the terminal network control device 1 automatically transmits and communicates. 1) To prevent the bell of the telephone 3 connected to the telephone connection terminal 4 from ringing when the terminal network control device makes a call by dial pulse. 2) When the terminal network control device 1 is communicating, the usage state of the telephone 3 is monitored, and when the off-hook of the telephone 3 is confirmed, the communication is stopped and the telephone 3 is preferentially used.

A method for the terminal network control device 1 to prevent the ringing of the bell due to the above 1) dial pulse will be described.
When the terminal network control device 1 performs dial pulse transmission, the voltage across the telephone line has a waveform shown in FIG. On the other hand, the bell circuit of the telephone 3 connected to the telephone connection terminal 4 has an inductor L and a capacitor C as shown in FIG.
It is configured to be connected in series. Therefore, if the telephone connection terminal 4 is connected to the telephone line 2 when the selection signal transmission unit 9 transmits the dial pulse waveform shown in FIG. 3, the capacitor of the telephone 3 connected to the telephone connection terminal 4 is connected. Current also flows through C and the inductor L, and the inductor L rings the bell in the telephone 3. In order to prevent the ringing of the bell, the control unit 11 operates the switching unit 6 at the time of transmitting the selection signal to connect the telephone connection terminal 4 to the second off-hook detection unit 7 so that the telephone line 2 and the telephone 3 are connected.
Is separated.

Next, the operation of each unit when the terminal network control device 1 makes a call will be described, and the off-hook detection method of the telephone 3 and the off-hook detection unit used at each timing will be described. In the standby state, the switching unit 6 is in a state in which the telephone connection terminal 4 is connected to the first off-hook detection unit 5. When the terminal network control device 1 tries to start a call, the control unit 11 confirms that the telephone line 2 is not used and is in an idle state, and then shifts to a selection signal sending operation. The telephone line 2 being idle means 1) telephone 3
Is not used, and 2) the call signal from the telephone line 2 has not arrived. In order to confirm the above 1) and 2), the control unit 9 controls the first off-hook detection unit 5
Also, the input signal from the incoming call detection unit 8 is confirmed. When the telephone line 2 is not idle, it waits until it becomes idle, and when it is idle, it shifts to the selection signal sending operation. When transmitting the selection signal, the control unit 11 first operates the switching unit 6 to disconnect the telephone 3 from the telephone line 2 and to connect the telephone 3 to the second off-hook detection unit 7.
Connect to. As a result, the telephone 3
This prevents the bell from ringing. When transmitting the selection signal, first, the control unit 11 controls the selection signal transmission unit 9 to close the telephone line 2 and starts transmitting the selection signal after 3 seconds defined by the technical standard of the terminal equipment has elapsed. When the connection with the partner terminal is completed, the control unit 11 controls the data transmission / reception unit 10 to start data communication. When the data communication is completed, the control unit 11 first causes the data transmission / reception unit 10 to
To open the telephone line 2. Finally, the control unit 11 operates the switching unit 6 to activate the telephone connection terminal 4
And the first off-hook detector 5 are connected to return to the standby state.

From the viewpoint of preferential use of the telephone 3, the following is performed. Before sending the selection signal or in the standby state, the telephone connection terminal 4 is connected to the first off-hook detector 5, and when the terminal network control device 1 is communicating, the telephone connection terminal 4 is in the second state. It is connected to the off-hook detector 7. That is, even when the terminal network control device 1 is communicating, the control unit 11 monitors the output of the second off-hook detection unit 5,
It monitors the off-hook of the telephone 3.

Next, the circuit operation of the first off-hook detecting section 5 and the second off-hook detecting section 7 and the operation when the off-hook is detected during data communication will be described. First off-hook detector 5 and second off-hook detector 7
Both utilize that the direct current resistance becomes 50Ω or more and 300Ω or less when the telephone 3 is in the off-hook state. In the first off-hook detecting section 5, since the DC resistance is 1 MΩ or more when the telephone 3 is in the on-hook state, the photocoupler PC12 does not emit light and the output of the first off-hook detecting section 5 becomes low. On the other hand, when the telephone 3 is in the off-hook state, the DC resistance of the telephone 3 becomes 50Ω or more and 300Ω or less, so that the photodiode of the photocoupler PC12 emits light, the phototransistor is turned on, and the output of the first off-hook detector 5 becomes the high state. Become. When the telephone 3 is connected to the second off-hook detecting section 7 and is in the on-hook state, the transistor Q18 is in the off state and the output of the second off-hook detecting section 7 is in the low state. However, when the telephone 3 is in the off-hook state, the transistor Q18 is in the on state, so that the output of the second off-hook detecting section 7 is in the high state. In this way, by monitoring the outputs of the first off-hook detecting section 5 and the second off-hook detecting section 7, the telephone 3 can detect on-hook or off-hook.

During the communication of the terminal network control device 1, when the off-hook of the telephone 3 is detected, the control unit 11 opens the data transmission / reception unit 10 for a predetermined time (for example, 3).
After a lapse of (second), the switching unit 6 is operated to connect the telephone connection terminal 4 to the first off-hook detection unit 5 side, that is, the telephone line 2 side so that the telephone 3 can be used.

[0009]

However, in the above-mentioned conventional structure, two off-hook detecting portions have to be provided, which causes a problem that the number of parts is increased and the cost is increased.

The present invention is to solve the above-mentioned problems. The off-hook of the telephone can be detected before and during the communication of the terminal network control device, and the ringing of the telephone can be prevented by transmitting the selection signal. It is intended to provide an inexpensive terminal network control device with a small number of points.

[0011]

In order to achieve the above-mentioned object, a terminal network control device of the present invention has a telephone connection terminal for connecting a line terminal device including a telephone, and between the telephone connection terminal and the telephone line. An off-hook detection unit that detects the off-hook of the connected telephone, a switch unit that disconnects the telephone connection terminal from the telephone line, a selection signal transmission unit that transmits a selection signal, and a switch unit when transmitting the selection signal to connect the telephone line to the telephone line. A control unit for controlling to disconnect from the terminal is provided.

[0012]

According to the present invention, the control unit uses the same off-hook detection unit to monitor the use or non-use of the telephone connected to the telephone connection terminal before calling or during data communication. Therefore, the telephone can be preferentially used, and when the control unit is transmitting the selection signal, the telephone is disconnected from the telephone line so that the bell of the telephone can be prevented from ringing by the selection signal transmitted by the selection signal transmitting unit. Become.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, the terminal network control device 21 is a telephone line 2
An incoming call detection unit 8 for detecting a call signal from the telephone, a data transmission / reception unit 10 for transmitting / receiving data, a telephone connection terminal 4 for connecting a communication device such as a telephone, a telephone connection terminal 4 and a telephone line 2. An off-hook detection unit 22 connected between the two to detect an off-hook of the telephone 3, a switch unit 23 for disconnecting the telephone connection terminal 4 from the telephone line 2, a selection signal transmission unit 9 for transmitting a selection signal, and a selection signal transmission. At times, it comprises a control unit 24 for controlling the switch unit 23 and controlling the disconnection of the telephone line 2 from the telephone connection terminal 4.

In the above structure, the incoming call detecting section 8, the selection signal transmitting section 9 and the data transmitting / receiving section 10 are the same as those in the conventional example, and therefore their explanations are omitted. Further, the circuit operation of the off-hook detecting section 22 is the same as the operation of the first off-hook detecting section of the conventional example, and therefore its explanation is omitted. The operation when the terminal network control device 21 makes a call operation will be described. When in the standby state, the switch unit 23 sets the telephone 3 to the off-hook detection unit 22.
Is connected to the telephone line 2 via. When the terminal network control device 21 is about to start making a call, it confirms that the telephone line 2 is idle as in the conventional example. To confirm that the telephone line 2 is idle, the control unit 2
Reference numeral 4 confirms input signals from the incoming call detection unit 8 and the off-hook detection unit 22. When the telephone line 2 is not in the idle state, it waits until it is in the idle state, and if it is in the idle state, it shifts to the selection signal sending operation. In the control unit 24, first, the switch unit 23
To disconnect the telephone 3 from the telephone line 2. Next, the selection signal sending unit 9 is controlled to send the selection signal to the telephone line. When the transmission of the selection signal is completed, the control unit 24 controls the switch unit 23 to connect the telephone 3 again to the telephone line 2 via the off-hook unit 22. Thus, during transmission of the selection signal, the telephone 3 is disconnected from the telephone line 2 to prevent the bell of the telephone 3 from ringing due to the selection signal transmitted from the terminal network control device 21. When the connection with the destination terminal is completed, the control unit 24 controls the data transmission / reception unit 10 to start data communication. Further, since the off-hook detection unit 22 is connected to the telephone 3 side during communication, when the telephone 3 performs the off-hook operation, the control unit 24 can detect the off-hook. When the off-hook of the telephone 3 is not detected during the data communication, the control unit 24 is operated after the data communication is completed.
Resets the data transmission / reception unit 10 to the open state and returns to the standby state. On the other hand, when the off-hook of the telephone 3 is detected during the data communication, the control unit 24 first controls the switch unit 23 to disconnect the telephone 3 from the telephone line 2 once. Next, the data transmitting / receiving unit 10 is opened. After the control section confirms that a certain time has passed, the switch section 23 is controlled to connect the telephone 3 to the telephone line 2 via the off-hook detection section 22. After this control, the telephone 3 can be used.

As described above, in the terminal network control device of the present invention, since the control unit 24 controls the switch unit 23 to disconnect the telephone 3 from the telephone line 2 when transmitting the selection signal, the selection transmitted from the selection signal transmitting unit 9 is performed. The ringing of the telephone 3 can be prevented by the signal, and the off-hook detection unit for detecting the use or non-use of the telephone 3 is shared before the selection signal is transmitted or during the data communication. The number of parts can be reduced, and the cost can be reduced.

[0016]

As described above, in the terminal network control apparatus of the present invention, the control unit controls the switch unit to disconnect the telephone from the telephone line when the selection signal is transmitted, so that the selection signal transmitted from the selection signal transmission unit is used. The bell of the telephone can be prevented from ringing, and the off-hook detector that detects whether the telephone is used or not is shared before the selection signal is sent or during data communication, so the telephone can be prioritized while reducing the number of parts. Therefore, there is an effect that the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of a terminal network control device according to an embodiment of the present invention.

FIG. 2 is a block configuration diagram of a conventional terminal network control device.

FIG. 3 is a diagram showing a voltage waveform of a telephone line when a selection signal is transmitted.

[Explanation of symbols]

 4 Telephone Connection Terminal 9 Selection Signal Sending Section 22 Off-Hook Detection Section 23 Switch Section 24 Control Section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaaki Sakata 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A telephone connection terminal for connecting a line terminal device including a telephone, an off-hook detection unit connected between the telephone connection terminal and a telephone line for detecting an off-hook of the line terminal device, and the telephone connection terminal. A terminal including a switch unit for disconnecting from the telephone line, a selection signal transmitting unit for transmitting a selection signal, and a control unit for controlling the switch unit at the time of transmitting the selection signal and controlling the telephone line to be disconnected from the telephone connection terminal. Network controller.