JPH05316173A - Terminal network controller - Google Patents

Abstract

PURPOSE:To minimize trouble onto a telephone set user by detecting automatically an improper connection of the telephone set connected to a telephone set connection terminal. CONSTITUTION:When a connection state of a telephone set connection terminal 4 is checked, a control section 15 controls a polarity inversion section 12 to change the polarity of a voltage applied to the telephone set connection terminal 4. Then a signal from a current detection section 11 is received to discriminate whether or not the telephone set connection terminal 4 is connected normally. When the wiring of the telephone set connection terminal 4 is disconnected, since nothing is connected between the telephone set connection terminal 4, the telephone set connection terminal 4 is kept open. In this case, even when the polarity inversion section 12 changes the polarity of the voltage of the telephone set connection terminal 4, since no closed loop is in existence, no current flows to the telephone set connection terminal 4, and then no current is detected by the current detection section 11. Thus, the connection state of the telephone set connection terminal 4 is judged and informed to the management company of a terminal equipment network controller 10 via a notice section 14.

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 connected to a telephone line and further connected with a terminal such as a telephone in a subsequent stage.

[0002]

2. Description of the Related Art A conventional terminal network control apparatus 1 is connected to a telephone line 2 as shown in FIG. 2 and a telephone connection terminal 4 for connecting a terminal such as a telephone (hereinafter, a telephone will be described as an example). Between the telephone line 2 and the telephone connection terminal 4, the disconnector 5 for manually disconnecting the terminal network control apparatus 1 when the terminal network control apparatus 1 fails and directly connecting the telephone line 2 and the telephone connection terminal 4 to each other. An off-hook detector 6 for detecting an off-hook of the telephone 3 connected to the telephone, an incoming call detector 7 for detecting a call signal from the telephone line 2, and a control for opening and closing the telephone line 2. The data transmission / reception unit 8 performs modulation / demodulation of a data signal, and a control unit 9 that receives signals from the off-hook detection unit 6 and the incoming call detection unit 7 and controls the data transmission / reception unit 8. Normal,
The disconnector is connected to the side connecting the terminal network control device 1 and the telephone line 2 as shown in FIG. 2, and disconnects the terminal network control device 1 only when an abnormality occurs.

The terminal network control device 1 operates as follows. When attempting to start a call, the control unit 9 first 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 that 1) the 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 confirms the input signals from the off-hook detection unit 6 and the incoming call detection unit 7. 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 9 first causes the data transmission / reception unit 8 to
And the telephone line 2 is closed, and after 3 seconds defined in the technical standard of the terminal equipment has elapsed, the selection signal is started to be transmitted.
When the connection with the destination terminal is completed, the control unit 9 controls the data transmission / reception unit 8 to start data communication. When the data communication ends, the control unit 9 first controls the data transmission / reception unit 8 to open the telephone line 2 and returns to the standby state.

The above-mentioned terminal network control device 1 is, for example, for automatic gas meter reading, and its management is performed by the gas company or N.
It is under TT. Therefore, the gas company or NTT will perform installation and maintenance in each home. And
The wiring company of the telephone connection terminal 4 for connecting the telephone line 2 and the telephone 3 is performed by the management company of the terminal network control device 1. Also,
When the inside of the terminal network control device 1 breaks down due to lightning or the like,
The switching device 5 is switched to disconnect the terminal network control device 1 from the telephone line 2.

[0005]

However, in the above-mentioned conventional configuration, when the telephone 3 is disconnected from the telephone connecting terminal 4 due to loosening of the mounting screw of the telephone connecting terminal 4 for connecting the telephone 3, Not only is the telephone set 3 unusable, but the management company does not know that the telephone connection terminal 4 is disconnected. Therefore, there is a problem that the telephone 3 cannot be used for a long period of time, and the home in which the terminal network control device 1 is installed is annoying.

The present invention solves the above-mentioned problems, and enables the terminal network control device 1 to automatically check the connection between the telephone set 3 and the terminal network control device 1 so that the administrator of the terminal network control device 1 can Side discovered the connection failure of the telephone 3 early,
The purpose is to minimize annoyance to telephone users.

[0007]

In order to achieve the above object, the present invention provides a telephone connection terminal for connecting a line terminal device including a telephone, and a current detector for detecting a current flowing between the telephone connection terminal and the telephone line. A polarity reversing unit that is connected to the telephone line side from the current detection unit and controls the polarity of the voltage applied to the telephone connection terminal; and a reception signal from the current detection unit and the operating state of the polarity reversing unit that is connected to the telephone connection terminal. The connection state determination unit that determines a poor connection of the line terminal device and the notification unit that receives a signal from the connection state determination unit and issues a notification are provided.

[0008]

According to the present invention, when checking the connection state of the telephone connection terminal, the control section controls the polarity reversing section to change the polarity of the voltage applied to the telephone connection terminal. Next, the signal from the current detector is received to determine whether the telephone connection terminal is normally connected. When the telephone is connected properly, the capacity of the bell circuit of the telephone is connected to the telephone connection terminal, so if the polarity reversing unit changes the polarity of the voltage of the telephone connection terminal, the A current flows through the current detector, and the current is detected by the current detector. On the other hand, when the wiring of the telephone connection terminal is disconnected, nothing is connected to both ends of the telephone connection terminal, and the telephone connection terminal is open. At this time, even if the polarity reversing unit changes the polarity of the voltage at the telephone connection terminal, no current flows through the telephone connection terminal because there is no closed loop, and therefore no current is detected by the current detection unit. According to the above rules, the connection status determination unit determines the connection status of the telephone connection terminal based on the operation status of the polarity reversal unit and the input signal from the current detection unit, and the connection status determination unit controls the terminal network via the notification unit. Notify the management company of the equipment.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, the same reference numerals as those in FIG. 2 indicate the same components, and thus the description thereof will be omitted. In FIG. 1, the terminal network control device 10 includes a current detection unit 11 that detects a current flowing between the telephone connection terminal 4 and the telephone line 2, and a current detection unit 11
The polarity reversing unit 12 connected to the telephone line 2 side to control the polarity of the voltage applied to the telephone connection terminal 4, and the reception signal from the current detection unit 11 and the operating state of the polarity reversing unit 12 are connected to the telephone connection terminal 4. The connection state determination unit 13 that determines a poor connection of the line terminal device, the notification unit 14 that receives a signal from the connection state determination unit 13 and issues a notification, and the signals from the current detection unit 11 and the incoming call detection unit 7 The control unit 15 receives and receives the data transmitting / receiving unit 8 and the polarity reversing unit 12.

In the above configuration, the control unit 15 is used at the time of calling.
Since the same control as in the conventional example is performed, the description thereof will be omitted. Hereinafter, a method in which the terminal network control device 1 detects a wire disconnection of the telephone 3 will be described. First, the operation when the telephone 3 is normally connected to the telephone connection terminal 4 will be described, and then the operation when the wiring of the telephone connection terminal 4 is disconnected will be described. When detecting disconnection of the telephone connection terminal 4, the control unit 15 first controls the polarity reversing unit 12 to invert the polarity of the voltage applied to the telephone connection terminal 4. When the telephone 3 is normally connected to the telephone connection terminal 4, the bell circuit in the telephone 3 is connected, and equivalently, the inductance L (number 1 in the figure).
7, the numbers in parentheses are the same as in the following figures) and the capacity C
(16) is connected. The control unit 15 has the polarity reversing unit 1
When 2 is operated and the polarity of the voltage applied to the telephone connection terminal 4 is reversed, the capacity C (16) in the telephone 3 is repeatedly charged and discharged. Due to this charging / discharging, a current flows through the current detection unit 11, and the current detection unit 11 detects the current. When the polarity reversing unit 12 is operating, the connection state determining unit 13 determines that the telephone connection terminal 4 is normally connected because a current also flows in the current detecting unit 11.

Next, the operation when the wiring of the telephone connection terminal 4 is disconnected will be described. The control unit 15 first controls the polarity reversing unit 12 to change the polarity of the voltage applied to the telephone connection terminal 4. However, since the telephone 3 of the telephone connection terminal 4 is detached, the telephone connection terminal 4 is the same as in the open state. That is, no current flows in the telephone connection terminal 4, so no current flows. As a result, no current is detected by the current detector 11. In the connection state determination unit 13, the polarity reversal unit 12 operates and the telephone connection terminal 4
Even though the polarity of the applied voltage is changed, it is determined that the telephone 3 is not normally connected to the telephone connection terminal 4 because no current flows in the current detector 11. Then, the connection state determination unit 13 outputs a notification signal to the notification unit 14, and the notification unit 14 notifies the management company of the terminal network control device 10 that the connection of the telephone 3 is defective.

As described above, according to the terminal network control device 10 of the present invention, the polarity reversing unit 12 changes the polarity of the voltage applied to the telephone connecting terminal 4, and the current detecting unit 11 detects the current flowing through the telephone 3. , The connection state determination unit 13 is the polarity reversal unit 1
The connection failure of the telephone connection terminal 4 is determined according to the input signal from the current detection unit 11 when 2 is operating, and the notification is sent to the management company of the terminal network control device 10 via the notification unit 14. As a result, not only the terminal network control device 10 can automatically detect the connection failure of the telephone connection terminal 4, but also it is possible to automatically notify the management company of the terminal network control device 10. .. In addition, since the connection failure of the telephone connection terminal 4 can be detected at an early stage, the management company of the terminal network control device 1 can quickly deal with it, and the trouble to the telephone user can be minimized. The effect is that you will be able to.

[0013]

As described above, in the terminal network control device of the present invention, the polarity reversing unit changes the polarity of the voltage applied to the telephone connection terminal, and the current detecting unit detects the current flowing through the telephone to determine the connection state. The unit determines the connection failure of the telephone connection terminal according to the input signal from the current detecting unit when the polarity reversing unit is operating, and notifies the management company of the terminal network control device via the notifying unit. As a result, not only the terminal network control device can automatically detect the connection failure of the telephone connection terminal, but also it is possible to automatically notify the management company of the terminal network control device. In addition, since the poor connection of the telephone connection terminal can be detected at an early stage, the management company of the terminal network control device can quickly deal with it, and the trouble to the telephone user can be minimized. The effect is that you will be able to.

[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.

[Explanation of symbols]

 10 terminal network control device 11 current detection unit 12 polarity reversal unit 13 connection state determination unit 14 reporting unit

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

Claims (2)

[Claims] 1. A telephone connection terminal for connecting a line terminal device including a telephone, a current detection unit for detecting a current flowing between the telephone connection terminal and a telephone line, and a connection connected to the telephone line side from the current detection unit, A polarity reversal unit that controls the polarity of the voltage applied to the telephone connection terminal, a received signal from the current detection unit, and an operation state of the polarity reversal unit to check connection failure of the line terminal device connected to the telephone connection terminal. A terminal network control device comprising a connection state determination unit for determination. 2. The terminal network control device according to claim 1, further comprising a reporting unit that receives a signal from the connection state determination unit and reports the signal.