JP2921257B2 - Terminal network controller - Google Patents

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 further connects a terminal such as a telephone at a subsequent stage.

[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 has a telephone connection terminal 4 for connecting a terminal such as a telephone (hereinafter, a telephone will be described as an example). When the terminal network control device 1 fails, the terminal network control device 1 is manually disconnected, and a disconnector 5 for directly connecting the telephone line 2 and the telephone connection terminal 4 is connected to the telephone line 2 and the telephone connection terminal 4. And an off-hook detecting unit 6 for detecting an off-hook of the telephone 3, an incoming call detecting unit 7 for detecting a call signal from the telephone line 2, and controlling the opening and closing of the telephone line 2. It comprises a data transmitting / receiving section 8 for modulating and demodulating a data signal, and a control section 9 for receiving signals from the off-hook detecting section 6 and the incoming call detecting section 7 and controlling the data transmitting / receiving section 8. Normal,
As shown in FIG. 2, the disconnecting device is connected to the side connecting the terminal network control device 1 and the telephone line 2, and disconnects the terminal network control device 1 only when an abnormality occurs.

[0005] The terminal network control device 1 operates as follows. When starting transmission, the control unit 9 first confirms that the telephone line 2 is not in use and is in an idle state, and then proceeds to a selection signal transmission operation.
The telephone line 2 being idle means a state in which 1) the telephone 3 is not used and 2) a call signal from the telephone line 2 has not arrived. In order to confirm the above 1) and 2), the control unit 9 confirms input signals from the off-hook detection unit 6 and the incoming call detection unit 7. If the telephone line 2 is not empty, the process waits until the telephone line 2 becomes empty, and if it is empty, the operation shifts to a selection signal transmitting operation. When transmitting the selection signal, the control unit 9 first transmits the data
, The telephone line 2 is closed, and after 3 seconds specified in the technical standards of the terminal device have elapsed, the selection signal starts to be transmitted.
When the connection with the destination terminal is completed, the control unit 9 controls the data transmission / reception unit 8 and starts data communication. When the data communication is completed, first, the control unit 9 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 is managed by a gas company or N
Under TT. Therefore, installation and maintenance in each home are performed by a gas company or NTT. And
The wiring work 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,
If the terminal network control device 1 fails due to lightning or the like,
The terminal network control device 1 can be disconnected from the telephone line 2 by switching the divider 5.

[0005]

However, in the above-mentioned conventional configuration, when the telephone 3 is disconnected from the telephone connection terminal 4 due to loosening of a screw of the telephone connection terminal 4 for connecting the telephone 3 or the like, Not only can the telephone 3 become unusable, but the management company does not know that the wiring of the telephone connection terminal 4 has been disconnected. For this reason, there has been a problem that the telephone 3 cannot be used for a long time, and the home to which the terminal network control device 1 is attached is troublesome.

[0006] The present invention solves the above-mentioned problems, and enables the terminal network control apparatus 1 to automatically confirm the connection between the telephone 3 and the terminal network control apparatus 1 so that the administrator of the terminal network control apparatus 1 can check the connection. Side detects the poor connection of the telephone 3 early,
The purpose is to minimize inconvenience 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 inversion unit connected to the telephone line side from the current detection unit to control the polarity of the voltage applied to the telephone connection terminal; A connection state determining unit that determines a connection failure of the line terminal device, and a reporting unit that receives a signal from the connection state determining unit and issues a report.

[0008]

According to the present invention, when the connection state of the telephone connection terminal is checked, the control unit controls the polarity inversion unit to change the polarity of the voltage applied to the telephone connection terminal. Next, a signal from the current detection unit is received to determine whether the telephone connection terminal is normally connected. When the telephone is normally connected, the capacitance of the bell circuit of the telephone is connected to the telephone connection terminal. Therefore, when the polarity inversion unit changes the polarity of the voltage of the telephone connection terminal, the capacitance of the telephone is reduced. , And the current is detected by the current detection unit. 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, so that the terminal is opened. 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 thus no current is detected by the current detection unit. According to the above rule, the connection state determination unit determines the connection state of the telephone connection terminal based on the operation state of the polarity inversion unit and the input signal from the current detection unit, and the connection state determination unit controls the terminal network via the notification unit. Notify the management company of the device.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, components having the same reference numerals as those in FIG. 2 indicate the same components, and a description thereof will be omitted. In FIG. 1, a terminal network control device 10 includes a current detection unit 11 for detecting a current flowing between the telephone connection terminal 4 and the telephone line 2, a current detection unit 11
A polarity reversing unit 12 connected to the telephone line 2 for controlling the polarity of the voltage applied to the telephone connection terminal 4; A connection state determination unit 13 that determines a connection failure of the line terminal device to be performed, a notification unit 14 that receives a signal from the connection state determination unit 13 and makes a report, and a signal from the current detection unit 11 and the incoming call detection unit 7 It comprises a data transmission / reception section 8 for receiving and controlling section 15 for controlling polarity inversion section 12.

[0010] In the above configuration, the control unit 15 at the time of transmission.
Performs the same control as in the conventional example, and a description thereof will be omitted. Hereinafter, a method in which the terminal network control device 1 detects the disconnection of the wiring 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 wiring of the telephone connection terminal 4, the control unit 15 first controls the polarity inversion 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 (the number 1 in the figure)
7, the numbers in parentheses indicate the numbers in the figure in the same manner) and the capacitance C
(16) is connected. The controller 15 is the polarity inverting unit 1
2 is operated to invert the polarity of the voltage applied to the telephone connection terminal 4, the capacitor C (16) in the telephone 3 repeats charging and discharging. The current flows to the current detection unit 11 by the charging and discharging, and the current detection unit 11 detects the current. The connection state determination unit 13 determines that the telephone connection terminal 4 is normally connected when the polarity inversion unit 12 is operating, because the current also flows through the current detection 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 inversion 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 disconnected, the telephone connection terminal 4 is the same as the open state. That is, no current flows in the telephone connection terminal 4 because there is no loop through which the current flows. As a result, no current is detected by the current detection unit 11. In the connection state determination unit 13, the polarity inversion unit 12 operates and the telephone connection terminal 4
It is determined that the telephone 3 is not properly connected to the telephone connection terminal 4 because no current flows through the current detection unit 11 despite the change in the polarity of the applied voltage of 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 connection terminal 4, and the current detection unit 11 detects the current flowing through the telephone 3. , The connection state determination unit 13 is the polarity inversion unit 1
In accordance with an input signal from the current detection unit 11 when the terminal 2 is operating, a connection failure of the telephone connection terminal 4 is determined, and a notification is made to the management company of the terminal network control device 10 via the notification unit 14. As a result, not only can the terminal network control device 10 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 found at an early stage, the management company of the terminal network control device 1 can quickly respond, and the trouble for the telephone user is minimized. There is an effect that it becomes possible to do.

[0013]

As described above, according to the terminal network control apparatus of the present invention, the polarity inversion section changes the polarity of the voltage applied to the telephone connection terminal, and the current detection section 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 detection unit when the polarity reversing unit operates, and notifies the management company of the terminal network control device via the notification unit. As a result, not only can the terminal network control device 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 connection failure of the telephone connection terminal can be found at an early stage, the management company of the terminal network control device can respond quickly, and the trouble for the telephone user can be minimized. It has the effect of being able to do so.

[Brief description of the 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 diagram of a conventional terminal network control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Terminal network control device 11 Current detection part 12 Polarity inversion part 13 Connection state judgment part 14 Notification part

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Masaaki Sakata 1006 Kazuma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-5-153269 (JP, A) 103954 (JP, U) Actually open 49-74106 (JP, U)

Claims (2)

(57) [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 the telephone line, and a current detection unit connected to the telephone line side from the current detection unit. A polarity inverting unit that controls the polarity of the voltage applied to the telephone connection terminal, and a connection failure of the line terminal device connected to the telephone connection terminal based on a reception signal from the current detection unit and an operation state of the polarity inversion unit. A terminal network control device comprising: a connection state determining unit for determining. 2. The terminal network control device according to claim 1, further comprising a report unit that receives a signal from the connection state determination unit and reports the signal.