JPH11177710A - Line terminal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To report to a center side and to avoid a telephone set on a user side from becoming inoperable, when a battery is consumed. SOLUTION: When a load part 15 is supplied, a battery voltage drop detecting part 9 detects a voltage drop and sends a drop discriminating signal to a report requesting part 10. The part 10 executes a reporting request to a central control part 19, which issued information on the battery voltage drop. Even when the battery is consumed further and a second load part 16 with a load smaller than the part 15 is supplied, a reporting-stop requesting part 18 requests the stoppage of notification to the part 19 at detecting of the voltage drop by the part 9. Thereafter, the part 19 stops notifying operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line terminal device for transferring data between a data terminal device and a central monitoring device or a home controller by a no-ringing communication service or a terminal calling system using an existing general public line network. It is about.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, this type of line terminal device is connected to a telephone line 1, a telephone 2, and a data terminal device 3 such as a gas meter with a communication function. The line terminal device 4 connects the telephone 2 to the telephone line 1 or performs network control at the time of no ringing communication or at the time of calling a terminal, and demodulates an analog signal from the telephone line 1 into a digital signal. And a signal transmission unit 6 for modulating a digital signal from the data terminal device 3 into an analog signal and sending the analog signal to the telephone line 1.

A central control unit 7 for instructing the network control unit 5 to connect to a line and for controlling the signal transmission unit 6, a battery 8 serving as a power source for the circuit, and a battery voltage drop for determining a decrease in the voltage level of the battery 8 The detection unit 9 and the load control unit 14
When the battery voltage drop detecting section 9 detects a drop in the voltage level of the battery 8 in a state in which the battery 5 is in an active state, the battery voltage drop detecting section 9 issues a report request to the central control device 7.

The network control unit 5 connects the telephone 2 to the telephone line 1
A coil relay 11 for connecting to and disconnecting from a telephone line is composed of a line switching unit 12 as a main component, and a line terminating unit 13 for performing impedance matching with the telephone line 1 and opening and closing a DC loop. .

Next, the operation of the line terminal device 4 will be described. The notification operation of the line terminal device 4 is performed by receiving a start-up message from the data terminal device 3, or after the load control unit 14 activates the load 15 by a periodic check from the central control unit 7, and then the battery voltage drops. When the detection unit 9 detects a low battery voltage, the process starts when a notification request is issued from the notification request unit 10.

For example, upon detection of a decrease in battery voltage, the central control unit 7 having received the notification request controls the coil relay 11 of the line switching unit 12 to disconnect the telephone 2 from the telephone line 1. Next, the line termination unit 13 is controlled to set the line impedance to a closed state, and dialing is started. After dialing, communication with the central monitoring center is performed via the signal transmission unit 6. After the communication is completed, the line impedance control of the line termination unit 13 is released, and then the coil relay 11 of the line switching unit 12 is returned to the original state, and the telephone 2 is connected to the telephone line 1.

As described above, the central control unit 7 controls the network control unit 5 and the signal transmission unit 6, and transmits the information of the data terminal device 3 and the information of the voltage drop of the battery 8 to the central monitoring center or the like.
Was sent through.

[0008]

However, in the above-described configuration, the frequency of the communication of the line terminal device 4 becomes larger than expected, or the circuit current increases due to aging or failure of the circuit. 8 may wear out quickly.

When the battery voltage drops, the line terminal device 4 detects the battery voltage drop and attempts to report the battery voltage drop. If the battery drop cannot be reported due to a trouble of the central monitoring device or a busy state, the redial of the battery voltage drop report is made. Is performed many times. Also, even if you can report a low battery,
General communication operations are continuously performed until the maintenance is performed.

If the battery is left in this state, the battery voltage becomes lower than the operating voltage of the circuit, the operation is stopped during the communication operation, and the line is closed or the telephone terminal is disconnected from the line. Therefore, there is a problem that the user's telephone cannot be used.

[0011]

In order to solve the above-mentioned problems, the present invention provides a battery as a power supply, a load as a load supplied to the battery, a load controller for controlling the supply of the load,
A second load unit having a load smaller than the load unit, a second load control unit that controls supply of the second load unit, a battery voltage drop detection unit that determines a battery voltage drop state, and a load control unit. A notification request unit that outputs a notification request for a low battery when a low battery voltage is detected by the low battery voltage detection unit when the load unit is supplied, and a low battery voltage when the second load unit is supplied by the second load control unit. A notification stop request unit that outputs a notification stop request to stop a notification operation when a battery voltage drop is detected by the detection unit; a central control unit that performs notification control according to a request from the notification request unit and the notification stop request unit; It has a network control unit for controlling a telephone line by a control signal from the unit and a signal transmission unit for transmitting and receiving signals between the telephone lines.

According to the above invention, when the battery voltage gradually decreases, the battery voltage drop detection unit does not detect the drop even if the second load unit is supplied when determining the battery voltage drop.
When the load unit is supplied, a state of detecting a drop occurs. At this time, a drop determination signal is sent from the battery voltage drop detection unit to the notification request unit. The report request unit issues a report request to the central control unit based on the decrease determination signal. The central control unit having received the report request controls the network control unit to report the information of the battery voltage drop via the signal transmission unit. When the battery voltage further decreases, even when the second load unit having a smaller load than the load unit is supplied, the battery voltage decrease detection unit detects the decrease. At this time, a decrease determination signal is sent from the battery voltage decrease detection unit to the notification stop request unit. The notification stop requesting unit issues a notification stop request to the central control unit based on the decrease determination signal. The central control unit that has received the report stop request will stop the report operation thereafter, so stop the operation while closing the line impedance of the network control unit during communication or disconnecting the telephone from the line during communication. No more.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A terminal device according to the present invention comprises a battery serving as a power supply, a load unit serving as a load supplied to the battery, a load control unit controlling supply of the load, and a load smaller than the load unit. A second load unit, and a second load unit that controls the supply of the second load unit.
A load control unit, a battery voltage drop detection unit that determines a battery voltage drop state, and a battery drop notification request when a battery voltage drop detection unit detects a battery voltage drop when the load unit is supplied by the load control unit. A notification request unit for outputting a notification stop request unit for outputting a notification stop request to stop a notification operation when the battery voltage drop detection unit detects a battery voltage drop when the second load unit is supplied by the second load control unit. And a central control unit that performs notification control according to requests from the report request unit and the report stop request unit, and performs signal transmission and reception between the telephone line and a network control unit that controls a telephone line based on a control signal from the central control unit. And a signal transmission unit. Since the battery consumption can be detected by setting the load to two when determining the state of the battery voltage drop, when the battery voltage drop is detected only when a large load is supplied, the battery voltage drop is notified. Informs the central monitoring center of the battery voltage drop information, and further detects the battery voltage drop even when the battery is running down and the smaller load is supplied. Therefore, it is possible to prevent the operation from being stopped in a state where the user's telephone or telephone line cannot be used.

[0014] Further, it has a load section having a signal transmission section as a load, and a second load section having a line termination section as a second load. The load is replaced with the load by using two types of conventional components and making them active. Therefore, it is not necessary to newly provide a pseudo load, and a line terminal device can be realized at low cost.

Further, there is provided an incoming call operation stop requesting unit for stopping the incoming call operation when the battery voltage drop detecting unit detects the battery voltage drop when the second load unit is supplied with the second load unit. At the end of battery consumption, the incoming call operation also stops, so line control for communication starting from the incoming call does not start, so the circuit becomes inoperable during communication due to the incoming call and stops operating in a state where the user's telephone can not be used Can be prevented.

Further, there is provided an overall operation stop requesting unit for stopping all operations when the battery voltage drop detecting unit detects the battery voltage drop when the second load unit is supplied with the second load unit. In addition, when the battery is exhausted, not only communication by notification or incoming call but also all controls are not performed, so that power consumption can be minimized. Therefore, the time during which the line terminal device decreases to the battery voltage at which the line terminal device cannot be controlled can be extended.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

(Embodiment 1) FIG. 1 is a block diagram of a line terminal apparatus according to Embodiment 1 of the present invention. Components having the same numbers as those in FIG. 5 are components having the same functions. In the figure, 1 is a telephone line, 2 is a telephone, 3 is a data terminal device, and a line terminal device 20 is a network control unit 5 and a signal transmission unit 6.
, Central control unit 19, battery 8, battery voltage drop detection unit 9, notification request unit 10, load unit 15, load control unit 1
4 and the second load unit 1 having a smaller load than the load unit 15
6.

Further, a second control section for controlling the second load section 16 is provided.
When the battery voltage drop detecting unit 9 detects a battery voltage drop when the second load unit 16 is supplied by the load control unit 17 and the second load control unit 17, a report stop request is output to stop the report operation. And a request unit 18.
Here, the battery voltage drop detection unit 9 is set to detect a battery voltage drop at a voltage level that does not fall below the minimum circuit operation voltage.

Since the load of the second load unit 16 is smaller than that of the load unit 15, the battery voltage drops when the load unit 15 is applied, but the battery voltage drops when the second load unit 16 is applied. The difference between the battery consumption level that does not cause the battery consumption level and the battery consumption level that causes the battery voltage reduction level even when the second load unit 16 is applied can be differentiated to change the battery voltage reduction process.

According to the present invention, when the central control unit 19 receives a startup message composed of a telephone number from the data terminal device 3 and receives the message, the coil relay 11 of the line switching unit 12 is controlled, and 2 is disconnected from telephone line 1. Next, the line termination unit 13 is controlled to set the line impedance to a closed state, and dialing is started. After dialing is completed, communication between the data terminal device 3 and the central monitoring center is performed via the signal transmission unit 6. After the communication is completed, the line impedance control of the line termination unit 13 is released, and then the coil relay 11 of the line switching unit 12 is returned to the original state, and the telephone 2 is connected to the telephone line 1.

While such communication is being performed, the frequency of the number of communication times of the line terminal device becomes larger than expected,
The circuit current may increase due to aging or failure of the circuit, and the battery 8 may be quickly consumed. The central control unit 19 normally checks the battery voltage on a regular basis. However, when the consumption of the battery 8 progresses and the battery voltage decreases, first, the second load unit 16 which is smaller than the load unit 15 is supplied. When done,
The battery consumption is such that the battery voltage does not drop, and the battery voltage drops when the load unit 15 is supplied by the load control unit 14, and the battery consumption level is detected by the battery voltage drop detection unit 9.

At this point, the battery voltage drop detecting section 9 sends a drop judging signal to the report requesting section 10. Report request unit 1
0 makes a report request to the central control unit 19 based on this decrease determination signal. Upon receiving the report request, the central control unit 19 controls the network control unit 5 to control the network control unit 5 and report the battery voltage drop information to the central monitoring center via the telephone line 1.

After connecting the line to the central monitoring center,
It notifies via the signal transmission section 6 that the battery voltage has dropped. If the line terminal device 20 is left installed in this state, the battery is further consumed and the battery voltage is reduced. The central control unit 19 performs the second communication immediately before starting the communication operation.
Even when the load section 16 is supplied by the second load control section 17, the degree of battery consumption for detecting a decrease in battery voltage is detected. The degree of battery consumption at this point corresponds to the last stage of the battery capacity.

At this time, the battery voltage drop detecting section 9 sends a drop judging signal to the report stop requesting section 18. Report stop request unit 1
8 issues a request to the central control unit 19 to stop the report in response to the decrease determination signal. Central control unit 19 that has received the report stop request
Stops the reporting operation. Therefore, the battery is further consumed, and communication is performed in a state where the battery voltage is further reduced to become equal to or lower than the operating voltage of the circuit, so that the line termination unit 13 of the network control unit 5 keeps the line impedance closed or controlled. It is possible to prevent the switching unit 12 from stopping the operation while the telephone 2 is disconnected from the telephone line 1.

As described above, in the line terminal device 20 which detects a low battery and performs a notification operation, it is assumed that the central monitoring center does not receive the notification of the low battery due to an unexpected factor such as a busy or a failure or can report the low battery. Also, if the replacement of the line terminal device is delayed, the communication operation is continued even when the battery 8 is further consumed and becomes lower than the minimum operating voltage of the circuit, thereby adversely affecting the telephone lines 1 and 2. However, this can be avoided by having two battery reduction / consumption judgment levels and two processes.

(Embodiment 2) FIG. 2 is a block diagram of a line terminal apparatus according to Embodiment 2 of the present invention. Here, the load unit 1
Reference numeral 5 denotes a signal transmission unit 6, and a second load unit 16 includes a line termination unit 13
And use it in common. That is, the load control unit 14 controlled by the central control unit 21 supplies power and sets the duplex mode to the full-duplex answer mode so as to activate the modem function of the signal transmission unit 6 to apply a load to the battery 8. . The second load section 16 applies a load to the battery 8 by closing the DC loop of the line terminating section 13.

Therefore, it is not necessary to newly add a circuit or a component such as a dummy load to provide the load unit 15 and the second load unit 16, and the line terminal device 22 can be configured simply and inexpensively.

(Embodiment 3) FIG. 3 is a block diagram of a line terminal apparatus according to Embodiment 3 of the present invention. Normally, since the line terminal device 25 is called from the central monitoring center, after the polarity inversion occurs on the telephone line 1, the NRS signal is used for the call using the no ringing service, and the 16 Hz call signal is used for the ringing system. The state is detected by the control unit 5, and the line termination unit 13 makes a semi-closed connection in order to match the line impedance.

However, if communication is continued even though the battery 8 is consumed and the battery voltage is reduced, the operation may be stopped in a semi-closed state. In some cases, communication devices that respond to various calls are connected in place of the telephone 2, and when such devices are connected, the coil relay 11 is controlled to be open by the line switching unit 12 during communication, The line terminal device 25 is prevented from affecting during communication. Therefore, if the battery 8 is consumed and further progressed, the communication device may remain disconnected from the telephone line 1 and become unusable.

Therefore, when the second load control unit 17 applies the load of the second load unit 16 to the battery 8, the battery voltage drop detection unit 9
The central control unit 24 prevents the incoming call stop requesting unit 23 from going to the incoming call operation in addition to the notification operation when detecting a decrease in
By sending the instruction to, even if the consumption of the battery 8 progresses, it becomes lower than the minimum operating voltage of the circuit during the communication due to the incoming call, and the operation does not stop in the semi-closed state or the open state of the coil relay.

(Embodiment 4) FIG. 4 is a block diagram of a line terminal apparatus according to Embodiment 4 of the present invention. In this embodiment, when the battery voltage drop is detected when the second load unit is supplied to the battery 8, a signal is input to the all-operation stop request unit 26, and the central control unit 27 performs By not only stopping incoming calls but also stopping all actions immediately,
Thereafter, by minimizing the power consumption of the line terminal device 28, the time until the voltage drops below the minimum operating voltage of the circuit can be maximized.

[0033]

As apparent from the above description, the following effects can be obtained according to the line terminal apparatus of the present invention.

(1) According to the first aspect, it is possible to detect the degree of consumption of the battery by using two loads when judging the state of decrease in the voltage of the battery. Therefore, when the battery voltage drop is detected only when a large load is supplied, the battery voltage drop is notified and the battery voltage drop information is notified to the central monitoring center. By stopping the notification operation after detecting the voltage drop, it is possible to prevent the operation from stopping in a state where the circuit becomes inoperable during communication and the user's telephone or telephone line becomes unusable.

(2) According to the second aspect, a pseudo load is newly formed by using two types of components provided conventionally and making them active so as to substitute for the load. Since there is no need to provide the line terminal device, a simple and inexpensive line terminal device can be realized.

(3) According to the third aspect, the incoming call operation is stopped at the end of battery exhaustion, so that line control for communication starting from the incoming call is not started, so that the circuit becomes inoperable during communication by incoming call. The operation can be prevented from being stopped in a state where the user's telephone cannot be used.

(4) According to the fourth aspect, when the battery is exhausted, not only communication by notification and incoming call but also all controls are not performed, so that power consumption can be minimized. Therefore, the time during which the line terminal device decreases to the battery voltage at which the line terminal device cannot be controlled can be extended.

[Brief description of the drawings]

FIG. 1 is a block diagram of a line terminal device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a line terminal device according to a second embodiment of the present invention;

FIG. 3 is a block diagram of a line terminal device according to a third embodiment of the present invention.

FIG. 4 is a block diagram of a line terminal device according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram of a conventional line terminal device.

[Explanation of symbols]

 Reference Signs List 5 Network control unit 6 Signal transmission unit 8 Battery 9 Low battery voltage detection unit 10 Report request unit 14 Load control unit 15 Load unit 16 Second load unit 17 Second load control unit 18 Report stop request unit 19, 21, 24, 27 Central control unit 23 Incoming call stop request unit 26 All operation stop request unit

Claims (4)

[Claims] 1. A battery serving as a power supply, a load serving as a load supplied to the battery, a load controller controlling the supply of the load, and a second load serving as a load smaller than the load. A second load control unit that controls the supply of the second load unit, a battery voltage drop detection unit that determines a reduced voltage state of the battery, and a battery voltage when the load unit is supplied by the load control unit. A report requesting unit that outputs a report request for a battery drop when the battery voltage drop is detected by the drop detection unit;
A notification stop request unit that outputs a notification stop request to stop a notification operation when the battery voltage drop detection unit detects a low battery voltage when the second load unit is supplied by the load control unit; and the notification request unit. And a central control unit for performing report control in response to a request from the report stop request unit; a signal transmission unit for transmitting and receiving signals between the telephone line and a network control unit for controlling a telephone line based on a control signal from the central control unit And a line terminal device. 2. The line terminal device according to claim 1, further comprising a load unit having a signal transmission unit as a load, and a second load unit having a line termination unit as a second load. 3. An incoming call stop requesting unit for stopping an incoming call operation when a battery voltage drop is detected by a battery voltage drop detecting unit when the second load unit is supplied with the second load unit. Line terminal equipment. 4. An all-operation stop requesting unit for stopping all operations when the battery voltage drop detecting unit detects a battery voltage drop when the second load unit is supplied with the second load unit. Line terminal equipment.