JPH04115767A - Line terminal equipment - Google Patents

Abstract

PURPOSE:To reduce power consumption by supplying power only to a prescribed data transmission reception section in response to a data communication signal in a battery-driven line terminal equipment or the like. CONSTITUTION:No power is supplied to except a circuit block monitoring start of data communication in the standby state. When a network control section 5 receiving a call signal from a telephone line 1 outputs a prescribed output signal to a central control section 7 or a communication terminal equipment interface section 8 outputs a prescribed signal to the control section 7 based on a call request signal from a communication terminal equipment 3, the control section 7 outputs a prescribed signal to a power supply control section 10. Thus, power is supplied even to a data transmission reception section 6 and data communication is started. Upon the detection of a stop of a data signal, the control section 7 stops an output of a signal to the control section 10 to stop power supply to the transmission reception section 6. Thus, power is supplied to all the circuit blocks only at data communication in this way to reduce the power consumption.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a line terminal device that is connected to a telephone line and performs data communication using predetermined signals.

Conventional technology In recent years, with the spread of personal computer communications, an increasing number of households own line terminal equipment, but conventional line terminals are the most compact and low power consumption line terminal equipment required by gas companies and others for automatic meter reading. Terminal devices are not suitable.

Below, the fifth section will discuss the configuration of this type of conventional line terminal device.
This will be explained with reference to the figures.

As shown in the figure, a line terminal device 2 is connected to a telephone line 1 and a communication terminal device 3 and has a telephone connection terminal 4.The configuration of the line terminal device 2 will be explained below.
A communication unit that forms an interface between the network control unit 5 that detects a calling signal from the telephone line l, controls the termination of the telephone line, detects the polarity, etc., the data transmitting/receiving unit 6 that transmits and receives data signals, and the communication terminal device 3. Terminal interface section 8, network control section 5, and communication terminal device interface section 8
and a central control unit 7 that controls the data transmitting and receiving unit 6, a power supply unit 9 that constantly supplies power to all blocks including the network control unit 5, the data transmitting and receiving unit 6, the central control unit 7, and the communication terminal interface unit 8. It is composed of.

In the above configuration, the central control unit 7 connects the communication terminal device 3 and the telephone line 1 in response to a call request from the communication terminal device 3 or an incoming call signal from the telephone line 1 .

Problems to be Solved by the Invention The communication terminal device 3 connected to such a conventional line terminal device 2 is generally a personal computer, the frequency of use is not definite, and the communication time for - times is relatively long. ,
Furthermore, the communication terminal device 3 and the line terminal device 2 are installed indoors in most cases. Because the mode of use is uncertain and the place of use is limited to indoors, the conventional line terminal device 2 has been configured to use a commercial power source as its power source. Therefore, no structural improvements were necessary to reduce power consumption.

However, the usage of line terminal devices intended for automatic meter reading is extremely limited. The frequency of use is about once a month for meter reading, and the amount of data transmitted is small because the data transmitted is only meter readings.Furthermore, the installation location is close to gas meters, etc., so it is not suitable for outdoor installation. Become. Due to the limited usage pattern described above, line terminal equipment for automatic meter reading often uses batteries as a power source due to the frequency of use and ease of installation, resulting in lower costs and longer lifespans. Therefore, lower power consumption is required.

The present invention solves the above-mentioned problems, and includes, for example, a line terminal device that achieves low power consumption by supplying power only to a predetermined data transmitting/receiving section in accordance with a data communication signal in a battery-powered line terminal device. is intended to provide.

Means for Solving the Problems In order to achieve the above object, the present invention is configured as follows.

Claims 1 and 2 provide a network that is connected to a telephone line and includes a calling signal detection unit, a line closed circuit formation unit, a polarity detection unit, and a line switching unit that switches to the line terminal device side or the telephone side. A control unit, a data transmission/reception unit that transmits and receives predetermined signals, a communication terminal interface unit that configures an interface with the communication terminal device, a central control unit that controls the network control unit, the data transmission/reception unit, and the communication terminal interface unit, and a network control unit that controls the data transmission and reception unit and the communication terminal interface unit. It is composed of a power supply unit that supplies a predetermined power to a control unit, a data transmission/reception unit, a communication terminal interface unit, and a central control unit, and a ZRam unit that is controlled by the central control unit and controls power supply to at least the data transmission/reception unit. .

In claim 3, the data transmitting/receiving section includes a PB signal transmitting/receiving section that transmits and receives push button signals, and a modem section that transmits and receives predetermined modulation/demodulation signals.

In claim 4, at least the data transmitting/receiving section and the central control section are constituted by an integrated LSI.

Operation The present invention achieves low power consumption as follows by using the above-described configuration.

Claim 1 provides a configuration in which the central control unit controls power supply to the data transmitting/receiving unit, etc. in response to signal inputs from the network control unit, the communication terminal interface unit, and the data transmitting/receiving unit to the central control unit. This makes it possible to reduce power consumption.

In addition, in claim 2, in order to achieve low power consumption, voltage is always supplied to the network control section, communication terminal interface section, and central control section, and power is supplied to the data transmission and reception section only when transmitting and receiving data. By doing so, we aim to reduce power consumption.

In claim 3, since the data transmitting/receiving section is composed of a PB signal transmitting/receiving section that transmits and receives push button signals and a modem section that transmits and receives modulation/demodulation signals, either the PB signal or the modem signal can be transmitted. It is also possible to reduce power consumption in communications using .

In claim 4, at least the data transmitting/receiving section and the central control section are integrated and implemented as an LSI, thereby achieving further reduction in power consumption and miniaturization.

Embodiment First, an embodiment of claims 1 and 2 will be described with reference to FIG. 1. As shown in FIG. 0, a line terminal device 2 is connected to a telephone line 1 and a line termination device 3. It also has telephone connection terminal 4.

The line terminal device 2 is connected to the telephone line 1 and includes a ring signal detection section, a closed circuit formation section for the telephone line l, a polarity detection section, a line switching section for switching to the line terminal device side or the telephone side, etc., and a network control section 5; A data transmitting and receiving unit 6 that transmits and receives predetermined signals, a communication terminal interface unit 3 that configures an interface with the communication terminal device 3, and a central control unit 7 that controls the network control unit 5, the data transmitting and receiving unit 6, and the communication terminal interface unit 8. and the network control section 5, the data transmitting/receiving section 6, the communication terminal interface section 8, and the central control section 7.
When there is no predetermined signal input, power is supplied to the network control section 5, communication terminal interface section 8, and central control section 7. When there is a predetermined signal input, power is supplied to the network control section 5, the communication terminal interface section 8, and the central control section 7. Also X on the data transmitter/receiver part
and a power supply control section 10 that supplies S.

Next, the operation in the above configuration will be explained.

First, the standby state will be explained. In the standby state, there is no call signal from the telephone line l to the network control unit 5, so the network control unit 5 does not output a predetermined signal to the central control unit 7, and there is no call request signal from the communication terminal device 3, so communication is not possible. The terminal interface section 8 does not output a predetermined signal to the central control section 7. Since there is no predetermined signal input from either the network control section 5 or the communication terminal interface section 8 in the central control section 7, the predetermined signal is not output to the power supply control section 10. Therefore, the power supply control section 10 does not supply power to the data transmission/reception section 6.

Therefore, in the standby state, power is not supplied to any circuit block other than the circuit block that monitors the start of data communication, resulting in a minimum power consumption state.

Next, operations during data communication will be explained.

When the network control unit 5, which has received the calling signal from the telephone line l, outputs a predetermined output signal to the central control unit 7,
Alternatively, when the communication terminal interface section 8 outputs a predetermined signal to the central control section 7 in response to a transmission request signal from the communication terminal device 3, the central control section 7 detects the presence of the predetermined signal input and sends the predetermined signal to the power supply control section IO. Output a signal.

As a result, power is also supplied to the data transmitting/receiving section 6, making data communication possible. When data communication is started, the central control unit 7 monitors data between the data transmitting/receiving unit 6 and the communication terminal interface unit 8.

When the central control section 7 detects that the monitored data signal has stopped, the central control section 7 stops outputting a predetermined signal to the power supply control section 1o and stops supplying power to the data transmitting/receiving section 6. In this way, power consumption is reduced by supplying power only to the circuit blocks necessary for detecting the start of data communication during standby and supplying power to all circuit blocks only during data communication.

Next, claim 3 will be explained with reference to FIGS. 2 and 3. A 0-line terminal device 2, a telephone line 1 and a line termination device similar to claims 1 and 2. 3 and also has a terminal 4 for connecting a telephone.

The components of the line terminal device 2 are the same as those in claims 1 and 2 except for the data transmitter/receiver 6. The data transmitting and receiving unit 6 includes a PB signal transmitting and receiving unit 61 that transmits and receives push button signals, and a modem unit 62 that transmits and receives modulation and demodulation signals.
The power supply to each of the devices comprising the above can be independently controlled by the power supply control section 10.

Next, the circuit operation when using NTT's no-ringing communication service in the above configuration will be explained.

FIG. 3 shows a communication sequence when using a no-ringing communication service. In the standby state, as in claims 1 and 2, there is no predetermined output signal from the network control unit 5 and the communication terminal interface unit 8 to the central control unit 7, so the central control unit 7 The specified signal is not output to. That is, power is supplied to the network control section 5, central control section 7, and communication terminal interface 8 in the line terminal device 2, but power is not supplied to the data transmission section 6, so that power consumption is the minimum necessary.

Next, the operation when receiving a no-ringing call will be explained based on FIG. When a line terminal device (not shown) of a gas company or the like sends a selection signal to perform no-ringing communication with the line terminal device 2, the no-linking trunk reverses the polarity of the telephone line.

When the network control section 5 detects polarity reversal, it outputs a predetermined signal to the central control section 7. When the central control unit 7 receives this predetermined signal, it sends a signal to the power supply control unit 10 to prompt the FB signal transmission/reception unit 61 to supply power so that it can receive the NR3 signal sent from the no-ringing trunk. . N sent out from this no-ringing trunk
The R5 signal has the same frequency as the push button signal used in ordinary telephones, and has the function of indicating which line terminal device among the line terminal devices that can be installed on a line is called. It's a call signal.

If the NR3 signal is received and the calling signal does not match the calling signal registered in advance in the line terminal device 2, the central control unit 7 determines that another of the plurality of line terminal devices has been called and responds. Stop sending signals.

Then, in order to stop the power supply to the PB signal transmission/reception unit 61, the central control unit 7 stops outputting a predetermined signal to the power supply control unit 10, and returns to the standby state.

On the other hand, when the NR3 signal is received and the calling signal matches the calling signal registered in advance in the line terminal device 2,
The central control unit 7 is a PB signal transmitting/receiving unit 61 which is an AN of the PB signal.
This is a response signal to the calling signal, and if the zero-order data transmission signal to which "#" of the PB signal is assigned is a modulation/demodulation signal using a modem, control is performed to send the S signal. The unit 7 prompts the power supply control unit 10 to stop the power supply to the PB signal transmission/reception unit 61.

At the same time, the central control section 7 outputs a predetermined signal to the power supply control section 10 and supplies power to the modem section 62 in order to perform data communication. The unit 7 monitors the data signal, and when it detects the end of data communication due to the stop of the data signal, it stops outputting a predetermined signal to the power supply control unit 10 so as to stop the power supply to the modem unit 62, and enters a standby state. return. Note that the data communication signal may be a PB signal, and in that case, even after the ANS signal is sent, power is supplied to the PBB signal sending section, but power is not supplied to the modem section.

In this way, by further subdividing the data transmitting/receiving section and supplying the minimum necessary power, it is possible to further reduce power consumption.

Finally, Claim 4 will be explained with reference to FIG. 4. The components in FIG. 4 are the same as those in claims 1 and 2, but the data transmitting and receiving unit 6
The difference is that the central control unit 7 is integrated into an LSIII, but the operation is the same as in claims 1 and 2.

By using an LSI, the circuit inside the LSI can be rationalized, power consumption can be reduced, and the size can be reduced.

Effects of the invention As is clear from the above embodiments, the scope of claim 1
In claim 2, power consumption is reduced by partially applying power to the line terminal device, and in claim 2, power is applied to the data transmitting/receiving unit only during data communication. By doing so, we aim to reduce power consumption.

Furthermore, in claim 3, the data transmitting/receiving section is further subdivided and the ii source is applied only to the corresponding circuit block that transmits/receives a predetermined signal, thereby achieving low power consumption. In claim 4, the absolute amount of power consumption is reduced by integrating the data transmitting/receiving section and the central control section. From the above, it is possible to realize a small line terminal device with low power consumption that can be used for automatic gas meter reading, etc.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a line terminal device according to an embodiment of the present invention, FIG. 2 is a block diagram of a line terminal device according to another embodiment of the present invention, and FIG. 3 is a connection sequence diagram of a no-ringing communication service. FIG. 4 is a block diagram of a line terminal device according to another embodiment, and FIG. 5 is a block diagram of a conventional line terminal device. 1...IT talk line, 2...m terminal device, 3...communication terminal device, 4...telephone connection terminal, 5... ...Network control unit, 6...
Data transmission/reception unit, 7...Central control unit, 8...
...Communication terminal interface unit, 9...Power supply unit, 10...Power control unit, 11...
LSI.

Claims (4)

[Claims] (1) Sending and receiving a predetermined signal with a network control unit connected to a telephone line and having a calling signal detection unit, a closed circuit formation unit for the line, a polarity detection unit, a line switching unit for switching to the line terminal device side or the telephone side, etc. a data transmitting/receiving section, a communication terminal interface section configuring an interface with a communication terminal device, a central control section controlling the network control section, the data transmitting/receiving section, and the communication terminal interface section;
a power supply section that supplies predetermined power to the network control section, the data transmission and reception section, the communication terminal interface section, and the central control section; a power supply that is controlled by the central control section and controls power supply to at least the data transmission and reception section; A line terminal device consisting of a control section. (2) The line terminal device according to claim 1, comprising a power supply control section that is controlled to supply a predetermined power to the data transmission and reception section only in the data transmission and reception mode. (3) In the data transmitting/receiving section, which includes at least a PB signal transmitting/receiving section that transmits and receives telephone line push button signals, and a modem section that transmits and receives predetermined modulation/demodulation signals,
2. The line terminal device according to claim 1, further comprising a power control section that is controlled to supply power to the PB signal transmitting/receiving section during B signal transmission/reception and to supply power to the modem section during modulation/demodulation signal transmission/reception. (4) The line terminal device according to claim 1, wherein at least the data transmitting/receiving section and the central control section are formed of an integrated LSI.