JPH0818681A - Line terminal equipment - Google Patents

Abstract

PURPOSE:To provide a line terminal equipment making an automatic dial originating call by the request from a center side and not calling a received by preventing a bell from ringing for an incoming of the request from the center. CONSTITUTION:The device is provided with a detection means 20 which detects a silent incoming of the facsimile communication network, automatic dial means 13 or 14 which makes a telephone communication call to the telephone line with the telephone number stored in advance, and line opening means which opens the facsimile communication connection in the lapse of the detection of the silent incoming according to the detection output signal of the silent incoming of the detection means 20. After the prescribed time of the operation of the line opening means, the automatic dial means 13 or 14 is started.

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 connected to a telephone line.

[0002]

2. Description of the Related Art For example, when investigating a consumption amount of propane gas provided in a user's house, a method in which a meter reader surveys a gas meter attached to a gas cylinder requires a lot of labor and time. 2. Description of the Related Art Conventionally, a line terminal device has been provided which informs a meter reading center side of gas consumption through.

When a meter-reading request is made, this line terminal device automatically dials a meter-reading center and transmits meter information, that is, consumption information. In this case, as a method of generating the meter-reading request, there are a method of transmitting the meter-reading request from the meter-reading center side to the line terminal device and a method of generating the meter-reading request by the line terminal device side by itself at a constant cycle.

[0004]

However, in the case of the method of sending the meter-reading request from the meter-reading center to the line terminal device, the bell rings when the line-terminal device is called from the meter-reading center side, so the receiver However, there is a problem in that it is called every time a request for meter reading from the center arrives.

Therefore, in a method of sending a meter-reading request from the meter-reading center to the line terminal device, there is a method using a no-ringing (no ringing) communication service. This is because when a subscriber of this service makes a call, an exchange corresponding to this service switches the NRS (No Ringin) of 2080 Hz.
g Selection) signal to make an incoming call to the other party.
A functional circuit for receiving an incoming call without ringing a bell when an NRS signal of Hz is received is provided.

[0006] However, this no-ringing communication service has a problem that the usage fee is high and that the exchanges corresponding to the service are currently limited to a limited area, and the use of the service is locally restricted. .

On the other hand, in the case of the method of transmitting the information on the consumption amount to the center side by transmitting from the line terminal side at a fixed cycle, the problem that the receiver is called by the ringing of the bell does not occur. However, there is a problem that the center side cannot call and control the line terminal device.

An object of the present invention is to provide a line terminal device which eliminates the above-mentioned problems.

[0009]

The present invention takes advantage of the fact that, in a facsimile communication network service, one of the functions on the network side is a function that enables an automatic incoming call while the telephone is not ringing. That is, in the facsimile communication network service, in order to make an automatic incoming call with the telephone ringing,
A 1300 Hz tone signal called an NCNG (No Ringing Calling Tone) signal is generated by the exchange and transmitted to the called side. The exchange of the facsimile communication network also sends a calling terminal identification signal, which is an identification signal of the calling side, to the called side.

The line terminal device according to the invention described in claim 1 uses the signal of the non-ringing incoming call of the above-mentioned facsimile communication network. Detecting means 23 for detecting a ringing incoming call, automatic dial means 13 or 14 for making a telephone communication call to the above-mentioned telephone line with a pre-stored telephone number, and responding to the detection output signal of the above-mentioned non-ringing incoming call of the detecting means 23. A line opening means 24 for opening the facsimile communication connection after a fixed time has passed after the detection of the non-ringing incoming call,
And a start-up means 17 for starting the above-mentioned automatic dial means after a fixed time has passed after the operation of the line opening means 24.

Further, the line terminal device according to the invention of claim 2 uses the signal of the ringing-free incoming call of the facsimile communication network and the calling terminal identification signal, and the ringing-free incoming call of the facsimile communication network is used. A detecting means 23 for detecting whether the calling terminal identification signal sent from the facsimile communication network coincides with a pre-registered calling terminal identification signal, and a judging means 24 stored in advance. In response to the automatic dialing means 13 or 14 for making a telephone communication call to the above-mentioned telephone line, the detection output signal of the non-ringing incoming call of the detecting means 23, and the judgment output of the judging means 24, the facsimile communication A line opening means 24 for opening the connection and an activation means 17 for activating the automatic dialing means after a fixed period of time of the operation of the line opening means 24 are provided. To.

[0012]

For example, when a call is made to the line terminal device according to claim 1 from the center side which performs gas meter reading, using the facsimile communication network service, the line terminal device receives an incoming call by the NCNG signal. Be seen. Therefore, the bell does not ring in the response means such as a telephone connected to the telephone line.

When the detecting means 23 detects the NCNG signal, the line terminal device according to the first aspect detects this as a notification request from the center side, and the means 24
Opens the facsimile communication connection. Then, after the fixed period of time, the activation means 17 activates the automatic dial means 13 or 14 to notify the center side.

In the line terminal device according to the second aspect, when the detecting means 23 detects the NCNG signal, the means 24 determines whether or not the calling terminal identification signal indicates the center side. When the calling terminal identification signal indicates the center side, the facsimile communication connection is released. Then, after a certain period of time, the activation means 1
7 activates the automatic dialing means to notify the center side. Therefore, it is possible to prevent the line terminal device from notifying the center side due to an erroneous incoming call.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the line terminal device according to the present invention will be described below with reference to the drawings. This embodiment is an example applied to the case of monitoring the gas consumption described above, and FIG. 1 is a block diagram of a line terminal device of this embodiment.

In this embodiment, a bidirectional adapter is provided in a device for reporting the gas consumption amount from the line terminal device to the center side at a constant cycle, and the gas consumption amount is issued in response to a request for reporting the consumption amount from the center side. The amount of information can be reported from the line terminal device side to the center side.

In FIG. 1, reference numeral 10 is a reporting unit for reporting the gas consumption to the center side, and 20 is a bidirectional adapter. L1 and L2 are connection terminals for connection with a telephone line, and the bidirectional adapter 20 has connection terminals L1 and L2.
And the notification device unit 10. The TEL is a telephone as a response unit that responds to an incoming call from the telephone line, and is connected to the notification device unit 10. As the response means, a facsimile device may be connected instead of the telephone TEL.

FIG. 2 is a block diagram showing a configuration example of the bidirectional adapter 20 of this example. That is, Li1 and Li2 are terminals connected to the line connection terminals L1 and L2, and Lo1 and Lo2.
Is a terminal connected to the notification device unit 10, and Do1 and Do2 are output terminals of an output signal RQ indicating a notification request from the center side.

Reference numeral 21 denotes a busy detector for displaying the line busy on the display DSP. Reference numeral 22 is a bandpass filter for extracting the NCNG signal or calling terminal identification signal sent through the telephone line, 23 is a detection circuit for detecting the NCNG signal, and 24 is a control unit for controlling the whole. , The detection output signal of the detection circuit 23 is the control unit 2
4 is supplied. In the case of this example, the control unit 24 is equipped with a microcomputer and performs a control operation as described later by a program stored in the ROM 25.

Reference numeral 26 is a hybrid circuit, 27 is a facsimile modem, and the control section 24 can carry out facsimile communication via the modem 27.

Reference numeral 28 is a memory for storing a calling terminal identification signal for identifying the center side. The calling terminal identification signal is registered in the memory 28 by making a call with the center when the line terminal device of this example is installed and obtaining the calling terminal identification signal on the center side by data communication via the modem 27. This is done in advance.

HK is a relay, the detection circuit 23 is NC
When the NG signal is detected and the response means such as the telephone TEL does not respond, it is operated by the control unit 24, its contact hk is switched to the state opposite to the illustrated state, and the terminals Lo1 and Lo2 are hybrid circuits. It is connected to the 26 side. P
W is a power supply circuit, which is used as a power supply for the adapter 20 when the contact hk is in the illustrated state. When the relay HK operates and the contact hk is in a state opposite to that shown in the figure,
A line power supply is used as a power supply for the adapter 20. RS is a reset switch of the power supply circuit.

Reference numeral 29 is a photocoupler, which is a control unit 24.
The output signal RQ indicating the notification request from the center side is output from the output terminal D via the photo coupler 29.
It is supplied to o1 and Do2.

Next, in the reporting device section 10 of FIG.
1 is a polarity reversal detection circuit, 12 is a transmission part, 13 is an automatic dial part by MF signal, 14 is an automatic dial part by pulse, 15 is a meter for detecting gas consumption, 16 is a fixed period from the line terminal device to the center side A timer 17 measures the fixed period when the gas consumption amount is notified to the control unit 17, and a control unit 17.

In the case of this example, the control unit 17 is equipped with a microcomputer and performs control operation according to a program stored in a ROM (not shown). The control unit 17
Further, the relay CML having the contact point cml, the relay A having the contact point a, and the relay DP of the automatic dial unit 14 by the pulse are drive-controlled.

As will be described later, the control unit 17 detects whether or not a call is in progress by monitoring the states of the output lines 11a and 11b of the polarity reversal detection circuit 11. Then, the control unit 17 determines when the timer 16 issues a gas consumption amount notification request to the center side at regular intervals and when the bidirectional adapter 20
When the output signal RQ indicating the notification request from the center side is supplied from the center, the automatic dial unit 13 or 14 is driven, the transmission unit 12 is driven, and the gas consumption generated based on the indicated value of the meter 15 is consumed. Report the amount of information to the center side.

Next, in the line terminal device configured as described above, the receiving operation when a call is received from the center side using the facsimile communication network service will be described below.

As described above, in order to send a notification request from the center side to the line terminal device side by the facsimile communication network service, before dialing the subscriber telephone number of the line terminal device side, "161" or " The selection number "162" is input to make a call.

When such a call is made, the exchange of the facsimile communication network confirms the recognition of the calling side, sends an NCNG signal to the line terminal device, and performs a ringing-free incoming call. The calling terminal identification signal is also transmitted to the called side. The adapter 20 of the line terminal device performs the processing for this incoming call in the processing procedure shown in the flowchart of FIG.

First, the adapter 20 uses the bandpass filter 22 and the detection circuit 23 to receive 1300 when an incoming call is received.
The Hz NCNG signal is detected, and the detection output signal is sent to the control unit 24. The control unit 24 outputs N from this detection output signal.
If it is judged that the incoming call is a CNG signal (step 10)
1), it is determined whether or not there is a response from a response means such as a telephone TEL connected to the terminals Lo1 and Lo2 (step 102). This takes into consideration that when the response means is not the telephone TEL but a facsimile machine, the facsimile machine may be able to respond to this NCNG signal.

The determination in step 102 is made, for example, by waiting for a response from the response means for a predetermined time set in advance. Then, if there is no response from the response means within the predetermined time, the control section 24 drives the relay HK to bring the contact point hk into the state opposite to that shown (step 103).

Then, the control section 24 executes the facsimile sequence using the hybrid circuit 26 and the modem 27 (step 104), and the calling terminal identification signal obtained at the time of this facsimile sequence is stored in the memory 28. The calling terminal identification signal is checked (step 105), and if they match, the control unit 2
4 sends the output signal RQ to the control unit 17 of the reporting device unit 10 through the output terminals Do1 and Do2 (step 106).

Then, after that, the control section 24 sends the confirmation signal (CED) of the called station to the facsimile communication network and then does not send the reception preparation completion signal (CFR) within 30 seconds. Open, and relay H
K is controlled to restore the contact hk to the state shown in the figure (step 107), and the incoming call process is terminated.

When it is determined in step 105 that the received calling terminal identification signal does not match the calling terminal identification signal stored in the memory, an output signal RQ indicating a notification request from the center side is sent. Without outputting to the device unit 10, the process proceeds to step 107, the line is opened, and this incoming call process is ended.

If it is determined in step 102 that the facsimile device as the response means has responded, the process proceeds from step 102 to step 108, and the modem 27 receives the output signal of the bandpass filter 22,
Monitor the fax sequence between the fax machine and the network. Then, in step 109, the modem 2
The control unit 24 obtains the calling terminal identification signal from the output signal from the No. 7 and compares it with the calling terminal identification signal of the memory 28 in the same manner as described above.
Proceeding to step 6, the output signal RQ is sent to the control section 17 of the reporting device section 10 through the output terminals Do1 and Do2, and if they do not match, this reception processing is terminated.

When the notification device section 10 receives the output signal RQ of the adapter 20, it performs an automatic dialing call operation. In this example, the notification device section 10 automatically avoids a collision during a call or an incoming call. The dial call operation is performed.
The operation of the reporting device unit 10 will be described below.

When the output signal RQ indicating the notification request from the center side is supplied from the adapter 20 to the control unit 17,
The control unit 17 outputs the output line 11a of the polarity inversion detection circuit 11,
The state of the potential of 11b is detected.

That is, for example, when the telephone TEL is not in a call, no call current flows through the polarity reversal detection circuit 11, so that the photocouplers PCa and PCb are both off and the output lines 11a and 11b are both high level. It becomes the state of. On the other hand, when the telephone TEL is in a call, the telephone current is supplied from the line side to the telephone TEL via the contact cml of the relay CML and the polarity reversal detection circuit 11, so that the line polarity (usually L1 is high level)
According to the polarity inversion detection circuit 11, the photocoupler PCa
, Terminal L1-contact hk-contact cml-telephone TEL-
The circuit of contact cml-photocoupler PCa-L2 is turned on, and the output line 11a becomes low level.

Therefore, when the potential of either one of the output lines 11a and 11b of the polarity reversal detection circuit 11 is at the low level, the control unit 17 suspends the next operation and does not perform the automatic dialing operation.

On the other hand, the output line 11 of the polarity reversal detection circuit 11
When both a and 11b are at the high level, the control unit 17 shifts to the next operation and operates the relay A. As a result, the contact a is switched to the state opposite to the illustrated state, so that the contact dp of the relay DP as the dial pulse sending means is prepared on the line side, and the polarity reversal detection circuit 11 has a high impedance due to the resistance R. Connected to the line to form a closed loop.

At this time, on the line side, the terminal L1 is normally at the high level as described above, but when a call is received, this is reversed and the terminal L2 side becomes the high level. This is used to prevent a collision with an incoming call. That is, at this time, when the terminal L1 is at the high level, the output line 11a of the polarity reversal detection circuit 11 is at the low level, and when the terminal L2 is at the high level, the output line 11a is at the low level. If the output line 11a is at the low level, the next operation is performed, but if the output line 11b is at the low level, the arrival of the ringing signal by the incoming call is confirmed for a fixed time, for example, 3 seconds. Therefore, the control unit 17
The timer 18 set to "3 seconds" is driven.

Then, the control unit 17 controls the timer 18 to 3
The relay A is once restored until a timed output is received after a lapse of seconds, and an AC loop in which a capacitor C is inserted in the closed loop is formed. The telephone T
When EL is always connected, an AC loop passing through the telephone circuit is formed, and in that case the capacitor C may be omitted. When a call signal arrives at the AC loop, the photocouplers PCa and PCb are alternately turned on / off. Therefore, when the control unit 17 detects a potential change of the output lines 11a and 11b by the photocouplers PCa and PCb, it prohibits the automatic dial call operation described later to prevent a collision with an incoming call.

On the other hand, if no change in the potential of the output lines 11a and 11b is detected, it is determined that the above polarity (the terminal L2 is at the high level) is not due to an incoming call, for example, due to a mistake in connection work. As the next operation, the state of the potentials of the output lines 11a and 11b at that time is stored in the memory 19, and the relay CML is driven to contact the contact cml.
Is switched to a state opposite to that shown.

Then, the automatic dial unit 14 is driven.
The automatic dial unit 14 sequentially reads dial numbers set in advance for automatic dialing, and intermittently operates the relay DP according to the numbers. Then, a dial pulse is transmitted by the contact point dp, and an automatic dial call operation is performed. The telephone line is PB
In the case of the line (by the MF signal), the control unit 17 is set so as to operate the automatic dial unit 13.

When the transmission of the number by the automatic dialing operation is completed as described above, the control unit 17 causes the relay A
And the transmission section 12 is connected to the line side, and the response of the other party is monitored by comparing the state of the potentials of the output lines 11a and 11b of the polarity reversal detection circuit 11 with the state stored in the memory 19. .

When the other party's response is detected by the polarity reversal from the state stored in the memory 19, the gas consumption amount information is generated based on the indication value of the meter 15, and the transmission unit 1
Report to the center side via 2.

In this way, the line terminal device receives an incoming call from the center side without ringing through the facsimile communication network and automatically dials in response to the incoming call. Can be called at any time without ringing the bell to cause automatic dialing. In consideration of the fact that the facsimile communication network service is cheaper than the no-ringing service and can be used over a relatively wide area, the practical effect of the present invention is great.

The reporting device unit 10 not only makes an automatic dial call by the output signal RQ from the adapter 20, but also makes the above-mentioned automatic dial call at a constant time interval set in the timer 16.

In the above example, two-way communication is possible only by attaching the adapter 20 to the reporting device section 10 which automatically dials the center side to report information such as gas consumption at a fixed cycle. Therefore, if the reporting device unit 10 is already installed, the adapter 20
The installation work is simple and the user's financial burden is small.

However, the line terminal device according to the present invention is
Of course, it is also possible to adopt a configuration other than the adapter type. FIG. 4 is a block diagram of an embodiment of the line terminal device according to the present invention in that case. In the example of FIG. 4, the same parts as those of the example of FIG. 1 described above are denoted by the same reference numerals.

That is, in this example, the terminal L1 is connected to the contact cml of the relay CML without passing through the adapter 20, and the terminal L2 is connected to the polarity inversion detecting circuit 11 without passing through the adapter 20. And the terminal L
The connection point between 1 and the contact cml and the connection point between the polarity reversal detection circuit 11 and the contact cml are passed through a transformer T to a bandpass filter 31 having the same configuration as the bandpass filter 22 in the example of FIG. Connected, this bandpass filter 3
1300Hz NCNG signal detection circuit 3 on the output side
2 and the output signal of the detection circuit 32 is supplied to the control unit 1.
7 is supplied.

Similarly, the output of the bandpass filter 31 is supplied to the control unit 17 for monitoring the facsimile sequence when the response means is a facsimile machine. Further, in the case of this example, the transmission unit 33 has a built-in modem corresponding to the modem 27, through which the facsimile sequence is executed after detecting the NCNG signal. Other configurations are exactly the same as the example of FIG.

Also in the case of this example, similarly to the case of the above-mentioned adapter type, the notification request from the center side is detected from the detection output of the NCNG signal and the collation result of the calling terminal identification signal, and in response thereto. It can be easily understood that the automatic dialing call can be made by using this method.

In the case of this example, the function of the circuit 21 for displaying during a call provided in the adapter 20 is that the polarity inversion detection circuit 1
1 can be achieved, and since only one control unit is required, there is an advantage that the configuration can be simplified.

The above example is an example of a gas consumption reporting device, but the line terminal device according to the present invention is not limited to this, and an automatic dialing call is made in response to an incoming call from a predetermined partner. It can be applied to all line terminal devices that perform.

[0056]

As described above, according to the present invention, when the non-ringing incoming signal of the facsimile communication network is detected, the automatic dialing call is made. It is possible to call the line terminal device from the center side to make automatic dialing without ringing.

Since the facsimile communication network service is cheaper than the no ringing service and can be used over a relatively wide area, the practical effect of the present invention is great.

Further, not only the non-ringing incoming signal of the facsimile communication network but also the calling terminal identification signal, which is the identification information of the calling side, is confirmed to prevent automatic dialing to the wrong destination. You can

[Brief description of drawings]

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

FIG. 2 is a block diagram of an embodiment of a bidirectional adapter that is a main part of the example of FIG.

FIG. 3 is a flow chart of an operation at the time of reception of the bidirectional adapter of the example of FIG.

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

[Explanation of symbols]

 L1, L2 line connection terminal 10 reporting device unit 11 polarity reversal detection circuit 12 transmission unit 13 automatic dial unit (PB line) 14 automatic dial unit (DP line) 15 meter 16 timer 17 control unit 20 bidirectional adapter 23 NCNG signal detection Circuit 24 Control unit 26 Hybrid circuit 27 Modem Do1, D02 output terminal

Claims (2)

[Claims] 1. A line terminal device connected to a telephone line, comprising means for detecting a non-ringing incoming call in a facsimile communication network, and an automatic telephone communication call to the telephone line with a pre-stored telephone number. The dial means, the line opening means for opening the facsimile communication connection in response to the detection output signal of the non-ringing incoming call of the detecting means after a certain period of time of the detection of the non-ringing incoming call, and the operation of the line opening means. A line terminal device comprising: an activation unit that activates the automatic dialing unit after a fixed time period. 2. A line terminal device connected to a telephone line, wherein a detecting means for detecting a non-ringing incoming call of a facsimile communication network, and a calling terminal identification signal sent from the facsimile communication network are registered in advance. Determination means for determining whether or not it matches the calling terminal identification signal, an automatic dialing means for making a telephone communication call to the above-mentioned telephone line with a pre-stored telephone number, and the non-ringing incoming call for the detecting means. In response to the detection output signal from the determination means, the line opening means for opening the facsimile communication connection in response to the judgment output of the judgment means, and the starting means for starting the automatic dial means after a fixed time period of the operation of the line opening means. A line terminal device, comprising: