JP2000165549A - No-ringing communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform the no-ringing communication with no use of no-ringing trunk by identifying whether the calling is given from a center device based on the detected caller number signal and performing the no-ringing communication with a telephone set separated from a telephone circuit when the calling is given from the center device. SOLUTION: When the calling is given from the center side by means of the telephone circuits L1 and L2 where the caller information signals are added to the call signals, a controller 10 of the terminal side detects a call signal (linger) and a caller number that is transmitted in a pause period of the call signal. If it is identified that the detected caller number is given from the center side, the transmission of data is started in reply by the no-ringing communication. If the detected caller number is not given from the center side, both circuits L1 and L2 re connected to a telephone set 11 and the telephone users can use these circuits L1 and L2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a no-ringing communication device for transmitting data by a no-ringing communication using a telephone line.

[0002]

2. Description of the Related Art A system for transmitting data using a telephone line includes a telemeter system for transmitting the amount of gas and electricity used in each home to a management center. In this telemeter system, a "terminal call" originating from each home and a meter reading from the center as needed.
There are two types of activation methods, "center activation".

[0003] The start request from the center is generally made by using a no-ringing trunk. "No ringing" means "the ring of the home telephone is not ringed", and the no ringing trunk is realized as an exchange equipment for realizing it. That is, as shown in FIG. 5, the no-ringing communication device is composed of a center device 1 having a host computer and a center network control device, and a terminal control device 2 of each home.
Are connected by a telephone line 5 via the center-side and terminal-side exchanges 3 and 4. A no-ringing trunk 6 is installed in the terminal-side exchange 4.
In the figure, 7 is a gas or water meter, and 8 is a telephone.

Next, the operation of the no-ringing trunk will be described. The no-ringing trunk performs a gradual polarity reversal to prevent the home telephone from ringing, and at the same time sends out an NRS signal (DTMF signal) to select one of several home appliances.

[0005]

However, the use of such a no-ringing trunk has a problem in that the usage is very small compared with the ordinary telephone line usage, so that the fee is very high. There was a problem that even if an application for installation of trunk equipment was made instead of equipment provided for the telephone line, it was not possible to respond immediately. In addition, a function to detect special gentle polarity reversal and DTM to receive the signal generated by the no-ringing trunk
The function of receiving the F signal is required of the terminal device. Also,
On the center side, a complicated device for controlling the no-ringing trunk is required.

In view of the above, an object of the present invention is to provide a no-ringing communication device capable of performing no-ringing communication without using a no-ringing trunk.

[0007]

According to the present invention, as shown in FIG. 1, a telephone 11 is connected to a control device 10 of a terminal device, and the control device 10
Means for disconnecting the telephone lines L1 and L2 from the switch (switch switching section 15), means for detecting a caller ID signal and a call signal sent from the exchange (reciprocal detection section 12, FSK section 13), Means (information determining unit 17) for identifying whether or not the call is from the center-side device based on the user number signal, and disconnects the telephone 11 from the telephone lines L1 and L2 when the call is from the center-side device. Means for performing no ringing communication in the state (FSK unit 1)
3, data communication unit 18), means for detecting the use state of telephone 11 (off-hook detection unit 19), and telephone lines L1 and L2 when telephone 11 is off-hook.
To the telephone line L1 when the telephone 11 is on-hook.
Means for disconnecting the telephone set 11 from L2 (switch switching section 15, off-hook detection section 19).

[0008] The signal form for transmitting the caller ID signal inserted during the idle period of the call signal is the same as the signal form used for data transmission.

In the above means for solving the above problems, when a call is made from the center side using the telephone lines L1 and L2 in which the caller information signal is added to the call signal, the control signal on the terminal side is sent to the control device 10 on the terminal side. Ringer) and the caller ID sent during the pause of the call signal. If the detected caller number is identified as a number from the center, data transmission is started in response to no ringing communication. Further, when it is determined that the detected caller number is not the number from the center, the telephone line L
1 and L2 are connected to the telephone 11 so that the telephone user can use it.

When a call is made from the telephone 11,
When the telephone 11 goes off-hook, the telephone 11 is automatically connected to the telephone lines L1 and L2, and a telephone call becomes possible.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A no-ringing communication apparatus according to the present embodiment performs data transmission by a no-ringing communication between a terminal device and a center device using a telephone line, as shown in FIG. Both lines L1 and L2 of a telephone line connected to an exchange (not shown) are connected to a control device 10 on the terminal side installed in each home, and the control device 10 is connected to a center device via the exchange. .

The control device 10 includes a telephone 11 at home.
Is connected, and a polarity reversal detection unit 1 that performs polarity reversal detection
2, an FSK unit 13 for detecting a caller ID signal sent from the exchange, a dial unit 14 for dialing when calling from the terminal side, and a telephone line L
1, a switch switching unit 15 for connecting / disconnecting to / from L2, a code setting unit 16 composed of a semiconductor memory or a dip switch for setting a caller number of a specific partner, a detected caller number An information determining unit 17 for comparing a signal with a set caller number to determine whether or not the caller is a specific party; a data communication unit 18 for transmitting meter reading data of a gas meter or a water meter;
And an off-hook detecting section 19 for detecting the use state of the device. The control device 10 includes a CPU, a ROM, a RAM, and a clock unit 2 as a clock for performing various controls.
0 is also provided.

The control device 10 has a function of performing data transmission by no-ringing communication in a state where the telephone 11 is disconnected from the telephone lines L1 and L2 when it is determined that the call originates from the center-side device. The telephone lines L1 and L2 are connected to the telephone 11 when the telephone line is turned on, and the telephone 11 is disconnected from the telephone lines L1 and L2 when the telephone 11 is on-hook.

The use state of the telephone set is detected by the off-hook detection unit 19 by setting the telephone set 11 to the telephone line L1,
While disconnected from L2 and connected to the off-hook detection unit 19, a voltage is applied to the telephone 11 from a power supply, and the impedance of the telephone 11 is monitored. Then, it is determined that the hook is off-hook when the impedance becomes equal to or less than a predetermined value, and it is determined that the hook is on-hook when the impedance is higher than the predetermined value.

[0015] In the above configuration, in a standby state in which the terminal device waits for a call from the center, the telephone 11
The switch switching unit 15 connects the telephone set 11 to the off-hook detection unit side in order to detect the use state of the telephone set, and the telephone set 11 is always disconnected from the telephone lines L1 and L2.

When the center is started from the center, a call signal as shown in FIG. 2 is sent from the exchange to the control device 10. Then, as shown in FIG. 3, at time T11 when a call occurs, the polarities of the telephone lines L1 and L2 are reversed. The polarity reversal is detected by the polarity reversal detection unit 12, and the polarity reversal detection unit 12 sends an output indicating the polarity reversal to the FSK unit 13 as a signal for instructing the start of the operation.

On the other hand, in the exchange, after time T11, a ringer signal A, which is a call signal composed of a 75 V AC signal at a frequency of 16 Hz, is transmitted for one second (period t11 in FIG. 2), and thereafter, During a two second rest period (period t12 in FIG. 2)
TT (International Telegraph and Telephone Advisory Committee) The caller number signal B is transmitted in FSK, which is the signal form of the Recommendation 23. The exchange repeats this operation until a response is received.

In the control device 10, the FSK unit 13 to which the instruction to start the operation is given extracts the caller number signal after time T11 and sends it to the information judgment unit 17. Then, the value is compared with the value set in the code setting unit 16, and when they match, the FSK unit 13 and the data communication unit 18 use CCITTV.
Data communication is started by the FSK of the 23 recommendations.

If they do not match, the switch unit 15 switches the telephone set 11 to the telephone lines L1 and L2. As a result, a calling signal is supplied to the telephone set 11 with a delay of the time (t11 + t12) required for the determination from the time T11, and the ringer of the telephone set 11 rings.

In the standby state waiting for a call from the center, the switch switching unit 15 connects the telephone set 11 to the off-hook detection unit side, so that the telephone user cannot use it as it is. Therefore, FIG.
The off-hook detecting unit 19 monitors the off-hook of the telephone 11 as described above. If the telephone user in the home goes off-hook in order to use the telephone 11, the off-hook detecting unit 19 detects a change in impedance due to the off-hook, and the switch switching unit 15 To connect the telephone lines L1 and L2 to the telephone set 11 and switch to use the telephone set 11.

As described above, by identifying the caller and switching the telephone line to the telephone according to the caller, the control device on the terminal side can be started from the center side without using the no ringing trunk, and the data transmission can be performed. It can be performed. Therefore, no-ringing communication can be performed with an inexpensive device without using an expensive no-ringing trunk.

Also, the terminal device does not need a function of detecting a gradual polarity reversal and a DTMF receiving function, so that it can be configured at a low cost, and the center does not require a complicated device for controlling the no-ringing trunk. Thus, it becomes possible to widely spread the no-ringing communication system at a low price.

Further, since the signal for transmitting the caller number transmitted during the idle period of the call signal is the same as the signal used for data transmission, the transmission / reception device can be configured at low cost.

Further, even if a device harmful to the no-ringing communication (for example, a facsimile) is connected to the control device, the telephone line is disconnected from the telephone or the facsimile during the no-ringing communication.

It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that many modifications and changes can be made to the above-described embodiment within the scope of the present invention.

Since the caller ID signal is inserted from the exchange during the idle period of the call signal and transmitted, it is determined whether the caller ID signal is inserted in the idle period at a predetermined position. You may be made to identify whether there is. At this time, if the caller number signal is not inserted at a predetermined position, it is determined that the caller is not a specific party, and the telephone line is switched to be connected to the telephone.

Further, as a signal form used for a caller number signal and data transmission, a PSK or PB signal may be used instead of FSK.

The prior art of the present invention is disclosed in
JP-A-170253 has a problem that when a caller ID code is transferred from a digital exchange to a digital telephone, the conventional analog switch cannot cope with the problem. Therefore, the caller ID code is transferred using an analog switch. Possible techniques are disclosed. However, in this technology, when a signal requesting data transmission is sent from the center side, the telephone side recognizes that it is the caller to respond to, so the ringer rings and it is possible to perform no ringing communication. This is completely different from the purpose of the present invention, in which no ringing communication is performed without using the no ringing trunk.

[0029]

As is clear from the above, according to the present invention, since the means for identifying the caller is provided, the telephone line is switched to the telephone according to the caller, so that the centering side can be used as a no-ringing trunk. It is possible to start the control device on the terminal side without using the terminal and perform data transmission. Therefore, no-ringing communication can be performed with an inexpensive device without using an expensive no-ringing trunk.

That is, the terminal-side device does not need the function of detecting a gradual polarity inversion and the DTMF reception function, and the center does not need a complicated device for controlling the no-ringing trunk. Can be constructed at low cost.

Further, even if a device harmful to no-ringing communication (for example, a facsimile) is connected to the control device, the telephone line is disconnected from the telephone or the facsimile during the no-ringing communication, so that communication interruption can be prevented. In addition, the system is always ready to receive calls from the center, so that the telephone does not ring accidentally in response to a call from the center, and even when using the telephone, no special operation is performed. You just need to go off-hook, and it won't hurt usability. As described above, it becomes possible to widely spread the no-ringing communication system at a low price.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing signals from an exchange.

FIG. 3 is a flowchart showing an operation on the terminal side when a call is made from the center side.

FIG. 4 is a flowchart illustrating an operation on a terminal in a standby state.

FIG. 5 is a configuration diagram of a conventional no-ringing communication device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 control device 11 telephone 12 reciprocity detection unit 13 FSK unit 14 dial unit 15 switch switching unit 16 code setting unit 17 information determination unit 18 data communication unit 19 off-hook detection unit L1, L2 telephone line

Claims (2)

[Claims] 1. A communication device for performing data transmission by ringing communication between a terminal device and a center device using a telephone line, wherein a telephone is connected to a control device of the terminal device. Means for disconnecting the telephone line from the telephone, means for detecting a caller ID signal and a call signal sent from the exchange, and whether or not the call is from the center-side device based on the detected caller ID signal. A no-ringing communication device comprising: means for identifying; and means for performing no-ringing communication in a state where the telephone is disconnected from a telephone line when the call originates from the center device. 2. A control device for a terminal-side device, comprising: means for detecting a use state of a telephone; means for connecting a telephone line to the telephone when the telephone is off-hook; and disconnecting the telephone from the telephone line when the telephone is on-hook. The no-ringing communication device according to claim 2, further comprising: