JPH07107197A - No ringing communication equipment - Google Patents

Abstract

PURPOSE:To conduct a no-ringing communication by an inexpensive equipment without using an expensive no-ringing trunk by providing a means for discriminating a transmitting person. CONSTITUTION:When a call is conducted from a center side by utilizing telephone lines L1, L2 in which a transmitting person information signal is added to a call signal, the signal (ringer) and a transmitting person number sent out in a pause period of the call signal are detected in a controller 10 of a terminal side. Subsequently, when it is discriminated that the detected transmitting person number is a number from the center, a response is conducted and transmission of data is started by a no-ringing communication. On the other hand, when it is descriminated that the detected transmitting person number is not the number from the center, the telephone lines L1, L2 are connected to a telephone set 11, so that a telephone user can utilize it. Also, in the case calling is conducted from the telephone set 11, the telephone set 11 and the telephone lines L1, L2 are connected automatically when the telephone set 11 is subjected to off-hook, and a speech can be conducted.

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 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 or electricity used in each home to a management center. With this telemeter system, "calls from terminals" that are sent from each home and meter readings from the center at any time are performed.
There are two types of activation methods, "center activation".

The activation request from the center side is generally made by using a no ringing trunk. "No ringing" means "does not ring the bell of the home telephone", and the no ringing trunk is realized as an exchange equipment to realize it. That is, as shown in FIG. 5, the no ringing communication device includes a center side device 1 including a host computer and a center side network control device, and a terminal side control device 2 of each home.
And 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", while at the same time sending an NRS signal (DTMF signal) to select one of several home appliances.

[0005]

However, the use of such a no-ringing trunk is very low compared to the usual telephone line usage, so that there is a problem that the charge is very high. There was a problem that even if we applied for the installation of trunk equipment instead of the equipment equipped on the telephone line, we could not immediately respond. Furthermore, since the signal emitted by the no ringing trunk is received, the function of detecting a special gentle polarity inversion and the DTM
The terminal device is required to have the function of receiving the F signal. Also,
Even on the center side, a complicated device is required to control the no-ringing trunk.

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]

In the problem solving means according to the present invention, as shown in FIG. 1, a telephone 11 is connected to a control device 10 of a terminal side device, and the control device 10 is connected to the telephone 11.
Means for disconnecting the telephone lines L1 and L2 from the switch (switch switching section 15), means for detecting the caller number signal and the ringing signal sent from the exchange (reciprocal detection section 12, FSK section 13), and the detected outgoing call Means for identifying whether or not the call is from the center side device based on the person number signal (information determination unit 17), and disconnecting 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, the data communication unit 18), means for detecting the use state of the telephone 11 (off-hook detection unit 19), and the telephone lines L1 and L2 when the telephone 11 is off-hook.
To the telephone line L1, when the telephone 11 is on-hook.
It is provided with means for disconnecting the telephone 11 from the L2 (switch switching unit 15, off-hook detection unit 19).

The signal form for transmitting the caller number signal inserted in the idle period of the ringing signal and the signal form used for data transmission are the same.

[0009]

In the above means for solving the problem, when a call is made from the center side by using the telephone lines L1 and L2 in which the caller information signal is added to the call signal, the call signal ( (Ringer) and the calling number sent during the idle period of the ringing signal. When the detected caller number is identified as the number from the center, in response, the data transmission is started by the no ringing communication. If it is identified that the detected caller number is not the number from the center, the telephone line L1,
The L2 is connected to the telephone 11 and made available to telephone users.

When making a call from the telephone set 11,
When the telephone set 11 is off-hook, the telephone set 11 and the telephone lines L1 and L2 are automatically connected, and the telephone call becomes possible.

[0011]

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

The control device 10 includes a telephone 11 in the house.
Is connected, and the polar reversal detection unit 1 that performs polarity reversal detection
2, an FSK unit 13 for detecting a caller's number signal sent from the exchange, a dial unit 14 for dialing when a call is made from the terminal side, and a telephone line L for the telephone 11.
Switch switching unit 15 for connecting and disconnecting to and from L1 and L2, a code setting unit 16 configured by a semiconductor memory or a DIP switch for setting a caller number of a specific partner, and a detected caller number An information judging section 17 for comparing the signal with a set caller number to identify whether or not the person is a specific party, a data communication section 18 for transmitting meter reading data of a gas meter or a water meter, and a telephone 11
And an off-hook detecting section 19 for detecting the usage state of the. The control device 10 includes a CPU, ROM, RAM, and a clock unit 2 as a clock for performing various controls.
It also has 0.

The control device 10 has a function of transmitting data 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 is from the center side device, and the telephone 11 is off-hook. The telephone line L1, L2 is connected to the telephone line 11 when the call is made, and the telephone line 11 is disconnected from the telephone line L1, L2 when the telephone set 11 is on-hook.

Further, the off-hook detecting section 19 detects the use state of the telephone by setting the telephone 11 to the telephone line L1.
In a state in which the telephone 11 is disconnected from L2 and connected to the off-hook detector 19, a voltage is applied to the telephone 11 from a power source to monitor the impedance of the telephone 11. Then, when the impedance is below a certain value, it is determined to be off-hook, and when the impedance is above a certain value, it is determined to be on-hook.

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

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

On the other hand, in the exchange, after the time T11, the ringer signal A, which is a ringing signal composed of an AC signal of 75 V at a frequency of 16 Hz, is transmitted for 1 second (period t11 in FIG. 2), and thereafter. During the 2-second rest period (the period t12 in FIG. 2), the CCI
TT (International Telegraph and Telephone Consultative Committee) V. The caller number signal B is transmitted by FSK, which is the signal form recommended by No. 23 Recommendation. The exchange repeats this operation until it receives a response.

In the control device 10, the FSK unit 13 to which the operation start instruction is given extracts the caller number signal after the time T11 and sends it to the information judging unit 17. Therefore, it is compared with the value set in the code setting section 16, and when they match, the FSK section 13 and the data communication section 18 have the same signal form as the caller number signal CCITTV.
23 Commence data communication with FSK recommended.

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

In the standby state waiting for a call from the center side, since the switch switching section 15 connects the telephone 11 to the off-hook detecting section side, even if the telephone user tries to use it, it cannot be used as it is. Therefore, FIG.
As described above, the off-hook detection unit 19 monitors the off-hook of the telephone 11, and if the telephone user at home goes off-hook to use the telephone 11, the change in impedance due to this is detected and the switch switching unit 15 is detected. Then, the telephone lines L1 and L2 are connected to the telephone 11 and the telephone 11 is switched to be usable.

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 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, since the terminal side equipment does not need the function of detecting a gentle polarity reversal and the DTMF receiving function, it can be constructed at a low cost, and the center side does not need a complicated device for controlling the no ringing trunk. Therefore, 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 ringing signal and the signal used for data transmission are the same, the transmitting / receiving device can be constructed 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, so that the communication interference can be prevented.

The present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

Since the caller's number signal is inserted and sent from the exchange during the rest period of the calling signal, it is possible to determine whether the caller's number signal is inserted in the rest period, which is a predetermined position, by a specific partner. You may identify whether it exists. At this time, if the caller's number signal is not inserted in the predetermined position, it is determined that the person is not a specific party, and the telephone line is switched to connect to the telephone.

Further, as the signal form used for the sender number signal or data transmission, PSK or PB signal may be used instead of FSK.

As a prior art of the present invention, Japanese Patent Laid-Open No. 1-
When the caller identification code is transferred to the digital telephone in 170253, there is a problem that the conventional analog switch cannot deal with the method of transferring the caller identification code. Therefore, the caller identification code is transferred using the analog switch. A possible technique is 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 who should respond, so that the ringer rings and no ringing communication is performed. However, there is a problem in that the ringing communication is not possible, which is completely different from the purpose of the present invention for performing no ringing communication without using the no ringing trunk.

[0029]

As is apparent from the above, according to the present invention, the means for identifying the caller is provided. Therefore, by switching the telephone line to the telephone in accordance with the caller, the no ringing trunk is transmitted from the center side. The control device on the terminal side can be started up without using, and data can be transmitted. 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 gentle polarity reversal and the DTMF receiving function, and the center side does not need a complicated device for controlling the no-ringing trunk, so that the device for transmission and reception is not required. Can be configured at low cost.

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, so that the communication interference due to this can be prevented. Moreover, the system is always ready to receive calls from the center side, so that you will not accidentally ring the telephone when you call from the center side, and you will not have to perform any special operations when using the telephone. All you have to do is 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 drawings]

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

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

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

FIG. 4 is a flowchart showing an operation on the side of a terminal in standby.

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

[Explanation of symbols]

 10 control device 11 telephone 12 anti-reverse 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 (3)

[Claims] 1. In a communication device for performing data transmission by no ringing communication between a terminal side device and a center side device using a telephone line, a telephone is connected to the control device of the terminal side device, and the control device is , Means for disconnecting the telephone line from the telephone, means for detecting a caller number signal and a calling signal sent from the exchange, and whether or not the call is made from the center side device by the detected caller number signal. A no-ringing communication device comprising: a means for identifying and a means for performing no-ringing communication in a state where the telephone is disconnected from a telephone line when a call is made from the center side device. 2. The no-ringing communication device according to claim 1, wherein the signal form for transmitting the caller number signal and the signal form used for data transmission are the same. 3. A control device for a terminal-side device, means for detecting a usage state of a telephone, and 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. 2. The no-ringing communication device according to claim 1, further comprising: