JPS585074A - Alarm transmission system - Google Patents

Abstract

PURPOSE:To prevent hindrance to calling by using an out-band signal as an alarm signal for an alarm transmission system wherein a terminal, a trunk, connection device, and a center device are connected through a telephone line, and providing a function which detects a break of the signal to a telephone side. CONSTITUTION:When an alarm is generated by an alarm sensor 1, the signal loop of the alarm signal supply circuit 13 of a terminal device 3 is opened to cut off an out-band signal generated invariably by an alarm signal originating circuit 14. A filter 15 separates a voice signal and the out-band signal in such a way that the voice signal passes through a telephone set and the out-band signal passes through a telephone line 5. A trunk connection device 6 connected to the telephone line 5, when detecting a break of the out-band signal, detects a subscriber's address to send an automatic dialing signal to a switchboard 7, and thus calls a center device 11; when the center device 11 answers to it, the trunk connections device 6 detects that and transfers necessary alarm information to the center device 11. Once the center device 11 returns confirmation information, calling is reset.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an alarm transmission method KIIL that transmits alarm signals for crime prevention, disaster prevention, etc. using telephone lines. The present invention relates to an alarm transmission method for transmitting an alarm without any alarm transmission.

Traditionally, this type of alarm transmission system has mainly used leased lines, and there is no example in which a general subscriber telephone line can be used for both voice calls and alarm transmission without interfering with normal communications. . In cases such as crime prevention alarms, telephone calls are disconnected when an accident occurs, so it cannot be said that the conventional alarm transmission method is an effective measure against this problem. Although the general subscriber telephone line can be used as is for alarm transmission, there is no need to install a new transmission line, which is a great advantage in fields such as alarm transmission systems.

SUMMARY OF THE INVENTION In order to solve these problems, it is an object of the present invention to provide a wide-area alarm transmission system that can use general subscriber telephone lines as is.

The present invention is provided with an alarm sensor that cuts off a signal loop when an alarm occurs at a position where alarm information is generated, a terminal device k, means for supplying an alarm signal to the alarm sensor, and means for supplying the alarm signal to a subscriber telephone line. and a P-wave device that provides the telephone with voice signals for telephone calls on the subscriber telephone line,
The relay device includes a one-wave circuit that sends the alarm signal to the telephone communication network and a voice signal for communication from the telephone communication network to the terminal device, and a signal detection circuit that detects the alarm signal of the -wave circuit. , and an automatic calling circuit that is activated by the output of this signal detection circuit and automatically calls the center device,
The present invention is characterized in that the center device includes a network control circuit that receives a paging signal transmitted from the automatic paging circuit, and a data processing circuit that processes the paging signal received by the network control circuit.

Next, an embodiment of the present invention will be described in detail with reference to the drawings. The first diagram is a block diagram of an alarm transmission device according to an embodiment of the present invention. In FIG. 1, an alarm sensor 1 is connected to a terminal device 3Km via an alarm line 2. A telephone 4 is connected to this terminal device 3. The terminal device 3 is connected to the relay device 6 via the terminal-side subscriber telephone line S. These six relay devices are connected to an exchange 7 on the terminal side. The exchange 7 is connected to an exchange 9 on the center side via an interoffice relay line 8. A center device 11 is connected to this exchange 9 via a center-side subscriber telephone line 10.

ζ Here, the alarm sensor 1 is a device for cutting off a signal loop, for example, a DC signal loop, which is constantly supplied from the terminal device 3 when an alarm occurs.
Even if the alarm wire 2 connecting the alarm sensor 1 and the alarm wire 1 were to be cut, the conditions 1 would be the same as when an alarm occurs.

Figure 2 is a detailed circuit configuration diagram of this terminal device 1. t
In the diagram Jlc2, a signal supply circuit 13 for supplying an alarm sensor IK alarm signal is connected to the alarm lllI2. This signal supply circuit 13 is connected to an alarm signal generation circuit 14 that generates an alarm signal. A P-wave device 15 is connected to this alarm signal transmitting circuit 14 . This P-wave device 15 separates and couples the telephone call voice signal from the subscriber telephone line 50 to the telephone set 4 and the alarm signal (out-of-band signal) to the subscriber telephone line 5. That is, the telephone set 4 is connected to the voice signal side of the F wave device 15, the public alarm signal transmission circuit 14 is connected to the out-of-band signal side, and the subscriber telephone line 5 is connected to the other side.

When this terminal device 3 detects a loop break in the alarm sensor 1, it stops the alarm signal that is constantly being sent to the subscriber telephone line 5 via the P-wave device 15. This is K, the terminal-side subscriber phone Im that connects the terminal device 3 and the relay device 6! Even in the unlikely event that 5 is disconnected, the same conditions as when an alarm occurs will occur.

FIG. 5 is a detailed circuit diagram of this relay device 6. In FIG. 5, 16 is a one-wave circuit, and each subscriber telephone line 5
inserted into. A signal detection circuit 17 is connected to the output of each one-wave circuit 16. Each signal detection circuit 17 is
The center device 11 is connected via a control circuit 18 to an automatic calling circuit 20 that automatically issues Kff. A modulation/demodulation circuit 21 is connected to the control circuit 18 for transmitting information such as the address of the terminal where an alarm occurs and the content of the alarm after the center device 11 responds.

The Pa circuit 16 is inserted into the switchboard 7 on the subscriber side in the same way as the terminal device 30F transmitter 15, and separates the telephone voice signal of the subscriber telephone line 5 from the alarm signal (out-of-band signal). The voice signal side is connected to the exchange 7, and the out-of-band signal side is connected to a built-in interface circuit. Also, the automatic calling circuit 2o is directly connected to the subscriber telephone line side of the exchange 7. Then, the subscriber telephone number to which the center device 11 to be transferred is connected is automatically dialed.

FIG. 4 is a circuit configuration diagram of the printer device 11.

In FIG. 4, the center device 11 includes the relay device 6.
A control circuit 22 that automatically responds to a call signal that arrives from the selected exchange 9 via the center-side subscriber telephone 10 via the inter-office trunk line 8 when an automatic call is received from the center; A modulation/demodulation circuit 24 capable of data transmission with the device 6, and the network control section (network control circuit 2)
2 and the modulation/demodulation circuit 24), and display, etc. The data processing circuit 25 is provided with a data processing circuit 25 that performs processing.

The operation sequence of the entire alarm transmission device with such a configuration will be explained with reference to FIG. When an alarm occurs in the alarm sensor 1, the terminal device 3 detects a break in the DC loop it supplies, and sends an alarm signal (which is always sent to the telephone line regardless of whether the subscriber telephone is in use or not).
out-of-band signals). The relay device 6 detects disconnection of the output from the F-wave circuit 16 for each subscriber telephone line, identifies the subscriber address, and transmits the address to the center device 1.
1, the subscriber telephone number of the center device 11 is automatically dialed to the exchange 7. A calling signal (1
6Hg), the center device 11 detects the signal and responds by closing the loop, thereby establishing a @118 connection and sending a connection response signal (polarity inversion) to the relay device 6. The relay device 6 transfers necessary alarm information to the center device 11, cancels the call based on confirmation information from the center device 11, and the entire sequence ends.

The terminal where the alarm has occurred then takes some kind of artificial or automatic action, and the loop break state of the alarm sensor I is released.

As described above, the alarm transmission method according to the present invention is characterized by using an out-of-band signal that does not affect the telephone voice signal as an alarm signal, and by inserting an out-of-band signal disconnection detection function on the subscriber telephone side of the exchange. Therefore, it is possible to realize a transmission system that allows both telephone calls and alarm signals to be sent over a general subscriber telephone line, and that can also cope with the disconnection of the transmission path that tends to occur when a crime prevention alarm occurs.

In the above description, an example is shown in which the transmission line connecting the relay device 6 and the center device 11 is connected by a switched line via exchanges 7 and 9. The same effect can be achieved even if they are directly connected.

Furthermore, although an example is shown in which a single alarm sensor 1 is connected to the terminal device 3, the terminal device 3 may accommodate a plurality of alarm sensors, and in that case, the alarm signal (out-of-band signal) is The logical sum may be performed using a single frequency signal, or a plurality of (IP1 to IPn) frequency-divided signals outside the round band may be used. Furthermore, a combination of a plurality of signals may be used.

As described above, according to the present invention, it is possible to create a wide-area alarm transmission system using general subscriber telephone lines, and furthermore, it is possible to share calls and alarm transmission, and there is no need to take measures against disconnection of the transmission line. It has excellent effects.

[Brief explanation of drawings]

The first WA is a configuration diagram of the second embodiment arm transmission device of the present invention. FIG. 2 is a circuit configuration diagram of the terminal device as well. FIG. 5 is a circuit configuration diagram of a relay device similar to the fifth WAa. FIG. 4 is a circuit diagram of the center device. Figure 5 is a diagram showing the operation sequence of the above embodiment. 1... Alarm sensor, 2... Alarm line, 3-...
- Terminal device, 4... Telephone, 5... Terminal side subscriber telephone line, 6... - Relay device, F... Switch, 8... Inter-office trunk line, 9... Exchange, 10- ...Center side subscriber telephone line, ll...Center device, 13...Signal supply circuit,
14--Alarm signal transmission circuit, 15--F wave device, 1
6...P wave circuit, 17-...signal detection circuit, 18...
-Control circuit, 2G--Automatic calling circuit, 21--Modulation/demodulation circuit, 22--Network control circuit, 24--Modulation/demodulation circuit, 2
5--Data processing circuit. Patent Applicant NEC Corporation Representative Patent Attorney Nao Takashi Ide Figure 1 3 Figure 3 1

Claims (1)

[Claims] (1) An alarm sensor that cuts off the signal loop when an alarm occurs is installed at the location where alarm information is generated, and the terminal equipment
1K, comprising means for supplying an alarm signal to the alarm sensor, and a P-wave device for supplying the alarm signal to the subscriber telephone and a voice signal for communication on the subscriber telephone line to the telephone; an F-wave circuit that sends out the telephone communication network to the telephone communication network and a voice signal for communication from the telephone communication network to the terminal device, a signal detection circuit that detects the alarm signal of this P-wave circuit, and an output of this signal detection circuit. an automatic paging circuit that starts up and automatically calls the center device; a network control circuit that receives a paging signal transmitted from the automatic paging circuit; An alarm transmission method equipped with a data processing circuit for processing.