JPS58213554A - Device for informing disconnection of line - Google Patents

Abstract

PURPOSE:To inspect telephone lines collectively in a prescribed place and to inform the disconnection of a line to a monitor station, by discriminating the disconnection in a specific area and informing the disconnection together with the telephone number. CONSTITUTION:Trigger pulses are sent from a pulse generating circuit 41 to an address selecting circuit 42. The circuit 42 stores addresses corresponding to subscriber's telephone numbers. A relay driving circuit 43 drives a relay Ai corresponding to the selected address. A discriminating means 5 sends a low frequency signal to the telephone line. Only when a retrieval signal is received from a delay circuit 44, a discrimination circuit 53 is started. When unbalanced voltage is normal as compared to reference voltage, the discrimination circuit 53 advances the disconnection detection to the succeeding line, and only when disconnection is detected, sends a starting signal and a pulse stopping signal. The stopping signal informs the disconnection to a disconnection alarming center and then makes the pulse generating circuit 41 generate pulses again. Simultaneously, the starting signal is send to start a failure information device 7. A data generating circuit 72 starts a centeral telephone number storing circuit 73 to make an automatic dialing circuit 75 dial to the alarm center 2 automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a line disconnection notification device that detects disconnection of a telephone line and notifies a monitoring station.

Conventionally, devices that have been proposed as devices for detecting disconnections in telephone lines and reporting them to monitoring stations are devices that are installed on individual telephones equipped with abnormality notification devices in security systems that use telephone lines. The system is designed to detect and report only line disconnections, and therefore telephones that are not equipped with the abnormality notification device cannot detect line disconnections.

The present invention has been made in order to solve the above-mentioned problems, and its purpose is to install a line disconnection notification device that immediately reports a line disconnection to a monitoring station, that is, a security headquarters, when a line disconnection is detected. It is installed at a specific location, and centrally inspects the individual telephone lines of multiple subscribers within a specific area at the predetermined location, and when a disconnection is detected, it reports the disconnection abnormality to a specific monitoring station or detects a disconnection. The purpose is to display it at a predetermined location.

In order to achieve this object, the present invention provides a contact switching means connected to a subscriber's telephone line, a contact switching control means for controlling the opening and closing of the contact switching means, and a voltage that determines whether the line is disconnected or normal. a storage means for storing a subscriber's telephone number and transmitting the subscriber's telephone number in response to a command; and an abnormality reporting means for reporting a disconnection abnormality detected by the determining means to a monitoring station through a communication line. A line breakage notification device comprising: a line breakage notification device, further comprising an abnormality notification and command means capable of sending a start or stop signal to the contact switching control means in response to a command from the monitoring station via the communication line. is provided, and the present invention further provides:
a contact switching means connected to a subscriber's telephone line; a contact switching control means for controlling opening and closing of the contact switching means; a determining means for determining whether the line is disconnected or normal based on voltage; A line disconnection notification device is provided which includes a display means for notifying a disconnection abnormality.

An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, a line disconnection notification device according to the present invention is installed at a predetermined location, for example, near an exchange 1 of a telephone office, and transmits a telephone line through the exchange 1 to a monitoring station, that is, a security headquarters 2, using a line disconnection as a communication line. The line disconnection notification device includes a contact switching means 3 constituted by a switching contact provided on each subscriber's telephone line, and a contact switching means 3 for controlling the contact switching means 3. Contact switching control means 4. Determination means for detecting and determining line breakage by switching the contact switching means 3. Storage means 6 for storing telephone numbers of subscribers and sequentially transmitting them in response to commands, and the exchange. It consists of an abnormality reporting means for reporting line disconnection information to the security headquarters 2 through the station 1.

First, the pulse generation circuit 41 of the contact switching control means 4
A trigger pulse is sent to address selection circuit 42. The address selection circuit 42 encodes and stores the address corresponding to the telephone number of the subscriber, and selects the address by the trigger A' pulse.The selected address signal is sent to the relay drive circuit 43 and the address corresponding to the subscriber's telephone number is coded and stored. The relay drive circuit 43 drives the relay corresponding to the selected address as relay AI.

A, . . . An is selected and driven to close the contact. These operations are instantaneous and the contacts are opened and closed within a short period of time, for example about 50 milliseconds, so as not to affect the telephone call even if the telephone line of the selected address is busy. Here, to describe the operation when the contact of the relay of the selected address is closed, in the determination means 5, the Pritsuno circuit 51 is composed of resistors RA, RB and R6, capacitors CA and CB, and low frequency oscillation means O8C. Ru. When any of the contacts of the contact switching means 3 is closed, a low frequency signal having a frequency f of about 16 Hz, for example, is sent out to the telephone line from the low frequency oscillation means O8C. The capacitor tCB is a capacitor for blocking the direct current component of the line, thereby preventing direct current from flowing into the bridge circuit 51 when the contact is closed. Therefore, the Purino circuit 51 outputs an AC unbalanced voltage, but this frequency also includes noise components such as second and third harmonics in addition to f, so in order to remove them, the frequency f A resonant circuit R for resonating with the smoothing circuit 52 is inserted between the smoothing circuit 52 and the smoothing circuit 52. The output selected by the resonant circuit R is smoothed into direct current by the four diodes and conductors of the smoothing circuit 52 and sent to the level determination circuit 53. Here, in the bridge circuit 51, one line is connected in advance!
Select the values of each element RA + RB, Re, and C so that when the line is in the fall state, the unbalanced voltage is thicker than when it is in a normal state (when the line is not in 1jJi line). . Furthermore, when the relay drive circuit 43 described above operates, the delay circuit 44 operates based on the signal, and the signal from the delay circuit 44 is transmitted to the Blizz-Zo circuit 51 after the contact of the relay is closed.
After a certain time delay until the level becomes stable, the search signal is sent to the level determination circuit 53. The level determination circuit 53
The delay circuit 44 is composed of a comparison circuit that compares the unbalanced voltage sent from the litho 2 circuit 51 and the reference voltage.
It is activated only when the search signal is received from. A reference voltage is set in advance so that when the line is disconnected, the unbalanced voltage is higher than the reference voltage, and when it is normal, it is lower than the reference voltage.When it is normal, the next line disconnection detection is performed.
A start signal and a pulse stop signal are sent only when there is a disconnection abnormality. This noggle stop signal is transmitted to the contact switching control means 40! The signal is sent to the pulse generation circuit 41, and the pulse generation circuit 41 stops the pulse generation operation for a certain period of time, that is, the time until the security guard is notified that the telephone line at the address is disconnected. After the elapse of time, the pulse generating circuit 41 automatically generates a pulse again. At the same time, the activation signal is sent to the activation switch circuit 71 of the abnormality reporting device 7. The signal from the start timer circuit 71 is sent to the data generation circuit 72.
starts the headquarters telephone number storage circuit 73 which stores the telephone number of the security headquarters 2 in advance, and automatically dials the security headquarters 2 using the telephone line by the automatic dialing circuit 75. When the security headquarters is called, the polarity reversal detection circuit 74 is activated and the polarity is reversed. On the other hand, the signal from the address selection circuit of the contact switching means 4 is sent to the subscriber telephone number storage circuit 61 of the storage means 6 in which the subscriber telephone number is stored, and the address selected by the address selection circuit 42 is sent. The subscriber telephone number corresponding to is shifted into shift register 62. Further, after being sent to the shift register 62, the subscriber telephone number corresponding to the address selected by the address selection circuit 42 is sent to the vagina data generation circuit 72, so the data generation circuit 72 is disconnected to the security headquarters 2. You can report the telephone number and disconnection information using the telephone line. After completing the above operations, that is, ノ<? After a certain period of time has elapsed due to the pulse stop signal, the timer of the pulse generation circuit 41 automatically starts the next bird! When a break occurs, the process of detecting the next line disconnection is repeated in sequence.

FIG. 2 is a block diagram showing a modification of FIG. 1 of the line disconnection notification device of the present invention. In the same figure.

The contact switching means 3, the contact switching control means 41, the determining means 5, and the storage means 6 are the same as in the case of using the telephone line described above, but in this embodiment, the security headquarters 2 and the abnormality reporting means 8 are A dedicated line 10 directly connected as a communication line between
It has been established. In the abnormality notification means 8, in the case of a disconnection, a start signal is sent from the level determination circuit 53 to the start 1υ switch circuit 81 as described above. The signal from the activation switch circuit 81 is sent to the data generation circuit 82, and at the same time, the subscriber's telephone number information is received from the shift register 62 and an activation signal is sent to the data transmission circuit 83. The data transmission circuit 83 reports the telephone number of the disconnected subscriber and the disconnection information via the dedicated line 10. By using a dedicated line, compared to using a telephone line, the time required to call the security headquarters 2, wait for a response, and report a disconnection is shortened, and there is no need to make a wrong call by a third party.
Furthermore, when the telephone line is used, if the telephone line between the abnormality reporting means and the security tree is disconnected, it is no longer possible to report even if the disconnected subscriber is detected, which improves the security level.

FIG. 3 is a block diagram showing still another embodiment of the present invention, and the contact switching means 3, contact switching controller 1, hair 4, determination means 5, and storage means 6 are the same as in FIG. 1. However, in FIG. 3, the abnormality notification and command means 70 is
In addition to the abnormality reporting function of the above-mentioned abnormality reporting means to the security guard, it also has the function of receiving commands and issuing commands using a telephone line as a communication line from the security headquarters 2. As mentioned above, in the embodiments shown in FIGS. 1 and 2, the pulse of the /4' pulse generating circuit 41 is generated after a certain period of time has elapsed by a timer or the like, but in this embodiment, the pulse is generated by the security headquarters. 2, dials the abnormality notification and command means 70 using a telephone line and sends out a start signal according to a predetermined signal. In the abnormality notification and command means 70, the incoming call detection circuit 76 detects an incoming call from the headquarters, and the discrimination circuit 77 discriminates whether the call is from the security headquarters 2 or a third party's mistaken call. A circuit 79 sends a predetermined announcement to a third party.

*In the case of a call from the backup headquarters 2, the i4 Luz control circuit 7
8, a start or stop signal is sent from the circuit 78 to the pulse generation circuit 41 of the contact switching means 4, and in the case of a start signal, the pulse generation circuit 41 generates a trigger arm pulse and performs the above-mentioned pulse generation circuit 41. Start line notification operation.

4I\1 is a modified example of FIG. 3, and instead of receiving commands from the security headquarters 2 via the telephone line in FIG. A start signal or a stop signal is sent to the data receiving circuit 806 through the line 10, and in the case of a start signal, a start signal is sent from the Noyalus control circuit 808 to the Noyalus generating circuit 41, which causes υNO! The pulse generation circuit 41 generates a trigger signal and a pulse as described above, and starts the disconnection notification operation.

FIG. 5 is a block diagram showing still another embodiment of the present invention, in which the contact switching means 3, contact switching control means 4, and determination means 5 are the same as in the above case, but 1
In this embodiment, a display means 9 is provided, and a number of display sections 92, such as lamps, for example, are provided on the display means, the number of which corresponds to the number of subscribers for which a disconnection is detected.

The operation of the display means 9 is such that when a disconnection is detected by the determination means 5, an activation signal from the level determination circuit 53 is sent to the display drive circuit 91, and at the same time, a signal corresponding to the telephone number selected by the address selection circuit 42 is sent. The subscriber's display unit 92, such as a lamp, is displayed in response to a signal from the display drive circuit 91, and the disconnection abnormality is reported to the surrounding area. The display unit is not limited to a lamp, and may display by sound.

According to the present invention, it is possible to intensively and constantly inspect the telephone lines of a plurality of subscribers within a specific area, and in the event of a disconnection abnormality, it is possible to notify a specific headquarters or display an indication to the surrounding area.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a line disconnection notification device as an embodiment of the invention, FIG. 2 is a block diagram showing a modification of FIG. 1, and FIG. 3 is another embodiment of the invention. FIG. 4 is a block diagram showing a modification of FIG. 3; FIG. 5 is a block diagram showing a line disconnection notification device as a further embodiment of the present invention. (Explanation of symbols) 1... switching office, 2... security headquarters, 3... contact switching means, 4... contact switching control means, 5... determining means,
6... Storage means, 7, 8... Abnormality reporting means, 9...
・Display means, 10-... Dedicated line, 41... Threshold generation circuit, 42... Address selection circuit, 43... Relay drive circuit, 44... Delay circuit, 51... Buritsuno circuit, 52... Smoothing circuit, 53... Level determination circuit, 61... Subscriber telephone number storage circuit, 62...-Shift register, 70-... Abnormality notification and command means, 71
．． 81.801...Start switch circuit, 72,82,
802...Data generation circuit, 83.803...Data transmission circuit, 73-...Headquarters telephone number storage circuit, 74.
...Polarity reversal detection circuit, 75...Auto dial circuit,
76-... Incoming call detection circuit, 806... Data receiving circuit, 77... Discrimination circuit, 78, 808...! Luss control circuit, 79...Metsu Heage delivery circuit, 91...
Display driver, 92...display section.

Claims (1)

[Scope of Claims] 1. A contact switching means connected to a subscriber's telephone line, a contact switching control means for controlling opening and closing of the contact switching means, and a determining means for determining whether the line is disconnected or normal based on 11 voltage. ,
A storage means for storing a subscriber's telephone number and transmitting the subscriber's telephone number in response to a command, and an abnormality reporting means for reporting a disconnection abnormality detected by the determining means to a monitoring station through a communication line. Line disconnection notification device. 2. The line disconnection notification device according to claim 1, wherein a telephone line passing through an exchange is used as the communication line between the abnormality reporting means and the monitoring station. 3. The line disconnection notification device according to claim 1, wherein a dedicated line directly connecting the abnormality reporting means and the monitoring station is used as the communication line between the abnormality reporting means and the monitoring station. 4. A contact switching means connected to the subscriber's telephone line, a contact switching control means for controlling opening and closing of the contact switching means, a determining means for determining whether the line is disconnected or normal based on voltage, and storing the subscriber's telephone number. storage means for transmitting the subscriber's telephone number in response to a command; and a storage means for reporting the disconnection abnormality detected by the determination means to a monitoring station through a communication line, and for transmitting the telephone number of the subscriber in response to a command from the monitoring station through the communication line. A line disconnection notification device comprising abnormality notification and command means capable of sending a start or stop signal to the contact switching control means. 5. The line disconnection notification device according to claim 4, wherein a telephone line passing through an exchange is used as the communication line between the abnormality notification and command means and the monitoring station. 6. Line disconnection notification according to claim 4, wherein a dedicated line directly connecting the abnormality notification and command means and the monitoring station is used as the communication line between the abnormality notification and command means and the monitoring station. Device. 7. A contact switching means connected to the subscriber's telephone line, a contact switching control means for controlling opening and closing of the contact switching means, a determining means for determining whether the line is disconnected or normal based on voltage, and a voltage detected by the determining means. A line disconnection information system that is equipped with a display means that notifies disconnection abnormalities! .