JPH02100555A - Disconnection informing device - Google Patents

Abstract

PURPOSE:To inform a prescribed place of disconnection information by searching a trunk line in a communicable state, and originating a call to an informing destination thorough this trunk line when the disconnection of the stored trunk line is detected. CONSTITUTION:The stored trunk lines 3 are provided respectively with disconnection supervising parts 10 so as to supervise the disconnection of the trunk line 3 due to breaking of wire, etc. Then, when the disconnection detection signal of the supervised office line 3 is inputted from the disconnection supervising part 10, the state of other trunk line is investigated, and if it is in an idle state, a trunk line trunk 40 is instructed through a channel control part 60 so as to dial-originate a call to the informing destination set beforehand (for instance, the police, a security company, etc.).

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a disconnection notification device that monitors and notifies disconnection of an accommodating station line.

[Prior Art] Conventionally, a private branch exchange (PBX) or key telephone device, etc., monitors disconnection of a central office line accommodated by disconnection, etc., and when a disconnection is detected, searches for a usable central office line and connects the central office to that station. There was no device that would automatically output a warning from the line.

[Problem to be solved by the invention] For this reason, even if the receiving station line is disconnected, there is no way to immediately know that it is disconnected, and when the user of the extension telephone picks up the handset and makes a call to the central office line, However, the abnormality was only noticed when the dial tone or dial tone from the telephone office, which would normally be audible, could not be heard. In recent years, there have been an increasing number of cases in which bank robbers and the like cut the containment line beforehand before invading the bank.

The present invention has been made in view of solving the above-mentioned problems, and when a disconnection of a housed office line is detected, a call-enabled office line is searched for, and a call is made from that office line to a notification unit to notify the user. The purpose of the present invention is to provide a disconnection notification device.

[Means for Solving the Problems] In order to achieve the above object, the disconnection alarm device of the present invention has the following features:
It has the following configuration. That is, it is a disconnection alarm device that accommodates at least two lines and has an outgoing line switching function, and includes a monitoring means for monitoring disconnection of the line, and inputting disconnection information from the monitoring means to indicate which line is in a usable state. The present invention includes a specifying means for specifying, and a notification means for notifying disconnection information from the line specified by the specifying means to a predetermined location.

[Operation] In the above configuration, disconnection of each line to be accommodated is monitored,
If you input the disconnection information, the line that is available for use will be identified.

It then operates to notify disconnection information from that line to a predetermined location.

[Embodiment] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[Description of the device (FIG. 1)] FIG. 1 is a block diagram of the disconnection notification device l in this embodiment, and as shown, an extension interface 30 that controls the extension telephone 2 and a central office line 3 are shown. A communication path 50 that forms a communication path between the office line trunk 40, extension line interface 30, office line trunk 40, etc., a communication path control unit 60 that controls the communication path 50, and a disconnection monitoring unit that monitors disconnection of the office line 3. 10, a notification section 2o that outputs an alarm etc. when the office line 3 is disconnected, and a central control section 70 that controls the entire device.

The central control unit 70 includes a CPU, a ROM that stores CPU processing procedures (described later), and a RAM that is used as a work area when the CPU executes processing.
A plurality of extension telephones 2 and two or more central office lines 3 are controlled through the communication path control unit 60 so that they can be used efficiently.

[Description of Disconnection Monitoring Unit (Figs. 2 and 3) Next, an example of the disconnection monitoring unit 10 in this embodiment will be explained using the window/disconnection monitoring unit 10 in Fig. 2.
This will be explained below with reference to the comparator circuit and the operational relationship diagram of FIG.

First, the disconnection monitoring unit 10 of this embodiment monitors all voltage values such as the idle state and call status of the telephone line, and if the voltage value is an abnormal voltage value due to a disconnection of the telephone line, the central control unit 70 Outputs an on signal as disconnection information to

Next, an overview of the operation of the voltage comparator will be explained, focusing only on the comparator 16 of the window comparator circuit shown in FIG.

As an input to the comparator 16, if the voltage value of the telephone line is Vin, the voltage value set by the resistor 12 is Vref, and its output Vout, then Vout is on when Vin<Vref, and Vout is on when Vin>Vref. outputs off, and when Vout turns on, the relay (Ry) is driven.

A window comparator circuit shown in FIG. 2 is a circuit in which the operating point can be arbitrarily set by combining it with an arithmetic circuit.

In this circuit, FIG. 3 is a diagram showing the relationship between the voltage values corresponding to each use state of the telephone line and the output of the disconnection monitoring section 10, and the operation will be described below with reference to FIG.

It is known that the voltage value of a normal telephone line in an idle state is 48V, and that it drops to about 4V to 20V in a call state depending on the impedance of the telephone. Therefore, the abnormal voltage values in this example are 3V or less and 21V to 21V.
There are two ranges for each 47V. Then, a second
This is done using the resistors 12 and 14 shown in the figure, and the output signal is turned on by the resistor 12 and turned off by the resistor 14.

As shown in FIG. 3, if the telephone line is idle, the voltage value is 48V, and the output signal at that time is off.

Then, when the phone enters the call state due to an incoming call,
The voltage value changes from 4 to 20V, but the output signal remains off.

However, if Ll and L2 of the telephone line are cut at the same time with metal scissors, etc., the voltage value will immediately drop below 3V due to the short circuit of the telephone line, and the output signal for that voltage value will be
Turns on. However, telephone line L1. When either one of L2 is disconnected, it takes about 20 seconds for the voltage value to reach 0 due to discharge of the capacitor inside the device or the telephone. For this purpose, for example, if the telephone line is idle, the voltage value gradually decreases from 48V to 47V, and the output signal is turned on at 46V.

In this embodiment, a disconnection monitoring unit 1 is provided for each of the station lines 3 to be accommodated.
0 is provided to monitor disconnection of the office line 3 due to disconnection or the like.

When the disconnection detection signal of the monitored station line 3 is input from the disconnection monitoring unit 10, the status of other station lines is checked, and if the line is vacant, the notification is sent to a preset destination (for example, the police, security company, etc.). An instruction is given to the office line trunk 4o via the communication path control unit 60 to make a dial call. If there is a response from the notification destination, the central office line trunk 40 and the notification section 2o are connected via a communication path 50. The connected notification unit 20 then outputs a voice message previously stored in a cassette tape, IC memory, etc. to the notification destination to notify that the central office line 3 accommodated therein has been disconnected.

Further, the notification unit 20 can also notify that the monitored station line 3 is disconnected by using a buzzer, a lamp, or the like. For example, abnormality processing, such as when all the housed office lines are disconnected, is notified by a buzzer or the like.

Furthermore, if each extension telephone is equipped with a liquid crystal display device or the like, a disconnection message may be displayed on the display device.

For example, abnormality processing such as when all the housed office lines are disconnected is notified by a buzzer or the like.

[Description of Processing Procedure (FIG. 4)] Next, the processing procedure of the central control unit 70 in this embodiment will be described below with reference to the flowchart shown in FIG.

First, when a disconnection detection signal due to disconnection of the monitored central office line 3 is inputted from the disconnection monitoring unit 10, the process proceeds to step SI.
Proceeding to step S12 from O, the notification process is started. Then, in step SL2, each disconnection monitoring unit 10
From this state, another station line 3 that is not disconnected is searched. Next, the result is determined in step S14, and if there is a usable office line 3, the process advances to step S16. However, if all the station lines 3 are disconnected, abnormality processing is performed to notify the disconnection with a buzzer lamp or the like as described above, and the process is terminated. Next, in step S16, a central office line acquisition instruction is output to the communication path control section 60. It should be noted that this central office line acquisition instruction is outputted with a parameter obtained by converting the available central office line 3 into a logical number corresponding to the central office line trunk 40 controlled by the communication path control unit 60.

Next, in step S18, the acquisition result of the office line trunk 40 is waited for from the communication path control unit 60, and the acquisition result of the office line trunk 40 is waited for.
If it is vacant, in step S20, a preset notification destination telephone number is designated and a dialing instruction is output. However, if the central office line trunk 40 cannot be acquired in the acquisition process in step S16, the process returns to step S12 in order to search for another central office line 3.

On the other hand, if the central office line trunk 40 has been captured and a dialing instruction has been output, a response from the other party from the central office line trunk 40 is waited for in step S22, and if the notified party responds, in step S24, the notification unit 20 and Office line trunk 4
In order to form a communication path with 0, a connection instruction is output to the communication path control section 60. This instruction forms a communication path,
The notification process by the notification unit 20 described above is executed.

In this embodiment, the abnormality processing is performed only when all the housed station lines are disconnected, but the abnormality processing may be performed in parallel when the disconnection detection unit 10 detects a disconnection. good.

According to this embodiment, when the accommodated central office line is disconnected, it is possible to automatically notify a preset notification destination using the available central office line.

[Effects of the Invention] As described above, when a disconnection of the accommodated office line is detected, a call-enabled office line is searched for, and a call can be made from that office line to the destination for notification.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a disconnection notification device according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing an example of a disconnection monitoring unit 10 in this embodiment, and FIG. 3 is a circuit diagram showing an example of a disconnection monitoring unit 10 in this embodiment. FIG. 4 is a flowchart showing the processing procedure in this embodiment. In the figure, 1...disconnection alarm device, 2...extension telephone, 3
...Publication line, 30...Extension line interface, 40...
- Office line trunk, 50... Call path, 60... Call path control unit, IO... Disconnection monitoring unit, 20... Notification unit, 7
0...Central control unit.

Claims (1)

[Scope of Claims] A disconnection alarm device that accommodates at least two lines and has an outgoing line switching function, comprising a monitoring means for monitoring disconnection of the line, and can be used by inputting disconnection information from the monitoring means. 1. A disconnection warning device comprising: identifying means for identifying a line in a state; and reporting means for notifying disconnection information from the line identified by the identifying means to a predetermined location.