JPH01319357A - Subscriber line interruption detection and notice system - Google Patents

Abstract

PURPOSE:To annunciate the result of detecting a broken line automatically even in the on-hook state by sending a monitor signal from a terminal equipment side to a subscriber line in the idle state of the subscriber line, that is, in the on-hook state of a telephone set and allowing an exchange side to detect the unreception of the monitor signal as the broken line. CONSTITUTION:A monitor signal fault detector 50 is connected to each of subscriber lines 20, 21, 22, 2N, 2S, identifies a potential difference of a DC voltage higher than a preset threshold value as the on-hook state, recognizes the unreception of the monitor signal having an audible frequency as the broken line and outputs fault information. An automatic dialer 60 indexes broken line information from the fault information outputted from the monitor signal fault detector 50, connects at least to one subscriber line, through which an exchange 10 is called and after a registered annunciation destination number is sent automatically and connected to the annunciation destination and the broken subscriber line information is sent. Thus, even in the on-hook state, the open subscriber line is detected automatically and annunciated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a subscriber line disconnection detection and notification system for detecting disconnection of a subscriber line to a telephone terminal and notifying a predetermined location.

[Conventional technology]

Conventional subscriber line disconnection detection and notification methods detect abnormalities such as when a subscriber whose line is disconnected uses another telephone to notify the failure, or when there is no response when calling the disconnected line. The system was such that the subscriber who made the call from the other line would be notified of the failure.

[Problem to be solved by the invention]

As mentioned above, the conventional subscriber line disconnection detection and notification system is configured so that after a general subscriber experiences and confirms that the line is unable to make or receive calls, the subscriber notifies the designated reception department by telephone, so it is easy to detect disconnection failures. There was a problem in terms of operational services, such as delays, which caused a great deal of inconvenience to subscribers.

An object of the present invention is to provide a subscriber line disconnection detection and notification system that solves the above problems by automatically detecting and notifying subscriber line disconnection.

[Means to solve the problem]

The subscriber line disconnection detection notification system according to the present invention has a telephone set as an unequipped terminal and a supervisory signal sending device connected to a subscriber line to which the telephone is connected, and a switch equipment that connects the subscriber line terminating the telephone set. It has a supervisory signal detection device and an automatic dialing device connected as a terminal to at least one subscriber line.

When the supervisory signal transmitting device receives on-hook state information from the telephone, it transmits a supervisory signal formed at a predetermined audio frequency to the connected subscriber line, while in the off-hook state it stops transmitting the supervisory signal.

The monitoring signal abnormality detection device is connected to each subscriber line, identifies a DC voltage potential difference higher than a preset threshold as an on-hook state of the telephone, recognizes failure to receive a monitoring signal at an audio frequency as a disconnection, and detects an abnormality. Output information.

The automatic dialing device indexes disconnected line information from the abnormality information output by the monitoring signal abnormality detection device, connects to at least one subscriber's line, calls the exchange, and automatically sends a pre-registered notification number. After dialing and connecting to the notification destination, the line information of the disconnected subscriber line is sent.

〔Example〕

Next, the subscriber line disconnection detection notification system of the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In FIG. 1, an exchange 1o as switching equipment accommodates and connects a subscriber line 20 and a trunk line 3o, as well as a notification line 31 which is equivalent to the trunk line 30 and connects to security equipment, security level, security company, etc. that notifies disconnection information. . The notification line 31 may be one of the subscriber lines 2o. The subscriber line 2o has a connection condition of terminating the telephone 40 as an unequipped end,
A telephone 4o is connected to the subscriber lines 21, 22 to 2N, and an automatic dialing device 60 is connected to the subscriber line 2s. Subscriber line 21 terminated by telephone 4o
-2N are connected to the monitoring signal abnormality detection device 50 and output abnormalities in the monitoring signal to the automatic dialing device 60.

The unequipped equipment is a telephone 40 that terminates on the subscriber line 21.
A supervisory signal transmitting device 41 is connected to the supervisory signal transmitting device 41, and an audible sound is supplied to the supervisory signal transmitting device 41 from an audible sound transmitter 42. The supervisory signal sending device 4o connects a supervisory signal in the form of an audible sound to the subscriber line 21 communication path.

FIG. 2 is a time chart showing an example of a monitoring signal on a subscriber line. The supervisory signal sending device 41 and the supervisory signal will be explained with reference to FIG. 2 and FIG. 1. The supervisory signal sending device 41 receives on-hook and off-hook information from the telephone 40, and connects the supervisory signal to the communication path of the subscriber line 21 during the on-hook state. The supervisory signal is generated by the supervisory signal sending device 41 using the audio frequency of the audible sound transmitter 42 as a predetermined intermittent audible sound.

FIG. 3 is a block diagram showing an example of a supervisory signal abnormality detection device. In FIG. 3, each subscriber line has an on-hook detection section 51, a supervisory signal abnormality detection section 52, and an AND circuit 53. The on-hook detection unit 51 is connected to the subscriber line 21
A high-impedance DC meter is connected to the communication path, and a DC voltage exceeding a predetermined threshold is measured to detect and detect an on-hook state. The supervisory signal abnormality detection unit 52 is connected to the communication path via a DC cutoff capacitor C, measures the duration time and disconnection time of the supervisory signal using audible sounds, detects an abnormality, and outputs the detected abnormality. In FIG. 3, information on signal interruption is output when audible sounds are not received, and information on signal failure is output when abnormal continuous reception of audible sounds is output. The AND circuit 53 is the on-hook detection section 51
Based on the signal disconnection information in the 0-on-hook state, a disconnection signal S1 is output to the subscriber line 21, and a disconnection signal SN is output to the subscriber line 2N. When the supervisory signal abnormality detection section 52 directly receives on-hook information from the on-hook detection section 51, the AND circuit 53 may be omitted. Although the signal abnormality information is commonly output to all subscriber lines as a fault signal SO and is distinguished from a disconnection notification, it may be output for each subscriber line.

Next, FIG. 4 is a functional block diagram showing an example of an automatic dialing device. The automatic dialing device will be described with reference to FIG. 4 and FIG. 1.

In FIG. 4, an automatic dial transmitting device 60 has an abnormality information receiving section 61, a calling section 62, a fault information memory 63, a notification customer register 64, and an automatic dial transmitting section 65. When the abnormality information receiving section 61 wants to receive at least one of the disconnection signals 81 to SN and the fault signal SO from the supervisory signal abnormality detection device 50, it drives the calling section 62 to issue a call from the subscriber line 2S, while receiving fault information. The selected signal, for example, the line information extraction address of the disconnection signal S1 is transmitted to the memory 63. The fault information memory 63 receives disconnection signals 81~
Fault information for the SN, such as disconnection fault notification and fault line number, and information such as supervisory signal abnormality notification for the fault signal SO, is registered and stored in advance, and when an address is received from the abnormality information receiving unit 61, the specified fault is detected. The information is output to the automatic dial sending section 65. The notification destination number register 64 stores in advance the telephone number of the notification destination to which an abnormality such as subscriber line disconnection is to be notified. For example, when the automatic dial sending unit 65 is driven by the line information memory 63 and receives trouble information indicating that the telephone number 200 is disconnected,
After the calling unit 62 confirms the call to the subscriber line 2S, it retrieves the dial number of the notification destination from the notification destination number register 64, automatically dials the notification destination number, and when the notification destination is connected. The fault information received from the fault information memory 63 is sent to the subscriber line 2S via the calling unit 62.

Although the supervisory signal and fault information have been described as being transmitted via a telephone line, a transmission system using a signal line may be used, and the present invention is not limited to the description of the above embodiments.

The supervisory signal abnormality detection device has been illustrated and explained as having an on-hook detection section and a supervisory signal abnormality detection section arranged for each subscriber line in FIG. It can be a means. Furthermore, although the supervisory signal has been described as being formed as an intermittent audible sound, the present invention is not limited to this format.

〔Effect of the invention〕

As explained above, according to the subscriber line disconnection detection notification system of the present invention, when the subscriber line is idle, that is, the telephone is on-hook, a monitoring signal is sent to the subscriber line from the unequipped side, and the switch By adopting a configuration that detects non-reception of a monitoring signal as a disconnection, it is possible to obtain the operational improvement effect of being able to automatically detect and notify a disconnection in an on-hook state.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the subscriber line disconnection detection notification method of the present invention, FIG. 2 is a time chart showing an example of a monitoring signal, and FIGS. 3 and 4 are partial details of FIG. 1. It is a functional block diagram showing an example. 10... Switchboard, 20, 21, 22.2N, 2
S...Subscriber line, 31...Notification line, 40...Telephone, 41...Monitoring signal sending device, 50...Monitoring Signal abnormality detection device, 6
0... Automatic dialing device. Figure 2 2I *3 Figure

Claims (1)

[Claims] In the subscriber line disconnection detection and notification method that detects disconnection of the subscriber line to a telephone terminal and notifies a predetermined location, the subscriber line disconnection detection and notification system detects disconnection of the subscriber line to a telephone terminal and notifies a predetermined location. The telephone has a supervisory signal sending device that sends a supervisory signal to the subscriber line and stops transmitting the supervisory signal in an on-hook state. monitors the DC voltage of the subscriber's line, and when this DC voltage shows a potential difference higher than a preset threshold, it is identified as an on-hook state of the telephone, and non-reception of the supervisory signal transmitted to the subscriber's line is determined to be a disconnection. A supervisory signal abnormality detection device that detects and outputs abnormality information; and a supervisory signal abnormality detection device that receives abnormality information from the supervisory signal abnormality detection device, extracts the line information of the disconnected subscriber line, and automatically transmits the information from at least one subscriber line to the exchange. and an automatic dialing device that automatically dials a pre-registered notification destination number, connects to a predetermined notification destination, and then transmits the extracted line information. Line disconnection detection notification method.