JPH01290355A - Telephone line monitor device - Google Patents

Abstract

PURPOSE:To obtain a data required for analysis of a cause by monitoring a telephone line in case of a tentative fault of a telephone set or a key telephone system or the like as a terminal equipment connecting to the telephone line. CONSTITUTION:Telephone lines 1-1 to 1-L housed in a key telephone system 2 are drawn to a telephone line monitor section 3 by input wires 8-1 to 8-L and always monitored. When any state change such as an incoming call or end of call takes place in the telephone line, it is detected by a signal monitor circuit in the telephone line monitor section 3, a signal recorder 4 is started via a remote circuit 16 to start signal recording. Simultaneously, a secular data from a point of time a little before the state change is read from a buffer circuit corresponding to the telephone circuit having the state change and sent and recorded in the signal recorder 4 via the wire 7-1 corresponding thereto. As a result, a data before and after the point of time when the state change takes place is recorded in the signal recorder 4 in time series.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for monitoring the telephone line in the event of a temporary failure of a telephone, key telephone device, etc. as a terminal device connected to the telephone line. This invention relates to a telephone line monitoring device that can obtain the data necessary for analyzing the cause.

[Conventional technology]

Conventional technology includes devices for testing communication lines and devices for diagnosing telephone equipment.

[Problem to be solved by the invention]

However, in the case of a temporary failure or when the failure is resolved by resetting the telephone equipment, it is difficult to investigate the failure with conventional equipment because the failure cannot be reproduced even if a repair person investigates after the failure occurs. be.

The purpose of the present invention is to accurately determine the state of the telephone line at the time of occurrence of an abnormality when a call is disconnected when answering a telephone call or an abnormal sound or combination of words occurs during a call. To provide a telephone line monitoring device capable of recording data on a fault and providing data necessary for analyzing the location and cause of a fault to a fault repair person.

[Means to solve the problem]

In order to achieve the above object, the present invention includes an input terminal section that accommodates a plurality of telephone lines to be monitored as channels, and a telephone line that is connected to the input terminal section and that identifies which channel a state change has occurred in the telephone line that is connected to the input terminal section and belongs to which channel. a signal monitoring circuit that monitors each channel for each channel, and a plurality of buffer circuits provided for each channel that captures status signals indicating the status of the telephone line via the input terminal section for each channel, stores them in chronological order, and outputs them in that order. , a buffer extraction circuit that reads the output of each of the buffer circuits, a buffer extraction control circuit that controls the buffer extraction circuit, a signal recording device that receives and records the buffer circuit output read by the buffer extraction circuit, and a control circuit. A telephone line monitoring device was constructed.

[Effect]

When the signal monitoring circuit detects a state change in the telephone line, the control circuit is notified from the No. 13 monitoring circuit to which channel the state change has occurred in the telephone line, and accordingly causes the signal recording device to start up. At the same time, the buffer extraction control circuit is instructed to read the output from the corresponding buffer circuit and send it to the signal recording device. FIG. 2 is a block diagram showing one embodiment.

In the figure, (1-1) to (1-L) are respective telephone lines, and 2 is a button telephone device accommodating a plurality of telephone lines, including a main device 5 and extension telephones (6-1) to (6-1). m). 3 is a telephone line monitoring section, (8-1) to (8-
L> is input wiring, 4 is a signal recording device (e.g. magnetic tape device, disk device, RAM disk device, etc.), (7-
1) to (7-1) are wiring, and 16 is a remote circuit.

In this embodiment, the object to be monitored is a button telephone device 2,
The telephone line (1-1) accommodated in the button telephone device 2
) to (1-L) are drawn into the telephone line monitoring unit 3 through input wiring (8-1) to (8”L) and are constantly monitored. Inside the telephone line monitoring unit 3, the telephone line (1-L) -1)～
(1-L) FIFO (first
A buffer circuit of the in-first-out type is provided, and signals indicating the status of each telephone line are sampled in time series and stored as data. In the telephone line, changes in status (actually changes in voltage or current) such as an incoming call, a response to it, or the end of a call
When this occurs, the signal monitoring circuit in the telephone line monitoring section 3 detects this and activates the signal recording device 4 via the remote circuit 16 to start the signal recording operation.

At almost the same time, data over time from a moment before the state change B is read out from the buffer circuit corresponding to the telephone line where the state change occurred, and the corresponding wire (7
-1), the signal is sent to the signal recording device 4 via (7-1) and recorded.

As a result, the signal recording device 4 records data in chronological order before and after the time when the status change (if a call is received) occurs, so if a temporary failure occurs when a call is received, etc. Data useful for analyzing the cause can be obtained from the signal recording device 4.

FIG. 2 is a block diagram showing details of the telephone line monitoring section 3 in FIG. 1.

In the figure, 8 is an input terminal section, and input wiring (8
-1) to (8-L), and is connected to the next signal monitoring circuit 9. 10 is a buffer circuit, which corresponds to the channels of the telephone line to be monitored (10-1) to (1).
It consists of a FIFO (first-in-first-out) buffer circuit of 0-L). 13 is a buffer extraction circuit, 11 is a buffer extraction control circuit, and 7 is an output terminal section from which output wiring (7-1) to (7
-n) is extended and connected to the signal recording device 4.

12 is a control circuit; 14 is a trigger circuit (when the signal monitoring circuit 9 detects that a state change has occurred in any telephone line, it is determined that the state change has occurred;
15) has the role of informing the control circuit 12 of the telephone line to which the incident occurred.
1 is a command circuit, and 16 is a remote circuit which has the role of starting the signal recording device 4.

FIG. 3 is a signal diagram showing the operating status of each part in FIG. 2.

FIG. 3(a) is a waveform diagram showing the signal level of a telephone line input from, for example, the input wiring (8-1). The horizontal axis is time. At first, it is in a steady state of -48V, and then when a call arrives, the signal level changes from -48V to +
It will be understood that state changes such as rising to 48V, followed by response, termination, etc. occur in chronological order.

Figure 3 (b) shows the buffer circuit as one channel (
10-1) shows data taken in in chronological order. That is, data 5l-1, 32-1, . . . obtained by time-series sampling of the signal levels shown in FIG.
・, 310-1. ...520-1. . . are sequentially taken into the buffer circuit (10-1) in a FIFO manner. The sample data at the time when the signal level changes to "incoming call" shown in FIG. 3(a) corresponds to 520-1.

Figure 3 (c) shows the output layout! (7-1) indicates that the data written to the signal recording device 4 is after 310-1 in the time-series data shown in FIG. 3(b).

Hereinafter, the circuit operation will be explained with reference to FIGS. 2 and 3.

While monitoring the telephone line signal level (A), the signal monitoring circuit 9 detects a change in the status of an incoming call, and therefore detects that this has occurred on the first channel (telephone line (1-1)). , is notified to the control circuit 12 via the trigger circuit 14 as a trigger.

Then, the control circuit 12 immediately activates the signal recording device 4 via the remote circuit 16 to start the signal recording operation. On the other hand, the buffer (10-1) belonging to the first channel is sent to the buffer extraction control circuit 11 via the command circuit 15.
) instructs the buffer extraction circuit 13 to read the sample data and send it to the signal recording device 4 via the output wiring (7-1). As a result, the buffer circuit (10
-1) to 5IO-1 and subsequent sample data (data from before the state change of incoming call occurs) is written to the signal recording device 4. How far back the sample data 520-1 corresponding to the incoming call should be written into the signal recording device 4 is determined by the point at which the control circuit 12 issues a command to the command circuit 15 after the trigger is input. Determined by water.

Even if the signal recording device 4 is activated and, for example, a motor for driving a magnetic tape starts rotating, normal recording cannot be performed unless the motor rotation reaches a steady state. However, since recording starts from data 5IO-1, which is before the necessary sample data 520-1 corresponding to the incoming call, the motor rotation is also in a steady state at the time when the really necessary sample data 520-1 is recorded. has been reached and normal recording can be performed.

〔Effect of the invention〕

As explained above, according to the present invention, a required number of telephone lines is constantly monitored, and the monitoring data is temporarily accumulated in chronological order over a certain period of time, so that a change in the state of the telephone line occurs. Since it is possible to correctly record at least the data after the time when the state change occurred, there is an advantage that when a failure occurs, accurate data necessary for analyzing the cause of the failure can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a block diagram showing details of the main parts in Fig. 1, and Fig. 3 is a signal diagram showing the operating status of each part in Fig. 2. be. Explanation of symbols (1-1) to (1-L)...Telephone line, 2...Button telephone device, 3...Telephone line monitoring section, 4...Signal recording device, 5...Button Telephone main device, (6-1) to (6
-m)...extension telephone, (7-1) to (7-n)...
- Output wiring, 8... Input terminal section, 9... Signal monitoring circuit, 10... Buffer circuit, 11... Buffer extraction control circuit, 12... Control circuit, 13... Buffer extraction circuit , 14... trigger circuit, 15... command circuit,
16... Remote circuit agent Patent attorney Akio Namiki Patent attorney Kiyoshi Matsuzaki

Claims (1)

[Scope of Claims] 1) An input terminal section that accommodates a plurality of telephone lines to be monitored as channels, and an input terminal section for accommodating a plurality of telephone lines to be monitored as channels, and a channel for determining whether a state change has occurred in a telephone line connected to the input terminal section and belonging to which channel. a signal monitoring circuit that separately monitors; a plurality of buffer circuits provided for each channel that captures status signals indicating the status of the telephone line via the input terminal section for each channel, stores them in chronological order, and outputs them in that order; a buffer extraction circuit that reads the output of each buffer circuit; a buffer extraction control circuit that controls the buffer extraction circuit; a signal recording device that receives and records the buffer circuit output read by the buffer extraction circuit; and the signal monitoring circuit. When detecting a state change in the telephone line, the signal monitoring circuit notifies the telephone line to which channel the state change has occurred, and thereby activates the signal recording device and also activates the buffer extraction control circuit. A telephone line monitoring device comprising: a control circuit that instructs the buffer extraction circuit to read the output from the corresponding buffer circuit and send it to the signal recording device.