JPH0720177B2 - Telephone line monitoring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides monitoring of a telephone line when a telephone or a key telephone device as a terminal device connected to the telephone line is temporarily broken. The present invention relates to a telephone line monitoring device capable of obtaining the data necessary for the cause analysis.

[Conventional technology]

As conventional techniques, there have been devices for testing communication lines and devices for diagnosing telephone devices.

[Problems to be Solved by the Invention]

However, in the case of a temporary failure, or when the failure is resolved by resetting the telephone device, the failure cannot be reproduced even if the failure repairer investigates after the failure occurs, so it is difficult to investigate the failure with the conventional apparatus. .

An object of the present invention is to preliminarily determine the state of a call line at the time of occurrence of an abnormality when a call is disconnected at the time of answering a call, or when it is declared that there is an unexplained failure such as abnormal sound or far talk occurring during the call. It is an object of the present invention to provide a telephone line monitoring device capable of accurately recording the data and providing the data necessary for analyzing the location of failure and the cause to the repair person.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides an input terminal section for accommodating a plurality of telephone lines to be monitored as channels, and a telephone line which is connected to the input terminal section and which telephone line belongs to which state change has occurred. A signal monitoring circuit for monitoring each channel, and a plurality of buffer circuits provided corresponding to the channels for capturing the state signal indicating the state of the telephone line for each channel via the input terminal portion, storing the state signals in time series, and outputting in order. A buffer extraction circuit for reading the output of each buffer circuit, a buffer extraction control circuit for controlling the buffer extraction circuit, a signal recording device for receiving and recording the buffer circuit output read by the buffer extraction circuit, and a control circuit A telephone line monitoring device was constructed by and.

[Action]

The control circuit is notified from the signal monitoring circuit of which channel the telephone line belongs to when the signal monitoring circuit detects a state change in the telephone line,
As a result, while activating the signal recording device,
The buffer extraction control circuit is instructed to instruct the buffer extraction circuit to read the output from the corresponding buffer circuit and send it to the signal recording device.

〔Example〕

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

In the figure, (1-1) to (1-L) are telephone lines, 2 is a button telephone device accommodating a plurality of telephone lines, and the main device 5 and extension telephones (6-1) to (6-1). m) is included. 3 is a telephone line monitoring unit, (8-1) to (8-
L) is an input wiring, 4 is a signal recording device (for example, magnetic tape device, disk device, RAM disk device, etc.), (7-
1) to (7-1) are wirings, and 16 is a remote circuit.

In this embodiment, the monitoring target is the key telephone device 2,
The telephone line (1-
1) to (1-L) are drawn into the telephone line monitoring unit 3 by the input wirings (8-1) to (8-L) and are constantly monitored. Inside the telephone line monitoring unit 3, the telephone line (1-1)
A (FIFO (First-In-First-Out)) buffer circuit is provided for each channel (1-L), and signals indicating the state of each telephone line are sampled in time series and stored as data. There is. Then, when a state change (actually voltage change or current change) occurs on a telephone line, such as an incoming call, a response to it, or an end of the call, This is detected by the signal monitoring circuit in the telephone line monitoring unit 3, and the signal recording device 4 is activated via the remote circuit 16 to start the signal recording operation.

Almost at the same time, the buffer circuit corresponding to the telephone line that has changed the state reads the data over time from a time point slightly before the state change occurs, and the corresponding wiring (7
If it is -1), it is sent to the signal recording device 4 via (7-1) and recorded.

As a result, the signal recording device 4 records the data before and after the state change, that is, if there is an incoming call, in time series. Therefore, if a temporary failure occurs at the time of incoming call, Data effective for the cause analysis can be obtained from the signal recording device 4.

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

In the figure, reference numeral 8 denotes an input terminal portion, and an input wiring (8
-1) to (8-L) are accommodated and connected to the next signal monitoring circuit 9. Reference numeral 10 is a buffer circuit, which corresponds to the channel of the telephone line to be monitored (10-1) to (10-L)
It consists of a FIFO (first in first out) type buffer circuit. Reference numeral 13 is a buffer extraction circuit, 11 is a buffer extraction control circuit, and 7 is an output terminal portion from which output wirings (7-1) to (7-n) are extended and connected to the signal recording device 4. Reference numeral 12 is a control circuit, and 14 is a trigger circuit (when the signal monitoring circuit 9 detects that a state change has occurred in any telephone line, that state change has occurred and the telephone line to which it belongs. It has a role of notifying the control circuit 12 that it has occurred), 15 is a command circuit, and 16 is a remote circuit having a role of activating the signal recording device 4.

FIG. 3 is a signal diagram showing an operating condition of each part of FIG.

FIG. 3A is a waveform diagram showing the signal level of the telephone line input from the input wiring (8-1), for example. The horizontal axis shows time. At first, it is in a steady state of -48V, and when there is an incoming call, the signal level rises from -48V to + 48V, and it is understood that state changes such as response and call termination occur in time series. Will.

FIG. 3B shows the data taken into the buffer circuit (10-1) for one channel in time series. That is, the data S1-1, S2-1, ..., S10-1, ... Obtained by sampling the signal levels shown in FIG.
It is shown that S20-1, ... Are sequentially fetched into the buffer circuit (10-1) like a FIFO. And Fig. 3 (a)
The sample data at the time of the state change of “incoming” of the signal level shown in (1) corresponds to S20-1.

FIG. 3C shows that the data written to the signal recording device 4 from the output wiring (7-1) is S10-1 or later among the time series data shown in FIG. 3B. Shows.

The circuit operation will be described below with reference to FIGS. 2 and 3.
While the signal monitoring circuit 9 was monitoring the telephone line signal level (a), it detected a state change called an incoming call. Therefore, it was confirmed that this occurred in the first channel (telephone line (1-1)). The control circuit 12 is notified as a trigger via the trigger circuit 14.

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 extraction control circuit 11 via the command circuit 15
The buffer extraction circuit 13 reads the sample data from the buffer (10-1) belonging to the first channel and sends it to the signal recording device 4 via the output wiring (7-1). As a result, the buffer circuit (10-1) to S1
The sample data from 0 to 1 (data before the state change called the incoming call occurs) is written in the signal recording device 4. How much before the sample data S20-1 corresponding to the incoming call is written in the signal recording device 4, the control circuit 12 issues a command to the command circuit 15 at any time after the trigger is input. Determined by the water mark.

Even if the signal recording device 4 is started and the motor for driving the magnetic tape starts to rotate, the signal recording device 4 cannot perform normal recording unless the motor rotation reaches a steady state. However, since the recording is started from the necessary data S10-1 before the sample data S20-1 corresponding to the incoming call, at the time of recording the really necessary sample data S20-1,
The motor rotation has also reached a steady state, and normal recording can be performed.

〔The invention's effect〕

As described above, according to the present invention, the required number of telephone lines are constantly monitored, and the monitoring data is temporarily accumulated in a time series for a certain period of time to cause a state change in the telephone line. Since at least the data after that including the time when the state change occurs can be recorded correctly, there is an advantage that accurate data necessary for the cause analysis can be obtained when a failure occurs.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing details of essential parts in FIG. 1, and FIG. 3 is a signal diagram showing an operating condition of each part in FIG. is there. Explanation of symbols (1-1) to (1-L) ... telephone line, 2 ... button telephone device, 3 ... telephone line monitoring unit, 4 ... signal recording device,
5 ... Button telephone main unit, (6-1) to (6-m) ...
Extension telephones, (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

Claims (1)

[Claims] 1. An input terminal section for accommodating a plurality of telephone lines to be monitored as channels and a telephone line connected to the input terminal section and monitoring which telephone line belongs to which channel has a state change. A signal monitoring circuit, a plurality of buffer circuits provided for each channel, which captures a status signal indicating the status of the telephone line for each channel via the input terminal section, stores them in time series, and outputs in that order, and each of the buffer circuits. A buffer extraction circuit for reading the output of the buffer, a buffer extraction control circuit for controlling the buffer extraction circuit, a signal recording device for recording the buffer circuit output read by the buffer extraction circuit as an input, and the signal monitoring circuit for a telephone line. When a state change is detected in, the signal monitoring of which channel the telephone line belongs to has occurred The buffer extraction circuit is notified so that the signal recording device is activated thereby, and 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. A telephone line monitoring device comprising: a control circuit for instructing.