JP2655484B2 - Switching line abnormality monitoring system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line abnormality monitoring system for an exchange, and more particularly to a line abnormality monitoring system for a wired communication exchange.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing a configuration example of a conventional line abnormality monitoring system.

Conventionally, a line abnormality monitoring system of an exchange has
As shown in FIG. 3, a plurality of line terminals 200a to 200n
A first insertion unit 210 for connecting a failure detection bit A at a predetermined time position of transmission data transmitted from any of the line terminals 200a to 200n, and a first insertion unit. A first extraction means 220 connected to the means 210 via a data highway and for extracting a failure detection bit B from a predetermined time position of the transmission data transmitted from the first insertion means 210; A second insertion unit 230 that is connected and inserts the failure detection bit B extracted by the first extraction unit 220 again at a predetermined time position in the transmission data; and a second insertion unit 2
30 is connected via a data highway and connected to each of the line terminals 200a to 200n, and a second extracting means for extracting a failure detection bit C from a predetermined time position of the transmission data transmitted from the second inserting means 230 240, and a comparing unit 250 for comparing the failure detection bit A inserted by the first insertion unit with the failure detection bit C extracted by the second extraction unit 240.

In the comparison means 250, when the failure detection bit A and the failure detection bit C match,
The line of the exchange was judged to be normal (Japanese Patent Application Laid-Open
-65556).

[0005]

However, in the above-described conventional line abnormality monitoring system of the exchange, when checking the normality of the line, the failure detection bit is transmitted using a predetermined time position of a part of the highway data. Since it is necessary to individually test the normality of the line because the data is sent as data, there is a problem that it takes time to perform the test.

Further, even when a normality test of a line is individually performed during a call, a failure detection bit must be assigned to highway data, so that the transmission amount of voice data is reduced and the transmission efficiency of voice data is reduced. There is also a problem.

Therefore, the present invention has been made in view of the above-mentioned problems of the prior art, and it is possible to reduce the test time by simultaneously monitoring the abnormality of each line, and furthermore, even during a call. It is an object of the present invention to provide a line abnormality monitoring system for an exchange, which can monitor the normality of a line without lowering the transmission efficiency of voice data.

[0008]

To achieve the above object, the present invention provides a plurality of line terminals for transmitting and receiving voice data,
A line trunk unit that is connected to each of the line terminals and performs analog-to-digital conversion of audio data when it is on the transmitting side and converts digital-to-analog conversion of audio data when it is on the receiving side; When it becomes the transmission side, it rewrites a part of the audio data to the line abnormality detection data when it becomes the transmission side, and when it becomes the reception side, it takes out the line abnormality detection data and rewrites it on the transmission side. A line abnormality detection unit that detects a line abnormality by comparing with data, and each of the line abnormality detection units is connected, and performs time-division multiplexing processing on audio data transmitted from the transmission-side line abnormality detection unit. A time-division multiplexing switch for assigning to a line abnormality detection unit on the receiving side , wherein the line abnormality detection unit
The part where the data for normal detection was extracted is based on the data before and after.
Playback in a form close to the original audio data
You.

[0009]

[0010]

According to the present invention constructed as described above, audio data transmitted from some of the plurality of line terminals is converted into analog / digital signals by line trunk units connected to the respective line terminals. Then, the data is sent to the line abnormality detecting unit connected to each line trunk unit.

In these line abnormality detection units, a part of the audio data is rewritten to line abnormality detection data.
The voice data, part of which has been rewritten to the line abnormality detection data, is sent to the time division multiplex switch unit to which each line abnormality detection unit is connected. The time division multiplexing switch unit performs time division multiplexing processing on the voice data transmitted from the line abnormality detection unit on the transmission side, and assigns it to the line abnormality detection unit on the reception side.

[0012] Then, the line abnormality detecting unit on the receiving side is
The line abnormality is detected by extracting the line abnormality detection data from the voice data partially rewritten to the line abnormality detection data and comparing the extracted data with the abnormality detection data rewritten on the transmission side. That is, if the line abnormality detection data rewritten on the transmission side does not match the line abnormality detection data extracted on the reception side, it is determined that there is an abnormality in the line.

[0013] Further, the line abnormality detection unit on the receiving side reproduces the portion from which the line abnormality detection data has been extracted in a manner close to the original audio data based on the preceding and following data, and then transmits the reproduced audio data. .

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an internal configuration of an embodiment of a line abnormality monitoring system for an exchange according to the present invention.

As shown in FIG. 1, a line abnormality monitoring system for an exchange according to the present embodiment includes a plurality of telephone line terminals 100a to 100n for transmitting and receiving voice data, and a line connected to each of the telephone line terminals 100a to 100n. The trunk units 110a to 110n and each line trunk unit 11
Line abnormality detectors 1 connected to 0a to 110n respectively
20a to 120n and a plurality of line abnormality detection units 120a to 120n
A time division multiplexing switch unit 130 to which 120n is connected;
It is composed of

The above line trunk units 110a to 110
n is for converting audio data transmitted as an analog signal into a digital signal when it is on the transmitting side, and converting audio data of the digital signal into an analog signal when it is on the receiving side. In addition, the line trunk unit 110 (n +
1) When sending a signal to another exchange, the voice data of a digital signal is converted into an analog signal when it becomes a transmitting side, and the voice data of an analog signal is converted into a digital signal when it becomes a receiving side. Is what you do.

The line abnormality detectors 120a to 120n rewrite a part of the voice data to line abnormality detection data at a specific timing when the transmission side is set, and the line abnormality detection data when the reception side is set. Line errors are detected by comparing the data with the error detection data rewritten on the transmitting side, and the portion where the line error detection data was extracted is reproduced in a form close to the original audio data based on the preceding and following data. Is what you do.

The time-division multiplexing switch unit 130 performs time-division multiplexing processing on voice data transmitted from the line abnormality detecting unit on the transmitting side, and assigns it to the line abnormality detecting unit on the receiving side.

Next, a processing procedure for detecting a line abnormality in the present embodiment will be described.

In FIG. 1, a telephone line terminal 100a
When a call is made from the telephone line terminal 100b to another telephone line terminal 100b, voice data, which is an analog signal from the telephone line terminal 100a, is converted into a digital signal by the line trunk unit 110a and sent to the line abnormality detection unit 120a. A part of the audio data converted into the digital signal is rewritten to the line abnormality detection data at a specific timing by the line abnormality detection unit 120a, and the time division multiplex switch unit 1
Sent to 30.

In the time-division multiplexing switch unit 130, not only the voice data from the line abnormality detection unit 120a but also part of the data transmitted from the other line abnormality detection units 120b to 120n is rewritten to line abnormality detection data. The audio data is combined into one piece of data separated by time and assigned to each receiving line.

In this way, the voice data from the telephone line terminal 100a on the transmitting side is transmitted to the line terminal 1 on the receiving side.
It is sent to the line abnormality detection unit 120b provided for the line to 00b.

In the line abnormality detecting section 120b, the line abnormality detecting data in the voice data, which is partially rewritten at a specific timing, is extracted on the receiving side and rewritten by the line abnormality detecting section 120a on the transmitting side. The normality of the line of the exchange is determined by comparison with the line abnormality detection data at that time.

That is, the information of the line abnormality detection data at the time of rewriting at the transmission side is
a to 120n, the line abnormality detection data held by the line abnormality detection units 120a to 120n during transmission, and the line abnormality detection data extracted by the line abnormality detection units 120a to 120n during reception. , It can be determined whether the data has been correctly received.

As a result of the above comparison, if the line abnormality detection data rewritten on the transmission side does not match the line abnormality detection data extracted on the reception side, it is determined as a line failure.

Thereafter, the line abnormality detector 1 of the line on the receiving side
At 20b, a part of the audio data from which the line abnormality detection data is extracted is reproduced in a form close to the original audio data based on the audio data before and after the data and transmitted to the line trunk unit 110b.

Here, a description will be given of a procedure for reproducing a part of the audio data from which the above-mentioned line abnormality detection data has been extracted.

FIGS. 2A and 2B are diagrams for explaining the reproduction process of the audio signal. FIG. 2A shows the audio signal at the time of transmission, and FIG. 2B shows the audio signal before the reproduction process is performed on the receiving side.

When transmitting an audio signal having an analog waveform as shown in FIG. 2A, it is assumed that part b is rewritten to data for detecting line abnormality (FF in digital). On the receiving side, a digital signal corresponding to an audio signal having an analog waveform as shown in FIG. 2B is received, and the normality of the line can be determined by finding and extracting the portion b ′.

If the b ′ part is converted from digital to analog by the pulse code modulation method as it is, noise will occur. Therefore, the above-mentioned line abnormality detecting part converts the signal of the b ′ part into an intermediate level between the a part and the c part. And reproduces a signal equivalent to the original audio signal.

[0032]

Since the present invention is configured as described above, the following effects can be obtained.

According to the first aspect of the present invention, a line abnormality detecting unit is provided for each line terminal via a line trunk unit, and voice data from the line abnormality detecting unit corresponding to the transmitting side is collected into one, and the line switching is performed. And a time-division multiplexing switch unit assigned to the line abnormality detection unit on the receiving side eliminates the need to individually test the line normality for line abnormality detection. Can be detected at the same time. For this reason, the time for testing the normality of the line can be reduced.

According to the second aspect of the present invention, in addition to the above-described effects, the portion from which the line abnormality detecting data is extracted is reproduced on the receiving side in a form close to the original audio data based on the preceding and following data. By transmitting to the receiving line terminal, the normality of the line can be monitored even during a call.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an internal configuration of an embodiment of a line abnormality monitoring system for an exchange according to the present invention.

FIGS. 2A and 2B are diagrams for explaining a reproduction process of an audio signal, in which FIG. 2A shows an audio signal at the time of transmission, and FIG. 2B shows an audio signal before performing a reproduction process on a receiving side;

FIG. 3 is a block diagram showing a configuration example of a conventional line abnormality monitoring system.

[Explanation of symbols]

100a-100n Telephone line terminal 110a-110n, 110 (n + 1) Line trunk unit 120a-120n Line abnormality detection unit 130a-130n Time division multiplex switch unit

Claims (1)

(57) [Claims] 1. A plurality of line terminals for transmitting and receiving voice data, each being connected to each of the line terminals, converting voice data from analog to digital when becoming a transmitting side, and voice data when becoming a receiving side. And a line trunk unit for digital-to-analog conversion. The line trunk unit is connected to each of the line trunk units. When the transmission side is selected, a part of the voice data is rewritten to line abnormality detection data. A line abnormality detection unit that detects line abnormality by extracting the line abnormality detection data and comparing it with the abnormality detection data rewritten on the transmission side; and each of the line abnormality detection units is connected to detect a line abnormality on the transmission side. and division multiplex process at a voice data sent from the parts, and a time division multiplex switch unit for assigning the line abnormality detecting unit which becomes the receiving side, the Each line error detector is for detecting line errors on the receiving side.
Based on the data before and after,
A line abnormality monitoring system for exchanges , characterized in that the data is reproduced in a form similar to voice data .