JPH012457A - Subscriber line monitoring device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] A plurality of characteristic values determined for a subscriber line are polled and measured at fixed intervals within a fixed period of time, and the measured values are compared with corresponding reference values. It detects intermittent faults in subscriber lines by determining pass/fail, recording the time of fault occurrence, fault items, etc.
This makes maintenance work easier and more efficient.

[Industrial application field]

The present invention relates to a subscriber line monitoring device that monitors the status of subscriber lines for a certain period of time and detects intermittent failures.

In the subscriber lines of exchanges, there are many faults in which the voltage or resistance between the lines and between the lines and the ground becomes abnormal intermittently, and it is extremely difficult to detect such events.

Therefore, it is desired to provide a subscriber line monitoring device that monitors the status of subscriber lines for a certain period of time, captures and records intermittent failures, and facilitates maintenance work.

[Prior art and problems to be solved by the invention] Conventional subscriber line monitoring involves the use of measuring instruments for measuring the voltage and resistance between the A and B lines, and the A and ground lines. A measuring device that measures the voltage and resistance between air and a measuring device that measures voltage and resistance between the B line and the ground air can be connected individually to switch measurement items and record failures that occur intermittently within a certain period of time. is performed manually.

In such monitoring, there are problems in that it is troublesome to connect each measuring device, requires a long time of labor, and maintenance work is inefficient and difficult.

[Means for solving problems]

FIG. 1 is a block diagram of the principle of the present invention.

In Figure 1, 1 is a subscriber line monitoring device according to the present invention.

2 is a subscriber line that the subscriber line monitoring device 1 measures.

10 is a measuring section provided in the subscriber line monitoring device 1 according to the present invention.

13 is a digital conversion means provided in the subscriber line monitoring device 1 according to the present invention.

Reference numeral 14 denotes a signal distribution section provided in the subscriber line monitoring device 1 according to the present invention.

15 is a processing section provided in the subscriber line monitoring device 1 according to the present invention.

150 is a reference value table provided in the processing section 15 according to the present invention.

Reference numeral 151 denotes measurement recording processing means provided in the processing section 15 according to the present invention.

[Effect]

The measurement unit 10 measures a plurality of types of characteristic values defined for the subscriber line 2.

The digital conversion means 13 digitizes the analog measurement value measured by the measurement unit 10.

The signal distribution section 14 sends out a control j''B signal that causes the measurement section 10 to select a characteristic value to be measured.

The processing unit 15 includes a reference value table 150 and a measurement record processing means 1.
51, the reference value table 150 stores reference values corresponding to each measurement value, and the measurement record processing means 151 includes:
Each measured value digitized by the digital conversion means 13 is recorded, and each recorded measured value is compared with each reference value stored in the reference value table 150 to determine whether or not there is a fault. If so, record the time of occurrence and the failure item.

Using such a subscriber line monitoring device, it is possible to periodically measure various characteristic values of the subscriber line within a certain period of time, and automatically record the time and items of failure occurrence, so that manual measurement is not necessary. The hassle and inefficiency of switching items and long-term monitoring are eliminated, and maintenance work is made easier and more efficient by detecting intermittent failures in subscriber lines.

〔Example〕

The present invention will be specifically explained below with reference to illustrated examples.

FIG. 2 is a block diagram of a subscriber line monitoring device according to an embodiment of the present invention, FIG. 3 is an explanatory diagram of a reference value table, and FIG. 4 is a flowchart of a measurement recording program and a fault recording program. Steps S1 to 327 in FIG. 4 represent a measurement recording program, and steps 350 to S55 represent a failure recording program. The same reference numerals indicate the same objects throughout the figures.

In FIG. 2, the line-to-line measuring circuit 16. A line measurement circuit 1
7 and B line measuring circuit 18 are the line measuring section 10 of FIG.
The selector 130 and the analog/digital conversion circuit (hereinafter referred to as A/D) 131 correspond to the digital conversion means 13 in FIG.
(referred to as PU)152. Memory section 153. Operation unit 158.
The bus 160 and the display section 159 correspond to the processing section 15 in FIG. 1, and the measurement value recording area 154. Failure record area 15
5. The measurement record program 156 and the failure record program 157 correspond to the measurement record processing means 151 in FIG.

When the operation unit 158 is used to set necessary items such as a certain period of time for subscriber line monitoring and a timing time that determines the cycle of measurements to be performed within the certain period of time and the start button is pressed, the MPU 15
2 reads the above-mentioned fixed time, timing time, and setting items, and as shown in FIG. 4, performs the subscriber line monitoring operation described below using the measurement recording program 156 and the like.

The MPU 152 uses the measurement recording program 156 to select between the line measurement circuit (hereinafter referred to as ABM) 16 and the selector 130.
(ABM16 is selected at the start of operation) through A/
The voltage between the A line and the B line (hereinafter referred to as the A-B voltage) sent to the D 131 and digitized is recorded in the measured value recording area 154 (Step Sl in FIG. 4).

The MPU 152 sends a selector control signal to the signal distribution unit (hereinafter referred to as SD) 14 (step S2), and the selector 13
0 selects the A line measurement circuit (hereinafter referred to as AGM) 17, and the voltage between the A line and the earth (hereinafter referred to as A
-G voltage) is sent to the A10131, and the digitized measurement value is recorded in the recording area 154 (step S3). Next, a selector control signal is sent to the SD'14 (step S4), the selector 130 selects the B line ground measurement circuit (hereinafter referred to as BGM) 1B, and the voltage between the B gland and the ground air measured by BCMIB (hereinafter referred to as BGM) is selected by the selector 130. -G voltage)
is sent to the A/D 131, and the digitized measurement value is recorded in the measurement recording area 154 (step 35).
.

The MPU 152 first reads out the A-B voltage of the measured value from the measured value recording area 154 (step S6), and then reads out the voltage between line A and line B of the reference value table shown in FIG. ! Compare it with the lightning voltage 0V to determine whether the measured value is below the reference voltage (step S7), and if it is below, proceed to the next step and read the A-G voltage from the measured value recording area 154 (step S8).
), otherwise it is regarded as a failure and control is transferred to the failure recording program 157, and the current time and failure item (A-
B voltage) is recorded in the fault recording area 155 (step 550), and then control is returned to the measurement recording program 156.

Then, in the same way as above, set the A-G voltage to A in the reference value table 150.
It is compared with a reference voltage of 50V between the line and the earth to determine whether it is higher than the reference voltage (step S9), and if it is higher than that, it is considered normal and the process proceeds to the next step, where the B-G voltage is read from the measured value recording area 154. (Step 510) If not, it is regarded as a fault and the fault recording program 157 records the current time and fault item (A-G voltage) in the fault recording area 155 (Step 551).

The B-G voltage is also compared with the reference voltage of 100V between the B line and the earth in the reference value table 150, and it is determined whether it is above the reference value (step 511), and if it is not above, it is considered a fault and the fault recording program 157 The current time and fault item (
B-G voltage) is recorded in the fault recording area 155 (
Ste Nobu552).

After determining that the B-G voltage is equal to or higher than the reference value, or after completing the above fault recording, the MPU 152 instructs the 5D 14 to switch each measurement circuit, and switches each measurement circuit to resistance measurement (step 512). .

The MPU 152 sends a selector control signal to 5D14 (step 513), causes the selector 130 to select ABM16, and selects the resistance (
(hereinafter referred to as A-B resistance) is sent to the A/D 131, and the digitized measured value is recorded in the measured value recording area 154 (step 514). Next, a selector control signal is sent to 5D14 (step 515), the selector 130 selects AC, M17, and the resistance between the A line and the earth (hereinafter referred to as A-G resistance) measured by AC, M17 is set as A/G resistance. D1
31, and records the digitized measurement value in the measurement recording area 154 (step 816).

Furthermore, a selector control signal is sent to 5D14 (step 5
17), cause the selector 130 to select 80M18, and
The resistance between the B line and the ground air measured by M18 (hereinafter referred to as B-G resistance) is sent to the A/D 131, and the digitized measurement value is recorded in the measurement value recording area 154 (step 818). .

The MPU 152 records A recorded from the measurement value recording area 154.
- Read the B resistance step 519), compare Ω with the reference resistance value 20 between the A line and B line in the reference value table shown in FIG. 3, and determine whether the measured value is greater than or equal to the reference resistance value. Step 520), if this is the case, proceed to the next step and read the A-G resistance from the measured value recording area 154.Step 5
21), if it is not above, it will be considered as a disability and the disability will be recorded.

Control is transferred to system 157, and the current time and fault item (A2B
After recording the resistance) in the fault recording area 155 (step 553), control is returned to the measurement recording program 156.

Next, in the same way as above, set the A-G resistance to A in the reference value table 150.
The standard resistance value 20 between the cotton and the ground air is compared with Ω, and it is determined whether the resistance is greater than or equal to the reference resistance value (Step 522); if it is, it is considered normal and the process proceeds to the next step and records the measured value from the measurement value recording area 154. Step 523 of successively adding B-G resistors
), otherwise it is regarded as a failure and the current time and failure item (A-G resistance) are recorded in the failure recording area 155 by the failure recording program 157 (step 554).
. The B-G resistance is also compared with Ω to the reference resistance value 20 between the B line and the ground air in the reference value table 150, and it is determined whether it is greater than the reference resistance value (step 524), and if it is not greater than the reference resistance value, a fault is detected. The current time and fault item (B-G resistance) are recorded in the fault recording area 1 by the fault recording program 157.
55 (step 555).

When step S24 or step S55 is completed, M
The PU 152 starts the timing (step 325),
When the timing time previously set by the operation unit 158 comes, a timeout occurs (step 526), and it is determined whether the set fixed time monitoring time has ended (step 527), and if the monitoring time has not ended, the process returns to step S1. Go back and repeat the above operation, and when finished, stop the operation.

When a maintenance person gives a display command to the MP Ij 152 from the operation unit 158 in order to know the contents recorded in the failure recording area 155, an undisclosed input/output processing program displays the failure items and the contents recorded in the failure recording area 155. The time of occurrence is printed out from the display section 159.

The above embodiment is an example in which connection is made to one subscriber line for monitoring, but each of the measurement circuits described above is connected to a plurality of subscriber lines in sequence through a selector circuit that connects the plurality of lines in sequence. However, it can be easily realized that the time when the failure occurred and the failure item are recorded on the line side in the failure recording area, and even in that case, the effects of the present invention do not change. Further, the effect of the present invention remains the same even if the order of recording the measured values of each measuring circuit and the order of comparing each measured value with each reference value are arbitrarily changed.

〔Effect of the invention〕

As explained in detail above, by using the subscriber line monitoring device according to the present invention, various characteristic values of the subscriber line can be periodically measured within a certain period of time, and the time and item of failure can be automatically recorded. This eliminates the hassle and inefficiency of manually switching measurement items and long-term monitoring, and makes maintenance work easier and more efficient by capturing intermittent failures in subscriber lines. be.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the principle of the present invention, Fig. 2 is a block diagram of a subscriber line monitoring device according to an embodiment of the present invention, Fig. 3 is an explanatory diagram of a reference value table, and Fig. 4 is a measurement recording program and 3 is a flowchart of a failure recording program. In the figure, 1 is a subscriber line monitoring device, 2 is a subscriber line, 10 is a measurement unit, 13 is a digital conversion means, 14 is a signal distribution unit, 15 is a processing unit, 150 is a reference value table, and 151 is a measurement recording process. Show the means. Figure 1 is a block diagram of the principle of the present invention. Figure 3 is an explanatory diagram of the reference value table.

Claims (1)

[Scope of Claims] A measuring unit (10) that measures a plurality of types of characteristic values defined in the subscriber line (2), and a digital converter that digitizes the analog measurement values measured by the measuring unit (10). (13); a signal distribution unit (14) that sends a control signal that causes the measuring unit (10) to select the characteristic value to be measured; and a reference value table storing reference values corresponding to each of the measured values. (150) and each of the measured values digitized by the digital conversion means (13), and combines each recorded measured value with each of the reference values stored in the reference value table (150). It is characterized by comprising a processing unit (15) having a measurement recording processing means (151) for comparing the values and determining whether or not there is a failure, and in the case of a failure, recording the time of occurrence and the failure item. Subscriber line monitoring equipment.