KR102532924B1 - Method for controlling optical cable measuring instrument - Google Patents

Abstract

The present invention relates to a method for controlling an optical cable meter that can easily measure even irregular and intermittent faults in addition to permanent fault and power level measurement in measuring a fault occurrence point or power level using an optical cable meter.
The optical cable meter control method of the present invention includes the steps of (a) periodically receiving real-time measurement values of OTDR (Optical Time Domain Reflectometer) or LFT (Live Fault Test) measurement points; Step (b) of determining whether the currently input measured value has renewed the previous maximum or minimum value, and if the currently input measured value has renewed the previous maximum or minimum value, the updated maximum or minimum value is stored and the updated maximum or minimum value It is made including the step (c) of displaying in the form of a graph and text.
In the configuration described above, the measurement point is determined manually by a tester or automatically by the measuring instrument itself, or is determined as an entire measurement section.
The currently input measurement value is summed with previously input measurement values to calculate the average value, and then displayed in the form of a graph or text. If the currently input measurement value deviates from the standard value, it is notified to the tester's terminal along with an audible and visual alarm.

Description

Method for controlling optical cable measuring instrument {Method for controlling optical cable measuring instrument}

The present invention relates to a method for controlling an optical cable meter, and in particular, in measuring a failure point or power level using an optical cable meter, in addition to measuring regular failures and power levels, even irregular and intermittent failures can be easily measured It relates to a method for controlling an optical cable meter.

With the development of optical communication technology, communication technology using optical cables is widely used throughout the industry. The length of optical cables used in optical communication is very long, ranging from several kilometers to hundreds of kilometers per section.

In the field where optical communication technology is used, continuous maintenance and management of optical cable facilities are required because it is important to newly install optical cables and to maintain already installed optical cables in the best condition.

Currently, an optical cable measuring device (Optical Time Domain Reflectometer; OTDR) is widely used to measure the presence or absence of an optical cable. According to this optical cable measuring device, for example, 5 ns to 10 μs of light pulses are incident on an optical cable, and then the intensity of the optical signal that is scattered backward is measured in the time domain to measure the characteristics of the optical cable, contact loss, and loss occurrence point. and chromatic dispersion, etc., and find the point of failure.

At this time, the incident light is not affected at all by external environmental factors such as simple shaking or surrounding electromagnetic fields, except when there is an abnormality such as cutting or bending due to the nature of the optical cable. Therefore, if the state of the optical cable is monitored using the optical cable measuring instrument, abnormalities on the optical cable such as cutting or bending of the optical cable can be measured.

On the other hand, in the case of an optical cable meter with an optical power meter function, it can measure the transmission/reception level of optical signal power such as optical cables, optical transmission devices, and various light sources. is taken as

However, according to the conventional optical cable measuring device, since the measurement method is made only of visual representation of real-time measurement values, it is possible to accurately measure abnormal points in static optical cables with an accuracy of around several tens of centimeters, while irregularly In the case of repetitive failures, it is difficult to detect them.

Prior Art 1: 10-2009-100109 Patent Publication (Title of Invention: Device for monitoring optical cable of optical subscriber network using optical pulse type and its method)

Prior Art 2: Publication No. 10-2005-119015 (Title of Invention: Real-time Optical Cable Monitoring System)

Prior Art 3: Publication of Patent Publication No. 10-2005-96553 (Title of Invention: Optical Line Monitoring Method of Wavelength Division Multiplexing Optical Network)

The present invention has been devised to solve the above problems, and in measuring the point of failure or the power level using an optical cable meter, it can easily measure even irregular and intermittent failures in addition to measuring permanent failures and power levels. It is an object of the present invention to provide a method for controlling an optical cable measuring device.

Optical cable meter control method of the present invention for achieving the above object is a step (a) of periodically receiving real-time measurements of OTDR (Optical Time Domain Reflectometer) or LFT (Live Fault Test) measurement points; Step (b) of determining whether the currently input measured value has renewed the previous maximum or minimum value, and if the currently input measured value has renewed the previous maximum or minimum value, the updated maximum or minimum value is stored and the updated maximum or minimum value It is made including the step (c) of displaying in the form of a graph and text.

In the configuration described above, the measurement point is determined manually by a tester or automatically by the measuring instrument itself, or is determined as an entire measurement section.

The currently input measurement value is summed with previously input measurement values to calculate the average value, and then displayed in the form of a graph or text.

If the currently input measurement value deviates from the standard value, it is notified to the tester's terminal along with an audible and visual alarm.

An optical cable meter control method according to another feature of the present invention includes the step (h) of periodically receiving a real-time measurement value of an OPM (Optical Power Meter) test; (i) step of determining whether the currently input measured value has renewed the previous maximum or minimum value, and if the currently input measured value has renewed the previous maximum or minimum value, the updated maximum or minimum value is stored and the updated maximum or minimum value It is made including the step (j) of displaying in the form of text.

In the configuration described above, a currently input measurement value is summed with previously input measurement values to calculate an average value, and then displayed in the form of text.

If the currently input measurement value deviates from the standard value, it is notified to the tester's terminal along with an audible and visual alarm.

According to the optical cable meter control method of the present invention, in measuring the point of failure of an optical cable newly installed or in service operation, the change in real-time measured value according to the accumulation of measurement time is measured, whereas the existing measurement method is made of a visual representation of the real-time measured value. It helps to easily detect irregularly occurring failures of optical cables by visually expressing the maximum, minimum and average values at the same time.

As a result, according to the optical cable measuring device control method of the present invention, it is possible to detect irregularly occurring aging and progressive failures of optical cables or related facilities even without constant monitoring by the measuring personnel, thereby maximizing work efficiency and finding temporary inspections. It has the effect of improving the detection of difficult, irregularly occurring disorders.

1 is a block diagram of an optical cable measuring device to which the method of the present invention is applied.
2 is a flowchart illustrating a method for controlling an optical cable meter according to an embodiment of the present invention.
3 is an exemplary view of a display screen according to the control method of FIG. 2;
4 is a flowchart illustrating a method for controlling an optical cable meter according to another embodiment of the present invention.
5 is an exemplary view of a display screen according to the control method of FIG. 4;

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the optical cable measuring device control method of the present invention will be described in detail.

1 is a block diagram of an optical cable measuring device to which the method of the present invention is applied. As shown in FIG. 1, the optical cable meter to which the method of the present invention can be applied is a plurality of boards that perform unique functions, for example, low density wavelength division multiplexing (CWDM) or high density wavelength division multiplexing ( CWDM board 100 that performs Dense Wavelength Division Multiplexing (DWDM) processing, OTDR (Optical Time Domain) that measures the intensity of the optical signal that is scattered backward after incident light pulses of 5 ns to 10 μs in the time domain Reflectometer) test or LFT (Live Fault Test) OTDR board (300), OPM (Optical Power Meter) board (200) and each board that measures the transmission and reception level of optical signal power such as optical cables, optical transmission devices, and various light sources An integrated control board (400) that performs functions such as setting various parameters to be processed in (100), (200) and (300) and displaying the results processed in each board (100), (200) and (300). ) may be integrated into one.

2 is a flowchart for explaining a method for controlling an optical cable meter according to an embodiment of the present invention, which can be performed by the CPU module of the integrated control board 400.

In the embodiment of FIG. 2, a control method for OTDR or LFT measurement is described. First, in step S100, a tester sets a measurement distance, a measurement wavelength, and various parameters, and in step S110, real-time measurement starts.

After the real-time measurement is started, a reference value for a measurement point and an alarm is set in step S120. The measurement point is set by marking the point the tester wants to measure, that is, the distance from the optical cable measuring device while looking at the display screen, or a failure occurs in the measuring device itself. It can be set automatically by estimating a point, for example, by checking a point where the power level suddenly changes.

Based on the measurement value at the time of marking the standard value, the tester can manually set the upper or lower limit value or automatically set the upper or lower limit value set as the default value.

Next, in step S130, the measurement result is displayed while the initial measurement value is stored. According to the prior art, the measured distance vs. power level graph only changes in real time over time, so that irregularly generated optical cables or related facilities In order to detect deterioration, progressive disability, etc., constant monitoring by measuring personnel was required.

Returning to FIG. 2 again, in step S140, it is determined whether the next measured value is input. If not, step S140 is repeatedly performed, but if it is input, it proceeds to step S150 and the currently input measured value is the previous maximum value (Max) or minimum value. (Min) is determined. Here, at the time of the first measurement, the current measurement value and the average value, the maximum value, and the minimum value will all be the same.

As a result of the determination in step S150, if the current measurement value has renewed the previous maximum value or minimum value, the process proceeds to step S160 to store the updated maximum value or minimum value. The average value (Avg) is calculated by summing with the previous measurements.

Next, in step S180, the updated or calculated maximum value, minimum value, and average value are displayed. FIG. 3 is an exemplary view of a display screen according to the control method of FIG. 2 . As shown in FIG. 3, according to the optical cable meter control method of the present invention, a graph in which the horizontal axis is the distance (km) and the vertical axis is the power level (dB) is displayed. It becomes the measuring point automatically set by

As shown in FIG. 3, according to the control method of the present invention, the fluctuation of the real-time measurement value according to the accumulation of measurement time centered on the marker, that is, the measurement point, is simultaneously set to the maximum value (Max), minimum value (Min), and average value (Avg). It can help to easily detect irregularly occurring failures of optical cables by displaying them visually as well as numerically.

As a result, according to the optical cable measuring device control method of the present invention, it is possible to detect irregularly occurring aging and progressive failures of optical cables or related facilities even without constant monitoring by the measuring personnel, thereby maximizing work efficiency and finding temporary inspections. It has the effect of improving the detection of difficult, irregularly occurring disorders.

Returning to FIG. 2 again, in step S130, it is determined whether the current real-time measured value deviated from the reference value, that is, the upper limit value or the lower limit value. If not, the process proceeds directly to step S210. The departure fact can be audibly and visually alarmed, for example, by blinking LEDs or generating an alarm sound, and furthermore, the tester's portable terminal can be notified of this fact through a text message or the like.

Finally, in step S210, it is determined whether the measurement is completed. If not, the process returns to step S140, whereas if it is completed, the program ends.

4 is a flowchart illustrating a method for controlling an optical cable meter according to another embodiment of the present invention, which may be performed by a CPU module of an integrated control board. The embodiment of FIG. 4 describes a control method for OPM measurement. First, a measurement wavelength and various parameters are set by a tester in step S300, and real-time measurement starts in step S310.

After the real-time measurement starts, a reference value for an alarm is set in step S320, and the tester can manually set an upper or lower limit value based on the initial measurement value, or automatically set an upper or lower limit value set as a default value.

Next, in step S330, the measurement result is displayed while the initial measurement value is stored. According to the prior art, only the power level that changes in real time over time is displayed as a number together with the measured wavelength, resulting in irregular occurrence. In order to discover aging and progressive failures of optical cables or related facilities, constant monitoring by measurement personnel was required.

Returning to FIG. 4 again, in step S340, it is determined whether the next measurement value has been input. If not, the process returns to step S340, whereas if it has been input, it proceeds to step S350 and the currently input measurement value is the previous maximum value (Max) or minimum value ( Min) is determined. Here, at the time of the first measurement, the current measurement value and the average value, the maximum value, and the minimum value will all be the same.

As a result of the determination in step S350, if the current measurement value has renewed the previous maximum value or minimum value, the updated maximum value or minimum value in step S360 is stored. Calculate the average value (Avg) by summing with .

Next, in step S380, the updated or calculated maximum value, minimum value, and average value are displayed. FIG. 5 is an exemplary view of a display screen according to the control method of FIG. 4 . As shown in FIG. 5, according to the optical cable meter control method of the present invention, the power level (dB) that changes in real time and the measured wavelength are displayed in numbers, and the minimum, maximum and reference values are displayed in numbers, resulting in irregular occurrence. It can help to easily detect the failure of the optical cable.

As a result, according to the optical cable measuring device control method of the present invention, it is possible to detect irregularly occurring aging and progressive failures of optical cables or related facilities even without constant monitoring by the measuring personnel, thereby maximizing work efficiency and finding temporary inspections. It has the effect of improving the detection of difficult, irregularly occurring disorders.

Returning to FIG. 4 again, in step S390, it is determined whether the current real-time measurement value deviated from the reference value, that is, the upper limit value or the lower limit value. If not, the process proceeds directly to step S410. An audible and visual alarm of the fact of departure, for example, blinking of an LED or generating an alarm sound, can be further notified to the tester's portable terminal through a text message or the like.

Finally, in step S410, it is determined whether the measurement is completed. If not, the process returns to step S340, whereas if it is completed, the program ends.

In the above, the preferred embodiment of the optical cable meter control method of the present invention has been described in detail with reference to the accompanying drawings, but this is only an example, and various modifications and changes will be possible within the scope of the technical idea of the present invention. Therefore, the scope of the present invention will be determined by the description of the claims below.

For example, in the embodiment of FIG. 2, the minimum and maximum values according to changes in real-time measured values at measurement points manually or automatically set by a tester are displayed. may be transformed into displaying

100: Coarse Wavelength Division Multiplexing (CWDM) board,
200: OPM (Optical Power Meter) board,
300: OTDR (Optical Time Domain Reflectometer) board,
400: integrated control board

Claims (7)

(a) receiving a real-time measurement value of an OTDR (Optical Time Domain Reflectometer) or LFT (Live Fault Test) measurement point periodically;
(b) determining whether the currently input measured value has renewed the previous maximum value or minimum value; and
(c) displaying the updated maximum or minimum value in the form of a graph and text while storing the updated maximum or minimum value when the currently input measured value renews the previous maximum or minimum value; and
A method for controlling an optical cable measuring device comprising the step of audibly and visually alarming and notifying a tester's terminal when a currently input measured value deviates from a reference value. The method of claim 1,
The measuring point is manually determined by the tester or automatically determined by the measuring device itself, or is an optical cable measuring device control method, characterized in that the entire measuring section. The method of claim 2,
An optical cable meter control method characterized in that the currently input measurement value is summed with previously input measurement values to calculate an average value and then displayed in the form of a graph and text. delete (h) receiving a real-time measurement value of OPM (Optical Power Meter) test periodically;
(i) step of determining whether the currently input measured value has renewed the previous maximum value or minimum value; and
(j) displaying the updated maximum or minimum value in the form of text while storing the updated maximum or minimum value when the currently input measured value renews the previous maximum or minimum value; and
A method for controlling an optical cable measuring device comprising the step of audibly and visually alarming and notifying a tester's terminal when a currently input measured value deviates from a reference value. The method of claim 5,
An optical cable meter control method characterized in that the currently input measurement value is summed with previously input measurement values to calculate an average value and then displayed in the form of text. delete

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