KR102188731B1 - OPTIC FIBER LINE MONITORING SYSTEM and OPTICAL DISTRIBUTION FRAME DEVICE - Google Patents

Abstract

The present invention relates to an optical fiber line monitoring system having an optical fiber line monitoring function for checking an abnormality in an optical fiber line in use and an optical distribution frame device. According to the present invention, the optical distribute frame device comprises: an optical cable connection unit for connecting an end of an optical cable used as a communication network; an optical jumper cord for transmitting light between the optical cable connection unit and an external optical transmission device and including an optical signal level detector; and an optical fiber line monitoring terminal for determining whether the optical fiber is abnormal in a manner of comparing a level detected by the optical signal level detector with a reference level. The optical fiber line monitoring terminal comprises: an input unit for receiving information on the status of optical fibers belonging to the optical cable and information on the reference level; a measurement unit for receiving the detection signal of the optical signal level detection unit to check the corresponding optical signal level; an analysis unit for comparing the determined optical signal level with the reference level to determine whether the optical fiber is abnormal; and an output unit for outputting information on the determined abnormality of the optical fiber and information on the status of the optical fibers.

Description

Optical fiber line monitoring system and optical distribution box device {OPTIC FIBER LINE MONITORING SYSTEM and OPTICAL DISTRIBUTION FRAME DEVICE}

The present invention relates to an optical path monitoring system capable of grasping an abnormality in an optical path in use. More specifically, the present invention relates to an optical path monitoring system using an optical distribution frame (OFD) device for connecting an optical cable to a communication facility.

At the moment when the ultra-high speed of the subscriber access network and IPTV service started from the rapid spread of the Internet and the TPS and QPS services emerged as the biggest issues in the subscriber communication market, the infrastructure construction for FTTH is the most essential element of the subscriber transmission network. It is emerging as.

Not only the leading countries in the telecommunication infrastructure and service market represented by the IT powerhouse, but also in the latecoming countries where the telecommunication market is newly formed, there is a trend that the cases of establishing the initial transmission infrastructure with optical lines are increasing significantly. In addition, the level of communication quality requirements is greatly increasing due to the increase in real-time services such as IPTV and VoIP.

Due to this market environment, the importance of line and service quality is emerging as the biggest issue for service and subscriber network providers. And, in line service, the proportion of lines appears larger than that of equipment systems among maintenance factors. This is because the probability of system malfunction is greatly reduced due to the advancement of technology, while the occurrence rate of an abnormality in optical lines having characteristics of physical facilities is not significantly different from the past. Therefore, a continuous and systematic management function for the line is inevitably required.

Existing optical fiber facilities were managed by manual and operator's memory, so their efficiency was very low, and economically high cost was required. Therefore, it is very important to minimize damage by diagnosing/preventing the failure of the optical line in advance, identifying the point of failure, and recovering quickly. To this end, there is a need for an optical path monitoring method to improve the service quality, increase the efficiency of optical path operation and maintenance, reduce maintenance costs, and secure the reliability of the optical path through business computerization.

1 is a block diagram showing a structure in which a general optical cable and communication equipment are connected.

As shown, in order to connect an optical cable used as a communication network to a communication facility, an optical cable is usually connected to the OFD (Optical Distribution Frame) 10, and between the optical transmission device 50 and the optical distribution box 10. Connect using optical jumper cord. In the optical distribution box 50, several optical jumper cords are connected to the optical terminal device.

FIG. 2 is a conceptual diagram illustrating an optical path monitoring method according to the prior art in the optical cable and communication facility connection structure of FIG. 1.

As shown, the optical path inspection is performed using a separate manual measuring instrument (optical power meter, OTDR, etc.)50 for the optical core that is in operation in the optical distribution box (OFD). , Since the optical core in use is mostly monitored through the normal operation of the optical communication facility, it is difficult to check the optical path in real time when the optical transmission device is defective. That is, real-time monitoring of an inactive optical path is difficult, and in the case of an optical path in use, real-time monitoring is impossible when the optical transmission device 50 is defective.

On the other hand, in the management of optical core ship number, a tag is attached to the optical jumper code to be used in the optical distribution box (10, OFD), and the changed content is manually entered into the individual optical core status management form, and ICT Optical core status management is performed by inputting it into the network operation system. In other words, since the optical core status management is individually performed by hand, which is an offline method, it is difficult to manage the status in real time.

Republic of Korea Publication 10-2012-0090303

An object of the present invention is to provide an optical distribution box device having an optical path monitoring function capable of detecting an abnormality in an optical path in use.

An object of the present invention is to provide an optical path monitoring system having an optical path monitoring function capable of grasping an abnormality in an optical path in use.

An optical distribution box device according to an aspect of the present invention includes: an optical cable connection unit for connecting an end of an optical cable used as a communication network; An optical jumper cord that transmits light between the optical cable connection unit and an external optical transmission device and includes an optical signal level detector; And an optical path monitoring terminal that determines whether or not the optical fiber is abnormal by comparing a level detected by the optical signal level detector with a reference level.

Here, the optical path monitoring terminal includes: an input unit for receiving information on the status of optical fibers belonging to the optical cable and information on the reference level; A measuring unit receiving a detection signal from the optical signal level detecting unit and checking a corresponding optical signal level; An analysis unit that compares the determined optical signal level with the reference level to determine whether the optical fiber is abnormal; And an output unit that outputs information on whether the determined optical fiber is abnormal and information on the status of the optical fibers.

Here, the optical path monitoring terminal may further include a storage unit for storing information on the reference level and the accumulated optical signal level.

Here, the reference value may be adjusted using the accumulated optical signal level.

An optical path monitoring system according to another aspect of the present invention includes an optical cable made of a bundle of a plurality of optical fibers and used as a communication network; An optical transmission device for transmitting a signal carried on one of the optical cables to the outside; An optical distribution box device that transmits a signal loaded on an optical fiber constituting the optical cable via an optical jumper cord to the optical transmission device, and determines whether the optical fiber is abnormal by measuring an optical signal level of the optical jumper cord; And an optical path monitoring server that holds installation information of the optical cable and the optical distribution box device and monitors whether or not the optical cable is abnormal.

Here, the optical path monitoring server uses level variation information accumulated from a plurality of optical distribution box devices and installation information of the optical cable and optical distribution box device, and causes the variation of the optical signal detection level. Can be analyzed.

Here, the optical distribution box device comprises: an optical cable connecting portion connecting an end of the optical cable; An optical jumper cord that transmits light between the optical cable connection unit and the optical transmission device and includes an optical signal level detector; And an optical path monitoring terminal that determines whether or not the optical fiber is abnormal by comparing a level detected by the optical signal level detector with a reference level.

Here, the optical path monitoring terminal includes: an input unit for receiving information on the status of optical fibers belonging to the optical cable and information on the reference level; A measuring unit receiving a detection signal from the optical signal level detecting unit and checking a corresponding optical signal level; An analysis unit that compares the determined optical signal level with the reference level to determine whether the optical fiber is abnormal; An output unit that outputs information on whether the determined optical fiber is abnormal and information on the status of the optical fibers; And a storage unit for storing information on the reference level and the accumulated optical signal level.

Here, the optical distribution box apparatus includes: obtaining a reference value of a target optical fiber; Receiving a measured value of the optical intensity of the optical fiber; Comparing the reference value and the measured value; Determining as abnormal if the measured value is out of the range of the reference value; And outputting an alarm in response to the abnormality determination.

An optical path monitoring method according to another aspect of the present invention includes an optical cable made of a bundle of a plurality of optical fibers and used as a communication network; An optical transmission device for transmitting a signal carried on one of the optical cables to the outside; An optical cable connecting portion connecting an end of the optical cable; an optical jumper cord having an optical signal level detector for performing light transmission between the optical cable connecting portion and the optical transmission device; and a level detected by the optical signal level detector; An optical distribution box device including an optical path monitoring terminal that determines whether or not the optical fiber is abnormal by comparing a reference level; And an optical path monitoring server that holds installation information of the optical cable and optical distribution box device, and monitors whether or not the optical cable is abnormal, as an optical path monitoring method performed in the optical path monitoring terminal of the optical path monitoring system ,

Obtaining a reference value of the target optical fiber; Receiving a measured value of the optical intensity of the optical fiber; Comparing the reference value and the measured value; Determining as abnormal if the measured value is out of the range of the reference value; And outputting an alarm in response to the abnormality determination.

If the optical path monitoring system of the present invention according to the above-described configuration is implemented, there is an advantage that it is possible to monitor in real time an abnormality of the optical path in use that may occur due to an optical signal connection line abnormality such as damage to an optical cable connected to the optical transmission device .

The optical path monitoring system of the present invention has an advantage in that it is easy to identify a failure section of the optical path.

The optical path monitoring system of the present invention has an advantage of being able to establish a regular optical path monitoring and inspection system by transmitting an alarm signal when an optical path abnormality occurs.

The optical path monitoring system of the present invention has the advantage of being able to effectively manage the optical core status by updating the status of the optical core in operation in real time from a monitoring device installed inside an optical distribution box and a monitoring device server installed remotely. .

1 is a block diagram showing a structure in which a general optical cable and communication equipment are connected.
FIG. 2 is a conceptual diagram illustrating an optical path monitoring method according to the prior art in the optical cable and communication facility connection structure of FIG. 1.
FIG. 3 is a block diagram illustrating an optical path monitoring system for performing on-line monitoring of an optical path according to the idea of the present invention.
4 is a block diagram showing a signal transmission structure of an optical distribution box device and an optical cable according to an embodiment of the present invention.
5 is a block diagram illustrating an optical distribution box device according to an embodiment of the present invention.
6 is a flowchart illustrating an embodiment of a method for monitoring an optical path that can be performed in the optical path monitoring system of FIG. 3.

In describing the present invention, terms such as first and second may be used to describe various elements, but the elements may not be limited by terms. The terms are only for the purpose of distinguishing one component from other components. For example, without departing from the scope of the present invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

When a component is connected to or is referred to as being connected to another component, it can be understood that it may be directly connected or connected to the other component, but other components may exist in the middle. .

The terms used in the present specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions may include plural expressions unless the context clearly indicates otherwise.

In the present specification, terms such as include or include are intended to designate the existence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and one or more other features or numbers, It may be understood that the presence or addition of steps, operations, components, parts, or combinations thereof, does not preclude the possibility of preliminary exclusion.

In addition, shapes and sizes of elements in the drawings may be exaggerated for clearer explanation.

The present invention proposes a device capable of displaying an optical path level value for an optical jumper cord installed inside an optical distribution box (OFD), checking for an abnormality in an optical path, and automatically managing the status of an optical core ship number.

FIG. 3 is a block diagram illustrating an optical path monitoring system for performing on-line monitoring of an optical path according to the idea of the present invention.

4 is a block diagram showing a signal transmission structure of an optical distribution box device and an optical cable according to an embodiment of the present invention.

5 is a block diagram illustrating an optical distribution box device according to an embodiment of the present invention.

The illustrated optical path monitoring system includes an optical cable 2 made of a bundle of a plurality of optical fibers and used as a communication network; An optical transmission device 500 that is input from an optical cable connection part of the optical distribution box device and transmits a signal carried on one of the optical cables to the outside; The signal loaded on the optical fiber constituting the optical cable is transmitted to the optical transmission device 500 via the optical jumper cord 120, and the optical signal level of the optical jumper cord is measured to check whether the optical fiber is abnormal. A light distribution box device 100; And an optical path monitoring server 700 that holds the installation information of the optical cable 2 and the optical distribution box device 100 and monitors whether or not the optical cable 2 is abnormal.

The illustrated optical path monitoring server 700 may be installed remotely to manage the optical core status and optical signal reference values input from the optical distribution box device 100 (more specifically, the optical path monitoring terminal 160). Depending on the implementation, the optical path monitoring server 700 may display an optical signal level value measured by the optical path monitoring terminal 160 to an optical communication system operator (manager) using the optical cable 2. In addition, the optical signal abnormality notification signal generated from the optical path monitoring terminal 160 may be received and displayed as an alarm.

The illustrated optical distribution box apparatus 100 includes: an optical cable connecting portion 110 for connecting an end of an optical cable 2 used as a communication network; An optical jumper cord 120 that transmits light between the optical cable connection unit 110 and an external optical transmission device, and includes an optical signal level detector 170; And an optical path monitoring terminal 160 that determines whether the optical fiber is abnormal by comparing the level detected by the optical signal level detector 164 with a reference level.

The optical cable connection part 110 may have substantially the same structure as the conventional optical cable connection part shown in FIG. 1. As shown in the figure, in the optical cable connection part 110, an optical cable for communication 2 is connected to each optical fiber on one side thereof, and optical jumper cords 120 for the optical transmission device 500 are connected to each optical fiber on the other side. Connected.

The optical jumper code 120 is similar to that of the prior art except that the optical signal level detector 170 is mounted.

The optical signal level detector 170 may be various known optical signal level detection means. For example, it may be a device that extracts a part of the light flowing through the optical path of the optical jumper cord 120 by means of a diffraction phenomenon, a polarization phenomenon, a Brillian grating, or the like, and measures an optical signal intensity of the extracted partial light.

For example, a Y-shape mechanically diverges light flowing through the optical path of the optical jumper cord 120, and one of the branched paths forms a main path, and a device for measuring the intensity of an optical signal is connected to the other end. Can have.

For example, in the light extraction means using mechanical light extraction and physical phenomena, it is not preferable that some light leaks to the outside during operation of the optical communication system, and electrical/mechanical means (eg, liquid crystal, micromirror, etc.) It is advantageous to have a configuration capable of intercepting the light extraction.

The illustrated optical path monitoring system is installed inside the optical distribution box (OFD) device 100 to measure the level value of the optical jumper code 120 and to perform a real-time abnormality check of the optical path. And, the optical path monitoring according to the idea of the present invention is performed by the optical path monitoring server 700 that manages the remote monitoring and status of the optical path.

To this end, the optical path monitoring terminal 160 and the optical path monitoring server 700 may provide wired data communication (serial communication, parallel communication, USB communication, Ethernet communication, etc.) or wireless data communication (Bluetooth communication, short-range wireless communication, RF Communication, ZigBee communication, Wi-Fi communication, etc.), and communication modules for this may be provided. The communication module provided in the optical path monitoring terminal 160 may serve as an input unit to be described later.

The illustrated optical path monitoring terminal 160 includes: an input unit 162 for receiving information on the status of optical fibers belonging to the optical cable 2 and information on the reference level; A measuring unit 164 for receiving a detection signal from the optical signal level detecting unit 170 and determining a corresponding light level; An analysis unit 165 that compares the determined light level with the reference level to determine whether the optical fiber is abnormal; And an output unit 168 that outputs information on whether the determined optical fiber is abnormal and information on the status of the optical fibers.

As shown, the optical path monitoring terminal 160 inputs the current status of the optical core in use into the system, and an input unit 162 that can input the reference value of the optical signal into the system, and each optical jumper code in the optical distribution box. A measurement unit 164 capable of measuring the optical transmission/reception level of, and an analysis unit 165 capable of determining whether there is an abnormality by comparing the optical signal level value with a reference value, and the measured optical signal level value and the optical signal level value. It is composed of an output unit 168 that can display the presence or absence of an abnormality and the status of the use of the optical core, and performs a function of monitoring the optical signal of the optical jumper code in real time and managing the status of the use of the optical core.

Looking at the functions in more detail, the input unit 162 may input the current status of the optical core in use or the changed optical core from the optical path monitoring terminal 160 or the optical path monitoring server 700 installed remotely, and each optical core The star reference value may be input from the optical path monitoring terminal 160 or the optical path monitoring server 700 and reflected in real time.

In addition, the measurement unit 164 is connected to each optical jumper cord 120 in the optical distribution box 100 through an optical signal connection line, and measures the intensity level of the optical transmission/reception signal, and the optical path monitoring terminal 160 The optical signal level value can be transmitted to. The optical signal level value may be displayed by transmitting an optical signal value to the optical path monitoring terminal 160 and the optical path monitoring server 700.

In addition, the analysis unit 165 compares the optical signal value received through each optical signal connection line with the optical signal reference value, and when it is determined that the optical signal reception value is out of the reference value range, an optical path (optical fiber) abnormality notification signal Can be created. By transmitting the generated optical signal abnormality notification signal to the output unit 168, it is possible to control to display the abnormality through the output unit 168.

In addition, the output unit 168 may display the optical signal measurement value transmitted from the measurement unit 164 on the optical path monitoring terminal 160 and the remote monitoring server 700, and transmitted from the analysis unit 165 An alarm may be displayed on the optical path monitoring terminal 160 and the remote monitoring server 700 by receiving an optical signal abnormality notification signal.

Depending on the implementation, the output unit 168 may notify an operator (manager) of the optical communication system using the optical cable 2 of the result of the alarm occurrence by mail and/or SMS.

Depending on the implementation, the output unit 168 may display the optical core reference value and the optical core ship number input from the input unit 162 on the optical path monitoring terminal 160 and the remote monitoring server 700, and , The alarm generation history, the optical core reference value, and the optical core ship number status may be recorded in the management ledger (which may be formed in the storage unit 166 to be described later).

Depending on the implementation, the optical path monitoring terminal 160 may further include a storage unit 166 that stores the reference value and the accumulated measurement value. In addition. The storage unit 166 may store an alarm generation history, an optical core reference value, and a management ledger for recording the status of the optical core ship number.

Accumulating and storing the measured values (that is, the light level checked by the measuring unit) in the storage unit 166 can reduce the amount of data communication by transmitting the measured values for a predetermined period to the monitoring server 700 at a time. In addition, the reference value may be adjusted (tuned) based on the accumulated measured values. For example, in the case of monitoring only the cutting of the optical fiber, when the optical signal transmitted due to the aging of the optical fiber is weakened, the reference value is lowered based on the accumulated measurement values, thereby cutting the optical fiber due to aging. Can prevent judgment.

On the other hand, the optical fibers provided in the optical cable 2 are expected to have almost the same durability and aging degree, and the adjusted reference values for each optical fiber are averaged among those belonging to one optical cable. , This average value may be applied as a reference value for optical fibers belonging to the one optical cable.

Depending on the implementation, the accumulated measurement values stored in the storage unit 166 are transmitted to the optical path monitoring server 700 via the wired/wireless communication means described above, and long-term operation of the optical path monitoring server 700 It can be reflected in policy or used for measurement value analysis.

For example, the optical path monitoring server 700 uses level variation information accumulated from a plurality of optical distribution box devices and installation information of the optical cable 2 and the optical distribution box device 100, The cause of the fluctuation of the detection level of the optical signal can be analyzed.

For example, in the case of a plurality of optical distribution box devices provided at similar sites (places), of the same type, and with similar manufacturing times, the fluctuation of the detection signal due to the aging of the optical distribution box itself is compared with those of other optical distribution box devices, The effect of the aging of the optical distribution box itself can be analyzed.

For example, in the case of optical distribution box devices provided on a plurality of optical cables that are provided at similar sites (locations) and have the same type and have similar manufacturing times, the fluctuation of the detection signal due to the aging of the optical cable itself can be prevented by other optical distribution box devices. Compared to those, the effects of the aging of the optical cable itself can be analyzed.

6 is a flowchart illustrating an embodiment of a method for monitoring an optical path that can be performed in the optical path monitoring system of FIG. 3.

The illustrated optical path monitoring method includes the steps of obtaining a reference value of a target optical fiber (S10); Receiving a measured value of the optical intensity of the optical fiber (S20); Comparing the reference value and the measured value (S40); Determining an abnormality when the measured value is out of the range of the reference value (S60); And outputting an alarm in response to the abnormality determination (S80).

The reference value obtaining step (S10) is performed in a manner of transmitting a reference value for each optical fiber (core) from the monitoring server 700 to the input unit 162 of the monitoring terminal 160 through wired/wireless communication. I can.

Here, the reference value refers to a criterion for determining whether the measured value is sound with respect to the measured value of the optical intensity of the optical fiber, and may be a reference range consisting of an upper limit and a lower limit according to implementation.

In addition, in the case of a single mode optical fiber, the reference value may be one reference value (range) when light passes, and in the case of a multimode optical fiber, the reference value is a plurality of reference values (range) according to the number of units of light passing through. It can be a set.

The monitoring server 700 may assign (manage) a reference value to a plurality of managed optical cables. For optical fibers included in one optical cable, the same reference value may be assigned for each type.

Depending on the implementation, the monitoring server 700 and/or the monitoring terminal 160 may analyze measurement values accumulated over a predetermined period and adjust the initial reference value.

In the measurement value input step (S20), the measurement unit of the monitoring terminal 160 receives the optical intensity signal detected from the optical signal level detector 170 provided in the optical jumper code 120. To this end, the measurement unit 164 may include an AD converter for converting the analog output signal of the optical signal level detector 170 into a digital signal.

In the comparing step (S40), the analysis unit 165 of the monitoring terminal 160 may compare the measured value estimated when the light passes through and the reference value.

In the abnormality determination step (S60), the analysis unit 165 of the monitoring terminal 160 may check whether the measured value falls within the similar range of the reference value, and if it does not fall within the similar range, it may determine an optical fiber abnormality. .

In the alarm output step (S80), the output unit 168 of the monitoring terminal 160 may display an abnormality of the corresponding optical fiber in the optical distribution box, and display it on a display device (console monitor, etc.) of the monitoring server. . In addition, the monitoring server 700 and/or the output unit 168 may notify an optical communication system operator (manager) of an abnormality of the corresponding optical fiber by mail and/or SMS.

Those skilled in the art to which the present invention pertains, since the present invention may be implemented in other specific forms without changing the technical spirit or essential features thereof, the embodiments described above are illustrative in all respects and should be understood as non-limiting. Only. The scope of the present invention is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. .

2: optical cable 100: optical distribution box device
110: connection part 120: optical jumper cord
160: optical path monitoring terminal 170: optical signal level detector
500: optical transmission device 700: optical path monitoring server

Claims (10)

An optical cable connection unit for connecting an end of an optical cable used as a communication network;
An optical jumper cord that transmits light between the optical cable connection unit and an external optical transmission device and includes an optical signal level detector; And
The reference level is determined by comparing the level detected by the optical signal level detector with the reference level to determine whether there is an abnormality in the optical fiber. Optical fiber monitoring terminal
Optical distribution box device comprising a.
The method of claim 1,
The optical path monitoring terminal,
An input unit for receiving information on the status of optical fibers belonging to the optical cable and information on the reference level;
A measuring unit that receives the detection signal from the optical signal level detector and checks a corresponding optical signal level;
An analysis unit that compares the identified optical signal level with the reference level to determine whether the optical fiber is abnormal; And
An output unit that outputs information on whether the determined optical fiber is abnormal and information on the status of the optical fibers
Optical distribution box device comprising a.
The method of claim 2,
The optical path monitoring terminal,
A storage unit for storing information on the reference level and the accumulated optical signal level
The optical distribution box device further comprising a.
delete An optical cable made of a bundle of a plurality of optical fibers and used as a communication network;
An optical transmission device for transmitting a signal carried on one of the optical cables to the outside;
An optical distribution box device that transmits a signal loaded on an optical fiber constituting the optical cable via an optical jumper cord to the optical transmission device, and determines whether the optical fiber is abnormal by measuring an optical signal level of the optical jumper cord; And
An optical path monitoring server that holds installation information of the optical cable and optical distribution box device, and monitors the abnormality of the optical cable
Including,
The optical distribution box device,
An optical cable connecting portion connecting an end of the optical cable;
An optical jumper cord that transmits light between the optical cable connection unit and the optical transmission device and includes an optical signal level detector; And
It is determined whether the optical fiber is abnormal by comparing the level detected by the optical signal level detector with the reference level, but when the optical signal transmitted is weakened due to the aging of the optical fiber, the reference is based on the accumulated measurement values Fiber optic monitoring terminal to lower the level
Optical fiber monitoring system comprising a.
The method of claim 5,
The optical path monitoring server,
An optical path monitoring system for analyzing a cause of a variation in an optical signal detection level using level variation information accumulated from a plurality of optical distribution box devices and installation information of the optical cable and optical distribution box device.
The method of claim 5
The optical distribution box device,
An optical cable connecting portion connecting an end of the optical cable;
An optical jumper cord that transmits light between the optical cable connection unit and the optical transmission device and includes an optical signal level detector; And
An optical path monitoring terminal that determines whether the optical fiber is abnormal by comparing the level detected by the optical signal level detector with a reference level
Optical fiber monitoring system comprising a.
According to claim 7
The optical path monitoring terminal,
An input unit for receiving information on the status of optical fibers belonging to the optical cable and information on the reference level;
A measuring unit that receives the detection signal from the optical signal level detector and checks a corresponding optical signal level;
An analysis unit that compares the determined optical signal level with the reference level to determine whether the optical fiber is abnormal;
An output unit that outputs information on whether the determined optical fiber is abnormal and information on the status of the optical fibers; And
A storage unit for storing information on the reference level and the accumulated optical signal level
Optical fiber monitoring system comprising a.
The method of claim 5,
The optical distribution box device,
Obtaining a reference value of the optical fiber;
Receiving a measured value of the light intensity of the optical fiber;
Comparing the reference value and the measured value;
Determining as abnormal if the measured value is out of the range of the reference value; And
Outputting an alarm for the abnormality determination
An optical path monitoring system for performing an optical path monitoring method comprising a.

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