KR20220039312A - Method for diagnosing fault of optical splitter in passive optical network and apparatus thereof - Google Patents

Abstract

The present invention relates to an optical splitter failure diagnosing method in a passive optical subscriber network structure which comprises the following steps of: checking a line of a subscriber and connecting to an optical line termination device (OLT) connected to the line of the subscriber when receiving a failure report of the subscriber; collecting line-related information of the subscriber and line-related information of other subscribers sharing the line of the subscriber and an optical splitter (RN) from the optical line termination device (OLT); predicting optical level quality information of the line of the subscriber and lines of other subscriber based on the collected line-related information; and diagnosing whether the optical splitter (RN) has a failure by using the predicted optical level quality information.

Description

Method for diagnosing optical splitter failure and apparatus therefor

The present invention relates to a method and apparatus for diagnosing a failure of an optical splitter, and more particularly, to a method and apparatus for diagnosing a failure of an optical splitter installed in a PON-type optical subscriber network remotely.

With the development of optical communication technology and the rapid increase in demand for Internet services, research and commercialization of optical subscriber networks have been carried out since the early 2000s. Recently, in order to cope with the explosive increase in traffic due to the proliferation of mobile terminals such as smartphones and the increase in demand for IPTV, the demand for next-generation, energy-saving, high-speed, high-capacity optical subscriber network technology is increasing.

1 is a diagram showing types of general optical subscriber networks. As shown in FIG. 1 , the optical subscriber network can be divided into an Active Optical Network (AON) method and a Passive Optical Network (PON) method. The biggest difference between the AON method and the PON method is whether or not a separate power source is required to branch the optical signal.

The AON method uses expensive equipment such as Ethernet switches or routers to branch optical signals, which increases the cost of constructing and operating an optical subscriber network. On the other hand, the PON method can provide high bandwidth to subscribers, and since the OSP (Outside Plant) consists only of passive elements, it is possible to significantly reduce network operation costs. Therefore, telecommunication operators mainly use the PON method to build an optical subscriber network.

2 is a diagram showing the structure of an optical subscriber network of a general PON method. As shown in FIG. 2, the PON-type optical subscriber network (or passive optical subscriber network, 10) includes an optical line termination device (Optical Line Termination, OLT, 11), an optical splitter (12) and a plurality of optical networks. Includes subscriber equipment (Optical Network Terminal, ONT, 13).

The PON technology is a point-to-multipoint-based optical subscriber technology that uses a passive optical splitter that does not require power supply. The PON technology is largely classified into two types according to the difference in multiplexing and multiple access schemes. The first is time division multiplexing (TDM)-PON, and the second is wavelength division multiplexing (WDM) based wavelength division multiplexing (WDM). )-PON. Here, TDM-PON includes Broadband PON (B-PON) standardized by ITU-T, Gigabit-capable PON (G-PON), and Ethernet PON (E-PON) standardized by IEEE.

The optical splitter 12 used in the PON-type optical subscriber network may be referred to as a remote node (RN), and it is possible to reduce the terminal line cost by increasing the number of subscribers per line through line branching of 1:N. It has the advantage of being able to However, since RN itself is a passive element, there is no way to directly control the device. Due to this structural limitation, when a failure occurs in the subscriber line, there is a problem that the failure of the RN cannot be checked remotely.

When a failure occurs in the existing subscriber line, the items to be checked remotely are to check the operation status of the subscriber station, and to check the optical level value collected from the OLT when the ONT of the subscriber line is alive. In this case, there is nothing that can be done remotely, so an on-site dispatch is carried out. If the light level of the subscriber line is not good, all connection points in the home network from the subscriber terminal must be checked. However, in the case of an RN problem, not a problem on the home network, it is an ineffective action and leads to a waste of time.

There are two main reasons for when a service is unavailable due to a failure in the subscriber line in the optical subscriber network. The first cause may be a failure occurring in the RN itself, and the second cause may be a failure occurring in the subscriber line section at the bottom of the RN. Among them, if the RN itself fails, the service is not restored no matter what action is taken in the subscriber line section. Accordingly, there is a problem in that it takes a lot of time to repair the failure because the problem has to be solved while finding the cause of the failure one by one in a bottom-up method. This time requirement increases the customer service disconnection time, increases the operator's troubleshooting time, and reduces the efficiency of troubleshooting.

SUMMARY OF THE INVENTION The present invention aims to solve the above and other problems. Another object of the present invention is to provide a method and apparatus for diagnosing a failure of an optical splitter remotely using line-related information obtained from an optical fiber termination device (OLT) when a failure report is received.

According to an aspect of the present invention in order to achieve the above or other objects, the failure reception unit for receiving a failure report requested from a subscriber, and confirming the line of the subscriber; a line information collecting unit that collects line related information of the subscriber and line related information of other subscribers who share the subscriber line and an optical splitter (RN) from an optical fiber termination device (OLT); a line analyzer for predicting optical level quality information of a subscriber line and other subscriber lines based on the collected line-related information; and a failure diagnosis unit for diagnosing whether the optical splitter (RN) is faulty by using the predicted optical level quality information.

According to another aspect of the present invention, upon receipt of a failure report of a subscriber, the method comprising: checking the subscriber's line and connecting to an optical fiber termination device (OLT) connected to the subscriber's line; collecting the line-related information of the subscriber and line-related information of other subscribers sharing the subscriber line and an optical splitter (RN) from the optical fiber termination device (OLT); predicting optical level quality information of a subscriber line and other subscriber lines based on the collected line-related information; and diagnosing whether the optical splitter (RN) is faulty by using the predicted optical level quality information.

According to another aspect of the present invention, upon receipt of a failure report of a subscriber, the process of checking the subscriber's line and connecting to an optical fiber termination device (OLT) connected to the subscriber line; collecting the subscriber line-related information and line-related information of other subscribers sharing the subscriber line and an optical splitter (RN) from the optical fiber termination device (OLT); predicting optical level quality information of a subscriber line and other subscriber lines based on the collected line-related information; and a computer program stored in a computer-readable recording medium so that the process of diagnosing whether the optical splitter (RN) is faulty using the predicted light level quality information can be executed on a computer.

An RN failure diagnosis method and effects of the apparatus according to embodiments of the present invention will be described as follows.

According to at least one of the embodiments of the present invention, when a failure report is received, there is an advantage that the failure of the optical splitter (RN) can be remotely diagnosed using the line-related information obtained from the optical fiber termination device (OLT). .

In addition, according to at least one of the embodiments of the present invention, it is possible to minimize customer service interruption time due to failure by analyzing in real time whether the subscriber line and the optical splitter are faulty and guiding the physical location that requires action when the field is dispatched. , it has the advantage of shortening the work time of on-site engineers.

However, the effects that can be achieved by the RN failure diagnosis method and the apparatus according to the embodiments of the present invention are not limited to those mentioned above, and other effects not mentioned are from the following description in the technical field to which the present invention belongs It will be clearly understood by those of ordinary skill in the art.

1 is a view showing types of general optical subscriber networks;
2 is a view showing the structure of an optical subscriber network of a general PON method;
3 is a diagram showing the configuration of a PON system according to an embodiment of the present invention;
4 is a block diagram showing the configuration of a circuit failure diagnosis apparatus according to an embodiment of the present invention;
5 is a flowchart illustrating a new line opening procedure related to the present invention;
6 is a flowchart illustrating a line failure diagnosis method according to an embodiment of the present invention;
7 to 9 are diagrams referenced to explain a method for diagnosing whether an optical splitter installed in a PON-type optical subscriber network is faulty;
10 is a block diagram of a computing device according to an embodiment of the present invention;

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numbers regardless of reference numerals, and redundant description thereof will be omitted. The suffixes "module" and "part" for components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have distinct meanings or roles by themselves. That is, the term 'unit' used in the present invention means a hardware component such as software, FPGA, or ASIC, and 'unit' performs certain roles. However, 'part' is not limited to software or hardware. The 'unit' may be configured to reside on an addressable storage medium or it may be configured to refresh one or more processors. Thus, as an example, 'part' refers to components such as software components, object-oriented software components, class components and task components, processes, functions, properties, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays and variables. Functions provided within components and 'units' may be combined into a smaller number of components and 'units' or further divided into additional components and 'units'.

In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical idea disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention , should be understood to include equivalents or substitutes.

The present invention proposes a method and apparatus for remotely diagnosing whether an optical splitter is faulty by using line-related information obtained from an optical fiber termination device (OLT) when a service subscriber receives a failure report.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the drawings.

3 is a diagram showing the configuration of a PON system according to an embodiment of the present invention.

Referring to FIG. 3 , the PON system 100 according to an embodiment of the present invention includes an optical fiber termination device 110 , a plurality of optical splitters 120 , a plurality of optical subscriber devices 130 and a line failure diagnosis device ( 140).

The Optical Line Terminal (OLT, 110) connects the backbone network and the subscriber network to each other and terminates the optical signal. The optical fiber terminating device 110 may be located in the national office, but is not necessarily limited thereto.

The optical fiber termination device (OLT, 110) may include a plurality of PON subscriber units (115). Each PON subscriber unit 115 may provide a PON subscriber interface, and may perform a one-to-many (1:N) connection with the optical subscriber device 130 as a downlink device. To this end, the PON subscriber unit 115 is connected to the optical splitter 120 , and the optical splitter 120 is connected to a plurality of optical subscriber devices 130 .

The optical splitter (or remote node, 120 ) receives an optical signal from the optical path termination device (OLT, 110 ), branches the received optical signal, and transmits the received optical signal to the plurality of optical subscriber devices ( 130 ). The optical splitter 120 may increase the number of subscribers per line by branching one line to one-to-many (1:N).

The optical distributor 120 may be located in a main distribution frame (MDF) or a communication box (BBx, ex. BBC: Broad Cast Cabinet, BBS: Broad Cast Shelter, BBH: Broad Cast House).

The optical subscriber device 130 is installed in the house, and is a device that uses a communication network service through an optical signal received from the optical path termination device (OLT, 110) through the optical splitter 120. The optical subscriber device 130 may be referred to as an optical network terminal (ONT) or an optical network unit (ONU).

The line failure diagnosis device 140 is connected to the optical path termination device 110 and serves to remotely diagnose whether the PON system 100 is faulty. For example, the line failure diagnosis device 140 diagnoses the failure of the optical fiber terminating device 110, the failure of the optical splitter 120, the failure of the optical subscriber device 130, and the failure of the subscriber line. can do.

In the present embodiment, the line failure diagnosis device 140 may remotely diagnose whether the optical splitter 120 is faulty by using the line-related information obtained from the optical line termination device (OLT, 110). At this time, the line failure diagnosis device 140 may be located in the office, but is not necessarily limited thereto.

4 is a block diagram showing the configuration of a circuit failure diagnosis apparatus according to an embodiment of the present invention.

Referring to FIG. 4 , the line failure diagnosis apparatus 200 according to an embodiment of the present invention includes a failure reception unit 210 , a line information collection unit 220 , a line analysis unit 230 , and a failure diagnosis unit 240 . include The components shown in FIG. 4 are not essential for implementing the circuit failure diagnosis apparatus, so the circuit failure diagnosis apparatus described in this specification may have more or fewer components than those listed above.

The failure reception unit 210 may perform a function of receiving a failure report requested from a service subscriber. In this case, the failure report may be applied for online or offline.

The failure reception unit 210 may perform a function of confirming the optical subscriber device 130 and the failure line of the service subscriber when the failure report is received. In this case, the failure reception unit 210 may check the corresponding information based on the customer information of the subscriber registered in the service providing server.

The failure reception unit 210 may store information related to a failure report received from a corresponding service subscriber in a memory (not shown). This is to keep the service subscriber's failure report history.

The line information collection unit 220 accesses the optical fiber termination device (OLT, 110) and receives line-related information from the device (OLT, 110), that is, the line-related information of the subscriber who reported the failure, and the subscriber and the optical splitter (RN). , 120) can perform a function of collecting line-related information of other subscribers sharing the same.

The line-related information collected from the optical fiber terminating device (OLT, 110) includes the transmission power information of the optical fiber terminating device (OLT, 110), the distance between the optical fiber terminating device (OLT, 110) and the optical subscriber device (ONT, 130). Information and received signal strength indication (RSSI) information of the optical subscriber device ONT 130 may be included. Here, the distance information and RSSI information may be calculated by measuring light reflected from the device 130 after irradiating light from the optical path termination device OLT 110 to the optical subscriber device ONT 130 .

The circuit analysis unit 230 may analyze the optical level quality of the subscriber line reported to be faulty and the optical level quality of other subscriber lines sharing the subscriber line and the optical splitter RN 120 .

That is, the line analysis unit 230 uses the transmission power information and distance information obtained from the optical fiber termination device (OLT, 110), and the optical loss information stored in the memory, the optical level quality of the subscriber line reported to be faulty (that is, RSSI value) can be predicted. Here, the optical loss information is loss information occurring in the PON-type optical subscriber network structure, and may include cable loss, connector loss, connection loss, insertion loss, and the like.

The line analysis unit 230 uses the transmission power information and distance information obtained from the optical fiber termination device (OLT, 110) and the optical loss information stored in the memory to the optical level of other subscriber lines sharing the optical splitter 120. Quality (ie, RSSI value) can be predicted.

The circuit analyzer 230 may store optical level quality information of the subscriber line and other subscriber lines in the memory. The light level quality information stored in the memory may be used to remotely diagnose whether the light splitter is faulty.

The failure diagnosis unit 240 may diagnose whether the corresponding optical splitter RN, 120 has a failure based on the optical level quality information of the subscriber line sharing the optical splitter RN and 120 and optical level quality information of other subscriber lines.

More specifically, the failure diagnosis unit 240 may compare the actual RSSI value of the subscriber line in which the failure has been reported and the predicted RSSI value with each other. As a result of the comparison, when the actual RSSI value and the predicted RSSI value of the subscriber line are equal to each other or are within a predetermined error range, the failure diagnosis unit 240 may determine that the state of the subscriber line in which the failure has been reported is normal. Meanwhile, as a result of the comparison, when the actual RSSI value and the predicted RSSI value of the subscriber line are out of a predetermined error range, the failure diagnosis unit 240 may determine that there is a failure in the subscriber line or the optical splitter 120 .

In this case, in order to distinguish a subscriber line failure from an optical splitter failure, the failure diagnosis unit 240 may compare the actual RSSI value and the predicted RSSI value of all other subscriber lines sharing the optical splitter 120 with each other. As a result of the comparison, when the actual RSSI value and the predicted RSSI value of the other subscriber lines are the same or are within a predetermined error range, the failure diagnosis unit 240 may determine that a failure has occurred in the subscriber line reporting the failure. Meanwhile, as a result of the comparison, when the actual RSSI value and the predicted RSSI value of the other subscriber lines are out of a predetermined error range, the failure diagnosis unit 240 may determine that a failure has occurred in the optical splitter 120 .

5 is a flowchart illustrating a new line opening procedure related to the present invention.

Referring to FIG. 5 , a user who wants to use a network service may apply for subscription to the corresponding service through on-line or off-line connection ( S510 ).

Upon completion of service subscription, the network service provider may send an installer to the service subscriber's address. The installer can find a line available in the terminal box installed in the premises of the service subscriber and assign it to the subscriber line. Thereafter, the installer may install the optical subscriber device ONT 130 for providing a network service in the house (S520).

Upon completion of the line opening, the optical line termination device (OLT, 110) may automatically recognize the optical subscriber device (ONT, 130) and register the line-related information of the service subscriber (S530). At this time, the line-related information includes information about the optical subscriber device (ONT, 130) installed in the house, information about the optical splitter 120, RT connected to the optical subscriber device (ONT, 130), and optical cable information, etc. can do.

Thereafter, the optical path termination device (OLT, 110) may transmit the optical signal to the optical subscriber device (ONT, 130) through the optical splitter (120). The optical subscriber device (ONT, 130) may use a network service through the optical signal received from the optical path termination device (OLT, 110) (S540).

6 is a flowchart illustrating a line failure diagnosis method according to an embodiment of the present invention.

Referring to FIG. 6 , the line failure diagnosis apparatus 200 according to the present invention may check whether a failure report is received from a service subscriber ( S605 ).

As a result of the check, when a failure report is received from the service subscriber, the line failure diagnosis device 200 detects customer information of the service subscriber, and based on this, the optical subscriber device 130 and the subscriber line can be inquired. (S610).

The line failure diagnosis device 200 connects to the optical fiber termination device (OLT, 110) connected to the optical subscriber device 130 of the service subscriber and receives line-related information from the device (OLT, 110), that is, the line of the subscriber who reported the failure. Related information and line related information of other subscribers sharing the optical splitter RN 120 with the corresponding subscriber may be acquired (S615). Here, the line-related information includes transmission power information of the optical path terminating device (sending side), distance information between the optical path terminating device and the optical subscriber device, and received signal strength (RSSI) information of the optical subscriber device (receiving side). can

The above three line-related information are related to each other. This can be confirmed through the calculation formula of the RSSI value, and the corresponding calculation formula can be defined as Equation 1 below.

Here, n is the propagation loss, D is the distance, and Tx Power is the transmission power.

Referring to Equation 1 above, it can be seen that the RSSI value of the receiving side is inversely proportional to the distance D and proportional to the transmission power Tx Power. This means that if the RSSI value and the TX power are known, the relative distance can be known. However, since this distance is a value that varies according to the received signal strength (RSSI), a difference may occur from the actual physical distance. Therefore, the distance between the optical fiber terminating device (OLT) and the optical subscriber device (ONT) is measured in a different way from the distance calculated by RSSI. The distance is calculated by measuring the time it is reflected and received back. Since this distance value is a distance calculated based on the time the light travels and the speed of light, it can be said to be a physically accurate distance.

The line failure diagnosis apparatus 200 stores, in a memory, the subscriber's line-related information obtained from the optical fiber termination device (OLT, 110) and the line-related information of other subscribers who share the optical splitter (RN, 120) with the subscriber. can

The line failure diagnosis apparatus 200 may analyze the optical level quality of the subscriber line in which the failure has been reported (S620). That is, the line failure diagnosis apparatus 200 uses the transmission power information and distance information obtained from the optical line termination device (OLT, 110), and the pre-stored optical loss information, the optical level quality of the subscriber line reported to be faulty (that is, RSSI value) can be predicted. Here, the optical loss information is loss information occurring in the PON-type optical subscriber network structure, and may include cable loss, connector loss, connection loss, insertion loss, and the like.

The circuit failure diagnosis apparatus 200 may compare the actual RSSI value and the predicted RSSI value of the subscriber line for which the failure has been reported to determine whether the corresponding RSSI values are similar ( S625 ). As a result of the check, when the actual RSSI value of the subscriber line and the predicted RSSI value are similar to each other, the line failure diagnosis apparatus 200 may determine that the state of the subscriber line reported to be faulty is normal ( S630 ). Meanwhile, as a result of the check, when the actual RSSI value of the subscriber line and the predicted RSSI value are not similar, the line failure diagnosis apparatus 200 may determine that there is a failure in the subscriber line or the optical splitter 120 .

The line failure diagnosis apparatus 200 may analyze the optical level quality of the subscriber line and other subscriber lines sharing the optical splitter RN 120 ( S635 ). That is, the line failure diagnosis apparatus 200 uses the transmission power information and distance information obtained from the optical path termination device (OLT, 110) and the pre-stored optical loss information of the other subscriber lines sharing the optical splitter 120. Light level quality (ie, RSSI value) can be predicted. This is to distinguish subscriber line failure and optical splitter failure.

The circuit failure diagnosis apparatus 200 may check whether the RSSI values are similar by comparing the actual RSSI values and the predicted RSSI values of all other subscriber lines sharing the optical splitter RN 120 with each other ( S640 ). As a result of the check, when the actual RSSI value and the predicted RSSI value of all other subscriber lines are similar to each other, the line failure diagnosis apparatus 200 may determine that a failure has occurred in the subscriber line reported to be faulty (S645). Meanwhile, as a result of the check, when the actual RSSI value and the predicted RSSI value of all other subscriber lines are not similar, the circuit failure diagnosis apparatus 200 may determine that a failure has occurred in the optical splitter (RN, 120) (S650). .

The line failure diagnosis apparatus 200 may store the failure diagnosis result in the memory and then display it on the display unit. Also, the line failure diagnosis apparatus 200 may provide the failure diagnosis result to the management server of the PON system 100 . Accordingly, the on-site engineer can access the management server to check the fault diagnosis result, and through this, can perform quick fault handling. That is, the on-site dispatch engineer can decide whether to replace the optical splitter (RN) or to visit the premises to check the incoming line based on the fault diagnosis result, which can shorten dispatch time and increase work efficiency. there is.

As described above, in the line failure diagnosis method according to the present invention, when a subscriber reports a failure, it is possible to remotely diagnose whether an optical splitter has failed by using line-related information obtained from an optical fiber termination device (OLT). In addition, the line failure diagnosis method can minimize customer service interruption time due to failure by guiding the physical location that requires action when dispatching to the field, and shorten the work time of on-site engineers.

7 to 9 are diagrams referenced to explain a method of diagnosing whether an optical splitter installed in a PON-type optical subscriber network is faulty.

7 is a diagram illustrating the structure of an optical subscriber network of a PON method. As shown in FIG. 7 , the PON-type optical subscriber network structure 700 includes an optical path termination device (OLT, 710), a first optical splitter 720, a second optical splitter 730, and a plurality of optical subscriber devices. s 740 may be included. Here, the first and second optical splitters 720 and 730 may branch a line 1:8.

The optical subscriber network structure 700 provides network services to subscribers through a total of two branches. The optical subscriber network structure 700 can accommodate a total of 64 subscribers by branching the line 1:8 through the first optical splitter 720 and 1:8 via the second optical splitter 730 . It is a structure that can

In such an optical subscriber network structure 700, since the first optical splitter 720 is generally located within a government office, the failure of the first optical splitter 720 can be simply checked by an engineer on-site. . Therefore, a method of diagnosing whether the second optical splitter 730 has failed will be described below.

8 and 9 are diagrams illustrating line-related information for each subscriber managed by an optical fiber termination device (OLT). 8 and 9, the optical fiber termination device (OLT, 710) is line information (ie, cable information), MAC address information, port activation information, operation state information, RSSI information, distance information, transmit power Information, received power information, voltage information, temperature information, etc. can be managed for each subscriber.

The optical fiber terminating device (OLT, 710), at the request of the line failure diagnosis device 200, line-related information including distance information between the transmitting side and the receiving side, RSSI information of the receiving side, and transmission power information of the transmitting side may be transmitted to the line failure diagnosis apparatus 200 . Here, the RSSI information is data actually measured by the optical path termination device (OLT, 710).

The line failure diagnosis apparatus 200 may predict the RSSI value of the subscriber line and other subscriber lines by using the transmission power information and distance information obtained from the optical line termination device (OLT) 710 and the pre-stored optical loss information. The predicted RSSI value may be used to diagnose whether the second optical splitter 730 has failed through comparison with the actual RSSI value.

The optical loss information used to predict the RSSI value is loss information occurring in the PON-type optical subscriber network structure, and may include cable loss, connector loss, connection loss, insertion loss, and the like.

As an example, loss information generated in the optical subscriber network structure 700 may be defined as shown in Tables 1 and 2 below according to the types of cables and optical splitters (RN). Corresponding loss information is stored in the line failure diagnosis apparatus 200 and is used to diagnose whether the optical splitter RN has failed.

loss type loss rate Cable loss (wavelength 1310nm) -0.35dB/km Cable loss (wavelength 1550nm) -0.25dB/km connector loss -1dB splice loss -0.1dB/km

RN type 1*4 1*8 1*16 1*32 number of channels 4 8 16 32 Insertion Loss (dB) 7.0 10.4 13.8 16.8

First, it is assumed that a failure report is received for a subscriber line having ID 1/1-2 among the subscriber lines shown in FIG. 8 . In this case, the line failure diagnosis apparatus 200 may obtain transmission power information, distance information, and RSSI information about the corresponding subscriber line 1/1 - 2 from the optical line termination device (OLT, 110). In this case, the transmit power is 0.76 dB, the distance is 9274 m, and the RSSI value is -25.37 dB.

The line failure diagnosis apparatus 200 may predict the RSSI value of the corresponding subscriber line 1/1-2 by using the acquired transmission power information, distance information, and pre-stored optical loss information. For example, the line failure diagnosis apparatus 200 may predict the RSSI value of the corresponding subscriber line 1/1 - 2 through Equation 2 below.

The line failure diagnosis apparatus 200 may compare the actual RSSI value of the corresponding subscriber line 1/1-2 and the predicted RSSI value with each other. As a result of the comparison, if the actual RSSI value (-25.37 dB) and the predicted RSSI value (-25. can

Meanwhile, it is assumed that a failure report is received for a subscriber line having ID 9/7-6 among the subscriber lines shown in FIG. 9 . In this case, the line failure diagnosis apparatus 200 may obtain transmission power information, distance information, and RSSI information about the subscriber line 9/7 - 6 from the optical line termination device (OLT, 110). In this case, the transmit power is 1.50 dB, the distance is 12814 m, and the RSSI value is -30.78 dB.

The line failure diagnosis apparatus 200 may predict the RSSI value of the corresponding subscriber line 9/7-6 by using the acquired transmission power information and distance information, and optical loss information stored in advance. For example, the line failure diagnosis apparatus 200 may predict the RSSI value of the corresponding subscriber line 9/7-6 through Equation 3 below.

The line failure diagnosis apparatus 200 may compare the actual RSSI value of the corresponding subscriber line 9/7-6 with the predicted RSSI value. As a result of the comparison, when the actual RSSI value (-25.37 dB) and the predicted RSSI value (-25. It can be determined that there is a disability in (730).

In order to distinguish the subscriber line failure from the optical splitter failure, the line failure diagnosis apparatus 200 predicts the RSSI values of all other subscriber lines sharing the corresponding subscriber line 9/7-6 and the second optical splitter 730. can The circuit failure diagnosis apparatus 200 may compare the actual RSSI value and the predicted RSSI value of all other subscriber lines sharing the second optical splitter RN 730 with each other.

Subscriber line type Prediction RSSI comparison ground truth RSSI 9/7-1 -24.3407 > -25.2936 9/7-2 -26.2283 > -29.01 9/7-4 -25.3549 > -28.20 9/7-6 -25.7653 > -30.78 9/7-34 -25.2301 > -28.72 9/7-36 -25.2936 > -25.79

As shown in Table 3 above, as a result of the comparison, when the actual RSSI value and the predicted RSSI value of other subscriber lines are not similar to each other, the circuit failure diagnosis apparatus 200 detects a failure in the second optical splitter (RN, 730). can be considered to have occurred. Meanwhile, when the actual RSSI value and the predicted RSSI value of the other subscriber lines are similar to each other, the line failure diagnosis apparatus 200 may determine that a failure has occurred in the corresponding subscriber line 9/7-6.

10 is a block diagram of a computing device according to an embodiment of the present invention.

Referring to FIG. 10 , the computing device 1000 according to an embodiment of the present invention includes at least one processor 1010 , a computer-readable storage medium 1020 , and a communication bus 1030 . The computing device 1000 may be one or more components included in the circuit failure diagnosis apparatus 200 described above.

The processor 1010 may cause the computing device 1000 to operate according to the aforementioned exemplary embodiment. For example, the processor 1010 may execute one or more programs 1025 stored in the computer-readable storage medium 1020 . The one or more programs may include one or more computer-executable instructions, which, when executed by the processor 1010 , configure the computing device 1000 to perform operations according to the exemplary embodiment. can be

Computer-readable storage medium 1020 is configured to store computer-executable instructions or program code, program data, and/or other suitable form of information. The program 1025 stored in the computer-readable storage medium 1020 includes a set of instructions executable by the processor 1010 . In one embodiment, computer-readable storage medium 1020 includes memory (volatile memory, such as random access memory, non-volatile memory, or a suitable combination thereof), one or more magnetic disk storage devices, optical disk storage devices, flash It may be memory devices, other types of storage media accessed by the computing device 1000 and capable of storing desired information, or a suitable combination thereof.

Communication bus 1030 interconnects various other components of computing device 1000 , including processor 1010 and computer-readable storage medium 1020 .

Computing device 1000 may also include one or more input/output interfaces 1040 and one or more network communication interfaces 1060 that provide interfaces for one or more input/output devices 1050 . The input/output interface 1040 and the network communication interface 1060 are connected to the communication bus 1030 . The input/output device 1050 may be connected to other components of the computing device 1000 through the input/output interface 1040 . The exemplary input/output device 1050 includes a pointing device (such as a mouse or trackpad), a keyboard, a touch input device (such as a touchpad or touch screen), a voice or sound input device, various types of sensor devices, and/or imaging devices, such as input devices, and/or output devices such as display devices, printers, speakers and/or network cards. The exemplary input/output device 1050 may be included in the computing device 1000 as a component constituting the computing device 1000 , and may be connected to the computing device 1000 as a separate device distinct from the computing device 1000 . may be

The present invention described above can be implemented as computer-readable codes on a medium in which a program is recorded. The computer-readable medium may continuously store a computer-executable program or may be temporarily stored for execution or download. In addition, the medium may be various recording means or storage means in the form of a single or several hardware combined, it is not limited to a medium directly connected to any computer system, and may exist distributed on a network. Examples of the medium include a hard disk, a magnetic medium such as a floppy disk and a magnetic tape, an optical recording medium such as CD-ROM and DVD, a magneto-optical medium such as a floppy disk, and those configured to store program instructions, including ROM, RAM, flash memory, and the like. In addition, examples of other media may include recording media or storage media managed by an app store that distributes applications, sites that supply or distribute various other software, and servers. Accordingly, the above detailed description should not be construed as restrictive in all respects but as exemplary. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included in the scope of the present invention.

200: line failure diagnosis device 210: failure reception unit
220: line information collection unit 230: line analysis unit
240: fault diagnosis unit

Claims (15)

Upon receipt of a failure report of a subscriber, checking the subscriber's line and connecting to an optical fiber termination device (OLT) connected to the subscriber line;
collecting the line-related information of the subscriber and line-related information of other subscribers sharing the subscriber line and an optical splitter (RN) from the optical fiber termination device (OLT);
predicting optical level quality information of a subscriber line and other subscriber lines based on the collected line-related information; and
and diagnosing whether the optical splitter (RN) is faulty by using the predicted optical level quality information. According to claim 1,
The line-related information includes transmission power information, distance information, and optical level quality information. 3. The method of claim 2,
The optical splitter failure diagnosis method in a passive optical subscriber network structure, characterized in that the optical level quality information is Received Signal Strength Indication (RSSI) information. 3. The method of claim 2,
The distance information and light level quality information are calculated by measuring the light reflected from the optical subscriber device (ONT) after irradiating light from the optical path termination device (OLT) to the optical subscriber device (ONT) of the subscriber A method for diagnosing an optical splitter failure in a passive optical subscriber network structure. The method of claim 2, wherein the predicting step comprises:
Passive optical subscriber network, characterized in that the optical level quality information of the subscriber line and other subscriber lines is predicted using the transmission power information and distance information obtained from the optical fiber terminating device (OLT), and optical loss information stored in advance. Methods for diagnosing optical splitter failures in structures. 6. The method of claim 5,
The optical loss information includes cable loss, connector loss, connection loss, and insertion loss occurring in the passive optical subscriber network structure. The method of claim 2, wherein the diagnosis step comprises:
A passive optical subscriber network structure, characterized in that the optical splitter (RN) is remotely diagnosed by comparing the predicted optical level quality value with the actual optical level quality value collected from the optical path termination device (OLT) A method for diagnosing optical splitter failures in The method of claim 7, wherein the diagnosis step comprises:
When the actual optical level quality value of the subscriber line and the predicted optical level quality value are within a predetermined error range, it is diagnosed that there is no failure in the subscriber line. diagnostic method. The method of claim 7, wherein the diagnosis step comprises:
Passive optical subscriber network structure, characterized in that when the actual optical level quality value and the predicted optical level quality value of the subscriber line and other subscriber lines are out of a predetermined error range, it is diagnosed that a failure has occurred in the optical splitter (RN) A method for diagnosing optical splitter failures in The method of claim 7, wherein the diagnosis step comprises:
When the actual light level quality value and the predicted light level quality value of the subscriber line are out of a predetermined error range, and the actual light level quality value and the predicted light level quality value of the other subscriber lines are within the predetermined error range, the subscriber A method for diagnosing a failure of an optical splitter in a passive optical subscriber network structure, characterized in that it is diagnosed as a line failure. A computer program stored in a computer-readable recording medium so that the method according to any one of claims 1 to 10 is executed on a computer. a failure reception unit that receives a failure report requested from a subscriber and checks the subscriber's line;
a line information collecting unit for collecting the subscriber's line-related information and line-related information of other subscribers who share the subscriber line and an optical splitter (RN) from an optical fiber termination device (OLT);
a line analyzer for predicting optical level quality information of a subscriber line and other subscriber lines based on the collected line-related information; and
and a failure diagnosis unit for diagnosing whether the optical splitter (RN) has failed by using the predicted optical level quality information. 13. The method of claim 12,
The line-related information includes transmission power information, distance information, and optical level quality information. 14. The method of claim 13,
The line analysis unit predicts the optical level quality information of the subscriber line and other subscriber lines by using the transmission power information and distance information obtained from the optical path termination device (OLT), and optical loss information stored in advance. A device for diagnosing optical splitter failures in a passive optical subscriber network structure. 14. The method of claim 13,
The failure diagnosis unit compares the actual light level quality value collected from the optical path termination device (OLT) with the predicted light level quality value to remotely diagnose whether the light splitter (RN) is faulty. An optical splitter failure diagnosis device in a passive optical subscriber network structure.

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