JP7323226B1 - Terminal device, analysis method, and program - Google Patents

Abstract

A termination device, an analysis method, and a program that contribute to detecting signs of failure in an optical interface section in an optical communication line are provided. An acquisition unit that acquires line status data indicating the status of a communication line at predetermined intervals, an accumulation unit that accumulates the line condition data, and an analysis that analyzes the line condition data accumulated in the accumulation unit. and an output unit for outputting the analysis result of the analysis unit, wherein the acquisition unit acquires the line status data in pairs on the transmission side and the reception side, and stores them in the storage unit. Provide a terminating device. [Selection drawing] Fig. 1

Description

The present invention relates to a terminal device, an analysis method, and a program.

A PON (Passive Optical Network) system adopts a format in which terminal units (ONUs: Optical Network Units) of a plurality of users are connected to one optical line and used in a time-sharing manner. It has the function of transmitting and receiving optical signals. In particular, in a user optical module mounted on an OLT (Optical Line Terminal), since ONUs of multiple users are connected to one PON optical line, its failure will stop communication of multiple users. Therefore, there is a demand for improved reliability.

JP 2017-195453 A

In addition, each disclosure of the above prior art documents is incorporated into this document by reference. The following analysis was made by the inventors.

In order to improve the reliability, a solution has been proposed, for example, as disclosed in Patent Document 1. In the solution of Patent Document 1, the DDM (digital diagnostics monitoring) function for checking the status of the optical module used for optical fiber communication is used as much as possible, and the creation of a mechanism that is useful for analysis at the time of failure is studied. so that it can be incorporated into the system. That is, a device having an optical network by utilizing a user-usable area of an EEPROM (Electrically Erasable Programmable Read-Only Memory) of an optical module as a log storage area with time information and analyzing the log information when a failure occurs, Alternatively, the suspected location can be specified without recovering the optical module. In this embodiment, the operational status of the optical module itself and the operational status of the interface connected to the optical module are periodically checked, and the operational status is recorded in the EEPROM of the optical module. Then, the record (log) is provided to the device connected by the optical module and the optical fiber.

However, in the current 10GEPON (Gigabit Ethernet-Passive Optical Network) system, a standardized management interface function is used for state management of the XFP (10 Gigabit Small Form Factor Pluggable) module of the OLT and the optical interface of the ONU. However, regarding the failure judgment of the optical interface section, it is determined whether the optical level is within the threshold value using the optical transmission/reception level management function, and hardware failure of each optical module. , and there is a problem that it is impossible to detect a premonitory state leading to a failure.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a termination device, an analysis method, and a program that contribute to detecting signs of failure in an optical interface section in an optical communication line.

According to a first aspect of the present invention or the disclosure, an acquisition unit acquires line status data indicating a state of a communication line at predetermined intervals, an accumulation unit accumulates the line condition data, and the data is stored in the accumulation unit. and an output unit for outputting the analysis result of the analysis unit, wherein the acquisition unit acquires the line condition data in pairs on the transmission side and the reception side. and accumulating in said accumulator.

According to a second aspect of the present invention or disclosure, a step of acquiring line status data indicating a state of a communication line at predetermined intervals, a step of accumulating the line status data, and a step of analyzing the line status data. and a step of outputting an analysis result, wherein the step of obtaining the line status data acquires the line status data paired by the transmitting side and the receiving side, and accumulates them in a storage area. provided.

According to a third aspect of the present invention or disclosure, a process of acquiring line status data indicating the status of a communication line at predetermined intervals, a process of accumulating the line status data, and a process of analyzing the line status data. and a process of outputting the analysis result, wherein the process of acquiring the line status data acquires the line status data paired by the transmitting side and the receiving side, and accumulates them in a storage area. A program is provided to do so.

According to each aspect of the present invention and disclosure, the present invention provides a termination device, analysis method, and program that contribute to detecting a sign of failure in an optical interface section in an optical communication line.

It is a block diagram which shows an example of a structure of the terminal device which concerns on one Embodiment. 4 is a flow chart showing an example of the operation of the terminating device according to the first embodiment; 3 is a schematic diagram showing the hardware configuration of the terminal device according to the first embodiment; FIG. FIG. 10 is a diagram showing an overview of a PON system including a terminal device (OLT) according to a second embodiment; FIG. It is a figure which shows one structural example of the terminal device (OLT) which concerns on 2nd Embodiment. FIG. 10 is a diagram showing an example of optical transmission/reception level analysis between an XFP and an ONU; FIG. 4 is a schematic diagram for showing the optical reception level at the XFP of the OLT and the optical reception level at the SFP of each ONU;

First, an overview of one embodiment will be described. It should be noted that the drawing reference numerals added to this outline are added to each element for convenience as an example to aid understanding, and the description of this outline does not intend any limitation. Also, connecting lines between blocks in each figure include both bi-directional and uni-directional. The unidirectional arrows schematically show the flow of main signals (data) and do not exclude bidirectionality. Furthermore, in the circuit diagrams, block diagrams, internal configuration diagrams, connection diagrams, etc. disclosed in the present application, an input port and an output port exist at the input end and the output end of each connection line, respectively, although not explicitly shown. The input/output interface is the same.

FIG. 1 is a block diagram showing an example of the configuration of a terminal device 10 according to one embodiment. As shown in this figure, the terminal device 10 according to one embodiment has an acquisition unit 11, an accumulation unit 12, an analysis unit 13, and an output unit .

Acquisition unit 11 acquires line status data indicating the status of a communication line at predetermined intervals. The accumulation unit 12 accumulates line status data. Analysis unit 13 analyzes the line status data accumulated in accumulation unit 12 . The output unit 14 outputs the analysis result of the analysis unit 13 .

The terminating device 10 of one embodiment is characterized in that the acquiring unit 11 acquires line status data in pairs on the transmitting side and the receiving side, and stores them in the storage unit 12 . The line status data in the storage unit 12 is analyzed by the analysis unit 13 . By accumulating and analyzing the line status data of the sending side and the receiving side as a pair, it is possible to provide a standardized management interface function. By performing a comprehensive analysis from a multifaceted point of view, such as changes in line status data, it is possible to detect failures in network equipment and lines or their signs.

As a result, it is possible to prevent the service from being stopped due to the sudden stop of communication due to a failure, and it is possible to improve the reliability of the service.

It should be noted that the terminal device 10 in one embodiment can be applied to other communication schemes besides application to optical fiber communication. For example, it can be applied to wireless communication and communication using media other than optical fiber, such as metal.

Specific embodiments will be described in more detail below with reference to the drawings. In addition, the same code|symbol is attached|subjected to the same component in each embodiment, and the description is abbreviate|omitted.

[First Embodiment]
An example of the configuration of the terminal device according to the first embodiment is the same as that shown in FIG. As shown in FIG. 1, the terminal device 10 according to this embodiment has an acquisition unit 11, a storage unit 12, an analysis unit 13, and an output unit .

Acquisition unit 11 acquires line status data indicating the status of a communication line at predetermined intervals. "Obtain every predetermined period" means, for example, when the predetermined period is one week, when the next acquisition is one week after the line status data is acquired, and for example, when the device status acquisition interval is one hour. This includes any case in which these states are collectively sent to the storage section 12 as line status data every week, and stored. A "communication line" may be wired or wireless, as described above. Also, the communication medium is not limited to optical fiber. The "line status data" includes at least data indicating the status of signals acquired by the transmitting side and the receiving side. This data may be obtained for existing, standard management protocols. For example, the data may be acquired by the communication interfaces of the transmission side and the reception side, and the data acquired by the terminal device 10 that is the communication destination of the terminal device 10 having the acquisition unit 11 is transmitted via the communication line to the terminal device 10 may be sent to

The “predetermined period” may be an arbitrary period, but it is most suitable for the analysis unit 13 to detect signs of failure most accurately or early based on the characteristics of each line status data acquired by the acquisition unit 11. It may be a set period. For example, changes in the signal level may be acquired as line status data every week, stored in the storage unit 12, and analyzed.

The length of the predetermined period may be variable. For example, the default value is set to acquire the line status data every week, and if any abnormality is detected, the acquisition period may be shortened every day or every hour.

In the terminating device 10 of the present embodiment, as described above, the acquiring unit 11 acquires the line status data in pairs on the transmitting side and the receiving side, and stores them in the storage unit 12 . As a result, for example, by calculating the signal level difference of downstream communication over a predetermined period in the analysis unit 13, it is possible to perform processing such as detection of signs of line failure.

“Paired” means that the line status data at both ends of a line for transmitting and receiving data, or at the beginning and end of a section are acquired in association with each other. In this case, as viewed from the terminal device 10 having the acquisition unit 11, it may be the line status data of the downlink communication, the line status data of the uplink communication, or both of them. As described above, the feature of the present invention is that the analyzing unit 13 comprehensively analyzes a plurality of line status data to detect a sign of a failure in addition to simply detecting a failure at one point.

The accumulation unit 12 accumulates line status data. The line status data is stored in the storage area of the terminal device 10 or the storage area of the device connected to the terminal device 10 . Accumulation is performed, for example, in such a manner that line status data on the transmission side and the reception side of downlink communication are stored in a storage area in association with each other.

Analysis unit 13 analyzes the line status data accumulated in accumulation unit 12 . The purpose of "analysis" is to detect signs of equipment or line failure. The "analysis" of the present invention includes the step of extracting the line status data from multiple points of view and processing it as necessary to evaluate and judge the presence or absence of signs of failure.

The output unit 14 outputs the analysis result of the analysis unit 13 . Specifically, the analysis result is acquired from the analysis unit 13, transmitted to the terminal via a communication line or the like, and the analysis result is displayed and output on an input/output interface such as a display of the terminal.

[Explanation of operation]
An example of the operation of the terminal device 10 of this embodiment will be described with reference to FIG. FIG. 2 is a flow chart showing an example of the operation of the terminal device 10 according to the first embodiment.

As shown in this figure, when the terminating device 10 starts its operation, it acquires line status data (step S22) after a predetermined period of time has elapsed (step S21, Y). Next, the acquired data are accumulated (step S23). Next, the accumulated line status data is analyzed (step S25), but before that, there may be processing for determining whether or not to start analysis (step S24). After the analysis is completed, the analysis result is output (step S26).

[Hardware configuration]
The terminal device 10 of the present embodiment can be configured by an information processing device (computer), and has the configuration illustrated in FIG. 3 . For example, the terminal device 10 includes a CPU (Central Processing Unit) 31, a memory 32, an input/output interface 33, a communication means such as a NIC (Network Interface Card) 34, etc., which are interconnected by an internal bus 35. FIG.

However, the configuration shown in FIG. 3 is not meant to limit the hardware configuration of the terminal device 10 . The terminal device 10 may include hardware (not shown), and may not have the input/output interface 33 if necessary. Also, the number of CPUs and the like included in the terminal device 10 is not limited to the example shown in FIG.

The memory 32 is a RAM (Random Access Memory), a ROM (Read Only Memory), an auxiliary storage device (hard disk, etc.).

The input/output interface 33 is means that serves as an interface for a display device and an input device (not shown). The display device is, for example, a liquid crystal display. The input device is, for example, a device that receives user operations such as a touch panel, keyboard, or mouse.

The functions of the terminating device 10 are implemented by a program group (processing module) such as an acquisition program, an analysis program, and an output program stored in the memory 32, and a data group in which acquired line status data is accumulated. The processing module is implemented by the CPU 31 executing each program stored in the memory 32, for example. Also, the program can be downloaded via a network or updated using a storage medium storing the program. Furthermore, the processing module may be realized by a semiconductor chip. In other words, it is sufficient if there is means for executing the functions performed by the processing module by some kind of hardware and/or software.

[Hardware operation]
When the terminal device 10 starts to operate, first the acquisition program is called from the memory 32 and is put into an execution state by the CPU 31 . The acquisition program acquires line status data via the NIC 34 after a predetermined period of time has elapsed. The acquired line status data are associated with each other and stored in an area for storing line status data in memory 32 .

Next, the analysis program is called from the memory 32 and executed by the CPU 31 . The analysis program uses line status data to perform analysis. For example, for signal levels in uplink and downlink communications, the level difference between the signal level acquired by the device on the transmitting side and the signal level acquired by the device on the receiving side is calculated, and these level differences between the uplink and the downlink are further calculated. Processing such as calculating the difference is executed. The analysis program, for example, determines whether the calculated difference is within a predetermined range, and if it is within the predetermined range, determines that there is a sign of failure.

Next, the output program is called from the memory 32 and executed by the CPU 31, and the determination result is obtained from the analysis program. The same program transmits the result of determination to a terminal device or the like connected to the network via the NIC 34, and is output by an input/output interface such as a display of the terminal device or the like.

[Explanation of effect]
By accumulating and analyzing the line status data of the transmitting side and the receiving side as a pair by the terminal device according to the first embodiment, it is possible to simply monitor the single device provided by the standardized management interface function. It is possible to detect failures and signs of failures in network equipment and lines by conducting comprehensive analysis from multiple perspectives, such as changes in long-term line status data, in addition to detecting failures, etc. .

[Second embodiment]
In the second and subsequent embodiments, the configuration and operation when the terminal device (OLT) of the above embodiments is applied to an optical fiber line, particularly a PON system, will be described.

[overview]
FIG. 4 is a diagram showing an outline of a PON system including a terminal device (OLT) of this embodiment. The PON system includes an optical fiber connecting the OLT 41, a plurality of communication terminals, ONU#1 45, ONU#2 48, ONU#3 49, . , and an optical splitter. The OLT 41 is connected to a relay station of a telecommunications carrier via a network.

In the GEPON system, as shown in FIG. 4, an electrical signal for PON communication controlled by the PON MAC unit 42 of the OLT 41 is converted into an optical transmission/reception signal by the XFP type optical module 43, and an optical signal is generated by an optical fiber and an optical splitter. The signal is input/output to/from the SFP type optical module 46 of the ONU #1 45 via the communication path, converted again from the optical transmission/reception signal to the PON communication electric signal, and input/output to/from the PON MAC unit 47, thereby enabling PON communication. It has become.

ONU #2 48, ONU #3 49, etc. are also connected to the PON optical communication path at the same time, and data communication between the host network and each user is realized by time-division communication control of PON communication. In the current fiber ON system, the state of the optical interface section of each XFP module on the OLT side is determined according to the XFP MSA (Multi Source Agreement) standard "10 Gigabit Small form Factor Pluggable Module", INF 8077i. can be collected using the management interface DDMI (Digital Diagnostic Memory Indicator) function standardized in , and in this embodiment, the information is collected at the portion indicated by the dotted line from the XFP optical module 43 to the PON MAC unit 42 .

In each user's communication terminal (ONU), similarly, a function that can collect data using DMI (Diagnostic Monitoring Interface) standardized by MSA's SFP+ standard SFF-8431 and its management interface standard SFF-8472 was implemented and collected. Data such as the optical transmission/reception level can be put on the PON management protocol and sent to the OLT side, and the data of each ONU can be collected by the PON MAC section 42 of the OLT 41 . Each ONU connected in plurality has a similar function.

The optical transmission/reception level data of the XFP type optical module 43 adopted for each PON interface of the OLT 41 and the SFP+ of each ONU are collected by the PON MAC section 42 of the OLT 41 by the above-mentioned function, and constantly monitored by the state monitor and setting section 44. Management is performed by periodically recording and transferring to a management device in the upper network.

[composition]
FIG. 5 shows the configuration of the terminal device (OLT) of this embodiment. The OLT 100 includes a collection unit 101 , a storage unit 102 and an output unit 103 . The collection unit 101 collects the states of the XFP optical module of the OLT 100 and the SFP optical modules of each ONU, and stores them in the storage unit 102 . The output unit 103 analyzes the data for a certain period of time and, when a sign of failure is detected, notifies the upper network device (relay station of the communication carrier). The PON MAC unit 42 of FIG.

The frequency of collecting the status is assumed to be, for example, every 2 hours, but may be either a fixed period or an irregular period.

The output unit 103 analyzes using the collected data for a certain period of time (for example, one week), and when a sign of failure is detected, notifies the upper network device (relay station of the communication carrier). In this embodiment, the collected state is monitored as a signal of each transmission/reception pair (by calculating the difference between the transmission level and the reception level, analysis excluding the influence of the transmission side can be performed), and for a certain period of time (for example, It is characterized by detecting a transmission level, a reception level, and a sign of failure of an optical fiber by analyzing data for one week.

FIG. 6 shows an example of optical transmission/reception level analysis between the XFP and the ONU. XFP-TX, XFP-RX, and XFP-RX* are part of the data collected from the XFP type optical module (XFP-RX* is the reception level when no signal is received), and ONU-RX , ONU-TX are part of the data collected from the SFP optical module of the ONU. The ONU status is collected for each ONU, but data for each ONU is not described separately in FIG. In addition, in order to monitor the transmission/reception pair signal, the downstream signal level difference, the upstream signal level difference, and the value obtained by dividing the downstream signal level difference by the wavelength loss (for example, 0.3) and the upstream signal level difference are used. The level difference between the upper and lower level signals, which is the difference between the values divided by the loss of the wavelength (for example, 0.4), is calculated and stored.

Note that the data described in a range such as +2 to +4 indicates that the data for a certain period of time varies (actually, for example, +2, +4, +2, etc. are stored each time they are collected). is being used).

ONU#2 shows an example of OLT transmission level NG. Because the OLT transmission level XFP-TX varies from +2 to +4, the ONU reception level ONU-RX varies from -11 to -9. Therefore, it can be determined that the OLT transmission level is NG (prediction).

ONU#3 shows an example of the reception level NG of the OLT. The ONU transmission level is constant at +6.5, the OLT reception level XFP-RX varies from -11.5 to -8.5, and the differential upstream signal level difference varies from 15 to 18. It can be judged as level NG (prediction). In addition, since a level not normally seen is observed in the non-communication section XFP reception level XFP-RX*, it is conceivable that the receiving device is degraded.

ONU#4 shows an example of ONU transmission level NG. Since the ONU transmission level ONU-TX varies from +6 to +9, the OLT reception level XFP-RX varies from -11.5 to -8.5, but the upstream signal level difference, which is the difference, is 17. Since it is constant at 0.5 and does not fluctuate, it can be determined that the transmission level of the ONU is NG (prediction).

ONU#5 shows an example of ONU reception level NG. The OLT transmission level is constant at +3, the ONU reception level ONU-RX varies from -11 to -9, and the difference in the downlink signal level difference varies from 12 to 14, so the ONU reception level is NG (prediction). I can judge.

ONU#6 shows an example of fiber NG. Since the upstream signal level difference and the downstream signal level difference vary at the same timing, it can be determined that the fiber is NG (prediction).

In the case of the fiber NG of ONU #6, it is possible to isolate the problem of the trunk part/branch part of the optical fiber of the PON network by comparing the state of other ONUs. In addition, when the reception level of the OLT of ONU #5 is NG, by comparing with the state of other ONUs, the reception circuit of the XFP type optical module, especially the AGC (Automatic Gain Control) function (with a level difference from each ONU). signal is input) can be monitored.

FIG. 7 is a schematic diagram showing the optical reception level at the XFP of the OLT and the reception level at the SFP of each ONU. As shown in (A) of this figure, the optical reception level at the XFP of the OLT is generally almost constant due to fiber attenuation according to the distance to each ONU. Also, as shown in (B) of this figure, the optical reception level at the SFP of each ONU is also generally constant due to fiber attenuation according to the distance from each ONU. In the case of fiber NG of ONU #6, both the optical reception levels on the OLT side and the ONU side assigned to each ONU in the states of (A) and (B) of FIG. 7 fluctuate. , the problem can be isolated if the problem occurs in the branch portion of the optical fiber.
The error correction status and distance information (the distance is calculated from the difference between the transmission time and the reception time) with each ONU managed by the PON system may also be stored and analyzed.
In the 10GEPON system, an FEC (Forward Error Correction) function can be set in the upward direction from ONU to XFP, and has a function of monitoring the error correction status. By adding the error correction status to the analysis as a quality index of optical communication, it can be used for predictive detection of XFP and ONU failure of each PON interface. For example, when the number of error corrections increases, it may be a sign of failure. Since the FEC function also has the aspect of ensuring the communication state when the received light level is low, it is possible to perform more appropriate sign detection by analyzing the correlation with the transmission and reception light level. Further, since the distance information is usually constant due to communication delay, if it changes in time series, it may be a sign of failure.

[Explanation of effect]
According to the terminal device (OLT) of this embodiment, by monitoring the collected state as a signal of each transmission/reception pair and analyzing using data for a certain period of time, the transmission level that cannot be judged as NG in the state collected each time , the reception level, and the sign of failure of the fiber can be detected. By comparing the detected failure signs with the states of other ONUs, it is possible to isolate problems in the trunk/branch portions of the optical fiber and to monitor the state of the receiving circuit of the XFP type optical module, especially the AGC function.

As described above, the terminal device (OLT) of the present embodiment can predict the failure of each optical interface unit before an XFP failure or an ONU failure occurs. Communication outages can be reduced.

Some or all of the above-described embodiments can also be described as the following appendices. However, each of the following supplementary notes is merely an example of the present invention, and the present invention is not limited to such cases.
[Appendix 1]
This is the same as the terminating device according to the first aspect described above.
[Appendix 2]
Preferably, the terminating device according to appendix 1, wherein the analysis unit performs analysis by calculating a difference in signal level between the transmission side and the reception side of the line status data.
[Appendix 3]
The analysis unit performs analysis based on the difference in signal level between the transmitting side and the receiving side in uplink communication and the difference in signal level between the transmitting side and the receiving side in downlink communication, preferably the terminating device of Appendix 2. .
[Appendix 4]
Preferably, the terminating device according to appendix 3, wherein the acquisition unit acquires the signal level of the non-communication section as the line status data, and the analysis unit performs analysis based on the signal level of the non-communication section.
[Appendix 5]
Preferably, the terminating device according to appendix 1, wherein the acquiring unit acquires the error detection and correction frequency as the line status data, and the analysis unit performs analysis based on the error detection and correction frequency.
[Appendix 6]
Preferably, the terminating device according to appendix 1, wherein the acquisition unit acquires distance information between the transmission side and the reception side as the line status data, and the analysis unit performs analysis based on the distance information.
[Appendix 7]
Preferably, the terminating device according to any one of Appendices 1 to 6, wherein the communication line is an optical fiber line, and the obtaining unit obtains the line status by collecting the states of optical transceivers connected to the communication line.
[Appendix 8]
The communication line is a line of a PON system, and the obtaining unit obtains the state of the optical transceiver on the OLT side and the optical transceiver on the ONU side as line status data, preferably the terminating device according to appendix 7.
[Appendix 9]
This is the analysis method for the second viewpoint described above.
[Appendix 10]
This is the same as the program related to the third viewpoint mentioned above.
It should be noted that Addendums 9 and 10 can be developed into Addendums 2 to 8 in the same way as Addendum 1.

The disclosures of the cited patent documents and the like are incorporated herein by reference. Within the framework of the full disclosure of the present invention (including the scope of claims), it is possible to modify or adjust the embodiment or the embodiment based on the basic technical concept thereof. Also, various combinations or selections of various disclosure elements (including each element of each claim, each element of each embodiment or embodiment, each element of each drawing, etc.) within the framework of the full disclosure of the present invention (including partial deletion) is possible. That is, the present invention naturally includes various variations and modifications that can be made by those skilled in the art according to the entire disclosure including claims and technical ideas. In particular, any numerical range recited herein should be construed as specifically recited for any numerical value or subrange within that range, even if not otherwise stated.

10: Terminal device 11: Acquisition unit 12: Storage unit 13: Analysis unit 14: Output unit 31: CPU
32: memory 33: input/output interface 34: NIC
35: Internal bus 41: OLT
42: PON MAC unit 43: XFP type optical module 44: Status monitor and setting unit 45: ONU#1
46: SFP type optical module 47: PON MAC unit 48: ONU#2
49: ONU#3
100: OLT
101: collection unit 102: storage unit 103: output unit

Claims (9)

an acquisition unit that acquires line status data indicating the status of a communication line at predetermined intervals;
an accumulation unit for accumulating the line status data;
an analysis unit that analyzes the line status data accumulated in the accumulation unit;
an output unit that outputs the analysis result of the analysis unit;
the acquiring unit acquires distance information between the transmitting side and the receiving side as the line status data in pairs on the transmitting side and the receiving side, and stores the distance information in the storage unit;
The analysis unit performs analysis based on the distance information.
terminating device. The analysis unit analyzes the line status data by calculating a difference in signal level between a transmission side and a reception side.
The termination device of Claim 1. The analysis unit performs analysis based on a difference in signal level between the transmitting side and the receiving side in uplink communication and a difference in signal level between the transmitting side and the receiving side in downlink communication.
3. The termination device of claim 2. The acquisition unit acquires a signal level in a non-communication section as the line status data,
The analysis unit performs analysis based on the signal level of the non-communication section,
4. The termination device of claim 3. The acquisition unit acquires an error detection and correction frequency as the line status data,
The analysis unit performs analysis based on the error detection and correction frequency.
The termination device of Claim 1. the communication line is an optical fiber line,
the obtaining unit obtains the line status by collecting the states of optical transceivers connected to the communication path;
A terminating device as claimed in any one of claims 1 to 5 . The communication line is a line of a PON system, and the acquisition unit acquires the state of the optical transceiver on the OLT side and the optical transceiver on the ONU side as the line status data.
7. The termination device of claim 6 . A computer-implemented method of analysis comprising:
a step of acquiring line status data indicating the status of a communication line at predetermined intervals;
a step of accumulating the line status data;
analyzing the line status data;
and outputting the analysis result,
The step of acquiring the line status data acquires distance information between the transmitting side and the receiving side as the line status data in pairs on the transmitting side and the receiving side, and stores the distance information in a storage area;
In the step of analyzing the line status data, analysis is performed based on the distance information.
Analysis method. a process of acquiring line status data indicating the status of a communication line at predetermined intervals;
a process of accumulating the line status data;
a process of analyzing the line status data;
and a process of outputting analysis results,
In the process of acquiring the line status data , distance information between the transmitting side and the receiving side is acquired as the line status data in pairs on the transmitting side and the receiving side, and stored in a storage area;
In the process of analyzing the line status data, analysis is performed based on the distance information.
A program that makes a computer run.

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