Determination device and determination method

Abstract

This determination device comprises a processing unit that causes a predetermined device to perform a function that uses a fixed power consumption, calculates a current static capacitance of a power storage unit on the basis of the fixed power consumption and voltage values of the power storage unit of the predetermined device before and after the execution of the function, and determines the normality of the power storage unit on the basis of a difference between the current static capacitance of the power storage unit and the static capacitance before the start of the use of the power storage unit.

Description

[Technical Field]

[0001] The present disclosure relates to a determination device and a determination method. [Background technology]

[0002] In the access network, the work of switching core lines is carried out.

[0003] Non-patent document 1 describes a technology in which, in a system comprising a power supply control light source installed in a power supply environment such as within a central office, and an optical path switching node (optical node) installed on an optical fiber network, a single laser power supply control light is used to simultaneously supply optical power to the optical node and control multiple optical switches included in the optical node.

[0004] The optical node receives a control signal superimposed on the power supply control light and controls devices such as an optical switch based on the received control signal. For example, the optical node performs operations such as interconnecting optical fiber cores and switching cores on an individual core-wire basis. Non-Patent Document 2 describes that the optical node performs core switching using an optical switch with an optical cross-connect function included in the optical node, acquires optical intensity measurement data using a port monitoring function, and transmits various data based on the instruction operations in the control signal. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] Kawano, et al., "Study on remote optical path switching nodes for future optical access networks," Institute of Electronics, Information and Communication Engineers General Conference, March 9-12, 2021, Proceedings of the Communications Conference 2, B-13-16, p.259 [Non-patent document 2] Watanabe, et al., "Study on Remote Optical Path Switching Node and Optical Cross-Connect Function in Multistage Loop Networks," Institute of Electronics, Information and Communication Engineers, IEICE Technical Report, Vol. 121, No. 332, OFT2021-62, January 2022, pp. 36-41 Summary of the Invention [Problem to be solved by the invention]

[0006] If the capacitors that serve as the power storage units in the optical node deteriorate due to aging or other reasons, they may be unable to supply sufficient power to the MPU (Micro Processor Unit), which may cause the optical node to become unable to operate. For example, if an electric double layer capacitor (EDLC (Electric Double Layer Capacitor)), which is a type of capacitor, deteriorates, the capacitance decreases and the internal resistance increases.

[0007] However, the management devices described in Non-Patent Documents 1 and 2 monitor only the voltage of the optical node capacitor, and are therefore unable to grasp the decrease in capacitance and the increase in internal resistance, making it difficult to correctly confirm the normality of the capacitor. In other words, since they lack the function to accurately grasp the normality of the optical node capacitor, there is a problem in that they are unable to grasp the deterioration of the capacitor in advance, and there is a possibility that the optical node cannot be operated.

[0008] The present disclosure has been made in consideration of the above circumstances, and an object of the present disclosure is to provide a determination device and a determination method that can estimate the aging of a power storage unit. [Means for solving the problem]

[0009] A determination device of one aspect of the present disclosure includes a processing unit that causes a specified device to execute a function that uses a certain amount of power consumption, calculates the current capacitance of the storage unit based on the certain amount of power consumption and each voltage value of the storage unit of the specified device before and after execution of the function, and determines the normality of the storage unit based on the difference between the current capacitance of the storage unit and the capacitance before use of the storage unit began.

[0010] A determination method according to one aspect of the present disclosure is a determination method performed by a determination device, in which a specified device is caused to execute a function that uses a certain amount of power consumption, the current capacitance of the storage unit is calculated based on the certain amount of power consumption and the voltage values ​​of the storage unit of the specified device before and after the execution of the function, and the normality of the storage unit is determined based on the difference between the current capacitance of the storage unit and the capacitance before the storage unit began to be used. [Effects of the Invention]

[0011] According to the present disclosure, it is possible to estimate the deterioration of the power storage unit over time. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a diagram showing the basic configuration of the system. [Figure 2] FIG. 2 is a diagram illustrating a functional block configuration of the management device. [Figure 3] FIG. 3 is a sequence diagram showing the operation of the system. [Figure 4] FIG. 4 is a diagram illustrating a hardware configuration of the determination device. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0014] [First embodiment] In the first embodiment, a system is disclosed that includes one or more optical nodes installed inside or outside a communication station, and a management device that is installed inside the communication station and manages the optical nodes. The management device has a normality determination function that determines the normality of a power storage unit (capacitor) included in the optical node in operations performed between the management device and the optical node.

[0015] 1 is a diagram showing the basic configuration of a system 1 according to a first embodiment. The system 1 includes a management device 10, a first optical node 20a, a second optical node 20b, a channel selector 30, a client device 40, a first OpS (Operation System) 50a, a second OpS 50b, an optical fiber network 60, a first optical fiber 70a, a second optical fiber 70b, and a communication network 80. Hereinafter, the first optical fiber 70a and the second optical fiber 70b will be collectively referred to as the optical fiber 70.

[0016] The management device 10 is installed in a communication station. The management device 10 is a device that manages a first optical node 20a and a second optical node 20b that are installed remotely. Hereinafter, the first optical node 20a and the second optical node 20b will be collectively referred to as optical nodes 20. The management device 10 includes a power supply control light source installed in a power supply environment such as a communication station, and has a function of simultaneously supplying optical power to each optical node 20 and controlling an optical switch included in each optical node 20 using power supply control light, which is a single laser from the power supply control light source.

[0017] The first optical node 20a is installed on an optical fiber network 60 inside or outside a communication station. The first optical node 20a is a device that receives a control signal superimposed on power supply control light from the management device 10 and controls devices such as an optical switch using the received control signal. For example, the first optical node 20a has a core line switching function using an optical switch of the optical cross-connect function included in the first optical node 20a, a function to acquire optical intensity measurement data using a port monitoring function, a function to transmit various data, and a function to manage and maintain itself.

[0018] The first optical node 20a also has the function of receiving optical power supply light superimposed on power supply control light from the management device 10, converting the received optical power supply light into electricity using a photoelectric conversion element, and storing the power obtained by this conversion in a power storage unit (capacitor). The power stored in the capacitor is supplied to a control unit and each device in the first optical node 20a. To prevent a drop in the voltage value of the supplied power, which would make it impossible to control or drive the control unit and each device, optical power is supplied to the first optical node 20a, and a constant amount of power is always stored in the capacitor.

[0019] The second optical node 20b is installed at a different position from the first optical node 20a on the optical fiber network 60 inside or outside the communication station. The second optical node 20b has the same configuration and functions as the first optical node 20a.

[0020] The channel selector 30 is a device that selects either the first optical node 20a or the second optical node 20b. The channel selector 30 may be disposed outside the management device 10 or inside the management device 10. The channel selector 30 may be connected to the management device 10 by an optical fiber or an electric cable.

[0021] The client device 40 is connected to the management device 10 via a data setting interface 90a. The client device 40 is a device for setting various data required for the system 1 in the management device 10.

[0022] The first OpS 50a is connected to the management device 10 via an interface 90b for OSS (Open Source Software) and a communication network 80. The first OpS 50a is an operation system for operating the first optical node 20a and the second optical node 20b.

[0023] The second OpS 50b is connected to the management device 10 via an interface 90b for OSS and a communication network 80. The second OpS 50b is an operation system for operating nodes other than the first optical node 20a and the second optical node 20b.

[0024] The optical fiber network 60 is an optical fiber network for communication and main signals.

[0025] The first optical fiber 70a is connected between the first optical node 20a and the channel selector 30. The first optical fiber 70a is an optical fiber for controlling and feeding power to the first optical node 20a.

[0026] The second optical fiber 70b is connected between the second optical node 20b and the channel selector 30. The second optical fiber 70b is an optical fiber for controlling and feeding power to the second optical node 20b.

[0027] The communication network 80 is a DCN (Data Communication Network).

[0028] Unlike existing network devices such as OLTs (Optical Line Terminals) and ONUs (Optical Network Units), the first optical node 20a and the second optical node 20b are charged with power from optical power feed from the management device 10. In other words, the first optical node 20a and the second optical node 20b do not receive commercial power from electric wires on utility poles. For example, communication between the management device 10 and each optical node 20 is serial communication at about several hundred bps.

[0029] That is, the system 1 includes one or more optical nodes 20, and a management device 10 connected to the optical nodes 20 by a fixed length of optical fiber 70. The management device 10 superimposes a control signal on optical power supply light emitted from a power supply control light source within the management device 10, and simultaneously supplies optical power to each optical node 20 and controls devices included in each optical node 20 using the power supply control light obtained by superimposing the optical power supply light and the control signal.

[0030] Each optical node 20 is connected to a power supply control light source in the management device 10 via an optical fiber 70. This optical fiber 70 is connected to a channel selector 30 and an optical switch installed in each optical node 20, and is remotely controlled by the management device 10. A power storage unit (capacitor) in each optical node 20 holds a voltage equal to or greater than the voltage value capable of driving devices such as optical switches and control units. Communication between each optical node 20 and the management device 10 is, for example, serial communication at approximately several hundred bps.

[0031] Next, a method for storing power in the first optical node 20a and the second optical node 20b will be described.

[0032] The optical power supply light output from the power supply control light source in the management device 10 is output sequentially to the first optical node 20a and the second optical node 20b. "Sequentially" means that the management device 10 changes the output destination of the optical power supply light by switching control of the channel selector 30. For example, the channel selector 30 outputs the optical power supply light to the first optical node 20a, and then changes the path to output the optical power supply light to the second optical node 20b. Then, each optical power supply light is accumulated in each capacitor of the first optical node 20a and the second optical node 20b. Note that in this embodiment, the number of optical nodes 20 is two, but this is not limited to two.

[0033] In this way, the management device 10 optically feeds power to the multiple optical nodes 20 one by one. Here, the management device 10 needs to keep the capacitors of the optical nodes 20 at a voltage value that can drive the control units and each device in the optical nodes 20. Furthermore, the management device 10 needs to operate commands in the optical nodes 20 while maintaining a voltage that is equal to or higher than the voltage that can drive the optical nodes 20.

[0034] As a method for checking such voltage values, it is necessary for the management device 10 to inquire about the current amount of stored power of each optical node 20, and for each optical node 20 to have a function of responding to the management device 10 about the current amount of stored power. By providing such a function, each optical node 20 can ensure that it has a certain amount of stored power or more.

[0035] Therefore, the management device 10 of this embodiment has a normality determination function that queries the optical node 20 for the current amount of stored power, and based on the response from the optical node 20 about the current amount of stored power, determines the normality of the capacitor of the optical node 20, which is the power supply to the control unit and each device within the optical node 20.

[0036] 2 is a diagram showing a functional block configuration of the management device 10. The management device 10 includes a power supply control light source 11 and a determination device 12.

[0037] The power supply control light source 11 is a light source that outputs power supply control light in which a control signal and optical power supply light are superimposed.

[0038] The determination device 12 includes a processing unit 121 , a storage unit 122 , and a memory unit 123 .

[0039] The processing unit 121 has a function of reading out the normality determination program from the storage unit 122 and executing the read normality determination program.

[0040] That is, the processing unit 121 has a function of making the optical node 20 execute function X, which consumes a certain amount of power, during management and maintenance of the optical node 20 in accordance with a normality determination program, calculating the current capacitance of the capacitor based on the certain amount of power consumption and the voltage values ​​of the capacitors of the optical node 20 before and after the execution of function X, and determining the normality of the capacitors based on the difference between the current capacitance of the capacitors of the optical node 20 and the capacitance before the start of use. Note that a control signal for making the optical node 20 execute function X is superimposed on the power supply control light.

[0041] The storage unit 122 has a function for storing a normality determination program. The normality determination program is a program that executes a function X whose power consumption takes a constant value, calculates the current capacitance of the capacitor from the voltage values ​​before and after the execution, and determines whether there is a deviation from the capacitance at the start of use, etc.

[0042] The storage unit 123 includes a database that readably stores various data calculated during execution of the normality determination program.

[0043] In this embodiment, if it is determined that the current capacitance of the capacitor of the optical node 20 does not deviate from the capacitance before use began (for example, the deviation value described below is within a specified value), the normality determination of the capacitor of the optical node 20 is considered to be complete and the processing is terminated, and if it is determined that there is a deviation (for example, the deviation value is not within a specified value), it is considered that there is an abnormality in the capacitor of the optical node 20 and it is determined that the capacitor needs to be replaced.

[0044] This point will be specifically explained using Table 1. Table 1 is an example of a database stored in storage unit 123.

[0045] [Table 1]

[0046] The time when the optical node 20 starts to be used or when it is shipped from the factory is set to t0. At time t0, the optical node 20 is inquired about the voltage value of the capacitor before and after the execution of function X, and the optical node 20 returns the voltage value V bo (V) and the voltage value after execution V a0 (V) is acquired and stored in the database. The power consumption U(J) of function X measured in advance is a constant value. At this time, equation (1) holds due to the relationship between the electrostatic energy of the capacitor.

[0047]

number

[0048] The capacitance C0 (F) of the capacitor at time t0 can be calculated from equation (2), which is a modification of equation (1).

[0049]

number

[0050] Next, the times at which the optical node 20 is subjected to periodic maintenance, etc., are represented as t1, . . . , t y y is a positive integer that increases in time series. y Even when the capacitance of the capacitor is C y can be calculated in the same way. Then, the deviation value Z (%) from the capacitance C0 at the start of use or at the time of shipment from the factory can be calculated using equation (3). The deviation value is calculated based on the capacitance C0 at the start of use or at the time of shipment from the factory, y The capacitance of the capacitor at y This indicates the degree of deviation from the capacitance C0 at the time of start of use or at the time of shipment from the factory.

[0051]

number

[0052] Capacitor degradation threshold Z th is normally about 20 to 30%, but since the optical node 20 is subject to planned maintenance, it may be possible to set it to a small value taking into account the period until the next planned maintenance.

[0053] Next, the operation of the determination device 12 of the management device 10 will be described.

[0054] FIG. 3 is a sequence diagram showing the operation of the system 1 including the management device 10. As shown in FIG.

[0055] First, the determination device 12 of the management device 10 determines whether the time t y At this time, the channel selector 30 selects the first optical node 20a, and the voltage value V of the capacitor is set to the selected first optical node 20a. by The first optical node 20a requests the capacitor voltage V by The determination device 12 of the management device 10 responds by determining the voltage value V of the capacitor of the first optical node 20a. by is stored in the database of the storage unit 123 (step S3).

[0056] Next, the determination device 12 of the management device 10 transmits an execution request for function X to the first optical node 20a (step S4). The first optical node 20a executes function X (step S5) and returns an execution completion response for function X (step S6).

[0057] Next, the determination device 12 of the management device 10 determines whether the voltage value V of the capacitor is set to the first optical node 20a selected by the channel selector 30. ay The first optical node 20a requests the capacitor voltage V ay The determination device 12 of the management device 10 responds by determining the voltage value V of the capacitor of the first optical node 20a. ay is stored in the database of the storage unit 123 (step S9).

[0058] Next, the management device 10 determines the voltage value V of the capacitor before and after the execution of the function X. by , V ay and the power consumption U of function X (constant value), at time t y The capacitance of the capacitor at y After that, the determination device 12 of the management device 10 calculates the y The capacitance of the capacitor at y and the capacitance C of the capacitor at the time t0 when it is first used or shipped from the factory o A deviation value Z from the above is calculated (step S10).

[0059] Finally, the determination device 12 of the management device 10 determines whether the calculated deviation value Z is equal to or smaller than the deviation value threshold value Z th It is determined whether the calculated deviation value Z is less than the deviation value threshold value Z (step S11). th If the calculated deviation value Z is less than the threshold value Z of the deviation value, the determining device 12 of the management device 10 determines that the capacitor of the first optical node 20a is normal (step S12). th If it is not less than 100%, the determining device 12 of the management device 10 determines that the capacitor of the first optical node 20a is abnormal and that the capacitor is to be replaced (step S13).

[0060] The determination device 12 of the management device 10 performs the same process for the capacitor of the second optical node 20b.

[0061] According to this embodiment, the management device 10 includes a determination device 12, and the determination device 12 has a processing unit 121 that causes the optical node 20 to execute function X, which consumes a certain amount of power, calculates the current capacitance of the capacitor of the optical node 20 based on the certain amount of power consumption and each voltage value of the capacitor of the optical node 20 before and after the execution of function X, and determines the normality of the capacitor of the optical node 20 based on the difference between the current capacitance of the capacitor and the capacitance before the start of use. This makes it possible to accurately determine the normality of the capacitor of the optical node 20, and to estimate the deterioration over time of the capacitor of the optical node 20. Because the deterioration state of the capacitor can be known in advance, it becomes possible to plan the timing of capacitor replacement, and it becomes possible to operate the optical network without stopping the optical node 20 for long periods of time.

[0062] [Second embodiment] In the first embodiment, the determination device 12 of the management device 10 executes a determination process to determine the normality of a capacitor of an optical node 20 once, and determines the normality of the capacitor based on the result of the one execution of the determination process.

[0063] In the second embodiment, the determining device 12 of the management device 10 executes the determination process for determining the normality of the capacitor of the optical node 20 multiple times, and determines the normality of the capacitor based on the results of the execution of the determination process multiple times.

[0064] For example, the determination device 12 of the management device 10 determines whether or not the time t y In this case, steps S1 to S13 are repeated three times, and if the abnormality determination result is three times in a row, the capacitor is determined to be abnormal. Alternatively, the determination device 12 of the management device 10 may determine that the capacitor is abnormal if the abnormality determination result is accumulated three times.

[0065] According to this embodiment, the determination device 12 executes a determination process for determining the normality of the capacitor of the optical node 20 multiple times, and determines the normality of the capacitor based on the results of the multiple executions of the determination process. Therefore, in addition to the effect of the first embodiment, it is possible to avoid erroneously determining that an abnormality other than a capacitor abnormality (for example, an abnormality in reading a voltage value) is a capacitor abnormality.

[0066] [Third embodiment] In the first embodiment, the case where the determination device 12 is provided in the management device 10 has been described.

[0067] In the third embodiment, the determination device 12 is provided in the optical node 20.

[0068] For example, the optical node 20 may be provided with a new device that functions as the determination device 12. Alternatively, the optical node 20 may be provided with a new device that executes function X (a device that uses the same power consumption as function X) that consumes a constant amount of power among the functions of the determination device 12, and may be provided with a function related to determination and the like other than function X as a program. Alternatively, the optical node 20 may be provided with a program that functions as the entire determination device 12.

[0069] For example, let us assume that the device that executes function X is an optical switch (a new optical switch that is not used in optical cross-connects). This optical switch executes function X, which consumes a constant amount of power when powered by a capacitor and switches fiber cores.

[0070] According to this embodiment, the optical node 20 is equipped with a determination device 12, and therefore, in addition to the effects of the first embodiment, instruction operations from the management device 10 are not required, and the normality of the capacitors of the optical node 20 can be accurately and quickly determined.

[0071] [Fourth embodiment] In the first embodiment, a case has been described in which a function X that consumes a certain amount of power is executed. That is, the certain amount of power is the power consumed by the normality determination function.

[0072] In the fourth embodiment, the certain power consumption is the power consumption consumed by a function provided in the optical node 20. The determination device 12 determines the normality of the capacitor of the optical node 20 based on the power consumption consumed by the function provided in the optical node 20 when the function is executed.

[0073] As explained above, the optical node 20 has a fiber switching function using an optical switch, a function for acquiring optical intensity measurement data using a port monitoring function, a function for transmitting various data, etc. Therefore, for example, the power consumption consumed by the fiber switching function is known in advance so that the power consumption itself can be used to determine normality.

[0074] In the first embodiment, if the frequency of periodic normality determination is set to twice a day, the determination device 12 executes the periodic maintenance function X twice a day. In the fourth embodiment, the power consumption consumed by the core line switching function itself is utilized in the normality determination process. Therefore, when an order for core line switching is received, the determination device 12 performs the core line switching and simultaneously measures the power consumption of the core line switching itself, and determines the normality of the capacitor based on the power consumption. Therefore, there is no need to perform periodic maintenance again at times other than core line switching.

[0075] In addition, if the power consumption of each function of the optical node 20, such as the port monitoring function to acquire optical intensity measurement data and the function to transmit various data to the management device 10, is known in advance, there will be more opportunities to substitute for regular maintenance, and regular maintenance can be omitted.

[0076] According to this embodiment, the certain power consumption is the power consumption consumed by the functions provided in the optical node 20, and the determination device 12 determines the normality of the capacitor of the optical node 20 based on the power consumption consumed by the functions provided in the optical node 20 when the functions are executed. Therefore, in addition to the effects of the first embodiment, the normality determination of the capacitor can be efficiently performed.

[0077] [Fifth embodiment] In the first embodiment, the case where the power consumption of function X is a constant value and does not change has been described.

[0078] In the fifth embodiment, it is assumed that the power consumption of the function X is to be changed, and the power consumption U of the function X stored in the database of the storage unit 123 is changed.

[0079] For example, as described in the third embodiment, consider a case where the optical node 20 includes a device that executes function X, which consumes a constant amount of power, among the functions of the determination device 12. When the device, whose power consumption is known, is updated from the original device, the power consumption U of function X in the database needs to be updated to the power consumption of the updated device.

[0080] When the installer of the optical node 20 notifies the operator of the system 1 that the device has been changed to the updated device, the operator of the system 1 changes the power consumption in the database using the first OpS 50a and the second OpS 50b. The determination device 12 changes the constant power consumption stored in the database of the storage unit 123 in response to the change in the device that executes the function X (change in the function whose power consumption takes a constant value).

[0081] According to this embodiment, the determination device 12 changes the constant power consumption stored in the database of the storage unit 123 in response to a change in the device that executes function X (a change in the function whose power consumption takes a constant value), and therefore, in addition to the effects of the first embodiment, the normality determination of the capacitor can be flexibly performed.

[0082] [others] The present disclosure is not limited to the above-described embodiments. The present disclosure can be modified in many ways within the scope of the present disclosure. The embodiments may be combined.

[0083] The determination device 12 is not limited to being located within the management device 10 or the optical node 20. The determination device 12 may be implemented in any device. The determination device 12 is applicable to any device equipped with a storage unit. The capacitor is merely an example of a storage unit. The function X can be anything as long as its power consumption is a constant value, and a new device is not necessarily required for normality determination. When utilizing the conventional functions of the optical node 20, the determination device 12 may be included in those conventional functions.

[0084] The determination device 12 of each embodiment may be realized by various devices that are hardware. As shown in Fig. 4, the determination device 12 may be realized using a general-purpose computer system including a CPU 901, a memory 902, a storage 903, a communication device 904, an input device 905, and an output device 906. The memory 902 and the storage 903 are storage devices. In the computer system, the CPU 901 executes a predetermined program loaded on the memory 902, thereby realizing each function of the determination device 12.

[0085] The determination device 12 may be implemented by one computer. The determination device 12 may be implemented by multiple computers. The determination device 12 may be a virtual machine implemented in a computer. The program for the determination device 12 may be stored in a computer-readable recording medium such as an HDD, SSD, USB memory, CD, or DVD. The computer-readable recording medium is, for example, a non-transitory recording medium. The program for the determination device 12 may also be distributed via a communication network.

[0086] The management device 10 can also be configured in the same manner as the hardware configuration shown in FIG. [Explanation of symbols]

[0087] 1 System 10 Management device 11 Power supply control light source 12 Judgment device 20a First optical node 20b Second Optical Node 30 Channel Selector 40 Client Device 50a 1st OpS 50b 2nd OpS 60 Optical Fiber Network 70a First optical fiber 70b Second optical fiber 80 Communication Network 90a Data setting interface 90b Interface for OSS 121 Processing section 122 Storage area 123 Storage section 901 CPU 902 memory 903 Storage 904 Communication equipment 905 Input Device 906 Output Device

Claims

1. a processing unit that causes a predetermined device to execute a function that consumes a certain amount of power, calculates a current capacitance of the power storage unit based on the certain amount of power consumption and each voltage value of the power storage unit of the predetermined device before and after the execution of the function, and determines the normality of the power storage unit based on a difference between the current capacitance of the power storage unit and the capacitance before the start of use of the power storage unit; A determination device comprising:

2. The processing unit The determination device according to claim 1 , wherein a determination process for determining the normality of the power storage unit is executed a plurality of times, and the normality of the power storage unit is determined based on a result of the execution of the determination process a plurality of times.

3. the predetermined device is an optical node that switches optical paths, The processing unit The determination device according to claim 1 , wherein the determination device determines the normality of a power storage unit of the optical node.

4. the certain power consumption is power consumption consumed by a function provided in the optical node, The processing unit The determination device according to claim 3 , wherein the normality of the power storage unit of the optical node is determined based on power consumption consumed by the function of the optical node when the function of the optical node is executed.

5. In the determination method performed by the determination device, a predetermined device is caused to execute a function that consumes a certain amount of power, a current capacitance of the power storage unit is calculated based on the certain amount of power consumption and each voltage value of the power storage unit of the predetermined device before and after the execution of the function, and the normality of the power storage unit is determined based on the difference between the current capacitance of the power storage unit and the capacitance before the start of use of the power storage unit; Judgment method.

Images