Remote control device, remote operation system, abnormality detection method, and program for realizing a computer as a remote control device

Abstract

The purpose of the present disclosure is to make it possible to detect an abnormality in an optical switch inside an optical node.　The present disclosure is a remote control device which is connected to an optical fiber network to which a plurality of optical nodes are connected and which performs an optical fiber network connection switch via remote operation by using an optical switch provided to the optical nodes, wherein: a plurality of optical switches provided to specific optical nodes among the plurality of optical nodes are each connected to a specific optical node; test light is transmitted to one of the plurality of optical switches; and a determination about whether or not there is an abnormality in any of the plurality of optical switches is made on the basis of whether or not the test light was successfully detected by the plurality of optical switches.

Description

[Technical Field]

[0001] The present disclosure relates to a technique for detecting an abnormality in an optical switch within an optical node in an optical fiber network in which optical nodes are connected to one another. [Background technology]

[0002] In optical fiber networks in which optical nodes are interconnected, particularly in access networks that connect communication devices installed in communication buildings with user-side communication terminals, connection switching, such as connecting optical fibers to arbitrary routes or changing routes, is performed at a certain frequency in order to efficiently use the facilities during installation and maintenance. Normally, such work is performed by visiting the site and manually switching the optical fiber connections, but a technology has been proposed for remotely controlling the optical fiber connection switching (see, for example, Non-Patent Document 1).

[0003] Non-Patent Document 1 is equipped with an optical port monitoring function that detects part of the optical signal passing through the optical switch. However, Non-Patent Document 1 cannot detect abnormalities in the optical switch inside the optical node. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 2021 IEICE Society Conference, BK-2-3, 2021 Summary of the Invention [Problem to be solved by the invention]

[0005] The present disclosure aims to make it possible to detect abnormalities in optical switches inside optical nodes. [Means for solving the problem]

[0006] The remote control system of the present disclosure includes a remote control device of the present disclosure and a plurality of optical nodes connected to the optical fiber network and using power supply light from the remote control device to switch the connections of a plurality of optical switches provided in the device itself.

[0007] The remote control device executes the anomaly detection method of the present disclosure. The abnormality detection method of the present disclosure is an abnormality detection method executed by a remote control device of the present disclosure, a plurality of optical switches provided in a specific optical node are connected to the specific optical node among the plurality of optical nodes; transmitting test light to one of the plurality of optical switches; The presence or absence of an abnormality in the plurality of optical switches is determined based on whether the test light is detected in the plurality of optical switches.

[0008] The remote control device includes: causing the specific optical node to change one of the plurality of optical switches to another optical switch that is connectable to the same one path as the plurality of optical switches, thereby putting the plurality of optical switches into a new connection state; transmitting a test light to one of the plurality of optical switches in a newly connected state; It may be determined that there is an abnormality in one of the plurality of optical switches based on whether the test light is detected in the plurality of optical switches.

[0009] The remote control device may repeat the process of changing the plurality of optical switches to a new connection state a predetermined number of times, and if the test light cannot be detected in any of the connection states, determine that there is an abnormality in the specific optical node.

[0010] The remote control system of the present disclosure comprises: connection information between optical nodes in the optical fiber network; Connection information between optical switches provided in the optical nodes; Whether the optical switch provided in the optical node is normal or abnormal; A server that manages The remote control device may connect a plurality of optical switches provided in the specific optical node to each other by referring to the server, and determine whether or not there is an abnormality in any one of the plurality of optical switches.

[0011] The plurality of optical nodes include: an optical cross-connect unit that switches the connection of the optical fiber network using an optical switch; an optical monitoring function unit that detects a portion of light passing through the optical cross-connect unit; a remote control unit that controls the optical cross-connect unit based on a control signal from the remote control unit and transmits a detection result from the optical monitoring function unit to the remote control unit; Equipped with The remote control device may use the detection result from the remote control unit provided in the specific optical node to determine whether the test light has been detected in the specific optical node.

[0012] The above disclosures can be combined as much as possible. [Effects of the Invention]

[0013] According to the present disclosure, it is possible to detect an abnormality in an optical switch inside an optical node. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a system configuration example showing an example of a remote control system. [Figure 2] 1 is a diagram illustrating an example of the configuration of an optical node. [Figure 3] 1 is a configuration example of an optical cross-connect. [Figure 4] FIG. 10 is a flow chart illustrating an example of an abnormality detection method executed by the remote control device. [Figure 5] FIG. 10 is an explanatory diagram of a method for detecting an abnormality. [Figure 6] FIG. 10 is an explanatory diagram of a method for isolating an abnormality location. [Figure 7] FIG. 10 is an explanatory diagram of a method for isolating an abnormality location. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the embodiments shown below. These implementation examples are merely illustrative, and the present disclosure can be implemented in various forms with various modifications and improvements based on the knowledge of those skilled in the art. Note that components with the same reference numerals in this specification and drawings indicate the same components.

[0016] 1 shows an example of the configuration of a remote control system that remotely switches optical fiber connections. The remote control system of the present disclosure includes a remote control device 93 installed in an environment with power, such as a communications building, and one or more optical nodes 91-1, 91-2, and 91-3 that are remotely located.

[0017] FIG. 1 shows an example in which an optical fiber network is an access network connecting optical nodes installed in a communications building with user-side communications terminals, the optical access network having a multistage loop configuration consisting of multiple loops, and an optical communication signal is transmitted from the optical node installed in the communications building to a user-side base station 96. In such an optical fiber network, an optical node 91 is installed at a location where adjacent loops connect. A remote control device 93 also functions as an optical node installed in an environment with a power source. Although the figure shows an example in which only three optical nodes are used, the number of optical nodes can be any number greater than or equal to two. Hereinafter, when there is no need to distinguish between optical nodes 91-1, 91-2, and 91-3, they will be referred to as optical node 91.

[0018] The remote control device 93 can simultaneously realize the functions of optically feeding power to multiple optical nodes 91 using a single light source and controlling multiple optical switches included in each optical node 91. It also performs mutual connection and switching on an optical fiber basis. The optical nodes 91 are installed in an optical fiber network and perform mutual connection and switching on an optical fiber basis.

[0019] A server 94 is installed in the communications building and manages mutual connection information of optical fibers 92 between multiple optical nodes 91. This server 94 also manages information such as optical cables in the optical fiber network and optical fiber numbers between multiple optical nodes 91, which is provided in cooperation with other systems. The server 94 also manages connection information between internal optical switches used by the optical nodes 91. Connection information between optical switches is, for example, the connection status between ports provided in the optical switches. The server 94 also manages the normal or abnormal status of all optical switches in each optical node 91 installed in the optical fiber network.

[0020] The remote control device 93 exchanges data in cooperation with a server 94 and controls optical nodes 91 installed in the optical fiber network. For example, the remote control device 93 sets up an optical fiber route between the communication building and base station 96 shown in Fig. 1 and connects them. However, if the connection cannot be made, an alternative route can be set up from an unused port of the optical node 91 and a connection can be made via that alternative route.

[0021] Also, a test optical transmitter 95 may be installed that emits test light of a specific wavelength and can check the optical intensity during transmission. In this case, the test optical transmitter 95 makes it possible to insert test light into any optical fiber that has switched optical nodes within the optical fiber network that passes through the telecommunications building.

[0022] An example of the functional configuration of an optical node is shown in Figure 2. Optical node 91 includes an optical port monitoring function unit 11 that functions as an optical monitoring function unit that detects a portion of transmitted light, an optical cross-connect unit 12 that switches the optical fiber connections, and a remote control unit 13 that controls these from a remote control device 93 installed in a communications building. Remote control unit 13 is a function unit that controls optical cross-connect unit 12 based on control signals from remote control device 93.

[0023] The optical cross-connect unit 12 is switched using optical power supply and control signals from a remote control device 93 installed in a communications building. Communication light and test light from the remote control device 93 pass through the input optical port 14, optical port monitoring unit 11, optical cross-connect unit 12, optical port monitoring unit 11, and output optical port 14, in that order. The two optical port monitoring units 11 detect any part of light passing through the optical port 14, such as communication light or test light, and measure its optical intensity. The remote control unit 13 stores the detected optical intensity value as data in a control signal and transmits it to the remote control device 93. Note that the optical fiber for this remote control may be a control optical fiber separate from the communication optical fiber in the optical fiber network.

[0024] Fig. 3 shows an example of the functional configuration of the optical cross-connect unit. The optical cross-connect unit 12 can be configured by combining optical switches 122 each having 1xn channels (n is an integer). Fig. 3 shows two 1x6 optical switches 122 arranged for each of four routes D1 to D4 in the optical node 91-1, and the four routes D1 to D4 are connected in two 4 This is a configuration in which different routes are optically connected to each other using a cross-connect, and by switching the output channels of the two 1x6 optical switches 122, optical connections can be made via alternative routes.

[0025] The numbers written on each optical switch 122 indicate port numbers. For example, the six ports on the output side of port number #1 are indicated as 1-1 to 1-6. The same applies to the other six ports, port numbers #2 to #8. In the present disclosure, port numbers #1 and #2 are connected to path D1, port numbers #3 and #4 are connected to path D2, port numbers #5 and #6 are connected to path D3, and port numbers #7 and #8 are connected to path D4.

[0026] The optical node 91 is equipped with a certain number of optical switches 122, and switching is performed by remote control from a remote control device 93, but if an abnormality occurs, the optical switches 122 may not switch normally. However, currently, there is no method or system for detecting an abnormality that has occurred in the optical switches 122 from the remote control device 93.

[0027] Here, this optical node 91 is structured to be powered by a minute amount of power supply light, but because it is required to operate with low power consumption, it is desirable not to include new sensors for detecting abnormalities. From the perspective of power saving, a method and system that uses the functions provided in the current optical node 91 to detect abnormalities is desirable. Furthermore, this optical node 91 is expected to be installed in a wide range of locations within the optical fiber network, including in places where immediate repair is not possible even if a malfunction occurs, such as inside manholes in underground sections. For this reason, it is desirable to be able to temporarily operate using an alternative route by setting up an alternative route.

[0028] When optical node switching work related to optical connection occurs, the remote control device 93 detects an abnormality in an optical switch, isolates the abnormal optical switch, and opens an alternative route, and the remote control system of the present disclosure performs this process based on the flow shown in Fig. 4. As a result, the remote control system of the present disclosure not only detects an abnormality but also makes it possible to identify the location of the failure in the optical switch 122 using the optical port monitoring function unit 11, which is a function already provided in the optical node 91.

[0029] Specifically, when optical node switching work related to optical connection occurs, the remote control device 93 executes the following steps S101 to S111. Anomalies are detected in steps S101 to S105, and the anomalies are isolated in steps S106 to S110. An example in which the specific optical node to be detected is optical node 91-1 will be described below with reference to FIGS. 5 to 7.

[0030] In step S101, the remote control device 93 issues a switching instruction to a specific optical node 91-1 in the optical fiber network so as to connect the remote control device 93, which functions as an optical node in a communication building, to the optical node 91-1. This connects the remote control device 93 to the optical node 91-1. In this embodiment, the optical switch 122#1 of the optical node 91-1 is connected to the remote control device 93.

[0031] In step S102, the remote control device 93 instructs the optical node 91-1 to switch one optical switch. For example, the remote control device 93 instructs the optical switch 122#1 of port #1 of the optical node 91-1 to switch the connection between port #1 and port #1-6. As a result, port #1 and port #1-6 are connected as shown in FIG. 5.

[0032] In step S103, the remote control device 93 instructs the optical node 91-1 to switch one optical switch. For example, the remote control device 93 instructs the optical switch 122#5 of port #5 of the optical node 91-1 to switch the connection between port #5 and port #5-1. As a result, port #5 and port #5-1 are connected as shown in FIG. 5.

[0033] In step S104, the remote control device 93 transmits test light to the optical fiber connected to the switched optical switch 122#1 from the test light transmitter 95. The remote control device 93 also instructs the optical node 91-1 to measure the optical intensity in the optical port monitoring function unit 11.

[0034] In step S105, the remote control device 93 controls the optical port monitoring unit 11 of the optical node 91-1 to measure the optical intensity. In this embodiment, the optical port monitoring unit 11 of the optical node 91-1 measures the optical intensity of the test light at port #1 and port #5. The remote control device 93 acquires the optical intensity measured by the optical port monitoring unit 11 via the remote control unit 13 of the optical node.

[0035] In this embodiment, port #1-6 and port #5-1 are connected. Therefore, port #1 and port #5 are connected by steps S102 and S103. Port #1 is also located on the upper loop side. Therefore, if the connection is normal, the test light passes from port #1 to port #5, and the optical intensity of the test light is measured by the optical port monitoring function units 11 of ports #1 and #5. Therefore, based on the optical intensity measured by the optical port monitoring function units 11 of ports #1 and #5 (normal in S105), the remote control device 93 determines whether or not there is an abnormality in the optical switches 122#1 and 122#5, and thereby can confirm that the switching has been completed normally. In this case, the switching of the optical node 91-1 is completed.

[0036] If port #1 and port #5 are not connected properly, the light intensity of the test light cannot be measured at port #5. In this case, the remote control device 93 determines that an abnormality has occurred (abnormal in S105).

[0037] In this way, the present disclosure connects ports within the optical node 91 (S102 and S103) and measures the optical intensity in the optical port monitoring function unit 11 (S104 and S105), thereby making it possible to determine abnormalities such as a failure to make a connection at the optical cross-connect 12 within the optical node 91-1.

[0038] It is necessary to isolate the fault, and port #1 and port #5 must be isolated. Therefore, to confirm the location of the abnormality, switch to another available port on an alternative route that can be connected to the same path and check. Note that the following assumes that the same path, such as port #2 or port #6, is available.

[0039] In step S106, the remote control device 93 in the communication building determines an alternative route for optical fiber connection. For example, port #2 is connected to path D1 of port #1, and port #6 is connected to path D3 of port #5. Therefore, the remote control device 93 determines port #2 connected to path D1 as the alternative route for optical fiber connection.

[0040] In step S107, the remote control device 93 switches the optical fiber connected to port #1 of the optical node 91-1 to port #2.

[0041] In step S108, a switching instruction is issued to the optical node of the optical node 91-1 in question. For example, as shown in FIG. 6, the remote control device 93 switches the optical fiber used for connecting to the upstream side of the optical node 91-1 from port #1 to port #2. Then, the remote control device 93 issues an instruction to switch the core lines of the two optical switches 122#2 and 122#5 at the optical node 91-1 so that one path is switched to another available port. For example, the remote control device 93 instructs the optical switch 122#2 of the optical node 91-1 in question to switch the connection between port #2 and port #2-6. The remote control device 93 also instructs the optical switch 122#5 of port #5 of the optical node 91-1 to switch the connection between port #5 and port #5-3.

[0042] In step S109, test light is transmitted from the test light transmitter 95 to the optical fiber connected to the switched optical switch 122#2. An instruction is given to the optical node 91-1 to measure the optical intensity in the optical port monitoring function unit 11.

[0043] In step S110, the optical port monitoring unit 11 of the optical node 91-1 measures the optical intensity. In this embodiment, the optical port monitoring unit 11 of the optical node 91-1 measures the optical intensity of the test light at ports #2 and #5. The remote control device 93 acquires the optical intensity measured by the optical port monitoring unit 11 via the remote control unit 13 of the optical node 91-1.

[0044] In this embodiment, port #2-6 and port #5-3 are connected. Therefore, port #2 and port #5 are connected in steps S107 and S108. Port #2 is located on the upper loop side. Therefore, if everything is normal, the test light will exit from port #2 to port #5, and the optical intensity of the test light will be measured by the optical port monitoring function units 11 of port #2 and port #5 (normal in step S110). In this case, the remote control device 93 can confirm that switching has been completed normally based on the fact that the test light has been detected by the optical port monitoring function units 11 of port #2 and port #5. Furthermore, based on this result, the optical switch 122#1 of port #1 is determined to be faulty.

[0045] In step S111, the optical switch 122#1 of port #1 determined to be abnormal by the optical node 91-1 is determined to be abnormal by the server 94 and is not used thereafter. As a result, switching of the optical node 91-1 is completed using an alternative route using ports #2 and #5. Note that the optical switch 122#1 determined to be faulty will be repaired as soon as possible (this will be handled as part of planned maintenance).

[0046] On the other hand, if the optical port monitoring function unit 11 of port #5 cannot measure the optical intensity of the test light, it is assumed that the optical switch 122#5 of port #5 may be faulty, that the optical switches 122#1 and 122#2 of ports #1 and #2 may both be faulty, or that all of the optical switches 122#1, 122#2, and 122#5 of ports #1, #2, and #5 may be faulty. Therefore, the remote control device 93 determines that an abnormality has occurred (abnormal in S110). In this case, steps S106 to S110 are repeated again. For example, the following operations are subsequently performed.

[0047] The remote control device 93 switches the optical fiber used by the optical node 91-1 in question from port #2 to port #1 (S108). Next, an attempt is made to connect port #1 as port #6, which is an alternative route for port #5 of the optical node 91-1 in question (S108). Specifically, as shown in FIG. 7, the remote control device 93 instructs the optical switch 122#1 of port #1 of the optical node 91-1 in question to switch the connection to port #1-3. Similarly, it instructs the optical switch 122#6 of port #6 of the optical node 91-1 to switch the connection to port #6-1. Port #1-3 and port #6-1 are connected. As a result, port #1 and port #6 are connected.

[0048] Next, the test light is transmitted from the test light transmitter 95 to the optical fiber in the optical fiber network to which port #1 of the optical node 91-1 is connected from the communication building side (S109). Subsequently, the optical port monitoring function unit 11 of the optical node 91-1 checks the test light transmitted to ports #1 and #6 (S110).

[0049] If everything is normal, the test light will exit from port #1 to port #6, and the test light will be confirmed by the optical port monitoring function unit 11 of port #1 and port #6. In this case, it can be confirmed that the switching has been completed normally. Furthermore, based on this result, the optical switch 122#5 of port #5 is determined to be faulty, and from then on, the optical switch 122#5 of port #5 will not be used in operations. The affected optical switch 122#5 will be repaired as soon as possible (this will be handled as part of planned maintenance).

[0050] On the other hand, if the test light cannot be detected by the optical port monitoring function unit 11 of port #6, multiple optical switches 122 will be determined to be faulty as follows. That is, it is possible that both the optical switches of port #5 and port #6 are faulty, that both the optical switches of port #1 and port #2 are faulty, that three of the optical switches 122 of port #1, port #2, port #5, and port #6 are faulty, or that all of the optical switches 122 of port #1, port #2, port #5, and port #6 are faulty. In this way, the present disclosure can determine which optical switches 122 are likely to be abnormal among the optical switches 122 used in the optical node 91-1.

[0051] Thereafter, in order to check for an abnormal optical switch 122, switching is performed one by one to an unused port on the same path, the optical port monitoring function unit 11 measures the optical intensity, and the switching continues until the remote control device 93 can no longer detect an abnormality. However, if there is no unused port (no alternative route in step S106), switching becomes impossible. In this case, the remote control device 93 determines that the switching of the optical node 91-1 in question is incomplete and that the optical node 91-1 needs to be repaired.

[0052] It is preferable that the optical node 91 is operated in a power-saving manner. Therefore, instead of continuing to change the alternative route as long as an alternative route is available, an upper limit may be set on the number of changes. In this way, if switching is performed a certain number of times or more and abnormalities are confirmed in multiple optical switches 122 simultaneously, the alternative route is not changed, and the optical switch 122 of the optical node 91-1 in question is immediately repaired. This has the effect of reducing the power consumption of the optical node 91-1.

[0053] As described above, the present disclosure uses the remote control device 93 to enable real-time detection from a telecommunications building of an abnormality, such as a connection failure, in the optical cross-connect 12 inside the optical node. Furthermore, the present disclosure can switch a faulty port to an adjacent port using the remote control device 93. Therefore, the present disclosure can respond to an optical switch failure without dispatching a worker to the faulty optical node for repairs.

[0054] The remote control device 93 of the present invention can also be realized by a computer and a program, and the program can be recorded on a recording medium or provided via a network. The program of the present disclosure is a program for causing a computer to realize each functional unit of the remote control device 93 according to the present disclosure, and is a program for causing a computer to execute each step of the method executed by the remote control device 93 according to the present disclosure. [Explanation of symbols]

[0055] 11: Optical port monitoring function unit 12: Optical cross connect 13: Remote control unit 14: Optical port 91, 91-1, 91-2, 91-3: Optical nodes 92: Optical fiber 93: Remote control device 94: Server 95: Test optical transmitter 96:Base station 122: Optical switch

Claims

1. A remote control device connected to an optical fiber network in which a plurality of optical nodes are connected to each other, the remote control device remotely controlling connection switching of the optical fiber network using an optical switch provided in the optical node, a plurality of optical switches provided in a specific optical node are connected to the specific optical node among the plurality of optical nodes; transmitting test light to one of the plurality of optical switches; determining whether or not there is an abnormality in the plurality of optical switches based on whether or not the test light has been detected in the plurality of optical switches; If an abnormality is detected in the determination, the connections of the plurality of optical switches provided in the specific optical node are switched sequentially, and the optical switch having the abnormality is determined. Remote control device.

2. A remote control device connected to an optical fiber network in which a plurality of optical nodes are connected to each other, the remote control device remotely controlling connection switching of the optical fiber network using an optical switch provided in the optical node, a plurality of optical switches provided in a specific optical node are connected to the specific optical node among the plurality of optical nodes; transmits test light to one of the plurality of optical switches, and if the test light can be detected by both of the plurality of optical switches, determines that there is no abnormality in any of the plurality of optical switches; when the test light cannot be detected by the other of the plurality of optical switches, changing one of the plurality of optical switches to another optical switch that is provided in the specific optical node, is different from the plurality of optical switches, and is connectable to the same one path as the plurality of optical switches, thereby putting the plurality of optical switches into a new connection state; transmits test light to the other optical switch in the new connection state, and when the test light can be detected by both the other optical switch and the other of the plurality of optical switches connected to each other, determines that one of the plurality of optical switches used before switching to the new connection state is abnormal; Remote control device.

3. Repeating the setting of the plurality of optical switches to a new connection state a predetermined number of times; If the test light cannot be detected in any connection state, it is determined that there is an abnormality in the specific optical node. The remote control device according to claim 2 .

4. A remote control device according to any one of claims 1 to 3; a plurality of optical nodes connected to the optical fiber network, each of which switches the connection of a plurality of optical switches provided in the optical nodes by using the power supply light from the remote control device; A remote control system comprising:

5. connection information between optical nodes in the optical fiber network; Connection information between optical switches provided in the optical nodes; Whether the optical switch provided in the optical node is normal or abnormal; A server for managing the the remote control device connects a plurality of optical switches provided in the specific optical node to each other by referring to the server, and determines whether or not there is an abnormality in any one of the plurality of optical switches. The remote control system according to claim 4.

6. The plurality of optical nodes include: an optical cross-connect unit that switches the connection of the optical fiber network using an optical switch; an optical monitoring function unit that detects a portion of light passing through the optical cross-connect unit; a remote control unit that controls the optical cross-connect unit based on a control signal from the remote control unit and transmits a detection result from the optical monitoring function unit to the remote control unit; Equipped with the remote control device determines whether the test light has been detected in the specific optical node using the detection result from the remote control unit provided in the specific optical node; The remote control system according to claim 4.

7. 1. An abnormality detection method executed by a remote control device that is connected to an optical fiber network in which a plurality of optical nodes are connected to each other and that remotely switches connections in the optical fiber network using optical switches provided in the optical nodes, comprising: a plurality of optical switches provided in a specific optical node are connected to the specific optical node among the plurality of optical nodes; transmitting test light to one of the plurality of optical switches; determining whether or not there is an abnormality in the plurality of optical switches based on whether or not the test light has been detected in the plurality of optical switches; If an abnormality is detected in the determination, the connections of the plurality of optical switches provided in the specific optical node are switched sequentially, and the optical switch having the abnormality is determined. Anomaly detection methods.

8. 1. An abnormality detection method executed by a remote control device that is connected to an optical fiber network in which a plurality of optical nodes are connected to each other and that remotely switches connections in the optical fiber network using optical switches provided in the optical nodes, comprising: a plurality of optical switches provided in a specific optical node are connected to the specific optical node among the plurality of optical nodes; transmits test light to one of the plurality of optical switches, and if the test light can be detected by both of the plurality of optical switches, determines that there is no abnormality in any of the plurality of optical switches; when the test light cannot be detected by the other of the plurality of optical switches, changing one of the plurality of optical switches to another optical switch that is provided in the specific optical node, is different from the plurality of optical switches, and is connectable to the same one path as the plurality of optical switches, thereby putting the plurality of optical switches into a new connection state; transmits test light to the other optical switch in the new connection state, and when the test light can be detected by both the other optical switch and the other of the plurality of optical switches connected to each other, determines that one of the plurality of optical switches used before switching to the new connection state is abnormal; Anomaly detection methods.

9. A program for causing a computer to function as the remote control device according to any one of claims 1 to 3.

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