WO2017013919A1 - Dispositif relais, système de communication optique et procédé de commutation de redondance - Google Patents

Dispositif relais, système de communication optique et procédé de commutation de redondance Download PDF

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Publication number
WO2017013919A1
WO2017013919A1 PCT/JP2016/063061 JP2016063061W WO2017013919A1 WO 2017013919 A1 WO2017013919 A1 WO 2017013919A1 JP 2016063061 W JP2016063061 W JP 2016063061W WO 2017013919 A1 WO2017013919 A1 WO 2017013919A1
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WIPO (PCT)
Prior art keywords
port
optical communication
optical
switching
ports
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PCT/JP2016/063061
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English (en)
Japanese (ja)
Inventor
敬一 辻本
泰弘 佐野
裕嵩 武藤
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住友電気工業株式会社
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Publication of WO2017013919A1 publication Critical patent/WO2017013919A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/03—Arrangements for fault recovery
    • H04B10/032—Arrangements for fault recovery using working and protection systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/29—Repeaters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/44—Star or tree networks

Definitions

  • the present invention relates to a relay device, an optical communication system, and a redundancy switching method, and more particularly, to a relay device, an optical communication system, and a redundancy switching method including a plurality of optical communication ports.
  • system redundancy is essential to provide high-quality services.
  • a highly reliable system can be provided by using a duplex system.
  • the redundant system a redundant configuration is adopted in which each of the devices, components, and network has an active system and a standby system as required. When a failure occurs in a part of the operating system, it is possible to make the system stop time due to the failure as short as possible by performing redundant switching from the active system to the standby system.
  • Patent Document 1 discloses the following network relay device. That is, in the network relay devices 1 and 2, the ports 1a to 1f and the ports 2a to 2f are connected by a plurality of physical lines 4 to 14. Of these, the two physical lines 4 and 6 constitute a logically bundled LAG (Link Aggregation Group) 1, and the other two physical lines 10 and 12 constitute a LAG 2. Physical lines 8 and 14 not belonging to LAG 1 and 2 are defined as standby lines. When a failure occurs in a physical line (normal line) in any one of LAGs 1 and 2, the LAG is reconfigured by changing one of the standby lines to a normal line, and the failed line becomes a new standby line. .
  • LAG Link Aggregation Group
  • Each of the network relay devices described in Patent Document 1 includes six ports, and the six ports of each network relay device are connected by six physical lines as a redundant configuration. In other words, in the redundant configuration described in Patent Document 1, the same number of ports are required in each network relay device.
  • the number of ports of the device increases, for example, manufacturing costs and maintenance costs will increase. For this reason, it is preferable that the number of ports in the redundant configuration is small.
  • the present invention has been made to solve the above-described problem, and an object of the present invention is to provide a repeater and an optical communication capable of favorably realizing redundant switching of optical communication ports while suppressing the number of optical communication ports.
  • a system and redundant switching method is provided.
  • a relay device is a relay device that can be connected to an optical fiber branched into three or more by an optical branching unit, and connects the optical fiber.
  • an optical communication system includes an optical branching unit and a relay device connectable to an optical fiber branched into three or more by the optical branching unit.
  • the relay device includes three or more optical communication ports to which the optical fiber can be connected, and the relay device further uses any one of the optical communication ports as an operation port.
  • a port switching unit that performs a switching process for switching the operation port to another optical communication port in the state, and the port switching unit is the optical communication port used as the operation port in the switching process
  • the switching destination optical communication port is selected from a plurality of candidate ports that are different optical communication ports, and each of the optical communication ports is connected to the optical branching port.
  • a fiber optic optical communications port connectable being connected to one of the optical communication ports in other devices.
  • a redundant switching method can be connected to an optical fiber branched into three or more by an optical branching unit, and the optical fiber can be connected 3
  • a redundancy switching method in a relay apparatus including one or more optical communication ports, the step of using any one of the optical communication ports as an operation port, and the operation port as another optical communication port Performing a switching process for switching, and in the step of performing the switching process, a switching destination is selected from a plurality of candidate ports that are optical communication ports different from the optical communication port used as the operation port. The optical communication port is selected.
  • the present invention can be realized not only as a relay device including such a characteristic processing unit but also as a program for causing a computer to execute such characteristic processing steps. Further, the present invention can be realized as a semiconductor integrated circuit that realizes part or all of the relay device.
  • FIG. 1 is a diagram showing a configuration of an optical communication system according to an embodiment of the present invention.
  • FIG. 2 is a diagram showing the configuration of the relay apparatus according to the embodiment of the present invention.
  • FIG. 3 is a diagram illustrating an example of a redundant switching operation performed by the relay device according to the embodiment of the present invention.
  • FIG. 4 is a diagram illustrating an example of a life expectancy table in the relay device according to the embodiment of the present invention.
  • FIG. 5 is a diagram showing an example of an average life table in the relay device according to the embodiment of the present invention.
  • FIG. 6 is a flowchart that defines an example of an operation procedure when the monitoring unit in the relay apparatus according to the embodiment of the present invention creates or updates the life expectancy table.
  • FIG. 1 is a diagram showing a configuration of an optical communication system according to an embodiment of the present invention.
  • FIG. 2 is a diagram showing the configuration of the relay apparatus according to the embodiment of the present invention.
  • FIG. 3 is a diagram illustrating
  • FIG. 7 is a flowchart that defines an example of an operation procedure when the monitoring unit in the relay apparatus according to the embodiment of the present invention updates the life expectancy column in the life expectancy table.
  • FIG. 8 is a diagram showing an example of the reception availability table in the relay apparatus according to the embodiment of the present invention.
  • FIG. 9 is a flowchart defining an example of an operation procedure when the monitoring unit in the relay apparatus according to the embodiment of the present invention updates the reception availability table.
  • FIG. 10 is a flowchart defining another example of an operation procedure when the monitoring unit in the relay apparatus according to the embodiment of the present invention updates the reception availability table.
  • FIG. 11 is a flowchart defining an example of an operation procedure when the port switching unit in the relay apparatus according to the embodiment of the present invention performs the switching process.
  • FIG. 12 is a diagram showing an example of a priority table in the relay device according to the embodiment of the present invention.
  • FIG. 13 is a diagram illustrating a configuration of a modified example of the relay device according to the embodiment of the present invention.
  • FIG. 14 is a flowchart defining an example of an operation procedure when the operation information acquisition unit in the relay device according to the embodiment of the present invention creates or updates the priority table.
  • FIG. 15 is a flowchart defining another example of an operation procedure when the port switching unit in the relay apparatus according to the embodiment of the present invention performs the switching process.
  • FIG. 16 is a flowchart defining another example of the operation procedure when the port switching unit in the relay apparatus according to the embodiment of the present invention performs the switching process.
  • a repeater according to an embodiment of the present invention is a repeater that can be connected to an optical fiber branched into three or more by an optical branching unit, and has three or more lights that can connect the optical fiber.
  • a communication port and a port switching unit that performs a switching process for switching the operation port to another optical communication port in a state where any one of the optical communication ports is used as an operation port; In the switching process, the port switching unit selects the switching destination optical communication port from among a plurality of candidate ports that are the optical communication ports different from the optical communication port used as the operation port.
  • an optical branching unit that joins paths from a plurality of optical communication ports reserved for a redundant configuration to one optical communication port in the opposite device that is a communication destination device using an optical signal is provided.
  • the number of optical communication ports in the opposite apparatus can be reduced from the number of optical communication ports in the relay apparatus. That is, the number of communication ports for redundant configuration can be reduced.
  • a new operation port can be automatically selected from the candidate ports in the switching process. As a result, port switching can be performed without delay when an event such as an abnormality occurs.
  • the port switching unit checks whether each candidate port is usable, and selects the switching destination from the usable candidate ports.
  • the port switching unit confirms whether the candidate port can receive light, and selects the switching destination from the candidate ports that can receive light.
  • the light receiving unit of the candidate port is operated so that it is possible to determine in advance whether or not the optical signal can be received. It can be excluded in advance. In other words, it is possible to narrow down the selection targets to optical communication ports that have a high possibility of link-up in advance and prevent the occurrence of re-switching processing.
  • the link up confirmation process can be shortened. Therefore, an increase in time required for selecting an operation port can be suppressed, and the switching process can be performed quickly.
  • the port switching unit acquires life expectancy information related to the life expectancy of each candidate port, and selects the switching destination based on the acquired life expectancy information.
  • each optical communication port can be ascertained, so the use of optical communication ports with a high degree of deterioration is avoided, and optical communication ports with a relatively low degree of deterioration are selected as operation ports. be able to. As a result, the possibility of failure of the operation port after redundancy switching can be reduced. Further, when a plurality of operation ports are used in the relay device, the possibility of failure of each operation port can be made more uniform.
  • the port switching unit selects the switching destination based on a priority given in advance to each candidate port when the remaining life of each candidate port does not satisfy a predetermined condition. .
  • the priority of the optical communication port can be increased, and the use of the relay device can be continued while keeping the maintenance cost low.
  • an increase in cost can be effectively suppressed.
  • the priority of the optical communication port which is a product of a manufacturer that is empirically hard to break, can be increased, and the use of the relay device for a longer period of time can be realized.
  • An optical communication system includes an optical branching unit and a relay device connectable to an optical fiber branched into three or more by the optical branching unit, Including three or more optical communication ports to which the optical fiber can be connected, and the relay device further includes the operation port in a state where any one of the optical communication ports is used as an operation port.
  • a port switching unit that performs a switching process for switching to another optical communication port, wherein the port switching unit is the optical communication port that is different from the optical communication port used as the operation port in the switching process.
  • the switching destination optical communication port is selected from among a plurality of candidate ports, and each optical communication port is connected to an optical fiber via the optical branching unit.
  • a possible optical communication ports is connected to one of the optical communication ports in other devices.
  • an optical branching unit that joins paths from a plurality of optical communication ports reserved for a redundant configuration to one optical communication port in the opposite device that is a communication destination device using an optical signal is provided.
  • the number of optical communication ports in the opposite apparatus can be reduced from the number of optical communication ports in the relay apparatus. That is, the number of communication ports for redundant configuration can be reduced.
  • a new operation port can be automatically selected from the candidate ports in the switching process. As a result, port switching can be performed without delay when an event such as an abnormality occurs.
  • the redundant switching method according to the embodiment of the present invention is connectable to three or more optical fibers branched by an optical branching unit, and includes three or more optical communication ports to which the optical fibers can be connected.
  • a redundant switching method in a relay apparatus comprising: a step of using any one of the optical communication ports as an operation port; and a switching process of switching the operation port to another optical communication port; In the step of performing the switching process, the switching destination optical communication port is selected from a plurality of candidate ports that are the optical communication ports different from the optical communication port used as the operation port. .
  • an optical branching unit that joins paths from a plurality of optical communication ports reserved for a redundant configuration to one optical communication port in a counter device that is a communication destination device using an optical signal.
  • the number of optical communication ports in the apparatus can be reduced from the number of optical communication ports in the relay apparatus. That is, the number of communication ports for redundant configuration can be reduced.
  • a new operation port can be automatically selected from the candidate ports in the switching process. As a result, port switching can be performed without delay when an event such as an abnormality occurs.
  • FIG. 1 is a diagram showing a configuration of an optical communication system according to an embodiment of the present invention.
  • an optical communication system 301 includes a plurality of ONUs (Optical Network Units) 202, an OLT (Optical Line Terminal) 121, a repeater 101, optical branching units 141A and 141B, opposing devices 151A, 151B.
  • the relay apparatus 101 includes a plurality of optical communication ports 2.
  • the opposing device 151A includes an optical communication port 152A.
  • Opposing device 151B includes an optical communication port 152B.
  • the OLT 121 and the relay apparatus 101 are accommodated in the same housing, for example.
  • each of the optical branching portions 141A and 141B is also referred to as an optical branching portion 141.
  • Each of the facing devices 151A and 151B is also referred to as a facing device 151.
  • Each of the optical communication ports 152A and 152B is also referred to as an optical communication port 152.
  • two opposing devices 151 are representatively shown, but three or more or one opposing device 151 may be provided.
  • a plurality of ONUs 202 are representatively shown, one ONU 202 may be provided.
  • one OLT 121 is representatively shown, a plurality of OLTs 121 may be provided.
  • two optical branching portions 141A and 141B are representatively shown, three or more or one optical branching portion 141 may be provided.
  • the optical branching portions 141A and 141B are, for example, optical couplers, and are connected between the relay device 101 and the opposing devices 151A and 151B via optical fibers, respectively. That is, the optical branching unit 141A and the opposing device 151A are connected via an optical fiber. The optical branching unit 141B and the opposing device 151B are connected via an optical fiber. The optical branching units 141A and 141B are connected to the relay apparatus 101 via optical fibers.
  • a PON Passive Optical Network
  • the OLT 121 is connected to the plurality of ONUs 202 via, for example, an optical coupler and an optical fiber.
  • the ONU 202 and the OLT 121 transmit and receive optical signals to and from each other via, for example, an optical coupler and an optical fiber.
  • the direction from the ONU 202 to the opposing device 151 is referred to as an upward direction, and the direction from the opposing device 151 to the ONU is referred to as a downward direction.
  • the OLT 121 transmits or receives a frame with the ONU 202.
  • the OLT 121 transmits / receives an optical signal including a frame to / from each ONU 202 via a common communication line, that is, a PON line.
  • This frame includes, for example, an IP packet.
  • the OLT 121 converts the upstream optical signal received from the ONU 202 into an electrical signal, and transmits a frame included in the converted electrical signal to the relay apparatus 101.
  • the relay apparatus 101 converts a frame that is an electrical signal received from the OLT 121 into an upstream optical signal, and transmits the upstream optical signal to the opposite apparatus 151 via the optical branching unit 141 and the optical fiber.
  • the relay apparatus 101 transmits the frame to the opposite apparatus 151A or 151B according to the destination of the frame received from the OLT 121, for example.
  • the relay apparatus 101 converts the downstream optical signal received from the opposite apparatus 151 via the optical branching unit 141 and the optical fiber into an electrical signal, and transmits a frame included in the converted electrical signal to the OLT 121.
  • the OLT 121 converts a frame, which is an electrical signal received from the relay apparatus 101, into a downstream optical signal and transmits it to the ONU 202.
  • a plurality of optical communication ports 2 in the relay device 101 are connected to one optical communication port 152 of the opposite device 151 via one optical branching unit 141.
  • the plurality of optical communication ports 2 are optical communication ports to which optical fibers can be connected via the optical branching unit 141 and are connected to one optical communication port in the opposite device 151, that is, the optical communication port 152. Yes.
  • one of the plurality of optical communication ports 2 is used as an operation port, and the remaining ports are closed as standby ports, for example, that is, the optical signal transmission / reception operation is stopped.
  • the relay apparatus 101 can be connected to an optical fiber branched into three or more by the optical branching unit 141. More specifically, the relay apparatus 101 can be connected to two sets of three or more optical fibers branched by each of the optical branching units 141A and 141B.
  • the relay apparatus 101 includes six or more optical communication ports 2 that can connect each set of optical fibers. Specifically, for example, the relay apparatus 101 includes eight optical communication ports 2 that can connect each set of optical fibers, that is, two sets of four optical communication ports 2. One optical communication port 2 is used as an operation port for each group.
  • a plurality of optical communication ports 2 are connected to the same optical communication port 152 for transmitting and receiving an optical signal in the opposite apparatus 151 via a corresponding optical branching unit 141.
  • the relay apparatus 101 selects any one of the plurality of optical communication ports 2, transmits an optical signal including a frame from the operation port that is the selected optical communication port 2 to the optical branching unit 141, and is not selected.
  • the optical output from the optical communication port 2 is stopped.
  • the relay apparatus 101 monitors its own state, changes the operation port to another optical communication port 2 based on the monitoring result, and starts optical output of the optical communication port 2 after the change.
  • the optical signal transmitted from the operation port is transmitted to the standby optical communication port by the configuration in which the optical signal is transmitted from the operation port to the optical branching unit 141 and the optical output from the standby optical communication port 2 is stopped. It can be prevented from being influenced by the light output of 2.
  • FIG. 2 is a diagram showing the configuration of the relay apparatus according to the embodiment of the present invention.
  • the relay device 101 includes port units 15 ⁇ / b> A and 15 ⁇ / b> B, a port switching unit 11, a monitoring unit 12, a switch unit 13, and a storage unit 14.
  • the port unit 15A includes optical communication ports 2A, 2B, 2C, and 2D that are optical communication ports 2.
  • the port unit 15B includes optical communication ports 2E, 2F, 2G, and 2H that are optical communication ports 2.
  • each of the port portions 15A and 15B is also referred to as a port portion 15.
  • Each of the optical communication ports 2A to 2H is also referred to as an optical communication port 2.
  • optical communication ports 2 are provided for one optical branching unit 141 in the relay apparatus 101 as an example, but three or more optical communications are performed for one optical branching unit 141. It is sufficient if port 2 is provided.
  • Each optical communication port 2 in the port unit 15A is connected to the optical branching unit 141A via an optical fiber.
  • Each optical communication port 2 in the port unit 15B is connected to the optical branching unit 141B via an optical fiber.
  • the optical communication port 2 includes, for example, an optical link module according to the SFP + (Small Form-factor Pluggable +) standard.
  • the optical communication port 2 converts the frame, which is an electrical signal received from the switch unit 13, into an upstream optical signal and transmits it to the corresponding optical branching unit 141.
  • the optical communication port 2 converts the downstream optical signal received from the corresponding optical branching unit 141 into an electrical signal and outputs the electrical signal to the switch unit 13.
  • the port switching unit 11 sets any one of the optical communication ports 2 in the port unit 15 as an operation port and sets the other optical communication ports 2 as standby ports.
  • Each optical communication port 2 set as a standby port stops an optical signal transmission operation, and the optical communication port 2 set as an operation port performs an optical signal transmission operation. With such a configuration, it is possible to prevent the optical signals from the respective optical communication ports 2 from colliding in the corresponding optical branching unit 141.
  • the switch unit 13 transmits a frame included in the electrical signal received from the optical communication port 2 to the OLT 121.
  • the switch unit 13 In the upstream direction, the switch unit 13 outputs the frame received from the OLT 121 to the operation port in the port unit 15A or 15B according to the destination of the frame.
  • the storage unit 14 stores transfer information indicating a correspondence relationship between the frame destination and the port unit 15.
  • the switch unit 13 distributes the frame to each port unit 15 by referring to the transfer information in the storage unit 14.
  • the monitoring unit 12 includes link down of the operation port, disconnection of the optical fiber, abnormality of the optical link module, removal of the optical link module, removal of the optical fiber, adhesion of dust due to reinsertion of the optical link module or the optical fiber, and optical fiber. Is detected, and the port switching unit 11 is notified of the detection result.
  • the port switching unit 11 performs switching processing for switching the operation port to another optical communication port 2 in a state where any one of the optical communication ports 2 is used as an operation port in each of the port units 15A and 15B. To do.
  • the port switching unit 11 performs a switching process based on the notification content from the monitoring unit 12, for example.
  • the port switching unit 11 selects a switching destination optical communication port 2 from among a plurality of candidate ports, that is, standby ports, which are optical communication ports 2 different from the optical communication port 2 used as an operation port. .
  • the port switching unit 11 can identify candidate ports corresponding to the operation ports of the port units 15A and 15B from among the optical communication ports 2, and can select from among a plurality of corresponding candidate ports. Select the switch destination.
  • the storage unit 14 stores port information indicating the operation port and the port numbers of the other optical communication ports 2 for each port unit 15.
  • the port number indicates an insertion position in the port portion 15.
  • the port switching unit 11 recognizes the operation port and the candidate port in each port unit 15, performs a switching process, and updates the port information.
  • FIG. 3 is a diagram showing an example of the redundant switching operation performed by the relay device according to the embodiment of the present invention.
  • relay apparatus 101 is, for example, optical communication port 2 that uses the highest optical communication port 2 among the four optical communication ports 2 in port unit 15, that is, the third port position.
  • Port 3 is set as an operation port, and ports 1, 2, and 4, which are optical communication ports 2 using the other port positions 1, 2, and 4, are set as standby ports.
  • the order of the ports 1 to 4 that are selected as operation ports is 2, 3, 1, and 4, respectively.
  • the relay apparatus 101 switches the operation port from the port 3 to the next highest port 1.
  • the relay apparatus 101 can continue to transmit and receive optical signals to and from the opposite apparatus 151 using port 1 which is a new operation port.
  • the redundancy switching target in the relay apparatus 101 is, for example, automatic recovery, agile recovery, and normal operation in the optical communication system 301 is not affected.
  • the inventors of the present application have newly found such a target, and have come up with a configuration for satisfying the target, that is, the configuration of the relay apparatus 101.
  • the port switching unit 11 acquires life expectancy information regarding the life expectancy of each candidate port, and selects a switching destination in the switching process based on the acquired life expectancy information.
  • the port switching unit 11 acquires a life expectancy table from the storage unit 14 as life expectancy information.
  • FIG. 4 is a diagram illustrating an example of a life expectancy table in the relay device according to the embodiment of the present invention.
  • the life expectancy table is information indicating a correspondence relationship between the serial number of the optical link module, the used port number indicating the insertion position in the port unit 15, the operation time, the average life, and the life expectancy. is there.
  • the optical link module inserted at the third position in the port unit 15 has a serial number of 1234, an operation time of 3 k hours, that is, 3000 hours, and an average life of 6 k hours.
  • the optical link module inserted in the 4th position has a serial number of 2345, an operation time of 2k hours, an average life of 8k hours, and a life expectancy of 6k hours.
  • the optical link module inserted at the second position has a serial number of 3456, an operation time of 1 k hours, an average life of 10 k hours, and a life expectancy of 9 k hours.
  • the optical link module inserted in the first position has a serial number of 4567, an operation time of 4 k hours, an average life of 5 k hours, and a life expectancy of 1 k hours.
  • FIG. 5 is a diagram showing an example of an average life table in the relay device according to the embodiment of the present invention.
  • the average life table is information indicating the correspondence between the model number and the average life of the optical link module.
  • the average life of the optical link module with the model number AAA is 6 k hours
  • the average life of the optical link module with the model number BBB is 8 k hours.
  • model number entries are representatively shown, but one type or three or more types of model numbers and corresponding average lifetimes may be registered in the average life table.
  • the relay apparatus 101 includes a computer, and an arithmetic processing unit such as a CPU in the computer reads and executes a program including a part or all of each step of the following flowchart from a memory (not shown).
  • the program of this apparatus can be installed from the outside.
  • the program of this device is distributed in a state stored in a recording medium.
  • FIG. 6 is a flowchart defining an example of an operation procedure when the monitoring unit in the relay device according to the embodiment of the present invention creates or updates the life expectancy table.
  • monitoring unit 12 reads the serial number and model number of the inserted optical link module. (Step S2).
  • the monitoring unit 12 refers to the life expectancy table in the storage unit 14, and when an optical link module having the same number as the confirmed serial number exists in the life expectancy table (YES in step S3), the existing entry in the life expectancy table Edit. Specifically, for example, one of numbers 1 to 4 is entered in the column of used port number corresponding to the serial number (step S4).
  • the monitoring unit 12 adds a new entry to the life expectancy table (step S5).
  • the monitoring unit 12 refers to the average life table in the storage unit 14, confirms the average life corresponding to the confirmed model number in the average life table, and registers the confirmed average life, specifically, a new entry Is entered in the column of average life at (step S6).
  • FIG. 7 is a flowchart defining an example of an operation procedure when the monitoring unit in the relay apparatus according to the embodiment of the present invention updates the life expectancy column in the life expectancy table.
  • monitoring unit 12 waits until a predetermined time elapses (NO in step S11).
  • a predetermined time elapses
  • the life expectancy table in the storage unit 14 is referred to and it is confirmed whether or not the optical link module is continuously inserted at each port position in the port unit 15 (step S12). .
  • the monitoring unit 12 determines, for example, the corresponding operating time in the life expectancy table as described above. A value obtained by integrating the predetermined time is updated as a new operation time.
  • the life of a light receiving element for reception is sufficiently longer than the life of a light emitting element for transmission, and the light emitting element is more fragile than the light receiving element.
  • the monitoring unit 12 recalculates the corresponding life expectancy in the life expectancy table using the updated operating time, and updates it as a new life expectancy (step S15).
  • the monitoring unit 12 waits until a predetermined time elapses (NO in step S11).
  • the monitoring unit 12 deletes the port number of the optical link module in the life expectancy table (step S16).
  • the monitoring unit 12 performs, for example, the operation shown in FIG. 7 for all the optical link modules whose values are entered in the used port number column in the life expectancy table.
  • the port switching unit 11 confirms whether each candidate port is usable, and selects a switching destination in the switching process from the usable candidate ports.
  • the port switching unit 11 confirms whether or not the candidate port can receive light using, for example, a reception availability table, and selects a switching destination in the switching process from the candidate ports that can receive light.
  • the monitoring unit 12 monitors the port unit 15 and manages the reception availability table in the storage unit 14 based on the monitoring result.
  • FIG. 8 is a diagram showing an example of a reception availability table in the relay apparatus according to the embodiment of the present invention.
  • the reception availability table is information indicating whether or not the optical link module inserted at each port position in the port unit 15 can receive an optical signal.
  • the optical link module inserted in the position of the ports 1, 2, and 4 in the port unit 15 is in a state in which an optical signal can be received.
  • any one of these optical link modules One corresponds to the operation port.
  • the optical link module inserted at the port 3 position in the port unit 15 is in a state where it cannot receive an optical signal.
  • the optical communication port 2 in a state in which an optical signal can be received is also referred to as a receivable port
  • the optical communication port 2 in a state in which an optical signal cannot be received is also referred to as a non-receivable port.
  • FIG. 9 is a flowchart defining an example of an operation procedure when the monitoring unit in the relay apparatus according to the embodiment of the present invention updates the reception availability table.
  • FIG. 9 shows an operation of monitoring the optical link module with the light receiving unit of the optical link module always in an operating state.
  • monitoring unit 12 waits until a predetermined time elapses (NO in step S21), and when the predetermined time elapses (YES in step S21), the optical link module in port unit 15 Check if the signal can be received. Specifically, the monitoring unit 12 performs confirmation by accessing, for example, a register indicating the presence or absence of light reception in the optical link module (step S22).
  • the monitoring unit 12 When the monitoring unit 12 confirms that the optical link module can receive an optical signal (YES in step S22), the monitoring unit 12 enters “OK” in the reception availability column of the corresponding port number in the reception availability table. (Step S23).
  • the monitoring unit 12 confirms that the optical link module is not capable of receiving an optical signal (NO in step S22), it enters “NG” in the reception availability column of the corresponding port number in the reception availability table. (Step S24).
  • the monitoring unit 12 waits until the next predetermined time elapses (NO in step S21).
  • the monitoring unit 12 performs the operation shown in FIG. 9 for all the ports in the port unit 15, for example.
  • FIG. 10 is a flowchart defining another example of an operation procedure when the monitoring unit in the relay apparatus according to the embodiment of the present invention updates the reception availability table.
  • FIG. 10 shows an operation of activating and monitoring the light receiving unit of the optical link module corresponding to the candidate port at the timing when the reception availability table should be updated.
  • monitoring unit 12 waits until a predetermined time elapses (NO in step S31).
  • a predetermined time elapses YES in step S31
  • light reception of the optical link module in port unit 15 is performed.
  • the unit is operated (step S32), and it is confirmed whether or not the optical link module can receive the optical signal.
  • the monitoring unit 12 performs confirmation by accessing, for example, a register indicating the presence or absence of light reception in the optical link module (step S33).
  • the monitoring unit 12 When the monitoring unit 12 confirms that the optical link module can receive the optical signal (YES in step S33), the monitoring unit 12 enters “OK” in the reception availability column of the corresponding port number in the reception availability table. (Step S34).
  • the monitoring unit 12 confirms that the optical link module is not capable of receiving an optical signal (NO in step S33)
  • the monitoring unit 12 enters “NG” in the reception availability column of the corresponding port number in the reception availability table. (Step S35).
  • the monitoring unit 12 stops the operation of the light receiving unit of the optical link module (step S36), and then waits until a predetermined time elapses (NO in step S31).
  • the monitoring unit 12 performs, for example, the operation shown in FIG. 10 for all candidate ports in the port unit 15.
  • FIG. 11 is a flowchart that defines an example of an operation procedure when the port switching unit in the relay apparatus according to the embodiment of the present invention performs the switching process.
  • the port switching unit 11 waits until receiving a notification from the monitoring unit 12 that an operational port abnormality has been detected (NO in step S41), and indicates that an operational port abnormality has been detected.
  • the notification is received from the monitoring unit 12 (YES in step S41)
  • the reception permission / non-permission table in the storage unit 14 is referred to and the unreceivable port is excluded from the selection targets of the new operation port.
  • the port switching unit 11 excludes the optical communication port 2 corresponding to the port 3 in a state where the optical signal cannot be received from the selection target (step S42).
  • the port switching unit 11 refers to the life expectancy table in the storage unit 14 and selects the optical communication port 2 having a long life expectancy from the receivable ports. More specifically, the port switching unit 11 starts an optical signal transmission operation alternatively and sequentially from the optical communication port 2 having the longest remaining life, that is, the optical link module, and establishes communication connection with the corresponding counter device 151. For example, the optical communication port 2 that has been linked up is selected (step S43). Specifically, for example, when an optical signal from the relay device 101 is received by the opposite device 151 and an optical signal from the opposite device 151 is received by the relay device 101, the link up occurs.
  • the port switching unit 11 sets the selected optical communication port 2 as a new operation port (step S44).
  • the operation of the optical link module is performed as shown in FIG.
  • the product life requirement of “10 years” can be easily exceeded.
  • the port switching unit 11 is configured to acquire life expectancy information related to the life expectancy of each candidate port and select a switching destination based on the acquired life expectancy information.
  • the port switching unit 11 may be configured to select a switching destination based on a priority given in advance to each candidate port.
  • the port switching unit 11 acquires a priority table from the storage unit 14 as priority information.
  • FIG. 12 is a diagram showing an example of a priority table in the relay device according to the embodiment of the present invention.
  • the priority table is information indicating the priority of the optical link module inserted at each port position in the port unit 15.
  • priorities of 4, 3, 2, and 1 are given to the optical link modules inserted at the positions of the ports 1, 2, 3, and 4 in the port unit 15, respectively.
  • FIG. 13 is a diagram illustrating a configuration of a modified example of the relay device according to the embodiment of the present invention.
  • the modified example of relay device 101 further includes an operation information acquisition unit 16 compared to relay device 101 shown in FIG. 2.
  • the operation information acquisition unit 16 acquires operation information indicating the content of the priority assignment operation by the user, creates a priority table based on the acquired operation information, and stores the priority table in the storage unit 14 or stores the storage unit 14. Update the priority table at.
  • the operation information acquisition unit 16 may include an operation unit such as a touch panel, or may acquire the operation information from another device.
  • FIG. 14 is a flowchart defining an example of an operation procedure when the operation information acquisition unit in the relay device according to the embodiment of the present invention creates or updates the priority table.
  • the operation information acquisition unit 16 first acquires operation information indicating the content of the priority setting operation (step S51).
  • the operation information acquisition unit 16 creates or updates a priority table based on the acquired operation information (step S52).
  • FIG. 15 is a flowchart defining another example of an operation procedure when the port switching unit in the relay apparatus according to the embodiment of the present invention performs the switching process.
  • steps S61 and S62 are the same as the operations in steps S41 and S42 in the flowchart shown in FIG.
  • the port switching unit 11 refers to the priority table in the storage unit 14 and selects the optical communication port 2 having a higher priority from the receivable ports. More specifically, the port switching unit 11 starts the optical signal transmission operation alternatively and sequentially from the optical communication port 2 having the highest priority, that is, the optical link module, and communicates with the corresponding opposite device 151.
  • the optical communication port 2 that has established the connection, for example, that has been linked up, is selected (step S63).
  • the port switching unit 11 sets the selected optical communication port 2 as a new operation port (step S64).
  • the port switching unit 11 is not limited to the configuration using the priority table as shown in FIG. 12, but may be configured to use a table in which a priority column is added to the average life table shown in FIG. As a result, it becomes possible to clarify which optical link module of the model number is preferentially selected.
  • the port switching unit 11 may further be configured to select the optical communication port 2 by combining the life expectancy and priority of the optical link module.
  • FIG. 16 is a flowchart defining another example of an operation procedure when the port switching unit in the relay apparatus according to the embodiment of the present invention performs the switching process.
  • the port switching unit 11 selects a switching destination in the switching process based on the priority given in advance to each candidate port.
  • steps S71 and S72 are the same as the operations in steps S41 and S42 in the flowchart shown in FIG.
  • the port switching unit 11 refers to the life expectancy table in the storage unit 14, and determines whether or not there is a receivable port in the receivable port where the life expectancy satisfies a predetermined condition, for example, the life expectancy is equal to or greater than a predetermined threshold. Is confirmed (step S73).
  • the port switching unit 11 When there is a receivable port having a life expectancy equal to or greater than a predetermined threshold (YES in step S73), the port switching unit 11 refers to the life expectancy table in the storage unit 14 and selects light having a long life expectancy from the receivable ports. Select communication port 2. More specifically, the port switching unit 11 starts an optical signal transmission operation alternatively and sequentially from the optical communication port 2 having the longest remaining life, that is, the optical link module, and establishes communication connection with the corresponding counter device 151. For example, the optical communication port 2 that has been linked up is selected (step S74).
  • the port switching unit 11 refers to the priority table in the storage unit 14 and determines the priority from the receivable ports.
  • a high optical communication port 2 is selected. More specifically, the port switching unit 11 starts the optical signal transmission operation alternatively and sequentially from the optical communication port 2 having the highest priority, that is, the optical link module, and communicates with the corresponding opposite device 151.
  • the optical communication port 2 that has established the connection, for example, that has been linked up, is selected (step S75).
  • the port switching unit 11 sets the selected optical communication port 2 as a new operation port (step S76).
  • the port switching unit 11 in the relay apparatus arbitrarily performs part or all of each method relating to the selection of the optical communication port 2 as described above, for example, as shown in FIG. It is possible to combine them.
  • the port switching unit 11 can arbitrarily change the priority order of each selection criterion of the operation port. Specifically, for example, the port switching unit 11 selects an optical communication port 2 having a long remaining life as an operation port from among the optical communication ports 2 having given priority levels 1 to 3.
  • the monitoring unit 12 detects an abnormality in each optical communication port 2, and the port switching unit 11 performs a switching process based on the detection result of the abnormality by the monitoring unit 12.
  • the present invention is not limited to this.
  • the monitoring unit 12 detects any event such as an abnormality of each optical communication port 2 as well as an abnormality of each optical communication port 2, and the port switching unit 11 performs a switching process based on the event detection result of the monitoring unit 12. Any configuration may be used.
  • the monitoring unit 12 creates a reception availability table, and the port switching unit 11 selects an optical communication port 2 having a long life expectancy from the reception enabled ports.
  • the present invention is not limited to this.
  • the monitoring unit 12 does not create a reception availability table, and the port switching unit 11 may simply select an optical communication port 2 having a long life expectancy as an operation port from among the candidate ports.
  • the monitoring unit 12 creates a life expectancy table indicating the life expectancy time of the optical communication port 2, and the port switching unit 11 selects the life expectancy time from the receivable ports.
  • the monitoring unit 12 creates a life expectancy table indicating the ratio of the operating time to the average life expectancy of the optical communication port 2, and the port switching unit 11 selects the optical communication port 2 having a small proportion from the receivable ports as the operation port.
  • the configuration may be selected as
  • the optical communication port 2 can be selected by combining the ratio and priority of the optical link module as follows. That is, the port switching unit 11 checks whether there is an optical communication port 2 whose operating time does not exceed 80% of the average life among the receivable ports. The optical communication port 2 with the highest priority is selected from among them.
  • optical communication port 2 when there is no optical communication port 2 whose operating time does not exceed 80% of the average life among the ports that can receive, there is an optical communication port 2 whose operating time does not exceed the average life. If it exists, the optical communication port 2 having the highest priority is selected from the optical communication ports 2.
  • the port switching unit 11 selects the optical communication port 2 having the highest priority from the receivable ports when there is no optical communication port 2 whose operating time does not exceed the average lifetime among the receivable ports. .
  • the opposing device is configured to include one optical communication port 152 commonly connected to the plurality of optical communication ports 2 in the port unit 15 of the relay device 101. It is not limited.
  • the opposing device 151 may be configured to include a plurality of optical communication ports 152. That is, a configuration including a plurality of optical communication ports 152 provided corresponding to the plurality of optical branching units 141 may be employed.
  • each of the network relay devices described in Patent Document 1 has six ports, and the six ports of each network relay device are connected by six physical lines as a redundant configuration.
  • the redundant configuration described in Patent Document 1 the same number of ports are required in each network relay device. Increasing the number of ports in the device increases, for example, manufacturing costs and maintenance costs. For this reason, it is preferable that the number of ports in the redundant configuration is small.
  • the relay apparatus 101 can be connected to an optical fiber branched into three or more by the optical branching unit 141.
  • the relay apparatus 101 includes three or more optical communication ports 2 to which optical fibers can be connected.
  • the port switching unit 11 performs a switching process for switching the operation port to another optical communication port 2 in a state where any one of the optical communication ports 2 is used as the operation port. Then, in the switching process, the port switching unit 11 selects the switching destination optical communication port 2 from among a plurality of candidate ports that are optical communication ports 2 different from the optical communication port 2 used as the operation port.
  • an optical branching unit that joins routes from a plurality of optical communication ports 2 secured for a redundant configuration to one optical communication port 152 in the opposite device 151 that is a communication destination device using an optical signal.
  • the number of optical communication ports 152 in the opposite apparatus 151 can be reduced from the number of optical communication ports 2 in the relay apparatus 101. That is, the number of communication ports for redundant configuration can be reduced.
  • a new operation port can be automatically selected from the candidate ports in the switching process.
  • port switching can be performed without delay when an event such as an abnormality occurs. That is, in a redundant configuration of one-to-many optical communication ports, port switching can be performed without delay when a problem occurs in the operation port on the multiport side.
  • the port switching unit 11 confirms whether each candidate port is usable, and selects a switching destination from the usable candidate ports.
  • the port switching unit 11 confirms whether or not the candidate port can receive light, and selects a switching destination from the candidate ports that can receive light.
  • the light receiving unit of the candidate port is operated so that it is possible to determine in advance whether or not the optical signal can be received. It can be excluded in advance. That is, it is possible to narrow down the selection target to the optical communication port 2 that is highly likely to be linked up, and to prevent the switching process from occurring again.
  • the link up confirmation process can be shortened. An increase in time required for selection can be suppressed, and the switching process can be performed quickly.
  • the port switching unit 11 acquires the life expectancy information regarding the life expectancy of each candidate port, and selects the switching destination based on the acquired life expectancy information.
  • each optical communication port 2 can be ascertained, so the use of the optical communication port 2 with a high degree of deterioration is avoided, and the optical communication port 2 with a relatively low degree of deterioration is used as the operation port. Can be elected as. As a result, the possibility of failure of the operation port after redundancy switching can be reduced. Further, when a plurality of operation ports are used in the relay apparatus 101, the possibility of occurrence of a failure in each operation port can be made more uniform.
  • the port switching unit 11 switches based on the priority given in advance to each candidate port when the remaining life of each candidate port does not satisfy the predetermined condition. Select the destination.
  • the relay apparatus 101 when the relay apparatus 101 has been used for a long time and the life expectancy of each candidate port is short, it is cheaper or available than the relatively expensive optical communication port 2 having a long life expectancy.
  • the priority of the easy optical communication port 2 can be increased, and the use of the relay device 101 can be continued while keeping the maintenance cost low.
  • an increase in cost can be effectively suppressed.
  • the priority of the optical communication port 2 which is a product of a manufacturer that is empirically hard to break, can be increased, and the relay device 101 can be used for a longer period of time.
  • the redundant switching method according to the embodiment of the present invention can be connected to three or more optical fibers branched by the optical branching unit 141, and the three or more optical communication ports 2 to which the optical fibers can be connected are connected.
  • This is a redundancy switching method in the relay apparatus 101 provided.
  • the redundancy switching method first, any one of the optical communication ports 2 is used as an operation port. Next, a switching process for switching the operation port to another optical communication port 2 is performed. In the switching process, the switching destination optical communication port 2 is selected from a plurality of candidate ports that are optical communication ports 2 different from the optical communication port 2 used as the operation port.
  • the optical branching unit 141 joins the paths from the plurality of optical communication ports 2 secured for the redundant configuration to one optical communication port 152 in the opposite device 151 that is a communication destination device using an optical signal.
  • the number of optical communication ports 152 in the opposite apparatus 151 can be reduced from the number of optical communication ports 2 in the relay apparatus 101. That is, the number of communication ports for redundant configuration can be reduced.
  • a new operation port can be automatically selected from the candidate ports in the switching process.
  • port switching can be performed without delay when an event such as an abnormality occurs. That is, in a redundant configuration of one-to-many optical communication ports, port switching can be performed without delay when a problem occurs in the operation port on the multiport side.
  • a relay device connectable to an optical fiber branched into three or more by an optical branching unit, Three or more optical communication ports to which the optical fiber can be connected;
  • a port switching unit that performs a switching process for switching the operation port to another optical communication port in a state where any one of the optical communication ports is used as an operation port;
  • the port switching unit selects the switching destination optical communication port from among a plurality of candidate ports that are the optical communication ports different from the optical communication port used as the operation port in the switching process,
  • the relay device can be connected to a plurality of sets of three or more optical fibers branched by each of a plurality of optical branching units, Comprising six or more optical communication ports to which each of the sets of optical fibers can be connected;
  • One optical communication port for each group is used as the operation port,
  • the port switching unit is capable of identifying the candidate port corresponding to each operational port from the optical communication ports, and selecting the switching destination from a plurality of corresponding candidate ports.
  • An optical branch A relay device connectable to the optical fiber branched into three or more by the optical branching unit,
  • the relay device includes three or more optical communication ports to which the optical fiber can be connected,
  • the relay device further includes: A port switching unit that performs a switching process for switching the operation port to another optical communication port in a state where any one of the optical communication ports is used as an operation port;
  • the port switching unit selects the switching destination optical communication port from among a plurality of candidate ports that are the optical communication ports different from the optical communication port used as the operation port in the switching process,
  • Each optical communication port is an optical communication port to which an optical fiber can be connected via the optical branching unit, and is connected to one optical communication port in another device,
  • the relay apparatus can be connected to a plurality of sets of three or more optical fibers branched by each of a plurality of optical branching units, and the six or more optical communication ports that can connect the optical fibers of each set. With One optical communication port for each group is used as the operation port, The port switching unit
  • Optical communication port 11 port switching unit, 12 monitoring unit, 13 switch unit, 14 storage unit, 15, 15A, 15B port unit, 16 operation information acquisition unit, 101 relay device, 121 OLT, 141, 141A , 141B optical branching unit, 151, 151A, 151B opposing device, 152, 152A, 152B optical communication port, 202 ONU, 301 optical communication system.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optical Communication System (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)

Abstract

L'invention concerne un dispositif relais, un système de communication optique et un procédé de commutation de redondance qui permettent de mettre en œuvre de manière avantageuse un procédé de commutation de ports de communication optique et en même temps de réduire au minimum le nombre de ports de communication optique. Un dispositif relais (101) peut être connecté à une fibre optique ramifiée en trois ou plus par une unité de ramification optique. Le dispositif relais (101) est pourvu : d'au moins trois ports de communication optique auxquels la fibre optique peut être connectée ; et d'une unité de commutation de ports (11) qui, lorsque l'un des ports de communication optique sert de port actif, commute le port actif pour qu'il passe à un autre des ports de communication optique. L'unité de commutation de ports (11) sélectionne, au cours du processus de commutation, un port de communication optique destination de commutation parmi une pluralité de ports candidats qui sont différents du port de communication optique servant de port actif.
PCT/JP2016/063061 2015-07-22 2016-04-26 Dispositif relais, système de communication optique et procédé de commutation de redondance WO2017013919A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000354009A (ja) * 1999-06-11 2000-12-19 Furukawa Electric Co Ltd:The 通信システム
JP2010045582A (ja) * 2008-08-12 2010-02-25 Nec Corp 光通信装置、および、通信方法

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* Cited by examiner, † Cited by third party
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JP2016096458A (ja) * 2014-11-14 2016-05-26 日本電信電話株式会社 ＰＯＮ（ＰａｓｓｉｖｅＯｐｔｉｃａｌＮｅｔｗｏｒｋ）システム及び通信装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000354009A (ja) * 1999-06-11 2000-12-19 Furukawa Electric Co Ltd:The 通信システム
JP2010045582A (ja) * 2008-08-12 2010-02-25 Nec Corp 光通信装置、および、通信方法

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