WO2014020896A1 - 多重障害対応光ノードとそれを用いた光通信システムおよび波長パス切り替え方法 - Google Patents
多重障害対応光ノードとそれを用いた光通信システムおよび波長パス切り替え方法 Download PDFInfo
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- WO2014020896A1 WO2014020896A1 PCT/JP2013/004597 JP2013004597W WO2014020896A1 WO 2014020896 A1 WO2014020896 A1 WO 2014020896A1 JP 2013004597 W JP2013004597 W JP 2013004597W WO 2014020896 A1 WO2014020896 A1 WO 2014020896A1
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- wavelength path
- failure
- standby
- power consumption
- optical
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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
- H04B10/038—Arrangements for fault recovery using bypasses
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/16—Error detection or correction of the data by redundancy in hardware
- G06F11/20—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
- G06F11/202—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where processing functionality is redundant
- G06F11/2023—Failover techniques
- G06F11/2025—Failover techniques using centralised failover control functionality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0287—Protection in WDM systems
- H04J14/0293—Optical channel protection
- H04J14/0295—Shared protection at the optical channel (1:1, n:m)
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/1301—Optical transmission, optical switches
Definitions
- the present invention relates to an optical node having a multiple failure recovery function, and more particularly to an optical node having a multiple failure recovery function characterized by reducing power consumption, an optical communication system using the same, and a wavelength path switching method.
- a dedicated standby wavelength path is often assigned to an operational wavelength path as disclosed in Patent Document 1.
- the standby wavelength path always has the same traffic as that of the active wavelength path, so if a failure occurs in the active wavelength path, the standby wavelength path from the active wavelength path at the wavelength path receiving end Can be switched to instantly.
- the reliability of the wavelength path is ensured by enabling high-speed failure recovery.
- the reliability improvement technique in the above-described optical node has the following problems. That is, as disclosed in Patent Document 2, the reliability increases as the number of standby wavelength paths increases, but the number of required optical transceivers increases, resulting in an increase in power consumption.
- Patent Document 1 as a method for reducing the power consumption by the standby wavelength path, the power supply to the standby wavelength path is cut off while the operating wavelength path is operating normally. A method for reducing consumption is disclosed. However, with this method, when a failure occurs in the active wavelength path, it takes time to start up by supplying power to the standby wavelength path, which hinders instantaneous switching.
- the present invention has been made in view of the above-described problems, and its purpose is to prevent failures in the operational wavelength path in order to ensure the reliability of the wavelength path against multiple failures while suppressing power consumption.
- the multi-fault handling optical node provided on the transmitting side, the multi-fault handling optical node provided on the receiving side, the node control means of the multi-fault handling optical node on the sending side, and the multi-fault handling on the receiving side An optical communication system having network control means for sharing information with the node control means of an optical node.
- the operating wavelength path is operated in the power consumption normal mode, and the power wavelength of the first standby wavelength path among the two or more standby wavelength paths assigned and ranked to the operating wavelength path is consumed.
- the operation wavelength path is switched to the protection wavelength path
- the operation wavelength path is switched to the protection wavelength path
- the operation wavelength path is switched to the protection wavelength path
- a first confirmation step for confirming whether or not there is a failure
- a second confirmation step for confirming whether or not there is a failure in the standby wavelength path of the first rank when the first confirmation step confirms that there is a failure
- the second confirmation step confirms that there is no failure
- the first switching step for switching the first-order standby wavelength path to the operational wavelength path and the second confirmation step confirm that there is a failure.
- the present invention in order to ensure the reliability of the wavelength path against multiple failures while suppressing the power consumption, it is possible to switch to the standby wavelength path at a high speed in response to the failure of the operational wavelength path.
- a multi-failure optical node, an optical communication system using the same, and a wavelength path switching method are realized.
- Controlled power consumption modes include a power consumption normal mode in which optical signal transmission / reception can be performed, and a power consumption reduction mode in which optical signal transmission / reception cannot be performed but power consumption is reduced.
- the optical transceiver in the power consumption reduction mode In order for the optical transceiver in the power consumption reduction mode to perform optical signal transmission / reception, it must be reset to the power consumption normal mode according to an instruction from the node controller.
- the optical transceivers 1001 to 1004 are connected to the optical fibers 1201 to 1204, respectively, and are received by the optical transceivers 1101 to 1104 installed in the optical node 1120.
- the power consumption modes of the optical transceivers 1101 to 1104 are also controlled by the node controller 1111 in the same manner as described above.
- Outputs of the optical transceivers 1101 to 1104 are connected to the optical switch 1110.
- the optical switch 1110 is controlled by the node controller 1111, a desired output of the optical transceivers 1101 to 1104 is selected and the optical fiber 1301 is selected. Can be output.
- the node controller 1111 also has a function of monitoring the optical signal reception quality of the optical transceivers 1101 to 1104. For example, an optical switch control that selects the optical transceiver output with the highest quality and outputs it to the optical fiber 1301. Is possible.
- the node controllers 1011 and 1111 can share information via the network controller 1400, and the optical nodes 1020 and 1120 can perform mutual cooperation control of the optical switch and the optical transceiver.
- a path using the optical fiber 1201 is an operational wavelength path.
- the operational wavelength path includes an optical switch 1010, an optical transceiver 1001, an optical fiber 1201, an optical transceiver 1101, and an optical switch 1110.
- the standby wavelength path includes a first standby wavelength path for the path using the optical fiber 1202, a second standby wavelength path for the optical fiber 1203, and a third path for the optical fiber 1204. Are preliminarily ranked as the standby wavelength paths.
- the configuration of the standby wavelength path includes the optical switch 1010, the optical transceivers 1002 to 1004, the optical fibers 1202 to 1204, the optical transceivers 1102 to 1104, and the optical switch 1110, similarly to the configuration of the operational wavelength path. (Description of operation) Next, the operation of the first embodiment of the present invention configured as described above will be described in detail with reference to FIG.
- the optical nodes 1020 and 1120 are connected by optical fibers 1201 to 1204, and the node controllers 1011 and 1111 are shared by the network controller 1400.
- the operational wavelength path is a path using the optical fiber 1201 by the network controller 1400
- the configuration is the optical switch 1010, the optical transceiver 1001, the optical fiber 1201, the optical transceiver 1101, and the optical switch 1110.
- the standby wavelength path includes a first standby wavelength path for the path using the optical fiber 1202, a second standby wavelength path for the path using the optical fiber 1203, and a first path using the optical fiber 1204.
- the three standby wavelength paths are ranked in advance, and their configurations are an optical switch 1010, optical transceivers 1002 to 1004, optical fibers 1202 to 1204, optical transceivers 1102 to 1104, and an optical switch 1110.
- Node controllers 1011 and 11 of the optical nodes 1020 and 1120 Are information sharing to 1.
- optical signal input from the optical fiber 1300 at the optical node 1020 is branched and selected by the instruction of the node controller 1011 at the optical switch 1010 and output to the optical transceivers 1001 to 1004. Accordingly, the optical signals input to the optical transceivers 1001 to 1004 are all the same. Optical signals output from the optical transceivers 1001 to 1004 are transmitted using the operational wavelength path and the first to third ranked standby wavelength paths, respectively, and the optical transceivers 1101 to 1104 in the optical node 1120 are transmitted. Is set to be received.
- the optical transceiver connected to the operational wavelength path is instructed by the node controller 1111. Only the output from 1101 is selected and output from the optical fiber 1301.
- the optical transceivers 1001 and 1002 are set to operate in the power consumption normal mode according to an instruction from the node controller 1011, and the optical transceivers 1003 and 1004 are set to operate in the power consumption reduction mode. For this reason, only the optical transceivers 1001 and 1002 are in a state in which an optical signal can be output, and an optical signal is output only to the operational wavelength path and the first standby wavelength path.
- the power consumption mode setting of the optical transceivers 1001 to 1004 is shared between the node controllers 1011 and 1111 via the network controller 1400. Since only the optical transceivers 1101 and 1102 can receive optical signals at the optical node 1120, the node controller 1111 sets the optical transceivers 1101 and 1102 in the power consumption normal mode and the optical transceivers 1103 and 1104 in the power consumption reduction mode. Instructed to work with. The node controller 1111 monitors the optical signal reception quality in the optical transceivers 1101 and 1102, and when there is no failure in the operational wavelength path, only the output of the optical transceiver 1101 connected to the operational wavelength path. Is selected by controlling the optical switch 1110 and led to the optical fiber 1301.
- the node controller 1111 detects that the optical signal reception quality in the optical transceiver 1101 has deteriorated.
- the node controller 1111 investigates the optical signal reception quality in the optical transceiver 1102 connected to the first standby wavelength path through which the same optical signal as that of the operational wavelength path is transmitted.
- failure recovery is performed by controlling the optical switch 1110 and switching the connection source of the optical fiber 1301 from the optical transceiver 1101 to 1102. .
- the optical transceiver 1103 is switched from the power consumption reduction mode to the power consumption normal mode to change the optical signal.
- the network controller 1400 notifies the node controller 1011 of the optical node 1020 that a failure has occurred in both the operating wavelength path and the first standby wavelength path at the same time.
- the node controller 1011 switches the optical transceiver 1003 from the power consumption reduction mode to the power consumption normal mode, controls the optical switch 1010, and branches the input signal from the optical fiber 1300 to the optical transceiver 1003. Operate to output.
- an input signal from the optical fiber 1300 is output to the second standby wavelength path.
- the optical transceiver 1103 connected to the second standby wavelength path is ready to receive an optical signal.
- the node controller 1111 confirms the optical signal reception quality of the optical transceiver 1103 and determines that no failure has occurred, the node controller 1111 controls the optical switch 1110 to set the connection source of the optical fiber 1301 to the optical transceiver 1103. By switching, it is possible to recover the double failure of the operating wavelength path and the first standby wavelength path.
- the node controller 1111 determines that a failure has occurred when the optical signal quality of the optical transceiver 1103 is confirmed, the optical transceivers 1104 and 1004 and the third standby wavelength path are used. Similarly, it is possible to recover the triple failure of the operating system wavelength path, the first standby system wavelength path, and the second standby system wavelength path. Even when the failure multiplicity increases, the number of optical transceivers and the number of standby wavelength paths may be increased, and the failure recovery method is the same as described above.
- the second standby wavelength path can be switched to the power consumption normal mode.
- the next standby wavelength path is switched to the power consumption normal mode.
- the failure can be recovered at high speed. It becomes possible.
- an optical transceiver for the second standby wavelength path is additionally deployed and operated. At this time, conventionally, the operation is performed in the normal power consumption mode in the same manner as the first optical transceiver for the standby wavelength path, and the required power is three times that in the case of only the active system (operating system + standby). 1 + spare 2).
- the failure occurrence probability is P ( ⁇ 1)
- the probability that a failure occurs in the first backup wavelength path in addition to the active system is P ⁇ P ( ⁇ P ⁇ 1). It is highly possible that a path optical transceiver is operated in the power consumption normal mode to consume a lot of wasted power. Therefore, in this embodiment, the power consumption in the entire optical node is reduced by operating the optical transceivers for the second and subsequent standby wavelength paths in the minimum power operation mode.
- FIG. 5 shows an optical communication system 5000 according to an embodiment configured as shown in FIG.
- SONET standard OC-192 signal as transmission signal 10G transponder as optical transmitter / receiver, 1x4 transponder aggregator as optical switch, central processing unit (CPU) as node controller and network controller, code as optical signal reception quality
- BER error rate
- the 10G transponders 5001 to 5004 output OC-192 signals, but their output wavelengths are all different, and are controlled by the CPU 5011 to output wavelengths 1 to 4, respectively.
- Wavelength 1 to wavelength 4 OC-192 signals that can be output from the 10G transponders 5001 to 5004 are wavelength multiplexed by the wavelength multiplexer 5400 and transmitted through the optical fiber 5205. After transmission through the optical fiber 5205, wavelengths 1 to 4 are demultiplexed by the wavelength demultiplexer 5401 and controlled so as to be input to the 10G transponders 5101 to 5104, respectively.
- the 10G transponders 5101 to 5104 have functions of receiving optical signals, detecting OC-192 signal frames, extracting B1 and B2 bytes from the overhead, and measuring BER.
- the measured BER is output to the CPU 5111.
- a BER threshold value is set in advance as a failure detection criterion. When the BER output from the 10G transponders 5101 to 5104 exceeds the BER threshold, the operating wavelength path of wavelength 1, the first standby wavelength path of wavelength 2, the second standby wavelength path of wavelength 3, the wavelength 4, it is determined that a failure has occurred in the third standby wavelength path.
- the high-speed wavelength path can be switched to the first standby system wavelength path in which the 10G transponders 5002 and 5102 operating in the power consumption normal mode are used.
- the wavelength path is switched after switching the power consumption mode of the 10G transponder of the second standby wavelength path.
- failure recovery is possible. If a failure also occurs in the second standby wavelength path, and further a failure occurs in the third standby wavelength path, the failure recovery can no longer be performed.
- the power consumption of the all-optical transceivers at the two nodes is 8 ⁇ P1 regardless of whether or not a failure has occurred.
- the power consumption mode of the optical transceiver connected to the wavelength path where the failure has occurred remains in the power consumption normal mode in consideration of detecting that the failure has been repaired. Since switching to the reduction mode does not affect the communication service, the power consumption difference evaluation value F can be further reduced.
- FIG. 2 shows a configuration in which two standby wavelength paths share an optical transmitter / receiver for a standby wavelength path with respect to the optical node and power control method for multiple failures according to the second embodiment of the present invention.
- FIG. 2 shows only the optical node 2020 on the transmission side, but the configuration is the same for the optical node on the reception side.
- Different optical signals from the optical fibers 2300 and 2301 are input to the transmission side optical node 2020.
- an input optical signal of the optical fiber 2300 is connected to the optical transceiver 2001 by the optical switch 2010, and an input signal of the optical fiber 2301 is connected to the optical transceiver 2002.
- the optical fiber 2200 to which the optical transceiver 2001 is connected is set to the operational wavelength path 1 for the optical signal input from the optical fiber 2300.
- the optical fiber 2202 connected to the optical transceiver 2002 is set to the operational wavelength path 2 for the optical signal input from the optical fiber 2301.
- FIG. 3 is related to the third embodiment of the present invention, and the backup wavelength path sharing shown in FIG. 2 is applied not only to the first backup wavelength path but also to the second and third backup wavelength paths. This is the case.
- FIG. 3 shows only the optical node 3102 on the transmission side, but the configuration is the same for the optical node on the reception side.
- a different optical signal is input to the transmission side optical node 3102 from the optical fibers 3300 and 3301.
- the input optical signal of the optical fiber 3300 is connected to the optical transceiver 3001 by the optical switch 3100, and the optical fiber 3301 input signal is connected to the optical transceiver 3002.
- the optical fiber 3201 to which the optical transceiver 3001 is connected is set to the operational wavelength path 1 for the optical signal input from the optical fiber 3300.
- the optical fiber 3203 connected to the optical transceiver 3002 is set to the operational wavelength path 2 for the optical signal input from the optical fiber 3301.
- both first standby wavelength paths are connected to the optical transceiver 3011.
- the first standby wavelength path is shared.
- the first standby wavelength path 2 for the operating wavelength path 3 and the operating wavelength path 4 is set in the optical fiber 3206 connected to the optical transceiver 3012.
- the second standby wavelength path for the first standby wavelength path 1 and the first standby wavelength path 2 is set in the optical fiber 3204 connected to the optical transceiver 3021.
- the second, third... Standby wavelength paths are shared.
- the operating wavelength path and the first standby wavelength path are operated in the normal power consumption mode.
- the second, third,... Standby wavelength paths are operated in the power consumption reduction mode.
- the power consumption of the entire optical node can be reduced while ensuring the reliability of the network. This is to selectively reduce the power consumed in the standby wavelength path.
- the number of required optical transceivers can be reduced.
- this embodiment is scalable. This is because the number of standby wavelength paths can be flexibly increased / decreased in accordance with the increase / decrease in the number of operating wavelength paths and the number of failure recovery multiplicity.
- FIG. 4 relates to the fourth embodiment of the present invention, and by setting the priority to the operational wavelength path, the high priority operational wavelength path performs fast failure recovery, and the low priority operational wavelength path uses power consumption. This is a case where failure recovery is performed by reduction.
- FIG. 4 shows only the optical node 4120 on the transmission side, but the configuration is the same for the optical node on the reception side.
- the input from the optical fiber 4300 is set to high priority, and the input from the optical fiber 4301 is set to low priority.
- This priority can be set by the operator of the optical node 4102 setting the node controller 4101 or the like.
- the input from the optical fiber 4300 is branched by the optical switch 4100 and guided to the optical transceivers 4001 and 4011 operating in the normal power consumption mode.
- the optical fiber 4201 to which the optical transceiver 4001 is connected is set to the active wavelength path 1
- the optical fiber 4202 to which the optical transceiver 4011 is connected is set to the first standby wavelength path 1. Since the optical transceivers used for the active wavelength path and the first standby wavelength path are operating in the power consumption normal mode, failure recovery can be performed by the 1 + 1 system, and high-speed failure recovery should be performed. Can do.
- the optical signal input from the optical fiber 4301 set to low priority is guided to the optical transceiver operating in the optical transceiver 4003 operating in the power consumption normal mode, and from the optical fiber 4205 serving as the operational wavelength path 2 Is output.
- the first standby wavelength path 2 for the active wavelength path 2 is set to the optical fiber 4206 connected to the optical transceiver 4013 operating in the power consumption reduction mode.
- the wavelength path 2 is shared as the first standby wavelength path of the optical fiber 4207 connected to the optical transceiver 4004 operating in the power consumption normal mode.
- the high-priority operational wavelength path does not reduce the power consumption, but can recover from a high-speed failure.
- the low-priority operational wavelength path can reduce the power consumption but has a low failure recovery time.
- priorities such as high priority and low priority, or by setting a distinction between priority and non-priority
- power consumption is higher than when all operating wavelength paths are uniformly recovered from high-speed failures. While reducing the amount, it is possible to selectively recover a high-speed failure selectively with respect to an important operating system wavelength path.
- the active wavelength path When assigning priorities to the active wavelength path, ultimately, the active wavelength path is treated as a priority and the first standby wavelength path is operated in the power consumption normal mode, or the non-priority is treated as the first. Whether to operate one standby wavelength path in the power consumption reduction mode must be sorted. In this case, whether or not each operational wavelength path is to be preferentially handled is determined in advance by the operator of the optical node 4102 by setting the priority order of each operational wavelength path in the node controller 4101 or the like.
- a method of preferentially treating the set maximum allowable power consumption of the optical node 4102 in order from the highest-priority operating wavelength path so as not to exceed this, or preferential treatment preset in the node controller 4101 A method of giving priority treatment according to the priority order so as not to exceed the prescribed number is possible.
- a method in which the operator of the optical node 4102 forcibly designates priority or non-priority for each operating wavelength path in advance in the node controller 4101 is also possible.
- the power consumption of the entire optical node can be reduced while ensuring the reliability of the network. This is to selectively reduce the power consumed in the standby wavelength path. Moreover, as a result of setting priority for the operational wavelength path and performing power control of the optical transceiver according to the priority, power consumption can be reduced according to the importance of the service. Furthermore, this embodiment is scalable. This is because the number of standby wavelength paths can be flexibly increased / decreased in accordance with the increase / decrease in the number of operating wavelength paths and the number of failure recovery multiplicity.
- Appendix 1 The operational wavelength path; Two or more standby wavelength paths assigned and ranked to the operational wavelength path; and A multi-failure-capable optical node, comprising: node control means for separately operating the active wavelength path and the standby wavelength path in a power consumption normal mode or a power consumption reduction mode.
- the node control means comprises: Operating the operational wavelength path and the first standby wavelength path in the power consumption normal mode, and operating the second or lower standby wavelength path in the power consumption reduction mode; The optical node for multiple failures according to appendix 1.
- the node control means comprises: When confirming whether there is a failure in the operational wavelength path and confirming that there is a failure, If there is a failure in the standby wavelength path of the first rank, and if there is no failure, the standby wavelength path of the first rank is switched to the operational wavelength path, When it is confirmed that there is a failure in the first standby wavelength path, the power consumption reduction mode is switched to the power consumption normal mode in order from the higher rank of the second and lower standby wavelength paths. Confirming and switching the standby wavelength path of the second or lower rank that first confirmed no failure to the operational wavelength path; The optical node corresponding to multiple failures according to appendix 2.
- the node control means comprises: Specify priority or non-priority for the operational wavelength path, If the priority is given, Operating the operational wavelength path and the first standby wavelength path in the power consumption normal mode; operating the second and lower standby wavelength paths in the power consumption reduction mode; When checking whether there is a failure in the operational wavelength path and confirming that there is a failure, When confirming whether or not there is a failure in the first-order backup wavelength path and confirming that there is no failure, switch the first-order backup wavelength path to the operational wavelength path, When it is confirmed that there is a failure in the first standby wavelength path, the power consumption reduction mode is switched to the power consumption normal mode in order from the higher rank of the second and lower standby wavelength paths.
- the node control means comprises: In specifying the priority or non-priority of the operational wavelength path, From the priority order of the operational wavelength path preset in the node control means and the maximum allowable power consumption preset in the node control means, according to the priority order so as not to exceed the maximum allowable power consumption.
- the optical node for multi-faults according to appendix 4, wherein the operating wavelength path to be given priority is designated.
- the node control means comprises: In specifying the priority or non-priority of the operational wavelength path, Priority according to the priority order so as not to exceed the prescribed number from the priority order of the operational wavelength path preset in the node control means and the prescribed number set as the priority preset in the node control means.
- the operational wavelength path and the standby wavelength path are: The optical node corresponding to multiple failures according to any one of appendices 1 to 7, comprising an optical switch unit and an optical transmission / reception unit.
- Appendix 12 The optical communication system according to appendix 9, wherein the information to be shared is a failure occurrence state of the active wavelength path and the standby wavelength path.
- Appendix 13 Operate the active wavelength path in normal power consumption mode, Of the two or more standby wavelength paths that are assigned to the operational wavelength path and are ranked, the first standby wavelength path is operated in the power consumption normal mode, and the second or lower standby wavelength path is used.
- a first confirmation step of confirming whether there is a failure in the operational wavelength path When the first confirmation step confirms that there is a failure, a second confirmation step is performed to check whether or not the first-order wavelength path has a failure; A first switching step of switching the first standby wavelength path to the operational wavelength path when the second confirmation step confirms no failure; When the second confirmation step confirms that there is a failure, a third confirmation is performed by confirming whether there is a failure in the standby wavelength path of the second or lower rank by switching to the power consumption normal mode in order from the highest rank.
- a wavelength path switching method comprising: (Appendix 14) Operate the active wavelength path in normal power consumption mode, Specify priority or non-priority for the operational wavelength path, The operation of one or more standby wavelength paths assigned to the operational wavelength path and ranked is: In the case of the priority, the standby wavelength path of the first rank is operated in the power consumption normal mode, and the backup wavelength path of the second rank or less is operated in the power consumption reduction mode. In the case of non-priority, the standby wavelength path is operated in a power consumption reduction mode.
- a first confirmation step of confirming whether there is a failure in the operational wavelength path If the first confirmation step confirms that there is a failure, In case of priority, A second confirmation step for confirming the presence or absence of a failure of the first-order backup wavelength path; A first switching step of switching the first standby wavelength path to the operational wavelength path when the second confirmation step confirms no failure;
- a third confirmation is performed by confirming whether there is a failure in the standby wavelength path of the second or lower rank by switching to the power consumption normal mode in order from the highest rank.
- a wavelength path switching method comprising:
- the present invention relates to an optical node having a multiple failure recovery function, and more particularly to an optical node having a multiple failure recovery function characterized by reducing power consumption, an optical communication system using the same, and a wavelength path switching method.
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Abstract
Description
(第1の実施形態)
(構成の説明)
図1を参照して、本発明の第1の実施形態について詳細に説明する。図1に示す光通信システム1000において、光ノード1020に光ファイバ1300より光信号が入力され、その入力信号は光スイッチ1010へと導かれる。光スイッチ1010は、ノードコントローラ1011によって制御される。光信号は、光スイッチ1010によって所望のスイッチングが行われた後、光送受信機1001~1004へと導かれる。
(動作の説明)
次に、上記のように構成された本発明の第1の実施形態の動作について、図1を参照しながら詳細に説明する。
(効果の説明)
上記の本発明の第1の実施形態の構成において、運用系波長パス向け光送受信機に対する第一の予備系波長パス向け光送受信機は、電力消費通常モードで動作する。従って、1重障害に対する運用系波長パスの障害回復時間、および電力消費量は低減されてはいない。2重障害に備えるためには、第二の予備系波長パス向け光送受信機を追加的に配備し運用する。このとき、従来であれば第一の予備系波長パス向け光送受信機と同様に電力消費通常モードで動作させることになり、必要電力は運用系のみの場合に対して3倍(運用系+予備1+予備2)となる。
(実施例)
図5は、図1の構成の実施例の光通信システム5000を示す。伝送信号としてSONET規格のOC-192信号、光送受信機として10Gトランスポンダ、光スイッチとして1x4トランスポンダアグリゲータ、ノードコントローラおよびネットワークコントローラとして中央処理装置(Central Processing Unit、以下、CPU)、光信号受信品質として符号誤り率(BER)を利用し、運用系波長パス、第一~第三の予備系波長パスを、波長合波器5400、波長分波器5401を用いた波長多重技術を利用して光信号伝送する例である。ここで、10Gトランスポンダにおける電力消費通常モードの電力消費量をP1、電力消費低減モードの電力消費量をP2とすれば、P1>P2の関係が成り立つ。その他は図1と同様である。
(第2の実施形態)
図2は、本発明の第2の実施形態の多重障害対応光ノードおよび電力制御方法に関して、予備系波長パス向けの光送受信機を2つの予備系波長パスで共有する構成を示す。図2は、送信側の光ノード2020についてのみ示しているが、受信側の光ノードに関しても同様な構成である。
(第3の実施形態)
図3は、本発明の第3の実施形態に関し、図2で示した予備系波長パス共有化を、第一の予備系波長パスだけでなく、第二、第三の予備系波長パスにも適用する場合である。図3は、送信側の光ノード3102についてのみ示しているが、受信側の光ノードに関しても同様な構成である。
(第4の実施形態)
図4は、本発明の第4の実施形態に関し、運用系波長パスに優先度を設定することにより、高優先運用系波長パスは高速障害回復を行い、低優先運用系波長パスは電力消費量低減で障害回復を行う場合である。図4は、送信側の光ノード4120についてのみ示しているが、受信側の光ノードに関しても同様な構成である。
(付記1)
運用系波長パスと、
前記運用系波長パスに割り当てられ、かつ、順位付けられた、二つ以上の予備系波長パスと、
前記運用系波長パスと前記予備系波長パスとを電力消費通常モードあるいは電力消費低減モードで運用し分けるノードコントロール手段と、を有する多重障害対応光ノード。
(付記2)
前記ノードコントロール手段が、
前記運用系波長パスと第1位の前記予備系波長パスとを電力消費通常モードで運用し、第2位以下の前記予備系波長パスを電力消費低減モードで運用する、
付記1記載の多重障害対応光ノード。
(付記3)
前記ノードコントロール手段が、
前記運用系波長パスの障害有無の確認を行い、障害有を確認した場合、
第1位の前記予備系波長パスの障害有無を確認し、障害無を確認した場合、第1位の前記予備系波長パスを前記運用系波長パスに切り替え、
第1位の前記予備系波長パスの障害有を確認した場合、第2位以下の前記予備系波長パスの上位の順位から順に前記電力消費減少モードを前記電力消費通常モードに切り替えて障害有無の確認を行い、障害無を最初に確認した第2位以下の前記予備系波長パスを、前記運用系波長パスに切り替える、
付記2記載の多重障害対応光ノード。
(付記4)
前記ノードコントロール手段が、
前記運用系波長パスに優先あるいは非優先の指定を行い、
前記優先とした場合、
前記運用系波長パスと第1位の前記予備系波長パスとを電力消費通常モードで運用し、第2位以下の前記予備系波長パスを電力消費低減モードで運用し、
前記運用系波長パスの障害有無の確認を行い障害有を確認した場合、
第1位の前記予備系波長パスの障害有無の確認を行い障害無を確認した場合、第1位の前記予備系波長パスを前記運用系波長パスに切り替え、
第1位の前記予備系波長パスの障害有を確認した場合、第2位以下の前記予備系波長パスの上位の順位から順に前記電力消費低減モードから前記電力消費通常モードに切り替えて障害有無の確認を行い、障害無を確認した最初の第2位以下の前記予備系波長パスを前記運用系波長パスに切り替え、
前記非優先とした場合、
前記運用系波長パスを電力消費通常モードで運用し、前記予備系波長パスを電力消費低減モードで運用し、
前記運用系波長パスの障害有無の確認を行い障害有を確認した場合、
前記予備系波長パスの上位の順位から順に前記電力消費低減モードから前記電力消費通常モードに切り替えて障害有無の確認を行い、障害無を確認した最初の前記予備系波長パスを前記運用系波長パスに切り替える、
付記1記載の多重障害対応光ノード。
(付記5)
前記ノードコントロール手段が、
前記運用系波長パスの優先あるいは非優先の指定にあたり、
前記ノードコントロール手段に予め設定された前記運用系波長パスの優先順位と、前記ノードコントロール手段に予め設定された最大許容消費電力量とから、前記最大許容電力量を超えないように前記優先順位に従って優先とする前記運用系波長パスを指定する、付記4記載の多重障害対応光ノード。
(付記6)
前記ノードコントロール手段が、
前記運用系波長パスの優先あるいは非優先の指定にあたり、
前記ノードコントロール手段に予め設定された前記運用系波長パスの優先順位と、前記ノードコントロール手段に予め設定された優先とする規定数とから、前記規定数を超えないように前記優先順位に従って優先とする前記運用系波長パスを指定する、付記4記載の多重障害対応光ノード。
(付記7)
前記運用系波長パスが複数であって、前記複数の運用系波長パスが前記予備系波長パスを共有する、付記1乃至6の何れか1項記載の多重障害対応光ノード。
(付記8)
前記運用系波長パスと前記予備系波長パスとが、
光スイッチ手段と光送受信手段とを有する、付記1乃至7の何れか1項記載の多重障害対応光ノード。
(付記9)
送信側に備えられた前記多重障害対応光ノードと、
受信側に備えられた前記多重障害対応光ノードと、
前記送信側の多重障害対応光ノードの前記ノードコントロール手段と、前記受信側の多重障害対応光ノードの前記ノードコントロール手段の、情報共有を行うネットワークコントロール手段と、
を有する光通信システム。
(付記10)
前記情報共有する情報が、前記運用系波長パスと前記予備系波長パスの構成である、付記9記載の光通信システム。
(付記11)
前記情報共有する情報が、前記電力消費通常モードあるいは前記電力消費低減モードの設定である、付記9記載の光通信システム。
(付記12)
前記情報共有する情報が、前記運用系波長パスと前記予備系波長パスの障害の発生状況である、付記9記載の光通信システム。
(付記13)
運用系波長パスを電力消費通常モードで運用し、
前記運用系波長パスに割り当てられ、かつ、順位付けられた二つ以上の予備系波長パスの内、第1位の前記予備系波長パスを前記電力消費通常モードで運用し、第2位以下の前記予備系波長パスを電力消費低減モードで運用する、
前記運用系波長パスを前記予備系波長パスに切り替える、波長パス切り替え方法において、
前記運用系波長パスの障害の有無を確認する、第1の確認工程と、
前記第1の確認工程が障害有を確認した場合、第1位の前記予備系波長パスの障害有無の確認を行う、第2の確認工程と、
前記第2の確認工程が障害無を確認した場合、第1位の前記予備系波長パスを前記運用系波長パスに切り替える、第1の切り替え工程と、
前記第2の確認工程が障害有を確認した場合、第2位以下の前記予備系波長パスの障害有無の確認を、上位の順位から順に前記電力消費通常モードに切り替えて行う、第3の確認工程と、
前記第3の確認工程が障害無を最初に確認した第2位以下の前記予備系波長パスを前記運用系波長パスに切り替える、第2の切り替え工程と、
を有する、波長パス切り替え方法。
(付記14)
運用系波長パスを電力消費通常モードで運用し、
前記運用系波長パスに優先あるいは非優先の指定を行い、
前記運用系波長パスに割り当てられ、かつ、順位付けられた一つ以上の予備系波長パスの運用が、
前記優先の場合、第1位の前記予備系波長パスを電力消費通常モードで運用し、第2位以下の前記予備系波長パスを電力消費低減モードで運用し、
前記非優先の場合、前記予備系波長パスを電力消費低減モードで運用する、
前記運用系波長パスを前記予備系波長パスに切り替える、波長パス切り替え方法において、
前記運用系波長パスの障害の有無を確認する、第1の確認工程と、
前記第1の確認工程が障害有を確認した場合、
前記優先の場合、
第1位の前記予備系波長パスの障害有無の確認を行う、第2の確認工程と、
前記第2の確認工程が障害無を確認した場合、第1位の前記予備系波長パスを前記運用系波長パスに切り替える、第1の切り替え工程と、
前記第2の確認工程が障害有を確認した場合、第2位以下の前記予備系波長パスの障害有無の確認を、上位の順位から順に前記電力消費通常モードに切り替えて行う、第3の確認工程と、
前記第3の確認工程が障害無を最初に確認した第2位以下の前記予備系波長パスを前記運用系波長パスに切り替える、第2の切り替え工程と、
前記非優先の場合、
前記予備系波長パスの障害有無の確認を、上位の順位から順に前記電力消費通常モードに切り替えて行う、第4の確認工程と、
前記第4の確認工程が障害無を最初に確認した前記予備系波長パスを前記運用系波長パスに切り替える、第3の切り替え工程と、
を有する、波長パス切り替え方法。
1001~1004、1101~1104 光送受信機
1201~1204、1300、1301 光ファイバ
1010、1110 光スイッチ
1011、1111 ノードコントローラ
1400 ネットワークコントローラ
1020、1120 光ノード
2001~2006 光送受信機
2200~2205、2300 光ファイバ
2010 光スイッチ
2011 ノードコントローラ
2020 光ノード
3001~3008、3011~3014 光送受信機
3021~3022、3031 光送受信機
3201~3215、3300~3301 光ファイバ
3100 光スイッチ
3101 ノードコントローラ
3102 光ノード
4001~4008、4011~4015 光送受信機
4201~4215、4300~4301 光ファイバ
4100 光スイッチ
4101 ノードコントローラ
4102 光ノード
5000 光通信システム
5001~5004、5101~5104 10Gトランスポンダ
5201~5204、5300、5301、5205 光ファイバ
5400 光合波器
5401 光分波器
5010、5110 1×4トランスポンダアグリゲータ
5011、5111、5410 CPU
5020、5120 光ノード
Claims (10)
- 運用系波長パスと、
前記運用系波長パスに割り当てられ、かつ、順位付けられた、二つ以上の予備系波長パスと、
前記運用系波長パスと前記予備系波長パスとを電力消費通常モードあるいは電力消費低減モードで運用し分けるノードコントロール手段と、を有する多重障害対応光ノード。 - 前記ノードコントロール手段が、
前記運用系波長パスと第1位の前記予備系波長パスとを電力消費通常モードで運用し、第2位以下の前記予備系波長パスを電力消費低減モードで運用する、
請求項1記載の多重障害対応光ノード。 - 前記ノードコントロール手段が、
前記運用系波長パスの障害有無の確認を行い、障害有を確認した場合、
第1位の前記予備系波長パスの障害有無を確認し、障害無を確認した場合、第1位の前記予備系波長パスを前記運用系波長パスに切り替え、
第1位の前記予備系波長パスの障害有を確認した場合、第2位以下の前記予備系波長パスの上位の順位から順に前記電力消費減少モードを前記電力消費通常モードに切り替えて障害有無の確認を行い、障害無を最初に確認した第2位以下の前記予備系波長パスを、前記運用系波長パスに切り替える、
請求項2記載の多重障害対応光ノード。 - 前記ノードコントロール手段が、
前記運用系波長パスに優先あるいは非優先の指定を行い、
前記優先とした場合、
前記運用系波長パスと第1位の前記予備系波長パスとを電力消費通常モードで運用し、第2位以下の前記予備系波長パスを電力消費低減モードで運用し、
前記運用系波長パスの障害有無の確認を行い障害有を確認した場合、
第1位の前記予備系波長パスの障害有無の確認を行い障害無を確認した場合、第1位の前記予備系波長パスを前記運用系波長パスに切り替え、
第1位の前記予備系波長パスの障害有を確認した場合、第2位以下の前記予備系波長パスの上位の順位から順に前記電力消費低減モードから前記電力消費通常モードに切り替えて障害有無の確認を行い、障害無を確認した最初の第2位以下の前記予備系波長パスを前記運用系波長パスに切り替え、
前記非優先とした場合、
前記運用系波長パスを電力消費通常モードで運用し、前記予備系波長パスを電力消費低減モードで運用し、
前記運用系波長パスの障害有無の確認を行い障害有を確認した場合、
前記予備系波長パスの上位の順位から順に前記電力消費低減モードから前記電力消費通常モードに切り替えて障害有無の確認を行い、障害無を確認した最初の前記予備系波長パスを前記運用系波長パスに切り替える、
請求項1記載の多重障害対応光ノード。 - 前記運用系波長パスが複数であって、前記複数の運用系波長パスが前記予備系波長パスを共有する、請求項1乃至4の何れか1項記載の多重障害対応光ノード。
- 前記運用系波長パスと前記予備系波長パスとが、
光スイッチ手段と光送受信手段とを有する、請求項1乃至5の何れか1項記載の多重障害対応光ノード。 - 送信側に備えられた前記多重障害対応光ノードと、
受信側に備えられた前記多重障害対応光ノードと、
前記送信側の多重障害対応光ノードの前記ノードコントロール手段と、前記受信側の多重障害対応光ノードの前記ノードコントロール手段の、情報共有を行うネットワークコントロール手段と、
を有する光通信システム。 - 前記情報共有する情報が、前記運用系波長パスと前記予備系波長パスの構成、あるいは、前記電力消費通常モードあるいは前記電力消費低減モードの設定、あるいは、前記運用系波長パスと前記予備系波長パスの障害の発生状況の、少なくともひとつである請求項7記載の光通信システム。
- 運用系波長パスを電力消費通常モードで運用し、
前記運用系波長パスに割り当てられ、かつ、順位付けられた二つ以上の予備系波長パスの内、第1位の前記予備系波長パスを前記電力消費通常モードで運用し、第2位以下の前記予備系波長パスを電力消費低減モードで運用する、
前記運用系波長パスを前記予備系波長パスに切り替える、波長パス切り替え方法において、
前記運用系波長パスの障害の有無を確認する、第1の確認工程と、
前記第1の確認工程が障害有を確認した場合、第1位の前記予備系波長パスの障害有無の確認を行う、第2の確認工程と、
前記第2の確認工程が障害無を確認した場合、第1位の前記予備系波長パスを前記運用系波長パスに切り替える、第1の切り替え工程と、
前記第2の確認工程が障害有を確認した場合、第2位以下の前記予備系波長パスの障害有無の確認を、上位の順位から順に前記電力消費通常モードに切り替えて行う、第3の確認工程と、
前記第3の確認工程が障害無を最初に確認した第2位以下の前記予備系波長パスを前記運用系波長パスに切り替える、第2の切り替え工程と、
を有する、波長パス切り替え方法。 - 運用系波長パスを電力消費通常モードで運用し、
前記運用系波長パスに優先あるいは非優先の指定を行い、
前記運用系波長パスに割り当てられ、かつ順位付けられた一つ以上の予備系波長パスの運用が、
前記優先の場合、第1位の前記予備系波長パスを電力消費通常モードで運用し、第2位以下の前記予備系波長パスを電力消費低減モードで運用し、
前記非優先の場合、前記予備系波長パスを電力消費低減モードで運用する、
前記運用系波長パスを前記予備系波長パスに切り替える、波長パス切り替え方法において、
前記運用系波長パスの障害の有無を確認する、第1の確認工程と、
前記第1の確認工程が障害有を確認した場合、
前記優先の場合、
第1位の前記予備系波長パスの障害有無の確認を行う、第2の確認工程と、
前記第2の確認工程が障害無を確認した場合、第1位の前記予備系波長パスを前記運用系波長パスに切り替える、第1の切り替え工程と、
前記第2の確認工程が障害有を確認した場合、第2位以下の前記予備系波長パスの障害有無の確認を、上位の順位から順に前記電力消費通常モードに切り替えて行う、第3の確認工程と、
前記第3の確認工程が障害無を最初に確認した第2位以下の前記予備系波長パスを前記運用系波長パスに切り替える、第2の切り替え工程と、
前記非優先の場合、
前記予備系波長パスの障害有無の確認を、上位の順位から順に前記電力消費通常モードに切り替えて行う、第4の確認工程と、
前記第4の確認工程が障害無を最初に確認した前記予備系波長パスを前記運用系波長パスに切り替える、第3の切り替え工程と、
を有する、波長パス切り替え方法。
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