WO2015063956A1 - 子局装置、親局装置、制御装置、通信システムおよび波長切り替え方法 - Google Patents
子局装置、親局装置、制御装置、通信システムおよび波長切り替え方法 Download PDFInfo
- Publication number
- WO2015063956A1 WO2015063956A1 PCT/JP2013/079796 JP2013079796W WO2015063956A1 WO 2015063956 A1 WO2015063956 A1 WO 2015063956A1 JP 2013079796 W JP2013079796 W JP 2013079796W WO 2015063956 A1 WO2015063956 A1 WO 2015063956A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- station device
- wavelength
- optical
- unit
- communication failure
- Prior art date
Links
Images
Classifications
-
- 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
-
- 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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0791—Fault location on the transmission path
-
- 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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0799—Monitoring line transmitter or line receiver equipment
-
- 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
- H04B10/40—Transceivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0282—WDM tree architectures
-
- 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]
- H04L12/40—Bus networks
- H04L12/403—Bus networks with centralised control, e.g. polling
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0005—Switch and router aspects
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0005—Switch and router aspects
- H04Q2011/0007—Construction
- H04Q2011/0016—Construction using wavelength multiplexing or demultiplexing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0005—Switch and router aspects
- H04Q2011/0037—Operation
- H04Q2011/0043—Fault tolerance
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
- H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability
Definitions
- the present invention relates to a slave station device, a master station device, a control device, a communication system, and a wavelength switching method for realizing wavelength division multiplexing communication.
- a PON Passive Optical Network
- the signal transmission speed has been increased so far.
- the signal itself does not increase in speed, and a different wavelength channel is used.
- a configuration that increases the total amount of data transmitted through the optical fiber that is, a PON system (hereinafter, wavelength division multiplexing PON system) to which wavelength division multiplexing (WDM) is applied has been studied.
- wavelength division multiplexing PON system multiple wavelengths can be used for downstream communication (downlink communication) from OLT (Optical Line Terminal) to ONU (Optical Network Unit) and upstream communication in the reverse direction.
- OLT Optical Line Terminal
- ONU Optical Network Unit
- Each ONU communicates with the OLT using one of a plurality of usable wavelengths (see, for example, Patent Document 1).
- a transmission band for one wavelength is shared by 32 users in a PON system that does not perform wavelength multiplexing.
- a wavelength multiplexing PON system configured to use 4 waves each for the upstream wavelength and the downstream wavelength, the number of accommodated users per wavelength is reduced to 8 users (when users are assigned to each wavelength evenly). be able to. That is, the bandwidth allocated to one user can be quadrupled.
- the OLT of the wavelength division multiplexing PON system includes a plurality of optical transceivers for transmitting each of a plurality of wavelengths to be used, and other transceivers are operating normally even if an optical transceiver used for transmission of a certain wavelength fails. There are cases. In such a case, it is desirable to allocate a different wavelength to a user who has become unable to communicate due to a failure of the optical transceiver so that communication can be continued.
- the present invention has been made in view of the above, and an object of the present invention is to obtain a slave station device, a master station device, a control device, a communication system, and a wavelength switching method that realize highly reliable communication.
- the present invention can simultaneously transmit a plurality of optical signals having different wavelengths and simultaneously receive a plurality of optical signals having different wavelengths.
- a plurality of optical signals that can be received by the master station apparatus and receive any one of a plurality of optical signals that can be transmitted by the master station apparatus.
- An optical transmission / reception unit for transmitting any one of the signals, a communication failure detection unit for detecting a communication failure with the master station device, and the communication failure detection unit detecting the communication failure when the optical failure is detected.
- a wavelength selection unit that changes a setting of a downstream wavelength received and a transmission upstream wavelength.
- the slave station device is used even when communication using a part of a plurality of optical signals that can be transmitted and received by the master station device becomes impossible due to a failure on the master station device side. There is an effect that communication can be continued by switching the wavelength.
- FIG. 1 is a diagram showing a configuration example of a communication system according to the present invention.
- FIG. 2 is a flowchart showing an operation example of the ONU.
- FIG. 3 is a flowchart showing an operation example of the OLT.
- FIG. 4 is a diagram illustrating an example of an ONU accommodation state in the PON termination unit.
- FIG. 5 is a diagram illustrating an example of an ONU accommodation state in the PON termination unit.
- FIG. 6 is a diagram illustrating an example of an ONU accommodation state in the PON termination unit.
- FIG. 7 is a flowchart illustrating an operation example of the ONU according to the third embodiment.
- FIG. 1 is a diagram showing a configuration example of a communication system according to the present invention.
- the communication system will be described by taking a wavelength multiplexed PON (Passive Optical Network) system as an example, but the invention is not limited to the PON system.
- PON Passive Optical Network
- the wavelength division multiplexing PON system includes an OLT (Optical Line Terminal) 1 that operates as a master station apparatus, and n units that are connected to the OLT 1 through optical fibers and a splitter 200 and operate as slave station apparatuses.
- ONU Optical Network Unit
- ONU 100 1 ,..., 100 n Optical Network Unit
- four wavelengths are assigned to each of uplink communication and downlink communication, and each ONU 100 communicates with the OLT 1 using a specific one of the four wavelengths.
- the structure which makes the wavelength which can be used 4 wavelengths is an example, and as long as it is 2 wavelengths or more, it does not matter how many wavelengths.
- the internal configuration of each ONU 100 is the same. In FIG. 1, only the internal configuration of the ONU 100 1 is shown, and the internal configuration of the ONU 100 n is not shown.
- the OLT 1 includes an ONU management unit 2, a frame distribution unit 3, a plurality of PON termination units 4 (PON termination units 4 1 to 4 4 ), and the same number of optical transmitters as the PON termination units 4. (Tx) 11 to 14, optical receivers (Rx) 21 to 24, and multiplexing units 31 to 33 are provided.
- the ONU management unit 2 serving as an information management unit is configured to include individual information (serial number, MAC address, etc.) of each ONU 100 accommodated in the OLT 1, wavelengths used by each ONU 100, and various types of ONUs 100 assigned in the discovery process. Manage information.
- the frame distribution unit 3 transmits / receives a frame to / from an upper network (not shown).
- the frame is output to the PON terminal unit 4 that accommodates the destination ONU 100.
- the PON terminator 4 as an optical terminator is physically connected to any one of the optical transmitters 11 to 14 and any one of the optical receivers 21 to 24, and is connected to the optical transmitter. And it communicates with ONU100 via an optical receiver. That is, a frame for PON control is transmitted / received to / from each ONU 100.
- the optical transmitter 11 and optical receiver 21 with respect to PON terminating unit 4 1 is connected
- the optical transmitter 12 and optical receiver 22 is connected to the PON terminating unit 4 2
- PON termination part 4 3 optical transmitter 13 and optical receiver 23 is connected to, it is assumed that the optical transmitter 14 and optical receiver 24 with respect to PON terminating unit 4 4 are connected.
- the optical transmitters 11 to 14 convert the electrical signal output from the connected PON termination unit 4 into an optical signal, and transmit the optical signal to the ONU 100 via the multiplexing unit 31.
- the optical transmitters 11 to 14 transmit optical signals having wavelengths ⁇ 11 to ⁇ 14 , respectively. Note that ⁇ 11 is on the short wavelength side.
- the optical receivers 21 to 24 convert the optical signal received from the ONU 100 via the multiplexing unit 32 into an electrical signal and output it to the connected PON termination unit 4.
- the optical receivers 21 to 24 receive optical signals having wavelengths ⁇ 21 to ⁇ 24 , respectively. Note that ⁇ 21 is on the short wavelength side.
- the multiplexing unit 31 combines the optical signals output from the optical transmitters 11 to 14 and outputs the combined optical signals to the multiplexing unit 33.
- the multiplexing unit 32 receives an optical signal in which a plurality of wavelengths are multiplexed from the multiplexing unit 33, demultiplexes each multiplexed wavelength, and outputs the demultiplexed signals to the optical receivers 21 to 24.
- the multiplexing unit 33 multiplexes the optical transmission signal received from the multiplexing unit 31 and the optical reception signal received from each ONU 100.
- the ONU 100 includes a communication failure detection unit 101, a wavelength selection unit 102, a PON-MAC unit 103, an optical transmission / reception unit 104 including an optical receiver 104A and an optical transmitter 104B, and multiplexing.
- Unit 105 the ONU 100 includes a communication failure detection unit 101, a wavelength selection unit 102, a PON-MAC unit 103, an optical transmission / reception unit 104 including an optical receiver 104A and an optical transmitter 104B, and multiplexing.
- Unit 105 is a communication failure detection unit 101, a wavelength selection unit 102, a PON-MAC unit 103, an optical transmission / reception unit 104 including an optical receiver 104A and an optical transmitter 104B, and multiplexing.
- the communication failure detection unit 101 detects a communication failure by monitoring a frame transmitted from the OLT 1.
- the wavelength selection unit 102 selects a wavelength to be used for communication with the OLT 1 and performs setting for using the selected wavelength on the optical transmission / reception unit 104.
- the PON-MAC unit 103 (control device) transmits / receives a frame for PON control to / from the PON termination unit 4 of the OLT 1.
- the optical transmission / reception unit 104 can adjust the wavelength of an optical signal to be transmitted / received, and transmits / receives an optical signal having a wavelength specified by the wavelength selection unit 102.
- the wavelength (upstream wavelength and downstream wavelength) selected by the wavelength selection unit 102 is notified from the wavelength selection unit 102, the wavelength received by the optical receiver 104A and the wavelength transmitted by the optical transmitter 104B are adjusted according to the notification content. To do.
- the combination of the reception wavelength ( ⁇ 11 to ⁇ 14 ) and the transmission wavelength ( ⁇ 21 to ⁇ 24 ) is fixed.
- ⁇ 1x the wavelength transmitted by the optical transmitter 104B
- the description will be made as an integrated optical transmission / reception unit 104 including the optical receiver 104A and the optical transmitter 104B, but the optical receiver 104A and the optical transmitter 104B may be independent.
- the multiplexing unit 105 multiplexes the optical transmission signal received from the optical transmitter 104B and the optical reception signal received from the OLT 1.
- the recovery operation when a communication failure occurs will be described.
- an operation when the optical transmitter 11 having the transmission wavelength ⁇ 11 out of the optical transmitters 11 to 14 included in the OLT 1 fails will be described.
- the ONU 100 1 receives an optical signal having a wavelength ⁇ 11 .
- the operation when the optical transmitters 12 to 14 fail is the same.
- FIG. 2 is a flowchart illustrating an operation example of the ONU 100.
- the communication failure detection unit 101 monitors whether a frame has been received within a certain period (step S11). For example, if the communication failure detection unit 101 receives a control frame within the T1 period, the communication failure detection unit 101 continues the monitoring operation (step S11: Yes). The communication failure detection unit 101 outputs the received frame to the PON-MAC unit 103. On the other hand, when the control frame is not received over the period T1, it is determined that the optical transmitter (optical transmitter 11) that transmits the selected optical signal having the wavelength ⁇ 11 has failed, and the wavelength selection unit 102 is notified of the failure. The wavelength changing operation to be used is started (step S11: No).
- the control frame means a control frame that the ONU needs to receive at least once within 50 ms, such as a GATE message, and the ITU-T standard G-PON. In this case, it means a frame header every 125 ⁇ s.
- the value of T1 is determined according to the applied standard. That is, T1 is set to a value larger than 50 ms in the case of EPON, and T1 is set to a value larger than 125 ⁇ s in the case of G-PON.
- the communication failure detection unit 101 has, for example, a counter that counts T1, and resets the counter when receiving a control frame from the OLT 1.
- the counter expires, and the communication failure detection unit 101 detects the state of the optical transmitter on the OLT 1 side.
- the wavelength selection unit 102 is notified of failure detection.
- the wavelength selection unit 102 adjusts the optical transmission / reception unit 104 to set to transmit / receive a wavelength different from the wavelength that has been transmitted / received so far. That is, the optical receiver 104A is adjusted, the received optical wavelength is tuned so as to receive an optical signal having a wavelength different from the wavelength ⁇ 11 that has been received so far, and the optical transmitter 104B is adjusted.
- the transmission light wavelength is tuned so that an optical signal having a wavelength different from the wavelength ⁇ 21 that has been transmitted is transmitted. For example, tuning is performed so that the wavelength ⁇ 12 is received and the wavelength ⁇ 22 is transmitted (step S 12).
- the PON-MAC unit 103 returns from the operation state to the initial state and waits for receiving a downstream frame when the communication failure detection unit 101 detects a failure of the optical transmitter (optical transmitter 11) on the OLT 1 side. Transition to the state. Thereafter, the PON-MAC unit 103 waits for reception of a frame for assigning a discovery grant from the OLT 1 and responds to the reception, and transits to an operation state through a discovery process (steps S13, S14, S15, S16).
- the communication failure detection unit 101 monitors whether or not a frame has been received within a certain period (T1 period) (step S13). If the frame cannot be received (step S13: No), the communication failure detection unit 101 performs the above step S12. It is determined that the optical transmitter (optical transmitter 12) on the OLT 1 side that transmits the optical signal having the changed wavelength ⁇ 12 has failed, and the wavelength to be transmitted / received is changed again (step S12). For example, the reception wavelength is changed to ⁇ 13 and the transmission wavelength is changed to ⁇ 23 .
- step S13 When the communication failure detection unit 101 receives a frame (step S13: Yes), the frame is passed to the PON-MAC unit 103, and the PON-MAC unit 103 checks whether the received frame is a frame to which a discovery grant is assigned. (Step S14). If the received frame is a frame to which a discovery grant is assigned (step S14: Yes), the PON-MAC unit 103 executes a discovery process (step S15), and starts operation when the process is completed (step S16). If the received frame is not a frame to which a discovery grant is assigned (step S14: No), processing corresponding to the received frame is executed (step S17), and the process returns to step S13 to wait for reception of the next frame. The above steps S12 and S13 are repeatedly executed until the ONU 100 1 is in the operating state.
- the communication failure detection unit 101 detects a failure based on whether or not a control frame has been received within the T1 period (whether or not the elapsed time since the last reception of the control frame has reached T1).
- a failure may be detected depending on whether a control frame or a data frame is received within the T1 period. That is, when a counter for counting T1 is provided, the counter may be reset when a control frame or a data frame is received.
- the communication failure detection unit 101 and the wavelength selection unit 102 are configured separately, they may be combined into one.
- the PON-MAC unit 103 may have one or both of the functions realized by the communication failure detection unit 101 and the wavelength selection unit 102.
- FIG. 3 is a flowchart showing an operation example of the OLT 1, and specifically shows the operation when the ONU 100 that desires to start operation is requested to start the discovery process.
- the PON termination unit 4 determines whether or not the received frame is a frame requesting the start of the discovery process (registration request frame) (step S21). In the case of a registration request frame (step S21: Yes), the PON termination unit 4 outputs the received frame to the ONU management unit 2, and the ONU management unit 2 determines whether or not it is initial registration (step S22). The ONU management unit 2 determines initial registration when the transmission source of the registration request frame received from the PON termination unit 4 is the ONU 100 connected for the first time to its own device (OLT 1).
- the transmission source of the registration request frame is the ONU 100 in which the initial registration has been completed and is in the operating state, it is determined that the registration is other than initial registration (hereinafter referred to as re-registration).
- the ONU management unit 2 manages the individual number (identification information) of the ONU 100 accommodated in the OLT 1, it can determine whether or not it is initial registration.
- the ONU management unit 2 executes a normal registration operation. For example, information on the ONU 100 that is the registration request source is notified to an authentication server (not shown), and an inquiry is made as to whether or not the ONU 100 is a legitimate user (whether or not a user can receive communication service provision) (user authentication processing). If it is a legitimate user, an ONUID (or LLID (Logical Link ID)) assigned to the ONU 100 is determined (step S23). In the user authentication process, information related to the contracted service (for example, information on the set bandwidth such as the maximum bandwidth and the minimum guaranteed bandwidth) is acquired.
- the ONU management unit 2 collects information (authentication information, set band information, etc.) obtained by executing the user authentication process and information such as the determined ONUID (or LLID) (hereinafter collectively referred to as ONU management information). ) Is notified to the PON termination unit 4 that houses the ONU 100 of the registration request source. Also, a process of setting an output destination (to which PON termination unit 4 the frame is output) when the frame addressed to the ONU 100 is received in the frame distribution unit 3 is also executed. Note that once the ONU management unit 2 acquires the ONU management information, the ONU management unit 2 continues to hold the ONU management information even after notifying the PON termination unit 4. Further, it is assumed that the ONU management unit 2 grasps the ONU 100 accommodated in each PON termination unit 4.
- the PON terminal unit 4 Upon receiving the notification of the ONU management information, the PON terminal unit 4 changes the internal setting according to the notified ONU management information, and starts providing a communication service to the ONU 100 that is the registration request source. As a result, the ONU 100 that is the registration request source is in an operating state.
- the ONU management unit 2 uses the ONU management information acquired when the ONU 100 requesting re-registration performs the initial registration.
- the PON termination unit 4 that houses the ONU 100 that is the re-registration request source is notified. That is, when the ONU 100 that has been in operation until then detects a communication failure and changes the wavelength, the ONU management information used by the PON terminator 4 that accommodated the ONU 100 before the wavelength change is changed. Is taken over by the PON terminator 4 that transmits and receives the wavelength (step S24). Further, the ONU management unit 2 sets, in the frame distribution unit 3, an output destination (to which PON termination unit 4 the frame is output) when a frame addressed to the ONU 100 is received.
- the PON terminal unit 4 Upon receiving the notification of the ONU management information, the PON terminal unit 4 changes the internal setting according to the notified ONU management information, and starts providing a communication service to the ONU 100 that is the registration request source.
- the ONU management unit 2 centrally manages information (ONU management information including authentication information, setting band information, LLID, etc.) related to the once connected ONU.
- ONU management information including authentication information, setting band information, LLID, etc.
- the operation when one ONU 100 detects a failure of the optical transmitter on the OLT 1 side has been described.
- the optical transmitter on the OLT 1 side fails, the optical transmitter transmits A plurality of ONUs 100 that are set to receive the wavelengths to be detected detect failures almost simultaneously.
- the ONUs 100 that have detected the failure transmit registration request frames almost simultaneously, and there is a possibility that the frames collide on the wavelength channel. Therefore, for example, the ONU 100 transmits a registration request frame at a timing when a random delay is applied, and suppresses the probability of collision with a registration request frame transmitted by another ONU 100.
- the ONU 100 monitors the frame reception interval from the OLT 1 and switches the transmission / reception wavelength of the optical signal when the frame cannot be received for a certain period of time. It was decided to register. As a result, even if a part of the plurality of optical transmitters included in the OLT 1 fails, the ONU 100 affected by the failure re-establishes a link in another wavelength channel that can be automatically used, Communication can be continued. Further, the OLT 1 manages the ONU management information of the ONU 100 for which the initial registration has been completed in the ONU management unit 2, and if the registration request received from the ONU 100 corresponds to re-registration, the OUN management information that is centrally managed is stored. It was decided to use and re-register. As a result, the time required for the re-registration process can be minimized, and the communication interruption time when a communication failure occurs can be shortened.
- each ONU 100 by the ONU management unit 2 frame transmission / reception processing by the frame distribution unit 3, failure detection processing of the optical transmitter on the OLT 1 side by the communication failure detection unit 101, by the wavelength selection unit 102
- the processing of each component of the OLT 1 and ONU 100, such as the adjustment of the wavelength used for transmission / reception, the frame reception processing by the PON-MAC unit 103, and the control method may be realized by a digital signal processing circuit, a microcomputer, etc. You may implement
- Embodiment 2 FIG. The second embodiment will be described below.
- the system configuration, OLT, and ONU configuration are the same as those in the first embodiment (see FIG. 1).
- the ONU 100 that detects a failure of the optical transmitter on the OLT 1 side shifts the reception wavelength and the transmission wavelength from ⁇ 11 and ⁇ 21 to the long wavelength side step by step.
- new accommodation destinations of the ONUs 100 that have detected the failure are concentrated on a specific PON termination unit 4.
- FIG. 1 consider the case where 32 ONUs 100 are accommodated in the OLT 1 and the accommodation state of the ONUs 100 in a normal state before failure detection is shown in FIG. In FIG.
- the wavelength selection unit 102 of each ONU 100 selects a wavelength stepwise longer, selects a wavelength stepwise shorter, selects randomly.
- Information on the wavelength reselection method at the time of failure detection such as selecting a specific wavelength (predetermining the wavelength to be reselected at the time of failure detection), is individually held.
- selecting a specific wavelength predetermining the wavelength to be reselected at the time of failure detection
- selecting the wavelength longer stepwise means selecting an adjacent wavelength on the long wavelength side of the wavelength used at the time of failure detection (the wavelength used is the long wavelength described in the first embodiment). Shift to the side).
- “Selecting the wavelength in steps shortly” means selecting an adjacent wavelength on the short wavelength side of the wavelength used at the time of failure detection.
- the wavelength reselection method is stored in the ROM of the ONU 100 at the time of shipment, or designated as configuration information from the OLT 1 at the initial connection with the OLT 1 (during the discovery process), and the PON-MAC unit 103 of the ONU 100 To the wavelength selection unit 102.
- the ONU 100 uses one of a plurality of wavelength reselection methods when reselecting a wavelength in accordance with a failure detection. This avoids concentration of reconnected ONUs in other specific wavelength channels after failure of one optical transmitter, and as shown in FIG. 6, the accommodation state of the ONU 100 in the PON termination unit 4 is made uniform to distribute the load. can do.
- Embodiment 3 FIG. Next, a third embodiment will be described.
- the system configuration, OLT, and ONU configuration are the same as those in the first and second embodiments (see FIG. 1).
- the recovery operation in the case where a communication failure occurs due to the failure of the optical transmitter provided in the OLT 1 has been described.
- the optical receiver provided in the OLT 1 fails. A recovery operation when a communication failure occurs will be described.
- each of the PON termination units 4 when not receiving an upstream frame from the accommodated ONU 100 for a certain time, sends a frame instructing the ONU 100 that has not transmitted an upstream frame to return to the initial state. Send.
- FIG. 7 is a flowchart illustrating an operation example of the ONU 100 according to the third embodiment.
- the PON-MAC unit 103 executes initialization (step S32). Specifically, the internal setting is changed to return to the state before executing the discovery process with the OLT 1 (the state in which registration with the OLT 1 is not completed).
- the initialized PON-MAC unit 103 waits for a frame to which a grant for discovery is assigned to register with the OLT 1 (step S33).
- a frame requesting discovery (registration) is transmitted (step S34), and a response to this is sent (step S35).
- the response is received (step S35: Yes)
- the operation is continued and the discovery process is executed (step S38).
- the discovery process is complete, it becomes operational.
- the discovery process is the same as in the first embodiment, that is, the communication failure detection unit 101 determines that the optical transmitter on the OLT 1 side has failed, the wavelength selection unit 102 changes the setting of the optical transmission / reception unit 104, and communication with the OLT 1 is performed. This is the same as the discovery process performed after changing the wavelength used in step 1.
- step S35 when the response to the frame requesting discovery cannot be received within the specified time (step S35: No), the PON-MAC unit 103 indicates that the cumulative value of the number of times the reception of the response to the frame requesting discovery has failed is the specified number of times. It is confirmed whether or not (step S36). If the specified number of times has not been reached (step S36: No), the process returns to step S33 and waits for the transmission of a frame for assigning a discovery grant. When returning to step S33, 1 is added to the cumulative value of the number of times reception of a response to a frame requesting discovery has failed. The addition of 1 to the cumulative value may be performed before the confirmation (comparison between the cumulative value and the specified number) in step S36.
- step S36 determines that the optical receiver on the OLT 1 side has failed, and the wavelength selection unit 102 notifies that fact. To notify. Upon receiving this notification, the wavelength selection unit 102 adjusts the optical transmission / reception unit 104 to set to transmit / receive a wavelength different from the wavelength that has been transmitted / received so far (step S37). If the PON-MAC unit 103 determines that the optical receiver on the OLT 1 side has failed, the PON-MAC unit 103 initializes the above cumulative value (cumulative value of the number of times reception of a response to a frame requesting discovery has failed).
- the PON-MAC unit 103 executes the processing of steps S33 to S38 for the wavelength transmitted and received by the optical transmission / reception unit 104 after the setting change.
- the processing from step S33 to S37 is continued until registration in the OLT 1 is completed and the operation state is obtained.
- the processing in the above steps S35 and S36 that is, monitoring whether or not a response to the discovery request frame transmitted by the PON-MAC unit 103 has been received and counting the number of times the response has failed to be received, and the optical receiver on the OLT 1 side
- the processing for detecting the failure may be performed by the communication failure detection unit 101.
- each ONU 100 that has received an instruction from the OLT 1 to return to the initial state changes a plurality of wavelengths as described in the second embodiment when the wavelength is changed in step S37 described above.
- a predetermined load may be used to distribute the load.
- the OLT 1 operating as follows. That is, when the ONU management unit 2 of the OLT 1 knows the number of ONUs 100 accommodated in each of the PON termination units 4, the registration request frame for requesting the start of the discovery process is received from the PON termination unit 4.
- the number of ONUs accommodated in the PON terminator 4 (hereinafter referred to as the first PON terminator) is compared with the number of ONUs accommodated in the other PON terminators 4 (hereinafter referred to as the second PON terminators), and the first PON terminator is compared.
- the number of ONUs accommodated in the part is larger than the number of ONUs accommodated in the second PON termination part (when there is a second PON termination part with a small number of ONU accommodations), a response to the registration request frame is not returned. To do. As a result, the ONU 100 reselects another wavelength, and a registration request frame is sent by the reselected wavelength. Finally, the ONU 100 is accommodated in the PON terminator 4 having the smallest number of ONUs. In this method, the time required for the entire process of changing the wavelength becomes long, but the number of ONUs accommodated in each PON termination unit 4 can be made uniform.
- the PON terminator 4 of the OLT 1 instructs the ONU 100 to return to the initial state when the uplink frame from the accommodated ONU 100 is not received for a certain period of time.
- the PON-MAC unit 103 of the ONU 100 executes the discovery process, and determines that the optical receiver on the OLT 1 side has failed when the number of continuous discovery failures reaches the specified number. Therefore, it is determined that the wavelength used for communication with the OLT 1 needs to be changed.
- the OLT 1 manages the ONU management information of the ONU 100 for which initial registration has been completed in the ONU management unit 2 and the registration request received from the ONU 100 corresponds to re-registration. Since the re-registration process is performed using the OUN management information that is centrally managed, the time required for the re-registration process can be minimized, and the communication interruption time when a communication failure occurs can be shortened .
- a communication failure has occurred when the number of consecutive failures in receiving a response to a discovery process start request (registration request frame) after receiving an initialization instruction from the OLT 1 reaches a specified number.
- a discovery process start request registration request frame
- Embodiments 1 and 3 described above By applying at least one of Embodiments 1 and 3 described above, fault tolerance can be improved and highly reliable communication can be realized.
- the slave station device, the master station device, the control device, the communication system, and the wavelength switching method according to the present invention use the wavelength channel selected from the plurality of wavelengths by the slave station device and the master station device. This is useful for communication systems that perform communication.
- 1 OLT 1 OLT
- 2 ONU management unit 3 frame distribution unit
- 4 1 , 4 2 , 4 3 , 4 4 PON termination unit 11 to 14,
- 104B optical transmitter 21 to 24,
- 104A optical receiver 31, 32, 33, 105 multiplexing unit, 100 1 , 100 n ONU, 102 wavelength selection unit, 103 PON-MAC unit, 104 optical transmission / reception unit, 200 splitter.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Small-Scale Networks (AREA)
- Optical Communication System (AREA)
Abstract
Description
図1は、本発明にかかる通信システムの構成例を示す図である。本実施の形態では通信システムについて、波長多重PON(Passive Optical Network)システムを例にとり説明するが、発明をPONシステムに限定するものではない。
図1に示すように、波長多重PONシステムは、親局装置として動作するOLT(Optical Line Terminal)1と、光ファイバおよびスプリッタ200を介してOLT1に接続され、子局装置として動作するn台のONU(Optical Network Unit)100(ONU1001,…,100n)とを備える。本実施の形態の波長多重PONシステムは、上り通信および下り通信のそれぞれに4波長を割り当て、各ONU100は、4波長のうちの特定の1波長を使用してOLT1と通信を行う。なお、使用可能な波長を4波長とする構成は一例であり、2波長以上であれば何波長でも構わない。また、各ONU100の内部構成は同一である。図1ではONU1001の内部構成のみを記載し、ONU100nの内部構成については記載を省略している。
図1に示すように、OLT1は、ONU管理部2と、フレーム振り分け部3と、複数のPON終端部4(PON終端部41から44)と、PON終端部4と同数の光送信器(Tx)11から14および光受信器(Rx)21から24と、合波部31から33とを備える。
図1に示すように、ONU100は、通信障害検出部101と、波長選択部102と、PON-MAC部103と、光受信器104Aおよび光送信器104Bを備えた光送受信部104と、合波部105とを備える。
以下、実施の形態2を説明する。なお、システム構成、OLTおよびONUの構成は実施の形態1と同様とする(図1参照)。
次に、実施の形態3を説明する。なお、システム構成、OLTおよびONUの構成は実施の形態1および2と同様とする(図1参照)。
Claims (11)
- 波長が異なる複数の光信号を同時に送信することが可能であるとともに、波長が異なる複数の光信号を同時に受信することが可能な親局装置、と通信する子局装置であって、
前記親局装置が送信可能な複数の光信号の中のいずれか一つを受信するとともに、前記親局装置が受信可能な複数の光信号の中のいずれか一つを送信する光送受信部と、
前記親局装置との通信障害を検出する通信障害検出部と、
前記通信障害検出部が前記通信障害を検出した場合に、前記光送受信部が受信する下り波長および送信する上り波長の設定を変更する波長選択部と、
を備えることを特徴とする子局装置。 - 前記通信障害検出部は、一定期間にわたって前記親局装置からフレームを受信できない場合に通信障害の発生と判断することを特徴とする請求項1に記載の子局装置。
- 前記通信障害検出部は、前記親局装置が定期的に送信する制御フレームを一定時間にわたって受信できない場合に通信障害の発生と判断することを特徴とする請求項2に記載の子局装置。
- 前記通信障害検出部は、前記親局装置に向けて送信された制御フレームに対する応答フレームの受信を規定の回数失敗した場合に通信障害の発生と判断することを特徴とする請求項2または3に記載の子局装置。
- 前記通信障害検出部は、前記親局装置との初期接続手順を規定の回数失敗した場合に通信障害の発生と判断することを特徴とする請求項1から4のいずれか一つに記載の子局装置。
- 前記波長選択部は、前記光送受信部が受信する下り波長および送信する上り波長の設定を変更する際、変更後の波長を、前記親局装置との初期接続手順において指定された、複数の選択方法の中の一つを使用して選択することを特徴とする請求項1から5のいずれか一つに記載の子局装置。
- 1台以上の子局装置を収容し、波長が異なる複数の光信号の中の一つを各子局装置に割り当てて通信する親局装置であって、
それぞれ異なる波長の光信号を使用して子局装置と通信する複数の光終端部と、
各光終端部が収容している子局装置の識別情報と、各子局装置の初期接続処理で各光終端部が設定した内容を示す情報である設定情報とを対応付けて管理する情報管理部と、
を備え、
前記情報管理部は、子局装置からの初期接続要求を光終端部経由で受信した場合、当該子局装置の初期接続処理を過去に実行済かどうかを確認し、過去に実行済の場合には、当該子局装置の識別情報と対応付けられている設定情報を前記初期接続要求を中継した光終端部へ出力することを特徴とする親局装置。 - 波長が異なる複数の光信号を同時に送信することが可能であるとともに、波長が異なる複数の光信号を同時に受信することが可能な親局装置と接続し、前記親局装置が送信可能な複数の光信号の中のいずれか一つを受信するとともに、前記親局装置が受信可能な複数の光信号の中のいずれか一つを送信する光送受信部を用いて通信する子局装置における制御装置であって、
前記親局装置との通信障害を検出する通信障害検出部と、
前記通信障害検出部が前記通信障害を検出した場合に、前記光送受信部が受信する下り波長および送信する上り波長の設定を変更する波長選択部と、
を備えることを特徴とする制御装置。 - 波長が異なる複数の光信号を同時に送信することが可能であるとともに、波長が異なる複数の光信号を同時に受信することが可能な親局装置と、前記親局装置と通信する子局装置とを備えた通信システムであって、
前記子局装置は、
前記親局装置が送信可能な複数の光信号の中のいずれか一つを受信するとともに、前記親局装置が受信可能な複数の光信号の中のいずれか一つを送信する光送受信部と、
前記親局装置との通信障害を検出する通信障害検出部と、
前記通信障害検出部が前記通信障害を検出した場合に、前記光送受信部が受信する下り波長および送信する上り波長の設定を変更する波長選択部と、
を備えることを特徴とする通信システム。 - 前記親局装置は、
それぞれ異なる波長の光信号を使用して子局装置と通信する複数の光終端部と、
各光終端部が収容している子局装置の識別情報と、各子局装置の初期接続処理で各光終端部が設定した内容を示す情報である設定情報とを対応付けて管理する情報管理部と、
を備え、
前記情報管理部は、子局装置からの初期接続要求を光終端部経由で受信した場合、当該子局装置の初期接続処理を過去に実行済かどうかを確認し、過去に実行済の場合には、当該子局装置の識別情報と対応付けられている設定情報を前記初期接続要求を中継した光終端部へ出力することを特徴とする請求項9に記載の通信システム。 - 波長が異なる複数の光信号を同時に送信することが可能であるとともに、波長が異なる複数の光信号を同時に受信することが可能な親局装置、と通信する子局装置における波長切り替え方法であって、
前記親局装置との通信障害を検出する通信障害検出ステップと、
前記通信障害検出ステップで前記通信障害を検出した場合に、前記親局装置が送信可能な複数の光信号の中のいずれか一つを受信する光受信器の受信波長と、前記親局装置が受信可能な複数の光信号の中のいずれか一つを送信する光送信器の送信波長と、を切り替える波長切り替えステップと、
を含むことを特徴とする波長切り替え方法。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/026,186 US9768862B2 (en) | 2013-11-01 | 2013-11-01 | Slave station apparatus, master station apparatus, control device, communication system, and wavelength switching method |
CN201380080548.5A CN105684326A (zh) | 2013-11-01 | 2013-11-01 | 从站装置、主站装置、控制装置、通信系统及波长切换方法 |
PCT/JP2013/079796 WO2015063956A1 (ja) | 2013-11-01 | 2013-11-01 | 子局装置、親局装置、制御装置、通信システムおよび波長切り替え方法 |
JP2015544747A JP6072285B2 (ja) | 2013-11-01 | 2013-11-01 | 親局装置および通信システム |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2013/079796 WO2015063956A1 (ja) | 2013-11-01 | 2013-11-01 | 子局装置、親局装置、制御装置、通信システムおよび波長切り替え方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015063956A1 true WO2015063956A1 (ja) | 2015-05-07 |
Family
ID=53003595
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2013/079796 WO2015063956A1 (ja) | 2013-11-01 | 2013-11-01 | 子局装置、親局装置、制御装置、通信システムおよび波長切り替え方法 |
Country Status (4)
Country | Link |
---|---|
US (1) | US9768862B2 (ja) |
JP (1) | JP6072285B2 (ja) |
CN (1) | CN105684326A (ja) |
WO (1) | WO2015063956A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPWO2016013616A1 (ja) * | 2014-07-24 | 2017-04-27 | 日本電信電話株式会社 | 光通信システム、局側装置、加入者装置及び光通信方法 |
JP2018157527A (ja) * | 2017-03-21 | 2018-10-04 | 日本電信電話株式会社 | 加入者線端局装置及び帯域割当方法 |
CN110446125A (zh) * | 2019-08-27 | 2019-11-12 | 成都华跃科技有限公司 | 光网络系统、光路切换方法、光切换指令下发方法及光分路设备 |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105515772B (zh) | 2014-06-09 | 2020-04-03 | 华为技术有限公司 | 信息处理方法、网络节点、验证方法和服务器 |
US9755746B1 (en) * | 2014-10-03 | 2017-09-05 | Adtran, Inc. | Systems and methods for digitally splitting an optical line terminal across multiple fibers |
US10536237B2 (en) * | 2016-06-20 | 2020-01-14 | Nippon Telegraph And Telephone Corporation | Optical transceiver and control method |
US20200052790A1 (en) * | 2017-03-22 | 2020-02-13 | Sumitomo Electric Industries, Ltd. | Upper device, opposing device, communication system, and communication method |
JP7035391B2 (ja) * | 2017-09-08 | 2022-03-15 | 株式会社安川電機 | 産業用通信システム、産業機器、及び産業用通信方法 |
JP6756688B2 (ja) * | 2017-09-25 | 2020-09-16 | 日本電信電話株式会社 | 光通信システム、波長リソース管理方法及び収容局側装置 |
WO2019239604A1 (ja) * | 2018-06-15 | 2019-12-19 | 三菱電機株式会社 | 制御装置及び信号制御方法 |
JP7317552B2 (ja) * | 2019-04-05 | 2023-07-31 | 日本ルメンタム株式会社 | 光モジュール及び光通信システム |
WO2020261388A1 (ja) * | 2019-06-25 | 2020-12-30 | 日本電信電話株式会社 | 下りフレームの転送装置、転送方法および転送プログラム |
JP7404921B2 (ja) * | 2020-02-19 | 2023-12-26 | 日本電気株式会社 | ネットワーク監視装置およびネットワーク監視方法 |
WO2022087310A1 (en) * | 2020-10-23 | 2022-04-28 | Vubiq Networks, Inc. | Api driven remote radiofrequency front end device and methods of use thereof |
WO2021237229A2 (en) * | 2020-12-09 | 2021-11-25 | Futurewei Technologies, Inc. | Efficient protection switching in wdm-pon |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010034877A (ja) * | 2008-07-29 | 2010-02-12 | Nippon Telegr & Teleph Corp <Ntt> | ポイント−マルチポイントシステムにおける冗長化伝送システム |
JP2011234244A (ja) * | 2010-04-28 | 2011-11-17 | Nippon Telegr & Teleph Corp <Ntt> | 光通信システム及び光通信方法 |
WO2013157171A1 (ja) * | 2012-04-20 | 2013-10-24 | 三菱電機株式会社 | 通信システム、親局装置、子局装置、制御装置、および通信制御方法 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4807200B2 (ja) * | 2006-09-13 | 2011-11-02 | Kddi株式会社 | 光終端システム、光終端ユニット及び切替え方法 |
JP4388556B2 (ja) | 2007-01-09 | 2009-12-24 | 株式会社日立コミュニケーションテクノロジー | パッシブ光ネットワークシステムおよび波長割当方法 |
US20090272151A1 (en) | 2008-04-30 | 2009-11-05 | Maurice Lacasse | Pulling roll material for manufacture of sheet glass |
CN102804701B (zh) | 2009-06-16 | 2015-04-08 | 株式会社日立制作所 | 光多路复用终端装置、波分多路复用无源光网络系统、下行波长发送方法 |
JP2012066038A (ja) | 2010-09-22 | 2012-04-05 | Kiyomi Ishii | 併用まな板 |
US8774621B2 (en) * | 2010-11-25 | 2014-07-08 | Mitsubishi Electric Corporation | Communication line switching method, communication apparatus, station-side communication apparatus, communication system, and control unit |
EP2525517B1 (en) * | 2011-05-20 | 2016-05-04 | ADVA Optical Networking SE | An optical wavelength division multiplex (WDM) transmission system, especially a WDM passive optical network |
JP2013051656A (ja) | 2011-08-31 | 2013-03-14 | Toshiba Corp | 信号処理装置、電子機器、及び信号処理方法 |
JP6219671B2 (ja) * | 2013-10-25 | 2017-10-25 | 日本電信電話株式会社 | 光加入者システム及び通信方法 |
WO2015060325A1 (ja) * | 2013-10-25 | 2015-04-30 | 日本電信電話株式会社 | プロテクション方法及び光通信システム |
-
2013
- 2013-11-01 US US15/026,186 patent/US9768862B2/en not_active Expired - Fee Related
- 2013-11-01 CN CN201380080548.5A patent/CN105684326A/zh active Pending
- 2013-11-01 JP JP2015544747A patent/JP6072285B2/ja not_active Expired - Fee Related
- 2013-11-01 WO PCT/JP2013/079796 patent/WO2015063956A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010034877A (ja) * | 2008-07-29 | 2010-02-12 | Nippon Telegr & Teleph Corp <Ntt> | ポイント−マルチポイントシステムにおける冗長化伝送システム |
JP2011234244A (ja) * | 2010-04-28 | 2011-11-17 | Nippon Telegr & Teleph Corp <Ntt> | 光通信システム及び光通信方法 |
WO2013157171A1 (ja) * | 2012-04-20 | 2013-10-24 | 三菱電機株式会社 | 通信システム、親局装置、子局装置、制御装置、および通信制御方法 |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPWO2016013616A1 (ja) * | 2014-07-24 | 2017-04-27 | 日本電信電話株式会社 | 光通信システム、局側装置、加入者装置及び光通信方法 |
JP2018157527A (ja) * | 2017-03-21 | 2018-10-04 | 日本電信電話株式会社 | 加入者線端局装置及び帯域割当方法 |
CN110446125A (zh) * | 2019-08-27 | 2019-11-12 | 成都华跃科技有限公司 | 光网络系统、光路切换方法、光切换指令下发方法及光分路设备 |
CN110446125B (zh) * | 2019-08-27 | 2024-05-24 | 成都华跃科技有限公司 | 光网络系统、光路切换方法、光切换指令下发方法及光分路设备 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2015063956A1 (ja) | 2017-03-09 |
CN105684326A (zh) | 2016-06-15 |
JP6072285B2 (ja) | 2017-02-01 |
US20160261337A1 (en) | 2016-09-08 |
US9768862B2 (en) | 2017-09-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6072285B2 (ja) | 親局装置および通信システム | |
JP5967744B2 (ja) | 多重波長受動光ネットワークのための波長構成方法および装置、ならびに多重波長受動光ネットワーク・システム | |
US9136968B2 (en) | Time and wavelength division multiplexing—passive optical network (TWDM-PON) system and communication link method thereof | |
US9929827B2 (en) | Wavelength negotiation method and apparatus of multi-wavelength passive optical network, and multi-wavelength passive optical network system | |
US9525507B2 (en) | Method of tuning wavelength in time and wavelength division multiplexing-passive optical network (TWDM-PON) | |
EP3446418B1 (en) | Systems and methods for performing optical line terminal (olt) failover switches in optical networks | |
WO2009012728A1 (fr) | Procédé, appareil et système permettant à une unité de réseau optique d'avoir accès au réseau | |
KR20170102165A (ko) | 다중-파장 수동 광 네트워크에 적용되는 통신 방법, 장치, 및 시스템 | |
JP5556921B1 (ja) | 加入者側装置登録方法及び光ネットワークシステム | |
WO2015113383A1 (zh) | 通道切换方法、装置、光网络单元及时分波分复用系统 | |
CN110391864B (zh) | 无源光网络的通信方法、装置以及系统 | |
WO2016030961A1 (ja) | 子局装置、親局装置、光通信システムおよび異常検出方法 | |
JP5137906B2 (ja) | 光アクセス網、光加入者装置および光アクセス網の通信設定方法 | |
WO2013189321A1 (zh) | 一种无源光网络中的波长调谐方法、系统及设备 | |
EP3130096A1 (en) | Rogue optical network unit mitigation in passive optical networks | |
EP2995024A1 (en) | Method and apparatus for reconfiguring wavelength of optical network unit | |
KR102017882B1 (ko) | 시간 및 파장 분할 다중 - 수동형 광 네트워크에서의 파장 튜닝 방법 | |
CN106464385B (zh) | 一种通信方法、装置及系统 | |
JP2015173384A (ja) | 通信システム、加入者側装置、局側装置および無瞬断切替方法 | |
JP2009200956A (ja) | 加入者側の光送受信装置(onu)および光端局側の光送受信装置(osu)、光端局装置(olt)、ならびにそれらを備えるスター型ネットワーク | |
KR101738722B1 (ko) | 시간 및 파장 분할 다중화 - 수동형 광가입자 망 시스템 및 이의 통신 연결 방법 | |
WO2015022807A1 (ja) | 親局装置、制御装置、通信システムおよび通信方法 | |
JP6178264B2 (ja) | 波長監視方法、波長監視システム及び親ノード | |
WO2015184604A1 (zh) | 波长切换方法、装置和系统 | |
JP2015154211A (ja) | 親局装置、通信システム、通信制御方法および制御装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 13896745 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2015544747 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 15026186 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 13896745 Country of ref document: EP Kind code of ref document: A1 |