WO2013161374A1 - Terminal de ligne optique - Google Patents

Terminal de ligne optique Download PDF

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Publication number
WO2013161374A1
WO2013161374A1 PCT/JP2013/054744 JP2013054744W WO2013161374A1 WO 2013161374 A1 WO2013161374 A1 WO 2013161374A1 JP 2013054744 W JP2013054744 W JP 2013054744W WO 2013161374 A1 WO2013161374 A1 WO 2013161374A1
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WO
WIPO (PCT)
Prior art keywords
management information
unit
management
pon
pon interface
Prior art date
Application number
PCT/JP2013/054744
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English (en)
Japanese (ja)
Inventor
和俊 川上
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Publication of WO2013161374A1 publication Critical patent/WO2013161374A1/fr

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    • 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
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • 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
    • 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
    • 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 station side device (OLT) of a PON (Passive Optical Network) system in which a subscriber side device (ONU: Optical Network Unit) is connected via an optical transmission medium and performs Ethernet (Ethernet / registered trademark) communication.
  • OLT station side device
  • ONU Optical Network Unit
  • Ethernet Ethernet
  • This relates to an OLT in which the active and standby optical transceiver boards (PON interfaces) are redundantly configured 1: 1 in Optical Line Terminal.
  • the PON system is configured by connecting a plurality of ONUs via an optical fiber and an optical splitter to an OLT arranged in a center station.
  • OLT optical fiber
  • optical splitter In the data transmission from the OLT to the ONU, all data is transmitted from the OLT to all ONUs, and the ONU receives only the data transmitted to its own terminal and discards other data.
  • Patent Document 1 discloses a PON system having an N: 1 redundant configuration in which an OLT is provided with one backup optical transceiver panel for N active optical transceiver panels.
  • the N working optical transceiver boards are connected to a plurality of ONUs via the corresponding N optical fibers and optical couplers.
  • data sharing or data synchronization is required because the package of the optical transceiver panel having a redundant configuration is different, but it is devised to switch at high speed without data synchronization.
  • Patent Document 2 discloses a PON system in which an OLT has a 1: 1 redundant configuration of an active optical transceiver and a standby optical transceiver in an optical transceiver panel.
  • an OLT has a 1: 1 redundant configuration of an active optical transceiver and a standby optical transceiver in an optical transceiver panel.
  • the optical transmission / reception unit of the optical transmission / reception board redundant, it is possible to switch the standby optical transmission / reception unit at high speed even if the active optical transmission / reception unit fails, and the service interruption of the subscriber The time is shortened.
  • this configuration since control is performed in the same package, there is no need to synchronize data.
  • the PON system in which the active and standby optical transmission / reception units are redundantly configured in a 1: 1 optical transmission / reception panel, a long service interruption may occur if the optical transmission / reception panel fails. There is sex. For this reason, in order to reduce the service interruption time and increase the reliability, the PON system has a 1: 1 redundant configuration with one active optical transceiver board and one standby optical transceiver board.
  • the conventional method in which the setting for conducting the main signal is performed after the optical link between the ONU and the standby optical transceiver board is established the service interruption is performed.
  • the same setting as the main signal conduction setting performed when the optical link between the active optical transceiver and the ONU is established is set to the standby optical transceiver at the timing set in the active optical transceiver. Also implement.
  • a failure such as a failure is detected in the optical line and the optical transceiver board, the connection path between the ONU and the OLT is simply switched.
  • the present invention has been made to solve the above-described problems. Even in the case where there is no memory and means for direct communication between the optical transceiver boards having a redundant configuration, the optical transceiver boards can be shared.
  • An object of the present invention is to provide an OLT capable of guaranteeing data synchronization.
  • the OLT comprises an active and standby optical transceiver board for transmitting and receiving optical signals to and from the opposite station, and a control board for switching the system of the optical transceiver board.
  • a management number allocating unit that newly assigns the same management number to both optical transceiver boards is provided, and the optical transceiver board receives signals from the opposite station when its own equipment is the active system.
  • the management information related to the opposite station is updated with the management number assigned by the management number assigning unit, and the management information updated by the management information updating unit
  • the management information is notified from the transmission / reception panel and the management information is notified from the other optical transmission / reception panel, if the management number assigned to the management information matches the management number assigned to the device , The management information Performs data synchronization, in the case of disagreement is that a discarding data synchronization section the management information.
  • the present invention since it is configured as described above, it is possible to manage data synchronization based on the management number assigned to the active and standby optical transceiver boards, thereby preventing the occurrence of a state deviation. Even in the case of a configuration in which there is no memory that can be shared between optical transmission / reception panels having a redundant configuration and means for direct communication, data synchronization between the optical transmission / reception panels can be ensured.
  • this is a sequence showing a case where system switching occurs during data synchronization. It is a figure which shows the structure of the optical transmission / reception board in Embodiment 2 of this invention.
  • this is a sequence showing a case where system switching occurs during data synchronization.
  • FIG. 1 is a diagram showing a configuration of a PON system according to Embodiment 1 of the present invention.
  • the PON system includes a plurality of ONUs (opposite stations) 3a to 3c (hereinafter referred to as “unless it is necessary to distinguish”) from an OLT 1 disposed in a center station via an optical splitter 2. (Referred to as ONU3).
  • the optical splitter 2 is a device that branches an optical fiber that is an optical transmission medium for optical signals.
  • the OLT 1 includes a control board 11, an optical splitter 12, and PON interfaces (optical transceiver boards) 13a and 13b.
  • FIG. 1 shows a case where the PON interface 13a is set to ACT (active system) and the PON interface 13b is set to STANBY (standby system).
  • the control board 11 controls the operation of the optical splitter 12 and the PON interfaces 13a and 13b.
  • the internal configuration of the control board 11 will be described later.
  • the optical splitter 12 is a device that branches an optical fiber that is an optical transmission medium for optical signals.
  • the optical splitter 12 is connected to the control board 11 by a control line, and can switch the PON interfaces 13a and 13b to be connected in accordance with control from the control board 11.
  • the PON interfaces 13a and 13b are bases for transmitting and receiving optical signals to and from the ONU 3 via the optical splitter 12.
  • the PON interfaces 13a and 13b are connected to the control board 11 via control lines, and system switching (ACT / STANDBY setting) is performed in accordance with control from the control board 11.
  • system switching ACT / STANDBY setting
  • control board 11 includes a management number assigning unit 111 and a system switching unit 112.
  • the management number assigning unit 111 newly assigns the same management number to both the PON interfaces 13a and 13b when the base is started up and when the system of the PON interfaces 13a and 13b is switched by the system switching unit 112. .
  • the system switching unit 112 causes the PON interfaces 13a and 13b to perform system switching when a failure is detected by the failure detection unit 132 of the active PON interface.
  • the PON interface 13 a includes a management information update unit 131, a failure detection unit 132, a management information notification unit 133, and a data synchronization unit 134.
  • the management information update unit 131 updates the management information related to the ONU 3 with the latest management number assigned by the management number assigning unit 111 in accordance with the link up from the ONU 3 when the own device is the active system. To do.
  • the failure detection unit 132 detects a failure when the own device is an active system. Here, when detecting a failure, the failure detection unit 132 notifies the system switching unit 112 of the control infrastructure 11 to that effect.
  • the management information notification unit 133 notifies synchronization data indicating the management information updated by the management information update unit 131 to the other PON interface.
  • the synchronization data is assigned the same management number as the management information.
  • the data synchronization unit 134 compares the management number assigned to the synchronization data with the management number assigned to the own device, If they match, the synchronization data is used to synchronize the management information. If they do not match, the synchronization data is discarded.
  • the system switching unit 112 of the control board 11 first outputs a control instruction 1121 to the optical splitter 12 to switch the connection destination of the optical splitter 12.
  • the optical splitter 12 switches the connection destination from the PON interface 13a shown in FIG. 1 to the PON interface 13b shown in FIG.
  • the system switching unit 112 of the control board 11 changes the setting of the PON interface 13a from ACT to STANDBY by outputting a switching control instruction 1122 to the PON interface 13a.
  • the system switching unit 112 of the control board 11 outputs a switching control instruction 1123 to the PON interface 13b to change the setting from STANDBY to ACT.
  • the system switching can be completed.
  • the PON interface 1003a of the OLT 100 is set to ACT and the PON interface 1003b is set to STANBY as an initial state.
  • the ONU 3 performs link-up with respect to the PON interface 1003a set to ACT in the OLT 100.
  • the PON interface 1003a updates management information such as a MAC address based on the information of the ONU 3 (step ST501).
  • the PON interface 1003a performs conduction setting for the ONU 3 (step ST502).
  • the PON interface 1003a performs data synchronization with the PON interface 1003b set to STANBY in order to enable system switching (step ST503).
  • the updated management information is sent as synchronization data via the control board 1001.
  • the PON interface 1003b updates the management information based on the synchronization data.
  • the PON interface 1003a indicates that the failure has been detected with respect to the control board 1001 in preference to this synchronous data notification. Notification (failure detection notification) is performed (step ST504). Therefore, in this case, since synchronous data notification is interrupted, data synchronization by the PON interface 1003b is not performed.
  • control board 1001 that has received the failure detection notification outputs a switching control instruction for changing the setting to STANBY to the PON interface 1003a in preference to other processes (step ST505).
  • the PON interface 1003a changes the setting from ACT to STANDBY.
  • the control board 1001 outputs a switching control instruction for changing the setting to the ACT to the PON interface 1003b (step ST506).
  • the PON interface 1003b changes the setting from STANDBY to ACT.
  • the ONU 3 performs link-up with respect to the PON interface 1003b newly set to ACT.
  • the management information is updated in response to the link up from the ONU 3 (step ST507).
  • the synchronization processing of the OLT 1 will be described with reference to FIG. First, the synchronization process at the normal time will be described.
  • the PON interface 13a is set to ACT and the PON interface 13b is set to STANBY as an initial state.
  • the management information updating unit 131 of the PON interface 13a updates the management information such as the MAC address based on the information of the ONU 3 (step ST603).
  • the PON interface 13a performs continuity setting for the ONU 3 (step ST604).
  • the management information notification unit 133 of the PON interface 13a performs data synchronization with the PON interface 13b set to STANBY in order to enable system switching (step ST605).
  • the data synchronization unit 134 of the PON interface 13b set to STANBY compares the management number assigned to the synchronization data from the PON interface 13a set to ACT with the management number assigned to the own device. To do.
  • the management information is updated (step ST606).
  • the management information updated in the PON interface 13a set in the ACT is updated to the PON interface 13b set in the STANBY. However, it can be updated and data synchronization can be performed.
  • step ST701 to step 705 shown in FIG. 7 is the same as the processing from step ST601 to step 605 shown in FIG.
  • the failure detection unit 132 when a failure is detected by the failure detection unit 132 of the PON interface 13a during transmission of the synchronization data, the failure detection unit 132 gives priority to the control infrastructure 11 over this synchronization data notification. Notification (failure detection notification) indicating that a failure has been detected is performed (step ST706). Therefore, in this case, since synchronous data notification is interrupted, data synchronization by the PON interface 13b is not performed.
  • the system switching unit 112 of the control board 11 that has received the failure detection notification outputs a switching control instruction for changing the setting to STANBY to the PON interface 13a in preference to other processing (step ST707).
  • the system switching unit 112 of the control board 11 outputs a switching control instruction for changing the setting to ACT to the PON interface 13b set to STANBY (step ST708).
  • the ONU 3 performs link-up with respect to the PON interface 13b newly set to ACT.
  • the management information update unit 131 of the PON interface 13b newly set to ACT has not updated the management information in advance, the management information is updated in response to a link up from the ONU 3 (step ST709).
  • the management information notification unit 133 of the PON interface 13a synchronous data notification that has been postponed by the above-described system switching is performed.
  • the data synchronization unit 134 of the PON interface 13b set to STANBY compares the management number assigned to the synchronization data from the PON interface 13a set to ACT with the management number assigned to the own device. To do.
  • each PON interface 13a, 13b Since the management number is updated to a new management number, it is possible to detect and discard a message that causes a state mismatch, and to ensure data synchronization between the redundantly configured PON interfaces 13a and 13b.
  • FIG. 8 is a diagram showing a configuration of the PON interface 13a according to the second embodiment of the present invention.
  • the PON interface 13a in the second embodiment shown in FIG. 8 is obtained by adding a reset unit 135 to the PON interface 13a in the first embodiment shown in FIG.
  • Other configurations are the same, and the same reference numerals are given and description thereof is omitted.
  • the internal configuration of the PON interface 13b is the same as that of the PON interface 13a, and the description thereof is omitted.
  • the reset unit 135 stops the data synchronization by the data synchronization unit 134 and resets the ONU 3 when there is a link up from the ONU 3 during the data synchronization by the data synchronization unit 134.
  • FIG. 9 shows a case where the data synchronization of the PON interfaces 13a and 13b and the link up of the ONU 3 intersect.
  • the difference from the synchronization processing of the first embodiment shown in FIG. 7 is that the synchronization data is first notified before the link-up of the ONU 3 (step ST905). Then, data synchronization and link-up of ONU 3 compete (step ST909).
  • the system switching unit 112 of the control infrastructure 11 issues a switching control instruction to the PON interfaces 13a and 13b, respectively (steps ST907 and 908). Thereafter, when the synchronization data is notified from the management information notification unit 133 of the PON interface 13a, the data synchronization unit 134 of the PON interface 13b starts data synchronization (step ST909). However, the linkup from the ONU 3 is performed immediately thereafter, so that the reset unit 135 of the PON interface 13b performs the management information update triggered by the data synchronization notification and the management performed triggered by the linkup of the ONU3.
  • the data synchronization by the data synchronization unit 134 is stopped and the ONU 3 is reset (step ST910). Thereafter, in the ONU 3, after resetting, the PON interface 13b set in ACT is linked up again. Therefore, the management information update unit 131 of the PON interface 13b can update the management information with the link up from the ONU 3 as a trigger.
  • the data synchronization is stopped and the ONU 3 is reset. Even in the case of contention with link-up, it is possible to prevent the occurrence of state inconsistency and to ensure data synchronization between the redundantly configured PON interfaces 13a and 13b.
  • the OLT according to the present invention is configured such that the same management number is assigned when the system is switched from the active system to the standby system, and data synchronization is performed based on the management numbers assigned to the active and standby optical transceiver boards. Therefore, even if the configuration does not include a memory that can be shared between redundant optical transceiver panels and means for direct communication, the data between the optical transceiver boards can be managed. Since synchronization can be ensured, it is suitable for use in an OLT in which the active and standby optical transmission / reception panels have a redundant configuration of 1: 1.
  • 1 OLT 1 OLT
  • 2 Optical splitter 3, 3a-3c ONU (opposite station)
  • 11 Control board 12 Optical splitter, 13a, 13b Optical transceiver board (PON interface), 111 Management number assignment unit, 112 system switching unit, 131 management Information update unit, 132 failure detection unit, 133 management information notification unit, 134 data synchronization unit, 135 reset unit.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Small-Scale Networks (AREA)

Abstract

L'invention concerne un tableau de commande (11) comprenant une unité d'attribution de numéros de gestion (111) qui attribue, à un temps de transfert du système, le même numéro de gestion à des interfaces PON (13a et 13b). Chaque interface PON (13a et 13b) comprend : une unité de mise à jour d'informations de gestion (131) qui, avec l'établissement d'une liaison à partir d'une ONU (3), ajoute un numéro de gestion aux informations de gestion à partir de l'ONU (3) et ensuite qui met à jour les informations de gestion ; une unité de notification d'informations de gestion (133) qui notifie l'autre interface PON des informations de gestion ; et une unité de synchronisation de données (134) qui réalise une synchronisation de données pour les informations de gestion qui ont été notifiées à celle-ci si le numéro de gestion des informations de gestion susmentionnées correspond au numéro de gestion pour l'interface PON dont l'unité de synchronisation de données est une composante, et qui détruit les informations de gestion susmentionnées s'il n'existe pas de correspondance.
PCT/JP2013/054744 2012-04-24 2013-02-25 Terminal de ligne optique WO2013161374A1 (fr)

Applications Claiming Priority (2)

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JP2012098852A JP2015130543A (ja) 2012-04-24 2012-04-24 Ｏｌｔ
JP2012-098852 2012-04-24

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017143537A1 (fr) * 2016-02-24 2017-08-31 华为技术有限公司 Terminal de ligne optique, et procédé de mise a niveau de dispositif maître et de dispositif esclave

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003244179A (ja) * 2002-02-15 2003-08-29 Mitsubishi Electric Corp 光多分岐通信システム、加入者装置および局内装置
JP2007036926A (ja) * 2005-07-29 2007-02-08 Kddi Corp 光終端システム
JP2008072370A (ja) * 2006-09-13 2008-03-27 Kddi Corp 光終端システム、光終端ユニット及び切替え方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003244179A (ja) * 2002-02-15 2003-08-29 Mitsubishi Electric Corp 光多分岐通信システム、加入者装置および局内装置
JP2007036926A (ja) * 2005-07-29 2007-02-08 Kddi Corp 光終端システム
JP2008072370A (ja) * 2006-09-13 2008-03-27 Kddi Corp 光終端システム、光終端ユニット及び切替え方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017143537A1 (fr) * 2016-02-24 2017-08-31 华为技术有限公司 Terminal de ligne optique, et procédé de mise a niveau de dispositif maître et de dispositif esclave
US10929150B2 (en) 2016-02-24 2021-02-23 Huawei Technologies Co., Ltd. Optical line terminal and method for upgrading primary device and secondary device of optical line terminal

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