[go: up one dir, main page]

WO2012119490A1 - Procédé et système pour protéger un réseau optique passif - Google Patents

Procédé et système pour protéger un réseau optique passif Download PDF

Info

Publication number
WO2012119490A1
WO2012119490A1 PCT/CN2012/070691 CN2012070691W WO2012119490A1 WO 2012119490 A1 WO2012119490 A1 WO 2012119490A1 CN 2012070691 W CN2012070691 W CN 2012070691W WO 2012119490 A1 WO2012119490 A1 WO 2012119490A1
Authority
WO
WIPO (PCT)
Prior art keywords
port
optical network
new
state
network unit
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2012/070691
Other languages
English (en)
Chinese (zh)
Inventor
郭浩
欧阳海明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZTE Corp
Original Assignee
ZTE Corp
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 ZTE Corp filed Critical ZTE Corp
Publication of WO2012119490A1 publication Critical patent/WO2012119490A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • H04B10/032—Arrangements for fault recovery using working and protection systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27—Arrangements for networking
    • H04B10/272—Star-type networks or tree-type 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
    • H04Q11/0062—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
    • 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 passive optical network, and in particular, to a method and system for protecting a passive optical network. Background technique
  • Passive Optical Network is a pure medium network that can avoid the electromagnetic interference and lightning impact of external equipment, reduce the faults of lines and external equipment, improve system reliability, and save maintenance costs. The technology that the maintenance department has long expected.
  • Passive optical networks mainly include Gigabit Passive Optical Network (GPON), Ethernet Passive Optical Network (EPON), Next Generation Passive Optical Network (NGPON), and Wavelength Division Multiplexed Passive Optical Network (WPON).
  • PON protection mainly uses protection between different ports on the same network element.
  • PON protection is realized by simultaneously managing two PON ports.
  • the following describes GPON as an example to describe the existing methods for implementing PON protection.
  • the information of the working port and the protection port are related to each other, and can be managed by one protection group.
  • the optical network unit (ONU or ONT) connected to the working port or protection port is faulty or in a state. When changing, it can be synchronized to the associated port in real time, so that the status of the working port and the protection port can be managed at the same time.
  • the protection port When the ONU under the working port enters the active state or the deacitve state, the protection port is notified to record the status of the ONU. When a switchover occurs, the protection port sends a broadcast POPUP message to the ONU, informing the ONU to enter the ranging state, and then performing ranging on multiple ONUs in the actvie state. The successor or failure, the broadcast POPUP message is sent again, and then the next An ONU ranging is performed until the ONU is successfully measured. The difference between the backbone fibers is calculated, and the equalization delay (EqD) of all the ONUs is obtained, and then EqD is sent.
  • EqD equalization delay
  • the OLT obtains the Round-Trip Delay (RTD) of the ONU through the measurement process, so as to specify an appropriate Eqd value, so as to ensure that each ONU does not generate a rush on the optical splitter when transmitting data, and proposes an inter-network.
  • RTD Round-Trip Delay
  • Meta-protection method there is currently no passive optical network A method of implementing cross-network element protection.
  • the object of the present invention is to realize cross-network element protection of a passive optical network, which satisfies the requirements of fast, stable and reliable PON protection switching.
  • the present invention provides a method for protecting a passive optical network, including: after the primary port and the standby port establish a connection with the optical network unit, the port state is detected, and when the port alarm is detected, The primary port and the alternate port are interleaved between an open state and a closed state, and when the port alarm disappears, the primary port and the standby port maintain their current open or closed states, wherein the open port is open.
  • the port in the closed state becomes the new standby port; and the new primary port synchronizes the information of the optical network unit to the new standby port through the optical network unit.
  • the step of switching between the active port and the standby port in the open state and the closed state includes: when the primary port and the standby port detect the port alarm, if the current port is open, the port is closed, if the current port is closed In the state, the port is opened, and after a time value is turned on or off, the switching is turned on and off.
  • the time value of the primary port and the standby port being opened and closed each time is a reference time length plus a random time length.
  • the information of the optical network unit includes status information and equalization delay parameters of the optical network unit.
  • the new primary port uses the optical network unit as an information transmission intermediary, and sends the information of the ONU in the activated state under the new primary port.
  • the sending by the optical network unit of the new active port, a physical layer operation and maintenance management (Ploam) message, where the equalization delay parameter is carried in the Ploam message; and the active state is activated.
  • Ploam physical layer operation and maintenance management
  • the optical network unit After receiving the Ploam message, the optical network unit sends an acknowledgement message of the Ploam message to the new primary port and the new alternate port.
  • the present invention further provides a protection system for a passive optical network, including a primary optical line terminal, a backup optical line terminal, and an optical network unit, wherein the primary optical line ends An active port is disposed on the end, and the standby optical line terminal is configured with a standby port, where the primary port and the standby port are respectively used to establish a connection with the optical network unit;
  • the port state is detected.
  • the interlace is switched between the open state and the closed state, and when the port alarm is found to disappear, Keeping their current open or closed state, wherein the port in the open state becomes the new primary port, and the port in the closed state becomes the new standby port, and the new primary port passes the information of the optical network unit through the optical network unit. Synchronize to the new alternate port.
  • the primary port and the standby port are switched between an open state and a closed state by: when the primary port and the standby port detect a port alarm, if the current port is open, the port is closed, and if the port is currently closed In the state, the port is opened, and after a time value is turned on or off, the switching is turned on and off.
  • the time value of each of the primary port and the standby port being opened and closed each time is a reference time length plus a random time length.
  • the information of the optical network unit includes status information and equalization delay parameters of the optical network unit.
  • the new primary port synchronizes the information of the optical network unit to the new standby port by: sending the information of the ONU in the activated state under the new primary port to the new standby by using the optical network unit as an information transmission intermediary.
  • the port includes: sending a physical layer operation and maintenance management (Ploam) message to the optical network unit under the new active port, and carrying the equalization delay parameter in the Ploam message; and the optical network in the activated state After receiving the Ploam message, the unit sends an acknowledgement message of the Ploam message to the new primary port and the new alternate port.
  • Ploam physical layer operation and maintenance management
  • the present invention controls the state of the PON port according to the alarm information of the PON port, performs state switching of the PON port, and synchronizes the ONU information of the two PON ports through the ONU.
  • the ONU information that needs to be synchronized includes the state of the ONU and the Eqd. Such information, so as to achieve fast switching across network elements, using the method of the present invention, can quickly and efficiently achieve fast switching across the OLT.
  • BRIEF abstract 2 is a flowchart of a protection method in a GPON according to an example of the present invention
  • FIG. 3 is a structural diagram of a protection system of a passive optical network according to an embodiment of the present invention. Preferred embodiment of the invention
  • the protection port is not clear about the working state of the ONU.
  • the real-time synchronization of the ONU state cannot be achieved between the working port and the protection port. After the switchover, the ONU cannot recover quickly. Therefore, to perform fast switching, it is necessary to ensure that the ONU status of the working port and the protection port are synchronized with the Eqd. If it is not synchronized, the entire ONU should be re-ranged during the ranging process after the switching, which will cause the ONU to drop.
  • the state of the PON port is controlled according to the alarm information of the PON port, and the state of the PON port is switched, and the ONU information of the two PON ports is synchronized by the ONU, and the ONU information includes information such as the state of the ONU and Eqd, thereby implementing inter-networking. Quick switching of yuan.
  • FIG. 1 is a method for implementing passive optical network protection according to an embodiment of the present invention, including:
  • Step 101 The port state detection is performed on the PON port.
  • a port alarm such as an LOS (drop) alarm
  • the PON port is switched between switch states, and when the switch is switched, the on and off states are maintained for a time value.
  • the opening and closing states of the working port and the protection port are staggered for a period of time until the ONU is found, and the alarm is restored;
  • the PON port in the open state can send a message to the ONU and can receive the ONU to send
  • the PON port in the closed state can only receive the message sent by the ONU.
  • the PON port in the closed state can discover the ONU by receiving the message of the ONU, and determine the state of the port according to whether the ONU message is received within the specified time, and generate the LOS. Alarms, etc.
  • Step 102 After the ONU is online, the current working port periodically sends ONU information to the ONU, and the ONU sends the received ONU information to the connected working port and the protection port.
  • the active port P1 of the primary optical line terminal (OLT1) in the GPON is used as the working port
  • the standby port P2 of the standby optical line terminal (OLT2) is used as the protection port as an example to further illustrate the embodiment of the present invention, including:
  • Step 201 When P1 and P2 detect the LOS state, OLT1 and OLT2 enter the protection switching state, and OLT1 and OLT2 use the time window shown in Table 1 to open the optical module to find the ONU.
  • the opened PON port serves as the working port.
  • the closed PON port acts as a protection port;
  • Tl ⁇ Tn represents a specified reference time length
  • Al ⁇ n represents a random time length
  • the random time length taken each time it is opened and closed may be different.
  • the OLT detects the LOS status if the status of the port of the OLT is on, the port is closed (OFF) and turned on (ON) according to OLT1, and the port is first closed, and the closing time is ⁇ 1+ ⁇ 1 ( ⁇ 1 indicates random Take the time value, the value of each time can be different).
  • the OLT detects the LOS status and the port status is OFF the port is opened and closed according to OLT2.
  • the port is first closed, and the closing time is ⁇ 1+ ⁇ 1 ( ⁇ 1 indicates random time value, each time taken. Values can be different).
  • the downlink optical signal can be ensured that the downlink optical signal does not collide for a certain period of time, that is, one port is in an open state and one port is in a closed state.
  • the OLT1 and the OLT2 have discovered the ONU at the T1 time.
  • the OLT1 and the OLT2 enter the non-LOS state. Since the PON port of the OLT2 is opened during the T1 time period, the OLT2 enters the active working state, and the OLT1 enters the standby working state.
  • the PON port that enters the active working state and the standby working state is no longer switched on and off according to the method in Table 1, but remains in the state.
  • the opened PON port continues to accept other ONUs to go online and starts forwarding services at the same time;
  • the downlink transmission is always turned off, and only the uplink optical signal is received, and the state of the backbone optical fiber is detected.
  • Step 202 After the establishment of the Optical Network Unit Management and Control Channel (OMCC) of the PON port as the active working port, the physical layer operation and maintenance management including the Eqd value is sent to all ONUs of the PON port.
  • OMCC Optical Network Unit Management and Control Channel
  • Step 203 After receiving the Ploam message, the ONU sends an acknowledgement message to the Ploam message to the working port and the protection port, where the Eqd value is carried in the confirmation message.
  • the ONU responds to the Ploam message only when it is in the 05 state. Therefore, after receiving the acknowledgement message of the Ploam message, the protection port can know that the ONU is in the 05 state and can know the Eqd value from the message.
  • Eqd can be synchronized in a timed manner to ensure synchronization between the working port and the protection port.
  • the message number of the PLOAM message defined in this embodiment is 0x89, and the specific structure of the PLOAM message is shown in Table 2:
  • the port status is detected.
  • the interlace switches between the open state and the closed state, and when the port alarm disappears, the respective port is maintained.
  • the current open or closed state where the open port is the new primary port, and the closed port is the new standby port.
  • the new primary port passes the information of the active optical network unit under the local port through the corresponding optical network.
  • the unit returns to the new standby port; the information of the optical network unit includes status information and equalization delay parameters of the optical network unit.
  • the primary port and the alternate port are interleaved between the open state and the closed state as follows. Change: When the port alarm is detected on the primary port and the backup port, if the port is currently open, the port is closed. If the port is currently closed, the port is opened, and after a time value is turned on or off, the switch is turned on and off. The time value of the active port and the standby port being opened and closed may be different. The time values for opening and closing are the base time length plus the random time length.
  • the new primary port sends the Ploam message to the optical network unit, and sends the information of the optical network unit to the optical network unit in the manner that the Ploam message carries the equalization delay parameter; the optical network unit in the activated state receives the specific After the Ploam message, the acknowledgment message of the Ploam message is sent to the new primary port and the new alternate port, and the acknowledgment message also includes the equalization delay parameter, and the new standby port receives the acknowledgment message and parses the message to obtain the new lord. Use the port information.
  • modules and steps of the present invention can be implemented by a general computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or their Multiple modules or steps are implemented as a single integrated circuit module. Thus, the invention is not limited to any particular combination of hardware and software.
  • the present invention controls the state of the PON port according to the alarm information of the PON port, and synchronizes the ONU information of the two PON ports, including the status of the ONU and the Eqd, through the ONU, thereby achieving fast cross-network elements. Switching, using the method of the present invention, a fast switching across the OLT can be implemented simply and efficiently.

Landscapes

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

Abstract

L'invention concerne un procédé et un système pour protéger un réseau optique passif (PON). Le procédé comprend les étapes suivantes: un port primaire et un port de réserve, après l'établissement de la connexion avec une unité de réseau optique (ONU), détectent l'état de port ; lors de la détection d'une alarme de port, les deux ports commutent alternativement entre l'état MARCHE et l'état ARRET ; et lors de la découverte de l'ONU, gardent l'état MARCHE ou ARRET respectif actuel, le port dans l'état MARCHE devient le nouveau port primaire, et le port dans l'état ARRET devient le nouveau port de réserve ; et le nouveau port primaire synchronise des informations de l'ONU sur le nouveau port de réserve grâce à l'ONU. L'invention contrôle l'état d'un port PON selon les informations d'alarme de celui-ci, réalise la commutation d'état du port PON, et met en œuvre, grâce à une ONU, la synchronisation des informations d'ONU des ports PON primaire et de réserve, les informations d'ONU comprenant des informations telles que l'état de l'ONU et de l'Eqd, mettant ainsi en œuvre une commutation rapide d'élément inter-réseau.
PCT/CN2012/070691 2011-03-04 2012-01-21 Procédé et système pour protéger un réseau optique passif Ceased WO2012119490A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201110053491.2A CN102104424B (zh) 2011-03-04 2011-03-04 一种无源光网络的保护方法及系统
CN201110053491.2 2011-03-04

Publications (1)

Publication Number Publication Date
WO2012119490A1 true WO2012119490A1 (fr) 2012-09-13

Family

ID=44156980

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2012/070691 Ceased WO2012119490A1 (fr) 2011-03-04 2012-01-21 Procédé et système pour protéger un réseau optique passif

Country Status (2)

Country Link
CN (1) CN102104424B (fr)
WO (1) WO2012119490A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102104424B (zh) * 2011-03-04 2014-12-10 中兴通讯股份有限公司 一种无源光网络的保护方法及系统
CN104768086B (zh) * 2014-01-07 2018-06-15 上海诺基亚贝尔股份有限公司 光网络单元间相互通信的方法及装置
CN109672472A (zh) * 2019-01-30 2019-04-23 新华三技术有限公司 主备用端口确定方法及装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6632032B1 (en) * 1998-04-07 2003-10-14 At&T Corp. Remote data network access in a communication network utilizing overhead channels
CN101282586A (zh) * 2008-05-15 2008-10-08 杭州华三通信技术有限公司 无源光网络中的光纤故障检测方法、系统及装置
CN101656573A (zh) * 2009-09-07 2010-02-24 中兴通讯股份有限公司 无源光网络业务保护的方法及光线路终端
CN101826916A (zh) * 2009-03-02 2010-09-08 大唐移动通信设备有限公司 Ir口主备倒换方法、系统及设备
CN201667657U (zh) * 2010-04-14 2010-12-08 东南大学 光收发模块保护型波分复用无源光网络光线路终端
CN102104424A (zh) * 2011-03-04 2011-06-22 中兴通讯股份有限公司 一种无源光网络的保护方法及系统

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6632032B1 (en) * 1998-04-07 2003-10-14 At&T Corp. Remote data network access in a communication network utilizing overhead channels
CN101282586A (zh) * 2008-05-15 2008-10-08 杭州华三通信技术有限公司 无源光网络中的光纤故障检测方法、系统及装置
CN101826916A (zh) * 2009-03-02 2010-09-08 大唐移动通信设备有限公司 Ir口主备倒换方法、系统及设备
CN101656573A (zh) * 2009-09-07 2010-02-24 中兴通讯股份有限公司 无源光网络业务保护的方法及光线路终端
CN201667657U (zh) * 2010-04-14 2010-12-08 东南大学 光收发模块保护型波分复用无源光网络光线路终端
CN102104424A (zh) * 2011-03-04 2011-06-22 中兴通讯股份有限公司 一种无源光网络的保护方法及系统

Also Published As

Publication number Publication date
CN102104424A (zh) 2011-06-22
CN102104424B (zh) 2014-12-10

Similar Documents

Publication Publication Date Title
TWI430594B (zh) 用於乙太網路被動光學網路中之保護切換的方法及系統
US8538261B2 (en) Immediate protection scheme for passive optical network
US9179204B2 (en) Optical network system
CN102884807B (zh) 通信线路切换方法、通信装置、站侧通信装置、通信系统以及控制装置
JP5236069B2 (ja) 光加入者終端装置、ｐｏｎシステムおよび異常検出方法
US8917990B2 (en) Fast protection scheme for passive optical network
KR101961053B1 (ko) 불량 광 네트워크 유닛을 검출하는 방법, 장치 및 시스템
CN102377479B (zh) 数据同步方法及系统、光网络单元
CN103227966B (zh) Pon中的透明保护切换操作
JP4913865B2 (ja) 光通信ネットワークシステム、親局光通信装置、光通信方法および通信プログラム
WO2010031326A1 (fr) Procédé de commutation de liaison de données dans un système de réseau optique, borne de ligne optique et système de réseau optique
WO2010111923A1 (fr) Procede de protection de reseau optique passif, dispositif et systeme de commande de commutateur de mise en attente maitre
WO2012119439A1 (fr) Procédé de communication de données dans un système de réseau optique, unité de réseau optique et système de réseau optique
WO2015113383A1 (fr) Procédé et appareil de changement de canal, unité de réseau optique et système de multiplexage par répartition en temps et en longueur d'onde
WO2011038591A1 (fr) Procédé, dispositif et système de commutation maître-secours dans un réseau optique passif (pon)
CN102611519A (zh) 一种对无源光网络进行链路保护的方法和装置
CN103125095B (zh) 基站侧装置和pon系统
WO2012097538A1 (fr) Procédé et système destinés à mettre en œuvre un mode de protection intégral
JP2009065341A (ja) Ｐｏｎシステム
WO2012119490A1 (fr) Procédé et système pour protéger un réseau optique passif
JP5640877B2 (ja) 通信システム、親局装置および通信回線切替方法
WO2012022163A1 (fr) Procédé et système permettant de mettre en œuvre une synchronisation d'estampilles temporelles entre un terminal de ligne optique principal et un terminal de ligne optique en veille
JP6372345B2 (ja) 局側通信装置、受動型光ネットワークシステムおよび再登録処理方法
WO2013187098A1 (fr) Système de transmission optique, dispositif formant terminal optique sur le côté bureau, et procédé pour la commutation d'un circuit de communication
JP5730443B2 (ja) 光伝送システム、局側光終端装置および通信回線切替方法

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: 12755021

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12755021

Country of ref document: EP

Kind code of ref document: A1