WO2012071919A1 - Gpon系统中隔离长发光onu的方法 - Google Patents

Gpon系统中隔离长发光onu的方法 Download PDF

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Publication number
WO2012071919A1
WO2012071919A1 PCT/CN2011/079415 CN2011079415W WO2012071919A1 WO 2012071919 A1 WO2012071919 A1 WO 2012071919A1 CN 2011079415 W CN2011079415 W CN 2011079415W WO 2012071919 A1 WO2012071919 A1 WO 2012071919A1
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Prior art keywords
onu
olt
laser
long
message
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French (fr)
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徐永国
范雨晓
张勇
安俊峰
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Fiberhome Telecommunication Technologies Co Ltd
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Fiberhome Telecommunication Technologies Co Ltd
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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
    • 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 invention relates to a method for guaranteeing service security of a GPON system, and particularly relates to a method for isolating a long-lighting ONU in a GPON system.
  • GPON is a technology that has been rapidly developed in recent years.
  • GPON Gigabit passive optical network
  • the GPON standard provides unprecedented high bandwidth, with a downlink rate of up to 2.5 Gbit/s, and its asymmetric characteristics are more suitable for broadband data services. It provides full service guarantee of QoS, and has good service level, QoS guarantee and full service access capability. With a transmission distance of up to 20 kilometers, it has many features such as high bandwidth, high speed, high efficiency transmission, wide coverage, and rich user interfaces. It has been regarded by most operators as broadband and integrated transformation of access network services. Ideal technology.
  • the upper and lower directions use different working wavelengths, and the operating wavelength range in the downlink direction is 1480 ⁇ 1500nm, generally 1490nm, and the working wavelength range in the uplink direction is 1260-1360 nm, generally 1310nm.
  • the uplink data frame is synchronized with the downlink data frame, and the uplink data stream shares the uplink bandwidth in a time division multiplexing manner.
  • the OLT indicates the allowed position of the uplink data stream in the uplink data frame in units of bytes in the downlink data frame.
  • the OLT sends pointers in the PCBd that indicate the start and end times of each upstream transmission of the upstream data stream.
  • the "flowing" ONU is such an ONU, and the long-emitting ONU is another kind of "rogue" ONU.
  • Long illuminating 0NU means that the faulty laser generator sends an optical signal (continuous or intermittent) to the fiber, or the 0NU SoC has failed (eg: CPU hangs, incorrectly configured transmission time and control in GPON TC circuitry) a phenomenon produced by the signal). If a 0NU laser has a long illuminating phenomenon, all 0NUs on the entire P0N port will not work properly. Therefore, how to automatically detect and isolate the long-illuminated rogue 0NU is very important to ensure the security of the GPON system.
  • the technical problem to be solved by the present invention is to solve the problem of how to automatically detect and isolate the long-emitting ONU in the GPON system, thereby ensuring the service security of the GPON system.
  • the technical solution adopted by the present invention is to provide a method for isolating a long-lighting ONU in a GPON system, comprising the following steps:
  • the OLT periodically queries the serial numbers of all ONUs.
  • the OLT first turns off and then delays turning on all the ONU lasers in the GPON system according to the received serial number of the ONU. After the ONU laser is turned off, the OLT queries the serial numbers of other ONUs, and When the current ONU laser is turned off, the OLT can receive the serial number of the other ONU reply, and obtain the judgment result of whether the current ONU is a long-light ONU. When the judgment result indicates that the ONU is a long-light ONU, the PLOM message is sent. The mode permanently turns off the ONU's laser until all ONUs are completed.
  • step A10 the OLT establishes an authorized ONU table and an online ONU table according to the obtained serial number of the ONU.
  • step A20 the authorized ONU table is traversed first, and all ONUs in the table are first turned off and then delayed. Its laser, if the judgment result indicates that the ONU is authorized If there is no long-emitting ONU in the table, then the online ONU table is traversed, and the ONUs in the table are turned off one by one and then the laser is turned on until all the ONUs are completed.
  • the OLT sends a broadcast PLOAM message, turns off all the lasers of the ONU connected thereto, and then traverses the authorized ONU table. , send a PLOAM message to each ONU in a pair of tables, and turn on its laser.
  • step A10 the following steps are performed before step A10:
  • the OLT detects the working state of the PON port.
  • step B20 Whether the PON port receives the LOS alarm to obtain a judgment result of whether the PON port is in a normal working state, and when the judgment result indicates that the PON port is in a normal working state, the process proceeds to step B10; otherwise, the process proceeds to step B30;
  • step B30 detecting optical power through the RSSI interface, if the detected optical power is 0, then proceed to step B40; otherwise, go to step A10;
  • OLT again query the serial number of the ONU, if the serial number of any ONU cannot be obtained, go to step B50; otherwise, go to step B10;
  • step B50 the optical power is detected again by the RSSI. If the optical power is 0, the process proceeds to step B10; otherwise, the process proceeds to step A10.
  • the process of processing the PLOAM message by the ONU in step A20 is as follows: C10: After receiving the PLOAM message from the OLT, the ONU determines whether the PLOAM message is a DISABLE SN message, and if it is not a DISABLE SN message, ignores the PLOAM message; Otherwise, go to step C20;
  • step C50 If, go to step C30; C30, determining whether the SN of the ONU carried in the PLOAM message is consistent with its own SN, if not, do nothing; otherwise, go to step C40;
  • the isolation of the long-emitting ONU in the GPON system is realized. To ensure the business security of the GPON system.
  • Figure 1 is a flow chart of the OLT discovering the ONU and establishing an online ONU table and authorizing the ONU table;
  • Figure 2 is a flow chart for detecting the working state of the PON port;
  • Figure 3 is a flow chart for isolating the long-lighting ONU
  • Figure 4 is a flow chart of the processing of the Ploam message by the ONU.
  • the present invention provides a method for isolating a long-lighting ONU in a GPON system.
  • the OLT queries the serial numbers of all ONUs in the GPON system according to a certain time interval, and sends a PLAOM message to turn off and delay all ONUs one by one.
  • the OLT starts to query other ONU serial number commands to determine whether the current ONU is a long-emitting ONU based on whether the OLT can receive the serial number of other ONU responses when the current ONU laser is turned off. Judging result, when the judgment result indicates that the ONU is a long-lighting ONU
  • the laser of the ONU is permanently turned off by sending a PLAOM message.
  • a method for isolating a long-lighting ONU in a GPON system includes a process in which an OLT obtains an ONU serial number SN and establishes an online ONU table and an authorized ONU table, a PON port working state detection process, and detects long-lighting.
  • the ONU and isolation process is a three-step process.
  • the OLT obtains the serial number SN of the ONU and establishes the online ONU table and authorizes the ONU table as follows:
  • the OLT In the GPON system, the OLT first queries the serial numbers of all ONUs in the GPON system by sending standard PLOAM messages at a certain frequency. The n ONUs that are online but not activated respond to the PLOAM messages and report their serial numbers SN1, SN2.. .... SNn. The activated ONU will not respond to the SN query message. If there is a long-emitting ONU, there will be no ONU under the PON port. After receiving the serial number of the ONU, the OLT reports it to the NMS. The NMS checks the validity of all reported ONUs one by one, and then determines whether to authorize the ONUs of the corresponding SNs.
  • the SN information of all legal ONUs is saved to the authorized ONU table in the above process (these ONUs may be online or may not be online); the SN information of the currently online ONUs is saved to the online ONU table (these ONUs are online) Some have been authorized, and some may be newly discovered ONUs that have not yet been authorized.
  • the PON port connected to the ONU has three working states: normal working state, abnormal working state, and indeterminate state.
  • the abnormal working status means that the PON port is not working properly, for example, a LOS alarm is generated.
  • the indeterminate state means that the PON port cannot be determined to work normally, for example, the state after all the ONUs are normally offline.
  • the PON port does not need to start the detection process of the long-lighting ONU under normal working conditions, but the normal working state and the uncertain state need to pass.
  • the RSSI optical power detection module is used to determine if there is an ONU online.
  • the PON port working status detection process is shown in Figure 2.
  • the PON port When the PON port is in the normal working state, if an abnormality occurs (such as a LOS alarm is generated), the PON port enters an abnormal working state (the OLT detects the LOS alarm). At this time, the RSSI is started to perform the power of the PON port. Measurement, if the RSSI detects an optical signal, and the PON port at this time is in an abnormal working state, indicating that there may be a long-emitting ONU, it is necessary to start the detection of the long-emitting ONU. If the optical power is 0, the PON port is in an indeterminate state. At this time, the OLT periodically polls the SN of the ONU to see if the SN of the ONU can be obtained or activates the ONU.
  • an abnormality such as a LOS alarm is generated
  • the PON port enters an abnormal working state (the OLT detects the LOS alarm).
  • the RSSI is started to perform the power of the PON port. Measurement, if the RSSI detect
  • the RSSI is started again to check whether the PON port is available. Optical signal; If the ONU can be found, the PON port returns to the normal working state, otherwise it is not the ONU online. To avoid additional CPU overhead, long-light ONU detection is not required for normal operation and for indeterminate states.
  • the long-light ONU detection and isolation are started.
  • the specific steps are shown in Figure 3.
  • the PLOAM message format and ONU status used in the long-lighting ONU detection and isolation process are defined in Table 1 and Table 2. .
  • the method of isolating long-lighting ONUs is as follows:
  • the OLT periodically queries the serial numbers of all ONUs, that is, the OLT periodically issues an instruction for querying the serial numbers of all ONUs in the GPON system through standard PLOAM messages, and establishes an online ONU table and an authorized ONU table.
  • the OLT first turns off and then delays turning on all the ONU lasers in the GPON system according to the received serial number of the ONU. After the ONU laser is turned off, the OLT starts to query other ONU serial number commands, and When the current ONU laser is turned off, the OLT can receive the serial number of the other ONU reply, and obtain the judgment result of whether the current ONU is a long-light ONU. When the judgment result indicates that the ONU is a long-light ONU, The laser of the ONU is permanently turned off by sending a PLAOM message until the detailed steps of completing all the steps A20 are as follows:
  • the OLT first reads the first ONU in the authorized ONU table, and the initial state of the ONU is 01;
  • A202 Send a PLOAM message with a command ID of DISABLE (OxFF) to the ONU according to the SN of the ONU. After receiving the PLOAM message, the ONU returns to the 07 state and turns off the laser.
  • OxFF command ID of DISABLE
  • the OLT issues an instruction for querying the serial numbers of other ONUs through a standard PLAOM message.
  • the OLT Since the ONU that has turned off the laser does not affect the operation of other ONUs, after a delay, if the OLT can obtain the serial number SN of the other ONU reply, it can be determined that the ONU that the laser is turned off is the long-emitting ONU. The OLT then permanently shuts down the laser of the ONU by sending a PLAOM message, and reports the SN of the ONU at the same time, and the detection ends.
  • the OLT still cannot obtain the serial number of other ONU responses after the delay waits, it indicates that there is still a long-emitting ONU in the GPON system, and the ONU that is turned off by the laser is not a long-emitting ONU (because the laser of the ONU is turned off) Since the unknown long-emitting ONU is still emitting light, no serial number SN or activated ONU is found on the OLT side.
  • the OLT sends a PLOAM message with the command ID ENABLE to the ONU, enabling the ONU, turns on the laser that is turned off, and returns it to the 02 state or the 03 state.
  • the OLT continues to read the next ONU in the authorized ONU table, and repeats steps A202-A204 until the long-emitting ONU is found and isolated.
  • the OLT reads the SN of the ONU in the online ONU table, and if the SN is not empty, sends a PLOAM message with the command ID DISABLE for the first ONU in the online ONU table, the ONU The initial state is 01. After receiving the PLOAM message, the ONU returns to the 07 state and turns off its laser. At the same time, the OLT issues a message for querying other ONU serial numbers SN.
  • the OLT can find the ONU or activate the ONU, the ONU whose serial number is SN is a long-lighting ONU.
  • the OLT permanently turns off the laser of the ONU by sending a PLAOM message, and reports the SN of the ONU. If the ONU is not found or the ONU is activated after the delay, the ONU is not a long-emitting ONU.
  • the OLT sends a PLOAM message with the command ID of ENABLE to the ONU, indicating that the ONU is not a long-emitting ONU.
  • the PLOAM message with the command ID of ENABLE is sent, the ONU is enabled, and the laser that is turned off is turned on to return to the 02 state or the 03 state.
  • the SN of the next ONU in the online ONU table is read, until the online ONU table is polled, and the long-emitting ONU is found and isolated.
  • the OLT If no long-lighting ONU is found in the online ONU table and the authorized ONU table, the OLT first sends all the ONUs to the broadcast PLOAM message, and the command ID of the PLOAM message is DISABLE. After all the ONUs receive the PLOAM message, Go back to the 07 state and turn off its laser. Then the OLT traverses the authorized ONU table, and sends a PLOAM message with the command ID ENABLE to each authorized ONU one by one to enable the ONU. After receiving the PLOAM message with the command ID ENABLE, the ONU turns on the laser and starts working, and returns from 07. 02 state, re-ranging, active to 05 state, normal operation. However, this method can only isolate the long-lighted ONU and cannot locate the long-illuminated 0NU serial number. Table 1
  • the ONU After receiving the PLOAM message from the OLT, the ONU first determines whether the PLOAM message is a DISABLE SN message according to the content of the MESSAGE ID in the PLOAM message, and ignores the PLOAM message if it is not a DISABLE SN message; if it is a DISABLE SN message, Go to step C20.
  • step C20 Determine whether the PLOAM is a broadcast message according to the content of the ONU ID in the PLOAM message. If it is a broadcast message, go to step C50; otherwise, go to step C30.
  • the invention is based on the standard PLOAM message implementation.
  • the PLOAM message is a standard defined by G.984.3.
  • the PLOAM message is responsible for implementing ONU registration and ID assignment, ranging, port ID assignment, encryption, status detection, and bit error rate monitoring. During long-lighting ONU detection isolation, the ONU laser is turned on and off by a PLOAM message.

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Description

说 明 书
GPON系统中隔离长发光 ONU的方法 技术领域
本发明涉及保障 GPON系统业务安全的方法， 具体涉及 GPON系统中 隔离长发光 ONU的方法。
背景技术
GPON是近几年迅速发展起来的一种技术, GPON(Gigabit passive optical network)全名为吉比特 /千兆位无源光纤网络， 也是一种无源被动式光纤网 路。 相对于其他的 PON标准而言， GPON标准提供了前所未有的高带宽， 下行速率高达 2.5Gbit/s， 其非对称特性更能适应宽带数据业务。 提供 QoS 的全业务保障， 有很好的提供服务等级、 支持 QoS保证和全业务接入的能 力。 传输距离可达 20公里， 因而具有高带宽、 高速、 高效传输、 大范围覆 盖、用户接口丰富等的众多特点， 已被大多数运营商视为实现接入网业务的 宽带化、 综合化改造的理想技术。
在 GPON系统中，上、下行方向采用不同的工作波长， 下行方向的工作 波长范围为 1480〜1500nm， 一般为 1490nm， 上行方向的工作波长范围为 1260-1360 nm, 一般为 1310nm。 上行数据帧与下行数据帧同步,上行数据流 以时分复用的方式共享上行带宽， OLT在下行数据帧中以字节为单位指示了 上行数据流在上行数据帧中的允许位置。 OLT在 PCBd中发送指针， 这些指 针指示了每个 ONU发送上行数据流的开始和结束时间。 这样在任意时刻只 有一个 ONU可以访问媒质，在正常工作状态下不会发生碰撞。一旦有 ONU 不按照 OLT的带宽映射方式发送数据流，就可能导致整个 PON口都无法工 作。 "流氓 "ONU就是这样的一种 ONU， 而长发光 ONU又是"流氓' ONU的 一种。
长发光 0NU是指有故障的激光发生器发送光信号 （连续或是间断） 到 光纤， 或者 0NU 的 SoC发生了故障 （如： CPU挂起， 错误的配置了传输 时间和 GPON TC circuitry中的控制信号）而产生的一种现象。如果某一 0NU 的激光器有长发光的现象,会导致整个 P0N口上的所有 0NU都不能正常工 作。 因此， 如何自动地检测并隔离长发光的流氓 0NU， 从而保障 GPON系 统的业务安全是非常重要的。
发明内容
本发明所要解决的技术问题是解决 GPON系统中如何自动地检测并隔 离长发光 ONU， 从而保障 GPON系统的业务安全的问题。
为了解决上述技术问题，本发明所采用的技术方案是提供一种 GPON系 统中隔离长发光 ONU的方法， 包括以下步骤：
A10、 OLT周期性查询所有 ONU的序列号；
A20、 OLT根据收到的 ONU的序列号， 通过发送 PLAOM消息的方式， 逐一先关闭再延时打开 GPON系统中所有 ONU的激光器； ONU的激光器 关闭后， OLT查询其他 ONU的序列号，并以当前 ONU的激光器关闭时 OLT 是否可以收到其他 ONU回复的序列号为依据， 获得当前 ONU是否为长发 光 ONU的判断结果， 当判断结果表明该 ONU为长发光 ONU时， 则通过发 送 PLAOM消息的方式永久关闭该 ONU的激光器， 直到完成所有的 ONU。
在上述方法中， 步骤 A10中， OLT根据获得到的 ONU的序列号建立授 权 ONU表和在线 ONU表； 步骤 A20中， 首先遍历授权 ONU表， 对表中 的所有 ONU逐一先关闭再延时打开其激光器，如果判断结果表明授权 ONU 表中没有长发光 ONU时， 则再遍历在线 ONU表， 对表中的 ONU逐一先关 闭再延时打开其激光器， 直到完成所有的 ONU。
在上述方法中， 如果步骤 A20 中的判断结果表明授权 ONU表和在线 ONU表中均没有长发光 ONU时， 则 OLT发送广播 PLOAM消息， 关闭所 有与之相连的 ONU的激光器， 然后遍历授权 ONU表， 逐一对表中的每个 ONU发送 PLOAM消息，打开其激光器。
在上述方法中， 在步骤 A10之前执行以下步骤：
B10、 OLT检测其 PON口的工作状态；
B20、以 PON口是否收到 LOS告警获得该 PON口是否处于正常工作状 态的判断结果，当判断结果表明该 PON口处于正常工作状态，则转步骤 B10; 否则转歩骤 B30;
B30、通过 RSSI接口检测光功率， 如果检测到的光功率为 0， 则转步骤 B40; 否则转步骤 A10;
B40、 OLT再次查询 ONU的序列号， 如果不能获得任一个 ONU的序列 号， 则转步骤 B50; 否则， 转步骤 B10;
B50、 再次通过 RSSI检测光功率， 如果光功率为 0， 则转歩骤 B10; 否 则， 转步骤 A10。
在上述方法中， 步骤 A20中 ONU对 PLOAM消息的处理过程如下： C10、 ONU接收来自 OLT的 PLOAM消息后， 判断该 PLOAM消息是 否为 DISABLE SN消息， 如果不是 DISABLE SN消息， 则忽略该 PLOAM 消息； 否则， 转歩骤 C20;
C20、 判断 PLOAM消息是否为广播消息， 如果是广播消息， 则转步骤
C50; 否则， 转步骤 C30; C30、 判断 PLOAM消息中携带的 ONU的 SN是否与自身的 SN相符， 如果不相符， 则不做任何操作； 否则， 转步骤 C40;
C40、判断 PLOAM消息中的命令 ID是 DISABLE还是 ENABLE,如果 是 ENABLE, 则 ONU打开其激光器， 如果是 DISABLE, 则 ONU关闭其激 光器；
C50、解析 PLOAM消息并获得命令 ID的内容，如果命令 ID是 ENABLE, 则 ONU打开其激光器； 如果是 DISABLE, 则 ONU关闭其激光器。
本发明， 通过关闭 ONU的激光器， 并根据是否可以收到其他 ONU回 复序列号检测出该 ONU是否为长发光 ONU， 对于长发光 ONU并永久关闭 其激光器，从而实现 GPON系统中长发光 ONU的隔离，确保 GPON系统的 业务安全。
附图说明
图 1为 OLT发现 ONU并建立在线 ONU表及授权 ONU表的流程图； 图 2为 PON口工作状态检测流程图；
图 3为隔离长发光 ONU的流程图；
图 4为 ONU对 Ploam消息的处理流程图。
具体实施方式
本发明提供了一种 GPON系统中隔离长发光 ONU的方法， OLT按照一 定的时间间隔査询 GPON系统中所有 ONU的序列号， 并通过发送 PLAOM 消息的方式，逐一对所有的 ONU先关闭再延时打开其激光器； ONU的激光 器关闭后， OLT启动查询其他 ONU序列号指令， 以当前 ONU的激光器关 闭时 OLT是否可以收到其他 ONU回复的序列号为依据， 获得当前 ONU是 否为长发光 ONU的判断结果，当判断结果表明该 ONU为长发光 ONU时则 通过发送 PLAOM消息的方式永久关闭该 ONU的激光器。
下面结合附图对本发明作出详细的说明。
作为本发明的一个较佳的实施例， GPON系统中隔离长发光 ONU的方 法包括 OLT获得 ONU的序列号 SN并建立在线 ONU表及授权 ONU表的过 程、 PON口工作状态检测过程以及检测长发光 ONU并隔离的过程三个步骤。
如图 1所示， OLT获得 ONU的序列号 SN并建立在线 ONU表及授权 ONU表的过程如下：
在 GPON系统中 ,OLT首先以一定的频率通过发送标准 PLOAM消息的 方式査询 GPON系统中所有 ONU的序列号， 在线但未激活的 n个 ONU响 应 PLOAM消息并上报其序列号 SN1、 SN2...... SNn。 激活的 ONU是不会 响应 SN查询消息的。 有长发光 ONU的存在， 该 PON口下就不会有 ONU 处于激活状态。 OLT收到 ONU的序列号后上报给网管， 网管逐一检查所有 上报来的 ONU的合法性,从而决定是否给相应 SN的 ONU授权， 据此， 在 OLT上建立起两张表： 授权 ONU表和在线 ONU表。 所有合法 ONU的 SN 信息在以上过程中被保存到授权 ONU表中 （这些 ONU可能在线， 也有可 能不在线）； 当前在线的 ONU的 SN信息则被保存到在线 ONU表中 （这些 在线的 ONU 中有的已经被授权,有的则可能是新发现的还没有被授权的 ONU)。
与 ONU相连的 PON口有三种工作状态：正常工作状态、非正常工作状 态和不确定的状态。 非正常工作状态指 PON口已不能正常工作， 例如产生 了 LOS告警等； 不确定的状态指不能确定 PON口是否能正常工作， 例如所 有 ONU正常的离线后的状态。 PON口在正常的工作状态下是不需要启动 长发光 ONU的检测处理过程的， 而非正常工作状态和不确定状态则需要通 过 RSSI光功率检测模块来确定是否有 ONU在线。
PON口工作状态检测流程如图 2所示。
当 PON口处于正常工作状态时， 如果产生了异常（比如产生了 LOS告 警等） 则表示 PON口进入到异常工作状态 （此时 OLT检测到 LOS告警）， 此时， 启动 RSSI进行 PON口的功率测量， 如果 RSSI检测到有光信号， 而 此时的 PON口已在异常工作状态，说明可能有长发光 ONU存在，需要启动 长发光 ONU的检测。 如果光功率为 0， 说明 PON口为不确定状态， 此时， OLT再次周期轮询 ONU的 SN， 看是否能够获得 ONU的 SN或激活 ONU, 如果不能， 则再次启动 RSSI査看 PON口有无光信号； 如果能发现 ONU， 则 PON口返回到正常工作状态， 否贝 lj， 说明没有 ONU在线。为避免额外的 CPU开销， 正常工作状态以及不确定状态都不需要进行长发光 ONU检测。
当 PON口处于非正常工作状态时，启动长发光 ONU检测和隔离，具体 步骤如图 3所示， 长发光 ONU检测和隔离过程中所使用的 PLOAM消息格 式及 ONU状态定义参见表 1和表 2。
隔离长发光 ONU的方法如下：
A10、 OLT周期性查询所有 ONU的序列号， 即 OLT通过标准 PLOAM 消息定时发出查询 GPON系统中所有 ONU的序列号的指令， 并建立在线 ONU表及授权 ONU表。
A20、 OLT根据收到的 ONU的序列号， 通过发送 PLAOM消息的方式， 逐一先关闭再延时打开 GPON系统中所有 ONU的激光器； ONU的激光器 关闭后， OLT启动查询其他 ONU序列号指令， 并以当前 ONU的激光器关 闭时 OLT是否可以收到其他 ONU回复的序列号为依据， 获得当前 ONU是 否为长发光 ONU的判断结果，当判断结果表明该 ONU为长发光 ONU时则 通过发送 PLAOM消息的方式永久关闭该 ONU的激光器， 直到完成所有的 步骤 A20的详细步骤如下：
A201、 OLT首先读取授权 ONU表中的第一个 ONU，该 ONU的初始状 态为 01 ;
A202、 以该 ONU的 SN为依据针对该 ONU发送命令 ID为 DISABLE (OxFF) 的 PLOAM消息， ONU收到此 PLOAM消息后， 回到 07状态，关闭 其激光器；
A203、 OLT通过标准的 PLAOM消息发出查询其他 ONU的序列号的指 令；
A204、 由于已经关闭了激光器的 ONU不会影响其它的 ONU工作,延时 一段时间后，如果 OLT能够获得到其他 ONU回复的序列号 SN,则可以判断 出激光器被关闭的 ONU就是长发光 ONU, 于是 OLT再通过发送 PLAOM 消息的方式永久关闭该 ONU的激光器， 同时上报网管该 ONU的 SN， 检测 结束。反之，如果延时等待后， OLT仍不能够获得其他 ONU回复的序列号， 则说明 GPON系统中还存在长发光 ONU， 被关闭了激光器的 ONU不是长 发光的 ONU (因为关闭该 ONU的激光器之后,由于未知的长发光的 ONU还 在长发光，因此，在 OLT端不会发现任何序列号 SN或激活的 ONU)，此时， OLT对这个 ONU发送命令 ID为 ENABLE的 PLOAM消息， 使能该 ONU, 打开其被关闭的激光器， 使之回到 02状态或 03状态。
A205、 OLT继续读取授权 ONU表中的下一个 ONU, 重复歩骤 A202— A204,直到发现并隔离长发光 ONU为止。
如果在授权 ONU表中未发现长发光 ONU,即长发光 ONU是一个未获得 授权的 ONU，则此时需要检测在线表 ONU中的 ONU。与检测授权 ONU类 似， 首先， OLT读取在线 ONU表中的 ONU的 SN,如果 SN不为空， 则针对 该在线 ONU表中的第一个 ONU发送命令 ID为 DISABLE的 PLOAM消息, 该 ONU的初始状态为 01， ONU收到该 PLOAM消息后， 回到 07状态并关 闭其激光器。 同时， OLT发出查询其他 ONU序列号 SN的消息。 同样， 等 待延时后， 如果 OLT可以发现 ONU或激活 ONU， 则说明序列号为 SN的 ONU是长发光 ONU， OLT通过发送 PLAOM消息的方式永久关闭该 ONU 的激光器， 同时上报该 ONU的 SN给网管， 检测结束； 如果等待延时后未 发现 ONU或激活 ONU， 则说明该 ONU不是长发光的 ONU， OLT会对这 个 ONU发送命令 ID为 ENABLE的 PLOAM消息， 则说明该 ONU不是长 发光 ONU, 于是发送命令 ID为 ENABLE的 PLOAM消息， 使能该 ONU, 打开其被关闭的激光器， 使之回到 02状态或 03状态。 之后， 再读取在线 ONU表中下一个 ONU的 SN， 直到轮询完在线 ONU表， 发现长发光 ONU 并将其隔离为止。
如果在线 ONU表和授权 ONU表中均未发现长发光 ONU,则 OLT首先 发给所有的 ONU—个广播的 PLOAM消息， 该 PLOAM消息的命令 ID为 DISABLE,所有的 ONU收到该 PLOAM消息后， 回到 07状态,关闭其激光 器。 然后 OLT遍历授权 ONU表， 逐一对每个已授权的 ONU发送命令 ID 为 ENABLE 的 PLOAM消息,使能 ONU,ONU收到命令 ID为 ENABLE的 PLOAM消息后，打开激光器并开始工作， 从 07回到 02状态， 再测距、 激 活到 05状态， 正常工作。 但这种方法只能隔离长发光的 0NU,不能定位长 发光的 0NU的序列号。 表 1
Figure imgf000011_0001
表 2: ONU状态定义
Onu的状态 定义
01状态 初始状态
02状态 待机状态
03 状态 序列号状态
04状态 测距状态
05状态 运行状态
06状态 POPUP状态
07状态 紧急停止状态 在上述步骤中， ONU对 PLOAM消息的处理过程如图 4所示。
C10、 ONU接收来自 OLT的 PLOAM消息后， 首先根据 PLOAM消息 中的 MESSAGE ID的内容判断该 PLOAM消息是否为 DISABLE SN消息， 如果不是 DISABLE SN消息， 则忽略该 PLOAM消息； 如果是 DISABLE SN消息， 则转步骤 C20。
C20、 根据 PLOAM消息中 ONU ID的内容， 判断 PLOAM是否为广播 消息， 如果是广播消息， 则转步骤 C50; 否则， 转步骤 C30。
C30、 判断 PLOAM消息中携带的 ONU的 SN是否与自身的 SN相符， 如果不相符，则说明此 OLT想要 DISABLE的 ONU并非自身， ONU不做任 何操作； 否则， 说明此消息正是发给自身的， 转步骤 C40。
C40、判断 PLOAM消息中的命令 ID是 DISABLE还是 ENABLE,如果 是 ENABLE, 则 ONU打开其激光器， 如果是 DISABLE, 则 ONU关闭其激 光器。
C50、解析 PLOAM消息并获得命令 ID的内容，如果命令 ID是 ENABLE， 则 ONU打开其激光器； 如果是 DISABLE, 则 ONU关闭其激光器。
本发明基于标准的 PLOAM消息实现， PLOAM消息是 G.984.3定义的 标准， PLOAM消息负责实现 ONU的注册及 ID分配、测距、 Port ID分配、 加密、 状态检测、 误码率监视等功能。 在长发光 ONU检测隔离过程中， 通 过 PLOAM消息控制 ONU激光器的打开和关闭。
本发明不局限于上述最佳实施方式，任何人应该得知在本发明的启示下 作出的结构变化， 凡是与本发明具有相同或相近的技术方案， 均落入本发明 的保护范围之内。

Claims

权 利 要 求 书
1、 GPON系统中隔离长发光 ONU的方法，其特征在于，包括以下步骤： A10、 OLT周期性查询所有 ONU的序列号；
A20、 OLT根据收到的 ONU的序列号， 通过发送 PLAOM消息的方式， 逐一先关闭再延时打开 GPON系统中所有 ONU的激光器； ONU的激光器关 闭后， OLT查询其他 ONU的序列号， 并以当前 ONU的激光器关闭时 OLT 是否可以收到其他 ONU回复的序列号为依据，获得当前 ONU是否为长发光 ONU的判断结果， 当判断结果表明该 ONU为长发光 ONU时， 则通过发送 PLAOM消息的方式永久关闭该 ONU的激光器， 直到完成所有的 ONU。
2、如权利要求 1所述的 GPON系统中隔离长发光 ONU的方法， 其特征 在于， 在步骤 A10中， OLT根据获得到的 ONU的序列号建立授权 ONU表 和在线 ONU表；在歩骤 A20中，首先遍历授权 ONU表，对表中的所有 ONU 逐一先关闭再延时打开其激光器， 如果判断结果表明授权 ONU表中没有长 发光 ONU时， 则再遍历在线 ONU表， 对表中的 ONU逐一先关闭再延时打 开其激光器， 直到完成所有的 ONU。
3、如权利要求 2所述的 GPON系统中隔离长发光 ONU的方法， 其特征 在于， 如果步骤 A20中的判断结果表明授权 ONU表和在线 ONU表中均没 有长发光 ONU时，则 OLT发送广播 PLOAM消息，关闭所有与之相连的 ONU 的激光器， 然后遍历授权 ONU表， 逐一对表中的每个 ONU发送 PLOAM消 息，打开其激光器。
4、如权利要求 1、 2或 3所述的 GPON系统中隔离长发光 ONU的方法， 其特征在于， 在歩骤 A10之前执行以下歩骤：
B10、 OLT检测其 PON口的工作状态；
B20、 以 PON口是否收到 LOS告警获得该 PON口是否处于正常工作状 态的判断结果，当判断结果表明该 PON口处于正常工作状态，则转步骤 B10; 否则转步骤 B30;
B30、 通过 RSSI接口检测光功率， 如果检测到的光功率为 0， 则转步骤 B40; 否则转步骤 A10;
B40、 OLT再次查询 ONU的序列号， 如果不能获得任一个 ONU的序列 号， 则转步骤 B50; 否则， 转步骤 B10;
B50、 再次通过 RSSI检测光功率， 如果光功率为 0， 则转步骤 B10; 否 则， 转步骤 A10。
5、 如权利要求 1至 4项任一项权利要求所述的 GPON系统中隔离长发 光 ONU的方法， 其特征在于， 步骤 A20中 ONU对 PLOAM消息的处理过 程如下：
C10、 ONU接收来自 OLT的 PLOAM消息后，判断该 PLOAM消息是否 为 DISABLE SN消息， 如果不是 DISABLE SN消息， 则忽略该 PLOAM消 息； 否则， 转步骤 C20;
C20、 判断 PLOAM消息是否为广播消息， 如果是广播消息， 则转步骤 C50; 否则， 转步骤 C30;
C30、 判断 PLOAM消息中携带的 ONU的 SN是否与自身的 SN相符， 如果不相符， 则不做任何操作； 否则， 转步骤 C40;
C40、 判断 PLOAM消息中的命令 ID是 DISABLE还是 ENABLE， 如果 是 ENABLE, 则 ONU打开其激光器， 如果是 DISABLE, 则 ONU关闭其激 光器；
C50、解析 PLOAM消息并获得命令 ID的内容，如果命令 ID是 ENABLE, 则 ONU打开其激光器； 如果是 DISABLE, 则 ONU关闭其激光器。
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