CN1479460A - Passive optical network protection method - Google Patents

Passive optical network protection method Download PDF

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CN1479460A
CN1479460A CN 03128899 CN03128899A CN1479460A CN 1479460 A CN1479460 A CN 1479460A CN 03128899 CN03128899 CN 03128899 CN 03128899 A CN03128899 A CN 03128899A CN 1479460 A CN1479460 A CN 1479460A
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optical
pon
lt
protection
fiber
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CN1258270C (en
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赵焕东
曾庆济
池灏
刘华
王云
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上海交通大学
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Abstract

The protection system is composed of optical line terminal, work optical fiber, protection optical fiber, 2X2 optical branching device and work optical fiber network unit. The optical line terminal includes control module, PON-LT work module, PON-LT protection module and 2X2 optical switch. The control module possesses function of judging system crash. Based on diverse kinds of system crash, method of switching optical switch and protecting optical fiber can be utilized. Or, RTT data of PON-LT protection module round trip time measured in advance as well as corresponding optical network unit number ONU-ID data are copied in order to cancel procedure of distance measurement. Moreover, compensation and computed correction are carried out for new added optical network unit number data and corresponding round trip time. The procedure of distance measurement is also canceled, and rising speed for resuming protection of system.

Description

无源光网络保护方法 Passive optical network protection method

技术领域 FIELD

:本发明涉及一种无源光网络的保护方法,系统发生故障时能在电信级保护时间内恢复正常,属于光通信技术领域。 : The present invention relates to a method for protecting a passive optical network, to return to normal level within a telecommunication system failure protection time belongs to the field of optical communication technology.

一个典型的无源光网络系统由光线路终端、光网络单元、光分路器组成。 A typical system consists of a passive optical network optical line terminal, an optical network unit, an optical splitter composition. 光线路终端放在中心机房,光网络单元放在网络接口单元附近或与其合为一体。 The optical line terminal at the center of the room, placed close to the optical network unit or network interface unit as one therewith. 光分路器是无源光纤分支器,是一个连接光线路终端和光网络单元的无源设备,它的功能是分发下行数据并集中上行数据。 Optical splitter is a passive optical splitter is a passive device and an optical line terminal connected to an optical network unit, its function is to distribute the downlink data and the uplink data is centralized. 无源光网络的传输方案是以1310nm波长区传送窄带业务信号,以1550nm波长区传送宽带业务信号。 Transmission scheme is based on a passive optical network 1310nm wavelength transmitted narrowband signals to 1550nm wavelength transmitted broadband signal. 无源光网络的主要传输技术有频分复用(FDM)、时分复用(TDM)和密集波分复用(DWDM)等多种方式,目前,使用比较多的是基于时分复用的。 Main transmission technology with a passive optical network using frequency division multiplexing (FDM), time division multiplexed (TDM) and dense wavelength division multiplexing (DWDM) and other ways, at present, more use is based on time division multiplexing. 在下行方向采用时分复用技术,上行方向执行时分复用相关接入协议。 Time-division multiplexing, time division multiplexing the relevant uplink access protocol performed in the downlink direction. 上行方向上的给定时刻只允许一个用户传输。 Given time only one user can transmit in the upstream direction. 实际网络中,由于不同光网络单元光支路的传输时延不同,不同光网络单元的光电、电光转换及处理时间不同,以及由于系统环境温度的变化及器件老化等原因导致的传输时延会变化,都会导致不同光网络单元发出的信号在光线路终端处发生上行信号的冲突,为此在无源光网络中采用了多点控制协议(MPCP,Multi-Point Control Protocol)以及测距技术。 Actual network, different transmission delays due to the different optical tributary of the optical network unit, a photoelectric different optical network units, the different optical conversion and processing time and temperature due to changes in the system environment and aging device causes transmission delay will changes will lead to conflict uplink signal a signal emitted from different optical network units occurred in the optical line terminal, using a large multi-point control protocol (MPCP, multi-point control protocol) and a ranging in a passive optical network technology.

在实际应用中,对光缆或故障的保护变得非常重要。 In practice, it becomes very important to protect the cable or failures. 故障主要分为线路与终端,终端包括光线路终端及光网络单元。 Fault line and divided into a terminal, the terminal comprising an optical line terminal and the optical network unit.

G.983.3中提出了四种保护方法,其中第二种方法主要有工作光线路终端,光线路终端内包括PON-LT(无源光网络线路终端)工作模块、PON-LT保护模块,工作光纤,保护光纤,2×N光分路器,工作光网络单元,其中,PON-LT保护模块采用冷备份方案。 G.983.3 four protection method is proposed, wherein the second methods are mainly working optical line terminal, the optical line terminal comprises PON-LT (passive optical network line terminal) work module, PON-LT protection module working fiber , protects the optical fibers, 2 × N optical splitter, an optical network unit of work, wherein, PON-LT protection module using cold backup scheme. 来自工作光线路终端的信号依次经过工作光纤、2×N光分路器,最后进入工作光网络单元。 Signal from the optical line terminal sequentially work through working fiber, 2 × N optical splitter, and finally into the working optical network units.

当工作光线路终端与2×N光分路器间的工作光纤失效时,冷备份的PON-LT保护模块被激发,同时与之相连的保护光纤被启用,来自PON-LT保护模块的信号依次经过保护光纤、2×N光分路器,最后进入工作光网络单元。 When the working fiber between the working optical line terminal and 2 × N optical splitter failure, PON-LT cold backup protection module is excited, while the protected optical fiber connected thereto is activated, the signal from the PON-LT protection module sequentially after protection of the optical fiber, 2 × N optical splitter, and finally into the working optical network units. 由于,冷备份的PON-LT保护模块中的信号发射模块被激发到正常工作状态需要一段较长的时间(>50ms),同时,当光终端或光线路发生失效,系统启用了备份的PON-LT保护模块及光纤后,由于工作和保护PON-LT模块光线路终端存在着差异,为了保证无源光网络的上行信号同步,必需对系统中的所有光网络单元进行重测距过程,测量各个光网络单元的往返时间(RTT),重测距也是一个耗费系统时间资源的过程,所以这种保护结构在系统出现故障时不能实现电信级<50ms的保护倒换时间。 Since, PON-LT protection in cold backup module signal transmitter module is activated to normal operation takes a long time (> 50ms), while, when the light or the optical line terminal failure occurs, the backup system enabled PON- LT protection module and an optical fiber, due to working and protection PON-LT module there are differences in the optical line terminal, in order to ensure the uplink synchronization signal PON, it is necessary for all the optical network units in the system will be re-ranging process, measurements of various round trip time (RTT) of the optical network unit, a weight ranging system is a time-consuming process resources, so this structure does not protect the carrier-class <50ms protection switching time in the event of system failure.

为实现这样的目的,本发明首先在现有技术的基础上对保护系统作了改进,主要由光线路终端,工作光纤,保护光纤,2×N光分路器,工作光网络单元组成。 To achieve this object, the present invention firstly been improved protection system on the basis of prior art, mainly by the optical line terminal, an optical fiber work, protection fiber, 2 × N optical splitter, the optical network units of work. 光线路终端内包括控制模块、PON-LT工作模块、PON-LT保护模块和2×2光开关。 The optical line terminal comprises a control module, PON-LT work module, PON-LT protection module and a 2 × 2 optical switch. 控制模块具有系统失效判断功能,针对光纤失效采用切换光开关到保护光纤的方法,针对PON-LT工作模块失效或两者同时失效的情况,采用拷贝事先测量好的PON-LT保护模块往返时间RTT数据及对应的光网络单元序号ONU-ID数据来取消测距过程,并对新增的光网络单元的序号数据及对应的往返时间进行补偿及计算修正,同样也取消了光网络单元的测距过程,加快系统的恢复保护速度。 The control module has a system failure determining function, the method for the failure protection optical fiber to the optical switch is switched, the case of failure or failure of both the working modules for PON-LT, for copying the pre-measured PON-LT protection module the RTT data and the corresponding optical network unit ONU-ID number data to cancel the ranging process, the round trip time and the number corresponding to the new data and the optical network unit and to compensate for calculating the correction, the distance measuring light also canceled network unit process, speed up the recovery speed protection system.

本发明改进的保护系统中,控制模块连接PON-LT工作模块和PON-LT保护模块,PON-LT工作模块和PON-LT保护模块分别连接到2×2光开关的两个输入端口,2×2光开关的两个输出端口分别与工作光纤、保护光纤相连,工作光纤与相连保护光纤分别连接到2×N光分路器的两个输入端口,2×N光分路器的N个输出端口通过光纤与工作光网络单元相连。 Improved protection system of the present invention, the control module and the PON-LT work modules PON-LT protection module, the operating module and the PON-LT PON-LT protection module is connected to two input ports 2 × 2 optical switch, 2 × 2 two output ports of the optical switch respectively working fiber, the optical fiber is connected to the protection, connected to the working fiber and protection fiber are respectively connected to the 2 × N optical splitter two input ports, N 2 × N outputs of the optical splitter working port connected through an optical fiber optical network unit.

系统正常工作时,来自PON-LT工作模块的光信号分别经过2×2光开关,工作光纤,2×N光分路器和光纤到达工作光网络单元。 When the system is working properly, the optical signal from the PON-LT operating module respectively through 2 × 2 optical switches, working fiber, 2 × N optical splitter and the optical fiber reaches the optical network unit of work. 此处,控制模块负责接收来自PON-LT工作模块、PON-LT保护模块和2×2光开关的光信号并负责发出控制信号,控制模块具有系统失效判断功能,并根据失效不同做出不同的保护恢复动作。 Here, the control module is responsible for receiving from the PON-LT work module, the protection module and the PON-LT 2 × 2 optical switch optical signals and for issuing a control signal, the control module having a system failure determining function, and to make different according to different failure protection and restoration action.

在无源光网络系统中,每一个光网络单元ONU分配一个ONU序号(ONU-ID),为了保证上行信号同步,在无源光网络系统安装过程或新光网络单元添加过程中,控制模块均会测量出每个光网络单元的往返时间RTT,这些往返时间包括在PON-LT工作模块下的往返时间RTT1和在PON-LT保护模块下的往返时间RTT2,根据往返时间RTT1和往返时间RTT2计算出往返时间差RTT2-1,将往返时间RTT1及其对应的ONU-ID1、返时间RTT2及其对应的ONU-ID2、往返时间差RTT2-1等数据存储在控制模块的内存中,以便在执行保护恢复时提高速度。 In a passive optical network system, each optical network unit ONU is assigned a number ONU (ONU-ID), in order to guarantee the uplink signal synchronization, adding a passive optical network system installation process or the new ONU, the control module will measure the RTT of each optical network unit, the round trip time in the round trip time comprises PON-LT work module in the round trip time RTT1 and PON-LT protection module RTT2, calculated according to the round trip time RTT1 and the round trip time RTT2 RTT2-1 round trip time difference, the round trip time RTT1 its corresponding ONU-ID1, corresponding ONU-ID2, round trip time RTT2 time difference and the like RTT2-1 control data stored in the memory module, in order to perform protection and restoration accelerate.

当控制模块仅接收到工作光纤失效的告警信号时,控制模快对2×2光开关发出切换命令,2×2光开关切换到保护光纤,将PON-LT工作模块与保护光纤接通,这时,来自PON-LT工作模块的光信号分别经过2×2光开关,保护光纤,2×N光分路器和光纤到达工作光网络单元。 When the control module receives only a working fiber failure alert signal, the control module issues a fast 2 × 2 optical switch command, 2 × 2 optical switch is switched to the protection fiber, the PON-LT working and protection fiber module is turned on, which , the optical signal from the PON-LT operating module respectively through 2 × 2 optical switch, the optical fiber protection, 2 × N optical splitter and the optical fiber reaches the optical network unit of work. 在这一过程中无需启动冷备份的PON-LT保护模块。 In this process, without having to start PON-LT protection module cold backup.

当控制模块接收到PON-LT工作模块失效的告警信号或又同时收到工作光纤失效的告警信号时,控制模块用当前的ONU-ID及其对应的RTT值刷新内存中的往返时间RTT1表及其对应的ONU-ID1表,然后,对照当前ONU-ID及保存于内存中的往返时间RTT2表中的ONU-ID,一一对应,用保存于内存中的往返时间RTT2表更新当前的RTT表,如发现ONU-ID表中没有的ONU-ID,说明这些光网络单元ONU是后来新增的,其对应的RTT值可以通过公式(RTT)j=(RTT1)j-(RTT2-1)来计算,其中j为新增的光网络单元ONU序号。 When the control module receives the alarm signal PON-LT fails or the operating module and the alarm signal is received while the working fiber failure, the control module with the current ONU-ID and the RTT value corresponding to the refresh memory table and the round trip time RTT1 ONU-ID1 corresponding table, then the control current ONU-ID and stored in the memory of the round trip time RTT2 ONU-ID in the table, one to one, with memory stored in the round trip time RTT2 table update the current RTT table , found ONU-ID ONU-ID not in the table, indicating that these optical network unit ONU is added later, the corresponding value of RTT may be by the formula (RTT) j = (RTT1) j- (RTT2-1) calculation, where j is the new number of the optical network unit ONU. 计算好的(RTT)j添加到当前的RTTT表中。 The calculated (RTT) j RTTT added to the current list. 接着,控制模块启动PON-LT保护模块收发数据。 Next, the control module activates PON-LT protection module send and receive data. 通过以上过程,可以取消测距过程,节省了大量的时间,加快了系统的恢复保护速度。 Through the above process, you can cancel ranging process, saving a lot of time to speed up the recovery speed protection system.

本发明提出的这种新的保护系统及保护方法具有显著的效果。 The present invention proposes new methods of protection and the protection system has a significant effect. 本发明针对光纤失效采用了切换光开关到保护光纤的简单方法,针对其他的失效情况,采用拷贝事先测量好的往返时间(RTT)以及对应的光网络单元ONU序号(ONU-ID)数据来取消测距过程,同时,对于新增的光网络单元ONU的(ONU-ID)及对应的往返时间(RTT)进行补偿及计算修正,同样也取消了光网络单元ONU的测距过程,快速而有效地对系统进行了保护。 The present invention is for an optical fiber using a simple method fails to protect the fiber of the optical switch to switch, for the other failure condition, for copying the pre-measured round-trip time (RTT) and the corresponding optical network unit ONU number (ONU-ID) data to cancel ranging process, while the new optical network unit for the ONU (ONU-ID) and the corresponding round-trip time (RTT) for calculating the correction and compensation, also abolished the ranging process of the optical network unit ONU, fast and efficient the system is protected.

图2为工作光纤(5)失效时,系统恢复保护后的工作流程示意图。 Figure 2 is when the working fiber (5) fails, the workflow system schematic view of the recovery protection.

图3为本发明控制模块的控制保护流程图。 3 is a flowchart of control and protection control module of the present invention.

图1是本发明保护系统结构示意图。 1 is a schematic structure of the protection system of the present invention. 系统主要由光线路终端(1),工作光纤(5),保护光纤(6),2×N光分路器(7),工作光网络单元(8),光纤(9)组成。 The system mainly consists of an optical line terminal (1), working fiber (5), to protect the fiber (6), 2 × N optical splitter (7), operation of the optical network unit (8), an optical fiber (9) components. 光线路终端(1)内包括控制模块(2)、PON-LT工作模块(3)、PON-LT保护模块(4)和2×2光开关(10),控制模块(2)通过控制线连接着PON-LT工作模块(3)和PON-LT保护模块(4),PON-LT工作模块(3)和PON-LT保护模块(4)分别连接到2×2光开关(10)的两个输入端口,2×2光开关(10)的两个输出端口分别与工作光纤(5)、保护光纤(6)相连,工作光纤(5)与保护光纤(6)分别连接到2×N光分路器(7)的两个输入端口,2×N光分路器(7)的N个输出端口通过光纤(9)与工作光网络单元(8)相连。 The optical line terminal (1) comprises a control module (2), PON-LT working modules (3), PON-LT protection module (4) and a 2 × 2 optical switch (10), a control module (2) is connected via a control line a PON-LT working modules (3) and PON-LT protection module (4) working modules PON-LT (3) and PON-LT protection module (4) are respectively connected to the 2 × 2 optical switch (10) of the two an input port, 2 × 2 optical switch (10) and two output ports are working fiber (5), to protect the fiber (6) is connected to the working fiber (5) to protect the optical fiber (6) are respectively connected to the 2 × N optical passage (7) of the two input ports, 2 × N optical splitter (7) of the N output ports are connected through an optical fiber (9) and the operation of the optical network unit (8). 系统正常工作时,来自PON-LT工作模块(3)的光信号分别经过2×2光开关(10),工作光纤(5),2×N光分路器(7),光纤(9)到达工作光网络单元(ONU)(8),图中的点划线表示的是正常系统的工作光信号轨迹。 When the system normal operation, an optical signal from the PON-LT working modules (3) respectively through 2 × 2 optical switch (10), working fiber (5), 2 × N optical splitter (7), an optical fiber (9) to the working optical network unit (ONU) (8), a dashed line indicates the normal working optical signal track systems.

图2为工作光纤(5)失效时,系统恢复保护后的工作流程图,其恢复保护动作过程主要如下:控制模块(2)监测到工作光纤(5)断路,将2×2光开关(10)切换到保护光纤(6)。 Figure 2 is when the working fiber (5) fails, the recovery operation flowchart protection system recovery protection operation process mainly as follows: a control module (2) to monitor the working fiber (5) breaking the 2 × 2 optical switch (10 ) is switched to the protection fiber (6). 保护倒换后,来自PON-LT工作模块(3)的光信号分别经过2×2光开关(10),保护光纤(6),2×N光分路器(7),光纤(9)到达工作光网络单元(8)。 After protection switching, the optical signal from the PON-LT working modules (3) respectively through 2 × 2 optical switch (10), to protect the fiber (6), 2 × N optical splitter (7), an optical fiber (9) to the work an optical network unit (8). 在这一过程中无需启动冷备份的PON-LT保护模块(4)。 In this process without having to start the PON-LT cold backup protection module (4). 系统完成恢复保护过程后,将进行ONU的重测距过程。 After completion of the recovery system protection process, the re-ranging process of the ONU. 图2中的点划线表示的是系统恢复保护后光信号的轨迹。 Dot chain line in FIG. 2 represents the trajectory of the optical signal recovery protection system.

图3本发明控制模块(2)的控制保护流程图。 Figure 3 of the present invention the control module (2) protection control flowchart.

在无源光网络PON系统中,每一个光网络单元ONU分配一个ONU序号(ONU-ID),为了保证上行信号同步,在无源光网络系统安装过程或新光网络单元添加过程中,控制模块(2)均会测量出每个光网络单元的往返时间RTT,这些往返时间RTT包括在PON-LT工作模块下的往返时间RTT1和在PON-LT保护模块下的往返时间RTT2,并计算出往返时间差RTT2-1,这些数据存储在内存中,以便保护恢复时提高速度。 A passive optical network PON system, the optical network unit ONU for each ONU is assigned a number (ONU-ID), in order to guarantee the uplink signal synchronization, a passive optical network system installation process or the process of adding new ONU, the control module ( 2) will measure the RTT of each optical network unit, the round trip time RTT comprises a round trip time in the PON-LT work module RTT1 and the round trip time in the PON-LT protection module RTT2, and calculates the round-trip time difference RTT2-1, in memory, in order to increase protection and restoration speed data is stored.

流程图解析如下:第1步,控制模块的保护程序开始工作。 Flowchart interpreted as follows: Step 1, the control module to work saver.

第2步,从光线路终端OLT获得监控信号数据。 Step 2, the monitor signal to obtain data from the optical line terminal OLT.

第3步,通过监控信号判断系统是否正常工作,如果是,回到第1步,如果否,到第4步。 Step 3, by monitoring whether the signal determining system work normally, if yes, go back to step 1, if not, to step 4.

第4步,判断系统失效的种类:光纤断路或PON-LT工作模块失效或两者同时失效。 Step 4 type, determination of system failure: fiber disconnection or failure PON-LT operating module failure, or both.

第5步,因为是光纤断路,切换光开关至备用保护光纤,到第9步。 Step 5, because the optical fiber is disconnected, the optical switch is switched to the standby protection fiber, to step 9.

第6步,PON-LT工作模块失效或两者同时失效,启动备份PON-LT保护模块,拷贝当前的RTT数据,将内存中的RTT1表更新。 Step 6, PON-LT both operating module failure or failure to start the backup PON-LT protection module, a copy of the current data RTT, RTT1 the memory table update.

第7步,数据复制与修正过程。 Step 7, data replication and revision process. 用保存于内存中的往返时间(RTT2)表更新当前的RTT表,依据ONU-ID表一一对应,如发现(ONU-ID)表中没有的ONU-ID,说明这些ONU后来新增的,其对应的RTT可以通过公式(RTT2)j=(RTT1)j-(RTT2-1)来计算,计算好的(RTT2)j添加到当前的RTT表中。 Stored in memory with the round-trip time (RTT2) table updates the current RTT table, one to one basis ONU-ID table, if found ONU-ID (ONU-ID) not in the table, indicating that these ONU later added, corresponding RTT can be calculated by the formula (RTT2) j = (RTT1) j- (RTT2-1), the calculated (RTT2) j to the current RTT of the table.

第8步,控制模块启动备份的PON-LT保护模块收发数据。 Step 8, the control module activates the backup PON-LT protection module send and receive data.

第9步,系统恢复正常工作,到第1步。 Step 9, the system returned to normal work, to the first step.

本发明采用改进的保护系统及相应的恢复保护方法,能保证系统实现电信级的恢复保护时间,从而提高电信业务的服务质量。 The present invention is the improved protection system and the corresponding recovery protection methods, to ensure quality of service recovery system to achieve carrier-grade protection time, thereby improving the telecommunication services. 当系统发生工作光纤断路时,光线路终端(OLT)无需通过丢弃仍能正常工作的ONU-LT而启用冷备份ONU-LT保护模块的方式达到快速保护恢复,如果采用冷备份ONU-LT,保护模块启动稳定过程需要一个校长的时间(秒量级),而这种方案从恢复保护时间上能达到电信级的恢复要求(<50毫秒)。 When the system working fiber disconnection occurs, the optical line terminal (OLT) by dropping still work without the ONU-LT enabled ONU-LT cold backup protection module way to achieve fast protection and restoration, if ONU-LT cold backup, protection module startup process takes a time to stabilize the principal (order of seconds), and this recovery scheme from the guard time to achieve recovery of the carrier-class (<50 ms).

Claims (1)

1.一种无源光网络保护方法,其特征在于采用的保护系统由光线路终端(1),工作光纤(5),保护光纤(6),2×N光分路器(7),工作光网络单元(8),光纤(9)组成,光线路终端(1)内包括控制模块(2)、PON-LT工作模块(3)、PON-LT保护模块(4)和2×2光开关(10),控制模块(2)通过控制线连接PON-LT工作模块(3)和PON-LT保护模块(4),PON-LT工作模块(3)和PON-LT保护模块(4)分别连接到2×2光开关(10)的两个输入端口,2×2光开关(10)的两个输出端口分别与工作光纤(5)、保护光纤(6)相连,工作光纤(5)与保护光纤(6)分别连接2×N光分路器(7)的两个输入端口,2×N光分路器(7)的输出端口通过光纤(9)与工作光网络单元(8)相连;当控制模块(2)仅接收到工作光纤(5)失效的告警信号时,对2×2光开关(10)发出切换命令,将PON-LT工作模块(3)与保护光纤(6)接通;当控制模块(2)接收到PON-LT工作模块(3)失效的告警信号或又 1. A passive optical network protection method, characterized in that the protective system employed by the optical line terminal (1), working fiber (5), to protect the fiber (6), 2 × N optical splitter (7), the working an optical network unit (8), an optical fiber (9), with an optical line terminal comprises a control module (2), PON-LT working modules (3), PON-LT protection module (4) and a 2 × 2 optical switch (1) (10), a control module (2) connected to PON-LT working modules (3) and PON-LT protection module (4) via a control line, PON-LT working modules (3) and PON-LT protection module (4) are connected the 2 × 2 optical switch (10) of the two input ports, 2 × 2 optical switch (10) and two output ports are working fiber (5), to protect the fiber (6) is connected to the working fiber (5) and the protective fibers (6) are respectively connected to 2 × N optical splitter (7) of the two input ports, output 2 × N optical splitter (7) is connected via an optical fiber ports (9) and the optical network unit of work (8); when the alarm signal control module (2) receives only the working fiber (5) fails, to issue a handover command 2 × 2 optical switch (10), the PON-LT working modules (3) to protect the optical fiber (6) is turned on ; control module (2) receives the operating module when the PON-LT (3) or fail alarm signal and 同时收到工作光纤(5)失效的告警信号时,用当前的ONU-ID及其对应的RTT值刷新内存中的往返时间RTT1表及其对应的ONU-ID1表,然后,对照当前ONU-ID及保存于内存中的往返时间RTT2表中的ONU-ID,一一对应,用保存于内存中的往返时间RTT2表更新当前的RTT表,如发现ONU-ID表中没有的ONU-ID,说明这些光网络单元ONU是后来新增的,其对应的RTT值通过公式(RTT)j=(RTT1)j-(RTT2-1)来计算,其中j为新增的光网络单元ONU序号,计算好的(RTT)j添加到当前的RTT表中,接着,控制模块(2)启动PON-LT保护模块(4)收发数据。 When the alarm signal is received while the working fiber (5) failure of the refresh memory and the round trip time RTT1 ONU-ID1 table corresponding to the table with the current RTT value corresponding to ONU-ID and, then, against the current ONU-ID and stored in the memory of the round trip time RTT2 ONU-ID in the table, one to one, with memory stored in the round trip time RTT2 table update the current RTT table, found ONU-ID ONU-ID not in the table, described the optical network unit ONU is added later, the corresponding value of RTT is calculated by the equation (RTT) j = (RTT1) j- (RTT2-1), where j is the new number of the optical network unit ONU, calculate the (RTT) RTT J added to the current list, then the control module (2) start PON-LT protection module (4) send and receive data.
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