CN100542072C - Test methods for faults in passive optical networks - Google Patents

Abstract

Translated fromChinese

一种无源光网络故障的测试方法和装置，通过1)分别启动光线路终端测试模块和光网络终端测试模块；2)由光线路终端测试模块在N个光网络终端侧中选择第i个光网络终端测试模块；3)通过第i个光网络终端测试模块关断第i个光网络终端的上行工作光波；4)检测光线路终端能否用上行工作光波与第i个光网络终端以外的所有光网络终端通信；以及5)如果光线路终端与第i个光网络终端以外的所有光网络终端是可通信的，则测出该处光网络终端故障，测试结束，如果不能并且轮询未结束，则打开下一个个光网络终端的上行工作光波，回到步骤2)继续检测直到轮询结束。本发明测试方法和装置的有益效果是，测试都由光线路终端测试模块发起，可以实现自动执行，自动触发，而且不受工作复用波长影响，实现迅速排障。

A method and device for testing a passive optical network fault, by 1) respectively starting an optical line terminal test module and an optical network terminal test module; Network terminal test module; 3) turn off the uplink working light wave of the i th optical network terminal through the i th optical network terminal test module; 4) detect whether the optical line terminal can use the uplink working light wave to connect All optical network terminals communicate; and 5) if the optical line terminal is communicable with all optical network terminals other than the i-th optical network terminal, then detect the fault of the optical network terminal at this place, and the test ends, if not and the polling fails When it is finished, turn on the uplink working light waves of the next optical network terminals, and return to step 2) to continue detection until the polling ends. The beneficial effect of the testing method and device of the present invention is that the testing is initiated by the optical line terminal testing module, which can realize automatic execution and automatic triggering, and is not affected by the working multiplexed wavelength, so that rapid troubleshooting can be realized.

Description

Translated fromChinese

无源光网络故障的测试方法Test methods for faults in passive optical networks

技术领域technical field

本发明涉及无源光网络技术，更具体地说，涉及一种发生故障时对无源光网络故障的测试方法和装置。The present invention relates to passive optical network technology, more specifically, to a method and device for testing passive optical network faults when faults occur.

背景技术Background technique

在规模越来越大的宽带接入网络中，现有的大部分局域网(LAN)都运行在100Mbit/s的网络上，而许多大规模的商业公司正在向吉比特以太网(GE)过渡。而在城域核心网和城域边缘网上，SONET/SDH/GE带宽容量非常充裕，这使得接入网部分产生了严重的带宽瓶颈。与电缆传输相比较，光纤传输具有容量大、损耗小、防电磁干扰能力强等优势，因而，随着光纤传输的成本逐步下降，接入网的光纤化是必然的发展趋势。代表着“最后一公里”部分的接入网段，有超低成本、简单结构以及便于实现等要求，这给技术实现带来了很大的挑战。光纤接入网可分为无源接入和有源接入两种，无源光网络(PON)是一种极具吸引力的接入方式，其主要特点是：低成本——显著减少光纤、光收发模块、中心局终端的数量，初期投资可被多个终端用户分摊；整个光传输通道为光纤和无源光器件，可有效避免电磁干扰和雷电影响，提高了系统的可靠性；光分配网络(ODN)模块可挂在路边，无需远程供电和机房，降低了运行维护成本；对业务透明，便于系统升级、管理和引入新业务；带宽大、传输距离长(可达到20km)。因此基于无源光网络(PON)技术的接入方案将成为宽带光接入的首选技术。无源光网络接入业务的传输有以ATM为传输平台的APON(ATM Based PONs)和以以太网技术为传输平台的EPON(EthernetBased PONs)以及以通用帧结构为传输平台的GPON(Gigabit PONs)三种类型。In the increasingly large-scale broadband access network, most of the existing local area networks (LAN) run on the 100Mbit/s network, and many large-scale commercial companies are transitioning to Gigabit Ethernet (GE). On the core network of the metropolitan area and the edge network of the metropolitan area, SONET/SDH/GE bandwidth capacity is very abundant, which causes serious bandwidth bottlenecks in the access network. Compared with cable transmission, optical fiber transmission has the advantages of large capacity, low loss, and strong anti-electromagnetic interference ability. Therefore, as the cost of optical fiber transmission gradually decreases, the fiber opticization of the access network is an inevitable development trend. The access network segment representing the "last mile" has requirements such as ultra-low cost, simple structure, and easy implementation, which brings great challenges to technical implementation. Optical fiber access network can be divided into two types: passive access and active access. Passive optical network (PON) is a very attractive access method. Its main features are: low cost - significantly reducing optical fiber , the number of optical transceiver modules, and central office terminals, the initial investment can be shared by multiple end users; the entire optical transmission channel is optical fiber and passive optical devices, which can effectively avoid electromagnetic interference and lightning effects, and improve system reliability; The distribution network (ODN) module can be hung on the side of the road without remote power supply and computer room, which reduces the operation and maintenance cost; it is transparent to the business, which is convenient for system upgrade, management and introduction of new services; it has large bandwidth and long transmission distance (up to 20km). Therefore, the access scheme based on passive optical network (PON) technology will become the preferred technology for broadband optical access. The transmission of passive optical network access services includes APON (ATM Based PONs) with ATM as the transmission platform, EPON (Ethernet Based PONs) with Ethernet technology as the transmission platform, and GPON (Gigabit PONs) with the general frame structure as the transmission platform. Three types.

如图1所示，一个典型的无源光网络系统由光线路终端(OLT)、光网络终端(ONT，或称ONU)、光分配网络(ODN)组成。OLT放在中心机房，ONT放在用户端。ODN包括各种无源光器件如光纤、分路器(splitter)，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。在一个PON网络中，可从服务交换局拉出单根光纤到宽带业务子区或办公园区，然后再用无源光分路器从主光纤分离出若干支路到各个大楼或业务设备上。该方式可使多个用户共享从交换局到用户驻地这段非常昂贵的光纤链路，因而也降低了光纤到楼(FTTB)和光纤到户(FTTH)的使用成本。As shown in FIG. 1 , a typical passive optical network system consists of an optical line terminal (OLT), an optical network terminal (ONT, or ONU), and an optical distribution network (ODN). The OLT is placed in the central equipment room, and the ONT is placed at the user end. ODN includes various passive optical components such as optical fibers and splitters. Optical splitters are passive optical fiber splitters, which are passive devices that connect optical line terminals and optical network units. Its function is to distribute downlink data And centralize upstream data. In a PON network, a single optical fiber can be pulled from the service switching office to the broadband service sub-area or office park, and then a passive optical splitter is used to separate several branches from the main optical fiber to various buildings or business equipment. This method allows multiple users to share the very expensive optical fiber link from the switching office to the user's premise, thus reducing the cost of using fiber to the building (FTTB) and fiber to the home (FTTH).

PON下行采用广播方式传输，上行采用时分多址(TDMA)方式传输，图2为PON上行TDMA原理图，各ONT上行数据分时上行，由OLT统一调度。The downlink of PON is transmitted by broadcasting, and the uplink is transmitted by time-division multiple access (TDMA). Figure 2 is a schematic diagram of PON uplink TDMA. The uplink data of each ONT is time-division uplinked, and is uniformly scheduled by the OLT.

在实际应用过程中，特别是当终端数量增多后，终端维护问题将越来越突出，对PON光路的测试是其中较重要的部分，现有对终端的测试和测试是基于单个波长下采用OAM(操作维护管理)的信息进行测试，当物理层正常时，可以利用该技术进行故障测试和维护。一旦物理层出现故障，比如ONT光模块故障，将导致强制长发光，100％占用PON上行光路通道，导致其他ONU/ONT的上行数据无法上行，包括维护关联信息都无法上传，导致所有ONT都故障，OLT到所有ONT之间的通路中断，而且还不方便定位出现故障的ONT终端的位置。图3为某个ONT出现故障时的上行传输图，当某个ONT恒定发光时，上行通道被100％占用，使别的ONT都不能与OLT通信。In the actual application process, especially when the number of terminals increases, the problem of terminal maintenance will become more and more prominent. The test of PON optical path is a more important part. The existing test and test of terminals are based on the use of OAM at a single wavelength. (Operation and maintenance management) information for testing, when the physical layer is normal, this technology can be used for fault testing and maintenance. Once the physical layer fails, such as the failure of the ONT optical module, it will lead to forced long-term lighting, 100% occupation of the PON upstream optical path channel, resulting in the failure of other ONU/ONT upstream data, including maintenance related information cannot be uploaded, resulting in failure of all ONTs , the path between the OLT and all ONTs is interrupted, and it is not convenient to locate the location of the faulty ONT terminal. Figure 3 is the uplink transmission diagram when a certain ONT fails. When a certain ONT lights up constantly, the uplink channel is 100% occupied, so that other ONTs cannot communicate with the OLT.

发明内容Contents of the invention

本发明要解决的技术问题在于，针对现有光网路终端测试的缺陷，提供一种利用测试光波提供光网路终端测试的方法和装置。The technical problem to be solved by the present invention is to provide a method and device for providing optical network terminal testing by using test light waves for the defects of existing optical network terminal testing.

本发明上述技术问题这样解决，构造一种无源光网络故障的测试方法，包括以下步骤：S1)分别启动光线路终端测试模块和光网络终端测试模块；The above-mentioned technical problem of the present invention is solved like this, constructs a kind of testing method of passive optical network fault, comprises the following steps: S1) start optical line terminal test module and optical network terminal test module respectively;

S2)由光线路终端测试模块通过步骤S3)-S5)轮询每一个光网络终端测试模块；S2) poll each optical network terminal test module by the optical line terminal test module through steps S3)-S5);

S3)对轮询到的光网络终端测试模块关断其上行工作光波；S3) Turn off the uplink working optical wave of the polled optical network terminal test module;

S4)检测光线路终端是否能与被轮询光网络终端以外的所有光网络终端用上行工作光波通信；S4) Detect whether the optical line terminal can communicate with all optical network terminals other than the polled optical network terminal using uplink working light waves;

S5)如果光线路终端能与当前被轮询光网络终端以外的所有光网络终端通信，测试出该处光网络终端故障，测试结束；否则继续轮询直到轮询结束。S5) If the optical line terminal can communicate with all optical network terminals other than the currently polled optical network terminal, the test finds that the optical network terminal is faulty, and the test ends; otherwise, continue polling until the polling ends.

按照本发明的一种无源光网络故障的测试装置，其特征在于，包括位于光线路终端侧的光线路终端测试模块和至少两个位于光网络终端侧的光网络终端测试模块；光线路终端测试模块和光网络终端测试模块能够收发测试光波光信号，并且通过测试光波光信号，光线路终端测试模块和光网络终端测试模块能够彼此通信。A passive optical network fault testing device according to the present invention is characterized in that it includes an optical line terminal test module located at the optical line terminal side and at least two optical network terminal test modules located at the optical network terminal side; the optical line terminal The test module and the optical network terminal test module can send and receive test lightwave optical signals, and by testing the lightwave light signals, the optical line terminal test module and the optical network terminal test module can communicate with each other.

在本发明上述装置中，光线路终端测试模块和光线路终端设备之间设置有通信通道，由光线路终端设备启动光线路终端测试模块和光网络终端测试模块；所述光线路终端测试模块被启动测试后轮询每一个光网络终端测试模块；所述光网络终端测试模块和光网络终端设备之间设置有通信通道，当光网络终端测试模块被轮询时，对应的光网络终端设备控制该光网络终端测试模块关断其上行工作光波，同时由光线路终端设备检测光线路终端设备能否用上行工作光波与被轮询光网络终端以外的所有光网络终端设备通信；如能通信，生产该处光网络终端设备存在故障的测试信号。In the above device of the present invention, a communication channel is provided between the optical line terminal test module and the optical line terminal equipment, and the optical line terminal equipment starts the optical line terminal test module and the optical network terminal test module; the optical line terminal test module is started to test After polling each optical network terminal test module; a communication channel is provided between the optical network terminal test module and the optical network terminal equipment, and when the optical network terminal test module is polled, the corresponding optical network terminal equipment controls the optical network The terminal test module turns off its uplink working light wave, and at the same time, the optical line terminal equipment detects whether the optical line terminal equipment can use the uplink working light wave to communicate with all optical network terminal equipment other than the polled optical network terminal; if it can communicate, produce the A test signal that there is a fault in the optical network terminal equipment.

在本发明上述装置中，光线路终端测试模块和光网络终端测试模块是能够独立测试的测试模块。In the above device of the present invention, the optical line terminal test module and the optical network terminal test module are test modules capable of independent testing.

在本发明上述装置中，光网络终端光模块是能够接收光网络终端测试模块指示，关断上行工作光波的光模块。In the above-mentioned device of the present invention, the optical network terminal optical module is an optical module capable of receiving an instruction from the optical network terminal test module and shutting off the uplink working optical wave.

在本发明上述装置中，光线路终端测试模块和至少两个位于光网络终端侧的光网络终端测试模块之间通过光纤及光分路器连接。In the above device of the present invention, the optical line terminal test module is connected to at least two optical network terminal test modules located on the optical network terminal side through optical fibers and optical splitters.

实施本发明提供的无源光网络故障的测试方法和装置的有益效果是，由于测试都由光线路终端测试模块发起，可以实现自动执行，自动触发，而且不受工作复用波长影响，实现迅速排障。The beneficial effect of implementing the passive optical network fault testing method and device provided by the present invention is that since the tests are all initiated by the optical line terminal test module, automatic execution and automatic triggering can be realized, and they are not affected by the working multiplexed wavelength, and can be realized quickly. Troubleshooting.

附图说明Description of drawings

下面将结合附图及实施例对本发明作进一步说明，附图中：The present invention will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

图1是现有技术的PON系统示意图；FIG. 1 is a schematic diagram of a PON system in the prior art;

图2是现有技术的PON上行TDMA传输原理图；FIG. 2 is a schematic diagram of PON uplink TDMA transmission in the prior art;

图3是现有技术的ONT故障时上行传输图；Fig. 3 is the upstream transmission diagram when the ONT of the prior art fails;

图4是本发明的第一实施例的整体结构示意图；Fig. 4 is a schematic diagram of the overall structure of the first embodiment of the present invention;

图5是本发明的第一实施例的ONT故障时整体结构示意图；Fig. 5 is a schematic diagram of the overall structure when the ONT of the first embodiment of the present invention fails;

图6是本发明的第一实施例的ONT解除故障时上行TDMA传输图；Fig. 6 is the uplink TDMA transmission diagram when the ONT of the first embodiment of the present invention removes the fault;

图7是本发明的第一实施例的测试系统的通信图。Fig. 7 is a communication diagram of the test system of the first embodiment of the present invention.

图8是本发明的第一实施例的测试系统的另一通信图。Fig. 8 is another communication diagram of the test system of the first embodiment of the present invention.

图9是本发明的第一实施例的测试系统的流程图。Fig. 9 is a flow chart of the test system of the first embodiment of the present invention.

具体实施方式Detailed ways

图4示出了本发明的一个优选实施例，首先建立一个树型网络，其包括光线路终端侧(OLT side)，ODN，以及N个光网络终端侧(ONT side)。OLT侧包括PON OLT光模块2和测试模块1(OLT tester)，每个ONT侧包括PON ONT光模块4和测试模块3(OLT tester)，光分配网络(ODN)包括光纤，1:N分路器5。其中，可以设定PON OLT光模块光发射波长为1490nm，光接收波长为1310nm，PON ONT光模块光发射波长为1310nm，光接收波长为1490nm。可以看出本实施例同样适用于别的波长。FIG. 4 shows a preferred embodiment of the present invention. First, a tree network is established, which includes an optical line terminal side (OLT side), an ODN, and N optical network terminal sides (ONT side). OLT side includes PON OLToptical module 2 and test module 1 (OLT tester), each ONT side includes PON ONT optical module 4 and test module 3 (OLT tester), optical distribution network (ODN) includes optical fiber, 1:N split device 5. Among them, the optical emission wavelength of the PON OLT optical module can be set to 1490nm, the optical reception wavelength is 1310nm, the optical emission wavelength of the PON ONT optical module is 1310nm, and the optical reception wavelength is 1490nm. It can be seen that this embodiment is equally applicable to other wavelengths.

在OLT侧和ONT侧之间建立PON连接，在OLT侧处由OLT测试模块1发射测试光波，这里设定测试光波是Bnm，通过一个合波器将该波长和由OLT发射的下行工作波长1490nm波长合波，由ODN通过时分复用传送到各个ONT侧，在ONT侧经过分波处理将测试光波Bnm分离出来，并输入位于ONT侧的ONT测试模块，该ONT测试模块能够收发Bnm波长的光信号，下行工作波长1490nm波长将进入ONT处理，这样就实现了下行数据的传输。A PON connection is established between the OLT side and the ONT side, and the test light wave is emitted by theOLT test module 1 at the OLT side. Here, the test light wave is set to be Bnm, and the wavelength is combined with the downlink working wavelength 1490nm emitted by the OLT through a multiplexer. Wavelength multiplexing is transmitted by ODN to each ONT side through time division multiplexing. On the ONT side, the test light wave Bnm is separated through demultiplexing processing and input to the ONT test module on the ONT side. The ONT test module can send and receive light of Bnm wavelength. The signal and the downlink working wavelength of 1490nm will enter the ONT for processing, thus realizing the transmission of downlink data.

然后在ONT侧处将由ONT发射的上行工作光波1310nm和测试光波Bnm进行合波，并上传至OLT处，在OLT侧处分离出测试光波，送给OLT测试模块，将上行工作光波1310nm送入OLT业务模块处理。完成上行数据的传输。测试光波Bnm为固定值，与工作波长一样，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。Then, on the ONT side, the uplink working light wave 1310nm and test light wave Bnm emitted by the ONT are combined, and uploaded to the OLT, and the test light wave is separated on the OLT side, and sent to the OLT test module, and the uplink working light wave 1310nm is sent to the OLT Business module processing. Complete the transmission of uplink data. The test light wave Bnm is a fixed value, which is the same as the working wavelength. The time division multiplexing technology is used in the downlink direction, and the time division multiplexing related access protocol is implemented in the uplink direction.

图5示出了本发明的第一实施例的ONT故障时整体结构示意图，为了方便，省略了下行传输方向。当ONT出现恒定发光时，OLT发出关断上行业务的指令，OLT测试模块接收此指令，通过测试光波传给ONT测试模块，然后让ONT接收此指令，关断该ONT的上行工作光波。而其余的ONT的上行工作光波都打开，检测此时别的ONT能否与OLT通信，如果别的ONT仍然不能与OLT通信，说明该处ONT没有故障。FIG. 5 shows a schematic diagram of the overall structure of the ONT in the first embodiment of the present invention when it fails. For convenience, the downlink transmission direction is omitted. When the ONT emits constant light, the OLT sends an instruction to shut down the upstream service. The OLT test module receives this instruction and transmits it to the ONT test module through the test light wave, and then allows the ONT to receive this instruction and turn off the ONT’s upstream working light wave. And the other ONT's uplink light waves are turned on to check whether other ONTs can communicate with OLT at this time. If other ONTs still cannot communicate with OLT, it means that the ONT at this place is not faulty.

打开该ONT的上行发光，让OLT轮询别的ONT，逐个关断ONT的上行工作光波，当发现OLT能够和除关断上行工作光波外的所有的ONT正常通信，说明此处的ONT故障，通过此时测试光波的信息，可以在OLT测试模块处测试出出现故障的ONT的位置，并且排除了上行传输的故障。Turn on the upstream light of this ONT, let the OLT poll other ONTs, and turn off the upstream light waves of the ONTs one by one. When it is found that the OLT can communicate with all ONTs except for the upstream light waves, it means that the ONT here is faulty. Through the information of the light wave tested at this time, the location of the faulty ONT can be tested at the OLT test module, and the fault of the uplink transmission can be eliminated.

图6为本发明的第一实施例的ONT解除故障时上行TDMA传输图，除了出现故障的ONT外，别的ONT都能和OLT通信。FIG. 6 is an uplink TDMA transmission diagram when an ONT is released from a fault according to the first embodiment of the present invention. Except for the faulty ONT, other ONTs can communicate with the OLT.

图7为本发明的第一实施例的测试系统的通信图。Fig. 7 is a communication diagram of the test system of the first embodiment of the present invention.

OLT测试模块和ONT测试模块都能收发Bnm波长的光信号，作为独立测试装置通过该光波收发消息彼此通信。Both the OLT test module and the ONT test module can send and receive optical signals of Bnm wavelength, and serve as independent test devices to communicate with each other through the light wave sending and receiving messages.

图8为本发明的第一实施例的测试系统的另一通信图。FIG. 8 is another communication diagram of the testing system of the first embodiment of the present invention.

OLT测试模块也可由OLT设备统一调度控制后再与ONT测试模块通信，ONT测试模块也可由ONT终端统一调度控制后再与OLT测试模块通信。The OLT test module can also be uniformly dispatched and controlled by the OLT equipment before communicating with the ONT test module, and the ONT test module can also be uniformly dispatched and controlled by the ONT terminal before communicating with the OLT test module.

而且ONT终端设备能接收测试模块指示，关断上行工作光波，排除故障。Moreover, the ONT terminal equipment can receive the instruction of the test module, turn off the uplink working optical wave, and troubleshoot.

图9为本发明的第一实施例的测试系统的流程图：Fig. 9 is the flowchart of the test system of the first embodiment of the present invention:

流程图解析如下：The flow chart is parsed as follows:

第1步，分别启动OLT侧处的OLT测试模块和ONT侧的ONT测试模块，由OLT测试模块发射出测试光波；Step 1, start the OLT test module at the OLT side and the ONT test module at the ONT side respectively, and emit test light waves from the OLT test module;

第2步，由ONT侧处的ONT测试模块通过测试光波与OLT测试模块通信，轮询的在N个ONT侧中选择第i个ONT侧；Instep 2, the ONT test module at the ONT side communicates with the OLT test module through the test light wave, and selects the i-th ONT side among the N ONT sides for polling;

第3步，位于第i个ONT侧的第i个ONT测试模块接收OLT测试模块指令，并把该指令传给第i个ONT，第i个ONT接收此指令，关断第i个ONT的上行工作光波；Step 3: The i-th ONT test module on the side of the i-th ONT receives the command from the OLT test module, and transmits the command to the i-th ONT, and the i-th ONT receives the command and turns off the upstream of the i-th ONT working light wave;

第4步，检测OLT是否能与第i个光网络终端以外的所有ONT通信；Step 4, detect whether the OLT can communicate with all ONTs other than the i-th optical network terminal;

第5步，如果OLT能与第i个光网络终端以外的所有ONT通信，说明该处ONT故障，测试出该处光网络终端故障，同时因为关断了故障的ONT，排除了整个PON的上行传输的故障，测试结束，如果不能并且i＜＝N，打开第i个光网络终端的上行工作光波，回到第2步且i＝i+1。Step 5, if the OLT can communicate with all ONTs other than the i-th optical network terminal, it means that the ONT at this location is faulty, and the optical network terminal at this location is faulty. At the same time, because the faulty ONT is turned off, the uplink of the entire PON is excluded. If there is a fault in the transmission, the test ends. If not and i<=N, turn on the uplink working optical wave of the i-th optical network terminal, and return tostep 2 and i=i+1.

由流程图可看出，测试都由光线路终端测试模块发起，可以实现自动执行，自动触发，而且不受工作复用波长影响，实现迅速排障。It can be seen from the flow chart that the tests are all initiated by the optical line terminal test module, which can realize automatic execution and automatic triggering, and is not affected by the multiplexing wavelength of the work, so as to realize rapid troubleshooting.

现有PON技术下行通道的波长为1490nm，上行波长为1310nm，如果承载CATV，下行还将有另外一个波长1550nm；可以理解此时只需要再增加一个对称的上下行波长Cnm，区别于上述波长Bnm，该波长Cnm仍将主要用来测试。The wavelength of the downlink channel of the existing PON technology is 1490nm, and the uplink wavelength is 1310nm. If CATV is carried, the downlink will have another wavelength of 1550nm; it can be understood that only a symmetrical uplink and downlink wavelength Cnm needs to be added at this time, which is different from the above-mentioned wavelength Bnm , the wavelength Cnm will still be mainly used for testing.

同样，可以理解此实施例不仅仅局限于可增加的波长的数目，也不受工作复用波长的影响，所以本发明不应限于所公开的具体实施例，而是本发明将包括权利要求内的所有实施例。Equally, it can be understood that this embodiment is not limited to the number of wavelengths that can be increased, nor is it affected by the working multiplexing wavelength, so the present invention should not be limited to the disclosed specific embodiments, but the present invention will include all examples.

Claims (1)

Translated fromChinese

1、一种无源光网络故障的测试方法，其特征在于，包括以下步骤：1, a kind of testing method of passive optical network fault, it is characterized in that, comprises the following steps:S1)分别启动光线路终端测试模块和光网络终端测试模块；S1) Start the optical line terminal test module and the optical network terminal test module respectively;S2)由光线路终端测试模块通过步骤S3)-S5)轮询每一个光网络终端测试模块；S2) poll each optical network terminal test module by the optical line terminal test module through steps S3)-S5);S3)对轮询到的光网络终端测试模块关断其上行工作光波；S3) Turn off the uplink working optical wave of the polled optical network terminal test module;S4)检测光线路终端是否能与被轮询光网络终端以外的所有光网络终端用上行工作光波通信；S4) Detect whether the optical line terminal can communicate with all optical network terminals other than the polled optical network terminal using uplink working light waves;S5)如果光线路终端能与当前被轮询光网络终端以外的所有光网络终端通信，测试出该处光网络终端故障，测试结束；否则继续轮询直到轮询结束。S5) If the optical line terminal can communicate with all optical network terminals other than the currently polled optical network terminal, the test finds that the optical network terminal is faulty, and the test ends; otherwise, continue polling until the polling ends.

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