Chain epo n system and topology connection automatic generation method based on the system

Abstract

The application relates to the technical field of communication networks, in particular to a chain EPON system and a topology connection automatic generation method based on the system, which comprises an optical line terminal (OLT) arranged at a local end; a splitting node corresponding to each user end and used for performing optical splitting treatment on downlink optical signals or uplink optical signals; an optical network unit (ONU) arranged at each user end, wherein the ONUs are connected with the OLT through optical fiber links via the respective corresponding splitting nodes, and a chain topology architecture is formed; and a detection module arranged at the user end, which is connected with the corresponding local ONU and the corresponding splitting node, is used for detecting uplink optical signals uploaded by the ONU linked on the subsequent optical fiber link of the corresponding splitting node, and generates data information used for generating an ONU connection topology architecture by an operation and maintenance server end. The application can dynamically generate a connection topology architecture of the chain EPON system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication network, in particular to a chain EPON system and a topology connection automatic generation method based on the system. BACKGROUND

[0002] Passive optical network (PON) is a point-to-multipoint passive optical fiber access technology, which is composed of an optical line terminal (OLT) at the station end, an optical network unit (ONU) at the user end, and an optical distribution network (ODN). The so-called "passive" means that there is no active electronic device and electronic power supply in the ODN, and all are composed of passive devices such as optical splitters. After the OLT is started, the ONU is allowed to access, and a logical link identifier (LLID) unique to the OLT port is allocated to the ONU requesting registration.

[0003] Ethernet passive optical network (EPON) is a PON technology based on Ethernet, which combines Ethernet and PON technology, uses PON technology in the physical layer, and uses the topology structure of PON to realize Ethernet access.

[0004] In related technologies, the device connection topology architecture of the EPON system is generally tree type or star type architecture, but in some industrial application occasions, a chain connection topology architecture in the form of hand in hand needs to be adopted.

[0005] In the practice process, the inventors found that at least the following problems exist in the technology:

[0006] In actual industrial application occasions, because of some randomness in the installation process, the connection order of the ONU devices in this chain topology architecture cannot be accurately grasped, and then it is difficult to quickly locate the fault device and eliminate the fault during subsequent system operation and maintenance. SUMMARY

[0007] In order to solve the above problems, the present application provides a chain EPON system and a topology connection automatic generation method based on the system, which can detect the connection order of the ONU of the chain EPON system and dynamically generate the connection topology architecture.

[0008] In a first aspect, the present application provides a chain EPON system, which adopts the following technical solution:

[0009] A chain EPON system, comprising:

[0010] an optical line terminal (OLT) disposed at a local end;

[0011] a splitting node corresponding to each user end, for splitting downlink optical signals or uplink optical signals;

[0012] an optical network unit (ONU) disposed at each user end, the ONUs being connected to the OLT via respective optical fiber links and respective splitting nodes, to form a chain topology architecture;

[0013] a detection module disposed at a user end, the detection module being connected to a corresponding local ONU and a corresponding splitting node, for detecting uplink optical signals uploaded by the ONU connected to the subsequent optical fiber link of the corresponding splitting node to the OLT, and generating data information for an operation and maintenance server to generate an ONU connection topology architecture.

[0014] Through the above technical solution, the detection module is provided to dynamically detect the subsequent ONU equipment in the chain EPON system, and the connection topology architecture can be dynamically generated according to the detected ONU list information.

[0015] In some embodiments, each of the splitting nodes comprises a first splitting unit and a second splitting unit in sequence in the downlink direction of the optical signals.

[0016] Through the above technical solution, the splitting node is divided into the first splitting unit and the second splitting unit for splitting the downlink optical signals and the uplink optical signals, respectively.

[0017] In some embodiments, the first splitting unit splits the downlink optical signals sent by the OLT, and does not split the uplink optical signals; and the second splitting unit splits the uplink optical signals uploaded by the ONU connected to the subsequent optical fiber link of the splitting node, and does not split the downlink optical signals.

[0018] Through the above technical solution, the first splitting unit and the second splitting unit have different functions, and the processing logic thereof for the downlink optical signals and the uplink optical signals is different.

[0019] In some embodiments, the first splitting unit has one uplink optical interface connected to the OLT via an optical fiber link, and two downlink optical interfaces connected to the corresponding ONU and the uplink optical interface of the second splitting unit, respectively.

[0020] The second splitting unit has two uplink optical interfaces connected to the downlink optical interface of the first splitting unit and the corresponding detection module, respectively, and one downlink optical interface connected to other splitting nodes after the corresponding splitting node.

[0021] The technical solution can determine the connection structure of the first light splitting unit and the second light splitting unit.

[0022] In some embodiments, the detection module is bound to the corresponding local ONU, and can also be used to detect the running status of the local ONU.

[0023] According to the technical solution, the detection module is connected to and bound to the local ONU, and can be used to detect the online registration and running status of the local ONU.

[0024] In the second aspect, the application provides a method for automatically generating a topology connection of a chain EPON system, and the following technical solution is adopted:

[0025] A method for automatically generating a topology connection of a chain EPON system based on the technical solution, and the method comprises the following steps:

[0026] Obtaining first data information corresponding to each optical port of the OLT, wherein the first data information comprises MAC address-LLID allocation information of each ONU connected to each optical port of the OLT respectively;

[0027] Obtaining second data information uploaded by each detection module, wherein the second data information comprises IP-MAC address binding information between the detection module and the corresponding ONU;

[0028] Distributing the MAC address-LLID allocation information to each detection module, so as to verify and analyze the obtained uplink detection signal by each detection module and generate the subsequent LLID list;

[0029] Obtaining third data information uploaded by each detection module, wherein the third data information comprises the subsequent LLID list; the subsequent LLID list is generated by analyzing the obtained uplink detection signal by each detection module; the uplink detection signal is obtained by the light splitting node corresponding to the detection module, and is sent to the detection module after being processed by the light splitting node;

[0030] Generating an ONU cascade list linked by each optical port of the OLT according to all the subsequent LLID lists, the MAC address-LLID allocation information and the IP-MAC address binding information;

[0031] Generating an ONU connection topology architecture of the chain EPON system dynamically according to the ONU cascade list.

[0032] The above technical solution is applied to the operation and maintenance server. After each detection module receives the uplink optical signal uploaded by the ONU device connected to the downstream of the fiber optic link, it verifies and parses the LLID in the uploaded message to generate a downstream LLID list. The detection module sends the list to the operation and maintenance server, which then generates an ONU cascade list and finally dynamically generates the ONU connection topology.

[0033] In some implementations, it also includes:

[0034] The ONU connection topology of the chained EPON system is periodically and dynamically generated.

[0035] Each generated ONU connection topology is compared with the previous generated ONU connection topology to locate the faulty node in the corresponding ONU device, splitter node, or fiber optic link when an abnormal ONU connection occurs.

[0036] Through the above technical solution, the ONU connection topology of the system is generated periodically and dynamically. When a fault occurs, the faulty node can be quickly located through the ONU connection topology, so as to quickly eliminate the fault.

[0037] In some implementations, the downstream LLID list includes all LLIDs corresponding to downstream ONUs that the detection module can detect, and the downstream ONUs are the ONU devices linked on the subsequent optical fiber links of the optical splitter corresponding to each detection module.

[0038] The above technical solution analyzes the uplink optical signal received by the detection module to obtain the LLID of the linked downstream ONU device. The LLIDs of all detected downstream ONU devices are used to form a downstream LLID list.

[0039] In some implementations, the MAC address-LLID allocation information includes: the association information between the LLID assigned by the OLT to each optical port connected ONU device and the MAC address of the ONU device;

[0040] The IP-MAC address binding information includes the association information between the IP address of the detection module and the MAC address of the ONU device.

[0041] The above technical solution assigns an LLID to each registered ONU and binds it to the MAC address of that ONU, recording their association; and associates and binds the IP address of each detection module with the MAC address of the local ONU device.

[0042] Thirdly, this application provides an automatic topology connection generation method for a chained EPON system, which adopts the following technical solution:

[0043] A method for automatically generating a topology connection of a chain EPON system based on the above technical solution, the method comprising:

[0044] The detection module sends IP-MAC address binding information between the detection module and the corresponding ONU to the operation and maintenance server;

[0045] The detection module obtains MAC address-LLID allocation information sent by the operation and maintenance server, wherein the MAC address-LLID allocation information is obtained by the operation and maintenance server from the OLT end;

[0046] The detection module obtains an uplink detection signal, wherein the uplink detection signal is sent to the detection module after being obtained by the optical splitting node corresponding to the detection module and being subjected to optical splitting processing;

[0047] The detection module verifies the uplink detection signal based on the MAC address-LLID allocation information and generates a subsequent LLID list by parsing;

[0048] The detection module sends the subsequent LLID list to the operation and maintenance server, so that the operation and maintenance server generates an ONU cascade list linked by each optical port of the OLT according to all the subsequent LLID lists, MAC address-LLID allocation information and IP-MAC address binding information, and dynamically generates an ONU connection topology architecture of the chain EPON system according to the ONU cascade list.

[0049] Through the above technical solution, applied to one end of the detection module, after each detection module receives an uplink optical signal uploaded by an ONU device connected by a subsequent stage of a fiber link, the LLID in the uploaded message is verified and parsed to generate a subsequent LLID list, which is sent to the operation and maintenance server by the detection module, and an ONU cascade list is generated by the operation and maintenance server, and finally an ONU connection topology architecture is dynamically generated.

[0050] In summary, the present application has at least one of the following beneficial technical effects:

[0051] 1. By respectively setting corresponding detection modules for each ONU device in the chain EPON system and providing an optical splitting node for the detection modules to provide an uplink detection signal, the connection order of each ONU device can be dynamically detected.

[0052] 2. According to the subsequent LLID list of the ONU device generated by parsing the uploaded message by each detection module, the ONU connection topology architecture of the chain EPON system is dynamically generated.

[0053] 3. The ONU connection topology architecture is periodically generated, and when a running fault occurs, the fault node can be quickly located to determine the possible faulty device, so as to quickly eliminate the fault. Attached Figure Description

[0054] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0055] Fig. 1 A schematic diagram of the topology of a chain-type EPON system provided in one embodiment of this application;

[0056] Fig. 2 A schematic diagram of the topology of an existing chain-based EPON system;

[0057] Fig. 3 A timing diagram of an automatic topology connection generation method provided in one embodiment of this application;

[0058] Among them, 1. OLT; 2. ONU; 3. Splitting node; 31. First splitting unit; 32. Second splitting unit; 4. Detection module. Detailed Implementation

[0059] To make the inventive objectives, features, and advantages of this application more apparent and understandable, the technical solution of one embodiment of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0060] The following is in conjunction with the appendix Figs. 1 to 3 This application will be described in further detail.

[0061] The Optical Line Terminal (OLT) is the core and leading part of the entire network / node, and completes functions such as ONU registration and management, network-wide synchronization and management, protocol conversion, and communication with the uplink network. The ONU, as the user terminal device, is a subordinate part of the entire network, and completes normal communication with the OLT and provides different application ports for end users.

[0062] like Fig. 1 The topology of a chain-type EPON system provided in one embodiment of this application, as shown, includes:

[0063] Optical Line Terminal (OLT1) is located at the central office.

[0064] The light splitting node 3 corresponds to each user end respectively, and is used for splitting the downlink optical signal or the uplink optical signal;

[0065] The optical network unit ONU 2 is arranged at each user end respectively, and is connected with the OLT 1 through the optical fiber link via the corresponding light splitting node 3, thereby forming a chain topology architecture.

[0066] The detection module 4 is arranged at the user end, and is connected with the corresponding local ONU 2 and the corresponding light splitting node 3, and is used for detecting the uplink optical signal uploaded by the ONU 2 connected to the subsequent optical fiber link of the corresponding light splitting node 3 to the OLT 1, and generating the data information used for generating the ONU connection topology architecture of the server end.

[0067] The operation and maintenance server is further included, and is used for dynamically generating the ONU connection topology architecture of the chain EPON system according to the data information uploaded by the detection module 4 and the data information read by the OLT end.

[0068] In the embodiment of the application, a new light splitting node + detection module is designed for the chain EPON system, and the ONU connection sequence in the chain EPON system can be dynamically detected, and the connection topology architecture is automatically generated by the server end.

[0069] In one embodiment of the application, the light splitting node 3 includes the first light splitting unit 31 and the second light splitting unit 32 in sequence in the downlink direction of the optical signal.

[0070] In one embodiment of the application, the first light splitting unit 31 performs the light splitting processing on the downlink optical signal sent by the OLT 1, and does not perform the light splitting processing on the uplink optical signal; and the second light splitting unit 32 performs the light splitting processing on the uplink optical signal uploaded by the ONU 2 connected to the subsequent optical fiber link of the light splitting node 3, and does not perform the light splitting processing on the downlink optical signal.

[0071] The light splitting node 3 is a passive light splitting device integrating two light splitting units, or is composed of two light splitting devices. The two light splitting units perform the light splitting processing on the downlink optical signal and the uplink optical signal respectively.

[0072] In one embodiment of the application, the uplink optical interface of the first light splitting unit 31 is one, and is connected with the OLT 1 through the optical fiber link; the downlink optical interface is two, and is connected with the corresponding ONU 2 and the uplink optical interface of the second light splitting unit 32 respectively; the uplink optical interface of the second light splitting unit 32 is two, and is connected with the downlink optical interface of the first light splitting unit 31 and the detection module 4 respectively; and the downlink optical interface is one, and is connected with other light splitting nodes after the corresponding light splitting node.

[0073] The first light splitting unit 31 is used for transmitting the downlink optical signal to the ONU2 device connected with the first light splitting unit 31 after light splitting processing; and the second light splitting unit 32 is used for transmitting the uplink optical signal to the detection module 4 connected with the second light splitting unit 32 after light splitting processing.

[0074] In an embodiment of the present application, the detection module 4 is bound with the corresponding local ONU2, and can also be used for detecting the running status of the local ONU2.

[0075] The detection module 4 is connected with the corresponding local ONU2 device through an electrical port, and can be used for detecting the registration status and the running status of the local ONU2 device and other related device information.

[0076] The device connection topology architecture of a general passive optical network EPON system is a star architecture, that is, an OLT device is connected with a passive light splitting device, and the passive light splitting device is connected with multiple ONU devices.

[0077] There is a core optical fiber connection between the OLT device and each user end site. The OLT is placed in a main station center machine room, and the passive light splitting device can be placed in the center machine room or a control station or a business hall which is relatively close to each site. The passive light splitting device and the OLT are connected through a core optical fiber, thereby saving the number of optical cables. The user end ONU is placed in the site, and the substation device realizes interconnection and intercommunication with the main station device through the ONU. Since the ONU has multiple network interfaces, the priority and bandwidth of each interface can be flexibly set, and different virtual networks can be correspondingly divided. Therefore, the EPON system can not only provide flexible network access for various businesses, but also provide a good network environment for the business access of the site.

[0078] However, in some industrial application occasions, a hand-in-hand chain connection topology architecture needs to be adopted, that is, the topology architecture of an existing chain EPON system as shown in Fig. 2 .

[0079] In a chain-like structure, the OLT device and each user terminal site are connected by a single optical fiber. When the optical fiber reaches the first site from the OLT along the cable path, it is split by a passive optical splitter. After splitting, one path connects to the ONU device at the user terminal, and the other path connects to the next user terminal site, and so on. This access method can significantly save backbone fiber resources and improve the utilization rate of fiber resources. Although each user terminal site is split at multiple levels, the network management structure remains two-tiered, meaning that the connection from the OLT to each ONU is direct, without any intermediate devices, thus ensuring flat management. However, due to some randomness during installation, the connection order of the ONU devices in this chain-like topology cannot be precisely controlled, making it difficult to quickly troubleshoot system failures. Therefore, the technical solution in this application is needed to solve this problem.

[0080] In this embodiment, the basic operating principle of the chained EPON system is as follows: the Optical Line Terminal (OLT) broadcasts downlink optical signals to each Optical Network Unit (ONU); each splitter node performs splitting processing on the downlink optical signals to obtain downlink split signals; the ONUs corresponding to each splitter node acquire the downlink split signals; the ONUs send uplink optical signals to the OLT, and when sending data to the OLT, they can only send data within the time slots pre-authorized by the OLT. This ensures that each ONU sends data in the required order, avoiding uplink data conflicts.

[0081] like Fig. 3 The automatic topology generation method for the chained EPON system shown can be implemented by following these steps:

[0082] 101. The maintenance server reads the MAC address-LLID allocation information of the ONU devices connected to each optical port of the OLT from the optical line terminal (OLT).

[0083] After the ONU goes online, the OLT will assign an LLID to the ONU. The operation and maintenance server can read the ONU device information connected to each optical port of the OLT, as well as the MAC address-LLID allocation information of the ONU device from the OLT.

[0084] 102. Each detection module sends the IP-MAC address binding information between the detection module and the corresponding ONU to the operation and maintenance server.

[0085] The detection module sends its own IP address and the relevant information of the bound ONU to the operation and maintenance server. The data sent by the detection module is transmitted to the operation and maintenance server via a fiber optic link.

[0086] 103. The operation and maintenance server distributes MAC address-LLID allocation information to each detection module.

[0087] The MAC address-LLID allocation information is used for the detection module to verify the LLID information of the subsequent ONU device.

[0088] 104. Each splitting node splits the uplink optical signal sent by the ONU and sends the obtained uplink detection signal to the corresponding detection module.

[0089] The second splitting unit of each splitting node splits the uplink optical signal, obtains the uplink detection signal, and sends the uplink detection signal to the detection module connected to the second splitting unit.

[0090] 105. The detection module verifies the uplink detection signal according to the MAC address-LLID allocation information distributed by the operation and maintenance server, and analyzes to generate a subsequent LLID list.

[0091] After the detection module obtains the uplink detection signal, it performs data verification on the uplink detection signal, analyzes the LLID in the uplink detection signal, and collects the LLIDs of all detected subsequent ONU devices to generate a subsequent LLID list.

[0092] The subsequent LLID list includes the LLIDs of all subsequent ONUs that can be detected by the detection module, and the subsequent ONU is the ONU device linked on the subsequent fiber link of the splitting node corresponding to each detection module.

[0093] In another embodiment of the application, the subsequent LLID list can include the LLID corresponding to the local ONU in addition to the LLID corresponding to the subsequent ONU. After reading the MAC address of the local ONU, the detection module can obtain the LLID corresponding to the local ONU through comparison of the MAC address-LLID allocation information distributed by the operation and maintenance server.

[0094] 106. Each detection module sends the generated subsequent LLID list to the operation and maintenance server.

[0095] After the detection module generates the subsequent LLID list, it is sent to the operation and maintenance server. The data sent by the detection module is sent to the operation and maintenance server through the fiber link.

[0096] 107. The operation and maintenance server generates an ONU cascade list linked by each optical port of the OLT according to all the subsequent LLID lists, the MAC address-LLID allocation information, and the IP-MAC address binding information.

[0097] After the operation and maintenance server collects all the subsequent LLID lists, it generates an ONU cascade list linked by each optical port of the OLT device under the management of the operation and maintenance server in combination with the MAC address-LLID allocation information and the IP-MAC address binding information.

[0098] In one embodiment of the present application, the following steps can also be implemented:

[0099] According to the MAC address-LLID allocation information and the IP-MAC address binding information, an IP-LLID-MAC address mapping table between the detection module and the corresponding ONU is generated;

[0100] The operation and maintenance server generates an ONU cascade list linked by each optical port of the OLT according to all the post-stage LLID lists and the IP-LLID-MAC address mapping table.

[0101] 108. The operation and maintenance server dynamically generates an ONU connection topology architecture of the chain EPON system according to the ONU cascade list.

[0102] The operation and maintenance server can dynamically generate an ONU connection topology architecture of the chain EPON system by aggregating the cascade lists of the ONUs.

[0103] Through the splitting node in the embodiment of the present application, the detection module connected thereto can receive the optical signal uploaded by the ONU device linked in the post-stage of the optical path to the OLT, verify and analyze the LLID in the uploaded message, generate a post-stage LLID list and upload it to the operation and maintenance platform; the operation and maintenance platform can generate a cascade list of the ONU connected to the optical port of the OLT according to the received post-stage LLID list detected by all the detection modules bound to the local ONU in the network, in combination with the MAC address, LLID information of the ONU device and the IP information of the detection module, and further dynamically generate an ONU connection topology architecture of the chain EPON system.

[0104] In one embodiment of the present application, when the system appears to have a running fault, the following steps can be implemented:

[0105] 201. The ONU connection topology architecture of the chain EPON system is periodically and dynamically generated;

[0106] The periodicity in the embodiment of the present application generally refers to that the ONU connection topology architecture is dynamically generated once every 1-10 minutes. In some cases (such as during debugging), it can also be once every half a minute.

[0107] 202. The ONU connection topology architecture generated each time is compared with the ONU connection topology architecture generated last time, so as to locate the fault node to the corresponding ONU device, splitting node or optical fiber link when the ONU connection appears to have an abnormal condition.

[0108] In one embodiment of the present application, after the ONU link topology architecture is generated, the running status of each user-side ONU device and fiber link can be dynamically detected based on the topology architecture. When a running failure occurs, whether the failure is caused by the ONU device or the failure is caused by the optical splitting node or the fiber link, the ONU device of the failure node cannot successfully transmit the uplink optical signal, and therefore the LLID information of the node where the ONU device is located cannot be acquired by the detection module set in the front-stage optical link device, i.e., the LLID of the ONU device of the failure node is missing in the rear-stage LLID list uploaded by each ONU device, which causes the generated connection topology architecture to be different from the previously generated connection topology architecture. If it is not a normal running status (i.e., it is not a normal or known ONU online or offline situation by the operation and maintenance personnel), the node whose device or optical link may have a problem can be located in this way, and therefore the failure node can be quickly located through this way.

[0109] If the detection module of a certain node fails to normally upload data information, because the running failure of the detection module does not affect the running of the ONU, whether the detection module has a running failure can be determined through the following way: if the ONU device information of the node can still be read by the operation and maintenance server at the OLT end within a certain period, the failure node is located at the detection module.

[0110] The detection module can detect the running status of the locally bound ONU device, and therefore it can be quickly determined whether the problem is caused by the device or the optical link. When the operation and maintenance personnel arrive for repair, it can be quickly determined whether the problem is caused by the ONU device, the optical link, or the various subordinate devices connected to the ONU.

[0111] In the embodiment of the present application, through the above technical solution, a chain EPON system and a topology connection automatic generation method based on the system are implemented, the connection topology architecture is dynamically generated, the connection sequence of the ONU device is accurately mastered, and then when a subsequent failure occurs, the failure device can be quickly located and the failure can be eliminated.

[0112] It should be noted that in this document, terms such as "comprise", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device. Without more limitations, the element defined by the statement "comprises a" does not exclude the presence of another identical element in the process, method, article or device that includes the element.

[0113] Although the embodiments of the present application have been shown and described, it is not to be taken as limiting the scope of the present application, and for those of ordinary skill in the art, it can be understood that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application. Therefore, any equivalent changes made in the structure, shape, principle of the present application shall be covered within the scope of the present application.

Claims

1. A method for automatically generating a topology connection of a chain EPON system, characterized in that the chain EPON system comprises: an optical line terminal (OLT) arranged at a central office; a splitting node corresponding to each user terminal, for splitting a downlink optical signal or an uplink optical signal; an optical network unit (ONU) arranged at each user terminal, the ONU being connected to the OLT via the corresponding splitting node through a fiber link, thereby forming a chain topology architecture; and a detection module arranged at the user terminal, the detection module being connected to the corresponding local ONU and the corresponding splitting node, for detecting an uplink optical signal uploaded by an ONU connected to the subsequent fiber link of the corresponding splitting node to the OLT, and generating data information for an operation and maintenance server to generate an ONU connection topology architecture. The method comprises: obtaining first data information corresponding to each optical port of the OLT, the first data information comprising MAC address-LLID allocation information of each ONU connected to each optical port of the OLT; obtaining second data information uploaded by each detection module, the second data information comprising IP-MAC address binding information between the detection module and the corresponding ONU; distributing the MAC address-LLID allocation information to each detection module, for each detection module to verify and analyze the obtained uplink detection signal to generate a subsequent LLID list; obtaining third data information uploaded by each detection module, the third data information comprising a subsequent LLID list; the subsequent LLID list is generated by each detection module analyzing the obtained uplink detection signal; the uplink detection signal is sent to the detection module after the uplink optical signal is obtained by the corresponding splitting node and is split by the splitting node; generating an ONU cascade list linked to each optical port of the OLT according to all the subsequent LLID lists, the MAC address-LLID allocation information, and the IP-MAC address binding information; and dynamically generating an ONU connection topology architecture of the chain EPON system according to the ONU cascade list. Further comprising: periodically dynamically generating the ONU connection topology architecture of the chain EPON system; and comparing each generated ONU connection topology architecture with the previously generated ONU connection topology architecture, for locating a fault node to the corresponding ONU device, splitting node, or fiber link when an abnormal condition of the ONU connection occurs. The subsequent LLID list comprises LLIDs of all subsequent ONU devices that can be detected by the detection module, the subsequent ONU devices being ONU devices connected to the subsequent fiber link of each detection module corresponding splitting node.

4. The method for automatically generating a topology connection of a chain EPON system according to claim 1 or 2, characterized in that the MAC address-LLID allocation information comprises association information between a LLID allocated by the OLT to an ONU device connected to each optical port and a MAC address of the ONU device; and the IP-MAC address binding information comprises association information between an IP address of the detection module and a MAC address of the ONU device. ​ ​ ​ ​ ​ ​ ​ ​ 2. The method of claim 1, wherein the method further comprises: receiving a request for a topology of the EPON system; and transmitting a response to the request for the topology of the EPON system. ​ ​ ​ 3. The method for automatically generating the topology of a chain-type EPON system according to claim 1 or 2, characterized in that: ​ ​ ​ ​ 5. The chain EPON system of claim 1, wherein: Each of the splitting nodes comprises a first splitting unit and a second splitting unit in turn in the optical signal downstream direction.

6. The chain EPON system of claim 5, wherein: The first splitting unit performs splitting processing on the downstream optical signal transmitted by the OLT and does not perform splitting processing on the upstream optical signal; the second splitting unit performs splitting processing on the upstream optical signal uploaded by the ONU linked on the subsequent fiber link of the splitting node and does not perform splitting processing on the downstream optical signal.

7. The chain EPON system according to claim 5 or 6, characterized in that: the first splitting unit has one upstream optical interface connected to the OLT through a fiber link and two downstream optical interfaces connected to the corresponding ONUs and the upstream optical interface of the second splitting unit respectively; the second splitting unit has two upstream optical interfaces connected to the downstream optical interfaces of the first splitting unit and the corresponding detection module respectively and one downstream optical interface connected to other splitting nodes after the corresponding splitting node; 8. The chain EPON system of claim 1, wherein: the detection module is bound to the corresponding local ONU and can also be used to detect the running status of the local ONU.

9. A method for automatically generating a topology connection based on a chain EPON system, characterized in that: the chain EPON system comprises: an optical line terminal (OLT) arranged at a station end; a splitting node corresponding to each user end for performing splitting processing on a downstream optical signal or an upstream optical signal; an optical network unit (ONU) arranged at each user end, the ONU being connected to the OLT through a fiber link via the corresponding splitting node to form a chain topology architecture; a detection module arranged at the user end, the detection module being connected to the corresponding local ONU and the corresponding splitting node for detecting an upstream optical signal uploaded by the ONU linked on the subsequent fiber link of the corresponding splitting node to the OLT and generating data information for an operation and maintenance server to generate an ONU connection topology architecture; the method comprises: the detection module sends IP-MAC address binding information between the detection module and the corresponding ONU to the operation and maintenance server; the detection module acquires MAC address-LLID allocation information sent by the operation and maintenance server, the MAC address-LLID allocation information being acquired by the operation and maintenance server from the OLT end; the detection module acquires an upstream detection signal, the upstream detection signal being acquired by the corresponding splitting node of the detection module from the upstream optical signal and sent to the detection module after splitting processing; the detection module verifies the upstream detection signal based on the MAC address-LLID allocation information and analyzes and generates a subsequent LLID list; the detection module sends the subsequent LLID list to the operation and maintenance server, which generates an ONU cascade list linked by each optical port of the OLT according to all the subsequent LLID lists, MAC address-LLID allocation information and IP-MAC address binding information and dynamically generates an ONU connection topology architecture of the chain EPON system according to the ONU cascade list.

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