Detection method and detection device for optical network terminal, and optical line terminal

Abstract

The invention discloses an optical network terminal detection method, a detection device and an optical line terminal, and belongs to the technical field of communication. The method is applied to a detection device, the detection device is connected with a first optical network terminal (ONT) through a first channel and connected with a second ONT through a second channel, the wavelength range received by the first channel is a first wavelength range, and the wavelength ranges received by the second channel are a second wavelength range and a third wavelength range. The first wavelength range is located between the second wavelength range and the third wavelength range, and the method comprises the following steps: under the condition that bandwidth authorization is not carried out on the first ONT, authorizing a first bandwidth greater than a first bandwidth threshold to a target ONT; and detecting a signal of the target ONT in the first channel to obtain a signal detection result, thereby determining whether the target ONT is an abnormal ONT. According to the invention, the detection of the abnormal ONT is realized through cross-channel signal detection, the detection accuracy is relatively high, and the efficiency is also relatively high.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a method, apparatus and method for detecting optical network terminals. Background Technology

[0002] With the continuous evolution of passive optical network (PON) technology, PON has split into two standard systems: gigabit passive optical network (GPON) and Ethernet passive optical network (EPON). As a common choice for the next generation of PON under both standard systems, 50G PON deployment needs to consider smooth evolution. Therefore, the standard defines uplink and downlink wavelengths for 50G PON that are different from those of GPON and 10G GPON. Furthermore, since 50G PON is also the next generation standard for EPON and 10G EPON, the issue of coexistence and evolution with EPON and 10G EPON must also be considered.

[0003] EPON and 10G EPON optical network terminations (ONTs) have multiple uplink wavelengths, which differ from those of 50GPON. Early EPON ONTs used Fabry-Perot (FP) lasers, whose wavelengths drift significantly with temperature changes. Under large temperature variations, this wavelength overlaps with the 50G PON uplink wavelength, impacting 50G signal quality. When deploying 50G PON in EPON areas, for ONTs using FP lasers that can still connect normally, it's necessary to detect these FP laser-using ONTs in the existing network and replace them to minimize the impact on 50G PON signal quality. Summary of the Invention

[0004] This application provides a method, device, and optical line terminal for detecting optical network terminals (ONTs) to accurately detect abnormal ONTs. The technical solution is as follows:

[0005] In a first aspect, a method for detecting an optical network terminal is provided. The method is applied to a detection device, which is connected to a first ONT via a first channel and to a second ONT via a second channel. The wavelength range received by the first channel is a first wavelength range, and the wavelength range received by the second channel is a second wavelength range and a third wavelength range. The first wavelength range is located between the second wavelength range and the third wavelength range. The method includes: granting a first bandwidth to a target ONT without granting bandwidth to the first ONT, wherein the first bandwidth is greater than a first bandwidth threshold, and the target ONT is any one of the second ONTs; detecting the signal of the target ONT via the first channel to obtain a signal detection result; and determining whether the target ONT is an abnormal ONT based on the signal detection result.

[0006] In this application, bandwidth is not allocated to the first ONT, but a first bandwidth exceeding a first bandwidth threshold is allocated to the target ONT. This ensures that the target ONT's signal is not affected by the first ONT's signal, leading to more accurate and efficient detection of the target ONT's signal. Furthermore, since the target ONT is connected to the second channel and no bandwidth is allocated to the first ONT connected to the first channel, its signal should not be detected on the first channel, which is not connected to the target ONT, provided its wavelength does not overlap with the first ONT's wavelength. In other words, the target ONT's signal should not be detected during cross-channel detection. Therefore, based on the detection of the target ONT's signal at the first channel, it is possible to accurately determine whether the target ONT is abnormal. In other words, this application achieves abnormal ONT detection through cross-channel signal detection, resulting in high accuracy and efficiency. An abnormal ONT can refer to an ONT whose wavelength overlaps with the first ONT's wavelength, or an ONT that affects the signal quality of the first ONT. Taking the first ONT as a 50G PON as an example, the abnormal ONT may correspond to an ONT that uses an FP laser.

[0007] In one possible implementation, detecting the signal of the target ONT in the first channel to obtain a signal detection result includes: detecting the received signal strength indication (RSSI) of the target ONT in the first channel to obtain the RSSI detection result of the target ONT; and determining whether the target ONT is an abnormal ONT based on the signal detection result, including: determining whether the target ONT is an abnormal ONT based on the RSSI detection result of the target ONT. By detecting the RSSI of the target ONT in the first channel, it is possible to determine whether the first channel has received the signal of the target ONT, thereby accurately determining whether the target ONT is abnormal.

[0008] In one possible implementation, detecting the RSSI of the target ONT in the first channel to obtain the RSSI detection result includes: detecting the RSSI of the target ONT multiple times in the first channel within a first reference time period to obtain the RSSI detection result; and determining whether the target ONT is an abnormal ONT based on the RSSI detection result, including: determining the target ONT as an abnormal ONT if the RSSI detection result indicates that the number of detected RSSIs reaches a threshold. Performing multiple detections in the first channel and determining the target ONT as abnormal only when the number of detected RSSIs reaches the threshold can reduce the randomness of the detection results, reduce false detections, and improve the accuracy of the detection results.

[0009] In one possible implementation, detecting the signal of the target ONT in the first channel to obtain a signal detection result includes: performing signal detection (SD) on the target ONT signal in the first channel to obtain the SD detection result of the target ONT signal; when the target ONT signal is detected, the SD detection result indicates a first level; when the target ONT signal is not detected, the SD detection result indicates a second level; determining whether the target ONT is an abnormal ONT based on the signal detection result includes: determining whether the target ONT is an abnormal ONT based on the SD detection result of the target ONT signal. By performing SD on the target ONT signal in the first channel, it is possible to accurately determine whether the first channel has received the target ONT signal, thereby accurately determining whether the target ONT is an abnormal ONT.

[0010] In one possible implementation, SD detection is performed on the target ONT signal in the first channel to obtain the SD detection result of the target ONT signal. This includes: performing multiple signal detection SD tests on the target ONT signal in the first channel within a second reference time period to obtain multiple SD detection results; and determining whether the target ONT is an abnormal ONT based on the SD detection results of the target ONT signal, including: determining the target ONT as an abnormal ONT if the number of SD detection results indicating a first level among the multiple SD detection results reaches a number threshold. Performing multiple tests in the first channel and determining the target ONT as abnormal when the number of SD detection results indicating a first level reaches a number threshold can reduce the randomness of the detection results, reduce false detections, and improve the accuracy of the detection results.

[0011] In one possible implementation, the method further includes: granting a second bandwidth to second ONTs other than the target ONT, where the second bandwidth is less than a second bandwidth threshold, and the second bandwidth threshold is less than a first bandwidth threshold. Granting a first bandwidth to the target ONT and a second bandwidth to the other second ONTs ensures that, after granting the first bandwidth to the target ONT, the bandwidth for transmitting signals from the other second ONTs is less than the bandwidth for transmitting signals from the target ONT. This reduces the probability of detecting the signals or signal power of the other second ONTs during detection, while increasing the probability of detecting the signals or signal power of the target ONT. In other words, it reduces interference from the signals of the other second ONTs to the detection of the target ONT's signal, ensuring detection accuracy. Furthermore, while the target ONT is being detected, the other second ONTs can still continue to provide services, reducing service loss during detection.

[0012] In one possible implementation, the method further includes: sequentially granting at least two third bandwidths to the target ONT, with the at least two third bandwidths increasing sequentially, and both of the at least two third bandwidths being greater than a second bandwidth threshold and less than a first bandwidth threshold, where the second bandwidth threshold is less than the first bandwidth threshold. By granting the target ONT incrementally, if the target ONT is an abnormal ONT, the probability and frequency of its signal being detected in the first channel will gradually increase. Based on this pattern, the detection results obtained during the bandwidth increment process can more accurately determine whether the target ONT is an abnormal ONT.

[0013] In one possible implementation, the first channel is a 50G PON channel with a first wavelength range of 1284–1288 nanometers (nm). Since the wavelength range of the signal emitted by the 50G PON ONT is 1284–1288 nm, when the first wavelength range corresponding to the first channel of the 50G PON is the same as the wavelength range of the signal emitted by the 50G PON ONT, the signal emitted by the 50G PON ONT can be received in the first channel, thus achieving detection. In a 50G PON scenario, for ONTs using FP lasers, if the wavelength of the signal from an ONT using an FP laser drifts due to temperature, shifting from a second or third range to the first range, the method of this application can accurately determine the ONT whose wavelength has drifted, i.e., accurately detect ONTs using FP lasers.

[0014] In one possible implementation, the second channel is a 10G EPON and EPON channel, with a second wavelength range of 1260–1280 nm and a third wavelength range of 1290–1330 nm. Since the wavelength range of the signals emitted by the ONTs of 10G EPON and EPON is 1260–1280 nm or 1290–1330 nm, when the second and third wavelength ranges corresponding to the second channel of 10G EPON and EPON are the same as the wavelength range of the signals emitted by the ONTs of 10G EPON and EPON, the second channel can accurately receive the signals emitted by the ONTs of 10G EPON and EPON.

[0015] In one possible implementation, the detection device is an optical line terminal (OLT). Located within the OLT, the detection device can detect whether the target ONT is an abnormal ONT upon receiving its signal. This allows for the detection of abnormal ONTs while the OLT is conducting services with a connected second ONT, thus improving detection efficiency.

[0016] Secondly, a detection device is provided. The detection device is connected to a first ONT via a first channel and to a second ONT via a second channel. The wavelength range received by the first channel is a first wavelength range, and the wavelength range received by the second channel is a second wavelength range and a third wavelength range. The first wavelength range is located between the second wavelength range and the third wavelength range. The detection device includes: an authorization module, used to authorize a first bandwidth to a target ONT without authorizing bandwidth to the first ONT, wherein the first bandwidth is greater than a first bandwidth threshold, and the target ONT is any one of the second ONTs; a detection module, used to detect the signal of the target ONT via the first channel and obtain a signal detection result; and a determination module, used to determine whether the target ONT is an abnormal ONT based on the signal detection result.

[0017] In one possible implementation, a detection module is used to detect the RSSI of the target ONT in the first channel to obtain the RSSI detection result of the target ONT; and a determination module is used to determine whether the target ONT is an abnormal ONT based on the RSSI detection result of the target ONT.

[0018] In one possible implementation, a detection module is used to detect the RSSI of the target ONT multiple times in a first reference time period in a first channel to obtain RSSI detection results; and a determination module is used to determine that the target ONT is an abnormal ONT when the RSSI detection results indicate that the number of detected RSSIs has reached a number threshold.

[0019] In one possible implementation, a detection module is used to perform SD on the signal of the target ONT in the first channel to obtain the SD detection result of the target ONT signal. When the signal of the target ONT is detected, the SD detection result indicates a first level, and when the signal of the target ONT is not detected, the SD detection result indicates a second level. A determination module is used to determine whether the target ONT is an abnormal ONT based on the SD detection result of the target ONT signal.

[0020] In one possible implementation, a detection module is used to perform multiple signal detection (SD) tests on the target ONT's signal on the first channel within a second reference time period to obtain multiple SD detection results; a determination module is used to determine that the target ONT is an abnormal ONT when the number of SD detection results indicating a first level among the multiple SD detection results reaches a number threshold.

[0021] In one possible implementation, the authorization module is further configured to authorize a second bandwidth to a second ONT other than the target ONT, the second bandwidth being less than a second bandwidth threshold, and the second bandwidth threshold being less than a first bandwidth threshold.

[0022] In one possible implementation, the authorization module is further configured to sequentially authorize at least two third bandwidths to the target ONT, wherein the at least two third bandwidths are sequentially increased, and both of the at least two third bandwidths are greater than a second bandwidth threshold and less than a first bandwidth threshold, wherein the second bandwidth threshold is less than the first bandwidth threshold.

[0023] In one possible implementation, the first channel is a 50G PON channel with a first wavelength range of 1284–1288 nanometers.

[0024] In one possible implementation, the second channel is a 10G EPON and EPON channel, the second wavelength range is 1260–1280 nm, and the third wavelength range is 1290–1330 nm.

[0025] In one possible implementation, the detection device is an OLT.

[0026] Thirdly, an optical line terminal (OLT) is provided. The OLT includes a PON media access control (MAC) chip and a PON optical module. The PON optical module is connected to a first ONT through a first channel and to a second ONT through a second channel. The wavelength range received by the first channel is a first wavelength range, and the wavelength range received by the second channel is a second wavelength range and a third wavelength range. The first wavelength range is located between the second wavelength range and the third wavelength range. The PON MAC chip is used to authorize a first bandwidth to the target ONT without authorizing the first ONT. The PON optical module is used to detect the signal of the target ONT through the first channel and obtain the signal detection result. The PON MAC chip is also used to obtain the signal detection result and determine whether the target ONT is an abnormal ONT based on the signal detection result.

[0027] In one possible implementation, a PON optical module is used to detect the RSSI of the target ONT in the first channel to obtain the RSSI detection result of the target ONT; a PON MAC chip is used to determine whether the target ONT is an abnormal ONT based on the RSSI detection result of the target ONT.

[0028] In one possible implementation, the PON optical module is used to detect the RSSI of the target ONT multiple times in the first channel within a first reference time period to obtain the RSSI detection result; the PON MAC chip is used to determine that the target ONT is an abnormal ONT when the RSSI detection result indicates that the number of detected RSSIs has reached a number threshold.

[0029] In one possible implementation, a PON optical module is used to perform SD detection on the signal of the target ONT in the first channel to obtain the SD detection result of the target ONT signal. When the signal of the target ONT is detected, the SD detection result indicates a first level, and when the signal of the target ONT is not detected, the SD detection result indicates a second level. A PON MAC chip is used to determine whether the target ONT is an abnormal ONT based on the SD detection result of the target ONT signal.

[0030] In one possible implementation, the PON optical module is used to perform multiple signal detection (SD) tests on the target ONT's signal on the first channel within a second reference time period to obtain multiple SD detection results; the PON MAC chip is used to determine that the target ONT is an abnormal ONT when the number of SD detection results indicating the first level among the multiple SD detection results reaches a number threshold.

[0031] In one possible implementation, the PON MAC chip is also used to authorize a second bandwidth to a second ONT other than the target ONT, the second bandwidth being less than a second bandwidth threshold, and the second bandwidth threshold being less than a first bandwidth threshold.

[0032] In one possible implementation, the PON MAC chip is also used to sequentially authorize at least two third bandwidths to the target ONT, wherein the at least two third bandwidths are sequentially increased, and both of the at least two third bandwidths are greater than a second bandwidth threshold and less than a first bandwidth threshold, wherein the second bandwidth threshold is less than the first bandwidth threshold.

[0033] In one possible implementation, the first channel is a 50G PON channel with a first wavelength range of 1284–1288 nanometers.

[0034] In one possible implementation, the second channel is a 10G EPON and EPON channel, the second wavelength range is 1260–1280 nm, and the third wavelength range is 1290–1330 nm.

[0035] Fourthly, a passive optical network (PON) system is provided, comprising an OLT, a first ONT, and a second ONT; the OLT is connected to the first ONT via a first channel, and the OLT is connected to the second ONT via a second channel; the wavelength range received by the first channel is a first wavelength range, and the wavelength range received by the second channel is a second wavelength range and a third wavelength range, wherein the first wavelength range is located between the second wavelength range and the third wavelength range; the OLT is used to perform the optical network terminal detection method of the first aspect described above.

[0036] It should be understood that the beneficial effects achieved by the above-mentioned second to fourth aspects of the technical solutions and their corresponding possible implementations can be referred to the above-mentioned technical effects of the first aspect and its corresponding possible implementations, and will not be repeated here. Attached Figure Description

[0037] Figure 1 A schematic diagram illustrating the wavelength range of signals emitted by different ONTs, provided for embodiments of this application;

[0038] Figure 2 An implementation scenario diagram of a detection method for an optical network terminal provided in this application embodiment;

[0039] Figure 3 A flowchart illustrating a detection method for an optical network terminal provided in an embodiment of this application;

[0040] Figure 4 A schematic diagram illustrating the detection of an optical network terminal provided in an embodiment of this application;

[0041] Figure 5A schematic diagram illustrating another optical network terminal detection method provided in this application embodiment;

[0042] Figure 6 A schematic diagram illustrating the detection of another optical network terminal provided in an embodiment of this application;

[0043] Figure 7 A schematic diagram of a passive optical network system provided in an embodiment of this application;

[0044] Figure 8 A schematic diagram of another passive optical network system provided in the embodiments of this application;

[0045] Figure 9 This is a schematic diagram of the structure of a detection device provided in an embodiment of this application. Detailed Implementation

[0046] The terminology used in the implementation section of this application is for the purpose of explaining specific embodiments of this application only, and is not intended to limit this application.

[0047] With the development of PON technology, it has gradually become the mainstream technology for fixed broadband access. PON includes an OLT, an optical distribution network (ODN), and multiple ONTs. The OLT connects multiple ONTs through the ODN, forming a point-to-multipoint PON system, realizing the connection between the network backbone and the corresponding end users of the ONTs, i.e., the "last mile" of the optical network.

[0048] In a PON system network, the OLT is the upstream device, and the ONT is the downstream device. During downlink communication in the PON system, the OLT broadcasts messages to all ONTs connected to it. Each ONT selects its own message according to the protocol after receiving the message. During uplink communication in the PON system, each ONT communicates with the OLT in the form of burst packets carried by signals within a specified time slot using time division multiplexing (TDM), thereby avoiding collisions between signals sent by different ONTs.

[0049] PON includes GPON and EPON, which are based on different standards. In the process of PON technology development and evolution, the two standards have evolved into two generations of PON systems: GPON and 10G GPON in the GPON system, and EPON and 10GEPON in the EPON system.

[0050] The internationally standardized 50G PON has become the common choice for the next generation of PON in both standard systems, achieving unification of PON generational evolution. The implementation of each generation of PON technology must consider compatibility with the previous generation, or even two generations prior, to protect network investment and promote smooth network evolution. For example, when deploying 10G GPON, compatibility with GPON needs to be considered. This compatibility is achieved through wavelength division multiplexing (WDM), meaning that within the same PON network, terminals connected to both GPON and 10G GPON at the same PON port use different wavelengths for uplink and downlink, ensuring no interference. 10G EPON is slightly different; its downlink coexists with EPON WDM, but its uplink coexists with EPON terminals using time division multiplexing (TDM).

[0051] The deployment of 50G PON also needs to consider the issue of smooth evolution. Therefore, the standard defines different uplink and downlink wavelengths for 50G PON compared to GPON and 10G GPON. This means that the three generations of PON achieve coexistence and smooth evolution through wavelength division multiplexing (WDM). Since 50G PON is also the next-generation standard for EPON and 10G EPON, the issue of coexistence and evolution with EPON and 10G EPON must also be considered. Currently, EPON and 10G EPON use downlink WDM multiplexing and uplink time division multiplexing (TDM). However, the bandwidth allocation mechanisms and methods of 50G GPON and 10G EPON are different. Uplink TDM faces a series of challenges. Therefore, the industry generally chooses for 50G PON uplink to coexist with EPON and 10G EPON WDM.

[0052] Therefore, in 50G & 10G EPON & EPON OLT optical modules, there are typically two receiving channels: one channel for receiving uplink signals from the 50G EPON ONT, and the other channel for receiving uplink signals from the 10G EPON ONT and EPON ONT. However, EPON ONT and 10G EPON ONT have various uplink wavelengths, including 1270±10nm, 1310±20nm, and 1310±50nm. 1310±50nm is the wavelength range of the signal emitted by the EPON ONT using an FP laser. The effective wavelength range of FP lasers is typically 20–30nm, and it drifts with temperature changes. That is, as the temperature rises, the wavelength range of the signal shifts to longer wavelengths, and as the temperature falls, the wavelength range of the signal shifts to shorter wavelengths. The wavelength of the signal emitted by the FP laser may overlap with the wavelength of the signal emitted by the 50G EPON ONT (1286±2nm).

[0053] For example, see Figure 1The diagram illustrates the wavelength ranges of signals emitted by different ONTs. The wavelength ranges of signals emitted by the 10G EPONONT include 1270±10nm, 1310±20nm, and 1310±50nm, while the wavelength range of signals emitted by the 50G PON ONT is 1286±2nm. As can be seen from the diagram, the wavelength range of the signals emitted by the EPON ONT using an FP laser (1310±50nm) overlaps with the wavelength range of the signals emitted by the 50G PON ONT (1286±2nm).

[0054] However, the key to wavelength division multiplexing (WDM) coexistence lies in the different wavelength ranges of signals emitted by different types of ONTs. Therefore, when the wavelength range of the signal emitted by an EPON ONT using an FP laser overlaps with that of the signal emitted by a 50G PON ONT, reliable WDM coexistence cannot be achieved. This is because, to achieve WDM coexistence between 50G PON, EPON, and 10G EPON, the wavelength range of the signal received by the 50G receiving channel within the OLT optical module is 1286±2nm, while the wavelength ranges of the signals received by the 10G EPON and EPON receiving channels are 1270±10nm and 1310±20nm, respectively. The signal emitted by the EPON ONT using an FP laser may interfere with the channel receiving the 50G PON ONT signal, thus affecting the signal quality received by that channel.

[0055] Furthermore, during the deployment of 50G PON to EPON areas, EPON ONTs with a wide wavelength range generally fall into two categories. One category emits signals whose wavelength range is outside the reception range of the 10G EPON & EPON receiving channels, meaning the spectral energy is mostly distributed between 1280 and 1290 nm. Operators will replace these terminals if they fail to go online. The other category consists of terminals whose wavelength range is within the reception range of the 10G EPON & EPON receiving channels, meaning the wavelength is mostly distributed between 1260 and 1280 nm or 1290 and 1330 nm. These terminals can go online normally, and operators cannot locate them. However, when the ambient temperature of the terminals changes, the wavelength of the signals emitted by EPON ONTs using FP lasers will drift, potentially affecting the 50G signal quality. These EPON ONTs using FP lasers become a key obstacle to the smooth deployment of 50G PON. To achieve a smooth evolution of 50G PON, it is necessary to identify and replace EPON ONTs using FP lasers in the existing network to minimize the impact on 50G PON.

[0056] In related technologies, the equipment information reported by the ONT is usually compared with the equipment manufacturer's shipping information to identify ONTs using FP lasers. However, since ONTs using FP lasers are generally older models, and most ONT manufacturers are small, information on many manufacturers is difficult to find. Therefore, relying on related technologies cannot completely identify ONTs using FP lasers. Furthermore, EPON ONTs using FP lasers are widely deployed in the current network, accounting for over 85%, resulting in a large number of them. Therefore, using the methods provided by related technologies for identification is inefficient, time-consuming, and labor-intensive.

[0057] This application provides a method for detecting optical network terminals, which can accurately detect abnormal ONTs with higher efficiency. Abnormal ONTs are those that affect the signal quality of 50GPON, such as ONTs using FP lasers. See also... Figure 2 The diagram illustrates an implementation scenario of a detection method for an optical network terminal provided in this application. This implementation scenario includes a first ONT 21, a second ONT 22, and a detection device 23. The detection device can be an OLT, or it can be deployed within an OLT.

[0058] The detection device 23 includes a first channel and a second channel. The first and second channels can be channels for receiving signals from different types of ONTs. Since the wavelength ranges of signals emitted by different types of ONTs are different, the first and second channels can be channels for receiving different wavelength ranges. For example, the first channel receives a first wavelength range, and the second channel receives a second wavelength range and a third wavelength range, with the first wavelength range located between the second and third wavelength ranges. For instance, if the first channel is a 50GPON channel, i.e., a channel for receiving signals from 50G PON ONTs, then the first wavelength range can be 1284–1288 (or expressed as 1286±2) nm. If the second channel is a 10G EPON and EPON channel, i.e., a channel for receiving signals from 10G EPON and EPON ONTs, then the second wavelength range can be 1260–1280 (or expressed as 1270±10) nm, and the third wavelength range can be 1290–1330 (or expressed as 1310±20) nm.

[0059] The detection device 23 is connected to the first ONT 21 via a first channel and to the second ONT 22 via a second channel. The first ONT 21 is an ONT corresponding to the wavelength range received by the first channel; for example, if the first channel is a 50G PON channel, then the first ONT 21 is a 50G PON ONT. The second ONT 22 is an ONT corresponding to the wavelength range received by the second channel; for example, if the second channel is a 10G EPON or EPON channel, then the second ONT 22 is at least one of 10G EPON or EPON ONT. The first channel and the first ONT 21 can be connected via an optical distribution network (ODN), which may include optical fiber cables and couplers. The first channel can connect to one or more first ONTs 21. Correspondingly, the second channel and the second ONT 22 can also be connected via an ODN. The second channel can connect to one or more second ONTs 22. The multiple second ONT22 connected to the second channel can be of the same or different types. For example, the multiple second ONT22 can all be 10G EPON ONTs, or all be EPON ONTs, or the multiple second ONT22 can include both 10G EPON ONTs and EPON ONTs. EPON ONTs can be ONTs that include FP lasers, or ONTs that include other types of lasers.

[0060] See Figure 3 The diagram illustrates a flowchart of a detection method for an optical network terminal according to an embodiment of this application. This method can be applied to the above-described implementation scenario and is executed by a detection device. The method includes, but is not limited to, steps S301 to S303 below.

[0061] S301, without granting bandwidth to the first ONT, grant the first bandwidth to the target ONT, the first bandwidth being greater than the first bandwidth threshold, and the target ONT being any one of the second ONTs.

[0062] The abnormal ONT to be detected in this embodiment is an EPON ONT using an FP laser, also known as a broadband terminal. As explained above, when an EPON ONT using an FP laser is affected by temperature, the wavelength of the signal emitted by it will shift, potentially overlapping with the wavelength range received by the first channel. Therefore, the first channel may receive a signal emitted by an EPON ONT using an FP laser. However, the signal emitted by the EPON ONT using an FP laser will affect the quality of the signal emitted by the 50G PON ONT that the first channel should receive, causing bit errors in the received signal and thus affecting the quality of the service corresponding to the first channel. Therefore, when abnormal situations such as a decrease in the quality of the service corresponding to the first channel or an increase in bit errors in the signal received by the first channel occur, it indicates that the first channel may have received a signal emitted by an EPON ONT using an FP laser, meaning that an EPON ONT using an FP laser may exist in the second ONT connected to the detection device. Based on this, when abnormal situations such as a decrease in the quality of the service corresponding to the first channel or an increase in bit errors in the signal received by the first channel occur, the various processes of the optical network terminal detection method provided in this embodiment can be triggered to detect the abnormal ONT.

[0063] In addition, the detection device can also perform abnormal ONT detection at specified intervals according to a specified frequency. That is, regardless of whether an abnormality occurs in the first channel, abnormal ONT detection can be performed at specified time intervals.

[0064] During the detection process, to avoid the first ONT affecting the detection results of the first channel, the detection device does not grant bandwidth to the first ONT. If bandwidth granting has already been granted to the first ONT before detection, the granting of the first ONT can be turned off or canceled to create a time idle window during the uplink time period. The time idle window refers to the time period from the time the granting of the first ONT is turned off or canceled to the time the granting of the first ONT is restored. During this time period, the signal emitted by the first ONT cannot be transmitted uplink to the first channel of the detection device, and the first channel cannot receive the signal from the first ONT.

[0065] During this time period, a first bandwidth grant is applied to the target ONT within the second ONT. This process of granting the first bandwidth to the target ONT can be called maximum bandwidth grant. Within the time slot corresponding to the target ONT, the target ONT's signal can be transmitted to the detection device based on the granted first bandwidth. Under normal circumstances, the first channel will not receive a signal during this time period, and the target ONT's signal will be transmitted to the second channel. However, if the target ONT is abnormal, its signal may be transmitted to the first channel. Furthermore, because the first bandwidth granted to the target ONT is relatively large, if the target ONT is abnormal, its signal is more likely to be received by the first channel. Therefore, by checking whether the first channel receives the target ONT's signal during this time period, it can be determined whether the target ONT is abnormal.

[0066] In one possible implementation, the method further includes: granting a second bandwidth to second ONTs other than the target ONT, where the second bandwidth is less than a second bandwidth threshold, and the second bandwidth threshold is less than a first bandwidth threshold. The second bandwidth threshold is a bandwidth value that will not affect the signal transmission of the target ONT, and can be set based on experience or detection accuracy. The process of granting a second bandwidth to the remaining second ONTs (i.e., second ONTs other than the target ONT) can be called minimum bandwidth granting. The detection device can perform minimum bandwidth granting on the remaining second ONTs after closing or canceling the bandwidth granting of the first ONT, or before closing or canceling the bandwidth granting of the first ONT.

[0067] See Figure 4 The diagram illustrates a detection method for an optical network terminal provided in an embodiment of this application. Figure 4 The EPON channel in the diagram is also known as the second channel, and the 50G channel is known as the first channel. Minimum bandwidth is a form of the second bandwidth. Because time-division multiplexing is used for compatible transmission of EPON uplink signals, the signal reception time of the EPON channel can be divided into multiple time slots. Within a time slot, different EPON ONTs transmit signals to the detection device through different time slots (bandwidth is a representation of bandwidth in the time dimension) according to their authorized bandwidth. For example, Figure 4 In the EPON channel, a rectangle corresponds to a time period, which is divided into different time slots. A second ONT authorized with the minimum bandwidth transmits a signal to the detection device in its corresponding time slot (the rectangle corresponding to the minimum bandwidth) based on the minimum bandwidth.

[0068] See Figure 5 This diagram illustrates another optical network terminal detection method provided in an embodiment of this application. Figure 5 and Figure 4 The difference is that, Figure 5The target ONT (i.e., the ONT to be detected) is granted the first bandwidth, which is greater than the second bandwidth of other second ONTs, meaning the target ONT occupies most of the time slots. Figure 5 The black rectangles in the diagram represent the time slots of the target ONT (e.g., 90% of the time slots), while the other second ONTs occupy very few time slots. Figure 5 The white rectangle in the image represents the sum of the time slots of the other second ONTs (e.g., 10% of the time slots). From... Figure 5 It can be seen that by granting a first bandwidth to the target ONT and a second bandwidth to the other second ONTs, the bandwidth for transmitting signals from the other second ONTs after granting the first bandwidth to the target ONT is less than the bandwidth for transmitting signals from the target ONT. This reduces the probability of detecting the signals or signal power of the other second ONTs during detection, but increases the probability of detecting the signals or signal power of the target ONT. In other words, it reduces the interference caused by the signals of the other second ONTs to the detection of the target ONT signal, ensuring a high probability of detecting the target ONT signal during the detection process. Furthermore, the second ONTs can still continue to provide services during detection, minimizing service loss during the detection process.

[0069] In one possible implementation, besides granting a first bandwidth to the target ONT all at once, the target ONT can also be granted incremental bandwidths multiple times until the bandwidth granted to the target ONT reaches the first bandwidth. For example, the detection device can sequentially grant the target ONT at least two third bandwidths, with the at least two third bandwidths increasing sequentially, and both of the at least two third bandwidths being greater than a second bandwidth threshold and less than the first bandwidth threshold, where the second bandwidth threshold is less than the first bandwidth threshold.

[0070] For example, taking bandwidth as a time dimension representation, the first bandwidth threshold refers to occupying 80% of the bandwidth slots within an uplink allocation cycle, and the second bandwidth threshold is 0.5% of the bandwidth slots. The total bandwidth slots in an uplink allocation cycle are 125 μs. Therefore, the detection device can first authorize a third bandwidth of 60 μs for the target ONT, then authorize a third bandwidth of 80 μs for the target ONT, and finally authorize a first bandwidth of 100 μs for the target ONT. (See also...) Figure 6 This diagram illustrates another optical network terminal detection method provided in an embodiment of this application. Figure 6 It can be seen that the bandwidth authorized by the detection device for the target ONT gradually increases from the third bandwidth 1 to the third bandwidth 2 and then to the first bandwidth.

[0071] In this embodiment, whether the target ONT is granted incremental bandwidth up to the first bandwidth or directly granted the first bandwidth, a time idle window can be constructed, and bandwidth can be granted to the target ONT within the time idle window to achieve dynamic bandwidth allocation (DBA) and reduce the impact of the first ONT's signal. It should be noted that the bandwidth granted or allocated to each ONT is the uplink bandwidth, that is, the bandwidth in the direction from which the signal emitted by the ONT is transmitted to the detection device. This embodiment does not limit the downlink bandwidth for signal transmission from the detection device to each ONT.

[0072] S302 detects the signal of the target ONT in the first channel and obtains the signal detection result.

[0073] The detection device typically includes a beam splitter, which transmits the signal to the appropriate channel based on the wavelength of the received signal. For example, a signal belonging to a first wavelength range is transmitted to the first channel, while a signal belonging to a second or third wavelength range is transmitted to the second channel. In the aforementioned S301, the detection device has already disabled or revoked bandwidth authorization for all first ONTs; therefore, the first channel should not receive a signal in the absence of an abnormal ONT. However, if an abnormal ONT exists, the wavelength of the signal emitted by the abnormal ONT will drift due to temperature changes, causing the signal emitted by the abnormal ONT to be transmitted to the first channel by the beam splitter. This application utilizes this characteristic to detect the target ONT's signal at the first channel to determine whether the target ONT is abnormal.

[0074] In the embodiments of this application, the signal of the target ONT can be detected in the first channel in different ways, and the corresponding signal detection results can be obtained. The following uses cases A1 and A2 as examples to illustrate two different detection methods.

[0075] Case A1: Detect the signal of the target ONT in the first channel and obtain the signal detection result, including: detect the RSSI of the target ONT in the first channel and obtain the RSSI detection result of the target ONT.

[0076] RSSI is a method of measuring received signal strength. If no signal is received on the first channel, RSSI detection is performed on the first channel, and the obtained RSSI value is a default value. The default value may be a very low negative value, such as negative infinity (-∞) decibel-milliwatts (dBm), indicating that no measurable signal was received. Alternatively, noise generated by the detection device or noise in the environment in which the detection device is located may affect the RSSI value. Therefore, even if no signal is received, the default value of RSSI may not be -∞dBm, but a lower negative value or a lower negative range. For example, the default value may be -90dBm or lower, indicating very poor signal reception, with only noise detectable.

[0077] If the first channel receives signals transmitted by any one or more ONTs, RSSI detection is performed on the first channel, and the obtained RSSI value will be higher than the default value. For example, if the received signal is strong (high intensity), the detected RSSI value may be between -5dBm and -15dBm; if the received signal is good (moderate intensity), the detected RSSI value may be between -15dBm and -25dBm; if the received signal is weak (low intensity), the detected RSSI value may be between -25dBm and -35dBm, or even lower.

[0078] In this embodiment, if the RSSI value detected in a single detection is higher than the default value, it can be considered that the first channel has received a signal. Furthermore, it can be considered that the first channel has received a signal emitted by the target ONT. Alternatively, the RSSI detection result of the target ONT can be determined as the receipt of a signal from the target ONT, or the detected RSSI value can be used as the RSSI detection result of the target ONT, indicating whether the first channel has received a signal from the target ONT.

[0079] Since determining the RSSI detection result of the target ONT through a single detection may be random or result in false detection, or the detected received signal may be a signal emitted by another abnormal ONT, in this embodiment of the application, detecting the Received Signal Strength Indicator (RSSI) of the target ONT in the first channel to obtain the RSSI detection result of the target ONT may further include: detecting the RSSI of the target ONT multiple times in the first channel within a first reference time period to obtain the RSSI detection result.

[0080] The first reference duration, also known as the sampling time, can be determined empirically or based on detection accuracy. For example, the first reference duration could be 10 seconds (s). Within the first reference duration, the RSSI of the target ONT can be detected intermittently on the first channel. The time interval between two adjacent detections can be fixed or variable; for example, the time interval between the first and second detections could be 125 μs, and the time interval between the second and third detections could be 125 μs or 500 μs, etc. The process for each detection is the same as the process for performing one detection described above, and will not be repeated here. See [link to documentation]. Figures 4-6 The schematic diagram of the detection shown has a maximum sampling time (first reference duration) of 10 seconds. The 50G channel (first channel) can be detected (checked) once every 125μs (approximately), for a total of 20 detections.

[0081] Optionally, a time idle window can be created for each RSSI detection, that is, bandwidth authorization for the first ONT is closed or canceled before each RSSI detection, and the target ONT is authorized with the initial bandwidth followed by incremental bandwidth. Alternatively, multiple RSSI detections can be performed within a single time idle window.

[0082] After the first channel detects the RSSI of the target ONT multiple times, the obtained RSSI detection result can be the number of times the first channel receives a signal within the first reference duration (that is, the number of times the RSSI value is greater than the default value), or the obtained RSSI detection result can be multiple values ​​of RSSI obtained from multiple detections. The multiple values ​​of RSSI obtained from multiple detections indicate the number of times the first channel receives a signal within the first reference duration.

[0083] The method shown in A1 above is a detection method based on RSSI, which can be called random idle RSSI detection. The RSSI detection result of the target ONT is the signal detection result.

[0084] Case A2: Detect the signal of the target ONT in the first channel and obtain the signal detection result, including: perform SD on the signal of the target ONT in the first channel to obtain the SD detection result of the target ONT signal.

[0085] SD (Signal Detection) is a signal detection mechanism where the signal level changes (or flips) when a signal is detected. For example, when a signal from the target ONT is detected, the SD detection result indicates a first level; when no signal from the target ONT is detected, the SD detection result indicates a second level. The embodiments of this application do not limit the content of the first and second levels; for example, the first level can be high, and the second level can be low. By performing SD on the target ONT's signal on the first channel, it is possible to accurately determine whether the first channel has received the target ONT's signal, thereby accurately determining whether the target ONT is an abnormal ONT.

[0086] Since determining the SD detection result of the target ONT through a single detection may be random or result in false detections, or the detected received signal may be from another abnormal ONT, this embodiment of the application, in addition to performing signal detection SD on the target ONT's signal on the first channel to obtain the SD detection result of the target ONT's signal, may further include: performing SD multiple times on the target ONT's signal on the first channel within a second reference time period to obtain multiple SD detection results. The obtained SD detection result or multiple SD detection results constitute the obtained signal detection result.

[0087] It should be understood that situations A1 and A2 described above are merely examples. Embodiments of this application can also detect whether the first channel has received a signal and the number of times the first signal has been received through other means. Furthermore, during detection, the detection device can employ a single method or a combination of multiple methods to achieve detection.

[0088] S303, determine whether the target ONT is an abnormal ONT based on the signal detection results.

[0089] The signal detection result can indicate whether the first channel has received a signal. Under normal circumstances, the first channel should not receive a signal when the first ONT is not authorized. Therefore, by detecting whether the first channel has received a signal, it is possible to determine whether there is an abnormal ONT and further determine whether the abnormal ONT is the target ONT.

[0090] Based on the different processes for obtaining signal detection results in S302 and the different contents of the obtained signal detection results, the methods for determining whether the target ONT is an abnormal ONT based on the signal detection results in this application embodiment are also different. For example, corresponding to the above-mentioned cases A1 and A2, the methods for determining whether the target ONT is an abnormal ONT based on the signal detection results can be divided into the following cases B1 and B2.

[0091] Case B1: Corresponding to Case A1, determine whether the target ONT is an abnormal ONT based on the signal detection results, including: determining whether the target ONT is an abnormal ONT based on the RSSI detection results of the target ONT.

[0092] If the RSSI detection result of the target ONT shows that a signal has been received from the target ONT, then the target ONT is determined to be abnormal. If the RSSI detection result of the target ONT shows that a signal has not been received from the target ONT, then the target ONT is determined to be normal. Alternatively, if the RSSI detection result of the target ONT is a value indicating that a signal has been received from the target ONT, then the target ONT is determined to be abnormal. If the RSSI value indicates that a signal has not been received from the target ONT, then the target ONT is determined to be normal.

[0093] As can be seen from the foregoing description, the embodiments of this application can also detect the RSSI of the target ONT multiple times in the first channel within the first reference time period to obtain the RSSI detection result. In this case, based on the RSSI detection result of the target ONT, it is determined whether the target ONT is an abnormal ONT, including: if the RSSI detection result indicates that the number of detected RSSIs reaches the number threshold, the target ONT is determined to be an abnormal ONT.

[0094] If the RSSI detection result of the target ONT is the number of times the first channel receives a signal within the first reference duration, then if this number reaches a threshold, the target ONT is determined to be an abnormal ONT; otherwise, the target ONT is determined not to be an abnormal ONT. If the RSSI detection result of the target ONT is multiple RSSI values ​​obtained from multiple detections, then if the number of received signals indicated by these multiple values ​​reaches a threshold, the target ONT is determined to be an abnormal ONT; otherwise, if the number of received signals indicated by these multiple values ​​does not reach the threshold, the target ONT is determined not to be an abnormal ONT.

[0095] Case B2: Corresponding to Case A2, determine whether the target ONT is an abnormal ONT based on the signal detection results, including: determining whether the target ONT is an abnormal ONT based on the SD detection results of the target ONT's signal.

[0096] If the SD detection result of the target ONT's signal indicates the first level, it means that a signal was detected in the first channel. Therefore, it can be concluded that the target ONT's signal has been detected, and thus the target ONT can be determined to be an abnormal ONT. Conversely, if the SD detection result of the target ONT's signal indicates the second level, it means that no signal was detected in the first channel, and thus the target ONT can be determined to be not an abnormal ONT.

[0097] As can be seen from the foregoing description, the embodiments of this application can also perform multiple SD detections on the target ONT signal in the first channel within the second reference time period to obtain multiple SD detection results. In this case, based on the SD detection results of the target ONT signal, it is determined whether the target ONT is an abnormal ONT, including: if the number of SD detection results indicating the first level in the multiple SD detection results reaches a number threshold, the target ONT is determined to be an abnormal ONT.

[0098] If the number of SD detection results indicating the first level in multiple detection results reaches the number threshold, it means that the number of times the signal is detected in the first channel has reached the number threshold, and the target ONT can be determined to be an abnormal ONT. If the number of SD detection results indicating the first level in multiple detection results does not reach the number threshold, it means that the number of times the signal is detected in the first channel is relatively small, and the target ONT can be determined not to be an abnormal ONT.

[0099] In one possible implementation, the detection device may authorize a minimum bandwidth for all second ONTs before detecting the target ONT. After authorizing the minimum bandwidth for all second ONTs, after disabling or canceling bandwidth authorization for the first ONT, and before authorizing a first bandwidth for the target ONT, it can be determined whether a signal from a second ONT can be detected on the first channel and the number of times the signal from a second ONT is detected. This number reflects whether the signals from all second ONTs will crosstalk to the first channel before the first bandwidth is authorized for the target ONT, and the number of times the signals from all second ONTs crosstalk to the first channel. Therefore, in this embodiment, the signal detected on the first channel may be a signal from another second ONT besides the target ONT. Thus, the method for determining whether the target ONT is abnormal based on the number of times the signal from a second ONT is detected on the first channel may include: when determining whether the target ONT is an abnormal ONT, the number of signals from second ONTs detected can be removed from the number of detected signals indicated by the detection result, and the target ONT is determined to be abnormal based on the number after removal.

[0100] For example, if RSSI detection is performed on the signal of the target ONT and the signals of all second ONTs based on the methods in cases A1 and B1, the number of RSSIs detected as indicated by the RSSI detection results of the target ONT can be subtracted from the number of RSSIs detected before the first bandwidth was granted to the target ONT to obtain a quantity difference, and then the quantity difference is compared with a quantity threshold. Correspondingly, if SD detection is performed on the signal of the target ONT and the signals of all second ONTs based on the method in case A2, the number of SD detection results indicating the first level obtained in case A2 can be subtracted from the number of SD detection results indicating the first level obtained before the first bandwidth was granted to the target ONT to obtain a quantity difference, and then the quantity difference is compared with a quantity threshold.

[0101] If the difference in quantity reaches the quantity threshold, it means that even after removing the influence of other second ONT signals, the number of crosstalk signals from the target ONT to the first channel is still relatively high, thus the target ONT can be determined to be an abnormal ONT. If the difference in quantity does not reach the quantity threshold, the target ONT can be considered a normal ONT.

[0102] Taking RSSI detection of the target ONT's signal and all second ONTs as an example, if the target ONT's RSSI detection result indicates 15 detected RSSIs, and the number of RSSIs detected before granting the first bandwidth to the target ONT was 1, with a threshold of 10, then the difference of 14 is greater than the threshold of 10, indicating that the target ONT is an abnormal ONT. However, if the target ONT's RSSI detection result indicates 10 detected RSSIs, and the number of RSSIs detected before granting the first bandwidth to the target ONT was 5, with a threshold of 10, then the difference of 5 is less than the threshold of 10. This suggests that the target ONT's RSSI detection result is significantly influenced by the signals of other second ONTs, and more than 5 of the detected RSSIs may originate from other second ONTs. Therefore, the target ONT can be identified as a non-abnormal ONT.

[0103] In another possible implementation, the influence of other second ONT signals on the detection results is considered when determining the quantity threshold. For example, the quantity threshold can be the sum of the maximum number of detections that identifies the target ONT as an aberrant ONT and the number of times all detected second ONTs crosstalk to the first channel. For instance, in the various cases described above, if the maximum number of detections is 10, meaning the number of signals from the target ONT detected within the first reference duration is greater than 10, the target ONT can be considered an aberrant ONT. If the number of RSSIs detected before granting the first bandwidth to the target ONT is 2, the quantity threshold can be set to 12. Thus, if the RSSI detection result of the target ONT indicates a detected RSSI count greater than 12, the number of signals from the actual target ONT detected may be greater than 10, thus identifying the target ONT as an aberrant ONT. However, if the maximum number of detections is used as the quantity threshold, the target ONT might be identified as an aberrant ONT even if the number of signals from the actual target ONT detected is less than or equal to 8, potentially leading to misjudgment. Correspondingly, in cases A2 and B2, the quantity threshold can also be determined based on a similar method, which will not be elaborated here. In this embodiment of the application, the influence of the signals of other second ONTs on the detection results is considered when determining the quantity threshold, which can further improve the accuracy of detection and reduce the possibility of misjudgment.

[0104] In one possible implementation described above, the detection device can grant the target ONT incremental bandwidth multiple times. In this implementation, regardless of whether it's case B1 or case B2, if the number of detected signals, including or indicated by the signal detection result, increases with the increase in bandwidth, it can be proven that the detected signals include the target ONT's signals, thus more accurately determining whether the target ONT is an abnormal ONT. However, if the number of detected signals, including or indicated by the signal detection result, does not increase with the increase in bandwidth, then even if a signal is detected on the first channel, it may not be the target ONT's signal. Therefore, a more precise determination can be made to determine whether the target ONT is an abnormal ONT.

[0105] For example, the degree of signal degradation in the first channel can be used to determine whether the target ONT is an abnormal ONT. If the signal degradation in the first channel increases as the bandwidth allocated to the target ONT increases, even if the number of detected signals does not increase, it may be due to an unreasonable sampling interval setting causing a deviation in the detection results, thus identifying the target ONT as an abnormal ONT. Conversely, if the signal degradation in the first channel remains unchanged and the number of detected signals does not increase as the bandwidth allocated to the target ONT increases, then the target ONT can be considered not to be an abnormal ONT. By using multiple dimensions to determine whether the target ONT is an abnormal ONT, the possibility of false detection can be reduced.

[0106] The above describes the method and process for detecting a second ONT. After completing the detection of a second ONT, the same method and process can be used to re-detect other second ONTs until all second ONTs are detected, thus identifying abnormal ONTs.

[0107] After identifying each abnormal ONT, its location can be determined based on its online registration information. Maintenance personnel can then conduct on-site replacements at the identified locations, replacing the abnormal ONTs with other ONTs that will not affect the 50GPON connection. The online registration information can be any information that can be used to determine the location of the abnormal ONT, such as its MAC address.

[0108] In summary, by not granting bandwidth to the first ONT and granting the target ONT a bandwidth greater than a first bandwidth threshold, the target ONT's signal is not affected by the first ONT's signal. This leads to more accurate detection of the target ONT's signal and improves the efficiency of the detection. Furthermore, since the target ONT is connected to the second channel and has not been granted bandwidth to the first ONT connected to the first channel, its signal wavelength should not be detected on the first channel, which is not connected to the target ONT, provided that the wavelength of the target ONT's signal does not overlap with that of the first ONT. In other words, the target ONT's signal should not be detected during cross-channel detection. Therefore, based on the detection of the target ONT's signal at the first channel, it is possible to accurately determine whether the target ONT is abnormal. In other words, this application achieves abnormal ONT detection through cross-channel signal detection, resulting in high accuracy and efficiency.

[0109] In an exemplary embodiment, a passive optical network system is also provided, which includes an OLT, a first ONT, and a second ONT. The OLT is connected to the first ONT via a first channel and to the second ONT via a second channel. The first channel receives wavelengths within a first wavelength range, and the second channel receives wavelengths within a second wavelength range and a third wavelength range. The first wavelength range is located between the second wavelength range and the third wavelength range. The OLT is used to perform the aforementioned detection method for an optical network terminal.

[0110] See Figure 7 This diagram illustrates a passive optical network system provided in an embodiment of this application. The passive optical network system includes an OLT and 10G EPON and EPON. The 10G EPON and EPON are the second ONTs, and the EPONs include 1310FP EPON and 1296FP EPON. The first wavelength range is 1284–1288 nm, the second wavelength range is 1260–1280 nm, and the third wavelength range is 1290–1330 nm. The 50G RX is the first channel, and the EPON & 10G EPON RX are the second channels, which are connected to each of the second ONTs. Optionally, the second channels can be connected via an ODN (Optical Distribution Network). Figure 7 (Represented by black ellipses) The ODN can include couplers and fiber optic cables. Signals from the 10G EPON ONT and 1310FP EPON ONT (represented by dashed lines) are transmitted through the ODN to the OLT's EPON & 10G EPON RX. However, when drift occurs, the signal from the 1296FP EPON PNT (represented by bold curved solid lines) is partially transmitted through the ODN to the OLT, with some signals going to the 50G RX and others to the EPON & 10G EPON RX.

[0111] See Figure 8 The diagram shows another passive optical network system provided in the embodiments of this application. Figure 8 The passive optical network system shown is Figure 7 The difference between the passive optical network systems shown is: Figure 8 The passive optical network system shown also includes a 50G PON, with the 50GPON (first ONT) connected to the 50G RX. Optionally, the 50G PON can also be connected to the 50G RX via the ODN. The signal from the 50G PON ONT (indicated by dashed lines) is transmitted through the ODN to the OLT and then enters the 50G RX.

[0112] In an exemplary embodiment, an OLT is also provided, which includes a PON MAC chip and a PON optical module. The PON optical module is connected to a first ONT through a first channel and to a second ONT through a second channel. The first channel receives wavelengths within a first wavelength range, and the second channel receives wavelengths within a second wavelength range and a third wavelength range, wherein the first wavelength range is located between the second wavelength range and the third wavelength range. The PON MAC chip is used to authorize a first bandwidth to the target ONT without authorizing bandwidth to the first ONT. The PON optical module is used to detect the signal of the target ONT through the first channel and obtain a signal detection result. The PON MAC chip is also used to acquire the signal detection result and determine whether the target ONT is an abnormal ONT based on the signal detection result.

[0113] The first channel is a 50G PON channel with a first wavelength range of 1284–1288 nm. The second channel is a 10G EPON and EPON channel with a second wavelength range of 1260–1280 nm and a third wavelength range of 1290–1330 nm.

[0114] This OLT can be the OLT in the passive optical network system described above. See also Figure 7 or Figure 8 The OLT shown is a 50G PON device, including a 50G PON board. The 50G PON board includes a PON MAC chip and optical modules, and the number of PON MAC chips and optical modules can be one or more. The optical modules include 50G RX, EPON & 10G EPON RX, and a 50G detection channel connected to the 50G RX. The 50G detection channel can acquire a portion of the signal received by the first channel through methods such as beam splitting. The 50G detection channel includes functional circuits, such as at least one of RSSI circuits or SD circuits. When the OLT performs the above-described optical network terminal detection method, it can detect the signal of the target ONT in the first channel through the 50G detection channel; that is, it can acquire a portion of the signal received by the first channel through the 50G detection channel and detect that signal. For example, the RSSI value of the first channel can be detected by the RSSI circuit in the 50G detection channel, or the SD circuit in the 50G detection channel can perform SD on the first channel. Furthermore, the optical module may also include a beam splitter for transmitting the received signal to channels corresponding to the wavelengths.

[0115] In one possible implementation, the PON MAC chip is further configured to authorize a second bandwidth to a second ONT other than the target ONT, the second bandwidth being less than a second bandwidth threshold, and the second bandwidth threshold being less than a first bandwidth threshold. Alternatively, the PON MAC chip is further configured to sequentially authorize at least two third bandwidths to the target ONT, the at least two third bandwidths being sequentially increasing, and both of the at least two third bandwidths being greater than the second bandwidth threshold and less than the first bandwidth threshold, the second bandwidth threshold being less than the first bandwidth threshold.

[0116] For example, the PON optical module is used to detect the Received Signal Strength Indicator (RSSI) of the target ONT in the first channel to obtain the RSSI detection result of the target ONT; the PON MAC chip is used to determine whether the target ONT is an abnormal ONT based on the RSSI detection result of the target ONT.

[0117] Optionally, the PON optical module is used to detect the RSSI of the target ONT multiple times in the first channel within a first reference time period to obtain the RSSI detection result; the PON MAC chip is used to determine that the target ONT is an abnormal ONT when the RSSI detection result indicates that the number of detected RSSIs has reached a number threshold.

[0118] Alternatively, the PON optical module is used to perform signal detection (SD) on the target ONT signal in the first channel to obtain the SD detection result of the target ONT signal. When the target ONT signal is detected, the SD detection result indicates a first level, and when the target ONT signal is not detected, the SD detection result indicates a second level. The PON MAC chip is used to determine whether the target ONT is an abnormal ONT based on the SD detection result of the target ONT signal.

[0119] Optionally, the PON optical module is used to perform multiple signal detection (SD) tests on the target ONT's signal on the first channel within a second reference time period to obtain multiple SD detection results; the PON MAC chip is used to determine that the target ONT is an abnormal ONT when the number of SD detection results indicating the first level among the multiple SD detection results reaches a number threshold.

[0120] In an exemplary embodiment, a detection device is also provided. See also Figure 9 The diagram illustrates a structural schematic of a detection device according to an embodiment of this application. It should be understood that the device may include more additional modules than those shown, or may omit some of the modules shown; this application does not impose any limitations on this.

[0121] like Figure 9As shown, the detection device is connected to a first ONT via a first channel and to a second ONT via a second channel. The wavelength range received by the first channel is a first wavelength range, and the wavelength range received by the second channel is a second wavelength range and a third wavelength range. The first wavelength range is located between the second wavelength range and the third wavelength range. The detection device includes: an authorization module 901, used to authorize a first bandwidth to a target ONT without authorizing the first ONT, wherein the first bandwidth is greater than a first bandwidth threshold, and the target ONT is any one of the second ONTs; a detection module 902, used to detect the signal of the target ONT via the first channel and obtain a signal detection result; and a determination module 903, used to determine whether the target ONT is an abnormal ONT based on the signal detection result.

[0122] In one possible implementation, the detection module 902 is used to detect the RSSI of the target ONT in the first channel and obtain the RSSI detection result of the target ONT; the determination module 903 is used to determine whether the target ONT is an abnormal ONT based on the RSSI detection result of the target ONT.

[0123] In one possible implementation, the detection module 902 is used to detect the RSSI of the target ONT multiple times in the first channel within a first reference time period to obtain the RSSI detection result; the determination module 903 is used to determine the target ONT as an abnormal ONT when the RSSI detection result indicates that the number of detected RSSIs has reached a number threshold.

[0124] In one possible implementation, the detection module 902 is used to perform SD on the signal of the target ONT in the first channel to obtain the SD detection result of the signal of the target ONT. When the signal of the target ONT is detected, the SD detection result indicates a first level, and when the signal of the target ONT is not detected, the SD detection result indicates a second level. The determination module 903 is used to determine whether the target ONT is an abnormal ONT based on the SD detection result of the signal of the target ONT.

[0125] In one possible implementation, the detection module 902 is used to perform multiple signal detection (SD) tests on the signal of the target ONT in the first channel within a second reference time period to obtain multiple SD detection results; the determination module 903 is used to determine that the target ONT is an abnormal ONT when the number of SD detection results indicating the first level among the multiple SD detection results reaches a number threshold.

[0126] In one possible implementation, the authorization module 901 is further configured to authorize a second bandwidth to a second ONT other than the target ONT, the second bandwidth being less than a second bandwidth threshold, and the second bandwidth threshold being less than a first bandwidth threshold.

[0127] In one possible implementation, the authorization module 901 is further configured to sequentially authorize at least two third bandwidths to the target ONT, wherein the at least two third bandwidths are sequentially increased, and both of the at least two third bandwidths are greater than a second bandwidth threshold and less than a first bandwidth threshold, wherein the second bandwidth threshold is less than the first bandwidth threshold.

[0128] In one possible implementation, the first channel is a 50G PON channel with a first wavelength range of 1284–1288 nanometers.

[0129] In one possible implementation, the second channel is a 10G EPON and EPON channel, the second wavelength range is 1260–1280 nm, and the third wavelength range is 1290–1330 nm.

[0130] In one possible implementation, the detection device is an OLT.

[0131] It should be understood that the above Figure 9 The provided device, in implementing its functions, is only illustrated by the division of the above-described functional modules. In practical applications, the functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. Furthermore, the device and method embodiments provided in the above embodiments belong to the same concept, and their specific implementation processes are detailed in the method embodiments, and will not be repeated here.

[0132] It should be noted that, in other embodiments, each module can be used to execute any step in the optical network terminal detection method. That is, the steps implemented by the authorization module 901, detection module 902, and determination module 903 can be specified as needed. Different steps in the optical network terminal detection method are implemented by the authorization module 901, detection module 902, and determination module 903 respectively, thereby realizing all the functions of the detection device. Furthermore, the detection device provided in the above embodiments and the optical network terminal detection method embodiments belong to the same concept. For details of its specific implementation process and beneficial effects, please refer to the method embodiments, which will not be repeated here.

[0133] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state drive).

[0134] In this application, the terms "first," "second," etc., are used to distinguish identical or similar items with substantially the same function. It should be understood that there is no logical or temporal dependency between "first," "second," and "nth," nor does it limit the quantity or order of execution. It should also be understood that although the following description uses the terms "first," "second," etc., to describe various elements, these elements should not be limited by the terms. These terms are merely used to distinguish one element from another.

[0135] It should also be understood that, in the various embodiments of this application, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0136] In this application, the term "at least one" means one or more, and the term "multiple" means two or more. For example, multiple second devices means two or more second devices. The terms "system" and "network" are often used interchangeably herein.

[0137] It should be understood that the terminology used in the description of the various examples herein is for the purpose of describing particular examples only and is not intended to be limiting. As used in the description of the various examples and the appended claims, the singular forms “a” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0138] It should also be understood that the term "and / or" as used herein refers to and covers any and all possible combinations of one or more of the associated listed items. The term "and / or" describes an association between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects are in an "or" relationship.

[0139] It should also be understood that the terms “if” and “if” can be interpreted as meaning “when” or “upon”, or “in response to determination” or “in response to detection”. Similarly, depending on the context, the phrases “if determination…” or “if detection [the stated condition or event]” can be interpreted as meaning “when determination…”, or “in response to determination…”, or “when detection [the stated condition or event]” or “in response to detection [the stated condition or event]”.

[0140] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0141] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, in the form of program structure information. This program structure information includes one or more program instructions. When these program instructions are loaded and executed on a computing device, the processes or functions according to the embodiments of this application are generated, in whole or in part.

[0142] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware or by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as a read-only memory, a disk, or an optical disk.

[0143] It should be noted that all information (including but not limited to user device information, user personal information, etc.), data (including but not limited to data used for analysis, stored data, displayed data, etc.), and signals involved in this application have been authorized by the user or fully authorized by all parties, and the collection, use, and processing of related data must comply with the relevant laws, regulations, and standards of the relevant countries and regions. For example, the signals involved in this application were all obtained with full authorization.

[0144] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this application.

Claims

1. A method for detecting an optical network terminal, characterized in that, The method is applied to a detection device, which is connected to a first optical network terminal (ONT) via a first channel and to a second ONT via a second channel. The first channel receives wavelengths within a first wavelength range, and the second channel receives wavelengths within a second and a third wavelength range. The first wavelength range is located between the second and the third wavelength range. The method includes: Without granting bandwidth to the first ONT, a first bandwidth is granted to the target ONT, where the first bandwidth is greater than a first bandwidth threshold, and the target ONT is any one of the second ONTs; The signal of the target ONT is detected in the first channel to obtain the signal detection result; Based on the signal detection results, determine whether the target ONT is an abnormal ONT.

2. The method according to claim 1, characterized in that, The step of detecting the signal of the target ONT in the first channel to obtain the signal detection result includes: The Received Signal Strength Indication (RSSI) of the target ONT is detected in the first channel to obtain the RSSI detection result of the target ONT; The step of determining whether the target ONT is an abnormal ONT based on the signal detection result includes: Based on the RSSI detection results of the target ONT, determine whether the target ONT is an abnormal ONT.

3. The method according to claim 2, characterized in that, The step of detecting the Received Signal Strength Indication (RSSI) of the target ONT in the first channel to obtain the RSSI detection result of the target ONT includes: Within a first reference time period, the RSSI of the target ONT is detected multiple times in the first channel to obtain the RSSI detection result; The step of determining whether the target ONT is an abnormal ONT based on the RSSI detection result of the target ONT includes: If the RSSI detection result indicates that the number of detected RSSIs has reached a threshold, the target ONT is determined to be an abnormal ONT.

4. The method according to claim 1, characterized in that, The step of detecting the signal of the target ONT in the first channel to obtain the signal detection result includes: The signal detection SD of the target ONT is performed on the first channel to obtain the SD detection result of the target ONT signal. When the signal of the target ONT is detected, the SD detection result indicates a first level. When the signal of the target ONT is not detected, the SD detection result indicates a second level. The step of determining whether the target ONT is an abnormal ONT based on the signal detection result includes: Based on the SD detection results of the target ONT's signal, determine whether the target ONT is an abnormal ONT.

5. The method according to claim 4, characterized in that, The signal detection SD of the target ONT is performed on the signal in the first channel to obtain the SD detection result of the target ONT signal, including: Within the second reference duration, the signal detection SD of the target ONT is performed multiple times on the first channel to obtain multiple SD detection results; The step of determining whether the target ONT is an abnormal ONT based on the SD detection result of the target ONT's signal includes: If the number of SD detection results indicating the first level among the plurality of SD detection results reaches a number threshold, the target ONT is determined to be an abnormal ONT.

6. The method according to any one of claims 1-5, characterized in that, The method further includes: A second bandwidth is granted to a second ONT other than the target ONT, the second bandwidth being less than a second bandwidth threshold, and the second bandwidth threshold being less than the first bandwidth threshold.

7. The method according to any one of claims 1-6, characterized in that, The method further includes: At least two third bandwidths are granted sequentially to the target ONT, the at least two third bandwidths increasing sequentially, the at least two third bandwidths being greater than a second bandwidth threshold and less than a first bandwidth threshold, the second bandwidth threshold being less than the first bandwidth threshold.

8. The method according to any one of claims 1-7, characterized in that, The first channel is a 50G passive optical network (PON) channel, and the first wavelength range is 1284–1288 nanometers.

9. The method according to any one of claims 1-8, characterized in that, The second channel is a 10 Gigabit Ethernet Passive Optical Network (10GEPON) and EPON channel, the second wavelength range is 1260–1280 nm, and the third wavelength range is 1290–1330 nm.

10. The method according to any one of claims 1-9, characterized in that, The detection device is an optical line terminal (OLT).

11. A detection device, characterized in that, The detection device is connected to a first optical network terminal (ONT) via a first channel and to a second ONT via a second channel. The first channel receives wavelengths within a first wavelength range, and the second channel receives wavelengths within a second and a third wavelength range. The first wavelength range is located between the second and the third wavelength range. The detection device includes: The authorization module is used to authorize a first bandwidth to a target ONT without authorizing the first ONT, wherein the first bandwidth is greater than a first bandwidth threshold, and the target ONT is any one of the second ONTs; The detection module is used to detect the signal of the target ONT in the first channel and obtain the signal detection result; The determination module is used to determine whether the target ONT is an abnormal ONT based on the signal detection result.

12. The apparatus according to claim 11, characterized in that, The detection module is used to detect the Received Signal Strength Indication (RSSI) of the target ONT in the first channel, and obtain the RSSI detection result of the target ONT; The determining module is used to determine whether the target ONT is an abnormal ONT based on the RSSI detection result of the target ONT.

13. The apparatus according to claim 12, characterized in that, The detection module is used to detect the RSSI of the target ONT multiple times in the first channel within a first reference time period, and obtain the RSSI detection result. The determining module is used to determine that the target ONT is an abnormal ONT when the RSSI detection result indicates that the number of detected RSSIs has reached a quantity threshold.

14. The apparatus according to claim 11, characterized in that, The detection module is used to perform signal detection SD on the signal of the target ONT in the first channel to obtain the SD detection result of the signal of the target ONT. When the signal of the target ONT is detected, the SD detection result indicates a first level, and when the signal of the target ONT is not detected, the SD detection result indicates a second level. The determining module is used to determine whether the target ONT is an abnormal ONT based on the SD detection result of the target ONT's signal.

15. The apparatus according to claim 14, characterized in that, The detection module is used to perform multiple signal detection (SD) tests on the signal of the target ONT in the first channel within a second reference time period to obtain multiple SD detection results. The determining module is used to determine that the target ONT is an abnormal ONT when the number of SD detection results indicating a first level among the plurality of SD detection results reaches a number threshold.

16. The apparatus according to any one of claims 11-15, characterized in that, The authorization module is further configured to authorize a second bandwidth to a second ONT other than the target ONT, wherein the second bandwidth is less than a second bandwidth threshold and the second bandwidth threshold is less than the first bandwidth threshold.

17. The apparatus according to any one of claims 11-16, characterized in that, The authorization module is further configured to authorize at least two third bandwidths to the target ONT in sequence, wherein the at least two third bandwidths are sequentially increased, and both of the at least two third bandwidths are greater than a second bandwidth threshold and less than a first bandwidth threshold, wherein the second bandwidth threshold is less than the first bandwidth threshold.

18. The apparatus according to any one of claims 11-17, characterized in that, The first channel is a 50G passive optical network (PON) channel, and the first wavelength range is 1284–1288 nanometers.

19. The apparatus according to any one of claims 11-18, characterized in that, The second channel is a 10 Gigabit Ethernet Passive Optical Network (10GEPON) and EPON channel, the second wavelength range is 1260–1280 nm, and the third wavelength range is 1290–1330 nm.

20. The apparatus according to any one of claims 11-19, characterized in that, The detection device is an optical line terminal (OLT).

21. An optical line terminal, characterized in that, The optical line terminal (OLT) includes a passive optical network (PON) media access control (MAC) chip and a PON optical module. The PON optical module is connected to a first ONT through a first channel and to a second ONT through a second channel. The wavelength range received by the first channel is a first wavelength range, and the wavelength range received by the second channel is a second wavelength range and a third wavelength range. The first wavelength range is located between the second wavelength range and the third wavelength range. The PON MAC chip is used to authorize a first bandwidth to a target ONT without authorizing the first ONT; The PON optical module is used to detect the signal of the target ONT in the first channel and obtain the signal detection result; The PON MAC chip is also used to acquire the signal detection result and determine whether the target ONT is an abnormal ONT based on the signal detection result.

22. The optical line terminal according to claim 21, characterized in that, The PON optical module is used to detect the Received Signal Strength Indication (RSSI) of the target ONT in the first channel, and obtain the RSSI detection result of the target ONT. The PON MAC chip is used to determine whether the target ONT is an abnormal ONT based on the RSSI detection result of the target ONT.

23. The optical line terminal according to claim 22, characterized in that, The PON optical module is used to detect the RSSI of the target ONT multiple times in the first channel within a first reference time period to obtain the RSSI detection result. The PON MAC chip is used to determine that the target ONT is an abnormal ONT when the RSSI detection result indicates that the number of detected RSSIs has reached a threshold.

24. The optical line terminal according to claim 21, characterized in that, The PON optical module is used to perform signal detection (SD) on the signal of the target ONT in the first channel to obtain the SD detection result of the signal of the target ONT. When the signal of the target ONT is detected, the SD detection result indicates a first level; when the signal of the target ONT is not detected, the SD detection result indicates a second level. The PON MAC chip is used to determine whether the target ONT is an abnormal ONT based on the SD detection result of the target ONT's signal.

25. The optical line terminal according to claim 24, characterized in that, The PON optical module is used to perform multiple signal detection (SD) tests on the signal of the target ONT in the first channel within a second reference time period to obtain multiple SD detection results. The PON MAC chip is used to determine that the target ONT is an abnormal ONT when the number of SD detection results indicating a first level among the multiple SD detection results reaches a number threshold.

26. The optical line terminal according to any one of claims 21-25, characterized in that, The PON MAC chip is also used to authorize a second bandwidth to a second ONT other than the target ONT, the second bandwidth being less than a second bandwidth threshold, and the second bandwidth threshold being less than the first bandwidth threshold.

27. The optical line terminal according to any one of claims 21-26, characterized in that, The PON MAC chip is also used to authorize at least two third bandwidths to the target ONT in sequence, wherein the at least two third bandwidths increase sequentially, and both of the at least two third bandwidths are greater than a second bandwidth threshold and less than a first bandwidth threshold, wherein the second bandwidth threshold is less than the first bandwidth threshold.

28. The optical line terminal according to any one of claims 21-27, characterized in that, The first channel is a 50G passive optical network (PON) channel, and the first wavelength range is 1284–1288 nanometers.

29. The optical line terminal according to any one of claims 21-28, characterized in that, The second channel is a 10 Gigabit Ethernet Passive Optical Network 10G EPON and EPON channel, the second wavelength range is 1260-1280 nm, and the third wavelength range is 1290-1330 nm.

30. A passive optical network system, characterized in that, The passive optical network (PON) system includes an optical line terminal (OLT), a first ONT, and a second ONT. The OLT is connected to the first ONT through a first channel, and the OLT is connected to the second ONT through a second channel. The wavelength range received by the first channel is a first wavelength range, and the wavelength range received by the second channel is a second wavelength range and a third wavelength range. The first wavelength range is located between the second wavelength range and the third wavelength range. The OLT is used to perform the detection method for optical network terminals according to any one of claims 1-10.

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