CN117376742A

CN117376742A - Backbone light path protection method and system, electronic device and computer readable medium

Info

Publication number: CN117376742A
Application number: CN202210777487.9A
Authority: CN
Inventors: 余辰东
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2024-01-09
Also published as: WO2024001774A1

Abstract

The application provides a trunk light path protection method and system, electronic equipment and a computer readable medium, wherein the trunk light path protection method comprises the following steps: when at least one source PON port in the source PON port clusters detects a first alarm and the first alarm judges that the switching condition is met, determining a target PON port group corresponding to the source PON port clusters according to a first corresponding relation between the preset source PON port clusters and the target PON port groups; switching an optical network unit under a source PON port in the source PON port cluster to one target PON port in a target PON port group; wherein, the number of source PON ports included in the source PON port cluster is greater than or equal to 2, and the target PON port group includes: 1 target PON port or 2 target PON ports which are in primary and standby relation.

Description

Backbone light path protection method and system, electronic device and computer readable medium

Technical Field

The embodiment of the application relates to the technical field of communication, in particular to a trunk optical path protection method and system, electronic equipment and a computer readable medium.

Background

In xPON of a passive optical network (PON, passive Optical Network), a common networking system is shown in fig. 1, and the system is composed of a network management server 101, an optical line terminal (OLT, optical Line Terminal) 102, an optical distribution network (ODN, optical Distribution Network) 103, and a plurality of optical network units (ONU, optical Network Unit) 104. The OLT102 serves as central office equipment and is connected to a plurality of ONUs 104 by using the PON port as a unit through the ODN 103, and the ONUs 104 implement access to user services, thereby implementing functions such as data service and configuration management.

In a conventional PON, access of a plurality of ONUs 104 is implemented by using PON ports as a unit, so as to implement a point-to-multipoint (P2 MP, point To Multiply Point) topology, where a point refers to a PON port of the OLT102, and a multipoint refers to a plurality of ONUs 104 connected under the PON port. In this P2MP topology, in the ODN 103 connected between the PON port of the OLT102 and the ONU104, aggregation of the connection between the multiple ONUs 104 is generally achieved by using optical splitters, the optical splitters in the network generally achieve multi-stage optical splitting in a cascade manner, the optical splitter directly connected to the PON port of the OLT102 is referred to as a first-stage optical splitter, the optical splitter connected to the first-stage optical splitter is referred to as a second-stage optical splitter, and so on. The optical link connecting the PON port of the OLT102 and the primary splitter is referred to as a trunk optical path or a trunk optical fiber (hereinafter, the trunk optical path and the trunk optical fiber are identical), and the other optical link is referred to as a branch optical path or a branch optical fiber (hereinafter, the branch optical path and the branch optical fiber are identical).

As can be seen from the above networking, if the trunk optical path is interrupted, all the ONUs 104 under the trunk optical path will be interrupted, so that protection of the trunk optical path is necessary, and the original primary beam splitter is set from 1: n is changed to 2: n, where 1 and 2 refer to the number of main fibers of the optical splitter, that is, the main optical path becomes 2 paths, the 2 paths of main optical paths are in a main-standby working mode, the ONU104 is connected to the PON port corresponding to the OLT102 through the main optical path, the PON port in a working state is called a main PON port, and the main optical path connected to the main PON port is called a main optical path.

Disclosure of Invention

The embodiment of the application provides a trunk light path protection method and system, electronic equipment and a computer readable medium.

In a first aspect, an embodiment of the present application provides a method for protecting a backbone optical path, including: when at least one source PON port in the source PON port clusters detects a first alarm and the first alarm judges that the switching condition is met, determining a target PON port group corresponding to the source PON port clusters according to a first corresponding relation between the preset source PON port clusters and the target PON port groups; switching an optical network unit under a source PON port in the source PON port cluster to one target PON port in the target PON port group; wherein, the number of source PON ports included in the source PON port cluster is greater than or equal to 2, and the target PON port group includes: 1 target PON port or 2 target PON ports which are in primary and standby relation.

In a second aspect, an embodiment of the present application provides an electronic device, including: at least one processor; and the memory is stored with at least one program, and when the at least one program is executed by the at least one processor, the trunk optical path protection method is realized.

In a third aspect, embodiments of the present application provide a computer readable medium having a computer program stored thereon, where the computer program when executed by a processor implements any one of the above-mentioned backbone optical path protection methods.

In a fourth aspect, embodiments of the present application provide a backbone optical path protection system, including: an optical line terminal and a trunk splitter; the optical line terminal is configured to determine, when at least one source PON port in a source PON port cluster detects a first alarm and it is determined that a switching condition is met according to the first alarm, a target PON port group corresponding to the source PON port cluster according to a first correspondence between a preset source PON port cluster and a target PON port group; switching an optical network unit under a source PON port in the source PON port cluster to one target PON port in a target PON port group; wherein, the number of source PON ports included in the source PON port cluster is greater than or equal to 2, and the target PON port group includes: 1 target PON port or 2 target PON ports which are in primary and standby relation.

According to the trunk optical path protection method provided by the embodiment of the application, when the source PON port detects the first alarm and judges that the switching condition is met according to the first alarm, the optical network units under the source PON port in the source PON port cluster are switched to one target PON port in the target PON port group; because the number of the source PON ports included in the source PON port cluster is greater than or equal to 2, namely, the purpose of switching two or more source PON ports to one target PON port is realized, and the resource utilization rate of the PON ports is improved on the premise of ensuring that all backbone light paths are protected.

Drawings

FIG. 1 is a schematic diagram of a networking system in the related art;

fig. 2 is a schematic architecture diagram of a trunk optical path protection system according to an embodiment of the present application;

fig. 3 is a flowchart of a method for protecting a backbone optical path according to an embodiment of the present application.

Detailed Description

In order to better understand the technical solutions of the present application, the following describes in detail the method and system for protecting the backbone optical path, the electronic device and the computer readable medium provided by the present application with reference to the accompanying drawings.

Example embodiments will be described more fully hereinafter with reference to the accompanying drawings, but may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

In the absence of conflict, embodiments and features of embodiments herein may be combined with one another.

As used herein, the term "and/or" includes any and all combinations of at least one of the associated listed items.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of at least one other feature, integer, step, operation, element, component, and/or group thereof.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and this application and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

When the main trunk optical path is abnormal, the OLT 102 controls the service to switch to the standby trunk optical path, the ONU 104 is connected to the PON port corresponding to the OLT 102 through the standby trunk optical path, the PON port is called a standby PON port, and the protection mechanism is called trunk optical fiber protection (i.e., TYPEB protection). The TYPEB protection mechanism can realize the protection of ONU business under the PON port, but can bring two problems: 1) Because the main optical paths and the standby main optical paths are respectively connected with the main PON ports, the PON port resource utilization rate of the OLT is reduced to 50% at most, and therefore the problems that the data transmission rate or throughput is difficult to improve and more ONUs cannot be accessed under the condition that the number of the existing PON ports is not increased are possibly caused; 2) Since the TYPEB protection mechanism needs to adopt two backbone light paths, and in practice, the optical fiber resources of the operators are limited, it may not be guaranteed that all backbone light paths adopt such a protection manner, that is, a part of backbone light paths cannot be protected, and if all backbone light paths are required to be protected, the layout cost will be very high.

The embodiment of the application improves the architecture of a trunk optical path protection system implemented by adopting a TYPEB protection mechanism in the related art, as shown in fig. 2, the trunk optical path protection system of the embodiment of the application includes: OLT201 and backbone splitter 202. A network management server (not shown in fig. 2), ODN203, and ONUs (not shown in fig. 2) may also be included.

The network management server performs configuration, management or maintenance on the OLT201 and the ONU to which the OLT belongs; and manages history information of OLT201, ONUs, and related alarm and notification messages. And according to the alarm or notification message related to PON protection switching reported by OLT201, dynamic maintenance and reminding of human intervention on the related network can be implemented.

OLT201 performs registration and maintenance of ONUs based on the PON interface.

ODN203, configured to connect ONUs with different numbers under OLT201, as a direct physical connection channel between OLT201 and the ONUs, may be formed by combining a plurality of physical devices, including but not limited to:

and the main optical path (main and standby) is used for connecting the first-level optical splitter and the PON ports corresponding to the OLT, and a single PON port is generally adopted, and when a protection mode is adopted, the main and standby PON ports are started.

The optical splitters (one stage or multiple stages) are generally configured according to ODN network planning and networking, one or more optical splitters are combined together to realize an optical splitting ratio, and the general maximum optical splitting ratio is 1:128 or 1:256, the optical splitter cascade typically does not exceed three stages, since the optical splitter introduces optical attenuation. The optical splitters directly connected with the PON port of the OLT are first-stage optical splitters, and other cascade optical splitters are respectively called second-stage optical splitters or third-stage optical splitters (n-stage optical splitters for short).

The branch optical fiber is called as a light path connecting the multi-stage optical splitters and a light path directly connected with the ONU.

The ONU is used for accessing the terminal equipment of the home subscriber, receiving the management of the OLT201, and receiving the link identifier distributed by the OLT201 in the registration process to finish ONU registration; and the service forwarding is completed by uniformly distributing the uploading data in the time slot window according to the OLT 201.

The trunk beam splitter 202 is configured to implement convergence of two or more standby trunk optical paths, and the convergence function of the trunk beam splitter 202 is the same as that of an ONU.

In some exemplary embodiments, the trunk beam splitter 202 is 1: the N optical splitters are used for realizing the convergence of N standby trunk optical paths, namely, the protection of N source PON ports.

In some exemplary embodiments, the trunk beam splitter 202 is 2: the N optical splitters are used for realizing the convergence of N standby trunk optical paths, namely, the protection of N source PON ports. The two main light paths of the main beam splitter 202 are in a main-standby relationship, only one main light path is in a working state at the same time, and the other main light path realizes the protection of the main light path in the working state.

In the embodiment of the present application, the number of the trunk splitters 202 may be one, or may be two or more, and may be set according to actual needs. Each trunk splitter 202 corresponds to one source PON port cluster.

The implementation process of the trunk optical path protection method in the OLT is described below based on the architecture of the trunk optical path protection system of the present application.

In a first aspect, referring to fig. 3, an embodiment of the present application provides a trunk optical path protection method, where the method may be applied to an OLT, and the method includes:

step 300, when at least one source PON port in the source PON port cluster detects the first alarm and the switching condition is determined to be satisfied according to the first alarm, determining a target PON port group corresponding to the source PON port cluster according to a first correspondence between a preset source PON port cluster and the target PON port group.

In this embodiment, the source PON port cluster includes a PON port where a spare trunk optical path is connected to a trunk splitter, which is referred to herein as a source PON port. For example, in fig. 2, since the spare trunk optical paths of PON port 1 (i.e., PON1 in fig. 2) and PON port 3 (i.e., PON3 in fig. 2) are both connected to the trunk optical splitter, the source PON port cluster comprises PON port 1 and PON port 3.

In the embodiment of the present application, when the OLT detects that the first alarm occurs on the backbone optical path, that is, when the PON port detects the first alarm, there is a possibility that the backbone optical path is abnormal. Wherein, when no valid upstream signal is detected for 4 consecutive frames of the corresponding PON port, it is considered that the first alarm is detected at the corresponding PON port.

In some example embodiments, the first alarm may be a PON LOS alarm.

In addition to the first alarm being detected at the PON port, a third alarm and a second alarm may be detected. The third alarm refers to off-line alarm of a single ONU, and is detected when effective uplink signals of the single ONU are not detected in 4 continuous frames; the second alarm refers to a power-down alarm of a single ONU, and the second alarm is reported through discharging a capacitor when the ONU is powered off.

In some example embodiments, the second alarm may be an ONUDGi alarm and the third alarm may be an ONU LOSi alarm.

Several service scenarios in which the first alert is detected are listed below.

(1) And if the trunk optical path is faulty, i.e. all ONUs under the PON port are offline, the PON port detects the first alarm.

(2) If the cell is powered down, that is, all ONUs under the PON port are powered down, typically, if the PON port is powered down in a centralized area, the PON port will detect the first alarm, but this situation is irrelevant to the failure of the backbone optical path.

(3) When the last ONU under the PON port is powered off, the second alarm reported by the last ONU can be detected, and under the condition, the first alarm can be detected by the PON port, but the condition is irrelevant to the main light path fault.

(4) When the last ONU under the PON port is offline, a third alarm is detected, in which case the PON port detects a first alarm, which may be related to a trunk optical path failure.

(5) Only one ONU is powered down under the PON port, which comprises two scenes, wherein only one ONU is configured under the PON port, and the ONU is powered down and can detect a second alarm; a plurality of ONUs are configured below the PON port, but only one ONU is in line, and the ONU is powered down and can detect a second alarm; the first alarm is detected by the corresponding PON port in both cases, but this case is not related to a backbone optical path failure.

(6) Only one ONU is offline under the PON port, which comprises two scenes, wherein the PON port is configured with only one ONU, and the ONU is offline and can detect a third alarm; a plurality of ONUs are configured below the PON port, only one ONU is on-line, and the ONU is off-line, so that a third alarm can be detected; the first alarm is detected by the corresponding PON port in both cases, which may be related to a trunk optical path failure.

(7) All ONUs are not on-line, in which case the PON port would detect the first alarm, but this is not related to a backbone optical path failure.

For the above seven service scenarios, the service scenario (1), the service scenario (4) and the service scenario (6) are considered to have the possibility of meeting the switching condition, so when judging whether the switching condition is met according to the first alarm, whether the first alarm belongs to the service scenario (1), the service scenario (4) and the service scenario (6) needs to be judged.

In some exemplary embodiments, for the service scenario (1) and the service scenario (2), the following manner may be adopted to determine whether the switching condition is satisfied according to the first alarm: judging whether a first switching condition is met; the first switching condition includes: judging whether the number of the offline optical network units under the PON port in a first preset time period before the first alarm is detected is larger than or equal to a first preset threshold value, and judging whether the second alarm is detected in a second preset time period before the first alarm is detected.

In some exemplary embodiments, for the service scenario (3), the following manner may be adopted to determine whether the switching condition is satisfied according to the first alarm: judging whether the switching condition is met according to whether only one optical network unit under the endogenous PON port is powered down in a third preset time period before the first alarm is detected.

In some exemplary embodiments, for the service scenario (4), the following manner may be adopted to determine whether the switching condition is satisfied according to the first alarm: judging whether the switching condition is met or not according to whether the second switching condition is met or not, the number of source PON ports meeting the first preset condition in the source PON port cluster or the proportion occupied by the number of source PON ports meeting the first preset condition in the source PON port cluster, and the number of source PON ports meeting the second preset condition in the source PON port cluster or the proportion occupied by the number of source PON ports meeting the second preset condition; wherein the second switching condition includes: only one optical network unit is offline below the source PON port in a third preset time period before the first alarm is detected, and no second alarm is detected in a second preset time period before the first alarm is detected. For example, whether the second switching condition is satisfied, whether the number of source PON ports satisfying the first preset condition or the proportion of the number of source PON ports satisfying the first preset condition in the source PON port cluster is greater than or equal to a second preset threshold, and whether the number of source PON ports satisfying the second preset condition or the proportion of the number of source PON ports satisfying the second preset condition in the source PON port cluster is greater than or equal to a third preset threshold are determined.

In some exemplary embodiments, for the service scenario (5) and the service scenario (6), the following manner may be adopted to determine whether the switching condition is satisfied according to the first alarm: judging whether the switching condition is met or not according to whether the second switching condition is met or not and the quantity of source PON ports meeting the second preset condition or the proportion of the quantity of the source PON ports meeting the second preset condition in the source PON port cluster. For example, whether the second switching condition is satisfied or not is determined, and whether the number of source PON ports satisfying the second preset condition or the proportion of the number of source PON ports satisfying the second preset condition in the source PON port cluster is greater than or equal to a third preset threshold is determined.

In some exemplary embodiments, the first preset condition includes: only one optical network unit is offline under the source PON port in a third preset time before the source PON port detects the first alarm for the last time, and no second alarm is detected in a second preset time period before the source PON port detects the first alarm for the last time; the second preset condition includes: the first alarm recovery time is greater than or equal to an average offline-to-online recovery time of the optical network unit under the source PON port.

In some exemplary embodiments, the first alert recovery time refers to a time interval between a time when the first alert was last detected and a time when the last detected first alert was removed.

In some exemplary embodiments, in particular, when determining whether the first switching condition, the second switching condition, or the third switching condition is met according to the first alarm, the determination may be performed according to assignment of a register corresponding to the source PON port in advance. Each time a first alarm is detected at the source PON port, a reassignment needs to be performed to a register corresponding to the source PON port. The register corresponding to the source PON port is assigned in the following manner:

aiming at the service scene (1), if the number of the offline optical network units under the source PON port in the first preset time period is larger than or equal to a first preset threshold value and if the second alarm is not detected in the second preset time period, assigning a register corresponding to the source PON port as true;

aiming at a service scene (2), if the number of the offline optical network units under the source PON port in a first preset time period is larger than or equal to a first preset threshold value and a second alarm is detected in a second preset time period, assigning a register corresponding to the source PON port as false;

for the service scenario (3), when judging that the switching condition is not satisfied according to the first alarm includes: if only one optical network unit under the source PON port in the third preset time period is powered down, assigning a register corresponding to the source PON port as false;

Aiming at a service scene (4), if only one optical network unit under the source PON port in a third preset time period is offline and if no second alarm is detected in the second preset time period, assigning a register corresponding to the source PON port as a first preset character; wherein the first preset character is other characters except true and false;

aiming at a service scene (5), only one optical network unit is configured under the source PON port, only one optical network unit is offline under the source PON port in a third preset time period, and a register corresponding to the source PON port is assigned as false under the condition that the second alarm is detected in a second preset time period;

aiming at a service scene (6), only one optical network unit is configured under the source PON port, and when only one optical network unit under the source PON port in a third preset time period is offline and no second alarm is detected in a second preset time period, a register corresponding to the source PON port is assigned to be a second preset character; wherein the second preset character is other characters except true and false;

and (3) for the service scene (7), assigning a register corresponding to the source PON port as false.

In some exemplary embodiments, the average offline-to-online recovery time of the optical network units under the source PON port is an average value of offline-to-online recovery times of all the optical network units under the source PON port, and the statistical time window may be set at will, or may be continuously counted after the ONU is online.

In some exemplary embodiments, when determining whether the number of source PON ports in the source PON port cluster that satisfies the first preset condition or the proportion of the number of source PON ports that satisfies the first preset condition is greater than or equal to the second preset threshold, it may be determined whether the number of source PON ports in the source PON port cluster that corresponds to the register assigned to the first preset character or the proportion of the number of source PON ports in the corresponding register assigned to the first preset character is greater than or equal to the second preset threshold.

In some exemplary embodiments, in the case that it is determined that the switching condition is not satisfied according to the first alarm, the switching operation is not performed.

In some exemplary embodiments, for the service scenario (1), determining that the switching condition is satisfied according to the first alarm includes: and judging that the first switching condition is met. Specifically, it is determined that the number of offline optical network units under the PON port in the first preset period is greater than or equal to a first preset threshold, and it is determined that no second alarm is detected in the second preset period.

That is, when the value of the register corresponding to the source PON port is true, it is determined that the switching condition is satisfied.

In some exemplary embodiments, for the service scenario (2), determining that the switching condition is not satisfied according to the first alarm includes: judging that the number of offline optical network units under the PON port in the first preset time period is smaller than a first preset threshold value, or judging that a second alarm is detected in the second preset time period.

That is, when the value of the register corresponding to the source PON port is false, it is determined that the switching condition is not satisfied.

Aiming at the service scene (3), judging that the switching condition is not met according to the first alarm comprises the following steps: only one optical network unit under the endogenous PON port is powered down in a third preset time period before the first alarm is detected.

In some exemplary embodiments, for the service scenario (4), determining that the switching condition is satisfied according to the first alarm includes: judging that the first alarm meets the second switching condition, wherein the number of source PON ports meeting the first preset condition or the proportion of the number of source PON ports meeting the first preset condition in the source PON port cluster is larger than or equal to a second preset threshold, or the number of source PON ports meeting the second preset condition in the source PON port cluster or the proportion of the number of source PON ports meeting the second preset condition is larger than or equal to a third preset threshold. Specifically, it is determined that only one optical network unit under the source PON port is offline in a third preset period of time, and it is determined that no second alarm is detected in the second preset period of time; and the number of source PON ports satisfying the first preset condition in the source PON port cluster or the proportion occupied by the number of source PON ports satisfying the first preset condition is greater than or equal to a second preset threshold, or the number of source PON ports satisfying the second preset condition in the source PON port cluster or the proportion occupied by the number of source PON ports satisfying the second preset condition is greater than or equal to a third preset threshold.

That is, when the value of the register corresponding to the source PON port is a first preset character, and the number of source PON ports satisfying the first preset condition or the proportion occupied by the number of source PON ports satisfying the first preset condition in the source PON port cluster is greater than or equal to a second preset threshold, and the number of source PON ports satisfying the second preset condition or the proportion occupied by the number of source PON ports satisfying the second preset condition in the source PON port cluster is greater than or equal to a third preset threshold, it is determined that the switching condition is satisfied.

In some exemplary embodiments, in a case that the number of source PON ports satisfying the second preset condition or the proportion of the number of source PON ports satisfying the second preset condition in the source PON port cluster is smaller than a third preset threshold, the switching operation is not performed.

In some exemplary embodiments, for the service scenario (6), determining that the switching condition is met according to the first alert includes: and judging that the first alarm meets a second switching condition, wherein the number of source PON ports meeting a second preset condition or the proportion of the number of source PON ports meeting the second preset condition in the source PON port cluster is larger than or equal to a third preset threshold. Specifically, it is determined that only one optical network unit is configured under the source PON port, it is determined that only one optical network unit under the source PON port is offline in a third preset period of time, it is determined that no second alarm is detected in a second preset period of time, and the number of source PON ports in the source PON port cluster that satisfy the second preset condition or the proportion of the number of source PON ports that satisfy the second preset condition is greater than or equal to a third preset threshold.

That is, when the value of the register corresponding to the source PON port is a second preset character, and the number of source PON ports satisfying the second preset condition or the ratio of the number of source PON ports satisfying the second preset condition in the source PON port cluster is greater than or equal to a third preset threshold, it is determined that the switching condition is satisfied.

In some exemplary embodiments, for the service scenario (5), determining that the switching condition is not satisfied according to the first alarm includes: only one optical network unit is configured under the source PON port, only one optical network unit is offline under the source PON port in a third preset time period, and a second alarm is detected in a second preset time period.

That is, when the value of the register corresponding to the source PON port is false, it is determined that the switching condition is satisfied.

Step 301, switching an optical network unit under a source PON port in a source PON port cluster to a target PON port in a target PON port group; wherein, the quantity of source PON mouths that includes in the source PON mouthful cluster is greater than or equal to 2, and the target PON mouthful group includes: 1 target PON port or 2 target PON ports which are in primary and standby relation.

In the embodiment of the present application, the trunk beam splitter 202 is 1: in the case of an N splitter, the number of target PON ports in the target PON group is 1; the trunk beam splitter 202 is 2: in the case of an N-splitter, the number of target PON ports in the target PON group is 2, and two target PON ports are in a master-slave relationship.

In some exemplary embodiments, switching an optical network unit under a source PON port in a source PON port cluster to one target PON port in a target PON port group comprises: and switching the optical network units under the source PON ports in the source PON port cluster to the target PON ports with highest priority and available priority in the target PON port group according to the priority of the target PON ports in the target PON port group.

In some exemplary embodiments, in the case where priorities of all the target PON ports in the target PON port group are the same, the target PON port of which priority is switched is designated according to static operation data of the target PON port in the target PON port group. For example, in a case where the number of target PON ports in the target PON port group is 2 and 2 target PON ports are in a master-slave relationship, the priority of the master target PON port may be set higher than the priority of the slave target PON port. When the switching operation is executed, the optical network units under the source PON ports in the source PON port cluster are preferentially switched to the main target PON ports, and when the main target PON ports are abnormal before the optical network units under the source PON ports in the source PON port cluster are switched to the main target PON ports, the optical network units under the source PON ports in the source PON port cluster are switched to the standby target PON ports; when there is abnormality in the main target PON port after switching the optical network units under the source PON port in the source PON port cluster to the main target PON port, switching the optical network units under the main target PON port to the standby target PON port.

In some exemplary embodiments, the priority of the target PON port in the target PON port group may be manually specified or determined according to dynamic working data of a hardware module or a logic module where the target PON port is located. Wherein dynamic working data such as alarms, traffic, etc.

In some exemplary embodiments, the priority of the target PON ports in the target PON port group may be determined according to static working data of the target PON ports in the target PON port group.

In some exemplary embodiments, static working data such as port type, port location index, etc.

In some exemplary embodiments, switching an optical network unit under a source PON port in a source PON port cluster to one target PON port in a target PON port group comprises: and switching part or all of the optical network units under part or all of the source PON ports in the source PON port cluster to one target PON port in the target PON port group.

In some exemplary embodiments, switching an optical network unit under a source PON port in a source PON port cluster to a target PON port in a target PON port cluster comprises: and migrating the static configuration data of the optical network unit to the target PON port.

In some exemplary embodiments, the dynamic configuration data of the optical network unit may be dynamically generated on the target PON port when performing the switching operation.

In some exemplary embodiments, migrating static configuration data of the optical network unit to the target PON port comprises: under the condition that the resource ratio of the target PON port to the source PON port cluster is greater than or equal to 1, the lossless switching of the service can be realized, and the static configuration data of all online ONUs under all source PON ports in the source PON port cluster are migrated to the target PON port; wherein the resource ratio is according to the formulaCalculating to obtain; wherein the RAT is _r For the resource ratio, R _so R is the average online resource number of source PON port clusters _da N is the maximum available resource number of the target PON port _p N is the number of source PON ports in the source PON port cluster _e The number of source PON ports is the number of source PON port failures in the backbone optical path that can be tolerated in the source PON port cluster.

In some exemplary embodiments, the maximum available resource number of the target PON port may refer to a maximum ONU number configurable by the target PON port, a maximum bandwidth configurable by the target PON port, or the like.

In some exemplary embodiments, the average online resource number of the source PON port cluster may refer to an average online number of ONUs in the source PON port cluster, or an average traffic hub ratio of ONUs in the source PON port cluster, that is, a ratio of the number of simultaneous traffic and the total number of loadable traffic in a unit time.

In some exemplary embodiments, migrating the static configuration data of the optical network unit to the target PON port further comprises:

when the resource ratio of the target PON port to the source PON port cluster is less than 1, the lossless switching of the service cannot be achieved, and then the lossy switching of the service can be achieved, preferentially migrating the registration data in the static configuration data of the optical network unit having a priority higher than or equal to the first priority threshold among the optical network units satisfying the third preset condition to the target PON port according to the priority of the optical network unit under the source PON port in the source PON port cluster, and secondarily migrating the registration data in the static configuration data of the optical network unit having a priority higher than or equal to the second priority threshold among the optical network unit satisfying the third preset condition to the target PON port according to the priority of the source PON port in the source PON port cluster; the number of the optical network units for transferring the registration data to the target PON port is smaller than or equal to the number of the optical network units configurable by the target PON port;

or under the condition that the resource ratio of the target PON port to the source PON port cluster is smaller than 1, preferentially migrating the registration data and the service data in the static configuration data of the optical network units which meet the third preset condition in the optical network units which meet the third preset condition and are higher than or equal to the first priority threshold to the target PON port according to the priority of the optical network units which meet the third preset condition in the source PON port cluster, and secondly migrating the registration data and the service data in the static configuration data of the optical network units which meet the third preset condition in the source PON port which are higher than or equal to the second priority threshold to the target PON port according to the priority of the source PON port in the source PON port cluster; the sum of the bandwidths occupied by the optical network units for transferring the registration data and the service data to the target PON port is smaller than or equal to the bandwidth configured by the target PON port.

In some exemplary embodiments, the traffic data comprises bandwidth data, which may comprise bandwidth occupied by the optical network unit.

In some exemplary embodiments, other possible mixing rules may also be employed to migrate the static configuration data of the optical network unit to the target PON port. For example, according to the priority of the optical network units under the source PON in the source PON cluster, preferentially migrating the registration data and the service data in the static configuration data of the optical network units with the priority higher than or equal to the first priority threshold among the optical network units meeting the third preset condition to the target PON, and then according to the priority of the source PON in the source PON cluster, migrating the registration data in the static configuration data of the optical network units with the priority higher than or equal to the second priority threshold among the optical network units meeting the third preset condition to the target PON. As another example, static configuration data of the high-priority optical network unit is preferentially migrated to the target PON port, whether or not the optical network unit is online.

In some exemplary embodiments, in the case that the resource ratio of the target PON port to the source PON port cluster is less than 1, if the maximum bandwidth of the target PON port is less than the total bandwidth requirement of the ONUs for static configuration data to migrate to the target PON port, the bandwidth of the ONUs for static configuration data to migrate to the target PON port may be reduced; or, the bandwidth is allocated to the ONU with high priority preferentially, and other ONUs allocate the bandwidth in a sharing mode.

In some exemplary embodiments, reducing the bandwidth of the ONU with static configuration data migrated to the target PON port comprises:

when the priorities of the ONUs for migrating the static configuration data to the target PON port are the same, reducing the bandwidth data in the static configuration data of the ONUs for migrating the static configuration data to the target PON port according to the available bandwidth ratio in the same proportion; the available bandwidth ratio is the ratio of the maximum bandwidth of the target PON port and the total bandwidth requirement of the ONU of the static configuration data migrated to the target PON port.

And when the priorities of the ONUs migrating the static configuration data to the target PON port are different, distributing bandwidth for the ONUs according to the priorities of the ONUs.

It should be noted that, the bandwidth of an ONU refers to an exclusive bandwidth (such as a fixed bandwidth and a guaranteed bandwidth) allocated to the ONU, and not a shared bandwidth. (fixed bandwidth refers to being allocated to an ONU for use, even if the ONU is not in use, and guaranteed bandwidth refers to being allocated to an ONU for preferential use, all guaranteed bandwidth being allocated to the ONU when the ONU traffic is equal to or greater than the guaranteed bandwidth, and the remainder of the guaranteed bandwidth being shared among other ONUs when the ONU traffic is less than the guaranteed bandwidth). Both fixed bandwidth and guaranteed bandwidth are an exclusive bandwidth, which is also a standard mechanism in the field of communications.

In addition to exclusive bandwidth, there is also shared bandwidth (typically the maximum bandwidth). Maximum bandwidth refers to the maximum bandwidth that an ONU is allowed to use (its value is the same as the maximum physical bandwidth that the PON port can provide) without congestion. When there are multiple ONUs simultaneously having service requests, then all configured maximum bandwidth is actually shared among the multiple ONUs.

In some exemplary embodiments, the optical network unit satisfying the third preset condition includes at least one of:

an on-line optical network unit under a source PON port in a normal state in the source PON port cluster;

among the optical network units under the source PON port meeting the fourth preset condition in the PON port cluster, the on-line optical network unit in a fourth preset time period before the source PON port meeting the fourth preset condition detects the first alarm for the last time; wherein, the source PON interface satisfying the fourth preset condition comprises: a source PON port meeting the first switching condition; that is, in the optical network unit under the source PON port with the value of the corresponding register being true, the optical network unit is online in a fourth preset period of time before the source PON port with the value of the corresponding register being true detects the first alarm last time;

Among the optical network units under the source PON port meeting the fifth preset condition in the PON port cluster, the optical network unit which causes the first alarm detected last time; wherein, the source PON port satisfying the fifth preset condition comprises: a source PON port meeting the second switching condition or the third switching condition; i.e. the optical network unit under the source PON port for which the value of the corresponding register is a first preset character or a second preset character, results in the optical network unit of the first alarm detected last time.

In some exemplary embodiments, after migrating, from the optical network units under the source PON port in the PON port cluster that satisfies the fifth preset condition, static configuration data of the optical network unit that causes the first alert detected last time to one of the target PON ports in the target PON port group, the method further comprises:

and deleting the static configuration data of the optical network unit on the target PON port, which causes the last detected first alarm, under the condition that the optical network unit which causes the last detected first alarm is not on the target PON port in the sixth time period.

In some exemplary embodiments, when migrating the static configuration data of the optical network unit to the target PON port, none of the static configuration data of the optical network unit under the source PON port for which the value of the corresponding register is false is migrated to the target PON port.

In some exemplary embodiments, after switching the optical network unit under the source PON port in the source PON port cluster to one of the target PON ports in the target PON port group, the method further comprises: and managing static configuration data transferred to the target PON port according to the current idle resource occupation ratio of the target PON port.

In some exemplary embodiments, managing static configuration data migrated to the target PON port according to a current free-resource duty cycle of the target PON port comprises at least one of:

under the condition that the current idle resource ratio of the target PON port is larger than a fifth preset threshold value, the static configuration data is migrated to an optical network unit of the target PON port, and if the optical network unit is offline after being online, the static configuration data is kept unchanged on the target PON port, namely, no processing is performed;

under the condition that the current idle resource duty ratio of the target PON port is larger than a fourth preset threshold value and smaller than a fifth preset threshold value, the static configuration data is migrated to the optical network unit of the target PON port, if offline occurs after the optical network unit of the target PON port is online, the static configuration data under the target PON port is migrated to the optical network unit of the target PON port, and the static configuration data of the optical network unit without the configuration priority is emptied; the static configuration data under the target PON port is migrated to the optical network unit of the target PON port, and the static configuration data of the optical network unit with the configured priority is kept unchanged on the target PON port, namely, no processing is performed; wherein the ratio of the idle resources is the ratio of the idle resources to the total resources;

And under the condition that the current idle resource duty ratio of the target PON port is smaller than a fourth preset threshold value, the static configuration data is migrated to the optical network unit of the target PON port, and if the offline condition occurs after the optical network unit of the target PON port is on line, all the static configuration data of all the optical network units under the target PON port are emptied.

In some exemplary embodiments, after switching the optical network unit under the source PON port in the source PON port cluster to the target PON port in the target PON port cluster, the method further comprises: and acquiring static configuration data of the unauthorized optical network unit according to whether the idle resources exist at the target PON port and whether the idle resources of the target PON port are larger than or equal to the sum of resources required by the authentication of all the unauthorized optical network units.

In some exemplary embodiments, according to whether the target PON port has a free resource and whether the free resource of the target PON port is greater than or equal to a sum of resources required for authentication of all the unauthenticated optical network units, obtaining static configuration data of the unauthenticated optical network units includes at least one of:

under the condition that the idle resources exist at the target PON port and the idle resources of the target PON port are larger than or equal to the sum of the resources required by the authentication of all the unauthenticated optical network units, acquiring static configuration data of all the unauthenticated optical network units, and configuring the target PON port according to the acquired static configuration data; the non-authentication optical network unit is an optical network unit which does not migrate static configuration data to a target PON port in the source PON port cluster;

And under the condition that the idle resources exist in the target PON port and the idle resources of the target PON port are smaller than the sum of the resources required by the authentication of all the unauthenticated optical network units, preferentially acquiring static configuration data in the optical network unit data corresponding to the unauthenticated optical network unit identifiers from a second corresponding relation between the optical network unit identifiers and the optical network unit data, configuring the optical network unit according to the acquired static configuration data at the PON port, and acquiring the static configuration data of the optical network unit which cannot acquire the static configuration data from the second corresponding relation according to the residual idle resources of the target PON port, and configuring the optical network unit according to the acquired static configuration data at the PON port.

In some exemplary embodiments, obtaining static configuration data for all of the unauthenticated optical network units includes: searching static configuration data corresponding to the unauthenticated optical network unit identifier in a second corresponding relation between a preset optical network unit identifier and optical network unit data; wherein the optical network unit data comprises static configuration data of the optical network unit.

In some exemplary embodiments, the optical network unit data further comprises: ONU traffic data, ONU remote data, etc.

In some exemplary embodiments, for the un-authenticated optical network units for which the static configuration data is not found in the second correspondence, the OLT reports a notification message to the network management server to be processed according to the operator service issuing flow, so as to obtain the static configuration data of the un-authenticated optical network units for which the static configuration data is not found in the second correspondence.

In some exemplary embodiments, obtaining the static configuration data of the optical network unit for which the static configuration data cannot be obtained from the second correspondence comprises: triggering the business flow of the operator to re-issue the static configuration data.

In some exemplary embodiments, preferentially acquiring static configuration data in the optical network unit data corresponding to the unauthenticated optical network unit identity from the second correspondence between the optical network unit identity and the optical network unit data includes: and acquiring static configuration data in the optical network unit data corresponding to the unauthenticated optical network unit identifier from a second corresponding relation between the optical network unit identifier and the optical network unit data according to the priority of the unauthenticated optical network unit.

In some exemplary embodiments, obtaining static configuration data in the optical network unit data corresponding to the unauthenticated optical network unit identifier from a second correspondence between the optical network unit identifier and the optical network unit data according to the priority of the unauthenticated optical network unit includes: and acquiring static configuration data in the optical network unit data corresponding to the unauthenticated optical network unit identifier from a second corresponding relation between the optical network unit identifier and the optical network unit data according to the priority order of the unauthenticated optical network unit from high to low.

In some exemplary embodiments, after switching the optical network unit under the source PON port in the source PON port cluster to one of the target PON ports in the target PON port group, the method further comprises at least one of:

and under the condition that the rewinding condition is met, rewinding the optical network unit under the target PON port in the target PON port cluster to the corresponding source PON port in the source PON port cluster.

Wherein the rewind condition comprises at least one of:

all first alarms in the source PON port cluster are eliminated; that is, the values of the registers corresponding to all source PON ports in the source PON port cluster are not true, the first preset character, and the second preset character;

in the ONUs under the source PON port in the source PON port cluster, the sum of the number of ONUs on-line before switching but off-line after switching and the number of ONUs newly added off-line after switching is greater than the number of off-line ONUs triggering switching;

in the ONUs under the source PON port in the source PON port cluster, the sum of the weight of the ONU that is on-line before but off-line after the switching and the weight of the ONU that is newly added and is not on-line after the switching is greater than the weight of the off-line ONU that triggers the switching.

In some exemplary embodiments, the offline ONU triggering the switching may be an offline ONU under the source PON port in which the first alarm is detected in the source PON port cluster.

In some exemplary embodiments, the newly added ONU that is not on line after the switching refers to an ONU that is not connected to the source PON port before the switching, and is connected to the destination PON port after the switching.

In some exemplary embodiments, the weights of the optical network units are calculated according to parameters of the optical network units, the parameters of the optical network units including: the number of optical network units, the priority of the optical network units, etc.

In some exemplary embodiments, after the optical network unit under one target PON port in the target PON port group is switched back to a corresponding source PON port in the source PON port cluster, the method further comprises:

and in a fifth preset time period after the rewinding, under the condition that the optical network units below the source PON ports in the source PON port cluster are not reworked to one target PON port in the target PON port group, the static configuration data of the optical network units on the target PON ports are emptied.

In a second aspect, another embodiment of the present application provides an electronic device, including: at least one processor; and the memory is stored with at least one program, and when the at least one program is executed by the at least one processor, the trunk optical path protection method is realized.

Wherein the processor is a device having data processing capabilities including, but not limited to, a Central Processing Unit (CPU) or the like; the memory is a device with data storage capability including, but not limited to, random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically charged erasable programmable read-only memory (EEPROM), FLASH memory (FLASH).

In some embodiments, the processor, the memory, and the other components of the computing device are connected to each other via a bus.

In a third aspect, another embodiment of the present application provides a computer readable medium, where a computer program is stored, where the computer program when executed by a processor implements any one of the above-mentioned backbone optical path protection methods.

In a fourth aspect, referring to fig. 2, another embodiment of the present application provides a trunk optical path protection system, including: an optical line terminal and a trunk splitter; the optical line terminal is configured to determine, when at least one source PON port in the source PON port cluster detects a first alarm and determines that a switching condition is met according to the first alarm, a target PON port group corresponding to the source PON port cluster according to a first correspondence between a preset source PON port cluster and the target PON port group; switching an optical network unit under a source PON port in the source PON port cluster to one target PON port in the target PON port group; wherein, the number of source PON ports included in the source PON port cluster is greater than or equal to 2, and the target PON port group includes: 1 target PON port or 2 target PON ports which are in primary-standby relation; the main light path of the main light splitter is connected with the target PON port, and the branch light path of the main light splitter is connected with the standby main light path of the source PON port in the source PON port cluster.

In some exemplary embodiments, the trunk beam splitter is 1: n-beam splitter or 2: and N optical splitters, wherein N is the number of spare trunk optical paths connected by the trunk optical splitters.

The specific implementation process of the optical line terminal is the same as that of the trunk optical path protection method in the foregoing embodiment, and will not be repeated here.

Those of ordinary skill in the art will appreciate that all or some of the steps, systems, functional modules/units in the apparatus, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between the functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed cooperatively by several physical components. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.

Example embodiments have been disclosed herein, and although specific terms are employed, they are used and should be interpreted in a generic and descriptive sense only and not for purpose of limitation. In some instances, it will be apparent to one skilled in the art that features, characteristics, and/or elements described in connection with a particular embodiment may be used alone or in combination with other embodiments unless explicitly stated otherwise. It will therefore be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the scope of the present application as set forth in the following claims.

Claims

1. A trunk light path protection method comprises the following steps:

when at least one source PON port in a source PON port cluster detects a first alarm and a switching condition is judged to be met according to the first alarm, determining a target PON port group corresponding to the source PON port cluster according to a first corresponding relation between the source PON port cluster and the target PON port group which is preset;

switching an optical network unit under a source PON port in the source PON port cluster to one target PON port in the target PON port group; wherein, the number of source PON ports included in the source PON port cluster is greater than or equal to 2, and the target PON port group includes: 1 target PON port or 2 target PON ports which are in primary and standby relation.

2. The trunk optical path protection method of claim 1, wherein the determining that the switching condition is satisfied according to the first alarm includes at least one of:

judging that the first switching condition is met; wherein, the first switching condition includes: the number of the offline optical network units under the source PON port in a first preset time period before the first alarm is detected is larger than or equal to a first preset threshold value, and the fact that the second alarm is not detected in a second preset time period is judged;

judging that the first alarm meets a second switching condition, wherein the number of source PON ports meeting a first preset condition or the proportion of the number of source PON ports meeting the first preset condition in the source PON port cluster is larger than or equal to a second preset threshold, or the number of source PON ports meeting the second preset condition in the source PON port cluster or the proportion of the number of source PON ports meeting the second preset condition is larger than or equal to a third preset threshold; wherein the second switching condition includes: only one optical network unit is offline under the source PON port in a third preset time period before the first alarm is detected, and no second alarm is detected in a second preset time period before the first alarm is detected;

Judging that the first alarm meets a second switching condition, and the number of source PON ports meeting a second preset condition or the proportion of the number of source PON ports meeting the second preset condition in the source PON port cluster is larger than or equal to a third preset threshold;

wherein the first preset condition includes: only one optical network unit under the source PON port is offline within a third preset time before the source PON port detects the first alarm for the last time, and no second alarm is detected within a second preset time period before the source PON port detects the first alarm for the last time;

the second preset condition includes: the first alarm recovery time is greater than or equal to an average offline-to-online recovery time of the optical network unit under the source PON port.

3. The trunk optical path protection method of claim 1, wherein the switching the optical network unit under the source PON port in the source PON port cluster to one target PON port in the target PON port group comprises:

and switching the optical network units under the source PON ports in the source PON port cluster to the target PON ports with highest priority and available priority in the target PON port group according to the priority of the target PON ports in the target PON port group.

4. The trunk optical path protection method of claim 2, wherein the switching the optical network unit under the source PON port in the source PON port cluster to one target PON port in the target PON port group comprises:

and migrating the static configuration data of the optical network unit to the target PON port.

5. The trunk optical path protection method of claim 4, wherein the migrating the static configuration data of the optical network unit to the target PON port comprises:

migrating static configuration data of all on-line optical network units under all source PON ports in the source PON port cluster to the target PON port under the condition that the resource ratio of the target PON port to the source PON port cluster is greater than or equal to 1; wherein the resource ratio is according to the formulaCalculating to obtain; wherein the RAT is _r For the resource ratio, R _so R is the average online resource number of the source PON port cluster _da N is the maximum available resource number of the target PON port _p For the number of source PON ports in the source PON port cluster, N _e And the number of source PON ports is the number of source PON ports with tolerable main light path faults in the source PON port cluster.

6. The trunk optical path protection method of claim 5, the migrating the static configuration data of the optical network unit to the target PON port further comprising:

When the resource ratio of the target PON port to the source PON port cluster is less than 1, preferentially migrating static configuration data of an optical network unit having a priority higher than or equal to a first priority threshold among optical network units satisfying a third preset condition to the target PON port according to the priority of the optical network units under the source PON port in the source PON port cluster, and secondly migrating static configuration data of an optical network unit having a priority higher than or equal to a second priority threshold among the optical network units satisfying the third preset condition to the target PON port according to the priority of the source PON port in the source PON port cluster;

wherein the static configuration data comprises registration data; or the static configuration data includes registration data and service data.

7. The backbone optical path protection method according to claim 6, wherein the optical network unit satisfying the third preset condition comprises at least one of:

among the optical network units under the source PON port satisfying the fourth preset condition in the PON port cluster, an on-line optical network unit is in a fourth preset period of time before the source PON port satisfying the fourth preset condition last detects the first alarm; wherein, the source PON interface satisfying the fourth preset condition comprises: a source PON port meeting the first switching condition;

Among the optical network units under the source PON port in the PON port cluster satisfying a fifth preset condition, an optical network unit of the first alarm detected last time is caused; wherein, the source PON port satisfying the fifth preset condition comprises: and the source PON port meets the second switching condition.

8. The trunk optical path protection method according to claim 4, wherein after the switching the optical network unit under the source PON port in the source PON port cluster to one of the target PON ports in the target PON port group, the method further comprises:

and managing static configuration data transferred to the target PON port according to the current idle resource occupation ratio of the target PON port.

9. The trunk optical path protection method according to claim 4, wherein after the switching the optical network unit under the source PON port in the source PON port cluster to one of the target PON ports in the target PON port group, the method further comprises:

and acquiring static configuration data of the unauthorized optical network unit according to whether the idle resources exist at the target PON port and whether the idle resources of the target PON port are larger than or equal to the sum of resources required by the authentication of all the unauthorized optical network units.

10. The trunk optical path protection method according to claim 4, wherein after the switching the optical network unit under the source PON port in the source PON port cluster to one of the target PON ports in the target PON port group, the method further comprises:

Under the condition that the rewinding condition is met, rewinding the optical network unit under the target PON port in the target PON port cluster to the corresponding source PON port in the source PON port cluster;

wherein the rewind condition comprises at least one of:

all first alarms in the source PON port cluster are eliminated;

in the optical network units under the source PON port in the source PON port cluster, the sum of the number of the optical network units which are on-line before switching but off-line after switching and the number of the newly added optical network units which are not on-line after switching is larger than the number of the off-line optical network units triggering switching;

in the optical network units under the source PON ports in the source PON port cluster, the sum of the weight of the optical network units that are on-line before but off-line after the switching and the weight of the newly added optical network units that are not on-line after the switching is greater than the weight of the off-line optical network units that trigger the switching.

11. The trunk optical path protection method of claim 10, after the optical network unit under one target PON port in the set of target PON ports is rewound to a corresponding source PON port in the source PON port cluster, the method further comprises:

and in a fifth preset time period after the rewinding, under the condition that the optical network units under the source PON ports in the source PON port cluster are not reworked to one target PON port in the target PON port group, the static configuration data of the optical network units on the target PON ports are emptied.

12. An electronic device, comprising:

at least one processor;

a memory having at least one program stored thereon, which when executed by the at least one processor, implements the backbone path protection method of any one of claims 1-11.

13. A computer readable medium having stored thereon a computer program which, when executed by a processor, implements the backbone light protection method of any one of claims 1-11.

14. A backbone optical path protection system, comprising: an optical line terminal and a trunk splitter;

the optical line terminal is configured to determine, when at least one source PON port in a source PON port cluster detects a first alarm and it is determined that a switching condition is met according to the first alarm, a target PON port group corresponding to the source PON port cluster according to a first correspondence between a preset source PON port cluster and a target PON port group; switching an optical network unit under a source PON port in the source PON port cluster to one target PON port in a target PON port group; wherein, the number of source PON ports included in the source PON port cluster is greater than or equal to 2, and the target PON port group includes: 1 target PON port or 2 target PON ports which are in primary-standby relation;

The main optical path of the main optical splitter is connected with the target PON port, and the branch optical path of the optical splitter is connected with the standby main optical path of the source PON port in the source PON port cluster.

15. The trunk optical path protection system of claim 14, wherein the trunk optical splitter is 1: n-beam splitter or 2: and N optical splitters, wherein N is the number of spare trunk optical paths connected with the trunk optical splitters.