WO2016188187A1

WO2016188187A1 - Testing method and device for passive optical network alarm

Info

Publication number: WO2016188187A1
Application number: PCT/CN2016/076007
Authority: WO
Inventors: 郭敬文
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-05-25
Filing date: 2016-03-09
Publication date: 2016-12-01
Also published as: CN106301837A; CN106301837B

Abstract

Provided in the present invention are a testing method and device for a passive optical network alarm. The method comprises: receiving, by an optical line terminal (OLT), a power-cut alarm reported by an optical network unit (ONU), and comparing a difference between a generation time point of the power-cut alarm and a receiving time point of the power-cut alarm of the OLT to a preset time slice threshold; if the difference meets the preset time slice threshold, then determining that the ONU meets a power-cut alarm condition, and counting a number of ONUs meeting the power-cut alarm condition of a port of the passive optical network (PON) to which the ONU belongs; and comparing the number of the ONUs to a total number of the ONUs of the PON port, and if the comparison result meets a preset requirement, then determining that the area in which the PON is located has a power cut. The present invention addresses a problem of processing inconvenience of an ONU power-cut alarm and improves convenience of network operation and maintenance for an operator.

Description

Passive optical network alarm detection method and device

Technical field

The present invention relates to the field of communications, and in particular to a passive optical network alarm detection method and apparatus.

Background technique

Passive Optical Network (PON) technology is currently the preferred and mainstream technology in the field of optical access networks. It has obvious access rate, bandwidth efficiency and split ratio, full service carrying capacity and security. Advantage. The PON technology is also divided into an Ethernet Passive Optical Network (EPON) and a Gigabit Passive Optical Network (GPON). The EPON technology is provided by the Institute of Electrical and Electronics Engineers (Institute for Electrical). And Electronic Engineers (referred to as IEEE) IEEE 802.3's Ethernet for the First Mile (EFM) working group standardization; GPON technology is the International Telecommunications Union-International Telecommunications Union- The Telecommunications standardization sector (referred to as ITU-T) is proposed and standardized.

A typical PON system is composed of an optical line terminal (OLT), an optical network unit (ONU), and an optical distribution network (ODN). Commonly used business scenarios are Fiber To The Home (FTTH) and Fiber To The Building (FTTB). In the FTTH scenario, each home deploys an ONU to provide data and voice services for a single home. In the FTTB scenario, the ONU is deployed in the corridor and then through the cable and the user's home network (Home Network, HN for short). connection. In the operation and maintenance management of the passive PON network, the operator usually has a dedicated network monitoring center to monitor the running status of the devices in the network in real time. If the device reports alarms, it usually sends out work orders and arranges related maintenance. The engineer is troubleshooting. In the FTTB scenario, the ONU is deployed in the corridor and is not accessible to users. Usually, the ONU is powered off due to a failure of the ONU's power module. In the FTTB scenario, once the ONU is powered off, the user service of the entire building will be interrupted, which will lead to multi-user reporting and complaints. Therefore, in the FTTB scenario, the network monitoring center will focus on the ONU power failure alarm network. Once such an alarm is received, the work order will be issued immediately and the relevant maintenance engineers will be arranged.

However, in actual operation and maintenance, such a problem often occurs. In the network monitoring center of the operator, multiple ONU power failure alarms are received. When the work order is scheduled, the maintenance engineers often arrive at the scene and find that The ONU is powered off due to a power system failure and a power outage in the entire cell. What's more, the power system is often debugged, resulting in a short time in the cell. Therefore, the handling of alarms for the ONU outage caused by the power outage of the cell in the FTTB scenario is becoming more and more important in the operation and maintenance management process of the operator. Pain points.

In view of the inconvenience of handling the alarm of the ONU power failure in the related art, an effective solution has not been proposed yet.

Summary of the invention

The invention provides a method and a device for detecting an alarm of a passive optical network, so as to at least solve the problem that the processing of the alarm of the ONU power failure in the related art is inconvenient.

According to an embodiment of the present invention, a passive optical network alarm detection method is provided, including:

The optical fiber line terminal OLT receives the power failure alarm reported by the ONU of the optical network unit;

Comparing the difference between the generation time of the power-off alarm and the receiving time of the power-off alarm received by the OLT, and comparing the preset time slice threshold, where the difference reaches the preset time slice In the case of a threshold, determining that the ONU meets the power failure alarm requirement;

Counting the number of ONUs that meet the power failure alarm requirement under the PON port of the passive optical network to which the ONU belongs, and comparing the number of ONUs with the total number of ONUs under the PON port;

If the result of the comparison meets a preset requirement, determining that the cell where the PON is located is powered off.

In the embodiment of the present invention, if the result of the comparison meets a preset requirement, determining that the cell in which the PON is located is powered off includes:

If the number of ONUs in the PON port that meet the power failure alarm requirement is equal to the total number of ONUs in the PON port, determine that the cell in which the PON is located is powered off.

In the embodiment of the present invention, the power failure alarm reported by the ONU is added to the created queue, and the difference between the receiving time in the power failure alarm of the queue head and the generation time in the power failure alarm record is cyclically detected. And if the difference reaches the preset time slice threshold, the power failure alarm of the queue header is removed.

In the embodiment of the present invention, the power-off alarms in the queue are grouped according to the PON port to which the ONU belongs;

The loop detection is performed in sequence according to the grouping.

In an embodiment of the present invention, in a case where it is determined that the cell where the PON is located is powered off, the method further includes at least one of the following:

Discarding the reported power failure alarm;

Generating a cell power failure alarm indication of the PON, and sending the cell power failure alarm indication to a network control center.

According to another embodiment of the present invention, a passive optical network alarm detecting apparatus is further provided, including:

The receiving module is configured to receive the power-off alarm reported by the optical network unit ONU by the optical line terminal OLT;

a comparison module, configured to compare a difference between a generation time of the power failure alarm and a reception time of the power failure alarm received by the OLT, with the preset time slice threshold, where the difference is reached In the case of the preset time slice threshold, determining that the ONU meets the power failure alarm requirement;

The statistics module is configured to count the PON port of the passive optical network to which the ONU belongs to meet the power failure alarm requirement Number of ONUs, and comparing the number of ONUs with the total number of ONUs under the PON port;

The determining module is configured to determine that the cell where the PON is located is powered off if the result of the comparison meets a preset requirement.

In an embodiment of the invention, the determining module comprises:

The first determining unit is configured to determine that the number of ONUs that meet the power-off alarm requirement under the PON port is equal to the total number of ONUs under the PON port, and determine that the cell where the PON is located is powered off.

In an embodiment of the invention, the comparing module comprises:

a first comparison unit, configured to add a power failure alarm reported by the ONU to the created queue, and cyclically detect a difference between a reception time in the power failure alarm of the queue head and a generation time in the power failure alarm record, And if the difference reaches the preset time slice threshold, the power failure alarm of the queue header is removed.

In an embodiment of the invention, the device further includes:

a grouping module, configured to group the power-off alarms in the queue according to the PON port to which the ONU belongs;

The first comparison unit is further configured to perform the loop detection in sequence according to the grouping.

In an embodiment of the invention, the device further includes:

The discarding module is configured to discard the reported power-off alarm when the cell in which the PON is located is powered off;

The reporting module is configured to generate a cell power-off alarm indication of the PON, and send the cell power-off alarm indication to the network control center, when determining that the cell where the PON is located is powered off.

According to the present invention, the fiber-optic line terminal OLT receives the power-off alarm reported by the optical network unit ONU, and the difference between the time when the power-off alarm is generated and the time when the OLT receives the power-off alarm is The preset time slice threshold is compared. If the difference reaches the preset time slice threshold, the ONU is determined to meet the power failure alarm requirement, and the PON port of the passive optical network to which the ONU belongs is counted. Determining the number of ONUs required by the power failure alarm, and comparing the number of ONUs with the total number of ONUs under the PON port, and determining that the cell in which the PON is located is powered off if the result of the comparison meets a preset requirement The problem of inconvenient handling of the ONU power failure alarm is solved, and the convenience of the operator operation and maintenance management network is improved.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a flowchart of a method for detecting an alarm of a passive optical network according to an embodiment of the present invention;

2 is a structural block diagram of a passive optical network alarm detecting apparatus according to an embodiment of the present invention;

FIG. 3 is a flowchart of detecting a power failure alarm of a PON port cell in a passive optical network according to an embodiment of the present invention.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It is to be understood that the terms "first", "second" and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not necessarily used to describe a particular order or order.

In this embodiment, a passive optical network alarm detection method is provided. FIG. 1 is a flowchart of a passive optical network alarm detection method according to an embodiment of the present invention. As shown in FIG. 1 , the flow includes the following steps. :

Step S12, the optical line terminal OLT receives the power failure alarm reported by the ONU of the optical network unit;

Step S14, comparing the difference between the generation time of the power-off alarm and the receiving time of the power-off alarm received by the OLT, and comparing with the preset time slice threshold, when the difference reaches the preset time slice threshold Next, it is determined that the ONU meets the power failure alarm requirement;

Step S16: Count the number of ONUs that meet the power failure alarm requirement of the PON port of the passive optical network to which the ONU belongs, and compare the number of ONUs with the total number of ONUs under the PON port;

Step S18: If the result of the comparison meets the preset requirement, determine that the cell where the PON is located is powered off.

Through the above steps, the OLT receives the power-off alarm reported by the ONU of the optical network unit. According to the generation time of the power-off alarm, the OLT receives the reception time of the power-off alarm and the PON port of the passive optical network to which the ONU belongs. The number of ONUs required for the power failure alarm determines whether the cell in which the PON is located is powered off, and does not need to receive a power failure alarm to issue a work order, arranges the maintenance engineer to go to the site for processing, and determines that the alarm of the ONU power failure is inconvenient to handle. The problem has improved the convenience of the operator's operation and maintenance management network.

In this embodiment, there may be multiple preset requirements for the compliance, for example, when the comparison result is that the number of ONUs that meet the power-off alarm requirement under the PON interface accounts for a majority of the total number of ONUs under the PON port. If the number of ONUs in the PON port that meet the power failure alarm requirement is equal to the total number of ONUs under the PON port, the number of ONUs in the PON port is determined to be the same as the preset requirement. The cell where the PON is located is powered off.

In this embodiment, the power-off alarm reported by the ONU may be added to the created queue, where the queue may be a first-in-first-out queue, and the receiving time and the power-off alarm record in the power-off alarm of the queue head are cyclically detected. The difference in the generation time in the case where the difference reaches the preset time slice threshold, the power failure alarm of the queue header is removed. At the same time, the power failure alarm in the queue may be grouped according to the PON port of the ONU, and the power failure alarm of the loop detection queue is sequentially performed according to the group.

In this embodiment, in the case that the cell in which the PON is located is powered off, the reported power failure alarm may be discarded, and the cell power failure alarm indication of the PON may be generated, and the cell power failure alarm indication is sent to the network control center. .

In this embodiment, a passive optical network alarm detecting device is also provided, which is used to implement the foregoing embodiments and preferred embodiments, and has not been described again. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

2 is a structural block diagram of a passive optical network alarm detecting apparatus according to an embodiment of the present invention. As shown in FIG. 2, the apparatus includes

The receiving module 22 is configured to receive the power failure alarm reported by the optical network unit ONU by the optical line terminal OLT;

The comparison module 24 is configured to compare the difference between the generation time of the power-off alarm and the reception time of the power-off alarm received by the OLT, and compare the preset time slice threshold, and the difference reaches the preset time slice. In the case of a threshold, it is determined that the ONU meets the power failure alarm requirement;

The statistics module 26 is configured to count the number of ONUs that meet the power failure alarm requirement of the PON port of the passive optical network to which the ONU belongs, and compare the number of ONUs with the total number of ONUs under the PON port;

The determining module 28 is configured to determine that the cell in which the PON is located is powered off if the result of the comparison meets a preset requirement.

Through the foregoing device, the OLT receives the power failure alarm reported by the ONU of the optical network unit, and according to the generation time of the power failure alarm, the OLT receives the reception time of the power failure alarm, and the PON port of the passive optical network to which the ONU belongs is met. The number of ONUs required for the power failure alarm determines whether the cell in which the PON is located is powered off, and does not need to receive a power failure alarm to issue a work order, arranges the maintenance engineer to go to the site for processing, and determines that the alarm of the ONU power failure is inconvenient to handle. The problem has improved the convenience of the operator's operation and maintenance management network.

In this embodiment, the determining module 28 includes:

In this embodiment, the comparison module 24 includes:

The first comparison unit is configured to add the power failure alarm reported by the ONU to the created queue, and cyclically detect a difference between the reception time in the power failure alarm of the queue head and the generation time in the power failure alarm record, where the difference is When the value reaches the preset time slice threshold, the power failure alarm of the queue header is removed.

In this embodiment, the device further includes:

The first comparison unit is further arranged to perform the loop detection in sequence according to the grouping.

In this embodiment, the device further includes:

The reporting module is configured to generate a cell power failure alarm of the PON when determining that the cell in which the PON is located is powered off Instructing to send the cell power failure alarm indication to the network control center.

The invention will now be described in detail in conjunction with the preferred embodiments and embodiments.

The preferred embodiment improves a passive optical network system (PON) for use in the management of EPON or GPON network element devices, including optical line terminals OLT and optical network unit ONUs. It provides an alarm detection method for a PON port service interruption caused by a cell power failure in a passive optical network.

The preferred embodiment solves the pain point of the operator in the operation and maintenance process of the passive optical network system. When the cell is powered off, the cause of the fault is determined. When the alarm is reported to the network monitoring center, a large number of ONUs are not reported. The power-off alarm is reported to the cell power-off alarm at the PON port level, so that the operation and maintenance personnel of the network monitoring center can recognize the cell power-off at a glance.

The preferred embodiment is based on the power failure alarms of different ONUs received under the same PON port, and compares the reporting time of the ONU power failure alarms, and then finds a set of PON port community power failures according to the characteristics of the deployed ONUs of the operators. The method of alarming.

Due to the networking characteristics of the passive optical network, the networking structure is that the PON port is connected to the optical splitter, and the optical splitter separates the trunk optical fiber into multiple branch optical fibers, and each branch optical fiber is connected to the ONU. The number of branch fibers that can be separated by one backbone fiber is limited due to optical signal strength and the like. In actual use, usually 32 to 64 ONUs can be connected under one PON port, and the maximum case is no more than 256 ONUs. Therefore, in terms of cost, the physical location of the ONU under the same PON port is not too far, usually in a cell. Even in a densely populated cell, the operator will reserve the idle branch fiber under the PON port for expansion, instead of pulling the fiber to other cells.

Another feature of the cell power-down alarm is that after the cell is powered off, the affected ONUs report the power-off alarms in a short period of time. Therefore, if the OLT network element is in a short period of real (experience data is 01. Seconds) When receiving a power failure alarm for multiple ONUs under the same PON port, it is basically determined that a cell power failure occurs in the cell where the ONU connected to the PON port is located.

Based on the above two characteristics, it can be determined based on the information whether a cell power failure alarm has occurred.

In the preferred embodiment, a method for detecting a power failure alarm of a PON port in a passive optical network is provided, and the method includes the following steps:

Step 1: The ONU of the network needs to support the "Dying Gasp" alarm function, that is, the ONU can report the power failure alarm information to the OLT network element immediately before the power failure.

Step 2: After receiving the alarm reported by the ONU, the OLT does not immediately report the power to the NMS but enters the local cache queue. Other alarms are immediately forwarded to the NMS.

Step 3: Take the time when the first alarm of the queue is taken, and compare with the current detection time to see if the time difference reaches the set time slice value. If the set threshold is not reached, the sleep time of the sleep is set again, and the first part of the queue is detected again. Whether the difference from the current detection time reaches the set time slice value. This cycle until it is detected that the time difference reaches or exceeds the set delay time slice value.

In step 4, the time when the current queue header alarm is marked is T, and the time slice value set in step 3 is marked as S. From The queue header first removes the ONU power failure alarm record and puts it into the processing queue until the alarm at the head of the column occurs later than T+S. In the processing queue, all ONU power-off alarms are grouped according to the location of the PON port, and the ONU power-off alarms under the same PON port are placed in a set, and each set is identified by the PON port position.

Step 5: For each set generated in step 4, calculate the ONU number A of the ONU power failure alarm reported by the PON port, and then according to the processing time slice saved in the system, the number of active ONUs under the PON port is B, if A =B, the PON port community interrupt alarm is reported, and the power-off alarm of each ONU is not reported. Otherwise, the power-off alarm of each ONU is reported as before.

In the step 1, the following steps can be extended:

The ONU reports the "Dying Gasp" alarm function, including but not limited to the use of a capacitor to report the power failure alarm to the OLT immediately before the ONU is powered off.

In the step 2, the following steps can be extended:

The processing logic described in step 5 also includes a special case where only the online ONU is available under the PON port. In this case, because the probability of false alarms is too high, the previous algorithm is no longer used, but the ONU is continuously reported. Power failure alarm.

In the preferred embodiment, the cell power failure is detected by the physical distribution characteristics of the ONU under the PON port and the timing characteristics of the power failures reported by the ONUs under the PON port. The program is innovative, and it is not found in the prior art and the solution. The preferred embodiment solves the problem that cannot be solved by other technologies, and can find the PON port community power failure alarm that is difficult to detect by other technical means, thereby solving the pain point of the operator in the operation and maintenance process.

The present invention further provides another embodiment. The preferred embodiment detects the cell power failure by using the physical location distribution feature of the ONU under the PON port and the timing characteristics of the power failure of each ONU under the PON port when the cell is powered off. .

FIG. 3 is a flowchart of detecting a power failure alarm of a PON port cell in a passive optical network according to an embodiment of the present invention. As shown in FIG. 3, a process of detecting a power failure alarm of a PON port cell is illustrated.

Step 101: The OLT network element monitors the alarm reported by the ONU.

The OLT NE listens to alarms reported by all ONUs. The ONU needs to ensure that the ONU has the ability to report the ONU power failure alarm. That is, the ONU relies on the capacitor or other technology to ensure that the OLT network element can report the power failure alarm.

Step 102: After the OLT receives the alarm, determine the type of the alarm.

After receiving the alarm reported by the ONU, the OLT determines whether it is an ONU power failure alarm. If it is an ordinary non-ONU power failure alarm, go to step 110; if it is an ONU power failure alarm, go to step 103.

Step 103: Add an ONU power failure alarm to the cache queue.

A first-in first-out (FIFO) queue is created, and the ONU power-off alarms are added to the queue according to the alarm reporting time. Because it is a FIFO queue, the alarm at the head of the queue is the earliest, and the alarm at the end of the queue occurs at the latest.

Step 104: cyclically check whether the difference between the occurrence time of the first alarm of the queue and the current detection time reaches a set threshold;

Obtain the time when the buffer queue header alarm occurs, and calculate whether the current detection time difference reaches the set processing time slice threshold. If the time difference does not reach the threshold, then go to step 105; if the time difference reaches or exceeds the threshold, go to step 106.

Based on a large amount of laboratory data, it is appropriate to set the processing time slice threshold to 0.1 second. Further, in order to ensure the accuracy of the detection method in actual engineering use, the threshold value is saved in the configuration file, and in actual engineering, it can be adjusted according to the actual situation on site.

Step 105: Detect that the process sleeps for a given time;

In step 104, if it is checked that the time difference between the beginning and the end of the queue is less than the set threshold, then the given time is hibernated.

Based on a large amount of laboratory data, it is appropriate to detect that the process sleep time is between one-third and one-half of the processing time slice threshold. Further, in order to ensure the accuracy of the detection method in actual engineering use, the sleep time is saved in the configuration file, and in actual engineering, it can be adjusted according to the actual situation on site.

Step 106: Move the ONU power failure alarm into the processing queue;

The time when the ONU power-off alarm of the buffer queue header in step 104 is recorded as A, and the processing time slice threshold is recorded as B, then the ONU power-off alarm record of the cache queue header is sequentially queried, and the alarm occurrence time of this record is marked as T. . If A+B>=T, the alarm cache queue header is removed and added to the processing queue. The current header record of the cache queue is processed in sequence until the above judgment condition is not satisfied.

Step 107: The alarms in the processing queue are grouped according to the PON where the ONU is located;

The ONUs in the processing queue are grouped according to the PON port to which the ONU belongs, and each PON port is a packet. The PON port grouping in the processing queue is processed sequentially until all PON ports are processed. The processing logic for each PON is as shown in step 108.

Step 108: Determine whether there is only one ONU in the packet;

For each PON port grouping, first determine whether it is a special case, that is, there is only one ONU under the PON port. If there is only one ONU in the PON port packet, go to step 110; if the number of ONUs in the PON port is greater than 1, go to step 109.

Step 109: Determine whether it is a PON port cell power failure alarm;

The total number of ONUs in the PON port group is recorded as A, and then the number of online ONUs under the PON port before the processing time slice is queried from the system, which is recorded as B. If A=B, the online ONU under the PON port is processed in one process. If the power is off during the time slice, it is determined that the PON port cell is powered off, and the process proceeds to step 110; otherwise, the process proceeds to step 110.

Step 110: The non-PON port power failure alarm directly forwards the original alarm to the network management.

For the normal situation that the non-PON port is powered off, the alarm reported by the original ONU can be directly forwarded to the NMS.

Step 111: Discard the ONU power failure alarm;

In the case of a PON port cell power failure alarm, alarm suppression processing is required. You need to discard the ONU power failure alarm reported by each ONU under the PON port.

Step 112: Reporting a power failure alarm of the PON port to the network management system;

A new PON port cell power failure alarm is generated by the OLT network element, and the alarm is reported to the network management system.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, The optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.

Embodiments of the present invention also provide a storage medium. Optionally, in this embodiment, the foregoing storage medium may be configured to store program code for performing the method steps of the above embodiment:

Optionally, in this embodiment, the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory. A variety of media that can store program code, such as a disc or a disc.

Optionally, in the embodiment, the processor executes the method of the above embodiment according to the stored program code in the storage medium.

It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

According to the foregoing technical solution provided by the embodiment of the present invention, the optical fiber line terminal OLT receives the power failure alarm reported by the optical network unit ONU, and generates the power failure alarm generation time and the OLT receives the power failure alarm receiving time. The difference is compared with the preset time slice threshold. If the difference reaches the preset time slice threshold, determining that the ONU meets the power failure alarm requirement, and collecting the passive to which the ONU belongs The optical network PON port meets the power failure notice The number of ONUs required by the police is compared with the total number of ONUs under the PON port. If the result of the comparison meets the preset requirement, the cell in which the PON is located is determined to be powered off, and the ONU is resolved. The problem of inconvenient handling of power-off alarms improves the convenience of the operator's operation and maintenance management network.

Claims

A passive optical network alarm detection method includes:

The optical fiber line terminal OLT receives the power failure alarm reported by the ONU of the optical network unit;

Comparing the difference between the generation time of the power-off alarm and the receiving time of the power-off alarm received by the OLT, and comparing the preset time slice threshold, where the difference reaches the preset time slice In the case of a threshold, determining that the ONU meets the power failure alarm requirement;

Counting the number of ONUs that meet the power failure alarm requirement under the PON port of the passive optical network to which the ONU belongs, and comparing the number of ONUs with the total number of ONUs under the PON port;

If the result of the comparison meets a preset requirement, determining that the cell where the PON is located is powered off.
The method according to claim 1, wherein, if the result of the comparison meets a preset requirement, determining that the cell in which the PON is located is powered off comprises:

If the number of ONUs in the PON port that meet the power failure alarm requirement is equal to the total number of ONUs in the PON port, determine that the cell in which the PON is located is powered off.
The method of claim 1 wherein the method further comprises:

Adding a power failure alarm reported by the ONU to the created queue, and periodically detecting a difference between a receiving time in the power failure alarm of the queue head and a generation time in the power failure alarm record, where the difference reaches the In the case of the preset time slice threshold, the power failure alarm of the queue header is removed.
The method of claim 3, wherein the method further comprises:

And the power failure alarms in the queue are grouped according to the PON port to which the ONU belongs;

The loop detection is performed in sequence according to the grouping.
The method according to any one of claims 1 to 4, wherein in the case of determining that the cell in which the PON is located is powered off, the method further comprises at least one of the following:

Discarding the reported power failure alarm;

Generating a cell power failure alarm indication of the PON, and sending the cell power failure alarm indication to a network control center.
A passive optical network alarm detecting device includes:

The receiving module is configured to receive the power-off alarm reported by the optical network unit ONU by the optical line terminal OLT;

a comparison module, configured to compare a difference between a generation time of the power failure alarm and a reception time of the power failure alarm received by the OLT, with the preset time slice threshold, where the difference is reached In the case of the preset time slice threshold, determining that the ONU meets the power failure alarm requirement;

The statistics module is configured to count the PON port of the passive optical network to which the ONU belongs to meet the power failure alarm The number of ONUs required, and comparing the number of ONUs with the total number of ONUs under the PON port;

The determining module is configured to determine that the cell where the PON is located is powered off if the result of the comparison meets a preset requirement.
The apparatus of claim 6 wherein said determining module comprises:

The first determining unit is configured to determine that the number of ONUs that meet the power-off alarm requirement under the PON port is equal to the total number of ONUs under the PON port, and determine that the cell where the PON is located is powered off.
The apparatus of claim 6 wherein said comparing module comprises:

a first comparison unit, configured to add a power failure alarm reported by the ONU to the created queue, and cyclically detect a difference between a reception time in the power failure alarm of the queue head and a generation time in the power failure alarm record, And if the difference reaches the preset time slice threshold, the power failure alarm of the queue header is removed.
The apparatus of claim 8 wherein said apparatus further comprises:

a grouping module, configured to group the power-off alarms in the queue according to the PON port to which the ONU belongs;

The first comparison unit is further configured to perform the loop detection in sequence according to the grouping.
The apparatus according to any one of claims 6 to 9, wherein the apparatus further comprises:

The discarding module is configured to discard the reported power-off alarm when the cell in which the PON is located is powered off;

The reporting module is configured to generate a cell power-off alarm indication of the PON, and send the cell power-off alarm indication to the network control center, when determining that the cell where the PON is located is powered off.