CN113727223B - Uplink data transmission method, abnormal light emitting detection method, equipment and system - Google Patents
Uplink data transmission method, abnormal light emitting detection method, equipment and system Download PDFInfo
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Abstract
The invention discloses an uplink data transmission method, an abnormal light emission detection method, equipment and a system, and relates to the technical field of passive optical networks. The uplink data transmission method comprises the following steps: each ONU receives an uplink bandwidth time slot distributed by the OLT; and emits light in the uplink bandwidth time slot and transmits uplink service, and transmits pseudo-random code in the non-uplink bandwidth time slot. The abnormal light emission detection method includes: the OLT periodically allocates uplink bandwidth time slots for each ONU; receiving uplink burst data sent by each ONU, and judging whether all uplink bursts can be delimited successfully or not; when the delimitation fails, the uplink burst is taken as a unit, corresponding detection is carried out according to different delimitation failure conditions, and whether the abnormal luminescence is caused or not is determined; and positioning the abnormal light-emitting ONU. The method solves the problem of randomness of influence of abnormal light emission on other ONUs, can rapidly and effectively detect various different types of abnormal light emission, has a wide detection range, and meets the actual application requirements.
Description
Technical Field
The invention relates to the technical field of passive optical networks, in particular to an uplink data transmission method, an abnormal light emission detection method, equipment and a system.
Background
In the technical field of passive optical networks, a simplest networking is composed of an OLT (Optical Line Terminal ), an optical splitter and a plurality of ONUs (Optical Network Unit, optical network units). Wherein the OLT relies on optical splitters to form a point-to-multipoint network topology. Because of the specificity of the topological structure, the OLT sends data to each ONU in a broadcasting mode, after receiving the broadcasting data, the ONU only receives the data belonging to the ONU, and the data of other ONUs are directly discarded; in the uplink direction, the ONU adopts a time division multiple access mode to send data to the OLT, and because each ONU has own time slot and the time slots are not overlapped, the conflict of different ONUs in the uplink data sending process can be avoided, and the normal sending of the data of all ONUs is ensured.
Typically, the OLT periodically allocates upstream bandwidth slots to ONUs. In an allocation period, an ONU has only one upstream bandwidth slot, and the allocation sequence of the upstream bandwidth slots is related to the sequence in which the ONUs complete registration. The OLT sends the upstream bandwidth time slots to the ONUs by broadcasting. After the ONU obtains the uplink bandwidth time slot allocated by the OLT, the ONU sends data to the OLT in an uplink burst manner strictly according to the range of the time slot. The uplink burst consists of a burst delimiter and data to be transmitted. The OLT can obtain the transmission data of the ONU after the delimitation is successful. If the delimitation fails, all the sent data of the ONU is discarded, and the passive optical network is abnormal.
In actual use, due to the reasons of abnormality of the optical module, equipment aging and the like, the light-off time of the ONU may be delayed to a certain extent, resulting in abnormal light emission. When the abnormal light emitting duration of one ONU exceeds a certain range, the influence on other ONUs is generated, the influence is strong or weak, and the phenomenon that one part of the affected ONUs work normally and the other part of the affected ONUs are offline abnormally occurs. Abnormal light emission is difficult to locate and recover due to the randomness of the affected ONU anomalies.
At present, the traditional method for detecting the abnormal light emission of the ONU is as follows: after detecting the long light emission, the OLT controls the ONU to turn off or restart in a manner of issuing an OAM (Operation Administration and Maintenance ) protocol message, so as to locate which ONU has a fault. However, since each ONU needs to be sequentially excluded, in an extreme case, a situation may occur in which all ONUs are excluded once, and the detection efficiency is low. On the other hand, the method can only detect long luminescence, has a narrow detection range for abnormal luminescence, and has weak applicability.
Therefore, how to quickly and effectively implement detection of abnormal light emission of an ONU is a problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to overcome the defects of the background technology, and provides an uplink data transmission method, an abnormal light emission detection method, equipment and a system, which solve the problem of randomness of influence of abnormal light emission on other ONUs, can rapidly and effectively detect various different types of abnormal light emission, and have wide detection range and strong applicability, thereby meeting the actual application demands.
To achieve the above objective, in a first aspect, an embodiment of the present invention provides an uplink data transmission method, which is applied to a passive optical network, where the passive optical network includes an OLT, and the OLT communicates with at least one ONU through an optical splitter. The uplink data transmission method comprises the following steps:
each ONU receives an uplink bandwidth time slot distributed by the OLT;
each ONU emits light and transmits uplink service in the corresponding uplink bandwidth time slot according to the received uplink bandwidth time slot to form an uplink burst; and transmits the pseudo-random code in a non-upstream bandwidth slot.
In a second aspect, an embodiment of the present invention further provides an abnormal light emission detection method, which is applied to a passive optical network, where the passive optical network includes an OLT, and the OLT communicates with at least one ONU through an optical splitter, where the abnormal light emission detection method includes the following steps:
The OLT periodically allocates uplink bandwidth time slots for each ONU; the uplink bandwidth time slots are used for each ONU to emit light according to the corresponding uplink bandwidth time slots and send uplink service to form uplink burst, and pseudo-random codes are sent in non-uplink bandwidth time slots;
the OLT receives uplink burst data sent by each ONU and judges whether all uplink bursts can be successfully delimited; when the delimitation failure is judged to exist, corresponding abnormal luminescence detection is carried out according to different delimitation failure conditions by taking an uplink burst as a unit, and whether the delimitation failure is caused by abnormal luminescence or not is determined; and positioning the abnormal light-emitting ONU.
As a preferred embodiment, the OLT receives upstream burst data sent by each ONU, and determines whether all upstream bursts can be successfully delimited, and specifically includes:
the OLT receives the uplink burst data sent by each ONU and predicts the position where the uplink burst of each ONU will appear according to the allocated uplink bandwidth time slot; and in the position where the predicted uplink burst is about to appear, judging whether all uplink bursts can be successfully delimited by searching the burst delimiter.
As a preferred embodiment, the different delimitation failure situations include the following four:
In the first case, there is one uplink burst or a plurality of continuous uplink burst delimitation failures;
the second case, that has multiple discrete uplink burst delimitation failures occurs at the same time;
in the third case, only one uplink burst is successfully delimited, and all other uplink bursts fail in delimitation;
and in the fourth case, all uplink bursts of the registered ONU fail to be delimited.
As a preferred embodiment, if the situation of the delimitation failure is the first situation, performing corresponding abnormal light emission detection according to the situation of the delimitation failure, and determining whether the delimitation failure is caused by abnormal light emission, specifically including the following operations:
the number of bursts of recording delimitation failure is M; using the first successfully delimited uplink burst before the delimitation failure as a starting point, carrying out abnormal luminescence detection according to the detection range of M+1 uplink bursts, and judging whether light exists in the detection range all the time; if there is always light, it is determined that the delimitation failure is caused by abnormal light emission.
As a preferred embodiment, if the situation of the delimitation failure is the second situation, performing corresponding abnormal light emission detection according to the situation of the delimitation failure, and determining whether the delimitation failure is caused by abnormal light emission, specifically including the following operations:
carrying out abnormal luminescence detection on each discrete uplink burst delimitation failure in sequence, and determining whether each discrete uplink burst delimitation failure is caused by abnormal luminescence or not; recording the number of bursts with the delimitation failure as M when carrying out abnormal luminescence detection each time, carrying out abnormal luminescence detection according to the detection range as M+1 uplink bursts by taking the uplink burst with the first delimitation success before the delimitation failure as a starting point, and judging whether light exists in the detection range all the time; if there is always light, it is determined that the delimitation failure is caused by abnormal light emission.
As a preferred embodiment, if the situation of the delimitation failure is the third situation, performing corresponding abnormal light emission detection according to the situation of the delimitation failure, and determining whether the delimitation failure is caused by abnormal light emission, specifically including the following operations:
recording the total number of registered ONUs as N; using the successfully delimited uplink burst as a starting point, carrying out abnormal luminescence detection according to the uplink burst with the detection range of N+1, and judging whether light exists in the detection range all the time; if there is always light, it is determined that one ONU is emitting long light.
As a preferred embodiment, if the situation of the delimitation failure is the fourth situation, performing corresponding abnormal light emission detection according to the situation of the delimitation failure, and determining whether the delimitation failure is caused by abnormal light emission, specifically including the following operations:
recording the total number of registered ONUs as N; detecting abnormal light emission according to the uplink burst with the detection range of n+1 uplink bursts by taking any uplink burst as a starting point, and judging whether light exists in the detection range all the time; if there is always light, it is determined that there is an unregistered ONU or that a plurality of registered ONUs are emitting light for a long time.
As a preferred embodiment, the positioning of the ONU with abnormal light emission specifically includes the following operations:
If the situation of the delimitation failure is the case one, and the delimitation failure is determined to be caused by abnormal light emission, positioning the ONU which is successfully delimited by the first ONU before the delimitation failure as the abnormal light emission ONU;
if the situation of the delimitation failure is the second situation and the delimitation failure is determined to be caused by abnormal light emission, positioning the ONU which corresponds to the first successful delimitation before the delimitation failure as the abnormal light emission ONU;
if the situation of the delimitation failure is the third situation and the delimitation failure is determined to be caused by abnormal light emission, positioning the ONU with the successful unique delimitation as the abnormal light emission ONU;
if the situation of the delimitation failure is the fourth situation and the delimitation failure is caused by abnormal light emission, judging that an unregistered ONU or a plurality of registered ONUs emit long light.
In a third aspect, an embodiment of the present invention further provides an ONU device based on the method in the embodiment of the first aspect, where the ONU device includes a timeslot receiving module and a sending processing module;
the time slot receiving module is configured to: receiving an uplink bandwidth time slot distributed by an OLT;
the sending processing module is configured to: according to the received uplink bandwidth time slots, emitting light in the corresponding uplink bandwidth time slots and sending uplink services to form uplink bursts; and transmits the pseudo-random code in a non-upstream bandwidth slot.
As a preferred embodiment, the transmission processing module includes a slot range generation sub-module, a pseudo-random code generation sub-module, a data synthesis sub-module, and a laser transmission sub-module;
the time slot range generation submodule is used for: according to the uplink bandwidth time slot distributed by the OLT, determining the effective time range of the ONU capable of transmitting the service, generating an opening indication to control the laser transmitting submodule to open light in the effective time range and transmit the uplink service to form an uplink burst;
the pseudo-random code generation sub-module is used for: generating a pseudo-random code transmitted in a non-upstream bandwidth time slot;
the data synthesis submodule is used for: according to the transmission mode of transmitting pseudo-random codes in the uplink bandwidth time slots, generating corresponding transmission data for the laser transmission submodule to transmit;
the laser sending submodule is used for: and transmitting the transmission data to the OLT.
In a fourth aspect, an embodiment of the present invention further provides an OLT apparatus based on the method in the embodiment of the second aspect, where the OLT apparatus includes a slot allocation module and a detection processing module;
the time slot allocation module is configured to: periodically distributing uplink bandwidth time slots for each ONU; the uplink bandwidth time slots are used for each ONU to emit light according to the corresponding uplink bandwidth time slots and send uplink service to form uplink burst, and pseudo-random codes are sent in non-uplink bandwidth time slots;
The detection processing module is used for: receiving uplink burst data sent by each ONU, and judging whether all uplink bursts can be delimited successfully or not; when the delimitation failure is judged to exist, corresponding abnormal luminescence detection is carried out according to different delimitation failure conditions by taking an uplink burst as a unit, and whether the delimitation failure is caused by abnormal luminescence or not is determined; and positioning the abnormal light-emitting ONU.
As a preferred embodiment, the detection processing module includes a laser receiving sub-module, an uplink burst prediction sub-module, a delimitation failure judging sub-module and an abnormal light emitting detection sub-module;
the laser receiving sub-module is used for: receiving uplink burst data sent from an ONU, and generating a received optical signal and received data;
the uplink burst prediction submodule is used for: predicting the position where the uplink burst of each ONU will appear according to the allocated uplink bandwidth time slot, and generating an uplink burst prediction range indication signal;
the delimitation failure judging sub-module is used for: searching a burst delimiter in an uplink burst prediction range according to the uplink burst prediction range indication signal, and judging whether all uplink bursts can be delimited successfully;
The abnormal light emitting detection submodule is used for: when the delimitation failure is judged to exist, corresponding abnormal luminescence detection is carried out according to different delimitation failure conditions by taking an uplink burst as a unit, and whether the delimitation failure is caused by abnormal luminescence or not is determined; and positioning the abnormal light-emitting ONU.
In a fifth aspect, an embodiment of the present invention further provides an abnormal light emitting detection system, where the system includes an OLT apparatus according to an embodiment of the fourth aspect, and at least one ONU apparatus according to an embodiment of the third aspect.
The invention has the beneficial effects that:
(1) In the invention, each ONU is designed to be a transmission mode for transmitting uplink service in an uplink bandwidth time slot and transmitting pseudo random code in a non-uplink bandwidth time slot. Because the ONU transmits the pseudo-random code in the non-uplink bandwidth time slot, the influence of abnormal light emission on other ONUs can be aggravated, so that the affected ONUs can definitely have delimitation failure, and the problem of randomness of the influence of the abnormal light emission on other ONUs is solved.
(2) In the invention, the OLT is also designed to detect abnormal luminescence by taking the uplink burst as a unit, and corresponding detection analysis can be carried out according to different delimitation failure conditions, so that whether light exists all the time among a plurality of continuous ONU uplink bursts can be easily judged, the detection mode is more flexible and convenient, and the abnormal luminescence of a plurality of different types can be rapidly and effectively detected, so that the detection efficiency is high, the detection range is wide, the applicability is strong, and the actual application requirements are met.
Drawings
Fig. 1 is a flowchart of an uplink data transmission method in an embodiment of the present invention;
fig. 2 is a schematic diagram of ONU transmitting data when the ONU normally emits light in the embodiment of the present invention;
fig. 3 is a schematic diagram of ONU transmitting data when an ONU emits light abnormally in an embodiment of the present invention;
FIG. 4 is a flowchart of an abnormal light emission detection method according to an embodiment of the present invention;
fig. 5 is a schematic diagram of OLT receiving data when an ONU normally emits light in an embodiment of the present invention;
fig. 6 is a schematic diagram of OLT receiving data when an ONU in an embodiment of the present invention is abnormally emitting light;
fig. 7 is a schematic diagram showing abnormal light emission in an example of 10 ONUs;
fig. 8 is a block diagram of an ONU device according to an embodiment of the present invention;
fig. 9 is a block diagram of an OLT apparatus according to an embodiment of the present invention;
fig. 10 is a block diagram of an abnormal light emitting detection system according to an embodiment of the present invention.
Detailed Description
Aiming at the problem of randomness of the abnormality of the affected ONU in the prior art, the abnormal luminescence is difficult to locate and recover. In addition, the traditional ONU abnormal light emission detection method has the problems of low detection efficiency, narrow detection range, low applicability and the like. The invention aims to provide an uplink data transmission method, an abnormal light emission detection method, equipment and a system, which can solve the problem of randomness of influence of abnormal light emission on other ONUs, can further realize rapid and effective detection of various different types of abnormal light emission while solving the problem, and has the advantages of high detection efficiency, wide detection range and strong applicability, thereby meeting the actual application demands.
The main design thought is as follows:
providing an uplink data transmission method, wherein each ONU emits light and transmits uplink service in the corresponding uplink bandwidth time slot according to the uplink bandwidth time slot allocated by the OLT to form an uplink burst; and transmits the pseudo-random code in a non-upstream bandwidth slot. In the method, because the ONU transmits the pseudo-random code in the non-uplink bandwidth time slot, the influence of abnormal light emission on other ONUs can be aggravated, so that the affected ONUs can definitely generate delimitation failure, and the problem of randomness of the influence of the abnormal light emission on other ONUs is solved.
The OLT periodically allocates uplink bandwidth time slots for each ONU; the uplink bandwidth time slots are used for each ONU to emit light according to the corresponding uplink bandwidth time slots and send uplink service to form uplink burst, and pseudo-random codes are sent in non-uplink bandwidth time slots; the OLT receives uplink burst data sent by each ONU and judges whether all uplink bursts can be successfully delimited; when the delimitation failure is judged to exist, corresponding abnormal luminescence detection is carried out according to different delimitation failure conditions by taking an uplink burst as a unit, and whether the delimitation failure is caused by abnormal luminescence or not is determined; and positioning the abnormal light-emitting ONU. According to the abnormal light emission detection method, on the basis of solving the randomness problem of the influence of abnormal light emission on other ONUs, the abnormal light emission detection can be carried out by taking the uplink burst as a unit, corresponding detection analysis can be carried out according to different delimitation failure conditions, whether light exists all the time among a plurality of continuous ONUs uplink bursts can be judged easily, the detection mode is more flexible and convenient, various different types of abnormal light emission can be detected rapidly and effectively, the detection efficiency is high, the detection range is wide, the applicability is strong, and the practical application requirements are met.
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the technical solutions of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
However, it should be noted that: the examples to be presented below are only a few specific examples and are not intended to limit the embodiments of the present invention to the following specific steps, values, conditions, data, sequences, etc. Those skilled in the art can, upon reading the present specification, make and use the concepts of the invention to construct further embodiments not mentioned in the specification.
Example 1
The embodiment provides an uplink data transmission method, which is applied to a passive optical network, wherein the passive optical network comprises an OLT, and the OLT is communicated with at least one ONU through an optical splitter. Specifically, referring to fig. 1, the uplink data transmission method of the present embodiment includes the following steps:
a1, each ONU receives an uplink bandwidth time slot distributed by an OLT;
a2, each ONU emits light in the corresponding uplink bandwidth time slot according to the received uplink bandwidth time slot and transmits uplink service to form an uplink burst; and transmits the pseudo-random code in a non-upstream bandwidth slot.
It can be understood that in the prior art, an ONU does not send any information in a non-uplink bandwidth slot, and only affects the light intensity of other ONUs when the ONU emits light abnormally. When the light intensity of abnormal light emission is larger, the influence on other ONUs is larger, and the affected ONUs are abnormal due to wrong delimitation; when the light intensity of the abnormal light is smaller, the influence on other ONU is smaller, and even the normal operation of other ONU is not influenced. Therefore, there is a problem of randomness of the abnormality of the affected ONU, resulting in difficulty in locating and recovering abnormal light emission. In this embodiment, in order to solve the problem of the abnormal randomness of the affected ONU, the ONU side is specifically designed to transmit the upstream traffic in the upstream bandwidth time slot, and transmit the pseudo-random code in the non-upstream bandwidth time slot. Because the ONU transmits the pseudo-random code in the non-uplink bandwidth time slot, the influence of abnormal light emission on other ONUs can be aggravated, so that the affected ONUs can have delimitation errors, and the problem of randomness of the influence of the abnormal light emission on the other ONUs is solved.
In order to better understand the design principle of the ONU side in this embodiment, the following specific examples are illustrated with reference to the accompanying drawings:
referring to fig. 2, a schematic diagram of ONU transmitting data when the ONU emits light normally in this embodiment is shown. In fig. 2, an ONU transmits upstream traffic (i.e., upstream burst data) in an upstream bandwidth slot and a pseudorandom code in a non-upstream bandwidth slot. Although there is a pseudorandom code transmitted in the non-upstream bandwidth time slot, the pseudorandom code cannot be successfully transmitted to the OLT because the ONU is not on in the non-upstream bandwidth time slot. Therefore, under the condition that the ONU emits light normally, the transmission of the pseudo random code does not cause any influence on the data transmission of other ONUs and the data reception of the OLT.
Referring to fig. 3, a schematic diagram of ONU transmission data when the ONU emits light abnormally in the present embodiment is shown. In fig. 3, the ONU will also transmit upstream traffic (i.e., upstream burst data) in upstream bandwidth slots and pseudo-random codes in non-upstream bandwidth slots. However, because the ONU is abnormal in light-on (i.e. the ONU emits light abnormally), the pseudo-random code in the non-upstream bandwidth time slot is successfully sent out (as shown by the dotted line corresponding part in fig. 3), and conflicts with upstream bursts of other ONUs, so that other ONUs fail to delimit, and further the affected ONUs must have a delimitation error, thereby solving the randomness problem of the influence of abnormal light emission on other ONUs. It is understood that the extent of the influence of an abnormally illuminated ONU on other ONUs is related to the severity of the on-state abnormality of the abnormally illuminated ONU. When the switching abnormality is light, only the first ONU behind can be affected; but when the on-light is abnormally heavy, all ONUs except itself may be affected. Therefore, when the OLT detects the abnormal light emission, it is necessary to define different detection ranges according to different delimitation failure conditions, and further locate the ONU with abnormal light emission.
Illustratively, as an alternative embodiment, step A2 may specifically include the following operations: each ONU determines the effective time range of the ONU capable of transmitting the service according to the uplink bandwidth time slot distributed by the OLT, and controls the laser of the ONU to switch light in the time range, so that the uplink service is transmitted in the time range to form an uplink burst; and, outside the determined effective time range (i.e. non-uplink bandwidth time slot), the pseudo-random code generated by itself is transmitted as transmission data.
Example two
Based on the same inventive concept, the embodiment of the invention also provides an abnormal light emitting detection method which is also applied to a passive optical network, wherein the passive optical network comprises an OLT, and the OLT is communicated with at least one ONU through an optical splitter. Specifically, referring to fig. 4, the abnormal light emission detection method of the present embodiment includes the steps of:
step B1, the OLT periodically allocates uplink bandwidth time slots for each ONU; and the uplink bandwidth time slots are used for all ONU to emit light according to the corresponding uplink bandwidth time slots and send uplink service to form uplink burst, and pseudo random codes are sent in non-uplink bandwidth time slots.
In practical application, the allocation sequence of the uplink bandwidth time slots may be determined by the sequence in which the ONUs complete registration. For example: the current passive optical network comprises three ONUs, namely ONU1, ONU2 and ONU3. Assuming that ONU2 completes registration first, then ONU3, and ONU1 completes registration last, when the OLT periodically allocates an upstream bandwidth slot, the OLT may allocate the upstream bandwidth slot for ONU2 first, then allocate the upstream bandwidth slot for ONU3, and finally allocate the upstream bandwidth slot for ONU 1. The allocation mode can most effectively improve the allocation efficiency of the uplink bandwidth time slots and avoid the problems of allocation delay and the like.
Step B2, the OLT receives uplink burst data sent by each ONU and judges whether all uplink bursts can be successfully delimited; when the delimitation failure is judged to exist, corresponding abnormal luminescence detection is carried out according to different delimitation failure conditions by taking an uplink burst as a unit, and whether the delimitation failure is caused by abnormal luminescence or not is determined; and positioning the abnormal light-emitting ONU.
It can be understood that, in this embodiment, when each ONU emits light normally, the OLT can receive the upstream data of all ONUs normally, and the upstream bursts of each ONU do not interfere with each other; however, when an ONU emits light abnormally, the ONU transmits a pseudo-random code in a non-upstream bandwidth time slot, and the random code collides with upstream bursts of other ONUs, so that the OLT fails to delimit when receiving the upstream bursts of other ONUs.
For example, referring to fig. 5, a schematic diagram of OLT receiving data when ONU normally emits light in this embodiment is shown. In fig. 5, in one allocation period, three different ONUs emit light normally, uplink burst data sent by the three ONUs do not interfere with each other, and the OLT can receive uplink data of all ONUs normally. Referring to fig. 6, a schematic diagram of OLT receiving data when an ONU is abnormally lighted in the present embodiment is shown. In fig. 6, in one allocation period, ONU2 emits light abnormally, and its pseudo-random code is sent out in the following non-upstream bandwidth time slot and collides with the upstream burst of ONU3, so that the data of ONU3 received by the OLT is misdelimited.
In practical application, as a preferred implementation manner, in step B2, the OLT receives the uplink burst data sent by each ONU, and determines whether all uplink bursts can be successfully delimited, which specifically includes the following operations:
(1) The OLT receives the uplink burst data sent by each ONU and predicts the position where the uplink burst of each ONU will appear according to the allocated uplink bandwidth time slot;
(2) And in the position where the predicted uplink burst is about to appear, judging whether all uplink bursts can be successfully delimited by searching the burst delimiter. It can be understood that if all ONUs are successfully delimited, it is indicated that no ONU is abnormally lighted; if there is an ONU that has failed delimitation, further abnormal light emission detection is required to determine whether the delimitation failure is caused by abnormal light emission.
Further, when it is determined that the delimitation failure occurs, it is necessary to detect abnormal light emission. In the prior art, the OLT detects abnormal light emission in time units, but due to the randomness of the uplink bandwidth time slot size of the ONU, the control time cannot accurately detect the abnormal light emission range, and only can detect one abnormal light emission condition of long light emission, so that the positioning of the rogue ONU is weak. In this embodiment, the OLT performs abnormal light emission detection by using the uplink burst as a unit, and performs corresponding detection analysis according to different delimiting failure conditions, so that whether light exists all the time between a plurality of consecutive ONU uplink bursts can be easily determined, the detection mode is more flexible and convenient, multiple different types of abnormal light emission can be rapidly and effectively detected, and the detection range of the abnormal ONU is greatly expanded.
Specifically, as an alternative embodiment, in step B2, the different delimiting failure situations include the following four cases:
in the first case, there is one uplink burst or a plurality of continuous uplink burst delimitation failures;
the second case, that has multiple discrete uplink burst delimitation failures occurs at the same time;
in the third case, only one uplink burst is successfully delimited, and all other uplink bursts fail in delimitation;
and in the fourth case, all uplink bursts of the registered ONU fail to be delimited.
On this basis, as an optional implementation manner, in step B2, corresponding abnormal light emission detection is performed according to different delimitation failure conditions, and whether delimitation failure is caused by abnormal light emission is determined, which specifically includes the following operations:
1) If the situation of delimitation failure is the first situation, namely that one uplink burst or a plurality of continuous uplink bursts are delimitation failure, recording the number of the bursts of delimitation failure as M, and carrying out abnormal luminescence detection according to the detection range as M+1 uplink bursts by taking the uplink burst of which the first delimitation is successful before delimitation failure as a starting point, wherein the abnormal luminescence detection method is to judge whether light exists in the detection range all the time; if light is always available, determining that the delimitation failure is caused by abnormal light emission; if there is not always light, it is determined that the delimitation failure is due to other reasons.
2) If the delimitation failure condition is a second condition, namely that a plurality of discrete uplink burst delimitation failures occur simultaneously, carrying out abnormal luminescence detection on each discrete uplink burst delimitation failure in sequence according to a first condition mode, determining whether each discrete uplink burst delimitation failure is caused by abnormal luminescence or not, and realizing detection on abnormal luminescence of a plurality of ONUs simultaneously.
3) If the situation of delimitation failure is the third situation, namely that only one uplink burst is successfully delimited and the rest uplink bursts are all delimitation failure, recording the total number of registered ONUs as N, and carrying out abnormal luminescence detection according to the uplink bursts with the successfully delimited uplink bursts as a starting point and the detection range as n+1 uplink bursts, wherein the abnormal luminescence detection method is to judge whether light exists in the detection range all the time; if the light exists all the time, determining that one ONU emits long light (whether the delimitation failure is caused by abnormal light emission or not can be determined); if there is not always light, it is determined that the delimitation failure is due to other reasons.
4) If the situation of delimitation failure is the situation four, namely that all uplink bursts of the registered ONU are delimitation failure, recording the total number of the registered ONU as N, and carrying out abnormal luminescence detection according to the detection range as N+1 uplink bursts by taking any uplink burst as a starting point, wherein the abnormal luminescence detection method is to judge whether light exists in the detection range; if the light exists all the time, determining that an unregistered ONU exists or a plurality of registered ONUs emit long light (whether the delimitation failure is caused by abnormal light emission or not can be determined); if there is not always light, it is determined that the delimitation failure is due to other reasons.
Further, as an optional implementation manner, in step B2, positioning the ONU with abnormal light emission specifically includes the following operations:
1) If the situation of the delimitation failure is the first situation, namely that there is one uplink burst or a plurality of continuous uplink bursts, and the delimitation failure is determined to be caused by abnormal light emission through abnormal light emission detection, the ONU which is successfully delimited by the first time before the delimitation failure is positioned as the abnormal light emission ONU.
2) If the delimitation failure condition is a second condition, that is, a plurality of discrete uplink burst delimitation failures occur simultaneously, and it is determined through abnormal light emission detection that one or more delimitation failures are caused by abnormal light emission (that is, whether the delimitation failure is caused by abnormal light emission or not can be determined), the ONU which is successfully delimited by the first time before the corresponding delimitation failure is positioned as the abnormal light emission ONU.
3) If the situation of delimitation failure is the third situation, namely that only one uplink burst is successfully delimited, the other uplink bursts are all delimitated and fail, and it is determined that one ONU emits long light through abnormal light emission detection (namely, whether the delimitation failure is caused by abnormal light emission or not can be determined), the ONU with the successful unique delimitation is positioned as the abnormal light emission ONU.
4) If the situation of the delimitation failure is the fourth situation, that is, all uplink bursts of the registered ONUs are delimitation failure, and it is determined that long luminescence exists through abnormal luminescence detection (that is, whether the delimitation failure is caused by abnormal luminescence or not can be determined), it is determined that long luminescence occurs in an unregistered ONU or a plurality of registered ONUs, but it is impossible to specifically locate which ONU emits long luminescence.
Illustratively, a passive optical network including 10 ONUs will be specifically described. Assuming that the abnormal light emitting situation of 10 ONUs is shown in fig. 7, performing corresponding abnormal light emitting detection according to the delimitation failure situation shown in fig. 7, and positioning and fault recovery of the abnormal light emitting ONUs, the method specifically comprises the following steps:
step 1, as shown in fig. 7, delimitation detection is performed in the predicted uplink burst range, and two discrete continuous uplink burst delimitation failures are found to exist: one of them presents continuous uplink burst delimitation failure (corresponding data collision part in fig. 7) for ONU3 and ONU4, and the other presents continuous uplink burst delimitation failure (corresponding data collision part in fig. 7) for ONU7, ONU8 and ONU 9;
step 2, because ONU3 and ONU4 are consecutive two delimitation failures and ONU7, ONU8 and ONU9 are consecutive three delimitation failures, it is necessary to sequentially perform abnormal light emission detection on the two discrete consecutive uplink burst delimitation failures to determine whether the two consecutive delimitation failures are caused by abnormal light emission, respectively:
firstly, using ONU2 as a starting point, carrying out abnormal luminescence detection according to uplink bursts with a detection range of 2+1, wherein the detection method is to judge whether light exists among three bursts of ONU2, ONU3 and ONU4 all the time; if the light exists all the time, determining that the delimitation failure is caused by abnormal light emission, and positioning the ONU2 as the ONU with the abnormal light emission;
Secondly, using ONU6 as a starting point, and detecting abnormal luminescence according to the uplink burst with the detection range of 3+1, wherein the detection method is to judge whether light exists among four bursts of ONU6, ONU7, ONU8 and ONU 9; if the light exists all the time, determining that the delimitation failure is caused by abnormal light emission, and positioning the ONU6 to be the ONU with the abnormal light emission;
step 3, removing the ONU2 and the ONU6 from the network to realize the rapid recovery of the passive optical network; and after the abnormal light emitting reasons of the ONU2 and the ONU6 are found and solved, adding the ONU2 and the ONU6 into the passive optical network.
As can be seen from the above operation, in the abnormal light emission detection method of the present embodiment, when each ONU emits light normally, the OLT can receive the uplink data of all ONUs normally, and uplink bursts of each ONU do not interfere with each other; however, when an ONU emits light abnormally, the ONU transmits a pseudo-random code in a non-upstream bandwidth time slot, and the random code collides with upstream bursts of other ONUs, so that the OLT inevitably fails to delimit the upstream bursts of other ONUs when receiving the upstream bursts of other ONUs, thereby solving the problem of randomness of influence of abnormal light emission on other ONUs. In addition, in this embodiment, the OLT performs abnormal light emission detection by using the uplink burst as a unit, and can perform corresponding detection analysis according to different delimiting failure conditions, so that whether light exists all the time between a plurality of continuous ONU uplink bursts can be easily judged, the detection mode is more flexible and convenient, and multiple different types of abnormal light emission can be rapidly and effectively detected, so that the detection efficiency is high, the detection range is wide, the applicability is strong, and the actual application requirements are satisfied.
Example III
Based on the same inventive concept, the embodiment of the present invention also provides an ONU device based on the uplink data transmission method of the first embodiment. Referring to fig. 8, the ONU apparatus includes: and the time slot receiving module and the sending processing module. Wherein, the time slot receiving module is used for: and receiving the uplink bandwidth time slot allocated by the OLT. The sending processing module is configured to: according to the uplink bandwidth time slots distributed by the OLT, emitting light in the corresponding uplink bandwidth time slots and transmitting uplink services to form uplink bursts; and transmits the pseudo-random code in a non-upstream bandwidth slot.
Further, as a preferred embodiment, as shown in fig. 8, the transmission processing module includes a slot range generation sub-module, a pseudo random code generation sub-module, a data synthesis sub-module, and a laser transmission sub-module.
Wherein, the time slot range generates submodule for: and determining the effective time range of the ONU capable of transmitting the service according to the uplink bandwidth time slot distributed by the OLT, generating an on-state indication to control the laser transmitting submodule to start light in the effective time range and transmit the uplink service to form an uplink burst. A pseudo-random code generation sub-module for: a pseudo-random code is generated that is transmitted in a non-upstream bandwidth slot. A data synthesis submodule for: and generating corresponding transmission data for the laser transmission submodule to transmit according to the transmission mode of transmitting the pseudo-random code in the uplink bandwidth time slot and the non-uplink bandwidth time slot. A laser transmitting sub-module for: and transmitting the transmission data to the OLT.
In addition, it should be noted that, various modifications and specific examples in the foregoing embodiments of the uplink data transmission method are equally applicable to the ONU device of the present embodiment, and those skilled in the art can clearly know the implementation method of the ONU device of the present embodiment through the foregoing detailed description of the method, so that, for brevity of description, they will not be described in detail herein.
Example IV
Based on the same inventive concept, the embodiment of the invention also provides an OLT apparatus based on the abnormal light emitting detection method of the second embodiment. Referring to fig. 9, the OLT apparatus includes: the device comprises a time slot allocation module and a detection processing module. Wherein, the time slot allocation module is used for: periodically distributing uplink bandwidth time slots for each ONU; and the uplink bandwidth time slots are used for all ONU to emit light according to the corresponding uplink bandwidth time slots and send uplink service to form uplink burst, and pseudo random codes are sent in non-uplink bandwidth time slots. The detection processing module is used for: receiving uplink burst data sent by each ONU, and judging whether all uplink bursts can be delimited successfully or not; when the delimitation failure is judged to exist, corresponding abnormal luminescence detection is carried out according to different delimitation failure conditions by taking an uplink burst as a unit, and whether the delimitation failure is caused by abnormal luminescence or not is determined; and positioning the abnormal light-emitting ONU.
Further, as a preferred embodiment, as shown in fig. 9, the detection processing module includes: the device comprises a laser receiving sub-module, an uplink burst prediction sub-module, a delimitation failure judging sub-module and an abnormal light emitting detection sub-module.
Wherein, the laser receives submodule, is used for: and receiving the uplink burst data sent from the ONU to generate a received optical signal and received data. An uplink burst prediction submodule, configured to: and predicting the position where the uplink burst of each ONU will appear according to the allocated uplink bandwidth time slot, and generating an uplink burst prediction range indication signal. A delimitation failure judging sub-module for: and searching a burst delimiter in the uplink burst prediction range according to the uplink burst prediction range indication signal, and judging whether all uplink bursts can be delimited successfully. An abnormal light emission detection sub-module for: when the delimitation failure is judged to exist, corresponding abnormal luminescence detection is carried out according to different delimitation failure conditions by taking an uplink burst as a unit, and whether the delimitation failure is caused by abnormal luminescence or not is determined; and positioning the abnormal light-emitting ONU.
It should also be noted that, the various modifications and specific examples in the foregoing embodiment of the abnormal light emission detection method are equally applicable to the OLT apparatus of the present embodiment, and those skilled in the art will be able to clearly know the implementation method of the OLT apparatus of the present embodiment through the foregoing detailed description of the method, so that, for brevity of description, they will not be described in detail herein.
Example five
Referring to fig. 10, based on the same inventive concept, an embodiment of the present invention further provides an abnormal light emitting detection system, which includes the OLT apparatus of the fourth embodiment and at least one ONU apparatus of the third embodiment.
Note that: the particular embodiments described above are illustrative only and not restrictive, and those skilled in the art may combine and combine steps and means from the various embodiments described above separately to achieve the benefits of the present invention in accordance with the concepts of the present invention, such combined and combined embodiments also being encompassed by the present invention, such combination and combination not being described in detail herein.
The advantages, effects, etc. mentioned in the embodiments of the present invention are merely examples, and are not to be construed as necessarily limiting the various embodiments of the present invention. In addition, the foregoing specific details of the embodiments of the invention have been disclosed for purposes of illustration and understanding only, and are not intended to be limiting, since the embodiments of the invention must not be practiced with the specific details.
The block diagrams of the devices, apparatuses, devices, systems according to the embodiments of the present invention are merely illustrative examples, and are not intended to require or imply that connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, apparatuses, devices, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used in embodiments of the present invention refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used in embodiments of the present invention refers to, and is used interchangeably with, the phrase "such as, but not limited to.
The step flow diagrams in the embodiments of the invention and the method descriptions above are merely illustrative examples and are not intended to require or imply that the steps of the various embodiments must be performed in the order presented. The order of steps in the above embodiments may be performed in any order, as will be appreciated by those skilled in the art. Words such as "thereafter," "then," "next," and the like are not intended to limit the order of the steps; these words are simply used to guide the reader through the description of these methods. Furthermore, any reference to an element in the singular, for example, using the articles "a," "an," or "the," is not to be construed as limiting the element to the singular.
In addition, the steps and means in the various embodiments of the present invention are not limited to practice in a certain embodiment, and indeed, the relevant partial steps and partial means in the various embodiments herein may be combined according to the concept of the present invention to contemplate new embodiments, which are also included in the scope of the present invention.
The operations of embodiments of the present invention may be performed by any suitable means capable of performing the corresponding functions. The means may include various hardware and/or software components and/or modules including, but not limited to, circuitry or a processor of the hardware.
The method of an embodiment of the invention includes one or more acts for implementing the method described above. The methods and/or acts may be interchanged with one another without departing from the scope of the claims. In other words, unless a specific order of acts is specified, the order and/or use of specific acts may be modified without departing from the scope of the claims.
The functions of the embodiments of the present invention may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored as one or more instructions on a tangible computer-readable medium. A storage media may be any available tangible media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other tangible medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. As used herein, discs (disks) and disks include Compact Disks (CDs), laser disks, optical disks, DVDs (Digital Versatile Disc, digital versatile disks), floppy disks, and blu-ray disks where disks reproduce data magnetically, while disks reproduce data optically with lasers.
Thus, the computer program product may perform the operations presented herein. For example, such a computer program product may be a computer-readable tangible medium having instructions tangibly stored (and/or encoded) thereon, the instructions being executable by one or more processors to perform the operations described herein. The computer program product may comprise packaged material.
Other examples and implementations are within the scope and spirit of embodiments of the invention and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired or any combination of these. Features that implement the functions may also be physically located at various locations including being distributed such that portions of the functions are implemented at different physical locations.
Various changes, substitutions, and alterations to the techniques described herein may be made by those skilled in the art without departing from the teachings as defined by the appended claims. Furthermore, the scope of the claims of the present disclosure is not limited to the particular aspects of the process, machine, manufacture, composition of matter, means, methods and acts described above. The processes, machines, manufacture, compositions of matter, means, methods, or acts, presently existing or later to be developed that perform substantially the same function or achieve substantially the same result as the corresponding aspects described herein may be utilized. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or acts.
The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the invention. Thus, the present invention is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit embodiments of the invention to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof. And what is not described in detail in this specification is prior art known to those skilled in the art.
Claims (14)
1. The uplink data transmission method is applied to a passive optical network, the passive optical network comprises an OLT, and the OLT is communicated with at least one ONU through an optical splitter, and is characterized by comprising the following steps:
Each ONU receives an uplink bandwidth time slot distributed by the OLT;
each ONU emits light and transmits uplink service in the corresponding uplink bandwidth time slot according to the received uplink bandwidth time slot to form an uplink burst; and transmitting a pseudo-random code in a non-uplink bandwidth time slot, wherein the pseudo-random code is used for exacerbating the influence of abnormal light emission on other ONUs, so that the affected ONUs have a delimitation error.
2. The abnormal light emitting detection method is applied to a passive optical network, wherein the passive optical network comprises an OLT, and the OLT is communicated with at least one ONU through an optical splitter, and is characterized by comprising the following steps:
the OLT periodically allocates uplink bandwidth time slots for each ONU; the uplink bandwidth time slots are used for each ONU to emit light according to the corresponding uplink bandwidth time slots and send uplink service to form uplink burst, and pseudo-random codes are sent in non-uplink bandwidth time slots;
the OLT receives uplink burst data sent by each ONU and judges whether all uplink bursts can be successfully delimited; when the delimitation failure is judged to exist, corresponding abnormal luminescence detection is carried out according to different delimitation failure conditions by taking an uplink burst as a unit, and whether the delimitation failure is caused by abnormal luminescence or not is determined; and positioning the abnormal light-emitting ONU.
3. The abnormal light emitting detection method of claim 2, wherein the OLT receives uplink burst data sent by each ONU and determines whether all uplink bursts can be successfully delimited, and specifically comprises:
the OLT receives the uplink burst data sent by each ONU and predicts the position where the uplink burst of each ONU will appear according to the allocated uplink bandwidth time slot;
and in the position where the predicted uplink burst is about to appear, judging whether all uplink bursts can be successfully delimited by searching the burst delimiter.
4. The abnormal light detection method of claim 2, wherein the different delimiting failure conditions include four of:
in the first case, there is one uplink burst or a plurality of continuous uplink burst delimitation failures;
the second case, that has multiple discrete uplink burst delimitation failures occurs at the same time;
in the third case, only one uplink burst is successfully delimited, and all other uplink bursts fail in delimitation;
and in the fourth case, all uplink bursts of the registered ONU fail to be delimited.
5. The abnormal light detection method of claim 4, wherein if the delimitation failure condition is a first case, performing corresponding abnormal light detection according to the delimitation failure condition, and determining whether the delimitation failure is caused by abnormal light, comprises the following operations:
The number of bursts of recording delimitation failure is M;
using the first successfully delimited uplink burst before the delimitation failure as a starting point, carrying out abnormal luminescence detection according to the detection range of M+1 uplink bursts, and judging whether light exists in the detection range all the time;
if there is always light, it is determined that the delimitation failure is caused by abnormal light emission.
6. The abnormal light detection method of claim 4, wherein if the case of the delimitation failure is case two, performing corresponding abnormal light detection according to the case of the delimitation failure, and determining whether the delimitation failure is caused by abnormal light, comprises the following operations:
carrying out abnormal luminescence detection on each discrete uplink burst delimitation failure in sequence, and determining whether each discrete uplink burst delimitation failure is caused by abnormal luminescence or not;
recording the number of bursts with the delimitation failure as M when carrying out abnormal luminescence detection each time, carrying out abnormal luminescence detection according to the detection range as M+1 uplink bursts by taking the uplink burst with the first delimitation success before the delimitation failure as a starting point, and judging whether light exists in the detection range all the time;
if there is always light, it is determined that the delimitation failure is caused by abnormal light emission.
7. The abnormal light detection method of claim 4, wherein if the case of the delimitation failure is case three, performing corresponding abnormal light detection according to the case of the delimitation failure, and determining whether the delimitation failure is caused by abnormal light, comprises the following operations:
Recording the total number of registered ONUs as N;
using the successfully delimited uplink burst as a starting point, carrying out abnormal luminescence detection according to the uplink burst with the detection range of N+1, and judging whether light exists in the detection range all the time;
if there is always light, it is determined that one ONU is emitting long light.
8. The abnormal light detection method of claim 4, wherein if the case of the delimitation failure is case four, performing corresponding abnormal light detection according to the case of the delimitation failure, and determining whether the delimitation failure is caused by abnormal light, comprises the following operations:
recording the total number of registered ONUs as N;
detecting abnormal light emission according to the uplink burst with the detection range of n+1 uplink bursts by taking any uplink burst as a starting point, and judging whether light exists in the detection range all the time;
if there is always light, it is determined that there is an unregistered ONU or that a plurality of registered ONUs are emitting light for a long time.
9. The abnormal light detection method of claim 4, wherein the positioning of the abnormal light ONU specifically comprises the following operations:
if the situation of the delimitation failure is the case one, and the delimitation failure is determined to be caused by abnormal light emission, positioning the ONU which is successfully delimited by the first ONU before the delimitation failure as the abnormal light emission ONU;
If the situation of the delimitation failure is the second situation and the delimitation failure is determined to be caused by abnormal light emission, positioning the ONU which corresponds to the first successful delimitation before the delimitation failure as the abnormal light emission ONU;
if the situation of the delimitation failure is the third situation and the delimitation failure is determined to be caused by abnormal light emission, positioning the ONU with the successful unique delimitation as the abnormal light emission ONU;
if the situation of the delimitation failure is the fourth situation and the delimitation failure is caused by abnormal light emission, judging that an unregistered ONU or a plurality of registered ONUs emit long light.
10. An ONU device based on the method of claim 1, wherein the ONU device comprises a time slot receiving module and a transmission processing module;
the time slot receiving module is configured to: receiving an uplink bandwidth time slot distributed by an OLT;
the sending processing module is configured to: according to the received uplink bandwidth time slots, emitting light in the corresponding uplink bandwidth time slots and sending uplink services to form uplink bursts; and transmitting a pseudo-random code in a non-uplink bandwidth time slot, wherein the pseudo-random code is used for exacerbating the influence of abnormal light emission on other ONUs, so that the affected ONUs have a delimitation error.
11. The ONU apparatus of claim 10 wherein the transmission processing module comprises a slot-range generation sub-module, a pseudo-random code generation sub-module, a data synthesis sub-module, and a laser transmission sub-module;
The time slot range generation submodule is used for: according to the uplink bandwidth time slot distributed by the OLT, determining the effective time range of the ONU capable of transmitting the service, generating an opening indication to control the laser transmitting submodule to open light in the effective time range and transmit the uplink service to form an uplink burst;
the pseudo-random code generation sub-module is used for: generating a pseudo-random code transmitted in a non-upstream bandwidth time slot;
the data synthesis submodule is used for: according to the transmission mode of transmitting pseudo-random codes in the uplink bandwidth time slots, generating corresponding transmission data for the laser transmission submodule to transmit;
the laser sending submodule is used for: and transmitting the transmission data to the OLT.
12. An OLT apparatus based on the method of any one of claims 2 to 9, characterized in that the OLT apparatus comprises a slot allocation module, a detection processing module;
the time slot allocation module is configured to: periodically distributing uplink bandwidth time slots for each ONU; the uplink bandwidth time slots are used for each ONU to emit light according to the corresponding uplink bandwidth time slots and send uplink service to form uplink burst, and pseudo-random codes are sent in non-uplink bandwidth time slots;
The detection processing module is used for: receiving uplink burst data sent by each ONU, and judging whether all uplink bursts can be delimited successfully or not; when the delimitation failure is judged to exist, corresponding abnormal luminescence detection is carried out according to different delimitation failure conditions by taking an uplink burst as a unit, and whether the delimitation failure is caused by abnormal luminescence or not is determined; and positioning the abnormal light-emitting ONU.
13. The OLT apparatus of claim 12, wherein the detection processing module comprises a laser receiving sub-module, an upstream burst prediction sub-module, a delimitation failure determination sub-module, and an abnormal light emission detection sub-module;
the laser receiving sub-module is used for: receiving uplink burst data sent from an ONU, and generating a received optical signal and received data;
the uplink burst prediction submodule is used for: predicting the position where the uplink burst of each ONU will appear according to the allocated uplink bandwidth time slot, and generating an uplink burst prediction range indication signal;
the delimitation failure judging sub-module is used for: searching a burst delimiter in an uplink burst prediction range according to the uplink burst prediction range indication signal, and judging whether all uplink bursts can be delimited successfully;
The abnormal light emitting detection submodule is used for: when the delimitation failure is judged to exist, corresponding abnormal luminescence detection is carried out according to different delimitation failure conditions by taking an uplink burst as a unit, and whether the delimitation failure is caused by abnormal luminescence or not is determined; and positioning the abnormal light-emitting ONU.
14. An abnormal light emission detection system, characterized in that: the system comprises an OLT device according to claim 12 or 13 and at least one ONU device according to claim 10 or 11.
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