CN104811240A - Method and OLT (optical line terminal) for detecting abnormal-lighting ONUs (optical network units) in PON (passive optical network) system - Google Patents
Method and OLT (optical line terminal) for detecting abnormal-lighting ONUs (optical network units) in PON (passive optical network) system Download PDFInfo
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Abstract
The invention relates to a method and an OLT for detecting abnormal-lighting ONUs in a PON system. The method comprises judging whether the increment of CRC (cyclic redundancy check) error messages of an uplink time slot exceeds a set error threshold, and if so, generating CRC error alarming; according to an alarming time and time slot scheduling, determining a time slot corresponding to the alarming time; taking the ONUs corresponding to the corresponding time slot of the alarming time as well as to the neighboring time slots as suspicious abnormal-lighting ONUs; for every suspicious abnormal-lighting ONUs, performing left and right expansion on the corresponding uplink time slot; determining whether the increments of the CRC error messages after or before the expansion are smaller than the set threshold; if the increment led to by the expansion on either of the two sides is smaller than the set threshold, determining that the ONU corresponding to the time slot is abnormal; if the increments led to by the expansions on the two sides exceed the set threshold, determining the ONU corresponding to the time slot is normal. The method and the OLT for detecting the abnormal-lighting ONUs in the PON system can minimize the influence of abnormal-lighting ONU detection on services.
Description
Technical field
The disclosure relates to the broadband access technology of EPON, especially, relate to a kind of detection PON(Passive Optical Network, EPON) abnormal luminous ONU(OpticalNetwork Terminal in system, optical network unit) method and OLT(Optical Line Terminal, optical line terminal).
Background technology
Based on the FTTx(Fiber To The X of PON, (X represents home to intelligent acess, cabinet, curb, building, office)) technology has that user's access rate is high, wide coverage, good QoS(Quality of Service, service quality) ensure the feature of ability and multicast service tenability, high speed Internet access, VoIP(Voice over IP can be supported simultaneously, IP speech), IPTV(Internet Protocol Television, Web TV) etc. multi-service integrated access, realize real " integration of three networks ".In PON scale construction and operation process, the technical characteristic due to its multiple users share upstream bandwidth makes abnormal luminous ONU become the fault of PON operation saliency.Its concrete reason is: PON system adopts TDMA(Time DivisionMultiple Access in the upstream direction, time division multiple access) burst mode, data are sent in the time slot that ONU must distribute at OLT, close laser and not luminous other times planted agent, can normally work with multiple ONU under ensureing PON mouth.But ONU can not send upstream data according to protocol requirement, the transmission of interference or interruption PON system other ONU upstream datas interior, these ONU are called as " abnormal luminous ONU ".
At present, in the process solving abnormal luminous ONU problem in PON system, conventional method is that the mode by opening or turn off ONU optical module laser transmitters power supply one by one carries out diagnosis and detection, but this method can cause the downlink business of normal ONU interrupts completely.
Summary of the invention
The disclosure proposes new technical scheme in view of at least one in above problem.
The disclosure provides a kind of method detecting abnormal luminous ONU in PON system in one, and the impact of the abnormal luminous ONU of detection on business can be reduced to minimum degree by it.
The disclosure provides a kind of OLT on the other hand at it, and the impact of the abnormal luminous ONU of detection on business can be reduced to minimum degree by it.
According to the disclosure, a kind of method detecting abnormal luminous ONU in PON system is provided, comprises:
To judge in the adjustment settings time interval that OLT in PON system distribute by each ONU the CRC(Cyclic Redundancy Check of ascending time slot, cyclic redundancy check (CRC)) whether the increment of error message exceed setting error thresholds respectively, as exceeded, then produce crc error alarm;
Determine the time slot corresponding with the crc error alarm moment according to the scheduling of OLT to time slot in crc error alarm moment and PON system, wherein, each time slot is corresponding with an ONU respectively;
Using the ONU corresponding to the time slot corresponding with the crc error alarm moment and ONU corresponding to the adjacent time slot of the time slot corresponding with the crc error alarm moment all as doubtful abnormal luminous ONU;
For each doubtful abnormal luminous ONU, left and right expansion is carried out respectively to ascending time slot corresponding thereto;
Judge whether the increment being expanded the crc error message of ascending time slot after expanding and before expansion is less than setting threshold;
If because the increment of the crc error message that left side is expanded or right extension causes is less than setting threshold, then determine that the ONU that this is expanded corresponding to time slot is abnormal luminous ONU;
If because the increment of the crc error message that left side is expanded and right extension causes all exceedes setting threshold, then determine that the ONU that this is expanded corresponding to time slot is normal luminous ONU.
In embodiments more of the present disclosure, the method also comprises:
When expanding the ascending time slot corresponding to doubtful abnormal luminous ONU, if do not have enough upstream datas to cause slot portion overlapping, then OLT indicates the doubtful abnormal luminous ONU corresponding with being expanded time slot to send the upstream data of regular length to realize partly overlapping between time slot.
In embodiments more of the present disclosure, when time slot corresponding to doubtful abnormal luminous ONU carries out left and right expansion respectively, the time slot in PON system corresponding to other ONU is not expanded.
According to the disclosure, additionally provide a kind of OLT, comprising:
CRC alarm generation unit, for judge in the adjustment settings time interval that OLT in PON system distribute by each ONU the crc error message of ascending time slot increment whether exceed setting error thresholds respectively, as exceeded, then produce crc error alarm;
Doubtful Slot determining unit, for determining the time slot corresponding with the crc error alarm moment according to the scheduling of OLT to time slot in crc error alarm moment and PON system, wherein, each time slot is corresponding with an ONU respectively;
Doubtful abnormal ONU determining unit, for using the ONU corresponding to the time slot corresponding with the crc error alarm moment and ONU corresponding to the adjacent time slot of the time slot corresponding with the crc error alarm moment all as doubtful abnormal luminous ONU;
Ascending time slot expanding element, for for each doubtful abnormal luminous ONU, carries out left and right expansion respectively to ascending time slot corresponding thereto;
Judging unit, for judging whether the increment being expanded the crc error message of ascending time slot before expanding rear and expansion is less than setting threshold;
ONU status determining unit, if be less than setting threshold for the increment of the crc error message caused due to left side expansion or right extension, then determine that the ONU that this is expanded corresponding to time slot is abnormal luminous ONU, if because the increment of the crc error message that left side is expanded and right extension causes all exceedes setting threshold, then determine that the ONU that this is expanded corresponding to time slot is normal luminous ONU.
In embodiments more of the present disclosure, ascending time slot expanding element is when expanding the ascending time slot corresponding to doubtful abnormal luminous ONU, if do not have enough upstream datas to cause partly overlapping to adjacent time-slots, then the doubtful abnormal luminous ONU corresponding with being expanded time slot is indicated to send the upstream data of regular length to realize partly overlapping between time slot.
In embodiments more of the present disclosure, ascending time slot expanding element, when time slot corresponding to doubtful abnormal luminous ONU carries out left and right expansion respectively, is not expanded the time slot in PON system corresponding to other ONU.
In technical scheme of the present disclosure, owing to having carried out left and right expansion to the time slot corresponding to doubtful abnormal luminous ONU, then determine whether this doubtful abnormal luminous ONU is really abnormal luminous ONU according to the crc error message number before and after expansion.Owing to not turning off the transmitter supply of any detected ONU in whole testing process, therefore, ensure that normally carrying out of this ONU up-downgoing business to the full extent.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the disclosure, forms a application's part.In the accompanying drawings:
Fig. 1 is the schematic flow sheet of the method for abnormal luminous ONU in the detection PON system of a disclosure embodiment.
Fig. 2 is the schematic diagram that disclosure PON up direction uses TDMA access way.
Fig. 3 is the structural representation of the OLT of a disclosure embodiment.
Embodiment
Below with reference to accompanying drawings the disclosure is described.It should be noted that following being described in is only explanatory and exemplary in essence, never as any restriction to the disclosure and application or use.Unless stated otherwise, otherwise positioned opposite and numerical expression and the numerical value of the parts of setting forth in an embodiment and step do not limit the scope of the present disclosure.In addition, technology well known by persons skilled in the art, method and apparatus may not be discussed in detail, but are intended to the part becoming specification in appropriate circumstances.
At present, the reason of ONU fault can comprise software reason and hardware reason.Comprise optical module hardware fault at hardware reason, such as, at the appointed time cannot open or close the transmitter supply of ONU optical module laser.Occur that shifting to an earlier date or postpone opening/closing laser transmitters power supply can cause slot offset, may affect previous ONU or a rear ONU ascending time slot, cause the interference of data between time slot.In addition, hardware fault also may be that optical module does not accept instruction, thorough " extremely ".Software reason comprises the instruction that issues of process OLT and there is time delay, or PON chip has problems with coordinating between optical module chip, causes the time window transmission upstream data of not specifying in agreement.
The following embodiment of the disclosure proposes a kind of Detection and diagnosis scheme to ONU abnormal luminous in PON system, the detection that it detects in conjunction with OLT/ONU luminous power in PON system and in Dynamic Bandwidth Allocation, dynamic distance delay compensation mechanism carries out abnormal luminous ONU, the program can realize the diagnosis and detection of abnormal luminous ONU in PON system effectively, and effective isolated fault ONU, the impact of diagnosis and detection on business can be reduced to minimum degree again simultaneously.
Particularly, by analyzing the phenomenon that in PON system, abnormal luminous ONU fault causes, once due to the transmitting power of abnormal luminous ONU be not enough to interrupt its place PON port under all ONU, then still will be in line states by some ONU, all the other are disturbed or the ONU that interrupts cannot normal registration, are in the state of going offline.The disclosure carries out performance statistics by performance statistics and analytic function for OLT PON mouth, the situation of principal statistical crc error message, the associate uplink bandwidth time slots of crc error message is produced by time slot analysis and adjustment functional analysis, the ONU that these time slots and the adjacent time-slots of these time slots carry out transmitting uplink data is classified as doubtful abnormal luminous ONU, and carries out next step failure diagnosis.
Diagnose for doubtful abnormal luminous ONU, time slot is distributed by time slot analysis and the upstream bandwidth of this ONU of adjustment Function Extension, make it to occur overlapping with adjacent time-slots, and whether the ONU be again expanded by the situation diagnosis time slot of OLT PON mouth performance statistics crc error message is abnormal luminous ONU.
Before the abnormal luminous ONU Diagnostic Strategy of startup, carry out twice OLT PON mouth performance statistics, add up the quantity that this is expanded the crc error message of the ONU of time slot.First, adjust doubtful abnormal luminous ONU upstream bandwidth and distribute time slot, occur overlapping with the ascending time slot of adjacent ONU, carry out OLT PON mouth performance statistics, it is pointed out that and need to carry out twice herein, once overlapping with slot portion below, judge whether to occur that laser does not cut out according to protocol time, another time is overlapping with slot portion above, judges whether the situation occurring that laser is opened in advance.Then, then recover ONU upstream bandwidth time slot allocation, do not cause slot portion overlapping artificially, and again carry out OLT PON mouth crc error message performance statistics.If no matter whether adjust ONU upstream bandwidth time slot, twice OLT PON mouth performance statistics all has the crc error message of this ONU, and the increment of crc error message is less than setting threshold, then determine that this doubtful abnormal luminous ONU is abnormal luminous ONU; Otherwise only just can count on the obvious increase of crc error message after adjustment ONU upstream bandwidth time slot, that is, the increment of crc error message is greater than setting threshold, then judge that this ONU is not abnormal luminous ONU.
For the abnormal luminous ONU diagnosed out, close its optical module laser transmitters power supply, to carry out Fault Isolation.
Fig. 1 is the schematic flow sheet of the method for abnormal luminous ONU in the detection PON system of a disclosure embodiment.
As shown in Figure 1, this embodiment can comprise the following steps:
S102, to judge in the adjustment settings time interval that OLT in PON system distribute by each ONU the crc error message of ascending time slot increment whether exceed setting error thresholds respectively, as exceeded, then produce crc error alarm;
Particularly, add up with the number of ONU as the crc error message of the ascending time slot of index within the time interval set, then the number of the number of the crc error message occurred in current time interval with the error message of identical ONU in the last time interval is compared, if increment exceedes setting error thresholds, then show that this ONU may occur abnormal luminous, such as, there is luminescence or delayed luminescence etc. in advance, and then cause the crc error message data of time slot corresponding to this ONU significantly to increase, now can trigger crc error alarm.
S104, determines the time slot corresponding with the crc error alarm moment according to the scheduling of OLT to time slot in crc error alarm moment and PON system, and wherein, each time slot is corresponding with an ONU respectively;
Particularly, OLT have recorded the ONU information that each moment dispatches when dispatching ONU, because the time of crc error counting messages is very little compared with the time of whole time slot, therefore can ignore, now, the crc error alarm moment can be utilized as the moment of OLT to doubtful abnormal luminous ONU scheduling, go out the ONU corresponding to the time slot corresponding with the crc error alarm moment according to each time slot stored in this temporal information and OLT and the scheduling relational query between ONU.
S106, using the ONU corresponding to the time slot corresponding with the crc error alarm moment and ONU corresponding to the adjacent time slot of the time slot corresponding with the crc error alarm moment all as doubtful abnormal luminous ONU;
The time slot position error caused by the crc error alarm moment doubtful abnormal luminous ONU in location is caused in order to prevent because the crc error alarm moment is in the edge of time slot, using the ONU corresponding to the time slot corresponding with the crc error alarm moment as while doubtful abnormal luminous ONU, also using the ONU corresponding to the adjacent time-slots of the time slot corresponding with the crc error alarm moment also as doubtful abnormal luminous ONU.
S108, for each doubtful abnormal luminous ONU, carries out left and right expansion respectively to ascending time slot corresponding thereto;
Such as, it is luminous in advance that OLT dispatches this doubtful abnormal luminous ONU, namely be equivalent to carry out left side expansion to the ascending time slot corresponding to this ONU, after left side expansion being detected to this ONU and being whether real abnormal luminous ONU, OLT can continue to dispatch this doubtful abnormal luminous ONU delayed luminescence, is namely equivalent to carry out right extension to the ascending time slot corresponding to this ONU.
If this doubtful abnormal luminous ONU is normal luminous ONU, then it normally can receive the dispatch command that OLT sends, and open or close ONU optical module laser transmitters power supply according to dispatch command, as being abnormal luminous ONU, then this ONU normally can not receive or normally perform the timeslot scheduling instruction that OLT sends, such as, can not according to the scheduling open and/or closed ONU optical module laser transmitters power supply of OLT.
S110, judges whether the increment being expanded the crc error message of ascending time slot after expanding and before expansion is less than setting threshold;
Such as, if faulted ONU can not normally receive or perform the instruction of the luminous in advance or delayed luminescence that OLT sends, after then causing ascending time slot to be expanded, the quantity of the crc error message of this time slot differs less with the quantity of the crc error message of this time slot before expansion, such as, increment is less than setting threshold, then show that this ONU does not open or late release transmitter supply in advance according to OLT scheduling; If this ONU is non-faulting ONU, then it can be opened or late release transmitter supply in advance according to OLT scheduling, time slot partly overlaps owing to causing with front or rear time slot and this crc error message number being expanded time slot significantly increased after can be caused like this to expand, such as, increment is greater than setting threshold, then show that this ONU normally opens according to OLT dispatch command or closes transmitter supply.
S112, if the increment of crc error message caused due to left side expansion or right extension is less than setting threshold, then determines that the ONU that this is expanded corresponding to time slot is abnormal luminous ONU;
If the expansion of either side causes the increment of crc error message to be less than setting threshold, then show that this ONU may exist the problem of unlatching or late release in advance.
S114, if the increment of crc error message caused due to left side expansion and right extension all exceedes setting threshold, then determines that the ONU that this is expanded corresponding to time slot is normal luminous (that is, non-abnormal luminous) ONU;
Particularly, ONU is abnormal luminous may because unlatching or late release transmitter supply cause in advance, therefore, the increment of the crc error message needing left side expansion to cause with right extension just shows that this ONU is non-abnormal luminous ONU when all exceeding setting threshold.
In this embodiment, owing to having carried out left and right expansion to the time slot corresponding to doubtful abnormal luminous ONU, then determine whether this doubtful abnormal luminous ONU is really abnormal luminous ONU according to the crc error message number before and after expansion.Owing to not turning off the transmitter supply of any detected ONU in whole testing process, therefore, ensure that normally carrying out of this ONU up-downgoing business to the full extent.
Further, after step sl 12, if determine that doubtful abnormal luminous ONU is real abnormal luminous ONU, then the optical module laser transmitters power supply of abnormal luminous ONU is closed, to realize Fault Isolation.
Further, in step S108, when expanding the ascending time slot corresponding to doubtful abnormal luminous ONU, if do not have enough upstream datas to cause slot portion overlapping, then OLT indicates the doubtful abnormal luminous ONU corresponding with being expanded time slot to send the upstream data of regular length to realize partly overlapping between time slot.
In addition, it is to be noted, in order to get rid of the interference of other ONU to measured ONU, when time slot corresponding to doubtful abnormal luminous ONU carries out left and right expansion respectively, time slot in PON system corresponding to other ONU is not expanded, that is, open according to the normal consistency of OLT or close transmitter supply.
Next, by an instantiation, technical scheme of the present disclosure is described further.
In EPON system, adopt the access way of TDMA at up direction, that is, each ONU sends upstream to OLT in specific time window, and the conflict of the uplink service stream that will ensure each ONU not on time of origin.OLT central controlled ascending time slot distribution mechanism is exactly by the SLA(Service Level Agreement of OLT according to each ONU, service-level agreement) (namely the upstream bandwidth demand that reports in conjunction with each ONU distribute up mandate time slot to each ONU, grant window), each grant is a time window, comprises the length of initial time and time window; The uplink authorization time slot that all ONU distribute according to OLT, to up transmission data flow, this assures the conflict not on time of origin of upstream between each ONU, also improves the utilization ratio of upstream bandwidth simultaneously.And once adjust certain time slot and just can cause Time Slot Overlap, as shown in Figure 2.
The method of screening abnormal luminous ONU in PON system is divided into two stages of diagnosis and detection by this embodiment.At abnormal luminous ONU detection-phase, when occurring abnormal luminous ONU problem in PON system, once faulted ONU occurs abnormal luminous, and its luminous power is when being not enough to interfere with other all ONU under same OLT PON mouth, to there will be a part of ONU be interfered and roll off the production line, and another part ONU is still online.In order to realize object of the present disclosure, utility statistics and analytic function realize the statistics to OLT PON mouth performance, such as, the up crc error message of ONU under PON mouth is added up, increase once at a time crc error message is abnormal, trigger time slot analysis and carry out upstream bandwidth time slot analysis with adjustment function, stab if having time owing to reporting CRC message, be based on OLT local zone time, OLT distributes according to local zone time, these temporal informations are recorded by OLT and preserve, when receiving CRC alarm, the timestamp information of CRC message when crc error message increment just can have been exceeded setting error thresholds with distribute time slot the concrete time compare, specifically can locate the time slot of the associate uplink bandwidth producing crc error message, the time slot that this time slot is adjacent, and the ONU that these time slots are corresponding, the ONU these time slots being carried out transmitting uplink data is classified as the failure diagnosis that doubtful abnormal luminous ONU carries out next step.Why finding out doubtful abnormal luminous ONU is to reduce detection range, reduces the impact on system business.
Particularly, the step detecting abnormal luminous ONU can comprise:
Step 1, by daily routine OLT PON mouth performance statistics, increases (that is, the increment of the crc error message in the adjustment settings time interval exceedes setting error thresholds) once the crc error message that certain ONU occurs is abnormal, then produces crc error alarm.
Step 2, by crc error alarm triggered upstream bandwidth time slot analysis, to produce the moment of crc error alarm for benchmark, when locating this, the time slot of corresponding upstream bandwidth, is time slot A by this slot definition.
Step 3, in order to prevent omitting the diagnosis to abnormal luminous ONU, also needing to orient adjacent time-slots, is time slot B and C by adjacent two slot definition.These time slots may be the interference sources causing A time slot crc error message.In addition, the uncertainty that adjacent time-slots can also prevent from bringing because alarm time is inaccurate is located.
Step 4, orient upstream bandwidth time slot A, time slot B and the ONU corresponding to time slot C successively, the ONU that these time slots (that is, time slot A, B and C) carry out transmitting uplink data is classified as doubtful abnormal luminous ONU, form a doubtful abnormal luminous ONU list, carry out next step failure diagnosis.
In abnormal luminous ONU diagnostic phases, in order to realize object of the present disclosure, when the time slot allocation for all ONU upstream bandwidths, the upstream bandwidth time slot of doubtful abnormal luminous ONU is expanded, make it to overlap with the upstream bandwidth time slot of adjacent ONU, and then diagnose this ONU whether to be abnormal luminous ONU by OLT PON mouth performance statistics.
It is to be noted, make not have enough upstream datas to cause overlap between time slot if the uplink service of ONU is less under PON mouth, so after the abnormal luminous ONU Diagnostic Strategy of startup, OLT is sent the upstream data of regular length by specifying this by the doubtful abnormal luminous ONU diagnosed, such as: the character string of 10101010.
In to PON system abnormal luminous ONU diagnostic procedure in, from doubtful abnormal luminous ONU list, choose arbitrarily one carry out the adjustment of upstream bandwidth time slot as by the ONU diagnosed by time slot analysis and adjustment function, specific as follows:
Step 1, calculated the time slot of upstream bandwidth for online ONU each under OLT PON by PON system original dynamic bandwidth dispatching algorithm, be handed down to by upstream bandwidth Time slot allocation situation except by other ONU except diagnosis ONU, the current time slot by diagnosis ONU is handed down to after then expanding on the basis of original algorithm result of calculation that this is current by the doubtful abnormal luminous ONU diagnosed again.
Step 2, after the abnormal luminous ONU diagnosis of startup, adjust this ONU upstream bandwidth time slot window, first this ONU time slot window end time is postponed (such as, 1000ns), that is, the time slot end time is postponed by the time of the closedown of retard transmitter power supply, but the time started is constant, now the time slot with a follow-up ONU overlaps by the upstream bandwidth time slot of doubtful abnormal luminous ONU.
Step 3, carries out OLT PON mouth performance statistics, principal statistical this diagnosed the quantity of the up crc error message of ONU.
Step 4, recover to be diagnosed the adjustment of ONU upstream bandwidth time slot to this, no longer people causes this to be diagnosed partly overlapping of time slot and subsequent timeslot, again carries out OLT PON mouth performance statistics, principal statistical this diagnosed the quantity of the up crc error message of ONU.
Step 5, the quantity of the crc error message of ONU is diagnosed twice relatively, if twice OLT PON mouth performance statistics all has crc error message before and after adjustment, and the number of crc error message is less than setting threshold with the number difference of the front crc error message of adjustment after adjustment, then this ONU is diagnosed as abnormal luminous ONU, and ONU optical module laser does not cut out on request, has postponed the shut-in time.If the number that only just can count on crc error message after adjustment ONU upstream bandwidth time slot significantly increases, then judge that this ONU is not abnormal luminous ONU, do not have abnormal luminous interfere with subsequent ONU.The above-mentioned Main Basis judged causes before and after ascending time slot overlap as adjustment dynamic delay, if this ONU is abnormal luminous all can disturb other ONU, and disturb by other ONU and produce crc error message; If but this ONU does not have abnormal luminous interfere with subsequent ONU, so after its ascending time slot of recovery adjustment, other ONU can not be disturbed, or disturb by other ONU and produce crc error message.
Step 6, if this ONU is not diagnosed as abnormal luminous, again adjust its ascending time slot distribution condition, by this ONU time slot window start time in advance (such as, 1000ns), that is, the mode by opening transmitter supply in advance carrys out the time started of this time slot in advance, but the end time is constant, now the time slot with an ONU above overlaps by the upstream bandwidth time slot of doubtful abnormal luminous ONU.
Step 7, by OLT PON mouth performance statistics, and compares this and is diagnosed the situation of change of the up crc error message amount of OUN.If still only just crc error message can be counted on after adjustment ONU upstream bandwidth time slot or crc error message amount obviously increases, then judge that this ONU is not abnormal luminous ONU, there is no the ONU of the previous time slot of abnormal luminous interference.In conjunction with the diagnostic result of twice adjustment ascending time slot, judge that this ONU is not abnormal luminous ONU.If twice new capability statistics all has crc error message and error message quantity does not obviously increase, be then diagnosed as abnormal luminous ONU, then judge that this ONU is as abnormal luminous ONU, and ONU optical module laser do not opened on request, is advanced by opening time.
Step 8, is abnormal luminous ONU if current by diagnosis ONU, then forever closes its optical module laser transmitters power supply, realize the isolation of faulted ONU.
Step 9, is not abnormal luminous ONU if current by diagnosis ONU, then it is deleted from doubtful abnormal luminous ONU list, and from list, choose a doubtful abnormal luminous ONU again as by diagnosis ONU, diagnose according to the method for step 1 ~ step 7.
One of ordinary skill in the art will appreciate that, realize the whole of said method embodiment to have been come by the hardware that program command is relevant with part steps, aforesaid program can be stored in a computing equipment read/write memory medium, this program is when performing, perform and comprise the step of said method embodiment, and aforesaid storage medium can comprise ROM, RAM, magnetic disc and CD etc. various can be program code stored medium.
Fig. 3 is the structural representation of the OLT of a disclosure embodiment.
As shown in Figure 3, the OLT30 in this embodiment can comprise:
CRC alarm generation unit 302, for judge in the adjustment settings time interval that OLT in PON system distribute by each ONU the crc error message of ascending time slot increment whether exceed setting error thresholds respectively, as exceeded, then produce crc error alarm;
Doubtful Slot determining unit 304, for determining the time slot corresponding with the crc error alarm moment according to the scheduling of OLT to time slot in crc error alarm moment and PON system, wherein, each time slot is corresponding with an ONU respectively;
Doubtful abnormal ONU determining unit 306, for using the ONU corresponding to the time slot corresponding with the crc error alarm moment and ONU corresponding to the adjacent time slot of the time slot corresponding with the crc error alarm moment all as doubtful abnormal luminous ONU;
Ascending time slot expanding element 308, for for each doubtful abnormal luminous ONU, carries out left and right expansion respectively to ascending time slot corresponding thereto;
Judging unit 310, for judging whether the increment being expanded the crc error message of ascending time slot before expanding rear and expansion is less than setting threshold;
ONU status determining unit 312, if be less than setting threshold for the increment of the crc error message caused due to left side expansion or right extension, then determine that the ONU that this is expanded corresponding to time slot is abnormal luminous ONU, if because the increment of the crc error message that left side is expanded and right extension causes all exceedes setting threshold, then determine that the ONU that this is expanded corresponding to time slot is normal luminous ONU.
In this embodiment, owing to having carried out left and right expansion to the time slot corresponding to doubtful abnormal luminous ONU, then determine whether this doubtful abnormal luminous ONU is really abnormal luminous ONU according to the crc error message number before and after expansion.Owing to not turning off the transmitter supply of any detected ONU in whole testing process, therefore, ensure that normally carrying out of this ONU up-downgoing business to the full extent.
In addition, ascending time slot expanding element is when expanding the ascending time slot corresponding to doubtful abnormal luminous ONU, if do not have enough upstream datas to cause partly overlapping to adjacent time-slots, then the doubtful abnormal luminous ONU corresponding with being expanded time slot is indicated to send the upstream data of regular length to realize partly overlapping between time slot.
Further, ascending time slot expanding element, when time slot corresponding to doubtful abnormal luminous ONU carries out left and right expansion respectively, is not expanded the time slot in PON system corresponding to other ONU.
In this specification, each embodiment all adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, and part identical with similar between each embodiment can cross-reference.For device embodiment, due to itself and embodiment of the method basic simlarity, so description is fairly simple, relevant part can see the explanation of embodiment of the method part.
Although describe the disclosure with reference to exemplary embodiment, should be understood that the disclosure is not limited to above-mentioned exemplary embodiment.It will be obvious to those skilled in the art that and can revise above-mentioned exemplary embodiment under the condition not deviating from the scope of the present disclosure and spirit.The scope of appended claim should be endowed the widest explanation, to comprise all such amendments and equivalent 26S Proteasome Structure and Function.
Claims (6)
1. detect a method of abnormal luminous ONU in PON system, it is characterized in that, comprising:
To judge in the adjustment settings time interval that OLT in PON system distribute by each ONU the crc error message of ascending time slot increment whether exceed setting error thresholds respectively, as exceeded, then produce crc error alarm;
Determine the time slot corresponding with the crc error alarm moment according to the scheduling of OLT to time slot in crc error alarm moment and PON system, wherein, each time slot is corresponding with an ONU respectively;
Using the ONU corresponding to the time slot corresponding with the crc error alarm moment and ONU corresponding to the adjacent time slot of the time slot corresponding with the crc error alarm moment all as doubtful abnormal luminous ONU;
For each doubtful abnormal luminous ONU, left and right expansion is carried out respectively to ascending time slot corresponding thereto;
Judge whether the increment being expanded the crc error message of ascending time slot after expanding and before expansion is less than setting threshold;
If because the increment of the crc error message that left side is expanded or right extension causes is less than setting threshold, then determine that the ONU that this is expanded corresponding to time slot is abnormal luminous ONU;
If because the increment of the crc error message that left side is expanded and right extension causes all exceedes setting threshold, then determine that the ONU that this is expanded corresponding to time slot is normal luminous ONU.
2. the method for abnormal luminous ONU in detection PON system according to claim 1, it is characterized in that, described method also comprises:
When expanding the ascending time slot corresponding to doubtful abnormal luminous ONU, if do not have enough upstream datas to cause slot portion overlapping, then OLT indicates the doubtful abnormal luminous ONU corresponding with being expanded time slot to send the upstream data of regular length to realize partly overlapping between time slot.
3. the method for abnormal luminous ONU in detection PON system according to claim 1, is characterized in that, when time slot corresponding to doubtful abnormal luminous ONU carries out left and right expansion respectively, does not expand the time slot in PON system corresponding to other ONU.
4. an OLT, is characterized in that, comprising:
CRC alarm generation unit, for judge in the adjustment settings time interval that OLT in PON system distribute by each ONU the crc error message of ascending time slot increment whether exceed setting error thresholds respectively, as exceeded, then produce crc error alarm;
Doubtful Slot determining unit, for determining the time slot corresponding with the crc error alarm moment according to the scheduling of OLT to time slot in crc error alarm moment and PON system, wherein, each time slot is corresponding with an ONU respectively;
Doubtful abnormal ONU determining unit, for using the ONU corresponding to the time slot corresponding with the crc error alarm moment and ONU corresponding to the adjacent time slot of the time slot corresponding with the crc error alarm moment all as doubtful abnormal luminous ONU;
Ascending time slot expanding element, for for each doubtful abnormal luminous ONU, carries out left and right expansion respectively to ascending time slot corresponding thereto;
Judging unit, for judging whether the increment being expanded the crc error message of ascending time slot before expanding rear and expansion is less than setting threshold;
ONU status determining unit, if be less than setting threshold for the increment of the crc error message caused due to left side expansion or right extension, then determine that the ONU that this is expanded corresponding to time slot is abnormal luminous ONU, if because the increment of the crc error message that left side is expanded and right extension causes all exceedes setting threshold, then determine that the ONU that this is expanded corresponding to time slot is normal luminous ONU.
5. OLT according to claim 4, it is characterized in that, described ascending time slot expanding element is when expanding the ascending time slot corresponding to doubtful abnormal luminous ONU, if do not have enough upstream datas to cause partly overlapping to adjacent time-slots, then the doubtful abnormal luminous ONU corresponding with being expanded time slot is indicated to send the upstream data of regular length to realize partly overlapping between time slot.
6. OLT according to claim 4, is characterized in that, described ascending time slot expanding element, when time slot corresponding to doubtful abnormal luminous ONU carries out left and right expansion respectively, is not expanded the time slot in PON system corresponding to other ONU.
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