CN101222278B - Method and system for detecting uplink time slot conflict of optical network unit - Google Patents
Method and system for detecting uplink time slot conflict of optical network unit Download PDFInfo
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- CN101222278B CN101222278B CN2007100008821A CN200710000882A CN101222278B CN 101222278 B CN101222278 B CN 101222278B CN 2007100008821 A CN2007100008821 A CN 2007100008821A CN 200710000882 A CN200710000882 A CN 200710000882A CN 101222278 B CN101222278 B CN 101222278B
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Abstract
The invention discloses a method and a system for detecting uplink time slot conflict of an optical network unit. Detecting ONU uplink time slot collision, if meeting a first trigger condition, going to S104, if meeting a second trigger condition, going to S110; s104, closing the ONUi, and if the fault disappears, going to S106, and if the fault does not disappear, returning to S104 if i is i-1; s106, reopening the ONUi, if the fault is reproduced, going to S108, otherwise, going to S116; s108, reporting the uplink time slot conflict of the network management ONUi, and closing the ONUi to S116; s110, turning off ONUi-1, if the fault disappears, going to S112, if the fault does not disappear, i is i-1, and returning to S110; s112, reopening ONUi-1, if the fault is reproduced, going to S114, otherwise, going to S116; s114, reporting that uplink time slot conflict occurs in the network management ONUi-1, and closing the ONUi-1.
Description
Technical field
The present invention relates to gigabit passive optical network, relate in particular to a kind of detection method and system of ascending time slot collision of optical network unit.
Background technology
In GPON (GiBit Passive Optic Network, gigabit passive optical network) system, ONU (Optical Network Unit; Optical network unit) up is the transfer of data of carrying out according to time-multiplexed mode; The ascending time slot of ONU is distributed by OLT (OpticalLine Termination, optical line terminal), and ONU carries out data in strict accordance with ascending time slot and transmits; According to standard code; Has between the transmission time slot of ONU and protect at interval, but the situation that the ascending time slot of meeting generation ONU overlaps in reality specifically there are two kinds of possibilities:
1) the ONU laser is owing to reason generation time delayed turn-off such as aging, and promptly transmission time slot is greater than the length of distributing, and can not be through increasing protection slot length and the method correction of balanced time delay between the different ONU.
2) because the fault and some malice of optical device are carried out the interference behavior; Make the laser of ONU continue luminous; The result causes all ONU uplink optical signals a kind of bias light that superposes; If this bias light enough can increase the error rate of other ONU up links by force, even cause the interruption fully of uplink communication.
In the application of reality, if there is not effectively to detect and find the method for faulted ONU, will limit the application of GPON system greatly, increase maintenance cost and fault location time.
Therefore, need a kind of technical scheme, can solve the ONU ascending time slot collision fault in the GPON system.
G.984 defined the signal of each ONU uplink optical fiber Link State of complete monitoring, as LOFi (the ONUi LOF: Loss of Frame), Loss of Signal) and ERRi (the ONUi error rate: Error Rate) etc. LOSi (ONUi dropout:.Therefore though the situation of time slot collision can not directly located and detect to these states, the generation of time slot collision can have influence on the change of these states, can utilize the situation of change of state to carry out the detection and the location of time slot collision.
When overlapping region bias light signal power is very short much smaller than signal power or duration; Deficiency causes the variation of link error rates or causes losing of frame synchronization; The generation of time slot collision is to PON (Passive Optic Network at this moment; EPON) not influence of uplink communication can be ignored, and need not handle.When the conflict that makes a difference, under condition of different, have different state and change.Can utilize the variation of these states to judge single or a plurality of ONU of time slot collision.
Summary of the invention
Main purpose of the present invention is to provide a kind of detection method and system of ascending time slot collision of optical network unit, and the signal of the monitoring ONU uplink optical fiber Link State that is used for G.984 defining based on ITU-T carries out fast detecting time slot collision and fault location ONU.
Describe for convenient, according to the order of occurrence of ascending time slot, with the ONU ordering, i representes its sequence number, and max representes maximum sequence number.
To achieve these goals, according to a first aspect of the invention, the invention provides a kind of detection method of ascending time slot collision of optical network unit.This detection method may further comprise the steps:
Step S102, optical line terminal detects the triggering of ascending time slot collision of optical network unit, if the ascending time slot collision of optical network unit ONU i satisfies first trigger condition; Then proceed to step S104; If the ascending time slot collision of optical network unit ONU i satisfies second trigger condition, then proceed to step S110, wherein; I is a natural number, is the numbering of optical network unit ONU;
Step S104 closes optical network unit ONU i, and whether failure judgement disappears, if disappear, then proceeds to step S106, if do not disappear, then makes i=i-1, returns execution in step S104, wherein, then makes i become maximum numbering by i=0 if i=i-1 makes;
Step S106 opens optical network unit ONU i again, if fault recurrence then proceeds to step S108, otherwise proceeds to step S116;
Step S108 reports webmaster optical network unit ONU i ascending time slot collision to occur, closes optical network unit ONU i, proceeds to step S116;
Step S110 closes optical network unit ONU i-1, and whether failure judgement disappears, if disappear, then proceeds to step S112, if do not disappear, then makes i=i-1, returns execution in step S110, wherein, then makes i become maximum numbering by i=0 if i=i-1 makes;
Step S112 opens optical network unit ONU i-1 again, if fault recurrence then proceeds to step S114, otherwise proceeds to step S116;
Step S114 reports webmaster optical network unit ONU i-1 ascending time slot collision to occur, closes optical network unit ONU i-1;
Step S116 judges also to have ascending time slot collision of optical network unit, if then proceed to step S102, otherwise finish.
First trigger condition comprises that the burst length that optical line terminal detects ONUi surpasses allocated length, and can't be normal through the EqD adjustment.
Second trigger condition comprises that one or more ONUi produce the LOFi/SFi signals, and the ONUi state is normal when finding range again.
Second trigger condition comprises that one or more ONUi ERRi increase in continuous multiple frames, and again the range finding during the time ONUi ERRi normal.
Second trigger condition comprises that one or more ONUi produce LOFi/S Fi signals, and the ONUi state is normal when finding range again, and perhaps one or more ONUi ERRi increase in continuous multiple frames, and the ERRi of ONUi is normal again during the range finding time.
To achieve these goals, according to a second aspect of the invention, the invention provides a kind of detection system of ascending time slot collision of optical network unit.This detection system comprises: optical line terminal is used to detect the triggering of ascending time slot collision of optical network unit; First locating module is positioned at the optical line terminal side, is used for satisfying under the situation of first trigger condition at the ascending time slot collision of optical network unit ONU i, closes optical network unit ONU i; Whether failure judgement disappears, if do not disappear, then makes i=i-1, closes optical network unit ONU i; Disappear up to fault, open optical network unit ONU i again, if fault recurrence then reports webmaster optical network unit ONU i ascending time slot collision to occur; Close optical network unit ONU i, wherein, i is a natural number; Be the numbering of optical network unit ONU, then make i become maximum numbering by i=0 if i=i-1 makes; Second locating module is positioned at the optical line terminal side, is used for satisfying under the situation of second trigger condition at the ascending time slot collision of optical network unit ONU i, closes optical network unit ONU i-1; Whether failure judgement disappears, if do not disappear, then makes i=i-1; Close optical network unit ONU i-1, disappear, open optical network unit ONU i-1 again up to fault; If fault recurrence then reports webmaster optical network unit ONU i-1 ascending time slot collision to occur, close optical network unit ONU i-1; Wherein, if making, i=i-1 then makes i become maximum numbering by i=0.
First trigger condition comprises that the burst length that optical line terminal detects ONUi surpasses allocated length, and can't be normal through the EqD adjustment.
Second trigger condition comprises that one or more ONUi produce the LOFi/SFi signals, and the ONUi state is normal when finding range again.
Second trigger condition comprises that one or more ONUi ERRi increase in continuous multiple frames, and again the range finding during the time ONUi ERRi normal.
Second trigger condition comprises that one or more ONUi produce the LOFi/SFi signals, and the ONUi state is normal when finding range again, and perhaps one or more ONUi ERRi increase in continuous multiple frames, and the ERRi of ONUi is normal again during the range finding time.
Pass through technique scheme; The present invention adopts Performance Detection and the alarm data that has defined; Mode through closing possibility ONU is one by one located the ONU that causes time slot collision, can reduce the influence to normal ONU, can in time judge the time slot collision of ONU as the process of a circulation.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the detection method of ascending time slot collision of optical network unit of the present invention;
Fig. 2 is the block diagram according to the detection system of ascending time slot collision of optical network unit of the present invention;
Fig. 3 is the normal ONU ascending time slot transmission figure according to the embodiment of the invention;
Fig. 4 is the sketch map according to time slot collision between two adjacent ONU of the embodiment of the invention;
Fig. 5 is according to the lasting luminous sketch map that causes taking place with follow-up a plurality of or all ONU ascending time slot collisions of the laser of an ONU of the embodiment of the invention; And
Fig. 6 is the realization flow figure according to the method for the embodiment of the invention.
Embodiment
Specify the present invention below with reference to accompanying drawing.
With reference to Fig. 1, may further comprise the steps according to the detection method of ascending time slot collision of optical network unit of the present invention:
Step S102, optical line terminal detects the triggering of ascending time slot collision of optical network unit, if the ascending time slot collision of optical network unit ONU i satisfies first trigger condition; Then proceed to step S104; If the ascending time slot collision of optical network unit ONU i satisfies second trigger condition, then proceed to step S110, wherein; I is a natural number, is the numbering of optical network unit ONU;
Step S104 closes optical network unit ONU i, and whether failure judgement disappears, if disappear, then proceeds to step S106, if do not disappear, then makes i=i-1, returns execution in step S104, wherein, then makes i become maximum numbering by i=0 if i=i-1 makes;
Step S106 opens optical network unit ONU i again, if fault recurrence then proceeds to step S108, otherwise proceeds to step S116;
Step S108 reports webmaster optical network unit ONU i ascending time slot collision to occur, closes optical network unit ONU i, proceeds to step S116;
Step S110 closes optical network unit ONU i-1, and whether failure judgement disappears, if disappear, then proceeds to step S112, if do not disappear, then makes i=i-1, returns execution in step S110, wherein, then makes i become maximum numbering by i=0 if i=i-1 makes;
Step S112 opens optical network unit ONU i-1 again, if fault recurrence then proceeds to step S114, otherwise proceeds to step S116;
Step S114 reports webmaster optical network unit ONU i-1 ascending time slot collision to occur, closes optical network unit ONU i-1;
Step S116 judges also to have ascending time slot collision of optical network unit, if then proceed to step S102, otherwise finish.
First trigger condition comprises that the burst length that optical line terminal detects ONUi surpasses allocated length, and can't be normal through the EqD adjustment.
Second trigger condition comprises that one or more ONUi produce the LOFi/SFi signals, and the ONUi state is normal when finding range again.
Second trigger condition comprises that one or more ONUi ERRi increase in continuous multiple frames, and again the range finding during the time ONUi ERRi normal.
Second trigger condition comprises that one or more ONUi produce the LOFi/SFi signals, and the ONUi state is normal when finding range again, and perhaps one or more ONUi ERRi increase in continuous multiple frames, and the ERRi of ONUi is normal again during the range finding time.
With reference to Fig. 2, comprise according to the detection system 10 of ascending time slot collision of optical network unit of the present invention: optical line terminal 20 is used to detect the triggering of ascending time slot collision of optical network unit; First locating module 30 is positioned at optical line terminal 20 sides, is used for satisfying under the situation of first trigger condition at the ascending time slot collision of optical network unit ONU i, closes optical network unit ONU i; Whether failure judgement disappears, if do not disappear, then makes i=i-1, closes optical network unit ONU i; Disappear up to fault, open optical network unit ONU i again, if fault recurrence then reports webmaster optical network unit ONU i ascending time slot collision to occur; Close optical network unit ONU i, wherein, i is a natural number; Be the numbering of optical network unit ONU, then make i become maximum numbering by i=0 if i=i-1 makes; Second locating module 40 is positioned at optical line terminal 20 sides, is used for satisfying under the situation of second trigger condition at the ascending time slot collision of optical network unit ONU i, closes optical network unit ONU i-1; Whether failure judgement disappears, if do not disappear, then makes i=i-1; Close optical network unit ONU i-1, disappear, open optical network unit ONU i-1 again up to fault; If fault recurrence then reports webmaster optical network unit ONU i-1 ascending time slot collision to occur, close optical network unit ONU i-1; Wherein, if making, i=i-1 then makes i become maximum numbering by i=0.
First trigger condition comprises that the burst length that optical line terminal 20 detects ONUi surpasses allocated length, and can't be normal through the EqD adjustment.
Second trigger condition comprises that one or more ONUi produce the LOFi/SFi signals, and the ONUi state is normal when finding range again.
Second trigger condition comprises that one or more ONUi ERRi increase in continuous multiple frames, and again the range finding during the time ONUi ERRi normal.
Second trigger condition comprises that one or more ONUi produce LOFi/S Fi signals, and the ONUi state is normal when finding range again, and perhaps one or more ONUi ERRi increase in continuous multiple frames, and the ERRi of ONUi is normal again during the range finding time.
The present invention relates to the GPON system, specifically a kind of detection method of in the GPON system, carrying out the ONU ascending time slot collision.Concrete realization of the present invention is realized by following steps:
The first step is judged the trigger condition that ascending time slot collision takes place, and eligible 1 got into for the 2nd step, otherwise changeed for the 6th step;
Second step close ONUi, and whether the failure judgement phenomenon disappeared, if fault disappears, changed for the 3rd step over to, otherwise i=i-1 is (if i=0 i=max), repeated for second step;
In the 3rd step, open ONUi again;
In the 4th step,, otherwise changeed for the 9th step if fault recurrence changeed for the 5th step;
The 5th step reported webmaster ONUi ascending time slot collision to occur, closed ONUi, changeed for the 9th step;
In the 6th step, (if i=0, i=max), and whether the failure judgement phenomenon disappear, if fault disappears, changed for the 7th step over to, otherwise i=i-1 repeated for the 6th step to close ONUi-1;
The 7th step, open ONUi-1 again, if fault recurrence changeed for the 8th step, otherwise changeed for the 9th step;
The 8th step reported webmaster ONUi-1 ascending time slot collision to occur, closed ONUi-1;
The 9th step judged whether to also have the ONU that conflicts, if having, changeed the first step, otherwise finished to return.
Below in conjunction with accompanying drawing, according to the order of accompanying drawing the enforcement of technical scheme is done further to describe in detail basically.
Fig. 3 is normal ONU ascending time slot transmission figure, and dash area is time slot protection interval among the figure.
Fig. 4 is the sketch map of time slot collision between two adjacent ONU, and the laser shut-in time prolongation of an ONU causes and ascending time slot collision takes place follow-up ONU, and the figure left part is divided into normal ascending time slot and transmits, the situation for clashing on the right of scheming.
Fig. 5 is that the laser of an ONU continues luminous causing and follow-up a plurality of or all ONU generation ascending time slot collisions, and the figure left part is divided into normal ascending time slot and transmits, and figure the right is a situation about clashing.
Fig. 6 is the realization flow figure of the inventive method, the digital corresponding above-mentioned performing step among the figure.
According to the situation of ONU ascending time slot collision, the condition that the present invention carries out the triggering of ascending time slot collision judgement has following several kinds:
1) the OLT burst length that detects ONUi surpasses allocated length, and can't be normal through the EqD adjustment.
2) n (>=1) individual ONUi produces the LOFi/SFi signal, and the ONUi state is normal when finding range again.
3) n (>=1) individual ONUi ERRi increases in continuous multiple frames, and again the range finding during the time ONUi ERRi normal.
In sum, the present invention utilizes the alarm and the performance data of standard definition, through close one by one maybe ONU mode realize the detection and the decision-making function of ascending time slot collision, be a kind of method that realizes that the simple GPON ONU of system ascending time slot collision detects.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. the detection method of an ascending time slot collision of optical network unit is characterized in that, may further comprise the steps:
Step S102, optical line terminal detects the triggering of ascending time slot collision of optical network unit, if the ascending time slot collision of optical network unit ONU i satisfies first trigger condition; Then proceed to step S104; If the ascending time slot collision of optical network unit ONU i satisfies second trigger condition, then proceed to step S110, wherein; I is a natural number, is the numbering of optical network unit ONU;
Wherein, said first trigger condition comprises that the burst length that optical line terminal detects ONUi surpasses allocated length, and can't be normal through balanced time-delay EqD adjustment;
Said second trigger condition comprises that one or more ONUi produce LOF LOFi/ Signal Fail indication SFi signal; And the ONUi state is normal when finding range again; Perhaps one or more ONUi error rate ERRi increase in continuous multiple frames, and again the range finding during the time ONUi ERRi normal;
Step S104 closes optical network unit ONU i, and whether failure judgement disappears, if disappear, then proceeds to step S106, if do not disappear, then makes i=i-1, returns execution in step S104, wherein, then makes i become maximum numbering by i=0 if i=i-1 makes;
Step S106 opens optical network unit ONU i again, if fault recurrence then proceeds to step S108, otherwise proceeds to step S116;
Step S108 reports webmaster optical network unit ONU i ascending time slot collision to occur, closes optical network unit ONU i, proceeds to step S116;
Step S110 closes optical network unit ONU i-1, and whether failure judgement disappears, if disappear, then proceeds to step S112, if do not disappear, then makes i=i-1, returns execution in step S110, wherein, then makes i become maximum numbering by i=0 if i=i-1 makes;
Step S112 opens optical network unit ONU i-1 again, if fault recurrence then proceeds to step S114, otherwise proceeds to step S116;
Step S114 reports webmaster optical network unit ONU i-1 ascending time slot collision to occur, closes optical network unit ONU i-1;
Step S116 judges also to have ascending time slot collision of optical network unit, if then proceed to step S102, otherwise finish.
2. the detection system of an ascending time slot collision of optical network unit is characterized in that, comprising:
Optical line terminal is used to detect the triggering of ascending time slot collision of optical network unit;
First locating module is positioned at said optical line terminal side, is used for satisfying under the situation of first trigger condition at the ascending time slot collision of optical network unit ONU i, closes optical network unit ONU i; Whether failure judgement disappears, if do not disappear, then makes i=i-1, closes optical network unit ONU i; Disappear up to fault, open optical network unit ONU i again, if fault recurrence then reports webmaster optical network unit ONU i ascending time slot collision to occur; Close optical network unit ONU i, wherein, i is a natural number; Be the numbering of optical network unit ONU, then make i become maximum numbering by i=0 if i=i-1 makes;
Wherein, said first trigger condition comprises that the burst length that optical line terminal detects ONUi surpasses allocated length, and can't be normal through balanced time-delay EqD adjustment;
Said second trigger condition comprises that one or more ONUi produce LOF LOFi/ Signal Fail indication SFi signal; And the ONUi state is normal when finding range again; Perhaps one or more ONUi error rate ERRi increase in continuous multiple frames, and again the range finding during the time ONUi ERRi normal; Second locating module is positioned at said optical line terminal side, is used for satisfying under the situation of second trigger condition at the ascending time slot collision of optical network unit ONU i, closes optical network unit ONU i-1; Whether failure judgement disappears, if do not disappear, then makes i=i-1; Close optical network unit ONU i-1, disappear, open optical network unit ONU i-1 again up to fault; If fault recurrence then reports webmaster optical network unit ONU i-1 ascending time slot collision to occur, close optical network unit ONU i-1; Wherein, if making, i=i-1 then makes i become maximum numbering by i=0.
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| CN2007100008821A CN101222278B (en) | 2007-01-12 | 2007-01-12 | Method and system for detecting uplink time slot conflict of optical network unit |
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| CN101414932B (en) * | 2007-10-15 | 2012-09-05 | 华为技术有限公司 | Method, system and apparatus managing alarm of long-distance passive optical network system |
| CN103297128A (en) * | 2013-06-17 | 2013-09-11 | 苏州优康网络电子商务有限公司 | Detection device for light conflicts |
| CN104811240B (en) * | 2014-01-28 | 2017-09-01 | 中国电信股份有限公司 | Detect the method and OLT of abnormal luminous ONU in PON system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6108112A (en) * | 1997-03-19 | 2000-08-22 | Fujitsu Limited | Method and apparatus for failure recovery in passive optical network |
| JP2004112746A (en) * | 2002-07-22 | 2004-04-08 | Sumitomo Electric Ind Ltd | PON (Passive Optical Network) system |
| CN1512648A (en) * | 2002-12-30 | 2004-07-14 | 张凤林 | Self-operated environment protection motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6108112A (en) * | 1997-03-19 | 2000-08-22 | Fujitsu Limited | Method and apparatus for failure recovery in passive optical network |
| JP2004112746A (en) * | 2002-07-22 | 2004-04-08 | Sumitomo Electric Ind Ltd | PON (Passive Optical Network) system |
| CN1512648A (en) * | 2002-12-30 | 2004-07-14 | 张凤林 | Self-operated environment protection motor |
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