CN100571079C - The normal failure light emission of Ethernet passive optical network terminal detects and localization method - Google Patents
The normal failure light emission of Ethernet passive optical network terminal detects and localization method Download PDFInfo
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- CN100571079C CN100571079C CNB2007100060093A CN200710006009A CN100571079C CN 100571079 C CN100571079 C CN 100571079C CN B2007100060093 A CNB2007100060093 A CN B2007100060093A CN 200710006009 A CN200710006009 A CN 200710006009A CN 100571079 C CN100571079 C CN 100571079C
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Abstract
The invention provides a kind of fault location and detection method, be used on the local side apparatus of Ethernet passive optical network detecting automatically and the normal failure light emission of positioning terminal equipment, this method may further comprise the steps: step S202, periodically check the login state of the terminal equipment on the local side apparatus and the luminous power that local side apparatus receives, whether normal failure light emission takes place to judge terminal equipment; And step S204, if normal failure light emission for taking place in judged result, then close the terminal equipment at local side apparatus place and find process, and send the luminous instruction of pressure successively, come the terminal equipment of fault location according to the luminous power of local side apparatus reception to all terminal equipments.Therefore, shorten the recovery time of Ethernet passive optical network in such fault greatly, improved the network operation efficient of Ethernet passive optical network.
Description
Technical field
The present invention relates to passive optical network (XPON), more specifically, the present invention relates to a kind of fault detect and localization method that is used for going up the normal failure light emission of detection automatically and positioning terminal equipment (referring to optical network unit ONU) at the local side apparatus (referring to optical line terminal OLT) of Ethernet passive optical network (EPON).
Background technology
The EPON technology is the emerging broadband passive optical network technology based on Ethernet.Its essence is the extension of Ethernet in the Access Network field.EPON is the one-to-many structure on physical topology, then is structure one to one in logic.Its downlink data is transmitted as broadcasting method, and all optical network units (ONU) can both receive all downlink data frames on its physics PON mouth.Up then is time division multiple access (TDMA) mode, and each ONU is transmission upstream data in optical line terminal (OLT) be the uplink authorization time slot of its distribution only.
With other PON technology types that adopt up TDMA access way seemingly, EPON also faces a serious safety problem.If promptly there is an ONU ceaselessly to send uplink optical signal because of certain reason, the normal data that every other ONU is sent can't be resumed out at the OLT place, also just can't successfully be registered on the OLT, this means the collapse of EPON network.In case so normal failure light emission occurs, the serious and abort situation of consequence is difficult to the location.
At present, general method is that ONU is closed according to this, looks at it is on other ONU can register when closing which ONU.The shortcoming of this manual method is: generally, each ONU that OLT hangs down geographically relatively disperses mostly, and is also distant with the distance of OLT.When a lot of ONU, it is pretty troublesome to operate, and wastes time and energy.As seen, be necessary to adopt new method to address this problem better.Yet, up to the present, also do not see the report of correlation technique.
Therefore, need a kind of fault detect and localization method, to address the above problem.
Summary of the invention
In order to address the above problem, the invention provides a kind of fault detect and localization method, thereby make the normal failure light emission that can automatically detect ONU in EPON OLT side, and can also orient simultaneously to be the fault which ONU causes.
To achieve these goals, the invention provides a kind of fault detect and localization method, be used on the local side apparatus of Ethernet passive optical network detecting automatically and the normal failure light emission of positioning terminal equipment, this method may further comprise the steps: step S202, periodically check the luminous power of the login state and the terminal equipment that local side apparatus receives of the terminal equipment on the local side apparatus, whether normal failure light emission has taken place to judge terminal equipment; And step S204, if normal failure light emission for having taken place in judged result, then close the terminal equipment at local side apparatus place and find process, and send the luminous instruction of pressure successively, locate the terminal equipment that breaks down according to the luminous power that local side apparatus receives to all terminal equipments.
According to the present invention, step S202 may further comprise the steps: whether step S302, periodic test have terminal equipment to be registered on the local side apparatus; Step S304 if all terminal equipments all do not have registration, then checks the luminous power that local side apparatus receives; Step S306, device discovery process and delay predetermined time if luminous power greater than the receiving sensitivity of local side apparatus, is then closed a terminal; And step S308, detect the luminous power that local side apparatus receives once more, if, then define terminal equipment normal failure light emission taken place still greater than the receiving sensitivity of local side apparatus, and record detected luminous power this moment.
In step S306, the scheduled time is used for waiting for that finishing previous terminal equipment finds process.
In step S308, also comprise: send to webmaster normal failure light emission alarm takes place.
In addition, according to the present invention, before execution in step S204, the relevant information when on local side apparatus, preserving the terminal equipment operate as normal.
According to embodiments of the invention, the relevant information during the terminal equipment operate as normal comprises: the received optical power of medium access control address, two-way time and local side apparatus.
In step S204, may further comprise the steps: step S402, when detecting the normal failure light emission of appearance, close the terminal equipment of local side apparatus and find process; S404, local side apparatus send to a terminal equipment and force luminous instruction, time-delay two-way time, detect luminous power that local side apparatus receives and the value that writes down this luminous power again; Step S406, behind the delay predetermined time, repeating step S404, up to the optical power value of all terminal equipments of record, device discovery process again opens a terminal; And step S408, each optical power value that is write down and the optical power value that writes down in step S308 are compared, if their difference, thinks then that normal failure light emission appears in this terminal equipment less than threshold value.
According to the present invention, force the frame format of luminous instruction to be: LLID is the broadcasting LLID of syntype; The purpose medium access control address is the medium access control address of terminal equipment; The source medium access control address is the medium access control address of local side apparatus; Type/length field is customization type OxFFFF; Command code is 1, and expression forces the optical transceiver of terminal equipment luminous; And operating parameter is N, and the expression fluorescent lifetime is N TQ, and the equipment of closing a terminal after N TQ is luminous, wherein, and 1TQ=16ns.
In step S404, after terminal equipment received the luminous instruction of pressure, also comprise: the value of the local timer of terminal equipment was set to N; The open a terminal transmission of optical transceiver of equipment; And behind timer expiry, the transmission of the optical transceiver of the equipment of closing a terminal.
According to embodiments of the invention, the scheduled time is M TQ, and, M＞N.
In addition, threshold value is half of minimum value of the normal light power that receives from all terminal equipments of the local side apparatus of precedence record, and local side apparatus is an optical line terminal, and terminal equipment is an optical network unit.
Therefore, adopt this method, can automatically detect the normal failure light emission of optical network unit, and can also to orient simultaneously be the fault which optical network unit causes in the optical line terminal side of Ethernet passive optical network.Thus, shorten the recovery time of Ethernet passive optical network in such fault greatly, improved the network operation efficient of Ethernet passive optical network.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is EPON system topological figure;
Fig. 2 is the flow chart according to fault detect of the present invention and localization method;
Fig. 3 is the flow chart of detection failure according to an embodiment of the invention; And
Fig. 4 is the flow chart of fault location ONU according to an embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
Fig. 1 is EPON system topological figure.As can be seen from the figure, can pass through optical splitter 104 a plurality of ONU 106 under the PON mouth of an OLT 102.From the downlink data load mode of OLT 102 to ONU106 is time division multiplexing and physical layer broadcast mode, and promptly each downlink frame can send to the PON port of all ONU 106, is the TDMA mode from the upstream data load mode of ONU 106 to OLT102.
Fig. 2 is the flow chart according to fault detect of the present invention and localization method, and as shown in Figure 2, fault detect and localization method may further comprise the steps:
Step S202 periodically checks the login state of the terminal equipment on the local side apparatus and the luminous power that local side apparatus receives, and to judge terminal equipment whether normal failure light emission takes place; And
Step S204 finds process if judged result, is then closed the terminal equipment at local side apparatus place for normal failure light emission takes place, and sends the luminous instruction of pressure successively to all terminal equipments, comes the terminal equipment of fault location according to the luminous power of local side apparatus reception.
It is to be noted, before execution in step S204, relevant information when on local side apparatus, preserving the terminal equipment operate as normal, and the relevant information during the terminal equipment operate as normal comprises: the luminous power that medium access control address, two-way time and local side apparatus receive.
Embodiment hereinafter with reference to Fig. 3 and Fig. 4 describes above steps in more detail, and Fig. 3 is the flow chart of detection failure step S204 according to an embodiment of the invention.
As shown in Figure 3, in this detection failure process S204, periodically check whether have ONU to be registered on the OLT by a process on the software.If certain one-period finds do not have ONU to be registered on the OLT, then inquire about the received optical power of OLT optical transceiver.If this optical power value, is then closed the ONU of OLT greater than the sensitivity of receiver and found process, time-delay a period of time (as 1 second, be used for waiting for previous discovery window finish), inquire about the received optical power of OLT optical transceiver again.If the optical power value that obtains is still greater than the sensitivity of receiver, then can conclude has ONU that fault has taken place, and its optical transceiver is sending light signal, i.e. Chang Faguang always.At this moment, the optical power value P that record records reports normal failure light emission alarm to webmaster then.Its concrete steps are as follows:
Whether step S302, periodic test have terminal equipment to be registered on the local side apparatus;
Step S304 if all terminal equipments all do not have registration, then checks the luminous power that local side apparatus receives;
Step S306, device discovery process and delay predetermined time if luminous power greater than the receiving sensitivity of local side apparatus, is then closed a terminal; And
Step S308 detects the luminous power that local side apparatus receives once more, if, determine that then normal failure light emission takes place terminal equipment still greater than the receiving sensitivity of local side apparatus, and recording optical power.
In addition, Fig. 4 is the flow chart of the process S404 of fault location ONU according to an embodiment of the invention.In the process S404 of as shown in Figure 4 fault location ONU, the ONU that breaks down in the location requires OLT to go up the relevant information of each ONU when preserving operate as normal, comprising: MAC Address, RTT and the luminous power when arriving OLT.Be checked through the normal failure light emission of ONU appears and after, the ONU that continues to close OLT finds process, to guarantee not having ONU to send upstream data.Send to each ONU according to this then and force luminous instruction.
The frame format of this instruction is defined as follows: the LLID of frame preamble part adopts broadcasting LLID, pattern is a syntype, the target MAC (Media Access Control) address of frame head is the MAC Address of target ONU, source address is the MAC Address of OLT, and type/length field is customization type 0xFFFF, and command code is 1, expression forces optical transceiver luminous, operating parameter is N, and the expression fluorescent lifetime is N TQ (1TQ=16ns), and N the TQ transmission of optical transceiver afterwards closed.The N here can pass through network management configuration, and N can get 62500000 (1 seconds) during specific implementation.The ONU side need respond this instruction, promptly receive this instruction after, as local timer fixed time interval, and force optical transceiver luminous N by instruction, behind timer expiry, it is closed.
In the OLT side, when issue the luminous instruction of pressure to certain ONU after, need time-delay a period of time (equaling the RTT value corresponding) with this ONU, detect the received optical power of OLT optical transceiver again.For the purpose of accurately, should average in N TQ repeatedly inquiry (as 3 times) in the time interval.The optical power value that record records.Delaying time then, (M＞N) sent to next ONU and to force luminous instruction, detects the received optical power and the record of OLT optical transceiver again time of M TQ.Repeat aforesaid operations,, open ONU afterwards and find process up to having traveled through all ONU.
The P that obtains during with the optical power value of each ONU correspondence of obtaining and detection failure compares, if the difference of a certain optical power value and P can assert then that less than half to the received optical power of ONU of any OLT of record before all fault has taken place this ONU.Analysis result is noted, and reported webmaster.
The process of above-mentioned fault location ONU has a prerequisite: promptly all ONU have started, if there is ONU to be not activated, according to above-mentioned Fault Locating Method, also can be considered to take place normal failure light emission.At this moment, just need exclude the ONU that these do not start, just can navigate to real faulted ONU by follow-up artificial enquiry mode.
To sum up, the method for fault location as shown in Figure 4 comprises following steps as shown in Figure 4:
Step S402 when detecting the normal failure light emission of appearance, closes the terminal equipment of local side apparatus and finds process;
Step S404, local side apparatus send to a terminal equipment and force luminous instruction, delay time two-way time the luminous power that the optical transceiver in the detection local side apparatus receives and the value of recording optical power;
Step S406, behind the delay predetermined time, repeating step S402, up to the optical power value of all terminal equipments of record, the device discovery process opens a terminal; And
Step S408 compares each optical power value that is write down and the optical power value that writes down, if their difference, thinks then that normal failure light emission appears in terminal equipment less than threshold value in step S308.
In sum, by the present invention, can detect the normal failure light emission of optical network unit in the optical line terminal side of Ethernet passive optical network automatically, and can also orient simultaneously is the fault which optical network unit causes, thereby shortened the recovery time of Ethernet passive optical network in such fault greatly, improved the network operation efficient of Ethernet passive optical network.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. fault detect and localization method are used for detecting automatically on the local side apparatus of Ethernet passive optical network and the normal failure light emission of positioning terminal equipment, it is characterized in that, may further comprise the steps:
Step S202 periodically checks the luminous power of the described terminal equipment that the login state of the described terminal equipment on the described local side apparatus and described local side apparatus receive to judge described terminal equipment whether normal failure light emission to take place; And
Step S204, if judged result, is then closed the terminal equipment at described local side apparatus place for described normal failure light emission takes place and is found process, and sends the luminous instruction of pressure successively to all terminal equipments, come the terminal equipment of fault location according to the luminous power of described local side apparatus reception
Wherein, described step S202 may further comprise the steps:
Whether step S302, periodic test have described terminal equipment to be registered on the described local side apparatus;
Step S304 if all described terminal equipments all do not have registration, then checks the luminous power that described local side apparatus receives;
Step S306 finds process if described luminous power, is then closed described terminal equipment greater than the receiving sensitivity of described local side apparatus, and delay predetermined time; And
Step S308 detects the described luminous power that described local side apparatus receives once more, if, determine that then described normal failure light emission has taken place described terminal equipment still greater than the receiving sensitivity of described local side apparatus, and record detected described luminous power this moment.
2. fault detect according to claim 1 and localization method is characterized in that, in described step S306, the described scheduled time is used for waiting for that finishing previous terminal equipment finds process.
3. fault detect according to claim 1 and localization method is characterized in that, in described step S308, also comprise:
Send the described normal failure light emission alarm of generation to webmaster.
4. fault detect according to claim 1 and localization method is characterized in that, before carrying out described step S204, and the relevant information when on described local side apparatus, preserving described terminal equipment operate as normal.
5. fault detect according to claim 4 and localization method is characterized in that, the relevant information during described terminal equipment operate as normal comprises: the luminous power of medium access control address, two-way time and the described local side apparatus of arrival.
6. fault detect according to claim 5 and localization method is characterized in that, in described step S204, may further comprise the steps:
Step S402 when detecting when described normal failure light emission occurring, closes the described terminal equipment of described local side apparatus and finds process;
Step S404, described local side apparatus sends the luminous instruction of described pressure to a described terminal equipment, delays time described two-way time, detects described luminous power that the optical transceiver in the described local side apparatus receives and the value that writes down described luminous power again;
Step S406, behind the delay predetermined time, repeating step S402 up to the described optical power value of all described terminal equipments of record, opens described terminal equipment again and finds process; And
Step S408 compares each described optical power value that is write down and the described optical power value that writes down, if their difference, thinks then that described normal failure light emission appears in described terminal equipment less than threshold value in described step S308.
7. fault detect according to claim 6 and localization method is characterized in that, the frame format of the luminous instruction of described pressure is:
LLID is the broadcasting LLID of syntype;
The purpose medium access control address is the medium access control address of described terminal equipment;
The source medium access control address is the medium access control address of described local side apparatus;
Type/length field is customization type OxFFFF;
Command code is 1, and expression forces the optical transceiver of described terminal equipment luminous; And
Operating parameter is N, and the expression fluorescent lifetime is N TQ, closes described terminal equipment after N TQ,
Wherein, 1TQ=16ns.
8. fault detect according to claim 7 and localization method is characterized in that, in described step S404, after described terminal equipment receives the luminous instruction of described pressure, also comprise:
The value of the local timer of described terminal equipment is set to N;
Open the transmission of the optical transceiver of described terminal equipment; And
Behind described timer expiry, close the transmission of the described optical transceiver of described terminal equipment.
9. fault detect according to claim 7 and localization method is characterized in that, the described scheduled time is M TQ.
10. fault detect according to claim 9 and localization method is characterized in that M＞N.
11. fault detect according to claim 6 and localization method is characterized in that, half of the described threshold value normal light power minimum that to be described local side apparatus receive from described terminal equipment.
12., it is characterized in that described local side apparatus is an optical line terminal according to each described fault detect and localization method in the claim 1 to 11, and described terminal equipment is an optical network unit.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101127567B (en) * | 2007-09-20 | 2010-12-29 | 中兴通讯股份有限公司 | A method and device for optical line terminal to detect the optical power of optical network unit |
| US8200083B2 (en) | 2008-01-03 | 2012-06-12 | Futurewei Technologies, Inc. | Burst power measurements using averaged power measurement |
| JP4700094B2 (en) * | 2008-10-24 | 2011-06-15 | 株式会社日立製作所 | Optical access system and optical line device |
| CN101814950B (en) * | 2009-02-23 | 2013-04-10 | 高通创锐讯通讯科技(上海)有限公司 | Generation mechanism for receiving optical power measurement indication signal and error protection method |
| CN101998186A (en) * | 2009-08-13 | 2011-03-30 | 中兴通讯股份有限公司 | Network protection method and device |
| CN101789824A (en) * | 2009-12-30 | 2010-07-28 | 中兴通讯股份有限公司 | Online optical network unit (ONU) optical power acquisition device and method |
| CN102148682B (en) * | 2010-02-08 | 2016-02-10 | 中兴通讯股份有限公司 | A kind of method and system that the abnormal optical network unit of luminescence is correctly located |
| CN102388548A (en) * | 2011-06-01 | 2012-03-21 | 华为技术有限公司 | Method, device and system for monitoring optical loss in optical network system |
| CN102255658B (en) * | 2011-07-05 | 2016-09-28 | 中兴通讯股份有限公司 | The method and device that a kind of 100GE ethernet signal transmits in optical transfer network |
| CN102752047B (en) * | 2012-07-27 | 2015-05-06 | 索尔思光电（成都）有限公司 | Fault detecting method and system of optical device |
| EP2882114B1 (en) | 2013-12-03 | 2016-09-14 | Alcatel Lucent | Life-cycle management of faults occuring on optical fibres |
| CN104079348A (en) * | 2014-06-20 | 2014-10-01 | 广东东研网络科技股份有限公司 | Method for detecting long-time light emitting optical network units of Ethernet passive optical network |
| CN109217917B (en) * | 2017-06-30 | 2022-05-24 | 中兴通讯股份有限公司 | Method and device for determining position of fault optical fiber, storage medium and processor |
| WO2021093186A1 (en) * | 2020-01-31 | 2021-05-20 | Zte Corporation | Fast detection and recovery of a rogue optical network unit using a reset signal |
| CN112073843A (en) * | 2020-08-17 | 2020-12-11 | 深圳市普威技术有限公司 | ONU light-emitting abnormity detection method and device, storage medium and ONU |
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