CN101656573A - Method and optical line terminal for protecting passive optical network service - Google Patents
Method and optical line terminal for protecting passive optical network service Download PDFInfo
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Abstract
The invention discloses a method and optical line terminal for protecting passive optical network(PON) service. The method comprises that an optical line terminal OLT detects polledly ports of PON, ifa PON ports is adjusted fault, the OLT adjusts the fault is main fault or branch fault; if branch fault, the fault branch ONU is switched to a spare PON port of the OLT. Through the invention, when abranch fiber is disconnected in ODN, only the ONU connected with the branch fiber is switched, thereby achieving the aim that the switch of ONU does not influence other ONU services.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of method and optical line terminal of passive optical network service protection.
Background technology
Along with the rapid growth of Access Network to the service bandwidth demand, the development of optical communication technique and the reduction of cost, optical fiber communication is transparent to business with it, life-span is long, the bandwidth bearing capacity is almost unlimited, the characteristics that can adapt to ever-increasing bandwidth and new business growth requirement, and become the important way that access layer network is built, " light advances copper and moves back ", optical node progressively moves down, FTTP (FTTP:Fiber To The Premise), Fiber To The Building (FTTB:Fiber To The Building), Fiber-To-The-Office (FTTO:Fiber To The Office) and optical fiber have become a kind of trend of access layer network development until to family (FTTH:Fiber To The Home).
Secondly, the passive optical access network network disturbs, saves advantages such as computer room construction cost and reduction operation maintenance expense with its passive pressure of not powering, good environmental adaptability, no electromagnetism thunder and lightning, can finely satisfy the demand that access layer network is built.
But along with EPON (Passive Optical Network abbreviates PON as) networks development, the service protection problem becomes more and more outstanding.But this class protection all is to carry out 1: 1 protection at OLT PON port; can not protect at certain ONU; when branch optical fiber only breaks down; all ONU under the whole OLT PON port will need be switched under the spare OLT PON port, thereby the branch optical fiber fault of an ONU can influence all business of whole OLT PON port.
Fig. 1 is the PON service protection networking topology schematic diagram according to correlation technique.
The PON network generally comprises optical line terminal (Optical Line Terminal, abbreviate OLT as), optical network unit (Optical Network Unit, abbreviate ONU as) and optical distribution network (optical distribution network, abbreviate ODN as) three parts, as shown in Figure 1, be the communication system of a point to multiple spot, wherein ODN can be divided into trunk optical fiber and two parts of branch optical fiber again, the tie point of trunk optical fiber and branch optical fiber passes through separator (at time division multiple access (Time Division Multiple Access, abbreviate TDMA as) PON) or the mixture (at WDM mixing PON) of the channel-splitting filter (at WDM PON) of wavelength division multiplexing (Wavelength Division Multiplexing abbreviates WDM as) or separator and channel-splitting filter.
At EPON protection in the correlation technique all is to carry out 1: 1 protection at OLT PON port; can not protect at certain ONU; when branch optical fiber only breaks down; all ONU under the whole OLT PON port to need be switched under the spare OLT PON port; thereby the branch optical fiber fault of an ONU can influence all professional problems of whole OLT PON port, does not propose effective solution at present as yet.
Summary of the invention
At EPON protection in the correlation technique all is to carry out 1: 1 protection at OLT PON port; can not protect at certain ONU; when branch optical fiber only breaks down; all ONU under the whole OLT PON port to need be switched under the spare OLT PON port; thereby the branch optical fiber fault of an ONU can influence all professional problems of whole OLT PON port and propose the present invention; for this reason; main purpose of the present invention is to provide a kind of method and optical line terminal of passive optical network service protection, to address the above problem.
To achieve these goals, according to an aspect of the present invention, provide a kind of method of passive optical network service protection.
Method according to passive optical network service protection of the present invention comprises: the optical line terminal OLT poll detects its passive optical network PON port, breaks down if judge the PON port, and then the OLT failure judgement is trunk fault or branch's fault; If fault is branch's fault, then the branched optical networks unit ONU that breaks down is switched to the standby PON port working of OLT.
Preferably; after the OLT failure judgement is trunk fault or branch's fault; said method also comprises: if fault is the trunk fault; then the PON port switching that breaks down is arrived corresponding with it standby PON port, all ONU that need protection switch to standby PON port working under the PON port that breaks down.
Preferably; all ONU that need protection switch to after the standby PON port working simultaneously under the PON port; said method also comprises: OLT sends a notification message to the ONU that all need protection, and wherein, notification message is used to indicate OLT that the PON port switching has taken place.
Preferably, after the business with the ONU of branch switched to the standby PON port working of OLT, said method also comprises: OLT sent a notification message to the ONU of branch, and wherein, notification message is used to indicate OLT to take place to switch at the logic business of the ONU of branch business.
Preferably, if fault is branch's fault, said method also comprises: whether the ONU that the branch of failure judgement connects needs protection; If the ONU that the branch of fault connects does not need protection, then do not protect.
Preferably, said method also comprises: detect the PON port of ONU, judge whether the PON port of ONU breaks down; If the PON port of ONU breaks down, then the PON port switching is arrived standby PON port working.
Preferably, after the PON port switching was arrived standby PON port working, said method also comprises: ONU sent a notification message to OLT, and wherein, notification message is used to indicate ONU that switching of PON port taken place.
Preferably, the PON port that detects ONU only detects the ONU that needs protection.
To achieve these goals, according to a further aspect in the invention, provide a kind of optical line terminal.
Optical line terminal according to the embodiment of the invention comprises: detection module is used for poll and detects its passive optical network PON port; First judge module, if the PON port breaks down, being used for failure judgement is trunk fault or branch's fault; Handover module is used for the business of branched optical networks unit is switched to the standby PON port working of optical line terminal.
Preferably, above-mentioned optical line terminal also comprises: second judge module, when fault was branch's fault, whether the optical network unit that is used for branch's connection of failure judgement needed protection.
By the present invention, adopt the optical line terminal OLT poll to detect its PON port, break down if judge the PON port, then the OLT failure judgement is trunk fault or branch's fault; If fault is branch's fault; then the ONU of branch that breaks down is switched to the standby PON port working of OLT; having solved the EPON protection all is to carry out 1: 1 protection at OLT PON port; can not protect at certain ONU; when branch optical fiber only breaks down; all ONU under the whole OLT PON port to need be switched under the spare OLT PON port; thereby the branch optical fiber fault of an ONU can influence all professional problems of whole OLT PON port; and then reached when having only certain branch optical fiber to interrupt among the ODN; only switch the ONU that this branch optical fiber connects, thereby make switching of this ONU not influence the effect of other ONU business.
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 PON service protection networking topology schematic diagram according to correlation technique;
Fig. 2 is the PON service protection networking topology schematic diagram according to the embodiment of the invention;
Fig. 3 is the flow chart according to the method for the passive optical network service protection of the embodiment of the invention;
Fig. 4 switches the flow chart of processing according to the preferred OLT protection of the embodiment of the invention;
Fig. 5 switches the flow chart of processing according to the preferred ONU protection of the embodiment of the invention;
Fig. 6 is the schematic diagram according to the optical line terminal of the embodiment of the invention.
Embodiment
Functional overview
Consider that the EPON protection all is to carry out 1: 1 protection at OLT PON port; can not protect at certain ONU; when branch optical fiber only breaks down; all ONU under the whole OLT PON port to need be switched under the spare OLT PON port; thereby the branch optical fiber fault of an ONU can influence all professional problems of whole OLT PON port, and the embodiment of the invention provides a kind of method and optical line terminal of passive optical network service protection.This method comprises: the optical line terminal OLT poll detects its PON port, breaks down if judge the PON port, and then the OLT failure judgement is trunk fault or branch's fault; If fault is branch's fault, then the ONU of branch that breaks down is switched to the standby PON port working of OLT.
The present invention has realized a kind of PON guard method; this guard method can be carried out the protection of trunk optical fiber and branch optical fiber to the PON network respectively; when trunk optical fiber among the ODN interrupts; this method carries out switching based on the protection of OLT PON port; the business that realizes the PON port is switched; make the business of whole PON port can be switched to very soon on the standby PON port; when branch optical fiber among the ODN interrupts; this method carries out switching based on the protection of ONU; the business that realizes this ONU is switched; the business of this ONU is switched on the standby PON port, make switching of this ONU not influence other ONU.
Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Method embodiment
According to embodiments of the invention, provide a kind of method of passive optical network service protection.
As shown in Figure 3, this method comprises that following step S302 is to step S304:
Step S302, optical line terminal OLT poll detect its PON port, break down if judge the PON port, and then the OLT failure judgement is trunk fault or branch's fault;
Step S304 if fault is branch's fault, then switches to the ONU of branch that breaks down the standby PON port working of OLT.
Be described in detail below in conjunction with the implementation procedure of example the embodiment of the invention.
The present invention includes a PON service protection networking topology and OLT protection switches handling process and ONU protection and switches handling process.
Fig. 2 is the PON service protection networking topology schematic diagram according to the embodiment of the invention.
As shown in Figure 2, PON service protection networking topology can be as follows:
Provide a kind of OLT equipment according to the embodiment of the invention; wherein; OLT equipment has several OLT PON ports; wherein can be subdivided into protected PON port and protection PON port again; such as the OLT PON port one among Fig. 2 and 3 is protected PON port; port 2 is protection PON port, and PON port 2 is protected PON port one and 3 simultaneously.OLT PON port is connected with ONU by trunk optical fiber, separator/channel-splitting filter, branch optical fiber respectively, and wherein there are two PON ports in part of O NU, belongs to the protected ONU of needs, and part of O NU has only a PON port, and this ONU does not protect.Need protected ONU by two PON ports and be connected respectively to two OLT PON ports by two independent ODN passages and get on.Such as the ONU1 among Fig. 2; 6 do not need protection, ONU2,3; 4; 5 need protection, ONU2 wherein, 3; 4 PON port one has been connected to OLT PON port one; ONU PON port 2 has been connected to OLT PON port 2, and the PON port one of ONU5 has been connected to OLT PON port 2, and the PON port 2 of ONU5 has been connected to OLT PON port 3.
In protection relation that need before the PON protection is switched to implement human configuration OLT PON port, determine that promptly which PON port is protected port, which port is the protection port, needs which ONU of human configuration to need protection.Protected and the protection PON port of OLT and ONU is all in running order, but protected PON port is in the main operating state of using, and protection PON port is in standby operating state.
The protection of artificial earlier configuration OLT PON port concerns before enforcement PON protection is switched, and as shown in Figure 2, configuration PON port 2 is the PON port one; 3 protection PON port, human configuration ONU2,3; 4,5 for needing protection, wherein ONU2; 3; 4 PON port one is connected under the OLT PON port one, ONU2,3; 4 PON port 2 and the PON port one of ONU5 are connected OLT PON port 2 times, and the PON port 2 of ONU5 is connected OLT PON port 3 times.Protected and the protection PON port of OLT and ONU is all in running order, but protected PON port is in the main operating state of using, and protection PON port is in standby operating state.
Fig. 4 switches the flow chart of processing according to the preferred OLT protection of the embodiment of the invention.
As shown in Figure 4, according to the OLT of the embodiment of the invention protection to switch handling process as follows:
Step S401, poll detect protected OLT PON port.
Step S402, judge whether to break down, judgment mode can be to detect dropout (Loss Of Signal, abbreviate LOS as), dropout taken place in LOSi (certain (i) ONU) etc. fibre circuit alarm, PON ply-yarn drill fault etc., it also can be fault warning of reporting by variety of way of ONU etc., if WDM PON or WDM mixing PON then also comprise detecting wavelength fault etc.
Step S403, break down if confirm, then further judge it is trunk fault or branch's fault, detect all ONU such as OLT PON port LOSi alarm or fault warning all take place, and OLT PON port detects LOS, and PON ply-yarn drill fault or the like, if WDM PON or WDM mixing PON, then also comprise and detect all wavelengths fault etc. under this OLT PON port, then think the trunk fault, otherwise think branch's fault, detect a LOSi alarm or fault warning such as OLT PON port, perhaps detect certain wavelength fault or the like, it also may be several that the detected branch of OLT PON port fault may be one.Certain wavelength fault means attached to all ONU on this wavelength fault has all taken place in WDM mixing PON.
Step S404; if the trunk fault such as OLT PON port one generation trunk fault, then arrives corresponding with it protection PON port with protected PON port switching; be about to OLT PON port one and be switched on the OLT PON port 2, it is the main operating state of using that OLT PON port 2 is switched.
Step S405, all ONU that need protection under simultaneously will this protected PON port switch to simultaneously on the protection PON port and work and transmitting and receiving service, are about to the ONU2 under the OLTPON port one, and 3,4 switch on the OLT PON port 2 and work and transmitting and receiving service.
Step S406, and notice ONU, informing that PON port switching (switching herein can be meant switching of logic business) takes place OLT, can also can be other self-defining modes (such as by embedding the information of application layer) notices by embedding the information notice of link layer.
Step S407, if branch's fault judges then whether the ONU that this branch connects needs protection, if the ONU of this branch does not need protection, such as, the ONU that this branch connects is ONU1, does not then protect.
Step S408, protection if desired then switches to the business of this ONU on the protection PON port of OLT and works and transmitting and receiving service.Such as, the ONU that this branch connects is ONU2, then the business of ONU2 is switched on the PON port 2 of OLT to work and transmitting and receiving service.
Step S409, and notice ONU inform that OLT takes place to switch at the logic business of this ONU business, can notify by the information that embeds link layer, and also can be that other self-defining modes are notified, finish.
When fiber break takes place when, by above-mentioned notification procedure, no matter be that trunk optical fiber or branch optical fiber interrupt, OLT can both in time detect with the ONU that branch optical fiber was connected that breaks down fiber failure has taken place, if but optical fiber interrupts, but the receiver module of OLT breaks down, this moment, OLT need carry out port switching, the OLT sending module is an operate as normal in this case, therefore ONU can receive the information that sends over from OLT, and ONU can't judge OLT by the detection of self and take place to switch, and OLT should notify ONU in these cases, inform that fault has taken place OLT, has switched.
Fig. 5 switches the flow chart of processing according to the preferred ONU protection of the embodiment of the invention.
As shown in Figure 5, to switch handling process as follows for ONU protection:
The ONU that only needs protection carries out the ONU protection and switches handling process.
Step S502 detects protected PON port.
Step S504 judges whether to break down, and such as detecting whether the LOS alarm takes place, and perhaps detects protection PON ply-yarn drill fault, or receives signalling trouble that OLT informs etc.
Step S506, if break down, then with protected PON port switching to protection PON port, break down such as the protected PON port one of ONU2, then the PON port one with ONU2 is switched to PON port 2, promptly to switch be the main operating state of using to PON port 2.
Step S508 simultaneously also switches to related service on the protection PON port and to work and transmitting and receiving service, and promptly to the OLT registration, business switches to transmitting-receiving on the PON port 2 to ONU2 by PON port 2.And, also can notify OLT by other self-defined modes by in link layer, embedding relevant information, inform that this ONU breaks down to switch.
As can be seen from the above description, the present invention has realized following technique effect:
The switching of logic business of switching of OLT PON port and the ONU of branch business supported in PON guard method of the present invention simultaneously.
When having only certain branch optical fiber to interrupt among the ODN; this method carries out switching based on the protection of the logic business of the ONU of branch business (ONU rank); only switch the ONU that this branch optical fiber connects; the PON port of other ONU and OLT is not switched, and makes switching of this ONU not influence the business of other ONU.
Can realize that by method of the present invention the protection PON port of an OLT can be simultaneously protects the ONU of the protected PON port of a plurality of OLT.
Device embodiment
According to embodiments of the invention, provide a kind of optical line terminal.
The method that can be used to realize above-mentioned passive optical network service protection according to the optical line terminal of the embodiment of the invention.
Fig. 6 is the schematic diagram according to the optical line terminal of the embodiment of the invention.
As shown in Figure 6, this device comprises: detection module 601, first judge module 603, handover module 605, this device can comprise second judge module 607.
Particularly, detection module 601 is used for poll and detects its PON port; First judge module 603 if described PON port breaks down, is used to judge that described fault is trunk fault or branch's fault; Handover module 605 is used for the business of the ONU of branch is switched to the standby PON port working of described OLT; Second judge module 607 when described fault is branch's fault, is used to judge whether the ONU that the branch of described fault connects needs protection.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and 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 (10)
1. a passive optical network service guard method is characterized in that, comprising:
The optical line terminal OLT poll detects its passive optical network PON port, breaks down if judge described PON port, and then described OLT judges that described fault is trunk fault or branch's fault;
If described fault is branch's fault, then the branched optical networks unit ONU that breaks down is switched to the standby PON port working of described OLT.
2. method according to claim 1 is characterized in that, after described OLT judged that described fault is trunk fault or branch's fault, described method also comprised:
If described fault is the trunk fault, then the PON port switching that breaks down is arrived corresponding with it standby PON port, all ONU that need protection switch to standby PON port working under the described PON port that breaks down.
3. method according to claim 2 is characterized in that, all ONU that need protection switch to after the standby PON port working simultaneously under described PON port, and described method also comprises:
Described OLT sends a notification message to the ONU that all need protection, and wherein, described notification message is used to indicate described OLT that the PON port switching has taken place.
4. method according to claim 1 is characterized in that, after the business with the described ONU of branch switched to the standby PON port working of described OLT, described method also comprised:
Described OLT sends a notification message to the described ONU of branch, and wherein, described notification message is used to indicate described OLT to take place to switch at the logic business of the described ONU of branch business.
5. method according to claim 1 is characterized in that, if described fault is branch's fault, described method also comprises:
Whether the ONU that judges branch's connection of described fault needs protection;
If the ONU that the branch of described fault connects does not need protection, then do not protect.
6. according to each described method in the claim 1 to 5, it is characterized in that described method also comprises:
Detect the PON port of described ONU, judge whether the PON port of described ONU breaks down;
If the PON port of described ONU breaks down, then described PON port switching is arrived standby PON port working.
7. method according to claim 6 is characterized in that, after described PON port switching was arrived standby PON port working, described method also comprised:
Described ONU sends a notification message to described OLT, and wherein, described notification message is used to indicate described ONU that switching of PON port taken place.
8. method according to claim 6 is characterized in that, the PON port that detects described ONU only detects the ONU that needs protection.
9. an optical line terminal is characterized in that, comprising:
Detection module is used for poll and detects its passive optical network PON port;
First judge module if described PON port breaks down, is used to judge that described fault is trunk fault or branch's fault;
Handover module is used for the business of branched optical networks unit is switched to the standby PON port working of described optical line terminal.
10. optical line terminal according to claim 9 is characterized in that, described optical line terminal also comprises:
Second judge module when described fault is branch's fault, is used to judge whether the optical network unit that the branch of described fault connects needs protection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910171684A CN101656573A (en) | 2009-09-07 | 2009-09-07 | Method and optical line terminal for protecting passive optical network service |
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| CN200910171684A CN101656573A (en) | 2009-09-07 | 2009-09-07 | Method and optical line terminal for protecting passive optical network service |
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| CN106452571A (en) * | 2016-10-12 | 2017-02-22 | 国网江苏省电力公司徐州供电公司 | Power terminal communication access network topology dependent failure section determination and analysis methods |
| CN106452571B (en) * | 2016-10-12 | 2018-11-30 | 国网江苏省电力公司徐州供电公司 | Electric power terminal communication access net topological relation faulty section determines and analysis method |
| CN112218179A (en) * | 2019-07-09 | 2021-01-12 | 中兴通讯股份有限公司 | Service protection method, device and system |
| CN112218179B (en) * | 2019-07-09 | 2023-05-09 | 中兴通讯股份有限公司 | Service protection method, device and system |
| CN113794959A (en) * | 2021-10-20 | 2021-12-14 | 深圳市天威网络工程有限公司 | PON network fault automatic positioning method and system |
| CN113794959B (en) * | 2021-10-20 | 2024-01-09 | 深圳市天威网络工程有限公司 | PON network fault automatic positioning method and system thereof |
| CN115484267A (en) * | 2022-09-15 | 2022-12-16 | 中国联合网络通信集团有限公司 | Multi-cluster deployment processing method and device, electronic equipment and storage medium |
| CN115484267B (en) * | 2022-09-15 | 2024-09-17 | 中国联合网络通信集团有限公司 | Multi-cluster deployment processing method and device, electronic equipment and storage medium |
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