CN102740171A - Round trip detection method and system for passive optical network - Google Patents
Round trip detection method and system for passive optical network Download PDFInfo
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- CN102740171A CN102740171A CN2011100879462A CN201110087946A CN102740171A CN 102740171 A CN102740171 A CN 102740171A CN 2011100879462 A CN2011100879462 A CN 2011100879462A CN 201110087946 A CN201110087946 A CN 201110087946A CN 102740171 A CN102740171 A CN 102740171A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
- H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability
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Abstract
The invention relates to a round trip detection method. The said passive optical network employs a full protection mode ,and the said method comprises that a first OLT sends a loop correspondence message to an ONU for main use; after receiving the loop correspondence message, the ONU for main use sends the loop correspondence message to a standby ONU; after receiving the loop correspondence message sent by the standby ONU by the second OLT,the loop correspondence message is forwarded to the first OLT; and after thefirst OLT's receiving the loop correspondence message, the passive optical network is determined as a loop network. The invention also provides a loop detection method for the passive optical network. By adopting the method, the loop correspondence between the OLT and the ONU can be determined through the OLT. When main stem optical fibers or branch stem optical fibers are broken, the standby OLT notifies the ONU to perform protection inversion and the protection inversion time of the ONU can be shortened, enabling the communication message between the ONU and the OLT to be recovered quickly and improving the service quality of a PON system the correspondence between the ONU and the OLT can be recovered quickly, and the service quality of PON system is improved.
Description
Technical field
The present invention relates to the communications field, particularly a kind of EPON (Passive OpticalNetwork is called for short PON) loop detecting method and system.
Background technology
Gigabit passive optical network (GPON; Gigabit-Capable Passive Optical Network) and Ethernet passive optical network (EPON; Ethernet Passive Optical Network) is two important techniques branches in the PON family; With other PON technology type seemingly, GPON and EPON adopt the passive light access technology of point to the multidrop topology structure.
As shown in Figure 1; It is the topology diagram of PON system; PON is by the optical line terminal (OLT, Optical Line Terminal) of office's side, the optical network unit (ONU, OpticalNetwork Unit) and the Optical Distribution Network (ODN of user side; Optical Distribution Network) forms, adopt the network configuration of point usually to multiple spot.ODN is made up of Passive Optical Components such as monomode fiber, optical branching device, optical connectors, and ODN is that the physical connection between OLT and the ONU provides light-transmitting medium.
In the PON system; The transfer of data of down direction (by OLT to ONU) adopts broadcast mode; Each ONU receives all frames respectively; Again according to ONU sign (ONU-ID), G-PON Encapsulation Mode port-mark (GEM-Port ID, GPON Encapsulation Mode-Port Identity) and allocation identification (Alloc-ID, Allocation-Identity), medium access control address (MAC ID; MediumAccess Control ID) or LLID (LLID, Logical Link Identity) obtain one's own frame.For the transfer of data of up direction (from ONU to OLT) because each ONU need share transmission medium, so each ONU should be in OLT arranges transmit ascending data to the time slot of oneself.Each ONU is different with distance between the OLT, arrives OLT simultaneously for preventing the upstream data that each ONU sends, and OLT need find range synchronous to realize uplink to the ONU that is in the registration activation stage.
In the application deployment of EPON, there are certain customers to need higher fail safe, hope that operator can provide a kind of security mechanism to guarantee that its service channel does not interrupt, perhaps the requirement of time one-level is, can in service channel, have no progeny and recover fast.This has just proposed protection path and the requirement of switched path fast to the EPON that carries the customer service operation.
Fig. 2 (a) is full guard mode EPON first topology diagram, and Fig. 2 (b) is full guard mode EPON second topology diagram.Shown in Fig. 2 (a) and (b); OLT1, OLT2 are connected respectively to the ODN of two 1:N; Each ODN down direction is connected to each ONU through optical fiber respectively, and there are two ONU at each ONU place, is respectively main with ONU and subsequent use ONU; OLT1 links to each other with ONU with each master through ODN1, and OLT2 links to each other with each subsequent use ONU through ODN2; OLT1 and OLT2 can be two OLT, connect through the webmaster node, shown in Fig. 2 a; Also can be two PON mouths of OLT, shown in Fig. 2 b.During initial condition, OLT1 and all are main with carrying out service communication between the ONU, after OLT1 breaks down perhaps the fiber break between the OLT1 and optical splitter 1, carry out service communication between OLT2 and all the subsequent use ONU; If certain branch optical fiber under the optical splitter 1 interrupts, perhaps certain master is broken down with ONU, then carries out service communication by OLT2 with the branch optical fiber of interruption or the corresponding subsequent use ONU in ONU place that breaks down.Realized full guard by the way to the OLT in the PON system, ONU and every section optical fiber.In above-mentioned full guard mode, after the fiber break between OLT1 and the optical splitter 1, perhaps; Certain branch optical fiber under the optical splitter 1 interrupts, and each master detects downstream signal with ONU and interrupts, and protects then and switches; The uplink service of self is switched to subsequent use ONU; Carry out service communication between subsequent use ONU and the OLT2, in the above-mentioned protection reversed process main detect to protect after the line fault with ONU switch, this reversed process required time is longer; Can not satisfy the demand of fast quick-recovery after the time-sensitive service disconnection, prior art do not provide OLT to be used to judge and ONU between loop whether can method for communicating.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of EPON loop detecting method, uses this method, and EPON is in the restoring communication fast that breaks down under the full guard pattern between back OLT and the ONU.The present invention also provides a kind of EPON loop detection system.
For addressing the above problem, the invention provides a kind of EPON loop detecting method, said EPON adopts the full guard pattern, and said method comprises,
The one OLT sends the loop communication information to main with ONU, and the master sends to subsequent use ONU with said loop communication information after receiving said loop communication information with ONU;
The 2nd OLT is transmitted to a said OLT with said loop communication information after receiving the said loop communication information of subsequent use ONU transmission;
After the one OLT receives said loop communication information, judge that then said EPON is a loop network.
Above-mentioned method, wherein, a said OLT judges that said EPON is that loop network is specially,
The one OLT judges that said loop communication information is consistent with the loop communication information of its transmission, judges that then said passive network is a loop network.
Above-mentioned method wherein, after said master receives said loop communication information with ONU, subsequent use ONU, the 2nd OLT, is added its identity information to said loop communication information and is sent.
Above-mentioned method, wherein, a said OLT judges that said EPON is that loop network is specially,
The one OLT judges then that according to the identity information of all nodes or part of nodes on the said loop communication information intermediate ring road said passive network is a loop network.
Above-mentioned method, wherein, said the 2nd OLT is transmitted to a said OLT through the webmaster node with said loop communication information after receiving the said loop communication information of subsequent use ONU transmission.
Above-mentioned method, wherein, said loop communication information is a PLOAM message;
Above-mentioned method, wherein, said loop communication information comprises, the ID of ONU, message structure type and identity information.
Above-mentioned method, wherein, said method also comprises,
If an OLT detects trunk optical fiber or branch optical fiber breaks down, then send instruction to the 2nd OLT, order the 2nd OLT to notify all or part of ONU to carry out main-apparatus protection and switch.
Above-mentioned method, wherein,
Said master is to be positioned at two inner logic ONU of same ONU with ONU and subsequent use ONU; Perhaps belong to two PON mouths of same ONU; Two PON mouths of said two logic ONU or same ONU have optical module and the medium access control chip of oneself respectively, and through common CPU management.
The present invention also provides a kind of EPON loop detection system, and said system comprises,
The one OLT is used for sending the loop communication information to main with ONU, and after receiving said loop communication information, judges that said EPON is a loop network;
The master uses ONU, is used for after receiving said loop communication information, said loop communication information being sent to subsequent use ONU;
Subsequent use ONU is used for after receiving said loop communication information, said loop communication information being sent to the 2nd OLT;
The 2nd OLT after being used to receive the said loop communication information of subsequent use ONU transmission, is transmitted to a said OLT with said loop communication information.
Above-mentioned system, wherein, a said OLT is used to judge that said EPON is that loop network is specially,
A said OLT is used to judge that said loop communication information is consistent with the loop communication information of its transmission, judges that then said passive network is a loop network.
Above-mentioned system wherein, after said master receives said loop communication information with ONU, subsequent use ONU, the 2nd OLT, adds its identity information to said loop communication information and sends.
Above-mentioned system, wherein, a said OLT is used to judge that said EPON is that loop network is specially,
The one OLT is used for the identity information according to all nodes or part of nodes on the said loop communication information intermediate ring road, judges that then said passive network is a loop network.
Above-mentioned system, wherein, an OLT also is used for when detecting trunk optical fiber or branch optical fiber and break down, then sending instruction to the 2nd OLT, orders the 2nd OLT to notify all or part of ONU to carry out main-apparatus protection and switches.
Adopt method and system of the present invention; Communicate by letter with the loop between the ONU through the OLT judgement, when trunk optical fiber or branch optical fiber disconnection, notify ONU to protect through spare OLT and switch; Shortened the time that the ONU protection is switched; Protect the professional timely transmission of time-sensitive in the PON system, made ONU and OLT restoring communication fast, improved the service quality of PON system.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes a part of the present invention, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, does not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the topology diagram of PON system;
Fig. 2 (a) is full guard mode EPON first topology diagram;
Fig. 2 (b) is full guard mode EPON second topology diagram;
Fig. 3 is the embodiment of the invention one flow chart;
Fig. 4 is the embodiment of the invention two flow charts;
Fig. 5 is an EPON loop detection system construction drawing.
Embodiment
In order to make technical problem to be solved by this invention, technical scheme and beneficial effect clearer, clear,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Embodiment one:
In Fig. 2 (a) and (b), OLT1 is connected with ONU through optical splitter 1 and all are main.OLT1 and main with carrying out the registration activation of ONU and the transmission of the business datum between OLT and the ONU based on GPON or based on the technological PON of future generation of GPON between the ONU.As shown in Figure 3, be the embodiment of the invention one flow chart, as shown in Figure 3, whether OLT1 adopts following step to judge by OLT1, the main loop of forming with ONU, subsequent use ONU and OLT2 and can communicate by letter:
Step S301; OLT1 sends loop communication Round_Trip_Correspondence message to main with ONU; This message adopts PLOAM (Physical Layer Operations; Administration andMaintenance, administers and maintains physical layer operations) mechanism, PLOAM is applicable to management maintenance information interaction and the processing timely fast between OLT and the ONU.The form of said loop communication information is as shown in table 1:
The structure of table 1 Round_Trip_Correspondence message
As shown in table 1, first byte of Round_Trip_Correspondence message is the value of ONU-ID, representes that this message is to send to the ONU of ONU-ID value for ONU-ID1, and perhaps this message is the ONU transmission of ONU-ID value for ONU-ID1; The type of this PLOAM message of the content representation of second byte is the structural information type of Round_Trip_Correspondence message; The content of the 3rd to the 12 byte is for keeping; Perhaps insert the identity information value (not covering the identity information that other nodes are inserted) of oneself successively, perhaps insert the identity information value (covering the identity information that other nodes are inserted) of oneself by the node of receiving this message by the node of receiving this message;
Step S302, master directly are transmitted to subsequent use ONU with said Round_Trip_Correspondence message after receiving the loop communication Round_Trip_Correspondence message of OLT1 transmission with ONU;
Step S303, subsequent use ONU directly are transmitted to OLT2 with said Round_Trip_Correspondence message after receiving main Round_Trip_Correspondence message with the ONU transmission;
Step S304, OLT2 directly are transmitted to OLT1 with said Round_Trip_Correspondence message after receiving the Round_Trip_Correspondence message of subsequent use ONU transmission;
Step S305; After OLT1 receives the Round_Trip_Correspondence message of OLT2 transmission; If said Round_Trip_Correspondence message is identical with the Round_Trip_Correspondence message of oneself sending, then OLT1 judges by OLT1, the main loop of forming with ONU, subsequent use ONU and OLT2 and can communicate by letter.
In the present embodiment; OLT1 judges by OLT1, the main loop of forming with ONU, subsequent use ONU and OLT2 and can communicate by letter; OLT1 can adopt identical method to judge that the master can communicate by letter with the loop of OLT to main with ONU, subsequent use ONU, spare OLT, webmaster node with OLT, master at last in other embodiment; Then when OLT1 detects optical fiber between self and the optical splitter 1 and breaks off; Can not communicate by letter if OLT1 judges by OLT1, the main loop of forming with ONU, subsequent use ONU, OLT2, webmaster node, then OLT1 orders OLT2 to notify whole ONU to protect through the webmaster node to switch; When OLT1 detects optical splitter 1 and main with the some or all of optical fiber disconnection between the ONU; If the OLT1 judgement can not be communicated by letter by OLT1, the main loop of forming with ONU, subsequent use ONU, OLT2 and webmaster node, then OLT1 protects through the ONU on the whole branch optical fibers that perhaps break down of webmaster node order OLT2 notice and switches.
In the present embodiment; The pass order of the Round_Trip_Correspondence message that OLT1 sends is that OLT1, master arrive OLT1 at last with ONU, subsequent use ONU, OLT2, and the pass order of the Round_Trip_Correspondence message that OLT1 sends in other embodiment also can arrive the main OLT that uses with OLT, spare OLT, subsequent use ONU, master with ONU for main at last; Said loop by main with OLT, main with ONU, subsequent use ONU, spare OLT, when the webmaster node is formed, the pass order of the Round_Trip_Correspondence message that OLT1 sends is that the master arrives the master with OLT, master at last with ONU, subsequent use ONU, spare OLT, webmaster node and uses OLT; The pass order of the Round_Trip_Correspondence message that OLT1 sends also can be used OLT to the master with OLT, webmaster node, spare OLT, subsequent use ONU, master with ONU for main at last.
Subsequent use ONU described in the present embodiment and master are to be positioned at two inner logic ONU of same ONU with ONU; Or belong to two PON mouths of same ONU; Two PON mouths of said two logic ONU or same ONU have optical module and the medium access control chip of oneself respectively, and through common CPU management.
Present embodiment is applicable to GPON system, EPON system and based on the PON of future generation system of GPON technology or EPON technology, like XG PON system and 10G EPON system.
Embodiment two:
In Fig. 2 (a) and (b), OLT1 is connected with ONU through optical splitter 1 and all are main.OLT1 and main with carrying out the registration activation of ONU and the transmission of the business datum between OLT and the ONU based on GPON or based on the technological PON of future generation of GPON between the ONU.As shown in Figure 4, whether OLT1 adopts following step to judge by OLT1, the main loop of forming with ONU, subsequent use ONU and OLT2 and can communicate by letter:
Step S401, OLT1 sends loop communication Round_Trip_Correspondence message to main with ONU, adopts PLOAM mechanism, and the form of said loop communication information is as shown in table 1:
The structure of table 2 Round_Trip_Correspondence message
As shown in table 2, first byte of Round_Trip_Correspondence message is the value of ONU-ID, representes that this message of this expression is to send to the ONU of ONU-ID value for ONU-ID1, and perhaps this message is the ONU transmission of ONU-ID value for ONU-ID1; The type of this PLOAM message of the content representation of second byte is the structural information type of Round_Trip_Correspondence message; The content of the 3rd to the 12 byte is for keeping; Perhaps insert the identity information value (not covering the identity information that other nodes are inserted) of oneself successively, perhaps insert the identity information value (covering the identity information that other nodes are inserted) of oneself by the node of receiving this message by the node of receiving this message.
Step S402; After the master receives the Round_Trip_Correspondence message of OLT1 transmission with ONU; Its ONU-ID value (perhaps with oneself LLID LLID value) is written to the Data territory of first non-zero of Round_Trip_Correspondence message, then said Round_Trip_Correspondence message directly is transmitted to subsequent use ONU;
Step S403; After subsequent use ONU receives main Round_Trip_Correspondence message with the ONU transmission; Its ONU-ID value (perhaps with oneself LLID LLID value) is written to the Data territory of first non-zero of Round_Trip_Correspondence message, then said Round_Trip_Correspondence message directly is transmitted to OLT2;
Step S404; After OLT2 receives the Round_Trip_Correspondence message of subsequent use ONU transmission; Oneself identity information value (for example PON ident value) is written to the Data territory of first non-zero of Round_Trip_Correspondence message, then said Round_Trip_Correspondence message directly is transmitted to OLT1;
Step S405; After OLT1 receives the Round_Trip_Correspondence message of OLT2 transmission, judge by OLT1, the main loop of forming with ONU, subsequent use ONU and OLT2 and can communicate by letter according to the identity information value that all nodes or department's node in the said Round_Trip_Correspondence message are inserted.
In the present embodiment; After adopting each node to receive the Round_Trip_Correspondence message of node transmission; Oneself identity information value is written to the Data territory of first non-zero of Round_Trip_Correspondence message; Send to next node then; In other embodiment, also can adopt the Round_Trip_Correspondence message that each node receives that a node sends after, oneself identity information value is written to the Data territory of Round_Trip_Correspondence message; Promptly cover the identity information value that last node writes; Send to next node then, after then OLT1 receives the Round_Trip_Correspondence message of OLT2 transmission, judge by OLT1, the main loop of forming with ONU, subsequent use ONU and OLT2 and can communicate by letter according to the identity information value that OLT2 in the said Round_Trip_Correspondence message inserts.
In the present embodiment; OLT1 judges by OLT1, the main loop of forming with ONU, subsequent use ONU and OLT2 and can communicate by letter; OLT1 can adopt identical method to judge that the master can communicate by letter with the loop of OLT to main with ONU, subsequent use ONU, spare OLT, webmaster node with OLT, master at last in other embodiment; Then when OLT1 detects optical fiber between self and the optical splitter 1 and breaks off; Can not communicate by letter if OLT1 judges by OLT1, the main loop of forming with ONU, subsequent use ONU, OLT2, webmaster node, then OLT1 orders OLT2 to notify whole ONU to protect through the webmaster node to switch; When OLT1 detects optical splitter 1 and main with the some or all of optical fiber disconnection between the ONU; If the OLT1 judgement can not be communicated by letter by OLT1, the main loop of forming with ONU, subsequent use ONU, OLT2 and webmaster node, then OLT1 protects through the ONU on the whole branch optical fibers that perhaps break down of webmaster node order OLT2 notice and switches.
In the present embodiment; The pass order of the Round_Trip_Correspondence message that OLT1 sends is that OLT1, master arrive OLT1 at last with ONU, subsequent use ONU, OLT2, and the pass order of the Round_Trip_Correspondence message that OLT1 sends in other embodiment also can arrive the main OLT that uses with OLT, spare OLT, subsequent use ONU, master with ONU for main at last; Said loop by main with OLT, main with ONU, subsequent use ONU, spare OLT, when the webmaster node is formed, the pass order of the Round_Trip_Correspondence message that OLT1 sends is that the master arrives the master with OLT, master at last with ONU, subsequent use ONU, spare OLT, webmaster node and uses OLT; The pass order of the Round_Trip_Correspondence message that OLT1 sends also can be used OLT to the master with OLT, webmaster node, spare OLT, subsequent use ONU, master with ONU for main at last.
Subsequent use ONU described in the present embodiment and master are to be positioned at two inner logic ONU of same ONU with ONU; Or belong to two PON mouths of same ONU; Two PON mouths of said two logic ONU or same ONU have optical module and the medium access control chip of oneself respectively, and through common CPU management.
Present embodiment is applicable to GPON system, EPON system and based on the PON of future generation system of GPON technology or EPON technology, like XG PON system and 10G EPON system.
Embodiment three
As shown in Figure 5, be EPON loop detection system construction drawing, said system comprises,
The one OLT is used for sending the loop communication information to main with ONU, and after receiving said loop communication information, judges that said EPON is a loop network;
The master uses ONU, is used for after receiving said loop communication information, said loop communication information being sent to subsequent use ONU;
Subsequent use ONU is used for after receiving said loop communication information, said loop communication information being sent to the 2nd OLT;
The 2nd OLT after being used to receive the said loop communication information of subsequent use ONU transmission, is transmitted to a said OLT with said loop communication information.
A said OLT is used to judge that said EPON is that loop network is specially,
A said OLT is used to judge that said loop communication information is consistent with the loop communication information of its transmission, judges that then said passive network is a loop network.
After said master receives said loop communication information with ONU, subsequent use ONU, the 2nd OLT, add its identity information to said loop communication information and send.
A said OLT is used to judge that said EPON is that loop network is specially,
The one OLT is used for the identity information according to all nodes or part of nodes on the said loop communication information intermediate ring road, judges that then said passive network is a loop network.
In the said system, an OLT also is used for when detecting trunk optical fiber or branch optical fiber and break down, then sending instruction to the 2nd OLT, orders the 2nd OLT to notify all or part of ONU to carry out main-apparatus protection and switches.
Above-mentioned explanation illustrates and has described the preferred embodiments of the present invention; But as previously mentioned; Be to be understood that the present invention is not limited to the form that this paper discloses, should do not regard eliminating as, and can be used for various other combinations, modification and environment other embodiment; And can in invention contemplated scope described herein, change through the technology or the knowledge of above-mentioned instruction or association area.And change that those skilled in the art carried out and variation do not break away from the spirit and scope of the present invention, then all should be in the protection range of accompanying claims of the present invention.
Claims (14)
1. EPON loop detecting method, said EPON adopts the full guard pattern, it is characterized in that, and said method comprises,
First optical line terminal sends the loop communication information to main with optical network unit, and the master sends to subsequent use optical network unit with said loop communication information after receiving said loop communication information with optical network unit;
Second optical line terminal is transmitted to said first optical line terminal with said loop communication information after receiving the said loop communication information of subsequent use optical network unit transmission;
After first optical line terminal is received said loop communication information, judge that then said EPON is a loop network.
2. method according to claim 1 is characterized in that, said first optical line terminal judges that said EPON is that loop network is specially,
First optical line terminal judges that said loop communication information is consistent with the loop communication information of its transmission, judges that then said passive network is a loop network.
3. method according to claim 1 is characterized in that, after said master receives said loop communication information with optical network unit, subsequent use optical network unit, second optical line terminal, adds its identity information to said loop communication information and sends.
4. method according to claim 3 is characterized in that, said first optical line terminal judges that said EPON is that loop network is specially,
First optical line terminal judges then that according to the identity information of all nodes or part of nodes on the said loop communication information intermediate ring road said passive network is a loop network.
5. according to the arbitrary described method of claim 1 to 4; It is characterized in that; Said second optical line terminal is transmitted to said first optical line terminal through the webmaster node with said loop communication information after receiving the said loop communication information of subsequent use optical network unit transmission.
6. according to the arbitrary described method of claim 1 to 4, it is characterized in that said loop communication information is physical layer operations, administer and maintain PLOAM message.
7. method according to claim 6 is characterized in that, said loop communication information comprises,
The ID of optical network unit, message structure type and identity information.
8. according to the arbitrary described method of claim 1 to 4, it is characterized in that said method also comprises,
If first optical line terminal detects trunk optical fiber or branch optical fiber breaks down, then send instruction to second optical line terminal, order second optical line terminal to notify all or part of optical network unit to carry out main-apparatus protection and switch.
9. according to the arbitrary described method of claim 1 to 4, it is characterized in that,
Said master is to be positioned at two inner logic optical network units of same optical network unit with optical network unit and subsequent use optical network unit; Perhaps belong to two EPON mouths of same optical network unit; Two EPON mouths of said two logic optical network units or same optical network unit have optical module and the medium access control chip of oneself respectively, and through common CPU management.
10. an EPON loop detection system is characterized in that, said system comprises,
First optical line terminal is used for sending the loop communication information to main with optical network unit, and after receiving said loop communication information, judges that said EPON is a loop network;
The master uses optical network unit, is used for after receiving said loop communication information, said loop communication information being sent to subsequent use optical network unit;
Subsequent use optical network unit is used for after receiving said loop communication information, said loop communication information being sent to second optical line terminal;
Second optical line terminal after being used to receive the said loop communication information of subsequent use optical network unit transmission, is transmitted to said first optical line terminal with said loop communication information.
11. system according to claim 10 is characterized in that, said first optical line terminal is used to judge that said EPON is that loop network is specially,
Said first optical line terminal is used to judge that said loop communication information is consistent with the loop communication information of its transmission, judges that then said passive network is a loop network.
12. system according to claim 10 is characterized in that, after said master receives said loop communication information with optical network unit, subsequent use optical network unit, second optical line terminal, adds its identity information to said loop communication information and sends.
13. system according to claim 12 is characterized in that, said first optical line terminal is used to judge that said EPON is that loop network is specially,
First optical line terminal is used for the identity information according to all nodes or part of nodes on the said loop communication information intermediate ring road, judges that then said passive network is a loop network.
14. according to the arbitrary described system of claim 10 to 13, it is characterized in that, in the said system,
First optical line terminal also is used for when detecting trunk optical fiber or branch optical fiber and break down, then sending instruction to second optical line terminal, orders second optical line terminal to notify all or part of optical network unit to carry out main-apparatus protection and switches.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110087946.2A CN102740171B (en) | 2011-04-08 | 2011-04-08 | A kind of EPON loop detecting method and system |
| PCT/CN2012/072049 WO2012136089A1 (en) | 2011-04-08 | 2012-03-07 | Loop detection method and system for passive optical network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110087946.2A CN102740171B (en) | 2011-04-08 | 2011-04-08 | A kind of EPON loop detecting method and system |
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Cited By (4)
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| CN105591692A (en) * | 2015-11-04 | 2016-05-18 | 杭州华三通信技术有限公司 | Method and device of loop elimination in Ethernet passive optical network (EPON) |
| CN106878057A (en) * | 2016-12-31 | 2017-06-20 | 广东东研网络科技股份有限公司 | Loop detection and sweep-out method in Ethernet passive optical network EPON system |
| CN107979412A (en) * | 2017-12-21 | 2018-05-01 | 凌云天博光电科技股份有限公司 | Optical network unit loop detecting method and device |
| CN110440391A (en) * | 2019-08-07 | 2019-11-12 | 珠海格力电器股份有限公司 | Loop network guard method, air-conditioning system |
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| CN1889405A (en) * | 2005-06-29 | 2007-01-03 | 华为技术有限公司 | Optical splitter and passive optical network loop system |
| CN1921357A (en) * | 2006-09-21 | 2007-02-28 | 杭州华为三康技术有限公司 | Full optical fibre protecting device and method |
| US20090041455A1 (en) * | 2006-11-02 | 2009-02-12 | Jun Shi | Passive optical network systems with loop detection capability and methods for the loop detection |
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| CN105591692A (en) * | 2015-11-04 | 2016-05-18 | 杭州华三通信技术有限公司 | Method and device of loop elimination in Ethernet passive optical network (EPON) |
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| CN107979412A (en) * | 2017-12-21 | 2018-05-01 | 凌云天博光电科技股份有限公司 | Optical network unit loop detecting method and device |
| CN107979412B (en) * | 2017-12-21 | 2020-03-13 | 凌云天博光电科技股份有限公司 | Optical network unit loop detection method and device |
| CN110440391A (en) * | 2019-08-07 | 2019-11-12 | 珠海格力电器股份有限公司 | Loop network guard method, air-conditioning system |
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| CN102740171B (en) | 2015-08-12 |
| WO2012136089A1 (en) | 2012-10-11 |
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