CN104796287A - Method for detecting faults of looped EPON (Ethernet passive optical networks) - Google Patents
Method for detecting faults of looped EPON (Ethernet passive optical networks) Download PDFInfo
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- CN104796287A CN104796287A CN201510161756.9A CN201510161756A CN104796287A CN 104796287 A CN104796287 A CN 104796287A CN 201510161756 A CN201510161756 A CN 201510161756A CN 104796287 A CN104796287 A CN 104796287A
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Abstract
The invention relates to the field of detection for faults of power networks, in particular to a method for detecting faults of looped EPON (Ethernet passive optical networks). The method for detecting the faults of the looped EPON has the advantages that the faults in the integral looped EPON can be quickly detected in real time by the aid of the method, and accordingly the reliability of first ports and second ports of optical line terminal equipment in the looped EPON can be guaranteed; the looped EPON are configured with IEEE (institute of electrical and electronic engineers) 1588 protocols, accordingly, the convergence time of loops can be shortened, and data transmission demand with high requirements on instantaneity can be met; links and equipment can be duplicated by the optical line terminal equipment by the aid of loop network protection technologies, and accordingly the safety can be greatly enhanced.
Description
Technical field
The present invention relates to electric network fault detection field, particularly relate to a kind of EPON ring network fault detection method.
Background technology
In loop-type network system, generally adopt the mode in disable standby path, thus avoid due to data undying winding in looped network, form broadcast storm.There is path in backup path, but this physical path does not carry out transfer of data, logically forms open circuit physically.When the physical connection of equipment or equipment room breaks down, by open circuit in logic in previous system is replied as path, realize fault-finding fast and recovery, ensure the data proper communication of all devices part on looped network.
In looped network, produce broadcast storm, optical line terminal equipment looped network generally adopts STP agreement or RRPP agreement loop prevention mechanism.But in actual applications, the convergence time of STP agreement is subject to the impact of network topology, and when network diameter is larger, convergence time is longer, thus often can not meet the requirement of the higher data of transmission quality.RRPP agreement must select a host node on each RRPP ring, host node cycle send health monitoring message from its master port, propagate on ring through a transmission node successively.The method is too large to host node dependence, if host node breaks down, then whole looped network cannot normally run, and health monitoring message dependence host node sends, and propagates successively, if nodes is many, the transmission time can be caused long through a transmission node on ring.
Summary of the invention
In view of the above problems, the invention provides a kind of EPON ring network fault detection method, it is characterized in that, comprise the following steps:
Step S1: provide the looped network that is provided with at least two optical line terminal equipments, each described optical line terminal equipment all has the first port and the second port;
Step S2: the call duration time of described looped network is divided into some isometric time periods;
Step S3: in the initial time of each described time period, each described optical line terminal equipment all sends link detection message by the first port of this optical line terminal equipment and the second port to adjacent optical line terminal equipment and receives the link detection messages that adjacent optical line terminal equipment sends.
Above-mentioned method, is characterized in that, if described optical line terminal equipment receives the link detection message that adjacent optical line terminal equipment sends in setting-up time, then the Link State between this optical line terminal equipment and adjacent optical line terminal equipment is good;
If described optical line terminal equipment does not receive the link detection message that adjacent optical line terminal equipment sends in described setting-up time, then the link failure between this optical line terminal equipment and adjacent optical line terminal equipment.
Above-mentioned method, is characterized in that, if described optical line terminal equipment receives the link detection message that adjacent optical line terminal equipment sends in setting-up time, then this optical line terminal equipment and adjacent optical line terminal equipment in good condition;
If described optical line terminal equipment does not receive the link detection message that adjacent optical line terminal equipment sends in described setting-up time, then this optical line terminal equipment or adjacent optical line terminal equipment break down.
Above-mentioned method, is characterized in that, described link detection message comprises the health status of the operating state of described optical line terminal equipment, described first port, described second port and connection line.
Above-mentioned method, is characterized in that, after the call duration time of described looped network is divided into some isometric time periods, described step S2 also comprises:
Step S21: setting an optical line terminal equipment is main equipment in described looped network;
Step S22: each described optical line terminal equipment safeguards a described time period respectively;
Step S23: the described time period is synchronized to described main equipment according to agreement, realizes described looped network clock unified.
Above-mentioned method, is characterized in that, described agreement is IEEE1588 agreement.
Above-mentioned method, is characterized in that, if break down; detect that the optical line terminal equipment of fault sends link warning message to its adjacent optical line terminal equipment; after its adjacent optical line terminal equipment receives described warning message, described looped network adopts full self-healed protection, to fix a breakdown.
Above-mentioned method, is characterized in that, described full self-healed protection is:
Described first port or described second port that are in blocked state are automatically set as forwarding state, complete pretection switch.
Above-mentioned method, is characterized in that, each described optical line terminal equipment is configured with at least one optical network unit.
Above-mentioned method, is characterized in that, described optical network unit is configured with an input port and two output ports.
In sum; the EPON ring network fault detection method of the present invention's design can detect fault in whole looped network real-time; guarantee the first port of optical line terminal equipment in looped network and the reliability of the second port; and configure IEEE1588 agreement; the loop convergence time is reduced; thus meet the high data transfer demands of requirement of real-time, and optical line terminal equipment realizes link and device backup by looped network protection technology, and fail safe is greatly improved.
Accompanying drawing explanation
With reference to appended accompanying drawing, to describe embodiments of the invention more fully.But, appended accompanying drawing only for illustration of and elaboration, do not form limitation of the scope of the invention.
Fig. 1 is optical line terminal equipment ring network framework schematic diagram of the present invention;
Fig. 2 is optical network unit of the present invention and optical line terminal equipment annexation figure.
Embodiment
In order to make technical scheme of the present invention and advantage easy to understand more, be described in further detail below in conjunction with accompanying drawing.Should illustrate, specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
Along with the development of social progress and power automation, requirement for the bandwidth sum amount of information of distribution system communication improves constantly, passive optical network technique based on Ethernet is applied in distribution system communication, based on the theory and realization of EPON technology, how applying EPON technology for distribution system, to carry out networking be very crucial, wherein wants emphasis to consider the topological structure of networking and the effect of equipment.
As shown in Figure 1 and Figure 2, so the protection mechanism of optical line terminal equipment looped network improved, in optical line terminal equipment looped network, do not choose host node, all optical line terminal equipments are in reciprocity status.In looped network, call duration time is divided into some isometric time periods, all optical line terminal equipments of makeup ring l network safeguard a time period respectively, and according to IEEE1588 agreement, this time period is synchronized to main equipment (in looped network, arbitrary optical line terminal equipment all can be appointed as main equipment) unique in whole loop network, realize the unification of whole network time.On this basis, in order to realize fault-finding fast and recovery, adopting link detection technology initiatively, detecting for equipment fault and communication link fails respectively, and realize failover fast according to the result of fault-finding.
The active link Detection Techniques of equipment fault or communication link fails in equipment active probe loop network:
In the initial time of each time period, in network, all devices is by two loop ports, send link detection message on one's own initiative to two, left and right equipment adjacent with it, equipment is while transmission detection messages, and wait-receiving mode is from the detection messages of left and right neighbouring device simultaneously.After each equipment receives the detection messages of the equipment of being adjacent, stop forwarding this message, and by information feed back such as the working condition of self, port and link health status to neighbouring device.
Each equipment respectively should receive the link detection message of a neighbouring device transmission at the appointed time from two port, after the equipment of initiating link detecting request receives this response, think that its two adjacent equipment and link are therebetween in a good state of health, be not for further processing.If at the appointed time, equipment does not receive the detection messages sent from neighbouring device, then mean that fault has appearred in the equipment that is adjacent or link.Detect that the equipment of fault all can send link warning message, fault is informed other equipment.After other equipment receive warning message, the port being originally in blocked state is set to forwarding state, realizes fault recovery.
Be described below in conjunction with example
The present invention designs a kind of EPON ring network fault detection method, comprising following steps:
Step S1: provide the looped network that is provided with some optical line terminal equipments, each optical line terminal equipment all has the first port and the second port, and the first port of each optical line terminal equipment, the second port successively annular connect;
Step S2: looped network call duration time is divided into some isometric time periods;
Step S3: in the initial time of each time period, each optical line terminal equipment sends link detection message by the first port and the second port to adjacent optical line terminal equipment and receives the link detection messages that adjacent ray terminal equipment sends;
Wherein, if optical line terminal equipment receives the link detection message that adjacent optical line terminal equipment sends, then the Link State between this optical line terminal equipment and adjacent optical line terminal equipment is good;
If optical line terminal equipment does not receive the link detection message that in adjacent two optical line terminal equipments, arbitrary equipment sends at the appointed time, then the link failure between this optical line terminal equipment and adjacent optical line terminal equipment;
If optical line terminal equipment receives the link detection message that adjacent optical line terminal equipment sends, then this optical line terminal equipment and adjacent optical line terminal equipment in good condition;
If optical line terminal equipment does not receive the link detection message that in adjacent two optical line terminal equipments, arbitrary equipment sends at the appointed time, then break down between this optical line terminal equipment or adjacent optical line terminal equipment.
In aforesaid operations step, link detection message comprises the information such as health status of the operating state of optical line terminal equipment, the first port of optical line terminal equipment and the second port, equipment and equipment room connection line.
In the present invention, after the call duration time of described looped network is divided into some isometric time periods, further comprises in step S2:
Step S21: setting an optical line terminal equipment in EPON looped network is main equipment in looped network;
Step S22: in this looped network, each optical line terminal equipment safeguards a time period respectively;
Step S23: the time period to be synchronized to according to agreement on the main equipment in looped network, realizes looped network clock unified like this.
This agreement is IEEE1588 agreement, this agreement is again the accurate clock synchronous protocol of networking measurement and control system, uses hardware and software to coordinate, does not need extra clock line, still use the data wire transmission clock signal of original Ethernet, networking is connected and simplifies.
In the present invention; if the fault of detecting, detect that the optical line terminal equipment of fault sends link warning message, after its adjacent optical line terminal equipment receives warning message to its adjacent optical line terminal equipment; looped network adopts full self-healed protection, to fix a breakdown.
Optical line terminal equipment first port and the second port connect into looped network; send data first port and the second port two-way redundancy; when loop breaks down; such formation is from the syndeton of recovery from illness; guarantee the first port and the second port reliability of output; add and use IEEE1588 agreement, blocked state first port will be in or the second port is automatically set as forwarding state, complete pretection switch.
As shown in Figure 2, in the present invention each optical line terminal equipment is configured with at least one optical network unit, these optical network units are all configured with an input port and two output ports, in the present invention, these optical network units select the broadcast data receiving optical line terminal equipment transmission, the range finding that response light line terminal equipment sends and power control command also do corresponding adjustment, optical network unit carries out buffer memory to the Ethernet data of user, and sends to up direction in the send window of optical line terminal equipment distribution.
One is had to the adapted electric automation system of distribution main website, distribution substation and distribution terminal structure, because distribution terminal number of devices is large, kind is many, distribution is wide, thus select suitable communication mode to seem most important.EPON technology advantage in these areas provides desirable solution, disposes two Real Time Communication Network to improve the reliability of main station system information interaction, in distribution substation, dispose optical line terminal equipment at main station system.End side according to distribution radial, hand in hand looped network, netted connected mode provide tree-shaped, the optical-fiber network topological structure such as active and standby optical fiber, chain hand in hand, the optical network unit that monitor optical line terminal equipment deploy adapted electricity is special simultaneously, improves the reliability of network.
In sum; the EPON ring network fault detection method of the present invention's design can detect fault in whole looped network real-time; guarantee the first port of optical line terminal equipment in looped network and the reliability of the second port; and configure IEEE1588 agreement; the loop convergence time is reduced; meet the data transfer demands that requirement of real-time is high, and optical line terminal equipment realizes link and device backup by looped network protection technology, fail safe is greatly improved.
By illustrating and accompanying drawing, giving the exemplary embodiments of the ad hoc structure of embodiment, based on the present invention's spirit, also can do other conversion.Although foregoing invention proposes existing preferred embodiment, but these contents are not as limitation.
For a person skilled in the art, after reading above-mentioned explanation, various changes and modifications undoubtedly will be apparent.Therefore, appending claims should regard the whole change and correction of containing true intention of the present invention and scope as.In Claims scope, the scope of any and all equivalences and content, all should think and still belong to the intent and scope of the invention.
Claims (10)
1. an EPON ring network fault detection method, is characterized in that, comprises the following steps:
Step S1: provide the looped network that is provided with at least two optical line terminal equipments, each described optical line terminal equipment all has the first port and the second port;
Step S2: the call duration time of described looped network is divided into some isometric time periods;
Step S3: in the initial time of each described time period, each described optical line terminal equipment all sends link detection message by the first port of this optical line terminal equipment and the second port to adjacent optical line terminal equipment and receives the link detection messages that adjacent optical line terminal equipment sends.
2. method according to claim 1, it is characterized in that, if described optical line terminal equipment receives the link detection message that adjacent optical line terminal equipment sends in setting-up time, then the Link State between this optical line terminal equipment and adjacent optical line terminal equipment is good;
If described optical line terminal equipment does not receive the link detection message that adjacent optical line terminal equipment sends in described setting-up time, then the link failure between this optical line terminal equipment and adjacent optical line terminal equipment.
3. method according to claim 1, it is characterized in that, if described optical line terminal equipment receives the link detection message that adjacent optical line terminal equipment sends in setting-up time, then this optical line terminal equipment and adjacent optical line terminal equipment in good condition;
If described optical line terminal equipment does not receive the link detection message that adjacent optical line terminal equipment sends in described setting-up time, then this optical line terminal equipment or adjacent optical line terminal equipment break down.
4. method according to claim 1, is characterized in that, described link detection message comprises the health status of the operating state of described optical line terminal equipment, described first port, described second port and connection line.
5. method according to claim 1, is characterized in that, after the call duration time of described looped network is divided into some isometric time periods, described step S2 also comprises:
Step S21: setting an optical line terminal equipment is main equipment in described looped network;
Step S22: each described optical line terminal equipment safeguards a described time period respectively;
Step S23: the described time period is synchronized to described main equipment according to agreement, realizes described looped network clock unified.
6. method according to claim 5, is characterized in that, described agreement is IEEE1588 agreement.
7. the method according to any one of Claims 2 or 3; it is characterized in that; if break down; detect that the optical line terminal equipment of fault sends link warning message to its adjacent optical line terminal equipment; after its adjacent optical line terminal equipment receives described warning message; described looped network adopts full self-healed protection, to fix a breakdown.
8. method according to claim 7, is characterized in that, described full self-healed protection is:
Described first port or described second port that are in blocked state are automatically set as forwarding state, complete pretection switch.
9. method according to claim 1, is characterized in that, each described optical line terminal equipment is configured with at least one optical network unit.
10. method according to claim 9, is characterized in that, described optical network unit is configured with an input port and two output ports.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510161756.9A CN104796287A (en) | 2015-04-07 | 2015-04-07 | Method for detecting faults of looped EPON (Ethernet passive optical networks) |
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| CN201510161756.9A CN104796287A (en) | 2015-04-07 | 2015-04-07 | Method for detecting faults of looped EPON (Ethernet passive optical networks) |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105553546A (en) * | 2015-12-04 | 2016-05-04 | 航天恒星科技有限公司 | System and method for monitoring optical network faults in real time |
| CN106789192A (en) * | 2016-12-06 | 2017-05-31 | 无锡路通视信网络股份有限公司 | Applied in the detection of system loop failure and processing method, system and EPON terminals |
| CN106850271A (en) * | 2016-12-30 | 2017-06-13 | 国网天津市电力公司 | A kind of distribution main website and terminal communication network failure analysis method |
| CN113543184A (en) * | 2021-07-08 | 2021-10-22 | 中津沛科建设股份有限公司 | Wireless monitoring method and system for tunnel electromechanical equipment and readable storage medium |
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| CN105553546A (en) * | 2015-12-04 | 2016-05-04 | 航天恒星科技有限公司 | System and method for monitoring optical network faults in real time |
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| CN106850271A (en) * | 2016-12-30 | 2017-06-13 | 国网天津市电力公司 | A kind of distribution main website and terminal communication network failure analysis method |
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| CN113543184A (en) * | 2021-07-08 | 2021-10-22 | 中津沛科建设股份有限公司 | Wireless monitoring method and system for tunnel electromechanical equipment and readable storage medium |
| CN113543184B (en) * | 2021-07-08 | 2022-10-14 | 中津沛科建设股份有限公司 | Wireless monitoring method and system for tunnel electromechanical equipment and readable storage medium |
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Inventor after: Ling Ping Inventor after: Liu Jinsong Inventor after: Liu Yang Inventor after: Zhang Jianping Inventor after: Li Yong Inventor after: Yang Ruijun Inventor before: Liu Jinsong Inventor before: Liu Yang Inventor before: Zhang Jianping Inventor before: Li Yong Inventor before: Yang Ruijun |
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Application publication date: 20150722 |