CN101877612A - System for protecting optical link of passive optical network, device thereof and method thereof - Google Patents
System for protecting optical link of passive optical network, device thereof and method thereof Download PDFInfo
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- CN101877612A CN101877612A CN2010102227628A CN201010222762A CN101877612A CN 101877612 A CN101877612 A CN 101877612A CN 2010102227628 A CN2010102227628 A CN 2010102227628A CN 201010222762 A CN201010222762 A CN 201010222762A CN 101877612 A CN101877612 A CN 101877612A
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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
- H04B10/032—Arrangements for fault recovery using working and protection systems
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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
- 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 discloses a system for protecting an optical link of a passive optical network, a device thereof and a method thereof. The system comprises an optical line terminal, two optical splitters and a plurality of optical network units, wherein the optical line terminal is respectively connected with the two optical splitters through two lower connecting ports; the optical splitters the optical link which is from one lower connection port of the optical line terminal into a plurality of optical links; the plurality of optical network units respectively and correspondingly connect two upper connecting ports with one optical link on the two optical splitters; the mutually-protected optical links are formed between the optical line terminal and the two optical splitters; and the mutually-protected optical links are formed between each optical splitter and every two optical network units. By fast detecting the optical link, the invention effectively filters the dither of an optical signal on the optical link caused by the noise, the fault and the manual unplugging and plugging, thereby being capable of preventing from frequently switching between the two mutually-protected optical links.
Description
Technical field
The present invention relates to the optical fiber access technology, relate in particular to the method, system and device of EPON (PON, Passive OpticalNetwod) fiber optic protection.
Background technology
Ethernet passive optical network is a kind of novel Optical Access Network technology, and it adopts point to multipoint configuration and passive fiber transmission, and multiple business is provided on Ethernet.It adopts the PON technology in physical layer, uses Ethernet protocol at link layer, utilizes the topological structure of PON to realize the access of Ethernet.Therefore, it combines the advantage of PON technology and ethernet technology: low cost, and high bandwidth, autgmentability is strong, and the service reorganization is quick flexibly, with existing Ethernet compatibility, convenient management or the like.
In the last few years, the userbase of Access Network constantly enlarged, and was also growing to the requirement of network broadband, and PON has satisfied the objective requirement of network development and fusion as the broadband access technology of a new generation, and is increasingly extensive in Application in Access Network.But in access network construction, the PON system is nearer far from user distance, because of various application and environment for use complexity, is easy to be subjected to the influence of ignorance factors such as urban construction, causes optical fiber link interruption accident.Therefore, an urgent demand PON system can provide optical fiber link protection scheme efficiently, when optical fiber link generation significant trouble, can switch by the professional reliably protecting of realization in the short as far as possible time.
China Telecom has proposed the model (type A, type B, Type C, type D) of several fiber optic protections in EPON V2.1 standard (agreement), the above two belong to trunk optical fibre protection, and both then belong to all-fiber protection the back.This agreement has only been done simply physical model and has been described; provide the extended operation management maintenance (OAM that simply switches; Operation Administration Maintenance) frame format definition; and do not provide concrete implementation method; and only provided on the agreement and simply switched order, the robustness and the practicality of whole protecting system have not all been done discussion further.
Summary of the invention
Technical problem to be solved by this invention provides the method, system and device of realizing the protection of EPON optical link, can carry out reliably protecting to the optical link of XPON.
In order to solve the problems of the technologies described above, the invention provides a kind of system that realizes the protection of EPON optical link, comprising: an optical line terminal, two optical splitters and a plurality of optical network unit, wherein:
Optical line terminal is used for being connected with two optical splitters respectively by two second line of a couplet mouths;
Optical splitter is used for the optical link from a second line of a couplet mouth of optical line terminal is divided into many optical links;
Optical network unit is used for two upper united mouths are correspondingly linked to each other with each optical link on two optical splitters respectively;
Form the optical link of protection each other between optical line terminal and two optical splitters, form the optical link of protection each other between each optical splitter and per two optical network units.
Further, optical network unit also comprises two optical modules, one and switches switch and a PON MAC module except comprising two upper united mouths, wherein:
Each upper united mouth in two upper united mouths of optical network unit is connected with an optical module, and selects an optical module in two optical modules to be connected with PON MAC module by switching switch;
The inner optical link of protection each other that forms by two optical modules of optical network unit.
Further, switching switch is included in the changeover apparatus in the optical network unit, wherein:
Changeover apparatus is used for switching a optical module to two optical modules according to respectively the state-detection result of two optical modules being controlled the inner switch of switching.
Further, changeover apparatus is switched the switch except comprising, and also comprise interconnective optical link detection module and switch processing module, wherein:
The optical link detection module is used for the luminous power of two optical modules received respectively and detects in real time, changes and just produces alarm signal and report and switch processing module when detecting one of them optical module;
Switch processing module and switch switch and be connected, be used for the alarm signal that reports according to the optical link detection module, switch control command to switching switch output;
Switch switch under the control of switching control command of switching processing module output, switch an optical module in two optical modules is connected with PON MAC module.
Further,
Switching processing module is set the realization of employing hardware mode or adopts software mode to realize by the interface is set.
Further, changeover apparatus is at the optical link detection module and switch and also comprise anti-shake processing module between the processing module, wherein:
The optical link detection module detect one of them optical module change produce the hardware or the anti-shake processing of software of alarm signal by anti-shake processing module after, report and switch processing module;
Anti-shake processing module is used for the shake composition of filtering alarm signal.
Further, changeover apparatus also comprises and switches the protocol process module that switch is connected, wherein:
Protocol process module is used for according to the passive optical network agreement order of switching of switching order or optical network unit that optical line terminal issues being handled, and switches control command to switching switch output;
The described switch of switching is switched an optical module in two optical modules is connected with described PON MAC module under the control of switching control command of protocol process module output.
In order to solve the problems of the technologies described above, the invention provides a kind of optical network unit of realizing EPON optical link protection, contain two upper united mouths connecting two optical modules respectively, one at least and switch switch and a PON MAC module, wherein:
Two upper united mouths of optical network unit correspondingly link to each other with each optical link on two optical splitters respectively, are connected with PON MAC module by an optical module of switching in two optical modules of switch selection;
The inner optical link of protection each other that forms by two optical modules of optical network unit.
Further, switching switch is included in the changeover apparatus in the optical network unit, wherein:
Changeover apparatus is used for switching a optical module to two optical modules according to respectively the state-detection result of two optical modules being controlled the inner switch of switching.
Further, changeover apparatus is switched the switch except comprising, and also comprise interconnective optical link detection module and switch processing module, wherein:
The optical link detection module is used for the luminous power of two optical modules received and detects in real time respectively, changes and just produces alarm signal and report and switch processing module when detecting one of them optical module;
Switch processing module and switch switch and be connected, be used for the alarm signal that reports according to the optical link detection module, switch control command to switching switch output;
Switch switch under the control of switching control command of switching processing module output, switch an optical module in two optical modules is connected with PON MAC module.
Further,
Switching processing module is set the realization of employing hardware mode or adopts software mode to realize by the interface is set.
Further, changeover apparatus is at the optical link detection module and switch and also comprise anti-shake processing module between the processing module, wherein:
The optical link detection module detect one of them optical module change produce the hardware or the anti-shake processing of software of alarm signal by anti-shake processing module after, report and switch processing module;
Anti-shake processing module is used for the shake composition of filtering alarm signal.
Further, changeover apparatus also comprises and switches the protocol process module that switch is connected, wherein:
Protocol process module is used for according to the passive optical network agreement order of switching of switching order or optical network unit that optical line terminal issues being handled, and switches control command to switching switch output;
Switch switch under the control of switching control command of protocol process module output, switch an optical module in two optical modules is connected with PON MAC module.
In order to solve the problems of the technologies described above, the invention provides a kind of method that realizes the protection of EPON optical link, comprising:
An optical line terminal is connected with two optical splitters respectively by two second line of a couplet mouths, each optical splitter will be divided into many optical links from the optical link of a second line of a couplet mouth of optical line terminal, form the optical link of protection each other between optical line terminal and two optical splitters;
Optical link of on two optical splitters each correspondingly links to each other the optical link that formation is protected each other between each optical splitter and per two optical network units with two upper united mouths on the optical network unit.
Further, this method also comprises:
Two upper united mouths of each optical network unit are connected with two optical modules respectively, and switch switch by one and select one of them optical module to be connected with a PON MAC module; Optical network unit is inner to form the optical link of protection each other by two optical modules.
Further,
When optical network unit detected each other any optical link in the optical link of protection and breaks down, automatic or manual was switched on another corresponding optical link.
Adopt system provided by the invention, device and method, compared with prior art, its starting point is in the protection of the optical link of XPON.By optical link is detected quickly and efficiently, the light signal shake that causes because of noise, fault and manual plug on the filter light link effectively, thus avoid between the optical link of two protections each other, switching continually.
Description of drawings
Fig. 1 is the structured flowchart of realization EPON optical link protection system one embodiment of the present invention;
Fig. 2 is the structured flowchart of another embodiment of realization EPON optical link protection system of the present invention;
Fig. 3 is the structured flowchart of the ONU embodiment of realization EPON optical link protection of the present invention;
Fig. 4 is a structured flowchart of realizing the changeover apparatus embodiment of optical link protection among the ONU shown in Figure 3;
Fig. 5 is the flow chart of realization EPON optical link guard method embodiment of the present invention.
Embodiment
Being described in detail below in conjunction with accompanying drawing and preferred embodiment to technical scheme of the present invention.The embodiment that below exemplifies only is used for description and interpretation the present invention, and does not constitute the restriction to technical solution of the present invention.
As shown in Figure 1, be the networking structure of one embodiment of system of realization EPON optical link provided by the invention protection, this system comprises an optical line terminal (OLT), two optical splitters and two optical network units (ONU), wherein:
OLT is used for being connected with two optical splitters respectively by two second line of a couplet mouths (PON second line of a couplet mouth 1 and PON second line of a couplet mouth 2);
Optical splitter is used for the optical link from a second line of a couplet mouth of OLT is divided into two optical links, and each bar optical link links to each other with the upper united mouth of two ONU respectively;
ONU is used for each upper united mouth is connected with an optical module, and by an either-or switch optical module in two optical modules is connected with PON MAC chip (also claiming PON MAC module).
Each section optical link between OLT and the ONU has all formed two optical links of protection each other, thereby realizes the protection from the up whole optical-fibre channels of ONU.Comprising: form two optical links of protection each other between OLT and two optical splitters, form the optical link of protection each other between each optical splitter and per two ONU, the inner optical link of protection each other that forms by two optical modules of ONU.
System embodiment shown in Figure 1 can expand to the optical link of protection each other that forms between OLT and a plurality of ONU, as shown in Figure 2, and wherein:
Each optical splitter will be divided into N bar optical link from the optical link of a second line of a couplet mouth of OLT with the splitting ratio of 1:N, and each bar optical link links to each other with the upper united mouth of N ONU respectively.Wherein each is to having formed two optical links of protection each other between ONU and an optical splitter.
Fig. 3 expresses the structure of the ONU embodiment among Fig. 1, and each ONU comprises changeover apparatus, optical module 1 and optical module 2 and PON MAC chip (also claiming PON MAC module), wherein:
Changeover apparatus, being used for controlling the inner switch of switching according to the result to optical module 1 and optical module 2 state-detection is to switch to optical module 1 or optical module 2;
Changeover apparatus embodiment shown in Figure 3 (in the frame of broken lines) except switching switch, also comprises a CPU and a CPLD (CPLD, Complex Programmable Logic Device), wherein:
CPLD is used to adopt hardware mode that the state-detection result of optical module 1 and optical module 2 is reported CPU by interrupt signal, and under the control signal effect of CPU alternative is switched switch and switch to optical module 1 or optical module 2;
CPU is used to adopt the optical module 1 that software mode reports according to CPLD and the state-detection result of optical module 2 to control the switching action that alternative is switched switch.
Fig. 4 has represented among the ONU of the present invention to realize the structure of the changeover apparatus embodiment of optical link protection, and this changeover apparatus 200 comprises the optical link detection module 210 that connects successively, switches processing module 230 and switch switch 240, wherein:
Optical link detection module 210 receives the luminous power of two optical modules by the CPLD program and to detect in real time respectively, just produces the alarm interrupt signal and reports and switch processing module 230 when finding that one of them optical module changes;
The above-mentioned processing module 230 of switching both can realize by hardware mode, also can realize by software mode, specifically can be set being provided with on the interface by the system maintenance personnel.Wherein, the advantage that hardware is switched is directly to be switched by hardware, does not need software to participate in, and switching time is fast; The advantage that software is switched is a flexible configuration.
Above-mentioned changeover apparatus embodiment is at optical link detection module 210 and switch and also comprise anti-shake processing module 220 between the processing module 230, wherein:
Optical link detection module 210 one of them optical module of discovery report and switch processing module 230 after changing and just producing the anti-shake processing of alarm interrupt signal by anti-shake processing module 220;
Above-mentioned dithering process module can adopt hardware mode or software mode to carry out anti-shake processing, perhaps adopts the mode of these two kinds of mode combinations to carry out anti-shake processing.
The effect of anti-shake processing module 220 is shakes that noise signal, the light path on the filter light link breaks down and produce during manual plug optical fiber, switches continually between the two-way optical link thereby effectively avoid switching switch 240.
Above-mentioned changeover apparatus embodiment also comprises and switches the protocol process module 250 that switch 240 is connected, wherein:
The setting of above-mentioned protocol process module 250; solved manually to switch and (both can carry out manual switching operation in the OLT side XPON system maintenance personnel; also can carry out manual switching operation in the ONU side) operation demand; also solved simultaneously the demand of doing various concrete protection operations according to attendant's real needs; for example can recover can establish pattern and recovery time etc.; and this protocol process module 250 can be supported various protocols simultaneously, maintains easily personnel's flexible configuration and modification.
In the changeover apparatus embodiment of realization optical link protection shown in Figure 4, optical link detection module 210 is to realize by the program that is carried among the CPLD shown in Figure 3, switching processing module 230 hardware Switch mode then is to realize by the program that is carried among this CPLD, and the software Switch mode then is that CPU shown in Figure 3 realizes; Anti-shake processing module 220 both can also be passed through the anti-shake processing modules implement of software among the CPU by being carried in the anti-shake processing modules implement of the hardware among this CPLD; 250 of protocol process module are to realize by CPU.
The present invention is directed to said system embodiment, realization EPON optical link guard method embodiment also correspondingly is provided, its flow process comprises the steps: as shown in Figure 5
110: set up the optical link protecting network, promptly two of an OLT second line of a couplet mouths are connected with two optical splitters respectively, each optical splitter will be divided into many optical links from the optical link of a second line of a couplet mouth of OLT, and each optical link correspondingly links to each other with two upper united mouths on the ONU on two optical splitters; Form two optical links of protection each other between OLT and two optical splitters, form the optical fiber link of protection each other between each optical splitter and per two ONU;
In setting up this optical link protecting network, comprise that also two upper united mouths of ONU are connected with two optical modules respectively, and select an optical module in two optical modules to be connected with PON MAC module by switch; The inner optical link of protection each other that forms by two optical modules of ONU.
120: when ONU detected each other any optical link in the optical link of protection and breaks down, automatic or manual was switched on another corresponding optical link.
Adopt system provided by the invention, device and method, compared with prior art, its starting point is in the protection of the optical link of XPON.By optical link is detected quickly and efficiently, and the anti-shake and/or anti-shake processing of software of employing hardware, the light signal shake that causes because of noise, fault and manual plug on the filter light link effectively, thus avoid between the optical link of two protections each other, switching continually; By the setting of hardware being switched or software is switched, make that the processing of switching is flexible, the advantage that hardware is switched is directly to be switched by hardware, do not need software to participate in, switching time is fast, need not to be configured to the hardware Switch mode under the situation of manual intervention, and switching operation is stable and speed is very fast; Need manually switch or when doing various concrete protections operations (recovery operation under for example can the recovery pattern and recovery time be provided with etc.) according to attendant's real needs; the configuration software Switch mode; and can support multiple system protocol simultaneously, the operation interface that provides specially for the attendant makes configuration and revise very convenient and flexible.
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to finish by program, described program can be stored in the computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each module in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Claims (16)
1. system that realizes EPON optical link protection comprises: an optical line terminal, two optical splitters and a plurality of optical network unit, wherein:
Described optical line terminal is used for being connected with described two optical splitters respectively by two second line of a couplet mouths;
Described optical splitter is used for the optical link from a second line of a couplet mouth of described optical line terminal is divided into many optical links;
Described optical network unit is used for two upper united mouths are correspondingly linked to each other with each optical link on described two optical splitters respectively;
Form the optical link of protection each other between described optical line terminal and described two optical splitters, form the optical link of protection each other between each optical splitter and per two optical network units.
2. according to the described system of claim 1, it is characterized in that described optical network unit also comprises two optical modules, one and switches switch and a PON MAC module except comprising described two upper united mouths, wherein:
Each upper united mouth in described two upper united mouths of described optical network unit is connected with an optical module, and selects an optical module in described two optical modules to be connected with described PON MAC module by the described switch of switching;
The inner optical link of protection each other that forms by described two optical modules of described optical network unit.
3. according to the described system of claim 2, it is characterized in that the described switch of switching is included in the changeover apparatus in the described optical network unit, wherein:
Described changeover apparatus is used for switching a optical module to described two optical modules according to respectively the state-detection result of described two optical modules being controlled the inner described switch of switching.
4. according to the described system of claim 3, it is characterized in that described changeover apparatus also comprises interconnective optical link detection module and switches processing module except comprising described switching the switch, wherein:
Described optical link detection module is used for the luminous power of described two optical modules received respectively and detects in real time, changes and just produces alarm signal and report the described processing module of switching when detecting one of them optical module;
The described processing module of switching is connected with the described switch of switching, and is used for the described alarm signal that reports according to described optical link detection module, switches switch output and switches control command to described;
The described switch of switching is switched an optical module in described two optical modules is connected with described PON MAC module under the described control of switching control command of switching processing module output.
5. according to the described system of claim 4, it is characterized in that,
The described processing module of switching is set the realization of employing hardware mode or adopts software mode to realize by the interface is set.
6. according to the described system of claim 4, it is characterized in that described changeover apparatus is at described optical link detection module and switch and also comprise anti-shake processing module between the processing module, wherein:
Described optical link detection module detect one of them optical module change produce the hardware or the anti-shake processing of software of alarm signal by described anti-shake processing module after, report the described processing module of switching;
Described anti-shake processing module is used for filtering the shake composition of described alarm signal.
7. according to the described system of claim 4, it is characterized in that described changeover apparatus also comprises with described switches the protocol process module that switch is connected, wherein:
Described protocol process module is used for according to described passive optical network agreement the order of switching of switching order or described optical network unit that described optical line terminal issues being handled, and switches switch output and switch control command to described;
The described switch of switching is switched an optical module in described two optical modules is connected with described PON MAC module under the control of switching control command of described protocol process module output.
8. optical network unit of realizing EPON optical link protection contains two upper united mouths connecting two optical modules respectively, one at least and switches switch and a PON MAC module, wherein:
Two upper united mouths of described optical network unit correspondingly link to each other with each optical link on two optical splitters respectively, select an optical module in described two optical modules to be connected with described PONMAC module by the described switch of switching;
The inner optical link of protection each other that forms by described two optical modules of described optical network unit.
9. according to the described optical network unit of claim 8, it is characterized in that the described switch of switching is included in the changeover apparatus in the described optical network unit, wherein:
Described changeover apparatus is used for switching a optical module to described two optical modules according to respectively the state-detection result of described two optical modules being controlled the inner described switch of switching.
10. according to the described optical network unit of claim 8, it is characterized in that described changeover apparatus also comprises interconnective optical link detection module and switches processing module except comprising described switching the switch, wherein:
Described optical link detection module is used for the luminous power of described two optical modules received and detects in real time respectively, changes and just produces alarm signal and report the described processing module of switching when detecting one of them optical module;
The described processing module of switching is connected with the described switch of switching, and is used for the described alarm signal that reports according to described optical link detection module, switches switch output and switches control command to described;
The described switch of switching is switched an optical module in described two optical modules is connected with described PON MAC module under the described control of switching control command of switching processing module output.
11. according to the described optical network unit of claim 10, it is characterized in that,
The described processing module of switching is set the realization of employing hardware mode or adopts software mode to realize by the interface is set.
12., it is characterized in that described changeover apparatus is at described optical link detection module and switch and also comprise anti-shake processing module between the processing module according to the described optical network unit of claim 10, wherein:
Described optical link detection module detect one of them optical module change produce the hardware or the anti-shake processing of software of alarm signal by described anti-shake processing module after, report the described processing module of switching;
Described anti-shake processing module is used for filtering the shake composition of described alarm signal.
13., it is characterized in that described changeover apparatus also comprises with described switches the protocol process module that switch is connected according to the described optical network unit of claim 10, wherein:
Described protocol process module is used for according to described passive optical network agreement the order of switching of switching order or described optical network unit that described optical line terminal issues being handled, and switches switch output and switch control command to described;
The described switch of switching is switched an optical module in described two optical modules is connected with described PON MAC module under the control of switching control command of described protocol process module output.
14. a method that realizes the protection of EPON optical link comprises:
An optical line terminal is connected with two optical splitters respectively by two second line of a couplet mouths, each optical splitter will be divided into many optical links from the optical link of a second line of a couplet mouth of described optical line terminal, form the optical link of protection each other between described optical line terminal and described two optical splitters;
Each optical link on described two optical splitters correspondingly links to each other the optical link that formation is protected each other between each optical splitter and per two optical network units with two upper united mouths on the optical network unit.
15. in accordance with the method for claim 14, it is characterized in that, also comprise:
Described two upper united mouths of each optical network unit are connected with two optical modules respectively, and switch switch by one and select one of them optical module to be connected with a PON MAC module; Described optical network unit is inner to form the optical link of protection each other by two optical modules.
16. in accordance with the method for claim 15, it is characterized in that,
When described optical network unit detected each other any optical link in the optical link of protection and breaks down, automatic or manual was switched on another corresponding optical link.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010222762.8A CN101877612B (en) | 2010-06-30 | 2010-06-30 | System for protecting optical link of passive optical network, device thereof and method thereof |
| PCT/CN2010/077954 WO2012000254A1 (en) | 2010-06-30 | 2010-10-21 | System, device and method for implementing optical link protection in passive optical network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010222762.8A CN101877612B (en) | 2010-06-30 | 2010-06-30 | System for protecting optical link of passive optical network, device thereof and method thereof |
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| CN101877612A true CN101877612A (en) | 2010-11-03 |
| CN101877612B CN101877612B (en) | 2014-12-31 |
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| CN201010222762.8A Active CN101877612B (en) | 2010-06-30 | 2010-06-30 | System for protecting optical link of passive optical network, device thereof and method thereof |
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| WO2012000254A1 (en) * | 2010-06-30 | 2012-01-05 | 中兴通讯股份有限公司 | System, device and method for implementing optical link protection in passive optical network |
| CN102594444A (en) * | 2011-01-18 | 2012-07-18 | 中兴通讯股份有限公司 | Method and system for achieving full protection modes |
| CN102611519A (en) * | 2010-11-25 | 2012-07-25 | 上海贝尔股份有限公司 | Method and device for link protection of passive optical network |
| WO2012136089A1 (en) * | 2011-04-08 | 2012-10-11 | 中兴通讯股份有限公司 | Loop detection method and system for passive optical network |
| WO2012155671A1 (en) * | 2011-07-26 | 2012-11-22 | 中兴通讯股份有限公司 | Optical port switchover method and system of optical network unit |
| CN102917286A (en) * | 2012-11-19 | 2013-02-06 | 烽火通信科技股份有限公司 | Hand-in-hand protection switching method and system in EPON (Ethernet Passive Optical Network) |
| CN103248419A (en) * | 2013-05-27 | 2013-08-14 | 瑞斯康达科技发展股份有限公司 | ONU (optical network unit), OLT (optical line terminal), D type PON (passive optical network) protecting system and method |
| CN104092582A (en) * | 2014-07-11 | 2014-10-08 | 杭州华三通信技术有限公司 | Method and equipment for detecting link fault |
| CN104836621A (en) * | 2015-05-25 | 2015-08-12 | 博为科技有限公司 | Optical network equipment |
| CN105024857A (en) * | 2015-07-21 | 2015-11-04 | 广州咨元信息科技有限公司 | Method for carrying out automatic analysis on IP network optical power with bypass mode |
| WO2016184242A1 (en) * | 2015-05-18 | 2016-11-24 | 中兴通讯股份有限公司 | Protection switching method and optical network unit |
| WO2017139924A1 (en) * | 2016-02-16 | 2017-08-24 | 华为技术有限公司 | Optical path allocation method and apparatus |
| CN107800473A (en) * | 2016-08-29 | 2018-03-13 | 山东华云光电技术有限公司 | A kind of optical module for possessing automatic switchover defencive function |
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| WO2016172886A1 (en) * | 2015-04-29 | 2016-11-03 | 华为技术有限公司 | Optical splitter, signal transmission method, and passive optical network |
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