CN103281117B - ONU detects also method and the device of adaptive EPON, GPON automatically - Google Patents
ONU detects also method and the device of adaptive EPON, GPON automatically Download PDFInfo
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Abstract
The invention discloses a kind of ONU and automatically detect also method and the device of adaptive EPON, GPON, relate to PON technical field. Method comprises the following steps: electrifying startup ONU, and the current access module parameter of operation ONU, judges that the LOS signal of optical link is eliminated, ONU detects the downlink optical signal of OLT; The framing mode of media access control layer is set according to the current access module of ONU, moves frame according to the framing mode of media access control layer and delimit state machine; Detection duration parameters is set, according to detecting duration parameters, is set detection time; Delimit state machine detection downlink optical signal by described frame and whether reach frame synchronization state, if so, keep the current access module of ONU, otherwise change the current access module of ONU. It can detect the also access module of adaptive OLT automatically, and the scope of application is more extensive, is not only convenient to use and the dilatation of communication system, and effectively utilizes existing resource and layout.
Description
Technical field
The present invention relates to PON (PassiveOpticalNetwork, passive optical-fiber network) skillArt field, is specifically related to a kind of ONU and automatically detects the also method of adaptive EPON, GPONAnd device.
Background technology
At present, broadband access technology is mainly divided into copper wire access technology and light access technology; ?In light access technology, PON is the nothing taking the point-to-multipoint transmission of the single mode bidirectional optical fiber as featureSource optical-fiber network. Shown in Figure 1, PON system comprises: OLT (OpticalLineTerminal,Optical line terminal), ODN (OpticalDistributionNetwork, Optical Distribution Network) andAt least two ONU (OpticalNetworkUnit, optical network unit), OLT and each ONUBetween by ODN transmit ascending data and downlink data.
At present, the main access way in broadband access PON technology is generally EPON(EthernetPassiveOpticalNetwork, Ethernet passive optical network) access technology andGPON (GigabitPassiveOpticalNetwork gigabit passive optical network) accesses skillArt.
The upstream bandwidth of EPON access technology (hereinafter to be referred as EPON) and downlink bandwidth symmetry,Upstream rate and the downstream rate of EPON are 1250Mbps; EPON follows IEEEThe technical standard of 802.3ah, EPON employing MPCP (Multi-PointControlProtocol,Multi-point Control Protocol) and OAM (Operations, AdministrationandMaintenance,Operation Administration and Maintenance) realize connection and management, the up wavelength that EPON adopts is 1310nm,Downstream wavelength is 1490nm.
Upstream bandwidth and the downlink bandwidth of GPON access technology (hereinafter to be referred as GPON) are not rightClaim, the upstream rate of GPON is 1244Mbps, and downstream rate is 2488Mbps. GPONFollow the technical standard of ITU-G.984, it adopts PLOAM (PhysicalLayerOperations, AdministrationandMaintenance, physical layer operations administers and maintains)And OMCI (ONTManagementandControlInterfaceONT, light regime passageInterface) realize the interconnected general character and management. The up wavelength that GPON adopts is 1310nm,Downstream wavelength is 1490nm.
EPON and GPON are in networking form, management mode, business function and operation maintenance etc.Aspect all has great similitude. Because the technology that EPON and GPON adopt is inconsistent,EPON and GPON adopt ONU far end device also inconsistent, so existing ONU is far awayEnd device only can detect and the OLT of adaptive EPON access module or detect and fitJoin the OLT of GPON access module. In the time that communication system needs dilatation, need to be according to ONUThe types of adaptations of far end device, configuration is applicable to the system of EPON or is applicable to GPONSystem; When the types of adaptations of original communication system employing and the adaptive class of later stage dilatation employingWhen type is inconsistent, (for example original communication system adopts GPON, when later stage dilatation, adoptsEPON) types of adaptations or the later stage dilatation that, need to change original communication system employing are adoptedWith types of adaptations, with types of adaptations and later stage dilatation employing that original communication system is adoptedTypes of adaptations coupling. Therefore, the scope of application of existing ONU far end device is more single,Not only bad for use and the dilatation of communication system, and be difficult to effectively utilize existing resource andLayout.
Summary of the invention
For the defect existing in prior art, the object of the present invention is to provide a kind of ONUAutomatically detect also method and the device of adaptive EPON, GPON, it not only can detect automaticallyThe access module of OLT, its detection speed is very fast, and can be according to the access module of OLTThe access module of automatic switchover ONU, ONU can with GPON access module or EPONThe OLT coupling of access module. The scope of application of the present invention is more extensive, is not only convenient to communicationThe use of system and dilatation, and effectively utilize existing resource and layout.
For reaching above object, the technical scheme that the present invention takes is: ONU provided by the inventionAutomatically detect the also method of adaptive EPON, GPON, it is characterized in that, comprise the following steps:A, electrifying startup ONU, read and move the current access module parameter of ONU, access mouldFormula parameter is GPON pattern or EPON pattern; Detect the state of optical link, judge lightThe LOS signal of link is eliminated, and ONU detects the downlink optical signal of OLT; B, basisThe current access module of ONU arranges the framing mode of media access control layer, connects according to mediaThe framing mode that enters key-course is moved frame demarcation state machine; C, arrange and read and detect duration ginsengNumber, arranges detection time according to detecting duration parameters; Within detection time, by describedFrame is delimited state machine and is detected downlink optical signal and whether reach frame synchronization state, if so, markThe current access module of the ONU access module current with OLT is consistent, forwards step e to, noThe current access module of the current access module of mark ONU and OLT is inconsistent, forwards step toRapid D; D, the current access module of replacing ONU, forward step B to; E, complete ONUDetection with adaptive, the normal standby of ONU.
On the basis of technique scheme, in steps A, after electrifying startup ONU, also wrapDraw together following steps: on ONU, set in advance access module parameter and be GPON pattern orEPON pattern.
On the basis of technique scheme, step D before forwarding step B to, comprise withLower flow process: the access module parameter setting in advance is replaced by the current access module ginseng of ONUNumber, increases to the detection duration parameters setting in advance more than 1.3 times.
On the basis of technique scheme, in steps A, judge that the LOS signal of optical link disappearsThe step of removing comprises: whether the LOS signal that judges optical link is in the process of ONU electrifying startupMiddle elimination, if so, determines that the LOS signal of optical link is the process at ONU electrifying startupMiddle elimination, reads the access module parameter setting in advance, and according to access module parameter, ONU is setCurrent access module, and forward step B to; Otherwise determine the LOS signal of optical link beAfter plugging optical fiber in the process of the normal work of ONU or changing optical fiber, eliminate; Directly forward step toB；
Or whether the LOS signal that judges optical link plugs in the process of the normal work of ONUAfter optical fiber or replacing optical fiber, eliminate, if so, determine that the LOS signal of optical link is at ONUAfter plugging optical fiber in the process of normal work or changing optical fiber, eliminate, directly forward step B to; NoThe LOS signal of determining optical link is to eliminate in the process of ONU electrifying startup, reads pre-The access module parameter first arranging, arranges the current access mould of ONU according to access module parameterFormula, and forward step B to.
On the basis of technique scheme, steps A is further comprising the steps of: judge light chainThe LOS signal on road is not eliminated, and again detects the state of optical link.
On the basis of technique scheme, step B comprises following flow process: ONU is currentWhen access module is GPON access module, media access control layer is at descending 2488MbpsGPON pattern under work, media access control layer is according to the technical standard of ITU-G.984,Operation GPON frame is delimited state machine; The current access module of ONU is EPON access moduleTime, media access control layer is worked under the ethernet frame pattern of descending 1250Mbps, mediaAccess control layer is according to the technical standard of IEEE802.3ah, and operation EPON frame is delimited stateMachine.
On the basis of technique scheme, if the descending light letter that in step C, ONU receivesNumber reach frame synchronization state, judgment frame is delimited state machine to detect that ONU receives descendingOptical signal reaches the frame synchronization state time used and whether exceedes 1000 milliseconds, if so, will establishThe detection duration parameters of putting is replaced by frame demarcation state machine and the descending light that ONU receives detectedSignal reaches the detection duration parameters of frame synchronization state time used, otherwise by the detection arrangingDuration parameters is replaced by 1000 milliseconds.
On the basis of technique scheme, in step D, change the current access module of ONUComprise when the current access module of following flow process: ONU is GPON access module, by GPONAccess module is replaced by EPON access module; The current access module of ONU is that EPON connectsWhile entering pattern, EPON access module is replaced by GPON access module.
Provided by the inventionly automatically detect and adaptive EPON, GPON based on above-mentioned ONUThe device of method, is characterized in that, comprising:
Optical link signal judge module, for: electrifying startup ONU, reads and moves ONUCurrent access module parameter, access module parameter is GPON pattern or EPON pattern;The state that detects optical link, judges whether the LOS signal of optical link is eliminated, if so, ONUReceive the downlink optical signal of OLT, delimit state machine operation module to frame and send working signal;Otherwise again detect the state of optical link;
Frame is delimited state machine operation module, for: receive optical link signal judge module orAfter the working signal that person's access module handover module sends, the access module current according to ONUThe framing mode of media access control layer is set, transports according to the framing mode of media access control layerRow frame is delimited state machine; Send working signal to access module detection module;
Access module detection module, for: receive frame and delimit that state machine operation module sendsAfter working signal, arrange and read detection duration parameters, according to detecting duration parameters, detection is setTime; Within detection time, the frame moving by media access control layer is delimited state machineDetect described downlink optical signal and whether reach frame synchronization state, if so, mark ONU is currentThe access module access module current with OLT consistent, to ONU standby module transmission workSignal, otherwise the current access module of the current access module of mark ONU and OLT is inconsistent,Send working signal to access module handover module;
Access module handover module, for: receive the work that access module detection module sendsAfter signal, record frame demarcation state machine and detect that the downlink optical signal that ONU receives reaches frameThe time that synchronous regime is used, the detection duration parameters of setting is replaced by the frame demarcation state that recordsMachine examination measure downlink optical signal that ONU receives reach the frame synchronization state time used timeLong parameter; Delimit state machine operation module to frame and send working signal;
ONU standby module, for: receive access module detection module or access moduleAfter the working signal that handover module sends, complete the detection of ONU with adaptive, ONU normally treatsMachine.
On the basis of technique scheme, described optical link signal judge module comprises:
Access module setting unit, for: on ONU, setting in advance access module parameter isGPON pattern or EPON pattern;
Optical link signal is eliminated state detection unit, for:
Whether the LOS signal that judges optical link is eliminated in the process of ONU electrifying startup, ifBe, determine that the LOS signal of optical link is to eliminate in the process of ONU electrifying startup, readGet the access module parameter setting in advance, according to access module parameter, current the connecing of ONU is setEnter pattern, delimit state machine operation module to frame and send working signal; Otherwise definite optical linkLOS signal is to eliminate after plugging optical fiber or change optical fiber in the process of the normal work of ONU;Directly delimit state machine operation module to frame and send working signal;
Or whether the LOS signal that judges optical link plugs in the process of the normal work of ONUAfter optical fiber or replacing optical fiber, eliminate, if so, determine that the LOS signal of optical link is at ONUAfter plugging optical fiber in the process of normal work or changing optical fiber, eliminate, directly delimit state machine to frameOperation module sends working signal; Otherwise the LOS signal of determining optical link is to power at ONUIn the process starting, eliminate, read the access module parameter setting in advance, join according to access moduleNumber arranges the current access module of ONU, delimits state machine operation module transmission work letter to frameNumber.
Described access module detection module comprises:
Detect duration record cell, for: the downlink optical signal receiving as ONU reaches frameWhen synchronous regime, judgment frame is delimited state machine and is detected that the downlink optical signal that ONU receives reachesWhether exceed 1000 milliseconds to the frame synchronization state time used, if so, by the detection arrangingDuration parameters is replaced by frame demarcation state machine and detects that the downlink optical signal that ONU receives reachesThe detection duration parameters of frame synchronization state time used, otherwise by the detection duration parameters arrangingBe replaced by 1000 milliseconds;
Described access module handover module comprises:
Detect duration updating block, for: the access module parameter setting in advance is replaced byThe access module parameter that ONU is current, increases to 1.3 by the detection duration parameters setting in advanceDoubly.
Compared with prior art, beneficial effect of the present invention is:
(1) the present invention disappears when LOS (lossofsignal, the dropout) signal of optical linkWhile removing, ONU detects the downlink optical signal of OLT, the access module current according to ONU,Media access control layer according to ITU-G.984 (technical standard of GPON access module) orIEEE802.3ah (the technology mark of EPON access module) operation frame is delimited state machine, logicalCrossing frame delimits state machine downlink optical signal that ONU is detected and detects. In detection timeIn scope, frame is delimited state machine and is detected that descending smooth model reaches frame synchronization, proves ONUCurrent access module is consistent with the access module of OLT, does not need to change current the connecing of ONUEnter pattern; Frame is delimited state machine and is detected that downlink optical signal does not reach frame synchronization, proves ONUCurrent access module and the access module of OLT are inconsistent, need to change current the connecing of ONUEnter pattern. The present invention can detect the access module of OLT, according to the access module of OLT moreChange the current access module of ONU, make the access module of ONU and the access module of OLTAdaptive. Therefore, can make ONU be applicable to GPON access mould by method of the present inventionThe OLT of formula and EPON access module, the scope of application is more extensive, is not only convenient to communication systemUse and the dilatation of system, and in the time that the ONU access module used from OLT is different, do not needChange the equipment of ONU local side, effectively utilize existing resource and layout.
(2), when the present invention uses, while only having the LOS signal elimination of optical link, ONUCarry out the detection of access module, ONU, in the time of work, only needs to detect the LOS signal of optical linkWhether eliminate, whether the access module that ONU not only can detect OLT in real time changes,And lower to the occupancy of system, be difficult for affecting user's normal use.
(3) the present invention judges when the LOS signal of optical link is eliminated, and can judge optical linkThe situation that LOS signal is eliminated. The LOS signal of ONU optical link in the process of electrifying startupWhen elimination, can predict that the current access module of the access module of OLT and ONU is inconsistent,Suppose that, after ONU electrifying startup, the access module of OLT can not change, the access module of OLTCan predict consistent with the access module setting in advance. In the time that ONU normally works, at ONUAfter upper plug optical fiber or replacing optical fiber, the LOS signal of optical link is eliminated, and may be to send out suddenlyThe optical signal of raw disconnected fine or optical link deteriorated, the access module of OLT does not change.The access module that situation about therefore, eliminating according to the LOS signal of optical link arranges ONUThe access module that the prediction ONU of large limit mates with OLT can be accelerated to detect next timeThe detection speed of ONU access module.
(4) the present invention has recorded frame demarcation state machine and has detected that downlink optical signal reaches frame synchronizationThe time (hereinafter to be referred as the current detection time) of Shi Suoyong, and by the detection of current detection timeDuration parameters is set to the detection duration parameters that used next time. Because the detection of current detection timeDuration parameters is less than the detection duration parameters setting in advance for the first time, so by the current detection timeDetect duration parameters and be set to the detection duration parameters that used next time, can shorten next time and detectThe required detection time of access module of ONU, accelerate to detect the required access mould of ONU next timeThe detection speed of formula. Therefore the present invention can be fast to the access module of ONU detect,And carry out adaptation with the access module of OLT.
(5) the present invention detects connecing of ONU using the access module parameter after adaptation as next timeEnter pattern access module parameter used; Because the access module parameter after adaptation is ONU instituteNeed the accurate parameter of access module, therefore the access module parameter after adaptation was detected as next timeThe access module access module parameter used of ONU, not only can further ensure to establish in advanceThe accuracy of the access module parameter of putting, and can shorten detection time.
Brief description of the drawings
Fig. 1 is the structured flowchart of conventional P ON system;
Fig. 2 is that in the embodiment of the present invention, ONU automatically detects and adaptive EPON, GPONThe flow chart of method.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Shown in Figure 2, the ONU that the embodiment of the present invention provides automatically detects and is adaptiveThe method of EPON, GPON, comprises the following steps:
S1: electrifying startup ONU (OpticalNetworkUnit, optical network unit), powers onStart ONU, read and move the current access module parameter of ONU, access module parameter isGPON pattern or EPON pattern; On ONU, set in advance access module parameter, connectEnter mode parameter according to the environment of opening of concrete engineering, be set to GPON pattern or EPONPattern.
S2: detect the state of optical link, judge LOS (lossofsignal, the letter of optical linkNumber lose) whether signal eliminate, and if so, ONU detects the downlink optical signal of OLT,Forward step S3 to, otherwise re-execute step S2.
In PON (PassiveOpticalNetwork, passive optical-fiber network) system, adoptWith optical module follow SFF8472 standard, ONU by SFF (SmallFormFactor,Little encapsulation technology) optical module judges whether the LOS signal of optical link is eliminated. SFF lightModule judges that the step whether the LOS signal of optical link has been eliminated is: the LOS letter of optical linkNumber by RX_SD (RXsignaldetect the receives optical signal detecting) pin of SFF optical moduleExport the control and management pin of CPU (CentralProcessingUnit, central processing unit) to;Judge whether CPU produces interruption, if so, the LOS signal of optical link is eliminated, otherwiseThe LOS signal of optical link is not eliminated.
2 kinds of situations that the LOS signal of optical link is eliminated are:
(1) ONU is in the process of electrifying startup, and the LOS signal of optical link is eliminated;
(2) ONU plugs optical fiber or changes after optical fiber optical link in the process of normal workLOS signal eliminate.
Do not belong to situation (1) if the LOS signal of optical link is eliminated, be automatically defaulted as situation(2)。
S3: the LOS signal of determining optical link is to eliminate in the process of ONU electrifying startup,Or after plugging optical fiber or change optical fiber in the process of the normal work of ONU, eliminate, if light chainThe LOS signal on road is to eliminate in the process of ONU electrifying startup, forwards step S4 to,If the LOS signal of optical link is to plug optical fiber or change light in the process of the normal work of ONUAfter fine, eliminate, forward step S5 to.
Shown in Figure 2, the LOS signal of determining optical link is the mistake at ONU electrifying startupIn journey, eliminate, or disappear after plugging optical fiber or change optical fiber in the process of the normal work of ONUThe concrete steps of removing are: whether the LOS signal that judges optical link is in the mistake of ONU electrifying startupIn journey, eliminate, if so, forward step S4 to; Otherwise, forward step S5 to; In practical applicationIn, can also judge whether the LOS signal of optical link is inserted in the process of the normal work of ONUAfter pulling out optical fiber or changing optical fiber, eliminate, if so, forward step S5 to; Otherwise, forward step toS4。
S4: read the access module parameter setting in advance, according to access module parameter, ONU is setAccess module: in the time that access module parameter is GPON pattern, the access module of ONU is establishedBe set to GPON pattern, in the time that access module parameter is EPON pattern, the access mould of ONUFormula is set to EPON pattern, then forwards step S5 to;
S5: MAC layer (MediaAccess is set according to the current access module of ONUControl, media Access Control) framing mode, move according to the framing mode of MAC layerFrame is delimited state machine.
In the time that the current access module of ONU is GPON access module, MAC layer is descendingUnder GEM (G-PON Encapsulation Mode) frame pattern of 2488Mbps, work, be operated in GPONThe MAC layer of pattern is according to the technical standard of ITU-G.984, and operation GPON frame is delimited stateMachine; In the time that the current access module of ONU is EPON access module, MAC layer is descendingUnder the ethernet frame pattern of 1250Mbps, work, be operated in the MAC layer root of EPON patternAccording to the technical standard of IEEE802.3ah, operation EPON frame is delimited state machine.
S6: detection duration parameters is set, detects open-minded that duration parameters can be according to concrete engineeringEnvironment arranges, also can be according to OLT's (OpticalLineTerminal, optical line terminal)Start-up time and fluorescent lifetime setting can also default setting be default value, according to a large amount of realitiesTest and working experience, default value is generally 3000 milliseconds.
S7: read detection duration parameters, according to detecting duration parameters, be set detection time; In inspectionIn survey time range, the frame moving by MAC layer is delimited state machine detection ONU and is receivedDownlink optical signal whether reach frame synchronization state, the if so, current access of mark ONUThe pattern access module current with OLT is consistent; Judgment frame is delimited state machine and is detected that ONU connectsThe downlink optical signal of receiving reaches the frame synchronization state time used (during hereinafter to be referred as current detectionBetween) whether exceed 1000 milliseconds, if so, the detection duration parameters setting in advance is replaced byThe detection duration parameters of current detection time, otherwise the detection duration parameters setting in advance is changedIt is 1000 milliseconds.
The current detection time, while not exceeding 1000 milliseconds, the current detection time was less, now needsTo delimit state machine detection downlink optical signal for frame and reach the reserved regular hour of frame synchronization state,Delimit state machine and can within the sufficient time, detect that downlink optical signal reaches frame to ensure frameSynchronous regime.
Forward step S10 to, otherwise current access module and current the connecing of OLT of mark ONUEnter pattern inconsistent, forward step S8 to.
In GPON system, ITU-G.984 specifies each GEM (GPONEncapsulation_Method, G-PON Encapsulation Mode) frame is 125 microseconds, by descendingIn frame structure, synchronous (Psync) field of physics completes frame bound search, and physics synchronization field approximatelyBe decided to be 0xB6AB31E0; In EPON system, the specific preamble by 8 bytes andFrame delimiter completes frame bound search, is approximately decided to be the order that 0x55 starts in IEEE802.3ahRow word string.
Within detection time, the downlink optical signal that ONU receives reaches frame synchronization stateTime, the current access module of ONU is consistent with the access module of OLT, does not need to change ONUAccess module; Within detection time, the downlink optical signal that ONU receives does not reachDuring to frame synchronization state, the access module that ONU is current and the access module of OLT are inconsistent,Need to change the access module of ONU. The access mould that the access module of OLT and ONU are currentWhen formula is inconsistent, according to the IEEE802.3ah technical standard of EPON and GPONITU-G.984 standard, although ONU can receive downlink optical signal, under receivingTraveling optical signal can not reach frame synchronization state.
S8: by the access module adaptation of access module current ONU and OLT, work as ONUWhen current access module is GPON access module, ONU according to EPON access module justNormal work; In the time that the current access module of ONU is EPON access module, EPON is connectEnter pattern and be replaced by GPON access module, ONU normally works according to GPON access module,Forward step S9 to.
S9: the access module parameter setting in advance is replaced by the current access module ginseng of ONUNumber; The current detection time is increased to more than 1.3 times, the detection duration parameters after record increases,Forward step S7 to.
Change after the current access module of ONU, according to access module parameter and increasing after changingDetection duration parameters after large, the ONU after access module is changed re-starts detection, withDetermine access module change after ONU consistent with the access module of OLT, ensure ONU withThe normal work of OLT.
S10: the detection duration parameters that the detection duration parameters setting in advance is replaced by record.
In the time that the current access module of the ONU access module current with OLT is consistent, stepDetection duration parameters in S10 is the detection duration of current detection time of recording in step S7Parameter; When the current access module of ONU and the current access module of OLT are when inconsistent, S10In detection duration parameters be in step S9 increase after detection duration parameters.
S11: complete the detection of ONU with adaptive, the normal standby of ONU.
If the LOS signal of optical link occurs after elimination, cannot continue to detect and adaptationThe access module of ONU and OLT, therefore, in the process of step S2 to S11, if lightThe LOS signal of link occurs after elimination, re-executes step S2.
If need to again switch the access module of ONU, detect duration parameters and be set to stepDetection duration parameters in S10, detects duration parameters and access module parameter and is directly set toDetection duration parameters after inferior being used to complete and access module parameter.
The operation principle of the inventive method is described below:
When the LOS signal of optical link is eliminated, ONU can receive descending downlink optical signal,And then being linked into PON system, ONU understands and OLT (Optical after being linked into PON systemLineTerminal, optical line terminal) generation association. For ONU is carried out normallyBusiness transmitting-receiving, ONU need to register on OLT, so that OLT management ONU, therefore,The access module of ONU need to be consistent with the access module of OLT. The access module of OLT occursWhen change, can produce the elimination of the LOS signal of optical link, only have the LOS signal of optical link to disappearWhile removing, ONU just carries out the detection of access module, and ONU, in the time of work, only needs to detect light chainWhether the LOS signal on road is eliminated, and ONU not only can detect the access module of OLT in real timeWhether change, and lower to the occupancy of system, be difficult for affecting user's normal use.
If the LOS signal ONU of optical link eliminates in the process of electrifying startup, can predictThe current access module of the access module of OLT and ONU is inconsistent, supposes that ONU powers on to openAfter moving, the access module of OLT can not change, and the access module of OLT can be predicted with in advanceThe access module arranging is consistent. In the time that ONU normally works, on ONU, plug optical fiber orChange the LOS signal of optical link after optical fiber and eliminate, may be occur suddenly disconnected fibre orThe optical signal of optical link deteriorated, the access module of OLT does not change. Therefore, according toIt is pre-to greatest extent that the situation that the LOS signal of optical link is eliminated arranges the access module of ONUSurvey the access module that ONU mates with OLT, not only can not omit access module contingentChange, and can accelerate to detect the detection speed of ONU access module.
The present invention has recorded the detection duration parameters of current detection time, and by the current detection timeDetection duration parameters be set to next time use detection duration parameters. Because frame is delimited state machineDetect that the time that downlink optical signal reaches frame synchronization is less than the time setting in advance, therefore will be pre-The larger detection duration parameters first arranging is replaced by current less detection duration parameters, canShorten and detect ONU access module required detection time next time, accelerate to detect next timeThe detection speed of the required access module of ONU.
The present invention detects the access module of ONU using the access module parameter after replacing as next timeAccess module parameter used, because the access module parameter after changing is the required access of ONUThe accurate parameter of pattern, is therefore replaced by connecing after replacing by the access module parameter setting in advanceEnter mode parameter, can further ensure the accuracy of the access module parameter setting in advance, contractingShort detection time next time.
In the time that OLT breaks down, the downlink optical signal that ONU receives is in scope detection timeInside can not reach frame synchronization state; Therefore the downlink optical signal, receiving as ONU is detectingWhile not reaching frame synchronization state in time range, upgrade the detection duration parameters setting in advance, itsRenewal process detects duration parameters for extending, so as reserved OLT after breaking down, repair timeBetween. Draw through a large amount of experiment and experiences, the detection duration parameters setting in advance is increased toMore than 1.3 times, as the detection duration parameters after upgrading. Detecting duration parameters also can be specificallyEngineering-environment learning, optimization, with adaptive concrete engineering environment, further accelerate to detectThe detection speed of the required access module of ONU.
What the embodiment of the present invention provided detects and adaptive EPON, GPON automatically based on ONUThe device of method, comprising:
Optical link signal judge module, for: electrifying startup ONU, reads and moves ONUCurrent access module parameter, access module parameter is GPON pattern or EPON pattern;The state that detects optical link, judges whether the LOS signal of optical link is eliminated, if so, ONUReceive the downlink optical signal of OLT, delimit state machine operation module to frame and send working signal;Otherwise again detect the state of optical link.
Optical link signal judge module comprises:
Access module setting unit, for: on ONU, setting in advance access module parameter isGPON pattern or EPON pattern;
Optical link signal is eliminated state detection unit, for:
Whether the LOS signal that judges optical link is eliminated in the process of ONU electrifying startup, ifBe, determine that the LOS signal of optical link is to eliminate in the process of ONU electrifying startup, readGet the access module parameter setting in advance, according to access module parameter, current the connecing of ONU is setEnter pattern, delimit state machine operation module to frame and send working signal; Otherwise definite optical linkLOS signal is to eliminate after plugging optical fiber or change optical fiber in the process of the normal work of ONU;Directly delimit state machine operation module to frame and send working signal;
Or whether the LOS signal that judges optical link plugs in the process of the normal work of ONUAfter optical fiber or replacing optical fiber, eliminate, if so, determine that the LOS signal of optical link is at ONUAfter plugging optical fiber in the process of normal work or changing optical fiber, eliminate, directly delimit state machine to frameOperation module sends working signal; Otherwise the LOS signal of determining optical link is to power at ONUIn the process starting, eliminate, read the access module parameter setting in advance, join according to access moduleNumber arranges the current access module of ONU, delimits state machine operation module transmission work letter to frameNumber.
Frame is delimited state machine operation module, for: receive optical link signal judge module orAfter the working signal that person's access module handover module sends, the access module current according to ONUThe framing mode of media access control layer is set, transports according to the framing mode of media access control layerRow frame is delimited state machine; Send working signal to access module detection module.
Access module detection module, for: receive frame and delimit that state machine operation module sendsAfter working signal, arrange and read detection duration parameters, according to detecting duration parameters, detection is setTime; Within detection time, the frame moving by media access control layer is delimited state machineDetect downlink optical signal and whether reach frame synchronization state, if so, current the connecing of mark ONUEnter the pattern access module current with OLT consistent, send working signal to ONU standby module,Otherwise the current access module of the access module that mark ONU is current and OLT is inconsistent, to connecingEnter mode switch module and send working signal;
Access module detection module comprises:
Detect duration record cell, for: the downlink optical signal receiving as ONU reaches frameWhen synchronous regime, judgment frame is delimited state machine and is detected that the downlink optical signal that ONU receives reachesWhether exceed 1000 milliseconds to the frame synchronization state time used, if so, by the detection arrangingDuration parameters is replaced by frame demarcation state machine and detects that the downlink optical signal that ONU receives reachesThe detection duration parameters of frame synchronization state time used, otherwise by the detection duration parameters arrangingBe replaced by 1000 milliseconds.
Access module handover module, for: receive the work that access module detection module sendsAfter signal, record frame demarcation state machine and detect that the downlink optical signal that ONU receives reaches frameThe time that synchronous regime is used, the detection duration parameters of setting is replaced by the frame demarcation state that recordsMachine examination measure downlink optical signal that ONU receives reach the frame synchronization state time used timeLong parameter; Delimit state machine operation module to frame and send working signal.
Access module handover module comprises:
Detect duration updating block, for: the access module parameter setting in advance is replaced byThe access module parameter that ONU is current, increases to 1.3 by the detection duration parameters setting in advanceDoubly.
ONU standby module, for: receive access module detection module or access moduleAfter the working signal that handover module sends, complete the detection of ONU with adaptive, ONU normally treatsMachine.
Describe method of the present invention in detail by three embodiment below.
Embodiment 1: using first method of the present invention, is that GPON connects by current access moduleThe ONU that enters pattern accesses to EPON system.
Electrifying startup ONU, reads and moves GPON pattern, on ONU, sets in advanceAccess module parameter is GPON pattern. Detect the state of optical link, the LOS letter of optical linkNumber in the process of ONU electrifying startup, eliminate. Read GPON pattern, according to GPON mouldThe access module of formula ONU is set to GPON access module; Read detection duration parameters,Be set to 3000 milliseconds detection time according to detecting duration parameters. According to GPON access mouldFormula arranges the framing mode of MAC layer, and MAC layer is at the GEM of descending 2488Mbps frame mouldUnder formula, work, be operated in the MAC layer of GPON pattern according to the technical standard of ITU-G.984,Operation GPON frame is delimited state machine, and the synchronous characteristic string that frame demarcation state machine is set is0xB6AB31E0. Setting in advance and detecting duration parameters is 3000 milliseconds, reads detection durationParameter, within the detection time of 3000 milliseconds, the GPON moving by MAC layerWhether the downlink optical signal that frame demarcation state machine detection ONU receives reaches frame synchronization state;Because OLT adopts EPON access module, therefore adopt 125 delicate every GEM frame searchThe operation meeting that frame head is delimited is always in search condition, and the downlink optical signal that ONU receives is notCan reach frame synchronization state.
The current access module of the access module that mark ONU is current and OLT is inconsistent, willThe access module of ONU is replaced by EPON access module by GPON access module, upgrades pre-The detection duration parameters first arranging, increases to 4000 millis by the detection duration parameters setting in advanceSecond, the access module parameter setting in advance is replaced by EPON pattern by GPON pattern.The framing mode that resets MAC layer according to EPON access module, MAC layer is descendingUnder the ethernet frame pattern of 1250Mbps, work, be operated in the MAC layer root of EPON patternAccording to the technical standard of IEEE802.3ah, operation EPON frame is delimited state machine, frame is set fixedThe synchronous characteristic string of boundary's state machine is 0x55 character string sequence. Read and set in advance detection durationParameter (4000 milliseconds), within the detection time of 4000 milliseconds, transports by MAC layerWhether the downlink optical signal that the EPON frame demarcation state machine detection ONU of row receives reaches frameSynchronous regime.
Adopt EPON access module ONU can with the OLT that adopts EPON access moduleAdaptation, MAC layer operates under the technical standard of IEEE802.3ah, due to ONU and OLTAccess module is identical, and therefore frame is delimited the descending light that state machine can receive ONU rapidlySignal determining is frame synchronization. Record the current detection time, because the current detection time is 2000Delicate, be less than 1000 milliseconds of minimum detection duration parameters values, so by the detection setting in advanceDuration parameters is replaced by 1000 milliseconds of minimum detection duration parameters values. The normal standby of ONU, OLTLocal side is found ONU, is carried out the workflows such as ONU registration.
Embodiment 2: on the basis of embodiment 1, the ONU of EPON access module is connectEnter the system to GPON.
Electrifying startup ONU, reads and moves EPON pattern, detects the state of optical link,The LOS signal of optical link is eliminated in the process of ONU electrifying startup. Read EPON mouldFormula, is set to EPON access module according to the access module of EPON pattern ONU. RootThe framing mode that MAC layer is set according to EPON access module, MAC layer is descendingUnder the ethernet frame pattern of 1250Mbps, work, be operated in the MAC layer root of EPON patternAccording to the technical standard of IEEE802.3ah, operation EPON frame is delimited state machine, frame is set fixedThe synchronous characteristic string of boundary's state machine is 0x55 character string sequence. After reading in embodiment 1 and changingDetection duration parameters, according to detect duration parameters be set to 1000 milliseconds detection time,Within the detection time of 1000 milliseconds, the EPON frame moving by MAC layer is delimitedWhether the downlink optical signal that state machine detection ONU receives reaches frame synchronization state; Due toOLT adopts GPON access module, therefore adopts 125 delicate every GEM frame search frame heads fixedThe operation meeting on boundary is always in search condition, and the downlink optical signal that ONU receives can not reachFrame synchronization state.
The current access module of the access module that mark ONU is current and OLT is inconsistent, willThe access module of ONU is replaced by GPON access module by EPON access module, will be in advanceThe detection duration parameters arranging increases to 1300 milliseconds, by the access module parameter setting in advanceBe replaced by GPON pattern by EPON pattern. Reset according to GPON access moduleThe framing mode of MAC layer, MAC layer is work under the GEM of descending 2488Mbps frame patternDo, be operated in the MAC layer of GPON pattern according to the technical standard of ITU-G.984, operationGPON frame is delimited state machine, and the synchronous characteristic string that frame demarcation state machine is set is0xB6AB31E0. Setting in advance and detecting duration parameters is 1300 milliseconds, reads detection durationParameter, within the detection time of 1300 milliseconds, the GPON moving by MAC layerWhether the downlink optical signal that frame demarcation state machine detection ONU receives reaches frame synchronization state.
Adopt GPON access module ONU can with the OLT that adopts GPON access moduleAdaptation, MAC layer operates under the technical standard of ITU-G.984, due to ONU and OLTAccess module is identical, and therefore frame is delimited the descending light that state machine can receive ONU rapidlySignal determining is frame synchronization. Record the current detection time, because the current detection time is 500 micro-Wonderful, be less than 1000 milliseconds of minimum detection duration parameters values, so by set in advance detection timeLong parameter is replaced by 1000 milliseconds of minimum detection duration parameters values. The normal standby of ONU, OLTLocal side is found ONU, is carried out the workflows such as ONU registration.
Embodiment 3: on the basis of embodiment 2, the ONU of GPON access module is connectEnter the system to GPON.
Electrifying startup ONU, reads and moves GPON pattern, detects the state of optical link,On ONU, plug optical fiber or change after optical fiber, the LOS signal of optical link is eliminated. According toGPON access module arranges the framing mode of MAC layer, and MAC layer is at descending 2488MbpsGEM frame pattern under work, be operated in the MAC layer of GPON pattern according to ITU-G.984Technical standard, operation GPON frame is delimited state machine, frame is set and delimits the synchronous of state machineFeature string is 0xB6AB31E0. Read the detection duration parameters after renewal in embodiment 2, rootBe set to 1000 milliseconds detection time according to detecting duration parameters; In the time of the detection of 1000 millisecondsBetween in scope, the GPON frame moving by MAC layer is delimited state machine and is detected ONU and receiveTo downlink optical signal whether reach frame synchronization state; Because OLT adopts GPON access mouldFormula, therefore adopts 125 delicate every GEM frame search frame head demarcation ONU can be detected rapidlyThe downlink optical signal receiving reaches frame synchronization state. In theory, due to continuous 2GEM frame is 250 delicate, and therefore 125 delicate every GEM frame search frame heads are only delimited and needed 1Millisecond can reach frame synchronization state and end mode detection. Record the current detection time, currentBe 500 delicate detection time, is less than 1000 milliseconds of minimum detection duration parameters values, so willThe detection duration parameters setting in advance is replaced by 1000 milliseconds of minimum detection duration parameters values.
The current access module of the mark ONU access module current with OLT is consistent, does not needChange the current access module of ONU. Adopt GPON access module ONU can with adoptBy the OLT adaptation of GPON access module, MAC layer operates in the technical bid of ITU-G.984Under standard, because ONU is identical with OLT access module, therefore frame demarcation state machine can be rapidThe downlink optical signal that ONU is received is judged to be frame synchronization. The normal standby of ONU, OLTLocal side is found ONU, is carried out the workflows such as ONU registration.
The present invention is not limited to above-mentioned embodiment, for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications,Within these improvements and modifications are also considered as protection scope of the present invention. In this description, do not do in detailThe content of describing belongs to the known prior art of professional and technical personnel in the field.
Claims (10)
1. ONU detects an also method of adaptive EPON, GPON automatically, and its feature existsIn, comprise the following steps:
A, electrifying startup ONU, read and move the current access module parameter of ONU, connectsEntering mode parameter is GPON pattern or EPON pattern; Detect the state of optical link, sentenceDetermine the LOS signal of optical link and eliminate, ONU detects the downlink optical signal of OLT;
B, the framing mode of media access control layer is set according to the current access module of ONU,Move frame according to the framing mode of media access control layer and delimit state machine;
C, arrange and read detection duration parameters, according to detecting duration parameters, be set detection time;Within detection time, delimit state machine detection downlink optical signal by described frame and whether reachFrame synchronization state, the if so, current access of the current access module of mark ONU and OLTPattern is consistent, forwards step e to, otherwise current access module and the OLT of mark ONU is currentAccess module inconsistent, forward step D to;
D, the current access module of replacing ONU, forward step B to;
E, the detection that completes ONU and adaptation, the normal standby of ONU.
2. ONU as claimed in claim 1 automatically detects and adaptive EPON, GPONMethod, is characterized in that, after electrifying startup ONU, further comprising the steps of in steps A:On ONU, setting in advance access module parameter is GPON pattern or EPON pattern.
3. ONU as claimed in claim 2 automatically detects and adaptive EPON, GPONMethod, is characterized in that, step D, before forwarding step B to, comprises following flow process: willThe access module parameter setting in advance is replaced by the current access module parameter of ONU, will be in advanceThe detection duration parameters arranging increases to more than 1.3 times.
4. ONU as claimed in claim 2 automatically detects and adaptive EPON, GPONMethod, is characterized in that, judges the step bag of the LOS signal elimination of optical link in steps ADraw together: whether the LOS signal that judges optical link is eliminated in the process of ONU electrifying startup, ifBe, determine that the LOS signal of optical link is to eliminate in the process of ONU electrifying startup, readGet the access module parameter setting in advance, according to access module parameter, current the connecing of ONU is setEnter pattern, and forward step B to; Otherwise the LOS signal of determining optical link is normal at ONUAfter plugging optical fiber in the process of work or changing optical fiber, eliminate, directly forward step B to;
Or whether the LOS signal that judges optical link plugs in the process of the normal work of ONUAfter optical fiber or replacing optical fiber, eliminate, if so, determine that the LOS signal of optical link is at ONUAfter plugging optical fiber in the process of normal work or changing optical fiber, eliminate, directly forward step B to; NoThe LOS signal of determining optical link is to eliminate in the process of ONU electrifying startup, reads pre-The access module parameter first arranging, arranges the current access mould of ONU according to access module parameterFormula, and forward step B to.
ONU as described in claim 1 to 4 any one automatically detect and adaptive EPON,The method of GPON, is characterized in that, steps A is further comprising the steps of: judge optical linkLOS signal do not eliminate, again detect the state of optical link.
ONU as described in claim 1 to 4 any one automatically detect and adaptive EPON,The method of GPON, is characterized in that, step B comprises current the connecing of following flow process: ONUWhen entering pattern and being GPON access module, media access control layer is descending 2488Mbps'sUnder GPON pattern, work, media access control layer, according to the technical standard of ITU-G.984, is transportedRow GPON frame is delimited state machine; When the current access module of ONU is EPON access module,Media access control layer is worked under the ethernet frame pattern of descending 1250Mbps, media accessKey-course is according to the technical standard of IEEE802.3ah, and operation EPON frame is delimited state machine.
ONU as described in claim 1 to 4 any one automatically detect and adaptive EPON,The method of GPON, is characterized in that, if the downlink optical signal that in step C, ONU receivesReach frame synchronization state, judgment frame is delimited state machine and the descending light that ONU receives detectedSignal reaches the frame synchronization state time used and whether exceedes 1000 milliseconds, if so, will arrangeDetection duration parameters be replaced by frame and delimit the descending light letter that state machine detects that ONU receivesNumber reach the detection duration parameters of frame synchronization state time used, otherwise by arrange detection timeLong parameter is replaced by 1000 milliseconds.
ONU as described in claim 1 to 4 any one automatically detect and adaptive EPON,The method of GPON, is characterized in that, changes the current access module bag of ONU in step DWhen drawing together the current access module of following flow process: ONU and being GPON access module, by GPONAccess module is replaced by EPON access module; The current access module of ONU is that EPON connectsWhile entering pattern, EPON access module is replaced by GPON access module.
9. the ONU based on described in claim 1 to 8 any one detects and adaptation automaticallyThe device of the method for EPON, GPON, is characterized in that, comprising:
Optical link signal judge module, for: electrifying startup ONU, reads and moves ONUCurrent access module parameter, access module parameter is GPON pattern or EPON pattern;The state that detects optical link, judges whether the LOS signal of optical link is eliminated, if so, ONUReceive the downlink optical signal of OLT, delimit state machine operation module to frame and send working signal;Otherwise again detect the state of optical link;
Frame is delimited state machine operation module, for: receive optical link signal judge module orAfter the working signal that person's access module handover module sends, the access module current according to ONUThe framing mode of media access control layer is set, transports according to the framing mode of media access control layerRow frame is delimited state machine; Send working signal to access module detection module;
Access module detection module, for: receive frame and delimit that state machine operation module sendsAfter working signal, arrange and read detection duration parameters, according to detecting duration parameters, detection is setTime; Within detection time, the frame moving by media access control layer is delimited state machineDetect described downlink optical signal and whether reach frame synchronization state, if so, mark ONU is currentThe access module access module current with OLT consistent, to ONU standby module transmission workSignal, otherwise the current access module of the current access module of mark ONU and OLT is inconsistent,Send working signal to access module handover module;
Access module handover module, for: receive the work that access module detection module sendsAfter signal, record frame demarcation state machine and detect that the downlink optical signal that ONU receives reaches frameThe time that synchronous regime is used, the detection duration parameters of setting is replaced by the frame demarcation state that recordsMachine examination measure downlink optical signal that ONU receives reach the frame synchronization state time used timeLong parameter; Delimit state machine operation module to frame and send working signal;
ONU standby module, for: receive access module detection module or access moduleAfter the working signal that handover module sends, complete the detection of ONU with adaptive, ONU normally treatsMachine.
10. ONU as claimed in claim 9 detects and adaptive EPON, GPON automaticallyThe device of method, it is characterized in that,
Described optical link signal judge module comprises:
Access module setting unit, for: on ONU, setting in advance access module parameter isGPON pattern or EPON pattern;
Optical link signal is eliminated state detection unit, for:
Whether the LOS signal that judges optical link is eliminated in the process of ONU electrifying startup, ifBe, determine that the LOS signal of optical link is to eliminate in the process of ONU electrifying startup, readGet the access module parameter setting in advance, according to access module parameter, current the connecing of ONU is setEnter pattern, delimit state machine operation module to frame and send working signal; Otherwise definite optical linkLOS signal is to eliminate after plugging optical fiber or change optical fiber in the process of the normal work of ONU;Directly delimit state machine operation module to frame and send working signal;
Or whether the LOS signal that judges optical link plugs in the process of the normal work of ONUAfter optical fiber or replacing optical fiber, eliminate, if so, determine that the LOS signal of optical link is at ONUAfter plugging optical fiber in the process of normal work or changing optical fiber, eliminate, directly delimit state machine to frameOperation module sends working signal; Otherwise the LOS signal of determining optical link is to power at ONUIn the process starting, eliminate, read the access module parameter setting in advance, join according to access moduleNumber arranges the current access module of ONU, delimits state machine operation module transmission work letter to frameNumber;
Described access module detection module comprises:
Detect duration record cell, for: the downlink optical signal receiving as ONU reaches frameWhen synchronous regime, judgment frame is delimited state machine and is detected that the downlink optical signal that ONU receives reachesWhether exceed 1000 milliseconds to the frame synchronization state time used, if so, by the detection arrangingDuration parameters is replaced by frame demarcation state machine and detects that the downlink optical signal that ONU receives reachesThe detection duration parameters of frame synchronization state time used, otherwise by the detection duration parameters arrangingBe replaced by 1000 milliseconds;
Described access module handover module comprises:
Detect duration updating block, for: the access module parameter setting in advance is replaced byThe access module parameter that ONU is current, increases to 1.3 by the detection duration parameters setting in advanceDoubly.
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| CN104540046A (en) * | 2015-01-07 | 2015-04-22 | 上海市共进通信技术有限公司 | Method for achieving intelligent ONU double-light source adaptation based on optical network unit |
| CN105915558B (en) * | 2016-06-30 | 2019-06-04 | 瑞斯康达科技发展股份有限公司 | A kind of the passive optical network communication means and system of ONU mixed insertion |
| CN109428787B (en) * | 2017-09-05 | 2020-07-28 | 中国电信股份有限公司 | Method for identifying abnormity of optical line terminal and optical network unit |
| CN107547952B (en) * | 2017-09-22 | 2020-06-09 | 烽火通信科技股份有限公司 | Method and system for adapting 10G/10G symmetry and 10G/1G asymmetry of ONU |
| CN109698981A (en) * | 2017-10-23 | 2019-04-30 | 深圳市中兴微电子技术有限公司 | Configuration method, equipment and the storage medium of passive optical network |
| CN112672238A (en) * | 2020-12-28 | 2021-04-16 | 武汉长光科技有限公司 | Method for ONU to adaptively access PON |
| CN113923543A (en) * | 2021-09-28 | 2022-01-11 | 锐捷网络股份有限公司 | ONU (optical network Unit) self-adaptive switching method, ONU, equipment and storage medium |
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