CN101958752B - Method for transmitting uplink burst data in passive optical network system - Google Patents
Method for transmitting uplink burst data in passive optical network system Download PDFInfo
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Abstract
The invention relates to passive optical network technology, in particular to a method, a device and a system for transmitting uplink burst data in a passive optical network system. In the method, the stop of the uplink burst data is delimited, and an interface between a physical layer and upper layer application is not needed to be arranged. The method for transmitting the uplink burst data comprises the following steps of: starting a laser and transmitting a synchronous mode sequence and a burst delimiting symbol; transmitting data to be transmitted; transmitting a burst ending delimiting symbol after the transmission of the data to be transmitted is finished; and closing the laser. Meanwhile, the invention also provides a method and a related device and system for receiving the uplink burst data.
Description
Technical field
The present invention relates to passive optical network technique, particularly relate to the method for uplink burst data in EPON and device, system.
Background technology
EPON (Passive Optical Network, PON) becoming the outstanding person of light access technology due to advantages such as its easy care, high bandwidth, low costs, is the desirable physical platform that comprehensively accesses the multiple business such as voice, data, video by single platform.PON technology is the optical fiber access technology of point-to-multipoint (Point to Multipoint, P2MP).PON is by optical line terminal (Optical Line Terminal, OLT), optical network unit (Opitcal Network Unit, and Optical Distribution Network (Optical Distribution Network ONU), ODN) composition, its advantage derives from the divide/mixer of passive light (Splitter/Coupler) in ODN, thereby PON does not need to use the components and parts with amplification and relay function.Due to the topological structure of PON employing point-to-multipoint, so must adopt point-to-multipoint multiple access protocol to make numerous ONU can share OLT and trunk optical fiber.Classify from the content of carrying at present, PON can be divided into multiple, and wherein Ethernet passive optical network (Ethernet Passive Optical Network EPON) is comparatively to commonly use, and performance is preferably a kind of.
In PON system, arrange, the direction of data from OLT to ONU is down direction, and the direction from ONU to OLT is up direction.The up-downgoing transmission means of current widely used PON system at the broadcast mode of the descending employing time division multiplexing of PON (TDM) and the access way of up employing time division multiple access access (TDMA).The uplink of PON system is based on burst mode, is sent to OLT from the data of multiple ONU, and OLT need to delimit the data of each ONU under burst mode, thereby the data of each ONU receiving are distinguished.In existing technology because the sending time slots of each ONU is to be authorized by OLT, the MAC layer of OLT is known time started and the end time from the bursty data of each ONU, therefore the MAC layer of OLT can pass through to increase the interface of MAC layer and physical layer, and when the data from ONU of utilizing management data input and output (MDIO) registers (Register) to inform that OLT physical layer receives finish.When OLT physical layer is learnt after the end position of these data, start to start Burst Delimiter search, the data from next ONU that receive are below mated, after the match is successful, OLT is known the starting position of ONU data, thereby starts to receive the data of this ONU.But in existing technology, the upper layer application of MDIO register needs and OLT communicates, thereby need to increase the interface of MIDO register and OLT upper layer communication, described scheme had both changed the functional independence of MDIO, had changed again the interface of MAC layer and physical layer, implementation procedure more complicated.
Summary of the invention
The embodiment of the present invention provides a kind of method that sends uplink burst data in passive optical network system, in the method, realizes uplink burst data is finished to delimit.The method does not need to increase the interface between physical layer and upper layer application.
Described method is: after opening laser, insert synchronization model sequence and burst delimiter before data to be sent; Send described synchronization model sequence and burst delimiter; Read data to be sent; Send described data; Described data send and finish, and insert burst and finish delimiter; Send described burst and finish delimiter; Close laser.
Further the embodiment of the present invention also provides another to send the method for uplink burst data in passive optical network system, and the method is: after opening laser, insert synchronization model sequence and burst delimiter before data to be sent; Send described synchronization model sequence and burst delimiter; Read data to be sent; Send described data; Described data send and finish, and start and close laser; Start and close the full null sequence of binary system that sends a length-specific after laser.
The embodiment of the present invention also provides a kind of method that receives uplink burst data in passive optical network system simultaneously, and described method is:
Start and receive data; To happen suddenly delimiter coupling of the data that receive, the data that receive are mated with burst delimiter length; If the match is successful, then the end delimiter coupling that happens suddenly, if the match is successful, illustrate that bursty data receives end.
The embodiment of the present invention also provides a kind of optical network unit transmitting terminal device, and described device comprises:
Data detection module, for data to be sent are detected, in the time detecting that data to be sent arrive, indication laser is opened, and in the time detecting that data to be sent and burst finish delimiter transmission end, indication laser is closed; Sending module, for sending data, comprises upstream data burst; Synchronization model sequence insert module is inserted synchronization model sequence after opening laser; Burst delimiter insert module is inserted burst delimiter after opening laser; Data read module reads data to be sent from send buffering; Burst finishes delimiter insert module, for run through data to be sent at data read module, when bursty data finishes, inserts burst and finishes delimiter.
Another kind of optical network unit transmitting terminal device is further provided, and described device comprises:
Data detection module, for data to be sent are detected, in the time detecting that data to be sent arrive, indication laser is opened, and in the time ED to be sent being detected, indication laser is closed; Sending module, for sending data, comprises upstream data burst; Synchronization model sequence insert module is inserted synchronization model sequence after opening laser; Burst delimiter insert module is inserted burst delimiter after opening laser; Data read module reads data to be sent from send buffering; Appended sequence insert module, it for inserting the full null sequence of binary system of a length-specific after startup laser cuts out.
The present invention also provides a kind of optical line terminal receiving end device, and described device comprises:
Data reception module, receives and is shifted data; Burst delimiter matching module, for the happen suddenly coupling of delimiter of data that data reception module is obtained or the data that receive backward shift; Burst finishes delimiter matching module, happens suddenly and finishes the coupling of delimiter for the data of the reception to data reception module acquisition or reception backward shift.
Understandable, the present invention also provides a provenance optical network communication system, it is characterized in that, described system comprises; One optical network unit transmitting terminal and an optical line terminal receiving end device, described in
Optical network unit transmitting terminal comprises:
Data detection module, for data to be sent are detected, in the time detecting that data to be sent arrive, indication laser is opened, and in the time ED to be sent being detected, indication laser is closed; Sending module, for sending data, comprises upstream data burst; Synchronization model sequence insert module is inserted synchronization model sequence after opening laser; Burst delimiter insert module is inserted burst delimiter after opening laser; Data read module reads data to be sent from send buffering; Burst finishes delimiter insert module, for run through data to be sent at data read module, when bursty data finishes, inserts burst and finishes delimiter;
Described optical line terminal receiving terminal comprises:
Data reception module, receives and is shifted data; Burst delimiter matching module, for the happen suddenly coupling of delimiter of data that data reception module is obtained or the data that receive backward shift; Burst finishes delimiter matching module, happens suddenly and finishes the coupling of delimiter for the data of the reception to data reception module acquisition or reception backward shift.
The said method that the embodiment of the present invention provides and device are realized the demarcation to bursty data by add burst end delimiter after bursty data, receiving terminal is delimited bursty data by the coupling that the described burst increasing is finished to delimiter, this scheme does not need to increase the interface of physical layer and this part of upper layer application, do not need to change the functional independence of MDIO register, can simply realize the demarcation of bursty data in physical layer, and the complexity of this scheme is low.
Brief description of the drawings
Fig. 1 embodiment of the present invention upstream data burst structure chart;
Fig. 2 embodiment of the present invention ONU transmitting terminal burst transmit flow chart;
Fig. 3 embodiment of the present invention ONU transmitting terminal bursty data watch-dog fifo status variation diagram;
Fig. 4 embodiment of the present invention ONU transmitting terminal burst transmit state transition diagram
Fig. 5 embodiment of the present invention ONU sending end structure module map;
Fig. 6 embodiment of the present invention bursty data receives flow chart;
Fig. 7 embodiment of the present invention data burst receiving course matching process schematic diagram;
The state transition diagram that in Fig. 8 the present embodiment, the burst of OLT receiving terminal is delimited;
Fig. 9 embodiment of the present invention receiving terminal construction module figure.
Embodiment
The embodiment of the present invention describes in conjunction with EPON system, adds burst finish delimiter (EOB:End of Burst) by the end at each uplink burst data, realizes the demarcation that bursty data is finished.
Consult shown in Fig. 1; embodiment of the present invention upstream data burst structure; this upstream data burst structure is by synchronization model sequence (Sync Pattern; SP), burst delimiter (Burst Delimiter; BD), be subject to the data of FEC (Forward Error Correction, forward error correction) protection and burst to finish delimiter formation.Wherein Sync Pattern and Burst Delimiter are not subject to FEC coding protection, and Burst Delimiter is thereafter FEC code word, are subject to the data of FEC protection, and burst delimiter is not protected by FEC.Burst Delimiter is used for identifying the beginning (Start of Burst) that is subject to the data division of FEC protection in burst.The concrete form of EOB can be the Block (data block defining in 10G EPON, each data block is 66 bits) be unit, and the length of 2 Block of recommend adoption, its corresponding binary numeral can adopt 000000.... or 101010... or 010101... sequence, adopt complete zero binary sequence or 0,1 binary sequence replacing, totally 132 bits.
Consult Fig. 2, embodiment of the present invention ONU transmitting terminal bursty data transmission flow figure.
S201 detects whether there are data to be sent, if do not have data to be sent to continue to detect, when having detected that carrying out S202 after ethernet data frame to be sent opens laser;
S203 inserted and sent Sync Pattern and Burst Delimiter after opening laser before data to be sent, and in this example, Sync Pattern is 0x555..., and Burst Delimiter is 1 Block length, 66 bits;
S204, reads data to be sent;
S205, sends data;
S206, judges whether data send end, does not finish if data send, and continues to read data to be sent, finishes if data send, and carries out S207;
S207, insert EOB and send this EOB, the concrete form of EOB inserting can be with Block (data block, each data block is 66 bits) be unit, and the length of 2 Block of recommend adoption, its corresponding binary numeral can adopt 000000.... or 101010... or 010101... sequence, adopts complete zero binary sequence or 0,1 binary sequence replacing, totally 132 bits;
S208, closes laser after EOB is sent completely;
Laser switch is to be controlled by the concrete state of the First Input First Output (FIFO) in the data monitoring device of ONU transmitting terminal (Data Detector).
Consult Fig. 3, ONU transmitting terminal bursty data watch-dog fifo status variation diagram.When detecting data to be sent, the data detector of ONU transmitting terminal arrives; be fifo queue tail while there are to be sent data that are subject to FEC coding protection indication laser open; carry out S202; in the present embodiment; before data to be sent arrive, FIFO is controll block, and this controll block is IDLE (free time) command character in this example.Before data to be sent, inserting Sync Pattern (0x555...) and Burst Delimiter (is 1 Block length in 10GEPON, 66 bits) and send described Sync Pattern and Burst Delimiter, then send data to be sent.When total data is sent, the FIFO of data monitoring device is all filled by controll block, detects that FIFO is all filled and thinks that data are sent completely by controll block, now carries out S206, inserts and sends burst and finish delimiter EOB.After EOB is sent, indication laser is closed.Can be in the time that laser be closed in startup in concrete enforcement or startup the controll block in FIFO is set to complete zero Block entirely after closing laser.
Consult Fig. 4, ONU transmitting terminal burst transmit state transition diagram.ONU initial condition is laser closed condition " Laser_Is_Off ", whether Boolean variable data_start identifies data to be sent and arrives, in the time that the value of Boolean variable data_start is " false ", show not detect that data to be sent arrive, now laser will be always in closed condition; Value once Boolean variable data_start is " true ", shows that data to be sent arrive, and laser is opened in instruction, and state changes " On " into; Then enter successively and send Sync Pattern and Burst Delimiter state, i.e. state " Transmit_Sync_Pattern " and " Transmit_Burst_Delimiter "; After Sync Pattern and Burst Delimiter are sent, enter and send the data mode " FEC_Is_On " that is subject to FEC protection; In the time that the value of Boolean variable data_end is " false ", show that current bursty data is not yet sent, will send state " FEC_Is_On " in bursty data always; Once data are sent, when the value of Boolean variable data_end is " true ", enters EOB and send state " Transmit_EOB "; Then laser is closed in instruction, comes back to laser closed condition " Laser_Is_Off ", waits for that next new bursty data arrives, and so circulation, can send multiple continuous bursty datas to OLT successively.
Such scheme adds EOB by the end at each uplink burst data, realizes the demarcation that bursty data is finished.As expansion, in specific implementation process, can send rear startup laser in the data (being called again FEC data) that are subject to FEC protection and close, detect in fifo queue complete in starting and close laser after controll block.Need certain hour owing to closing laser, during this period of time, laser is still sending data, but according to the physical characteristic of laser, after indication laser is closed, laser transmitting power reduces gradually, until final plant closure.Therefore after closing laser, startup can insert again and send a full null sequence of binary system, this binary system complete zero does not become a part for bursty data, but immediately following after bursty data, so the full null sequence of this binary system can be used as the EOB of its last bursty data.The full null sequence of this binary system can be the natural number times length of 66 bits, recommends 132 bits.
Consult Fig. 5, ONU sending end structure module map.This ONU transmitting terminal 500 comprises:
Data detection module 501; for detection of whether there being data to be sent; in the time detecting that the to be sent data that are subject to FEC coding protection appear in fifo queue tail, think to need to be sent data to and reach; indication laser is opened; in the time detecting that ED to be sent and burst finish delimiter transmission end, indication laser is closed.
Sending module 502, for sending data, comprises upstream data burst.
Synchronization model sequence insert module 503, opens synchronization model sequence insert module after laser and inserts Sync Pattern, and after inserting, sending module 502 sends Sync Pattern.
Burst delimiter insert module 504, opens the delimiter insert module that happens suddenly after laser and inserts BurstDelimiter, and after inserting, sending module sends Burst Delimiter.
Data read module 505 reads data to be sent from send buffering, then sends by sending module 502.
Burst finishes delimiter insert module 506, and in the time that bursty data finishes, burst finishes delimiter insert module and inserts EOB, then sends by sending module 502.
After EOB is sent completely, close laser, burst finishes.
Further this ONU transmitting terminal also comprises command character modified module (not shown), and after being sent in data to be sent, laser cuts out and front controll block in FIFO is set to complete zero Block entirely.
The invention provides the embodiment of another ONU transmitting terminal, be with the difference of above-described embodiment:
Data detection module, it is for data to be sent are detected, and in the time detecting that data to be sent arrive, indication laser is opened, and in the time detecting that data to be sent send end, indication laser is closed;
Also comprise an appended sequence insert module (not shown), it for inserting the full null sequence of binary system of a length-specific after startup laser cuts out, and sending module 502 sends this binary sequence.
Foregoing description has been introduced the transmission of ONU transmitting terminal bursty data.
At OLT receiving terminal, bursty data is received and be processed.
Consult Fig. 6, embodiment of the present invention bursty data receives flow chart.
S600, starts OLT, carries out device initialize;
S601, data reception module starts reception data;
S602, to happen suddenly delimiter coupling of the data that receive, mates the data that receive with Burst Delimiter length (1 Block);
S603, judges whether success of coupling, calculates the Hamming distance HD (Hamming Distance) between data and the Burst Delimiter sequence receiving, and when HD is during lower than predefined thresholding T1, thinks that the match is successful;
If mate unsuccessfully, data reception module, by proceeding coupling (can also divide into groups to be shifted) after a bit of data displacements, receives new data simultaneously.If the match is successful, carry out S604
S604, is shifted to data; According to carrying out shifting function, by a bit of described data displacement, in concrete operation, also can skip the length that a FEC adds BD by bit log in this example, adopt bit or Block or other grouping displacement modes;
S605, carries out EOB coupling to the data after displacement taking 2 Block as unit;
S606, judges the whether success of EOB coupling, calculates the Hamming distance HD (Hamming Distance) receiving between data and EOB sequence, when HD is during lower than predefined thresholding T2, thinks that the match is successful; If mate unsuccessfully, by data displacements, mate for proceeding after single-place shift by Block (66 bit), receive new data simultaneously; If the match is successful in EOB search, show that current burst finishes, then carry out S601, continue the burst to the next one and receive, delimit.
Further complete the coupling that starts full null sequence to a regular length after burst delimiter, this matching process is called additional coupling, and this additional coupling can mate simultaneously and carry out with EOB, and adds and after the match is successful, think EOB the match is successful.Full null sequence herein can be the sequence with 1 block nature several times, the full null sequence of 2 block of recommendation.
Consult Fig. 7, embodiment of the present invention data burst receiving course matching process schematic diagram.Further illustrate the matching process in S603 and S606.Burst Delimiter mates with the data that receive, and calculates the Hamming distance HD (Hamming Distance) receiving between data and Burst Delimiter sequence, when HD is during lower than predefined thresholding T1, thinks that the match is successful; If mate unsuccessfully, carry out shifting function by bit, then mate, until till the match is successful.If the match is successful for Burst Delimiter, the original position of burst can be determined, now starts EOB coupling flow process; Due to the length of 2 Block of embodiment of the present invention recommendation EOB employing, and the match is successful for Burst Delimiter, can realize the synchronous of Block, therefore to recommend by Block (66 bit) be the unit coupling that is shifted to the coupling flow process technical solution of the present invention of EOB simultaneously; Calculate the Hamming distance HD (Hamming Distance) receiving between data and EOB sequence, when HD is during lower than predefined thresholding T2, think that the match is successful; If the match is successful for EOB, the end position of burst can be determined, now restarts Burst Delimiter coupling again, detects the original position of next burst, so repeatedly, the burst of each arrival OLT all can effectively be detected its starting and ending position.
Consult Fig. 8, the state transition diagram that in the present embodiment, the burst of OLT receiving terminal is delimited.First OLT receiving terminal enters initial condition " INIT ", respectively Boolean variable BD_lock and EOB_lock are initialized as to " false ", wherein BD_lock and EOB_lock identify respectively Burst Delimiter and EOB matching status, and the match is successful is " true ", otherwise is " false "; Start Burst Delimiter coupling, enter " TEST_BD " state; If mate unsuccessfully, enter " BIT SLIP " state, carry out data receiver or displacement, displacement mode is shifted for press bit displacement or grouping, then re-starts coupling; So circulation, until the match is successful (being that BD_lock_success state becomes true), is now set to " true " by variable BD_lock, starts EOB coupling, enters EOB matching status " TEST_EOB "; If mate unsuccessfully, enter " BLOCK SLIP " state, carry out data receiver or displacement, displacement mode is shifted or other displacement modes for press Block, then re-starts coupling; So circulation, until the match is successful (being that EOB_lock_success state becomes true), is now set to " true " by variable EOB_lock, and current burst is delimited and received; Enter " RESET " state, variable BD_lock and EOB_lock are set to " false " again, restart new round circulation, receive new bursty data to delimit, so circulation, can realize demarcation and reception to all bursty datas that receive.
In the concrete matching operation of EOB, can be shifted by block, as previously described.The present invention also provides other embodiment.Can adopt by bit displacement or also can be in the data of carrying out skipping before the EOB displacement coupling certain length matching operation that is shifted again.Such as the FEC code word size that can jump (in 10G EPON system, data division is at least a FEC code word size, and single FEC code word size is 31 Block).For the EOB definition that the match is successful, if the Hamming distance HD (Hamming Distance) of EOB and reception data meets following requirement: in the time that EOB adopts 000000... to be concrete numerical value, it is complete zero binary sequence of numerical value, if HD < is T2, think that the match is successful; In the time that EOB adopts 010101... or 101010... to be concrete numerical value, be that numerical value is 0,1 staggered binary sequence, also think that the match is successful if allow 010101... (taking 01 as 0,1 of circulation staggered binary sequence) to match 101010... (taking 10 as 0,1 of circulation staggered binary sequence), in the time of HD > 132-T2 or HD < T2, think that the match is successful, otherwise as HD < T2, think that the match is successful, wherein T2 is tolerance thresholding.
Burst in the embodiment of the present invention finishes length and the concrete numerical value of delimiter and can set according to the actual conditions of system or device, the length that the burst that the embodiment of the present invention is recommended finishes delimiter is 2 block, and concrete numerical value is that the complete zero binary sequence 000000... of numerical value or numerical value are 0,1 staggered binary sequence (010101... or 101010...);
Be 0 when EOB adopts numerical value, when 1 staggered binary sequence 010101... or 101010... are concrete numerical value, once EOB causes correctly matching because transmission produces error code, now because the concrete form of the Sync Pattern of next one burst is also 10101010..., so Secondary Match protection can be provided, but may there is the situation that bit misplaces owing to adopting the displacement mode of Block to cause, when making of 010101... while mating, time 101010... in possible correspondence, as long as be HD > 132-T2 or HD < T2 mode decision scheme but take Hamming distance thresholding, equally can the match is successful, thereby finish previous burst before new burst Burst Delimiter coupling, start in time Burst Delimiter coupling.
And in the time that EOB adopts the binary sequence 000000... of numerical value complete zero to be concrete numerical value; owing to there is no transfer of data between burst; what on channel, embody is exactly full remainder certificate; in like manner; in the time that EOB causes correctly matching because transmission produces error code, can utilize the full remainder certificate between burst that Secondary Match protection is provided.If exist the full remainder between burst cannot realize Secondary Match according to may also not reaching the length of EOB, now can utilize the Sync Pattern of next burst, except 00000..., once match 010101... or 101010... in Sync Pattern, also can think that the match is successful.Owing to having adopted the binary sequence 000000... of numerical value complete zero as the concrete numerical value of EOB, the PMD that is also conducive to ONU transmitting terminal simultaneously enters closed condition quickly.
Consult Fig. 9, embodiment of the present invention receiving terminal construction module figure.This OLT receiving terminal 900 comprises that data reception module 901, burst delimiter matching module 902 and burst finish delimiter matching module 903.Data reception module 901 receives data and is shifted.In the time that OLT starts, carry out device initialize, data reception module 901 starts reception data, and output switch is closed to burst delimiter matching module 902, the data that receive are sent into the delimiter matching module 902 that the happens suddenly delimiter simultaneously match that happens suddenly taking Burst Delimiter length (1 Block) as unit; Submodule first computing module of burst delimiter matching module 902 calculates the Hamming distance HD (Hamming Distance) receiving between data and Burst Delimiter sequence, when HD is during lower than predefined thresholding T, thinks that the match is successful; If mate unsuccessfully, data reception module 901 is proceeded coupling (can also divide into groups to be shifted) by sending into burst delimiter matching module 902 after a bit of data displacements, receives new data simultaneously, and can cycling.The match is successful for Burst Delimiter, shows successfully synchronously to receive the bursty data sending over from certain ONU, and now switch is closed into burst end delimiter matching module 903, starts EOB search coupling; Now data reception module 901 is sent into taking EOB length (2 Block) as unit the data that receive burst and is finished delimiter matching module 902 and carry out EOB matching operation; Submodule the second computing module that burst finishes delimiter matching module 902 calculates the Hamming distance HD (Hamming Distance) receiving between data and EOB sequence, when HD is during lower than predefined thresholding T, thinks that the match is successful; If mate unsuccessfully, data reception module 901 is proceeded coupling by data by sending into EOB matching module after Block (66 bit) displacement, receives new data, operation capable of circulation simultaneously.The match is successful in EOB search, shows that burst finishes, and data reception module 901 is closed to output switch burst delimiter matching module 902 again.Meanwhile, described OLT receiving terminal 900 also comprises an appended sequence matching module (not shown), the coupling to a full null sequence with 66 bit natural number times length after burst delimiter matching module 902 is successfully to burst delimiter coupling.
Pass through foregoing description, the Burst Delimiter that can start next burst after data reception module 901 is closed to output switch burst delimiter matching module 902 again synchronously searches for, and can realize synchronous reception and demarcation to each bursty data sending from ONU.
Above-mentioned to receiving terminal to EOB being mated in the reception of bursty data, in actual enforcement, whether bring in itself and nonrecognition EOB for reception is that transmitting terminal inserts in bursty data, but from receiving terminal, the coupling of EOB is thought to the coupling to particular sequence, this particular sequence can be 0,1 binary sequence replacing (010101... or 101010...) for binary numeral can adopt the binary sequence 000000...... of numerical value complete zero or numerical value, recommends 132 bits.EOB is only that burst finishes delimiter to receiving terminal.Owing to there being interval in adjacent bursts, what on channel, embody is exactly full remainder certificate, and data sequence therebetween still can be used as burst to receiving terminal and finishes identifier.Not being defined as at receiving terminal EOB the data that transmitting terminal inserts, should thinking a particular sequence, can be that transmitting terminal inserts in bursty data, can also be the data between adjacent bursts, can be the combination of above-mentioned two kinds of data equally.In addition, finish identifier for burst, in force, can be the data inserted in previous burst with burst between in data and a rear burst between the combination of Sync Pattern or burst data and rear happen suddenly in the combination of Sync Pattern.So can think that what can be used as bursty data EOB in concrete enforcement is not only the data of inserting in burst, it can also be above-mentioned several situation.In the time receiving, the coupling of EOB should be the coupling to particular data sequence.
The said method that the embodiment of the present invention provides and device are realized the demarcation to bursty data by add burst end delimiter after bursty data, receiving terminal is delimited bursty data by the coupling that the described burst increasing is finished to delimiter, this scheme does not need to increase the interface of physical layer and this part of upper layer application, do not need to change the functional independence of MDIO register, can simply realize the demarcation of bursty data in physical layer, and the complexity of this scheme is low.
Claims (7)
1. a method that sends uplink burst data in passive optical network system, is characterized in that, described method comprises:
Open laser;
Insert and send synchronization model sequence and burst delimiter;
Read data to be sent;
Send described data to be sent;
Described data to be sent send and finish to insert and sends the end delimiter that happens suddenly, described burst finish delimiter be taking 66 bits as unit 0,1 staggered binary sequence;
Close laser;
The opening and closing by the concrete state control of the First Input First Output FIFO in data monitoring device Data Detector of described laser.
2. the method for claim 1, is characterized in that, when detecting that inserting and send described burst after the First Input First Output of data monitoring device is all filled by controll block finishes delimiter.
3. the method for claim 1, is characterized in that, described method also further comprises:
In the time that laser is closed in startup or startup the controll block in the First Input First Output of data monitoring device is set to full zero data blocks after closing laser.
4. the method for claim 1, is characterized in that, described method also comprises:
Judge whether described data send end, do not finish if described data send, continue to read described data to be sent;
Finish if described data send, insert and send described burst and finish delimiter.
5. a method that sends uplink burst data in passive optical network system, is characterized in that, described method comprises:
After opening laser, before data to be sent, insert and send synchronization model sequence Sync Pattern and burst delimiter Burst Delimiter;
Read described data to be sent;
Send described data;
Judge whether described data send end, do not finish if described data send, continue to read described data to be sent;
Finish if described data send, insert and send burst and finish delimiter End of Burst, it is 0, the 1 staggered binary sequence taking 66 bits as unit that described burst finishes delimiter;
Described burst finishes after delimiter is sent completely to close laser.
6. method as claimed in claim 5, it is characterized in that detect whether there are described data to be sent, if do not have described data to be sent to continue to detect, open laser when having detected after described data to be sent, wherein said data to be sent are Ethernet data to be sent.
7. method as claimed in claim 5, is characterized in that, when detecting that inserting and send described burst after the First Input First Output of data monitoring device is all filled by controll block finishes delimiter.
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| WO2018165893A1 (en) * | 2017-03-15 | 2018-09-20 | 华为技术有限公司 | Method for sending optical signal by optical network unit, and optical network unit |
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