CN101795174A - Data transmission method, device and system in 10G EPON (Ethernet-based Passive Optical Network) - Google Patents
Data transmission method, device and system in 10G EPON (Ethernet-based Passive Optical Network) Download PDFInfo
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Abstract
The invention provides data transmission method, device and system in a 10G EPON. The data transmission method of a downstream link in the 10G EPON comprises the following steps of: judging whether forward error correction (FEC) encoding is carried out on downstream data or not by using an optical line terminal (OLT) according to preset identification information; if so, adopting a 10G EPON protocol comprising the FEC encoding to encode the downstream data, and otherwise, adopting a 10GE protocol to encode the downstream data; and outputting the encoded downstream data to an ONU (Optical Network Unit) through the downstream link to enable the ONU to synchronize the downstream data, and decoding the synchronized downstream data according to a synchronization result. The invention enables the FEC encoding on the data to become a selectable processing process through increasing the auxiliary link of non-FEC encoding, thereby improving the effective bandwidth when the FEC encoding on the data is carried out and satisfying the demands of customers.
Description
Technical field
The present invention relates to network communications technology field, relate in particular to data transmission method, Apparatus and system in a kind of 10G EPON system.
Background technology
EPON (Ethernet Passive Optical Network, Ethernet passive optical network) is a kind of novel Optical Access Network technology, and it adopts point to multipoint configuration, passive fiber transmission, and multiple business is provided on Ethernet.It has adopted the PON technology in physical layer, uses Ethernet protocol at link layer, utilizes the topological structure of PON to realize the access of Ethernet.Therefore, it combines the advantage of PON technology and ethernet technology: low cost, high bandwidth, autgmentability are strong, service reorganization fast flexibly, with the compatibility of existing Ethernet, management easily etc.The PON network is upgraded to 10Gbps from existing 1Gbps, as the most competitive technology among the PON of future generation, 10G EPON technology is brought up to a new class to the network insertion bandwidth again, the 10G-EPON technology provides bigger bandwidth, more user to insert selection, meets the development trend of carrier network IPization, broadband and flattening.
At present, 10G EPON international standard (IEEE 802.3av-2009) adopts RS (255,223,16) code as uplink and downlink FEC (Forward Error Correction, forward error correction) coding, and adopt fixing FEC codeword form to carry out the up-downgoing transmission.10G EPON international standard mandatory requirement FEC function enables always, promptly in the downlink transfer link, OLT (Optical Line Termination, optical line terminal) must carry out the back output of FEC coding to the data of the RS sublayer that receives, ONU (OpticalNetwork Unit, optical network unit) data that receive is exported behind fec decoder, in the uplink link, ONU carries out the back output of FEC coding to the data of the RS sublayer of reception, OLT exports behind fec decoder the data that receive, wherein, downlink transfer is promptly transmitted the process of data to all ONU distributions of its subordinate by TDM (Time DivisionMultiplexing, time division multiplexing) mode by OLT; The time slot that uplink is promptly given according to the OLT under it by ONU is uploaded the process of data to OLT.
But, the FEC code efficiency is 87%, that is to say, though PON optical fiber link data bandwidth is 10Gbps, but actual available bandwidth (effective bandwidth) has only 8.7Gbps, therefore, though FEC coding can increase the optical power budget of system, this system can't provide bigger effective bandwidth (as greater than 8.7Gbps) to satisfy client's demand.
Summary of the invention
The embodiment of the invention provides data transmission method, the Apparatus and system in a kind of 10G EPON system, can improve the effective bandwidth of system.
In order to solve the problems of the technologies described above, the technical scheme of the embodiment of the invention is as follows:
The embodiment of the invention provides the data transmission method of down link in a kind of 10G Ethernet passive optical network EPON system, comprising:
Whether optical line terminal OLT carries out forward error correction FEC coding to downlink data according to the identification information judgment that presets; If yes, then adopt the 10G EPON agreement that comprises the FEC coding that described downlink data is encoded; Otherwise, adopt the 10GE agreement that described downlink data is encoded;
Export the downlink data behind the coding to ONU by down link,, and, the downlink data after synchronous is decoded according to synchronized result so that ONU carries out synchronously downlink data.
The embodiment of the invention also provides the data transmission method of down link in a kind of 10G Ethernet passive optical network EPON system, comprising:
Optical network unit ONU receives the downlink data from optical line terminal OLT;
Described ONU carries out Synchronous Processing to described downlink data;
When judging that according to the result of Synchronous Processing downlink data does not carry out forward error correction FEC coding, adopt the 10GE agreement that the data after are synchronously decoded;
When judging that according to the result of Synchronous Processing downlink data has the forward error correction of carrying out FEC coding, adopt the 10G EPON agreement that comprises fec decoder that the data after are synchronously decoded.
The embodiment of the invention also provides a kind of optical line terminal OLT, comprises data transmit-receive module, and described data transmit-receive module comprises:
First coding pass is used to adopt the 10G Ethernet passive optical network EPON agreement that comprises forward error correction FEC coding that downlink data is encoded;
Second coding pass is used to adopt 10G Ethernet E agreement that downlink data is encoded;
The FEC control module is used for whether downlink data being carried out the FEC coding according to default identification information judgment, if for being then with described first coding pass described downlink data to be encoded; Otherwise, described downlink data is encoded with described second coding pass;
Send data and select module, be used for the downlink data behind described first coding pass or described second coding pass coding is sent to down link.
The embodiment of the invention also provides a kind of 10G Ethernet passive optical network EPON system, comprises optical line terminal OLT and optical network unit,
Described OLT, being used for the default identification information of basis judges when needs carry out forward error correction FEC coding to downlink data, employing comprises that the 10G EPON agreement of FEC coding encodes to downlink data, otherwise, adopt the 10GE agreement that downlink data is encoded, the downlink data behind the coding is sent to ONU;
Described ONU, be used for the downlink data from OLT is carried out Synchronous Processing, result according to Synchronous Processing judges whether downlink data has carried out the FEC coding, if yes, then adopt and comprise that the 10G EPON agreement of fec decoder decodes to downlink data, otherwise, adopt the 10GE agreement that downlink data is decoded.
The embodiment of the invention is by increasing the secondary link of non-FEC coding in data transmission link, make data are carried out the FEC coding to become selectable processing procedure, thereby when data not being carried out the FEC coding, improved effective bandwidth, satisfied client's demand.
Description of drawings
Fig. 1 is the schematic diagram of the frame structure of existing EPON;
Fig. 2 is the schematic diagram of the frame structure of existing 10G EPON;
Fig. 3 A is existing 10G EPON down link structure schematic diagram;
Fig. 3 B is the schematic diagram of the structure of the 10G EPON down link that provides of the embodiment of the invention;
Fig. 4 A is existing 10G EPON uplink structure schematic diagram;
Fig. 4 B is the schematic diagram of the structure of the 10G EPON up link that provides of the embodiment of the invention;
Fig. 5 is the schematic diagram of the frame structure of 10G EPON agreement and 10GE agreement;
Fig. 6 is the data transmission method flow chart of the up link that provides of the embodiment of the invention;
Fig. 7 is the data transmission method flow chart of the down link that provides of one embodiment of the invention;
Fig. 8 is the data transmission method flow chart of the down link that provides of one embodiment of the invention;
The schematic diagram of the structure of data transmit-receive module among the OLT that Fig. 9 provides for the embodiment of the invention;
The schematic diagram of the structure of the data transmit-receive module among the ONU that Figure 10 provides for the embodiment of the invention.
Embodiment
In order to make those skilled in the art can further understand feature of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, accompanying drawing only provide with reference to and explanation, be not to be used for limiting the present invention.
Fig. 1 is the schematic diagram of the data transmission format of existing EPON, as can be seen from the figure, in the EPON transmission course, data are divided into the continuous information stream of regular length, for having carried out FEC information encoded stream, only need add the sign position at the frame head place of information flow, receiving terminal can judge whether the fix information stream of back, sign position has carried out the FEC coding by discerning this sign position, therefore, in existing EPON, the FEC coding is optional.(RS (255 and 10G EPON adopts fixing FEC coded system, 223) code) and FEC codeword form (27 66bit Payload+4 66bitParity=31 66bit Codeword) carry out the up-downgoing transfer of data, in other words, the FEC coding of 10G EPON is a fixed enable, can't close,, also can produce 4 bytes " 0 " even data do not need to carry out the FEC coding, this is different with existing EPON, and Fig. 2 is the schematic diagram of the data transmission format of 10G EPON.So 10G EPON up-downgoing transfer of data has fixing FEC coding expense (FEC overhead), be about 13% (4/31=0.129), circuit effective bandwidth (available bandwidth in other words) 8.7Gbps that only has an appointment, rather than theoretic 10Gbps, in order to save this expense, one embodiment of the invention provides a kind of 10G EPON system, the system that is provided comprises local side apparatus and terminal equipment, and in the present embodiment, local side apparatus and terminal equipment are expanded, relate generally to the data transmit-receive module of local side apparatus and terminal equipment, below will be as an example with OLT that is positioned at local side and the ONU that is positioned at far-end.
Down direction, OLT sends data to ONU, and 10G EPON protocol code passage (first coding pass) and 10GE protocol code passage (second coding pass) are set in the sending module of OLT.First coding pass adopts 10G EPON agreement that data are handled, and need carry out the FEC coding to data; Second coding pass adopts the 10GE agreement that data are handled, and can not need data are carried out the FEC coding.
Whether needs carry out the FEC coding to downlink data to OLT according to the identification information judgment that sets in advance, if do not need, then adopt second coding pass that downlink data is handled; Otherwise, adopt first coding pass that downlink data is handled.
Wherein, second coding pass specifically can comprise 64B/66B coding and scrambler functional modules such as (Scramble).First coding pass specifically can comprise functional modules such as Idle deletion (Idle Deletion), 64B/66B coding, scrambler and FEC coding.
Further, up direction also is provided with 10G EPON protocol-decoding passage (second decoding channels) and 10GE protocol-decoding passage (second decoding channels) among the OLT.First decoding channels adopts the 10GEPON agreement that upstream data is handled, and need carry out fec decoder to upstream data; Second decoding channels adopts the 10GE agreement that upstream data is handled, and can not need upstream data is carried out fec decoder.
OLT receives the upstream data from ONU, judges according to the result of burst synchronization whether upstream data has carried out the FEC coding, if do not have, then adopts second decoding channels that upstream data is handled; Otherwise, adopt first decoding channels that upstream data is handled.
Wherein, second decoding channels specifically can comprise functional modules such as descrambling code (Descramble) and 64B/66B decoding; First decoding channels can comprise that specifically fec decoder, descrambling code, 64B/66B decoding and Idle insert functional modules such as (Idle Insertion).
To specifically come present embodiment is described in detail below from descending and up both direction.
(1) down direction:
At present, the sublayer structure of the data transmission blocks of OLT and the data reception module of ONU as shown in Figure 3A, comprise respectively: RS (Reconciliation sublayer, Reconciliation Sublayer) sublayer, PCS (PhysicalCoding Sublayer Physical Coding Sublayer) sublayer, PMD (Physical Medium Dependent, physical medium is relevant) sublayer and PMD (Physical Medium Attachment, physical medium is additional) sublayer.Wherein, the PCS sublayer of OLT comprises Idle deletion, 64B/66B coding, scrambler, FEC coding and gearbox functional modules such as (Gearbox).The then corresponding functional modules such as gearbox, synchronous motor (Synchronizer), fec decoder, descrambling code, 64B/66B decoding and Idle insertion that comprise in the PCS sublayer of ONU.
The embodiment of the invention increases 10GE protocol code passage, i.e. second coding pass in the PCS sublayer of the data transmission blocks of OLT.Shown in Fig. 3 B.Like this, in the data transmission blocks of OLT, just comprise first coding pass and the second coding pass two passes, first coding pass comprises Idle deletion, 64B/66B coding and FEC coding etc., adopts 10G EPON agreement predetermined process mode that data are handled.Second coding pass comprises 64B/66B coding and scrambler etc., adopts 10GE (10GigabitEthernet, ten thousand mbit ethernets) agreement that data are handled, and the 10GE agreement can be 10GBASE-R or 10GBASE-X etc.
In order between two passages, to control, in the data transmission blocks of OLT, also to increase FEC control module and data and send the selection module.The FEC control module is provided with switch, and this switch can connect first coding pass or second coding pass.The FEC control module is used for splitting the pass according to the value of register and controls, when control switch is connected to first coding pass, transmission data selection module is sent the data from first coding pass, when control switch was connected to second coding pass, transmission data selection module was sent the data from second coding pass.
Accordingly, in the PCS sublayer of the data reception module of ONU, increase 10GE protocol-decoding passage, like this, also comprise 10G EPON protocol-decoding passage (the 3rd decoding channels) and two passages of 10GE protocol-decoding passage (the 4th decoding channels) in the data reception module of ONU, wherein, the 3rd decoding channels comprise FEC synchronously, functional modules such as fec decoder, descrambling code, 64B/66B decoding and Idle insertions, employing 10G EPON agreement predetermined process mode is handled data; The 4th decoding channels comprise non-FEC synchronously, functional modules such as descrambling code and 64B/66B decoding, employing 10GE agreement is handled data.
In order to control, in the data reception module of ONU, also to be provided with the FEC control module and to receive data and select module two passages of ONU.The FEC control module is provided with switch, and synchronized result (" success synchronously ", " the synchronization failure ") control switch that is used for according to FEC synchronization module or non-FEC synchronization module is connected to the 3rd decoding channels or the 4th decoding channels.Concrete, when the synchronized result of FEC synchronization module was " success synchronously ", control switch was communicated with the 3rd decoding channels; When the synchronized result of non-FEC synchronization module was " success synchronously ", control switch was communicated with the 4th decoding channels.Receiving data selects module to be used for the data of the 3rd decoding channels or the 4th decoding channels are sent to the RS sublayer.
(2) up direction:
At present, the sublayer structure of the data transmission blocks of the data reception module of OLT and ONU is shown in Fig. 4 A.
The embodiment of the invention is expanded the PCS sublayer of the data transmission blocks of the data reception module of OLT and ONU, shown in Fig. 4 B, in the data transmission blocks of ONU, increase 10GE protocol code passage (the 4th coding pass), comprise 64B/66B coding and scrambler, adopt the 10GE agreement that upstream data is handled.Modules such as existing Idle deletion, 64B/66B coding, scrambler and FEC coding adopt 10G EPON agreement predetermined process mode that data are handled as 10G EPON protocol code passage (the 3rd coding pass).
Also be provided with data detection module, FEC control module in the data transmission blocks of ONU and send data and select module.The FEC control module is provided with switch, can determine that switch is to be communicated with the 3rd coding pass or the 4th coding pass according to the value of register.Sending data selects module can send FEC coded data or non-FEC coded data.Data detection module can add the first burst delimiter for the FEC coded data according to the configuration of FEC control module, add the second burst delimiter perhaps for non-FEC coded data, the first burst delimiter is used to indicate that data have carried out the FEC coding, and the second burst delimiter is used to indicate that data do not carry out the FEC coding.
Data reception module for OLT, the embodiment of the invention is expanded the PCS sublayer, comprise 10G EPON protocol-decoding passage (first decoding channels) and 10GE protocol-decoding passage (second decoding channels), first decoding channels comprises functional modules such as fec decoder, descrambling code, 64B/66B decoding and Idle insertion.Second decoding channels comprises descrambling code and 64B/66B decoding.Selection for first decoding channels and second decoding channels is to control by the FEC control module that is provided with.Between gearbox and two passages, also be provided with the burst synchronization module, be used for upstream data is carried out Synchronous Processing, the result and the delimiter type (" FEC Burst Delimiter " or " unFEC BurstDelimiter ") of output Synchronous Processing are according to the switch of delimiter type control FEC control module.
The frame structure of the data that 10GE agreement in the present embodiment and 10G EPON agreement are transmitted as shown in Figure 5, the 10GE agreement can be according to the value decision data of register when needs do not carry out the FEC coding, the data of back to reach, rather than are filled in " 0 ", can save the coding expense like this.
The embodiment of the invention in existing 10G EPON system, increase need not data are carried out FEC coding, decoding on/descending secondary link, solved in the prior art owing to the transmission data are carried out the effective bandwidth problem of smaller that the FEC coding produces, thereby improved the effective bandwidth of system, satisfied client's demand.
Embodiment of the embodiment of the invention provides the data transmission method and the system of Uplink/Downlink in a kind of 10G EPON system, by in Uplink/Downlink, increasing the secondary link of non-FEC coding, make and data are carried out FEC coding become selectable processing procedure, thereby when data not being carried out the FEC coding, improved effective bandwidth.Below in conjunction with drawings and Examples, technical scheme of the present invention is described.
With reference to Fig. 6, be the data transmission method flow chart of up link in a kind of 10G EPON of embodiment of the invention system.
This method can comprise:
In this step, the identification information that presets can be that OLT is handed down to the order of ONU or the built-in information of ONU, the FEC switch register for example is set, if the register set is then represented the data of exporting and need be carried out the FEC coding, if reset then need not data are carried out the FEC coding, the PCS layer of ONU achieves a butt joint by the identification to identification information and receives the judgement whether data need to carry out the FEC coding.This implementation method has multiple, repeats no more herein.
If judged result does not promptly need data are carried out the FEC coding for not yet in this step, then adopt the 10GE agreement that these data are handled, then change step 211～213 over to; If judged result also promptly needs data are carried out the FEC coding for being in this step, adopt 10G EPON agreement that data are handled, then change step 221～225 over to.
Step 211 is carried out the 64B/66B coding to data.
Promptly data are carried out the coding of 64bit to 66bit in this step, to insert synchronous head (Sync Head) and control character.The detailed process of this step is same as the prior art, repeats no more herein.Change step 212 then over to.
Step 212 is carried out scrambler (Scramble) to data and is handled.
Scramble carries out scrambler to the data of input in this step, and purpose is to produce 0-1 as much as possible or 1-0 saltus step, prevents that continuous " 0 " or continuous " 1 " from occurring, so that the receiving function that makes opposite end recovered clock and receive data better.The detailed process of this step is same as the prior art, repeats no more herein.Change step 213 then over to.
Step 213 is inserted the second burst delimiter at the data front end.
The second burst delimiter shows that data do not carry out FEC coding, in this step, for the burst delimiter that does not insert through the FEC coded data is 10 0x94,07 27 ED, 27 A7 1B 54, sending the position preface is: 10 0,010 1,001 1,110 0,000 1,110 0,100 1,011 0,111 1,110 0,100 1,110 0,101 1,101 10,000,010 1010, certainly this delimiter also can use the data of other types, only is an instantiation herein.Change step 23 over to.
Step 221 is carried out bell idles deletion (Idle Deletion) to data.
Idle Deletion is pre-seting of FEC coding, belong to the first step that realizes in the FEC coding step, because the FEC coding need insert FEC check digit (FEC Parity) in the valid data back, Idle Deletion is exactly in order to reserve such verification bit position in data flow.The detailed process of this step is same as the prior art, repeats no more herein.Change step 222 over to.
Step 222 is carried out the 64B/66B coding to data.
This step is similar with step 211, repeats no more herein.Change step 223 then over to.
Step 223 is carried out scrambler to data and is handled.
This step is similar with step 212, repeats no more herein.Change step 224 then over to.
Step 224 is carried out the FEC coding to data.
Cataloged procedure concrete in this step is same as the prior art, repeats no more herein.Change step 225 then over to.
Step 225 is inserted the first burst delimiter at the data front end.
In this step first burst delimiter can use the burst delimiter of standard: 01 0x6B F8 D812 D8,58 E4 AB, a transmission position preface is: 01 1,101 0,110 0,001 1,111 0,001 1,011 0,100 10,000,001 1,011 0,001 1,010 0,010 0,111 1,101 0101.The detailed process of this step is same as the prior art, repeats no more herein.Be sent to OLT then, change step 23 over to.
In this step, after OLT receives data, can discern data by the PCS layer, if the burst delimiter of data is non-FEC coding burst delimiter, illustrate that then data that OLT receives through the FEC coding, then change step 241 over to, if the burst delimiter is a FEC coding burst delimiter, the data that the OLT reception then is described have been passed through the FEC coding, then change step 251～253 over to.
Step 241 is carried out descrambling code (Descramble) and 64B/66B decoding (64B/66Bdecode) to data.
This process is and step 211,212 relative decode procedures that the detailed process of this step is same as the prior art, repeats no more herein.Change step 26 then over to.
Step 251 is carried out fec decoder to data.
The detailed process of this decoding is same as the prior art, repeats no more herein.Change step 252 then over to.
Step 252 is carried out descrambling code and 64B/66B decoding to data.
This process and step 241 are similar, and the detailed process of this step is same as the prior art, repeats no more herein.Change step 253 then over to.
Step 253 is carried out bell idles to data and is inserted (Idle Insertion).
Idle Insertion is just in time opposite with Idle Deletion to the processing procedure of data.Idle Insertion is in order to cooperate the fec decoder function, and the follow-up setting for fec decoder can belong to the subsequent step in the fec decoder step.The detailed process of this step is same as the prior art, repeats no more herein.Change step 26 then over to.
The embodiment of the invention is by need not data are carried out the up secondary link of FEC coding in the increase of ONU side, realize identification and processing by identification in the OLT side delimiter without the FEC coded data, improved the effective bandwidth of system, for example can be increased to greater than 8.7Gbps, even can bring up to 10Gbps, satisfied the demand of client, can use and the specific occasion that enough need not to increase for optical power budget for high bandwidth.
This up link is Burst mode (burst mode), and this is that up direction is peculiar, and burst is based on ONU's, so can be at the different different up FEC on/off of ONU configuration.
With reference to Fig. 7, be the data transmission method flow chart of down link in a kind of 10G EPON of embodiment of the invention system.
This method can comprise:
In this step, the identification information that presets can be built-in by the CPU of OLT side, the FEC switch register for example is set, if the register set is then represented the data of exporting and need be carried out the FEC coding, if reset then need not data are carried out the FEC coding, the PCS layer of OLT realizes whether data being needed to carry out the judgement of FEC coding by the identification to this identification information.This implementation method has multiple, repeats no more herein.
Step 703 if yes, then uses 10G EPON agreement that data are encoded.
Step 705 if not, is then encoded to data with the 10GE agreement.
If in previous step is rapid, judge data be need not to carry out the FEC coding, then in this step, adopt the 10GE agreement that data are handled, comprise existing 64B/66B coding and scramble, wherein the 64B/66B coding is the coding of 64bit to 66bit, to insert synchronous head (Sync Head) and control character; Scramble carries out scrambler to the data of input, and purpose is to produce 0-1 as much as possible or 1-0 saltus step, prevents that continuous " 0 " or continuous " 1 " from occurring, so that the receiving function that makes opposite end recovered clock and receive data better.
Step 707 exports the downlink data behind the coding to ONU, so that ONU is according to the synchronized result in the synchronous state machine, and according to synchronized result, the downlink data is synchronously decoded.
In this step, after OLT exports data to ONU, can judge that according to the synchronized result of two synchronous state machines whether the data of reception are through the FEC coding by the PCS layer of ONU.Concrete, the data that ONU receives can be passed to FEC Sync module and unFEC Sync module simultaneously, FEC Sync module and unFEC Sync module are carried out Synchronous Processing simultaneously to receiving data, inside modules all has a synchronous state machine, capital synchronous regime of output shows that receiving data is " success synchronously " (Sync OK) or " synchronization failure " (Sync Fail) on this state machine, select to carry out the flow process that the fec decoder flow process still need not to carry out fec decoder according to two synchronous regimes then to receiving data, if FEC Sync module output " success synchronously " (Sync OK), just select the fec decoder flow process, if unFEC Sync module output " success synchronously " (Sync OK), just select not carry out the flow process of fec decoder, the decoded data of this flow process is handled can be for handling corresponding 64B/66B decoding and descrambling code process with aforementioned coded data.Wherein, synchronous state machine is a prior art to receiving data synchronization and jump procedure, repeats no more herein.
The embodiment of the invention in existing 10G EPON system by need not data are carried out the descending secondary link of FEC coding in the increase of OLT side, judge receiving the data synchronization result in the ONU side, realization is to identification and processing without the FEC coded data, solved in the prior art owing to the transmission data are carried out the effective bandwidth problem of smaller that the FEC coding produces, thereby improved the effective bandwidth of system, satisfied client's demand.
Be elaborated below by the data transmission method of specific embodiment to down link in the 10G EPON system.With reference to Fig. 8, be the method flow diagram of the embodiment of the invention two.
This method can comprise:
This deterministic process and abovementioned steps 301 are similar, repeat no more herein.If judged result does not promptly need data are carried out the FEC coding for not yet in this step, adopt the 10GE agreement that data are handled, then change step 411～412 over to; If judged result also promptly needs data are carried out the FEC coding for being in this step, adopt 10G EPON agreement that data are handled, then change step 421～424 over to.
Step 411 is carried out the 64B/66B coding to data.
Promptly data are carried out the coding of 64bit to 66bit in this step, to insert synchronous head (Sync Head) and control character.The detailed process of this step is same as the prior art, repeats no more herein.Change step 412 then over to.
Step 412 is carried out scrambler to data and is handled.
The purpose that scrambler is handled in this step is to produce 0-1 as much as possible or 1-0 saltus step, prevents that continuous " 0 " or continuous " 1 " from occurring, so that the receiving function that makes opposite end recovered clock and receive data better.The detailed process of this step is same as the prior art, repeats no more herein.Data after handling are sent to ONU, change step 43 then over to.
Step 421 is carried out bell idles deletion (Idle Deletion) to data.
Idle Deletion is pre-seting of FEC coding, belong to the first step in the FEC coding step, because the FEC coding need insert FEC check digit (FEC Parity) in the valid data back, Idle Deletion is exactly in order to reserve such verification bit position in data flow.The detailed process of this step is same as the prior art, repeats no more herein.Change step 422 over to.
Step 422 is carried out the 64B/66B coding to data.
This step is similar with step 411, repeats no more herein.Change step 423 then over to.
Step 423 is carried out scrambler to data and is handled.
This step is similar with step 412, repeats no more herein.Change step 424 then over to.
Step 424 is carried out the FEC coding to data.
The detailed process of this step is same as the prior art, repeats no more herein.Data after handling are sent to ONU, change step 43 then over to.
Present embodiment and previous embodiment are similar, if the synchronized result that the synchronous state machine in the unFEC Sync module shows is " success synchronously ", illustrate that then the data that ONU receives are without the FEC coded data, these data be need not to carry out fec decoder, change step 441 over to; If the synchronized result that the synchronous state machine in the FEC Sync module shows is " success synchronously ", the data that the ONU reception then is described need be carried out fec decoder for through the FEC coded data to these data, change step 451～453 over to.
Step 441 is carried out descrambling code and 64B/66B decoding to data.
This process and step 411,412 relative decode procedures, the detailed process of this step is same as the prior art, repeats no more herein.Change step 46 then over to.
Step 451 is carried out fec decoder to data.
The detailed process of this step is same as the prior art, repeats no more herein.Change step 452 then over to.
Step 452 is carried out descrambling code and 64B/66B decoding to data.
This process and step 441 are similar, and the detailed process of this step is same as the prior art, repeats no more herein.Change step 453 then over to.
Step 453 is carried out Idle Insertion to data.
Idle Insertion is just in time opposite with Idle Deletion to the processing procedure of data.Idle Insertion is in order to cooperate the fec decoder function, is the follow-up setting of fec decoder, the subsequent step in can data fec decoder step.The detailed process of this step is same as the prior art, repeats no more herein.Change step 46 then over to.
The embodiment of the invention is by need not data are carried out the descending secondary link of FEC coding in the increase of OLT side, judge receiving the synchronized result of data and synchronizing information in the ONU side, realization is to identification and processing without the FEC coded data, improved the effective bandwidth of system, for example can be increased to greater than 8.7Gbps, even can bring up to 10Gbps, and having satisfied the demand of client for high bandwidth, can use and the specific occasion that enough need not to increase for optical power budget.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in the computer read/write memory medium, described storage medium, as: ROM/RAM, magnetic disc, CD etc.
More than be the description that the data transmission method to Uplink/Downlink in the 10G EPON system carries out, below device and the system that realizes said method described.
One embodiment of the invention provides a kind of optical line terminal OLT, comprises data transmit-receive module, the structural representation of the data transmit-receive module that Fig. 9 provides for present embodiment, and data transmit-receive module 90 comprises RS sublayer 1 and PCS sublayer 3, wherein, PCS sublayer 3 comprises:
FEC control module 906 is provided with switch, and FEC control module 906 is used for according to the value that sets in advance, and judges whether the downlink data from the RS sublayer needs to carry out the FEC coding, if do not need, then control switch is communicated with second coding pass 903; Otherwise then control switch is communicated with first coding pass 901; And split the pass according to the synchronized result of burst synchronization module 908 and control, be specially, when the synchronized result of burst synchronization module 908 was the FEC coding, control switch was connected to first decoding channels 904; When the synchronized result of burst synchronization module 908 was non-FEC coding, control switch was connected to second decoding channels 902.
Send data and select module 907, be used to send the downlink data after first coding pass 901 or 903 processing of second coding pass.
First coding pass 901 is used to adopt the data processing method of 10G EPON standard code to handling from the downlink data of RS sublayer.First coding pass 901 specifically can comprise functional modules such as Idle deletion, 64B/66B coding, scrambler and FEC coding.
Second coding pass 903 is used to adopt the data processing method of 10GE to handling from the downlink data of RS sublayer.Second coding pass 903 specifically can comprise functional modules such as 64B/66B coding and scrambler.
Burst synchronization module 908 is used for upstream data is carried out synchronously, the output synchronized result.
Second decoding channels 902 is used to adopt the data processing method of 10GE that upstream data is handled.Second decoding channels 902 specifically can comprise functional modules such as descrambling code and 64B/66B decoding.
First decoding channels 904 is used to adopt the data processing method of 10G EPON standard code that upstream data is handled.First decoding channels 904 specifically can comprise functional modules such as fec decoder, descrambling code, 64B/66B decoding and Idle insertion.
Receive data and select module 900, be used for the upstream data from second decoding channels 902 or first decoding channels 904 is sent to the RS sublayer.
Data transmit-receive module 90 can also comprise gearbox 909, is used for serial data is converted to parallel data.
The embodiment of the invention provides a kind of optical network unit ONU accordingly, comprises data transmit-receive module 1000, and the structural representation of the data transmit-receive module among the ONU that Figure 10 provides for present embodiment comprises RS sublayer 2 and PCS sublayer 4.Wherein, PCS sublayer 4 comprises:
Receive data and select module 1001, be used for the downlink data from the 4th decoding channels 902 or the 3rd decoding channels 1004 is sent to the RS sublayer.
The 4th decoding channels 1002 is used to adopt the data processing method of 10GE that downlink data is handled.The 4th decoding channels 1002 specifically can comprise non-FEC synchronously, functional modules such as descrambling code and 64B/66B decoding.
The 3rd decoding channels 1004 is used to adopt the data processing method of 10G EPON standard code that downlink data is handled.The 3rd decoding channels 1004 specifically can comprise FEC synchronously, functional modules such as fec decoder, descrambling code, 64B/66B decoding and Idle insertion.
The 3rd coding pass 1005 is used to adopt the data processing method of 10G EPON standard code to handling from the upstream data of RS sublayer.The 3rd coding pass 1005 specifically can comprise functional modules such as Idle deletion, 64B/66B coding, scrambler and FEC coding.
The 4th coding pass 1003 is used to adopt the data processing method of 10GE to handling from the upstream data of RS sublayer.The 4th coding pass 1003 specifically can comprise functional modules such as 64B/66B coding and scrambler.
FEC control module 1006 is provided with switch, and FEC control module 1006 is used for according to the value that sets in advance, and judges whether the upstream data from the RS sublayer needs to carry out the FEC coding, if do not need, then control switch is communicated with the 4th coding pass 1003; Otherwise then control switch is communicated with the 3rd coding pass 1005; And split the pass according to the synchronized result of the 4th decoding channels 1002 and the 3rd decoding channels 1004 and control, be specially, when the synchronized result of the 3rd decoding channels 1004 was the FEC coding, control switch was connected to the 3rd decoding channels 1004; When the synchronized result of the 4th decoding channels 1002 was non-FEC coding, control switch was connected to the 4th decoding channels 1002.
Send data and select module 1007, be used for the upstream data of the 3rd coding pass 1003 or the 4th coding pass 1005 is sent to gearbox 1008.
OLT that present embodiment provides and ONU, can solve in the prior art owing to the transmission data are carried out the effective bandwidth problem of smaller that the FEC coding produces, thereby improved the effective bandwidth of system, for example can be increased to greater than 8.7Gbps, even can bring up to 10Gbps, satisfied client's demand.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (10)
1. the data transmission method of down link in the 10G Ethernet passive optical network EPON system is characterized in that, comprising:
Whether optical line terminal OLT carries out forward error correction FEC coding to downlink data according to the identification information judgment that presets; If yes, then adopt the 10G EPON agreement that comprises the FEC coding that described downlink data is encoded; Otherwise, adopt the 10GE agreement that described downlink data is encoded;
Export the downlink data behind the coding to ONU by down link,, and, the downlink data after synchronous is decoded according to synchronized result so that ONU carries out synchronously downlink data.
2. method according to claim 1 is characterized in that,
Described employing 10G EPON agreement is encoded to described downlink data and is comprised bell idles deletion, 64B/66B coding, scrambler and FEC coding;
Described employing 10GE agreement is encoded to described downlink data and is comprised 64B/66B coding and scrambler.
3. the data transmission method of down link in the 10G Ethernet passive optical network EPON system is characterized in that, comprising:
Optical network unit ONU receives the downlink data from optical line terminal OLT;
Described ONU carries out Synchronous Processing to described downlink data;
When judging that according to the result of Synchronous Processing downlink data does not carry out forward error correction FEC coding, adopt the 10GE agreement that the data after are synchronously decoded;
When judging that according to the result of Synchronous Processing downlink data has the forward error correction of carrying out FEC coding, adopt the 10G EPON agreement that comprises fec decoder that the data after are synchronously decoded.
4. method according to claim 3 is characterized in that, described employing 10G EPON agreement is decoded to the data after synchronously and specifically comprised: FEC synchronously, fec decoder, descrambling code, 64B/66B decoding and bell idles insert;
Described employing 10GE agreement is decoded to the data after synchronously and is specifically comprised: non-FEC synchronously, descrambling code and 64B/66B decoding.
5. an optical line terminal OLT comprises data transmit-receive module, it is characterized in that, described data transmit-receive module comprises:
First coding pass is used to adopt the 10G Ethernet passive optical network EPON agreement that comprises forward error correction FEC coding that downlink data is encoded;
Second coding pass is used to adopt 10G Ethernet E agreement that downlink data is encoded;
The FEC control module is used for whether downlink data being carried out the FEC coding according to default identification information judgment, if for being then with described first coding pass described downlink data to be encoded; Otherwise, described downlink data is encoded with described second coding pass;
Send data and select module, be used for the downlink data behind described first coding pass or described second coding pass coding is sent to down link.
6. OLT according to claim 5 is characterized in that, described data transmit-receive module also comprises first decoding channels, second decoding channels and burst synchronization module,
Described first decoding channels is used to adopt the 10G EPON agreement that comprises fec decoder that upstream data is decoded;
Described second decoding channels is used to adopt the 10GE agreement that upstream data is decoded;
Described burst synchronization module is used for upstream data is carried out synchronously, the output synchronized result;
The FEC control module also is used for judging according to described synchronized result whether upstream data has carried out the FEC coding, if for being then with described first decoding channels upstream data to be decoded; Otherwise, upstream data is decoded with described second decoding channels.
7. OLT according to claim 6 is characterized in that, described data transmit-receive module comprises that also receiving data selects module, is used for the upstream data from described second decoding channels or first decoding channels is sent to mediation RS sublayer.
8. a 10G Ethernet passive optical network EPON system comprises optical line terminal OLT and optical network unit, it is characterized in that,
Described OLT, being used for the default identification information of basis judges when needs carry out forward error correction FEC coding to downlink data, employing comprises that the 10G EPON agreement of FEC coding encodes to downlink data, otherwise, adopt the 10GE agreement that downlink data is encoded, the downlink data behind the coding is sent to ONU;
Described ONU, be used for the downlink data from OLT is carried out Synchronous Processing, result according to Synchronous Processing judges whether downlink data has carried out the FEC coding, if yes, then adopt and comprise that the 10G EPON agreement of fec decoder decodes to downlink data, otherwise, adopt the 10GE agreement that downlink data is decoded.
9. system according to claim 8 is characterized in that,
Described ONU is used for also whether needs carry out the FEC coding to upstream data according to default identification information judgment, if for being, then adopt 10G EPON agreement that upstream data is encoded, the upstream data behind the coding is sent to ONU; Otherwise, adopt the 10GE agreement that upstream data is encoded, the upstream data behind the coding is sent to ONU;
Described OLT also is used for upstream data is carried out burst synchronization, result according to burst synchronization judges whether upstream data has carried out the FEC coding, if do not have, then adopts the 10GE agreement that downlink data is decoded, otherwise, adopt 10G EPON agreement that downlink data is decoded.
10. system according to claim 9 is characterized in that, described ONU also is used for judging when not needing that upstream data carried out the FEC coding, for the upstream data behind the coding adds non-FEC burst leading character; Otherwise, for the upstream data behind the coding adds FEC burst leading character.
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