CN102239652A - Data transmission method,optical line terminal and system - Google Patents
Data transmission method,optical line terminal and system Download PDFInfo
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- CN102239652A CN102239652A CN2011800006360A CN201180000636A CN102239652A CN 102239652 A CN102239652 A CN 102239652A CN 2011800006360 A CN2011800006360 A CN 2011800006360A CN 201180000636 A CN201180000636 A CN 201180000636A CN 102239652 A CN102239652 A CN 102239652A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
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Abstract
The invention provides a data transmission method, OLT (optical line terminal) and system in a 10G EPON (Ethernet Passive Optical Network), belonging to the photo-communication field. The method comprises the following steps of: detecting the link circuit quality between ONUs (Optical Network Unit); determining a length of a data block according to the detection result and determining a parameter of RS (Reed-Solomon) encryption algorithm according to the length of a data block; performing FEC (Forward Error Correction) encoding to down link circuit by RS encryption algorithm and transmitting to the OUNs. The OLT comprises a detecting module, an encoding module and a transmitting module. The system comprises the OLT and OUN. The invention enables the FEC encoding to become a selectable processing process and improves the bandwidth efficiency.
Description
Technical field
The present invention relates to optical communication field, particularly a kind of data transmission method, optical line terminal and system.
Background technology
10G EPON (Ethernet Passive Optical Network, Ethernet passive optical network) adopts RS (Reed-Solomon, Reed Solomon code) (255,223) algorithm is as uplink and downlink FEC (Forward Error Correction, forward error correction) encryption algorithm, and adopt fixing FEC code word (codeword) form to carry out the up-downgoing transmission.Because the fixing RS (255,223) that adopts carries out the FEC coding, the code efficiency of 10G EPON is 87% only, and for optical fiber link, actual available bandwidth has only 8.7Gbps in the data bandwidth of 10Gbps.Though the 10GEPONFEC coding can increase the optical power budget of system, but big splitting ratio, the long access in the abominable occasion of distance, relatively poor environment such as line quality, the coding gain that RS (255,223) coding can provide still can not satisfy the demand of optical power budget.And little at splitting ratio, to insert distance short, line quality well waits in the good occasion of environment, the coding gain that RS (255,223) coding is introduced has significantly reduced available bandwidth again, if do not adopt FEC to encode then can't satisfy the budgetary request of luminous power again.
Prior art has proposed a kind of 10G EPON OLT (Optical Line Terminal, optical line terminal) and ONU (Optical Network Unit, optical network unit) the FEC coding method between can be supported FEC on/off (FEC encode enable/disable) configuration.When being configured to FEC when enabling, adopt RS (255,223) to carry out the FEC coding, when being configured to FEC when forbidding, do not carry out the FEC coding, thereby can eliminate FEC coding expense, improve up-downgoing effective bandwidth, between coding gain and efficiency of transmission, carry out compromise selection.
In realizing process of the present invention, the inventor finds that above-mentioned prior art has following shortcoming at least:
The FEC encryption algorithm can only enable and forbid between select, adjustable leeway is little, self adaptation is relatively poor.
Summary of the invention
The embodiment of the invention provides a kind of data transmission method, optical line terminal and system, realizes adaptively selected FEC coding, and self adaptation is regulated coding gain and the expense of encoding, and has effectively improved utilization of network bandwidth.
A kind of data transmission method is applied among the 10G Ethernet passive optical network EPON, and described method comprises:
To and optical network unit ONU between link-quality detect;
According to testing result specified data block length, determine the parameter of Read-Solomon RS encryption algorithm according to described data block length;
According to the parameter of described RS encryption algorithm, with the RS encryption algorithm down link data is carried out the FEC forward error correction coding after, send to described ONU.
A kind of optical line terminal OLT is applied among the 10G Ethernet passive optical network EPON, and described OLT comprises:
Detection module, be used for to and optical network unit ONU between link-quality detect;
Coding module, be used for according to testing result specified data block length, determine the parameter of Read-Solomon RS encryption algorithm according to described data block length,, down link data is carried out the FEC forward error correction coding with described RS encryption algorithm according to the parameter of described RS encryption algorithm;
Sending module is used for the down link data behind the FEC coding is sent to described ONU.
A kind of data transmission system is applied among the 10G Ethernet passive optical network EPON, and described system comprises:
Optical line terminal OLT, be used for to and optical network unit ONU between link-quality detect, according to testing result specified data block length, determine the parameter of Read-Solomon RS encryption algorithm according to described data block length, parameter according to described RS encryption algorithm, with described RS encryption algorithm down link data is carried out the FEC forward error correction coding, generate and described RS encryption algorithm corresponding check piece synchronous head, add described check block synchronous head before the down link data behind described FEC coding, send to described ONU then;
Described ONU, be used to receive described check block synchronous head of interpolation that described OLT sends and the down link data behind the FEC coding, and search check block synchronous head, corresponding relation according to check block synchronous head and RS encryption algorithm, determine the RS encryption algorithm of the described check block synchronous head correspondence that searches, decode according to the down link data of the described RS encryption algorithm of determining after, obtain described down link data described FEC coding.
Above-mentioned data transmission method, optical line terminal and system that the embodiment of the invention provides have following beneficial effect:
By the link-quality between detection and the ONU, thereby determine that according to testing result specified data block length the RS algorithm carries out the FEC coding, realized the adaptively selected FEC coding of 10G EPON system, and self adaptation is regulated coding gain and coding expense, overcome prior art FEC encryption algorithm can only enable and forbid between select the relatively poor defective of self adaptation, effectively improved utilization of network bandwidth.
Description of drawings
Fig. 1 is a kind of data transmission method flow chart that the embodiment of the invention 1 provides;
Fig. 2 is the another kind of data transmission method flow chart that the embodiment of the invention 1 provides;
Fig. 3 is the data transmission method flow chart that the embodiment of the invention 2 provides;
Fig. 4 is the OLT structure chart that the embodiment of the invention 3 provides;
Fig. 5 is the ONU structure chart that the embodiment of the invention 4 provides;
Fig. 6 is the data transmission system structure chart that the embodiment of the invention 5 provides;
Fig. 7 is that the downlink data transmission physical sublayer that the embodiment of the invention 5 provides is realized schematic diagram;
Fig. 8 is that the transmitting uplink data physical sublayer that the embodiment of the invention 5 provides is realized schematic diagram.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
Embodiment 1
Referring to Fig. 1, present embodiment provides a kind of data transmission method, is applied to comprise among the 10G Ethernet passive optical network EPON:
101: the link-quality between self and the ONU is detected;
102:, determine the parameter of Read-Solomon RS encryption algorithm according to described data block length according to testing result specified data block length;
103: according to the parameter of this RS encryption algorithm, with described RS encryption algorithm down link data is carried out FEC coding after, send to ONU.
Above-mentioned steps 101 to 103 can be carried out by OLT, select the RS encryption algorithm as the FEC encryption algorithm, the RS encryption algorithm can be expressed as usually RS (n, k), wherein, n indication code word length, k represents data block length, n-k represents check block length, in the present embodiment, n=255, k are according to the link-quality between OLT and the ONU and fixed, are variable.
Alternatively, above-mentioned 103 can specifically comprise:
Generate and described RS encryption algorithm corresponding check piece synchronous head, add this check block synchronous head before the down link data behind this FEC coding, send to ONU then.
The said method that present embodiment provides is a data transmission method for uplink, by the link-quality between detection and the ONU, thereby determine that according to testing result specified data block length the RS algorithm carries out the FEC coding, realized the adaptively selected FEC coding of 10G EPON system, and self adaptation is regulated coding gain and coding expense, overcome prior art FEC encryption algorithm can only enable and forbid between select the relatively poor defective of self adaptation, effectively improved utilization of network bandwidth.
Referring to Fig. 2, present embodiment also provides a kind of data transmission method, is applied to comprise among the 10G Ethernet passive optical network EPON:
201: the down link data behind the FEC forward error correction coding that the reception optical line terminal OLT is sent;
202: search check block synchronous head in the down link data behind this FEC coding;
203:, determine the RS encryption algorithm of the check block synchronous head correspondence that searches according to the corresponding relation of check block synchronous head and RS encryption algorithm;
204: decode according to the down link data of the RS encryption algorithm of determining after, obtain described down link data to this FEC coding.
Alternatively, above-mentioned data receive method can also comprise:
Receive the mandate frame GATE that OLT sends, from this mandate frame, obtain the parameter of described RS encryption algorithm,, use this RS encryption algorithm that uplink data is carried out sending to OLT behind the FEC coding according to the parameter of this RS encryption algorithm.
Above-mentioned steps 201 to 204 can be carried out by ONU.
The said method that present embodiment provides is a data receive method, by receiving the down link data after FEC encodes, search check block synchronous head carries out fec decoder to determine corresponding RS algorithm, realize the fec decoder behind the adaptive FEC coding of 10G EPON system, effectively improved utilization of network bandwidth.
Embodiment 2
Referring to Fig. 3, present embodiment provides a kind of data transmission method, is applied to comprise among the 10G Ethernet passive optical network EPON:
Link error rates between 301:OLT detection and the ONU;
Usually, OLT can with a plurality of ONU between link to each other, and the link between each ONU may be all inequality, and every link all has the link error rates of oneself, and the link error rates that OLT detects in the present embodiment is meant the link error rates of the link between the ONU that communicates with it.
302:OLT selects a number as correcting a mistake several t in default scope according to this link error rates, and wherein, default scope is 0 to 32 integer;
303:OLT is according to several t that correct a mistake of having obtained, according to following formula calculated data block length k:
k＝n-2×t；
Wherein, n is a code word size, and n=255, and n-k represents check block length, and the big more representative coding of this value expense is big more, and the more little representative coding of this value expense is more little.
In the present embodiment, coding is integrated for convenience, and preferably, t is 4 integral multiple.When t=0, encryption algorithm is RS (255,255), is equivalent to the FEC coding and forbids that transfer of data need not to carry out the FEC coding.When t=32, reach maximum coding expense, can be applied to the abominable occasion of environment.When t=16, be the encryption algorithm of 802.3av-2009 standard definition, i.e. RS (255,223).When t gets other value, be applicable to the occasion of varying environment respectively.For example, if the link error rates that current detection arrives is bigger, illustrate that link-quality is relatively poor, then increase the coding expense, get bigger t value, as t=32, then k=191 obtains RS (255,191) encryption algorithm; If the link error rates that current detection arrives is less, illustrate that link-quality is better, then reduce the expense of encoding, get less t value, as t=4, then k=247 obtains RS (255,247) encryption algorithm.
304:OLT according to the data block length k that obtains determine RS encryption algorithm RS (255, k), down link data is carried out FEC coding with this RS encryption algorithm;
Wherein, comprise in the data behind the FEC coding: down link data and data block synchronous head, and check block and check block synchronous head.The data block synchronous head is used for ONU identification down link data, and the check block synchronous head is used for ONU identification check block.Data block synchronous head and check block synchronous head can be provided with as required, in the present embodiment, the check block synchronous head that different RS encryption algorithms is corresponding different, OLT can be in advance for the corresponding RS encryption algorithm of each t value is provided with a corresponding check piece synchronous head, identify check block under the different RS encryption algorithms to make things convenient for ONU.
(255, k) corresponding check piece synchronous head adds this check block synchronous head before the down link data behind the FEC coding, and OLT sends to ONU with the down link data that adds after check block synchronous head and FEC encode then with RS in the 305:OLT generation;
After 306:ONU received the data of adding behind check block synchronous head and the FEC coding, search check block synchronous head according to the corresponding relation of check block synchronous head and RS encryption algorithm, was determined the RS encryption algorithm of the check block synchronous head correspondence that searches;
In the present embodiment, OLT and ONU can store the corresponding relation of RS encryption algorithm and check block synchronous head in advance, comprise corresponding t value or the like, to make things convenient for encoding and decoding and transfer of data.This corresponding relation can be as shown in table 1.
Table 1
The value of the check block synchronous head in the table 1 only is a kind of concrete implementation, can certainly adopt other value, and the embodiment of the invention is not done concrete qualification to this.Wherein, all corresponding different check block synchronous head of each t value, the length of each check block synchronous head is all inequality, and this length changes with the length of check block, and the length of check block is that n-k is big more, and then the length of check block synchronous head is also big more.For example, t=0, no parity check block sum check piece synchronous head, this moment, the FEC coding was forbidden; When t is not 0, is the FEC coding and enables; Wherein, t=4, check block length is 18 byte, the check block synchronous head is " 11 " two bits; T=8, check block length is 28 bytes, the check block synchronous head is " 1111 " totally four bits, when t=16, is the encryption algorithm (255,223) of 802.3av-2009 standard definition, or the like.
Coding gain, coding expense and available bandwidth have also been listed in the table 1.Coding gain is meant and uses coding and use the two signal to noise ratio poor of coding under certain error rate condition, the coding expense is meant FEC coding code length shared ratio in the code word length overall, the data from table 1 as seen, the t value is big more, the coding expense is big more, and coding gain is also big more.Available bandwidth is meant the bandwidth that is used for the actual transmissions data in the system, promptly overall system bandwidth deduct the coding expense after the remaining actual bandwidth that is used to transmit data, it is followed the variation of t value and changes, the t value is high more, available bandwidth is more little, and the t value is more little, and available bandwidth is big more.For example, in the 10GEPON system, the available bandwidth during t=4 is 9.68Gbps, and the available bandwidth during t=20 is 8.39Gbps or the like.
In this step, ONU is behind the down link data behind the FEC coding of receiving, search check block synchronous head, in the corresponding relation of check block synchronous head and the t value of storage in advance, search the corresponding t value of check block synchronous head that searches then, thereby determine corresponding RS encryption algorithm, carry out the fec decoder of down link data with this.
Down link data after 307:ONU encodes to the FEC that receives according to the RS encryption algorithm of determining is decoded, and obtains this down link data.
Further, said method can also comprise:
OLT will determine that the parameter of good RS encryption algorithm sends to ONU by authorizing frame GATE, after ONU receives this mandate frame, obtain the parameter of RS encryption algorithm wherein, use this RS encryption algorithm that uplink data is carried out the FEC coding according to this parameter, and the uplink data behind the FEC coding is sent to OLT.Wherein, the parameter that sends to the RS encryption algorithm of ONU comprises data block length k at least, can also comprise code word size n further.For example, when code word size n is the value of OLT and ONU both sides' acquiescence, can only sends data block length k and get final product.
Behind the uplink data of OLT after receiving this FEC coding, obtain uplink data thereby can carry out fec decoder according to the RS encryption algorithm that licenses to ONU.Certainly, OLT in the present embodiment also can adopt the RS (255 of standard, 223) encryption algorithm carries out the FEC coding, need not then to inform the current definite new RS encryption algorithm of ONU by authorization message that the FEC encryption algorithm that ONU will give tacit consent to the use standard carries out encoding and decoding.
In the present embodiment, particularly, OLT can authorize at GATE increases a FEC type of coding field in the frame, carry and determine good RS encryption algorithm, as representing with FEC_Type.For example, can or indicate increase FEC type of coding field in the territory (Flags) at the authorization number (Number of grants) of GATE frame, can certainly increase this FEC type of coding field in the extension bits of other reservations, the embodiment of the invention is not done concrete qualification to this.
The said method that present embodiment provides is to carry out transfer of data between OLT and an ONU, in the practical application, OLT carries out transfer of data usually and between a plurality of ONU, the process of transfer of data is identical with the process that said method is described, but, the OLT demarcation (Burst Delimiter) that can happen suddenly to a plurality of uplink datas of receiving detects, and distinguishes each uplink data from which ONU with this, and present embodiment is not done too much explanation to this.
The said method that present embodiment provides, by the link-quality between OLT detection and the ONU, thereby determine that according to testing result specified data block length the RS algorithm carries out the FEC coding, realized the adaptively selected FEC coding of 10G EPON system, and self adaptation is regulated coding gain and coding expense, effective bandwidth can change between 8.7Gbps～10Gbps, has effectively improved utilization of network bandwidth.With prior art FEC encryption algorithm can only enable and forbid between select to compare, overcome the relatively poor defective of self adaptation, the FEC algorithm not only can be selected RS (255,223), can also select the RS encryption algorithm of other k value, non-standard FEC encryption algorithm can be supported, thereby plurality of application scenes can be adapted to.
Embodiment 3
Referring to Fig. 4, present embodiment provides a kind of optical line terminal OLT, is applied to comprise among the 10G Ethernet passive optical network EPON:
Sending module 403 is used for the down link data behind the FEC coding is sent to described ONU.
In the present embodiment, detection module 401 can be used for: the link error rates between detection and the ONU.
In the present embodiment, coding module 402 can comprise:
Computing unit is used for selecting a number as correcting a mistake several t in default scope according to testing result, and according to following formula calculated data block length k:
k＝n-2×t；
Wherein, n is a code word size, and n=255, and described default scope is 0 to 32 integer.
In the present embodiment, above-mentioned OLT can also comprise:
Generation module is used for generating and described RS encryption algorithm corresponding check piece synchronous head, adds this check block synchronous head before the down link data behind the FEC coding;
Correspondingly, sending module 403 down link data that specifically is used for adding behind described check block synchronous head and the FEC coding sends to ONU.
In the present embodiment, sending module 403 also is used for: the parameter of described RS encryption algorithm is sent to ONU by authorizing frame GATE, make ONU use this RS encryption algorithm that uplink data is carried out the FEC coding.Wherein, the parameter that sends to the RS encryption algorithm of ONU comprises data block length k at least, can also comprise code word size n further.For example, when code word size n is the value of OLT and ONU both sides' acquiescence, can only sends data block length k and get final product.
Can implement the method among above-mentioned arbitrary method embodiment on the OLT that present embodiment provides, its specific implementation process sees method embodiment for details, repeats no more here.
The above-mentioned OLT that present embodiment provides, by the link-quality between detection and the ONU, thereby determine that according to testing result specified data block length the RS algorithm carries out the FEC coding, realized the adaptively selected FEC coding of 10G EPON system, and self adaptation is regulated coding gain and coding expense, effective bandwidth can change between 8.7Gbps～10Gbps, has effectively improved utilization of network bandwidth.With prior art FEC encryption algorithm can only enable and forbid between select to compare, overcome the relatively poor defective of self adaptation, the FEC algorithm not only can be selected RS (255,223), can also select the RS encryption algorithm of other k value, non-standard FEC encryption algorithm can be supported, thereby plurality of application scenes can be adapted to.
Embodiment 4
Referring to Fig. 5, present embodiment provides a kind of optical network unit ONU, is applied to comprise among the 10G Ethernet passive optical network EPON:
In the present embodiment, receiver module 501 also is used for: receive the mandate frame GATE that OLT sends; Correspondingly, ONU also comprises:
Coding module is used for obtaining described RS encryption algorithm from this mandate frame, uses this RS encryption algorithm that uplink data is carried out the FEC coding;
Sending module is used for the uplink data behind this FEC coding is sent to OLT.
The above-mentioned ONU that present embodiment provides, by receiving the down link data after FEC encodes, search check block synchronous head carries out fec decoder to determine corresponding RS algorithm, has realized the fec decoder behind the adaptive FEC coding of 10G EPON system, has effectively improved utilization of network bandwidth.
Embodiment 5
Referring to Fig. 6, present embodiment provides a kind of data transmission system, is applied to comprise among the 10G Ethernet passive optical network EPON:
Optical line terminal OLT 601, be used for to and ONU 602 between link-quality detect, according to testing result specified data block length, determine the parameter of RS encryption algorithm according to described data block length, according to the parameter of this RS encryption algorithm, with this RS encryption algorithm down link data is carried out the FEC forward error correction coding, generate and this RS encryption algorithm corresponding check piece synchronous head, add this check block synchronous head before the down link data behind the FEC coding, send to ONU 602 then;
In the present embodiment, OLT 601 also is used for: the parameter of described RS encryption algorithm is sent to ONU 602 by authorizing frame; Correspondingly, ONU 602 also is used for: receive described mandate frame, obtain the parameter of the described RS encryption algorithm in the described mandate frame, use described RS encryption algorithm that uplink data is carried out sending to OLT601 behind the FEC coding according to the parameter of this RS encryption algorithm.OLT 601 obtains uplink data thereby can carry out fec decoder according to the RS encryption algorithm that licenses to ONU after receiving uplink data behind the FEC coding that ONU sends.Certainly, OLT in the present embodiment also can adopt RS (255,2, the 223) encryption algorithm of standard to carry out the FEC coding, then need not to inform the current definite new RS encryption algorithm of ONU by authorization message, the FEC encryption algorithm that ONU will give tacit consent to the use standard carries out encoding and decoding.
Referring to Fig. 7, the downlink data transmission physical sublayer of the said system that provides for present embodiment is realized schematic diagram.Among the figure, OLT and ONU include following each layer: RS (Reconciliation Sublayer, reconciliation sublayer), PCS (Physical Code Sublayer, Physical Coding Sublayer), PMA (Physical Medium Attachment, physical medium is additional) sublayer and PMD (Physical Medium Dependent, physical medium is relevant) sublayer.The PCS sublayer of OLT comprises: coding module, have the FEC encoding function, and identical with coding module 402 among the embodiment 3, do not give unnecessary details herein.Certainly, the PCS sublayer of OLT also has other functions, and as idle frame deletion (Idle Deletion), 64B/66B coding (Encode), scramble (Scramble) coding and string and boxcar (Gearbox) etc. are not done too much explanation herein.The PCS sublayer of ONU comprises: FEC Sync module, have FEC check block synchronous head function of search, and the fec decoder module, having the fec decoder function, decode procedure was described in the present embodiment, did not give unnecessary details herein.Certainly, the PCS sublayer of ONU also has other functions, as also boxcar, scramble decoding, 64B/66B decoding (Decode), idle frame insertion (Idle Insertion) etc. of string, does not do too much explanation herein.
Referring to Fig. 8, the transmitting uplink data physical sublayer of the said system that provides for present embodiment is realized schematic diagram.Wherein, each sublayer of OLT and ONU divide with Fig. 7 in identical, the PCS sublayer of ONU comprises the FEC coding module, has the FEC encoding function, cataloged procedure was described in the present embodiment, repeated no more herein.In addition, the PCS sublayer of ONU also has other functions, and as the idle frame deletion, 64B/66B coding, scrambling encode, Data Detection (Data Detector) and string and boxcar etc. are not done too much explanation herein.The PCS sublayer of OLT comprises FEC Sync module, has FEC check block synchronous head function of search, and the fec decoder module, has the fec decoder function, and decode procedure was described in the present embodiment, repeated no more.In addition, the PCS sublayer of OLT also has other functions, as also boxcar, scramble decoding, 64B/66B decoding, idle frame insertion etc. of string, does not do too much explanation herein.
The said system that present embodiment provides, by the link-quality between OLT detection and the ONU, thereby determine that according to testing result specified data block length the RS algorithm carries out the FEC coding, realized the adaptively selected FEC coding of 10G EPON system, and self adaptation is regulated coding gain and coding expense, effective bandwidth can change between 8.7Gbps～10Gbps, has effectively improved utilization of network bandwidth.With prior art FEC encryption algorithm can only enable and forbid between select to compare, overcome the relatively poor defective of self adaptation, the FEC algorithm not only can be selected RS (255,223), can also select the RS encryption algorithm of other k value, non-standard FEC encryption algorithm can be supported, thereby plurality of application scenes can be adapted to.
Need to prove at last, one of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method, be to instruct relevant hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (ROM) or stores memory body (RAM) etc. at random.
Each functional unit in the embodiment of the invention can be integrated in the processing module, also can be that the independent physics in each unit exists, and also can be integrated in the module two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, also can adopt the form of software function module to realize.If described integrated module realizes with the form of software function module and during as independently production marketing or use, also can be stored in the computer read/write memory medium.The above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.Above-mentioned each device or system can carry out the method among the correlation method embodiment.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. data transmission method is applied to it is characterized in that described method comprises among the 10G Ethernet passive optical network EPON:
To and optical network unit ONU between link-quality detect;
According to testing result specified data block length, determine the parameter of Read-Solomon RS encryption algorithm according to described data block length;
According to the parameter of described RS encryption algorithm, with the RS encryption algorithm down link data is carried out the FEC forward error correction coding after, send to described ONU.
2. method according to claim 1 is characterized in that, to and optical network unit ONU between link-quality detect, comprising:
Link error rates between detection and the described ONU.
3. method according to claim 1 is characterized in that, according to testing result specified data block length, comprising:
In default scope, select a number as correcting a mistake several t according to testing result, and according to following formula calculated data block length k:
k＝n-2×t；
Wherein, described n is a code word size, and described n=255, and described default scope is 0 to 32 integer.
4. method according to claim 3 is characterized in that, described t is 4 integral multiple.
5. method according to claim 1 is characterized in that, according to the parameter of described RS encryption algorithm, with the RS encryption algorithm down link data is carried out the FEC forward error correction coding after, send to described ONU, comprising:
According to the parameter of described RS encryption algorithm, down link data is carried out the FEC forward error correction coding with the RS encryption algorithm;
Generate and described RS encryption algorithm corresponding check piece synchronous head, add described check block synchronous head before the down link data behind described FEC coding, send to described ONU then.
6. method according to claim 1 is characterized in that, described method also comprises:
The parameter of described RS encryption algorithm is sent to described ONU by authorizing frame GATE, make described ONU use described RS encryption algorithm that uplink data is carried out the FEC coding.
7. optical line terminal OLT is applied to it is characterized in that described OLT comprises among the 10G Ethernet passive optical network EPON:
Detection module, be used for to and optical network unit ONU between link-quality detect;
Coding module, be used for according to testing result specified data block length, determine the parameter of Read-Solomon RS encryption algorithm according to described data block length,, down link data is carried out the FEC forward error correction coding with described RS encryption algorithm according to the parameter of described RS encryption algorithm;
Sending module is used for the down link data behind the FEC coding is sent to described ONU.
8. OLT according to claim 7 is characterized in that, described detection module is used for: the link error rates between detection and the described ONU.
9. OLT according to claim 7 is characterized in that, described coding module comprises:
Computing unit is used for selecting a number as correcting a mistake several t in default scope according to testing result, and according to following formula calculated data block length k:
k＝n-2×t；
Wherein, described n is a code word size, and described n=255, and described default scope is 0 to 32 integer.
10. OLT according to claim 7 is characterized in that, described OLT also comprises:
Generation module is used for generating and described RS encryption algorithm corresponding check piece synchronous head, adds described check block synchronous head before the down link data behind described FEC coding;
The down link data that described sending module is used for adding after described check block synchronous head and FEC encode sends to described ONU.
11. OLT according to claim 7, it is characterized in that, described sending module also is used for: the parameter of described RS encryption algorithm is sent to described ONU by authorizing frame GATE, make described ONU use described RS encryption algorithm that uplink data is carried out the FEC coding.
12. a data transmission system is applied to it is characterized in that described system comprises among the 10G Ethernet passive optical network EPON:
Optical line terminal OLT, be used for to and optical network unit ONU between link-quality detect, according to testing result specified data block length, determine the parameter of Read-Solomon RS encryption algorithm according to described data block length, parameter according to described RS encryption algorithm, with described RS encryption algorithm down link data is carried out the FEC forward error correction coding, generate and described RS encryption algorithm corresponding check piece synchronous head, add described check block synchronous head before the down link data behind described FEC coding, send to described ONU then;
Described ONU, be used to receive described check block synchronous head of interpolation that described OLT sends and the down link data behind the FEC coding, and search check block synchronous head, corresponding relation according to check block synchronous head and RS encryption algorithm, determine the RS encryption algorithm of the described check block synchronous head correspondence that searches, decode according to the down link data of the described RS encryption algorithm of determining after, obtain described down link data described FEC coding.
13. system according to claim 12 is characterized in that, described OLT also is used for: the parameter of described RS encryption algorithm is sent to described ONU by authorizing frame;
Described ONU also is used for: receive described mandate frame, obtain the parameter of the described RS encryption algorithm in the described mandate frame, use described RS encryption algorithm that uplink data is carried out sending to described OLT behind the FEC coding according to the parameter of described RS encryption algorithm.
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| PCT/CN2011/074370 WO2011144051A2 (en) | 2011-05-20 | 2011-05-20 | Data transmission method, optical line terminal and system |
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| WO2011144051A2 (en) | 2011-11-24 |
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