CN101374145B - Method and apparatus for adapting velocity - Google Patents
Method and apparatus for adapting velocity Download PDFInfo
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- CN101374145B CN101374145B CN200710147925A CN200710147925A CN101374145B CN 101374145 B CN101374145 B CN 101374145B CN 200710147925 A CN200710147925 A CN 200710147925A CN 200710147925 A CN200710147925 A CN 200710147925A CN 101374145 B CN101374145 B CN 101374145B
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Abstract
The invention discloses a velocity adaptation method, which comprises the following steps: receiving an optical fiber channel (FC) signal, and identifying a primitive signal in the received FC signal; calculating continuously present identical primitive signals in the FC signal, and performing velocity adaptation processing on the FC signal if he number reaches a preset threshold. The invention also discloses a velocity adaptation device and a framing protocol transparent mode (GFPT) device. The technical proposal does not specifically identify the primitive in the FC signal, determines the continuous repetition number of the primitive signal, and performs velocity adaptation processing based on the continuous repetition number to simplify the judge manner of the velocity adaptation signal and greatly reduce the realization complexity. Moreover, the processing method does not relate to the determination of the specific primitive signal type to well support the expansion of the FC protocol in future.
Description
Technical field
The present invention relates to field of network data transmission technology, particularly a kind of method and apparatus of rate adapted.
Background technology
Optical-fibre channel (Fiber channel; FC) business can adopt generic framing procedure, GFP transparent mode (General framing protocol transparent mode; GFPT) encapsulation technology is packaged into generic framing procedure, GFP (GFP) frame pellucidly; Then through synchronous digital hierarchy (Synchronous DigitalHierarchy; SDH), Synchronous Optical Network (Synchronous Optical Network, SONET) or optical transport network (Optical Transport Network OTN) transmits.The position of FC equipment in network is as shown in Figure 1, and the signal of FC equipment output is sent to GFPT equipment through the FC interface; After changing by GFPT equipment again, transmit through SDH/SONET/OTN.FC equipment can be FC switch, server, disk array etc.; GFPT equipment can be dense wave division multipurpose (DensityWavelength Division Multiplex, DWDM) equipment, SDH equipment etc.
It is as shown in Figure 2 that GFPT equipment is typically handled block diagram:
Receive direction; Deserializer in serializer/de-serializers (Serdes) unit 201 is gone here and there to the serial FC business that receives and is changed; With the data inputs Physical Coding Sublayer after the conversion (physical codesublayer, PCS) processing unit 202 is accomplished the professional physical layer process of FC, promptly carries out the identification of 8 bits (B)/10B coding; The 8B/10B data that identify are accomplished 64B/65B coding (encode) through 64B/65B coding unit 203, with the piece character of a control character in the data and a 65B of data character composition; Resulting 65B piece character is encapsulated by GFP encapsulation unit 204, and 8 65B pieces are formed a superblock (superblock), and several superblock just can be encapsulated in the gfp frame; Packaged GFP data are mapped in the SDH/SONET/OTN frame by map unit 205, send through the SDH/SONET/OTN business interface.
Sending direction is in the opposite direction with acceptance; Earlier from the SDH/SONET/OTN interface, identify gfp frame by recognition unit 206; Again by gfp frame decompress(ion) unit 207 in the gfp frame that is identified; Recover 65B piece character, decode through 64B/65B by 64B/65B decoding unit 208 again, obtain the 8B/10B character code; And then carry out serializer in physical layer process and the serializer/de-serializers unit 201 through PCS processing unit 202 and carry out and go here and there conversion, generate serial data at last and send.
Above-mentioned processing procedure relates to the adaptive problem of clock rate, and is as shown in Figure 1, and the clock frequency of FC device A and FC equipment B is different, according to the FC consensus standard, allows the clock jitter of 100ppm.GFPT equipment also is to send data according to the clock frequency that equipment self provides to the FC equipment sending data time usually, so the professional clock frequency of transmission FC also there are differences between them.
Suppose the clock frequency of the clock frequency of FC device A greater than the FC equipment B; After the data that the FC device A sends out receive through GFPT equipment 1; Because the bandwidth of SDH/SONET/OTN equipment is general bigger; Therefore can be sent to GFPT equipment 2 smoothly, it is adaptive that this transport process need not carry out clock rate.GFPT equipment 2 according to the speed of FC agreement regulation when the FC equipment B is sent data; Because the clock of FC equipment B is slow; Therefore can not all send; At this time just need carry out rate adapted, otherwise the data that the FC device A sends are more than the data that GFPT equipment 2 sends to the FC equipment B, can cause going wrong.Therefore, GFPT equipment 2 needs to delete some does not at this moment influence the redundant data of communication, accomplishes the adaptive of timing differential.Otherwise when the clock frequency of FC device A was lower than the clock frequency of FC equipment B, 2 of GFPT equipment need insert some redundant signals and carry out rate adapted in sending data.
The FC agreement has stipulated that the data of following several types can be used to carry out the clock rate coupling:
1, (the primitive sequence is become with 3 data character group by a control character primitive for ordered set, OS) sequence, repeats when being in particular state to send, and continuous primitive sequence more than 3 is just thought effective primitive sequence;
2, idle (IDLE) primitive signal;
3, other part primitive signals; As the link reset signal (Link reset, LR), the link reset response signal (Link reset response, LRR), can not operate primitive sequence (Not OperationalPrimitive Sequence; NOS), ring topology arbitrating signals (arbitrate; ARB), off-lined signal (Offine Signal, OLS), the loop initialization signal (Loop initialization, LIP) etc.;
4, the still undefined at present primitive signal of FC agreement, FC agreement regulation needs backward compatibility, and the person of satisfying condition can carry out rate adapted.
Rate adaption method commonly used at present is to do a tabulation to being used for carrying out adaptive primitive in the FC agreement; Compare one by one receiving the FC signal; When finding is the signal that can be used for carrying out rate adapted; As the adaptive primitive signal that can carry out has LR, LRR, NOS, OLS, ARB etc., and current needs then insert or delete this signal when carrying out rate adapted.GFPT equipment need be done a tabulation with the characteristic of all these signals, and whether when receiving a FC signal, comparing judgement one by one is a kind of signal that belongs to wherein, if then can carry out the rate adapted operation.
Shown in Figure 3 for carry out the handling process of rate adapted according to prior art, comprise the steps:
Step 301: input FC signal.
Step 302: judge whether primitive,, otherwise do not carry out adaptation processing, can go to step 401 if then execution in step 303 into FC.
Step 303: judge whether primitive into IDLE, if, then carry out the IDLE adaptation processing, can go to step 401; Otherwise execution in step 304.
Step 304: judge whether to be NOS, if, then carry out the NOS adaptation processing, can go to step 401; Otherwise execution in step 305.
Step 305: judge whether primitive into LR, if, then carry out the LR adaptation processing, can go to step 401; Otherwise execution in step 306.
Step 306: judge whether into other can adaptive primitive, if, then carry out corresponding adaptation processing, can go to step 401; Otherwise do not carry out adaptation processing.The order of above-mentioned steps 304 and step 305 can be put upside down.According to the primitive number of can be adaptive enumerating in the primitive tabulation of GFPT equipment, this step also possibly comprise a plurality of judgements and corresponding adaptation processes.
The inventor finds in research process:
1, realizes complicacy,, judge whether certain signal can be used for carrying out the signal of rate adapted, then need compare one by one, cause realizing complicacy, take more resource because the signal of stipulating in the FC agreement that can be used for rate adapted is many.
2, can't accomplish well that the back is to protocol compatibility.Because the development of FC agreement, follow-up the new signal that can be used for rate adapted possibly appear, and we can't undetermined primitive like this, thereby cause and can't discern.
Summary of the invention
In view of this, the embodiment of the invention proposes a kind of rate adaption method, can simplify the rate adapted process.This method comprises:
Receive optical-fibre channel FC signal, identification primitive signal in the FC signal that is received;
Identical primitive signal to occurring continuously in the said FC signal is added up, if said number of times reaches pre-set threshold, then said FC signal is carried out rate adapted and handles.
The embodiment of the invention also proposes a kind of rate adapted device, comprising: the primitive identification module, be used to receive the FC signal, and if from said FC signal, identify the primitive signal, then export said FC signal;
The number of times statistical module; Be used to receive the said FC signal that said primitive identification module sends; Identical primitive signal to occurring continuously in the said FC signal is added up, and reaches pre-set threshold if the number of times of consecutive identical primitive signal occurs, then exports said FC signal;
The adaptation processing module is used to receive the said FC signal that said number of times statistical module sends, and said FC signal is carried out rate adapted handle.
The present invention also proposes a kind of GFPT equipment; Comprise Physical Coding Sublayer PCS processing unit and 64B/65B decoding unit; Said GFPT equipment also comprises the rate adapted device, is used to receive the 8B/10B character code from the 64B/65B decoding unit, from said 8B/10B character code, identifies the primitive signal; Judge whether the number of times that said primitive signal occurs continuously reaches pre-set threshold; If, then said character code is carried out rate adapted and handle according to said primitive signal, export the character code after the adaptation processing to said PCS processing unit then.
Can find out from above technical scheme; Technical scheme of the present invention is not discerned the primitive in the FC signal particularly; And through differentiating the continuous number of repetition of primitive signal; And carry out rate adapted in view of the above and handle, simplified the discriminant approach that can carry out the rate adapted signal, greatly reduce the complexity that realizes.And,, support the expansion of FC agreement in the future well because this processing procedure does not relate to the classification of concrete primitive signal is judged.
Description of drawings
Fig. 1 is FC equipment and GFPT equipment connecting relation sketch map;
Fig. 2 is a GFPT device interior processing module block diagram;
Fig. 3 carries out the process chart of rate adapted for prior art;
Fig. 4 carries out the process chart of rate adapted for first embodiment of the invention;
Fig. 5 be the rate adapted device of first embodiment of the invention in GFPT equipment with the annexation sketch map of existing module;
Fig. 6 is the inter-process block diagram of the rate adapted device of first embodiment of the invention;
Fig. 7 carries out the process chart of rate adapted for second embodiment of the invention;
Fig. 8 is the inter-process block diagram of the rate adapted device of second embodiment of the invention.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, the present invention is done further to set forth in detail below in conjunction with accompanying drawing.
The rate adapted mode that first embodiment of the invention adopts is following:
From the FC signal, identify the primitive signal; Continuous occurrence number to identical primitive is added up, for example, if the number of times that occurs continuously reaches the threshold value that is provided with in advance; For example threshold value is set to 3; Promptly think to carry out the primitive of rate adapted, can after the 3rd identical primitive signal, insert at least one primitive signal identical with this primitive signal; Perhaps, after the 3rd identical primitive signal, delete the primitive signal of at least one primitive signal identical with this primitive signal.Wherein, be that criterion is a kind of customary setting with 3 primitive signals of continuous appearance, the number that in fact also can occur identical primitive signal continuously is set to other and is worth and judges.
With 3 primitive signals of continuous appearance is that criterion is an example, and the rate adapted handling process of the embodiment of the invention is as shown in Figure 4, comprises the steps:
Step 401: input FC signal.
Step 402: judge whether primitive,, otherwise do not carry out adaptation processing, can go to step 401 if then execution in step 403 into FC.
Step 403: to the number of repetition statistics of this primitive signal;
Step 404: judge whether this primitive signal occurs 3 times continuously, if not, then do not carry out adaptation processing, can go to step 401; If then execution in step 405.
Step 405: but with this primitive signal as adaptation signal, the scanning frequency of going forward side by side rate adaptation processing.Delete adaptively if desired, can after the 3rd continuous primitive signal, delete at least one primitive signal identical with this primitive signal; If need insertion adaptive, then can after the 3rd continuous primitive signal, insert at least one primitive signal identical with this primitive signal.
The GFPT equipment of first embodiment of the invention is as shown in Figure 5, and GFPT apparatus in comparison shown in Figure 2 increases a rate adapted device between 64B/65B decoding unit 208 and PCS processing unit 202; Be used to receive 8B/10B character code from 64B/65B decoding unit 208; From this character code, identify the primitive signal, judge whether this primitive signal occurs pre-set threshold continuously, for example 3 times; If; Delete adaptively if desired, then can after the 3rd continuous primitive signal, delete at least one primitive signal identical with this primitive signal; If need insertion adaptive, then can after the 3rd continuous primitive signal, insert at least one primitive signal identical with this primitive signal, export the signal after the adaptation processing to PCS processing unit 202 then.
The inter-process block diagram of this rate adapted device of first embodiment of the invention is as shown in Figure 6, comprising:
Number of times statistical module 602; Be used for the identical primitive signal that the character code of being received occurs is continuously added up; If continuous 3 identical primitive signals occur; Then export said character code to adaptation processing module 603, if the number of times that identical primitive signal occurs continuously is less than 3, then with the output signal of said character code as the rate adapted device.
Comprise in the number of times statistical module 602: counter, be used for the occurrence number of identical primitive signal of the character code of input is counted, counting rule is following:
Initial value is 0; Occur a primitive signal then count value become 1, if the primitive signal identical with previous primitive signal occur, then count value adds 1, if the appearance primitive signal different with previous primitive signal, then count value clear 0;
Judge submodule, be used for the count value of said counter is judged, if count value more than or equal to 3, then exports said character code to adaptation processing module 603, otherwise, directly export the output signal of said character code as the rate adapted device.
Because IDLE primitive is used to represent idle condition; Itself does not carry effective information; Being fit to carry out rate adapted more than other primitive handles; Therefore propose second embodiment of the invention again, carry out independent adaptation processing, then adopt the mode of similar first embodiment to handle for other primitive for the IDLE primitive that identifies.
Be that criterion is an example with 3 primitive signals of continuous appearance still, the handling process of second embodiment is as shown in Figure 7, comprises the steps:
Step 701: input FC signal.
Step 702: judge whether primitive,, otherwise do not carry out adaptation processing, can go to step 701 if then execution in step 703 into FC.
Step 703: judge whether primitive into IDLE, if, then carry out IDLE adaptation processing and process ends, otherwise execution in step 704.The IDLE adaptation processing can be after the 3rd continuous IDLE signal, deletes at least one IDLE signal or inserts at least one IDLE signal.
Step 704: to the number of repetition statistics of this primitive signal;
Step 705: judging that the number of times whether this primitive signal occurs continuously reaches the threshold value that is provided with in advance, for example is 3 times, if not, does not then carry out adaptation processing, can go to step 701; If then execution in step 706.
Step 706: but with this primitive signal as adaptation signal, the scanning frequency of going forward side by side rate adaptation processing.Delete adaptively if desired, then can after the 3rd continuous primitive signal, delete at least one primitive signal identical with this primitive signal; If need insertion adaptive, then can after the 3rd continuous primitive signal, insert at least one primitive signal identical with this primitive signal.
The inter-process block diagram of the rate adapted device of second embodiment of the invention is as shown in Figure 8, comprising:
IDLE adaptation processing module 802; Being used for that the character code of being received that contains IDLE is carried out rate adapted handles; Can be after the 3rd continuous IDLE signal; Delete at least one IDLE signal or insert at least one IDLE signal, and the character code after will handling is as the output signal of rate adapted device.
Number of times statistical module 803; Be used for the identical primitive signal that the character code of being received occurs is continuously added up; If continuous 3 identical primitive signals occur; Then export said character code to adaptation processing module 804, if the number of times that identical primitive signal occurs is less than 3, then with the output signal of said character code as the rate adapted device.
Comprise in the number of times statistical module 803: counter, be used for the occurrence number of identical primitive signal of the character code of input is counted, counting rule is following:
Initial value is 0; Occur a primitive signal then count value become 1, if the primitive signal identical with previous primitive signal occur, then count value adds 1, if the appearance primitive signal different with previous primitive signal, then count value clear 0;
Judge submodule, be used for the count value of said counter is judged, if count value more than or equal to 3, then exports said character code to adaptation processing module 804, otherwise, directly export the output signal of said character code as the rate adapted device.
Technical scheme of the present invention is not discerned the primitive in the FC signal particularly; And through differentiating the continuous number of repetition of primitive signal; And carry out rate adapted in view of the above and handle, simplified the discriminant approach that can carry out the rate adapted signal, greatly reduce the complexity that realizes.And,, support the expansion of FC agreement in the future well because this processing procedure does not relate to the classification of concrete primitive signal is judged.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (15)
1. a rate adaption method is characterized in that, this method comprises:
Receive optical-fibre channel FC signal, judge whether said FC signal is the primitive signal,, otherwise repeat this step if carry out next step;
To the number of repetition of this primitive signal statistics, judge that the number of times whether this primitive signal occurs continuously reaches the threshold value that is provided with in advance, if said number of times reaches pre-set threshold, but then with this primitive signal as adaptation signal, the scanning frequency of going forward side by side rate adaptation processing.
2. method according to claim 1 is characterized in that, before the said number of repetition statistics to this primitive signal, further comprises; Judge whether said primitive signal is idle IDLE primitive signal, if, but then with said IDLE primitive signal as adaptation signal, the scanning frequency of going forward side by side rate adaptation processing, otherwise, carry out said subsequent step.
3. method according to claim 1 is characterized in that, said threshold value is 3.
4. method according to claim 3; It is characterized in that; But said then with this primitive signal as adaptation signal, the scanning frequency of going forward side by side rate adaptation processing comprises: after the 3rd identical primitive signal, delete at least one primitive signal identical with said primitive signal; Perhaps, after the 3rd identical primitive signal, insert at least one primitive signal identical with said primitive signal.
5. according to each described method of claim 1 to 4, it is characterized in that said FC signal is the 8B/10B character code with the output of the 64B/65B decoding unit in the frame-forming protocol transparent mode GFPT equipment.
6. a rate adapted device is characterized in that, comprising:
The primitive identification module is used to receive the FC signal, judges whether said FC signal is the primitive signal, if then export said primitive signal;
The number of times statistical module is used to receive the said primitive signal that said primitive identification module sends, and to the number of repetition statistics of this primitive signal, judges that the number of times whether this primitive signal occurs continuously reaches the threshold value that is provided with in advance, if then export said primitive signal;
The adaptation processing module is used to receive the said primitive signal that said number of times statistical module sends, but with this primitive signal as adaptation signal, the scanning frequency of going forward side by side rate adaptation processing.
7. rate adapted device according to claim 6 is characterized in that, said rate adapted device further comprises:
IDLE adaptation processing module is used for that the FC signal that contains IDLE that receives is carried out rate adapted and handles;
Then said primitive identification module further comprises:
Primitive signal recognin module is used to receive said FC signal, judges whether said FC signal is the primitive signal, if then export said primitive signal;
IDLE primitive recognin module; Be used to receive the said primitive signal that said primary signal recognin module is sent; If said primitive signal is an IDLE primitive, then exports said IDLE primitive to said IDLE adaptation processing module, otherwise export said primitive signal to said number of times statistical module.
8. rate adapted device according to claim 6 is characterized in that, said number of times statistical module comprises:
Counter is used for the continuous occurrence number of the identical primitive signal that receives is counted;
Judge submodule, be used for the count value of said counter is judged, if count value then exports said primitive signal to said adaptation processing module more than or equal to the threshold value that is provided with in advance.
9. rate adapted device according to claim 8 is characterized in that, said counter is counted according to following rule:
Initial value is 0; Occur a primitive signal then count value become 1, if the primitive signal identical with previous primitive signal occur, then count value adds 1, if the appearance primitive signal different with previous primitive signal, then count value clear 0.
10. according to each described rate adapted device of claim 6 to 9; It is characterized in that; Said adaptation processing module is used for: if said threshold value is N; Then said adaptation processing module is used for after N identical primitive signal, deleting at least one primitive signal identical with said primitive signal; And/or, after N identical primitive signal, insert at least one primitive signal identical with said primitive signal; And the FC signal after the output processing.
11. a GFPT equipment comprises Physical Coding Sublayer PCS processing unit and 64B/65B decoding unit, it is characterized in that; Said GFPT equipment also comprises the rate adapted device, is used to receive the 8B/10B character code from the 64B/65B decoding unit, judges in the said 8B/10B character code whether comprise the primitive signal; If; To the number of repetition statistics of this primitive signal, judge whether the number of times that said primitive signal occurs continuously reaches pre-set threshold, if; Then said character code is carried out rate adapted and handle, export the character code after the adaptation processing to said PCS processing unit then according to said primitive signal.
12., it is characterized in that said rate adapted device comprises according to the said GFPT equipment of claim 11:
The primitive identification module is used to receive the FC signal, judges whether said FC signal is the primitive signal, if then export said primitive signal;
The number of times statistical module is used to receive the said primitive signal that said primitive identification module sends, and to the number of repetition statistics of this primitive signal, judges that the number of times whether this primitive signal occurs continuously reaches the threshold value that is provided with in advance, if then export said primitive signal;
The adaptation processing module is used to receive the said primitive signal that said number of times statistical module sends, but with this primitive signal as adaptation signal, the scanning frequency of going forward side by side rate adaptation processing.
13. GFPT equipment according to claim 12 is characterized in that, said rate adapted device further comprises:
IDLE adaptation processing module is used for that the FC signal that contains IDLE that receives is carried out rate adapted and handles;
Then said primitive identification module further comprises:
Primitive signal recognin module is used to receive said FC signal, judges whether said FC signal is the primitive signal, if then export said primitive signal;
IDLE primitive recognin module; Be used to receive the said primitive signal that said primary signal recognin module is sent; If said primitive signal is an IDLE primitive; Then export said IDLE primitive to said IDLE adaptation processing module, otherwise then export said primitive signal to said number of times statistical module.
14. GFPT equipment according to claim 12 is characterized in that, said number of times statistical module comprises:
Counter is used for the continuous occurrence number of the identical primitive signal that receives is counted;
Judge submodule, be used for the count value of said counter is judged, if count value then exports said primitive signal to said adaptation processing module more than or equal to the threshold value that is provided with in advance.
15. according to claim 12,13 or 14 described GFPT equipment; It is characterized in that; Said adaptation processing module is used for: if said threshold value is N, then said adaptation processing module is used for after N identical primitive signal, deleting at least one primitive signal identical with said primitive signal; And/or, after N identical primitive signal, insert at least one primitive signal identical with said primitive signal; And the FC signal after the output processing.
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| CN101938311B (en) * | 2009-07-02 | 2013-11-06 | 中兴通讯股份有限公司 | Method and device for compressing or decompressing data in fiber channel business |
| ES2645246T3 (en) * | 2012-12-18 | 2017-12-04 | Huawei Technologies Co., Ltd. | Method, system and communication device for optical network system |
| CN106411454B (en) * | 2015-07-30 | 2019-10-25 | 华为技术有限公司 | Method, transmitter and receiver for data transmission |
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| CN1921445A (en) * | 2005-08-26 | 2007-02-28 | 华为技术有限公司 | Method for transmitting FC frame and package exchanging network and its node using the method |
| CN1968187A (en) * | 2006-09-27 | 2007-05-23 | 华为技术有限公司 | Data rate adaptation method and apparatus |
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| CN1921445A (en) * | 2005-08-26 | 2007-02-28 | 华为技术有限公司 | Method for transmitting FC frame and package exchanging network and its node using the method |
| CN1968187A (en) * | 2006-09-27 | 2007-05-23 | 华为技术有限公司 | Data rate adaptation method and apparatus |
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