CN101299649A - Method and device for mixing and concourse of multi-service based on all-purpose framing regulations - Google Patents
Method and device for mixing and concourse of multi-service based on all-purpose framing regulations Download PDFInfo
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Abstract
A multiple service mix concourse method based on universal frame forming regulations includes: executing alignment, in-frame and decoding operations to the SONET/SDH service or data service code stream, extracting the service data and caching; circularly enquiring each service duct in sequence, executing velocity regulation to the data required to transmit, and extracting the duct identification information; executing GFP encapsulating operation to the service data stream after packaging, and using the CID in the GFP spreading frame head to differentiate the duct identifications; putting the service data stream after packaging in the net load OPUk of the OPUk, and executing the stuffing of the OTN spending to form the OTN signals; executing frame decoding to the OTN signals for decoding the OPUk net load; de-packaging the GFP to obtain the duct identification and data; outputting the data in the corresponding GFP net load to the service transmission buffer; regenerating the SONET/SDH transmission clock, and transmitting the SONET/SDH service or data services. The invention can realize direct conveying of low speed SONET/SDH service signals in the OTN signals, and fully utilizes the band-width resources.
Description
Technical field
The present invention relates to the optical transfer network technical field, in particular, is a kind of mixing and concourse of multi-service method and apparatus based on Generic Framing Procedure (GFP, Generic Framing Procedure).
Background technology
Along with transmission network by the differentiation of SONET/SDH (Synchronous Optical Network/SynchronousDigital Hierarchy) to optical transfer network OTN (Optical Transport Network), various client's business needs are encapsulated among the OTN and transmit, therefore various client's side business all will at first be mapped to OTN, transmit in transmitting net then.ITU-T G.709 in, stipulated other light path data cell of three kinds of different rates levels ODUk (Optical Channel Data Unit-k, k=1,2,3), correspond respectively to about 2.6Gbps, 10.7Gbps the speed of 43Gbps is used for the encapsulation of different client's business.Common client's side business mainly contains two big classes, and a class is based on the data service (as GE, FC etc.) of bag, and a class is based on the SONET/SDH business of TDM.
For the encapsulation of data service to OTN, the bandwidth of common data services all much smaller than the bandwidth (the about 2.5Gbps of payload speed of ODU1) of ODUk, so generally all be that multichannel data is professional through multiplexing being encapsulated among the ODUk, generally has three kinds of modes:
Mode one: data service is mapped among VC4-Xc or the VC4-Xv by GFP-T (Transparent GFP)/GFP-F (Frame-mappedGFP) encapsulation, is multiplexed into STM-16 or STM-64, is encapsulated among the ODUk synchronously again.
Mode two: data service is mapped in the different time-gap of ODUk by the GFP-T/F encapsulation, has simplified the encapsulation level.
Mode three: multichannel data is professional to be mapped in the payload of whole ODUk by GFP-T/F (distinguishing passage by CID) encapsulation and adjustment speed.
For traditional SONET/SDH business, direct synchronization map then, but because the minimal data unit is ODU1 among the OTN, only can support the mapping of STM-16/STM-64, for a large amount of STM-1/STM-4 (or STS-3 at net, the SDH business of low rate such as STS-12), then can't directly shine upon, can only be earlier with STM-1/STM-4 (or STS-3, STS-12) converge to STM-16 or STM-64, and then be encapsulated among the OTN and transmit, this is for the OTN product, increase multiplexing mapping path, improved equipment cost.
And along with the sharp increase of data service, the mixing in OTN of data service and SDH business transmits and also can only divide different access units to realize the waste of the wavelength resource that causes.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method of SONET/SDH and the data service mixing and concourse based on GFP, transmits so that SONET/SDH can be blended in the OTN network with data service.
In order to address the above problem, the invention provides a kind of mixing and concourse of multi-service device based on Generic Framing Procedure, this device comprises that service access processing unit, Multiplexing Unit, GFP encapsulation unit, OTN become frame unit, OTN to separate frame unit, GFP decapsulation unit and the professional processing unit that sends, wherein
The service access processing unit is used for the SONET/SDH business code flow or the data code flow of each passage of client's side are alignd, and decides frame or decoding, and extracts business datum and buffer memory;
Multiplexing Unit is used for the buffer memory of each service channel of cyclic query successively, need to judge whether the data of transmission, if have then data carried out the speed adjustment, extract the gap marker information of data, send to the GFP encapsulation unit, if do not have then the next passage of poll together with data.
The GFP encapsulation unit is used for that the business data flow after multiplexing is carried out GFP and seals and operate, and distinguishes gap marker with the CID in the GFP expansion frame head;
OTN becomes frame unit, is used for the output of GFP encapsulation unit is put into the payload OPUk of ODUk, and finishes the filling of OTN expense, forms complete OTN frame signal;
OTN separates frame unit, be used to finish circuit the OTN signal separate frame operation, the OPUk payload that solves;
The GFP decapsulation unit is used for GFP is carried out decapsulation, parses gap marker and data;
Demultiplexing unit, the CID gap marker that decapsulation parses according to GFP outputs to the data in the corresponding GFP payload in the corresponding business transmitting element;
Business sends processing unit, is used for the data of buffer memory GFP payload, the professional tranmitting data register of regeneration SONET/SDH and transmission SONET/SDH business and data service.
Further, described service access processing unit comprises that some SONET/SDH service accesses are handled subelement and the plurality of data service access is handled subelement, the described professional processing unit that sends comprises that subelement is handled in the professional transmission of some SONET/SDH and professional transmission of plurality of data handled subelement, wherein, the corresponding service access of each SONET/SDH business code flow or data code flow is handled subelement and the professional processing subelement that sends.
Further, the GFP encapsulation unit is to SONET/SDH when professional, with the SONET/SDH signal by row or after dividing frame by frame, be encapsulated into the GFP-F frame, or the SONET/SDH signal is carried out 64B/65B encode, be encapsulated into superblock SuperBlock again, enclose the GFP-T frame at last.
Further, described Multiplexing Unit also is used for extracting and Client Signal Fail CSF information, described GFP encapsulation unit also is used for producing the GFP management frames according to CSF information, be responsible for the transmission of the professional failure state CSF of client's side mapping, described decapsulation unit also is used to resolve CSF information, and described service transmitting unit also is used for doing corresponding crash handling according to CSF information industry on corresponding passage.
Further, if the clock of GFP encapsulation back sending direction becomes the speed of frame unit different with OTN, described GFP encapsulation unit also is used for filling the GFP idle frame at the GFP Frame, and described GFP decapsulation unit also is used to delete idle frame.
Further, described service access processing unit and the described professional processing unit that sends adopt first in first out buffer FIFO to carry out metadata cache, the described professional processing unit that sends also comprises voltage controlled oscillator VCO, said professional transmission processing unit is used for controlling voltage controlled oscillator VCO according to the empty full state of the FIFO of the professional direction to be sent of SONET/SDF and produces tranmitting data register, thus realization SONET/SDH clock regeneration.
Further, the described professional processing unit that sends comprises that also low pass filter is used for the signal that voltage controlled oscillator produces is carried out filtering and level and smooth.
For solving the problems of the technologies described above, the present invention also provides a kind of mixing and concourse of multi-service method based on Generic Framing Procedure, and this method may further comprise the steps:
(a) SONET/SDH business code flow or the data service code stream to each passage of client's side aligns, and decides frame or decode operation, extracts business datum and buffer memory;
(b) each service channel of cyclic query successively need to judge whether the data that send, if having then data are carried out the speed adjustment, extracts the gap marker information of data, and changes execution in step c, otherwise the next passage of poll;
(c) business data flow after multiplexing is carried out the GFP encapsulating operation, distinguish gap marker with the CID in the GFP expansion frame head;
(d) data flow after will encapsulating is put into the payload OPUk of ODUk, and carries out the filling of OTN expense, forms complete OTN frame signal;
(e) the OTN signal is separated frame, solve the OPUk payload;
(f) GFP is carried out decapsulation, parse gap marker and data;
(g), the data in the corresponding GFP payload are outputed in the corresponding business transmission buffer according to gap marker;
(h) the professional tranmitting data register of regeneration SONET/SDH, and send SONET/SDH business and data service.
Further, in the step (c), when encapsulating for the SONET/SDH business, the SONET/SDH signal by row or divide frame by frame, is encapsulated into the GFP-F frame then, or after the SONET/SDH signal carried out 64B/65B coding, be encapsulated into superblock again, enclose the GFP-T frame at last.
Further, if the clock of GFP encapsulation back sending direction becomes the speed of frame unit different with OTN, then in the GFP Frame, intert the GFP idle frame in the step (c), during to the decapsulation of GFP data, delete idle frame in the step (f).
Further, step (b) also comprises the Client Signal Fail information of extracting when multiplexing, when carrying out the GFP encapsulation in the step (c), produce the GFP management frames according to client's fail message, step (f) is during to the GFP decapsulation, also comprise the CSF information that parses, also comprise according to client's fail message in the step (h) and carry out corresponding crash handling, carry out the failure state transmission.
Further, step (a) and (f) in adopt first in first out buffer FIFO to carry out metadata cache, control voltage controlled oscillator VCO according to the empty full state of the FIFO of the professional direction to be sent of SONET/SDF in the step (f) and produce tranmitting data register, thereby realize the SONET/SDH clock regeneration.
Further, the signal that utilizes low pass filter that voltage controlled oscillator is produced in the step (f) carries out filtering and level and smooth, to produce the stable clock signal.
Compared with prior art, the present invention directly is encapsulated into the SONET/SDH service signal one of GFP and data service and transmits, can realize directly in the OTN network, transmitting the SONET/SDH service signal of low speed, make full use of bandwidth resources, and can realize the transparent transmission of all low speed SONET/SDH business clocks.
Description of drawings
Fig. 1 is the mixing and concourse of multi-service schematic representation of apparatus that the present invention is based on Generic Framing Procedure.
Fig. 2 is another schematic diagram that the present invention is based on the mixing and concourse of multi-service device of Generic Framing Procedure.
Fig. 3 is the schematic diagram that the present invention is based on the mixing and concourse of multi-service application example 1 of Generic Framing Procedure.
Fig. 4 is the schematic diagram that the inventive method encapsulates in the GFP-F mode frame by frame to the SONET/SDH business.
Fig. 5 is the schematic diagram that the inventive method encapsulates by row in the GFP-F mode the SONET/SDH business.
Fig. 6 is the schematic diagram that the present invention is based on the mixing and concourse of multi-service application example 2 of Generic Framing Procedure.
Embodiment
As depicted in figs. 1 and 2, the present invention adopts the third multiplexer mode, and SONET/SDH and data service are carried out GFP encapsulation and multiplexing, the present invention includes with lower unit:
Service access processing unit: be used for the SONET/SDH business code flow or the data code flow of each passage of client's side are alignd, decide frame or decoding, and extract business datum and buffer memory;
The service access processing unit comprises that several SONET/SDH service accesses are handled subelement and data service inserts the processing subelement, wherein,
The SONET/SDH service access is handled subelement (replacing SONET/SDH with SDH among the figure): the SONET/SDH business code flow that is used for being responsible for client's side aligns, and decides the frame operation, extracts the professional and buffer memory of SONET/SDH.
Data service inserts handles subelement: the data service code stream that is used for being responsible for client's side aligns, 8B10B decoding (or 4B5B decoding), and extract data service and buffer memory.
Wherein, the corresponding service access of each SONET/SDH business code flow or data service code stream is handled subelement.
Multiplexing Unit: the buffer memory of each service channel of cyclic query (m SONET/SDH passage and n data service channel) successively, need to judge whether the data of transmission, if have then data carried out the speed adjustment, extract the gap marker information and the Client Signal Fail information of data, send to the GFP encapsulation unit together with data, if do not have then the next passage of poll.
The client signal state can be divided into 3 kinds, and a link normally has data, the normal free of data of b link, but normal management control signaling is arranged, and the c service disconnection, what does not all have.When c took place, Multiplexing Unit was designated CSF and sends to the GFP encapsulation unit, carries out normal subsequent operation, and this information passes to the demultiplexing unit of opposite end always, and then operated (such as turn-offing laser) accordingly)
Gap marker is used to identify former business code flow channel number, so that the data that mix can be distributed to original passage according to gap marker when demultiplexing.
The GFP encapsulation unit: the GFP that the GFP encapsulation unit is finished the business data flow after multiplexing seals and operates, and distinguishes gap marker with the CID in the GFP expansion frame head.
Below introduce concrete method for packing
For data service, the description in G.7041 encapsulates according to ITU-T.
For the SONET/SDH business, during the GFP-F pattern, the SONET/SDH signal by going or dividing frame by frame, is encapsulated into the GFP-F frame then.
During the GFP-T pattern, the SONET/SDH signal is carried out the 64B/65B coding, and then be encapsulated into SuperBlock, enclose the GFP-T frame at last.
The GFP encapsulation unit also produces the GFP management frames according to CSF information, be responsible for the professional failure state (CSF of client's side mapping, Client Signal Fail) transmission, for the SONET/SDH business, failure state comprises dropout and LOF, for data service, failure state comprises dropout and synchronization loss.
Because the clock of GFP encapsulation back sending direction becomes the speed possibility of frame unit different with OTN, so the GFP encapsulation unit will be filled the GFP idle frame according to standard code in the GFP Frame.
OTN becomes frame unit: OTN to become frame unit that the payload OPUk of ODUk is put in the output of GFP encapsulation unit, and finishes the filling of OTN expense, forms complete OTN frame signal.
OTN separates frame unit: the frame of separating of finishing the OTN signal of circuit is operated, and the OPUk payload that solves is given next step and carried out the GFP decapsulation.
GFP decapsulation unit: carry out the anti-process of GFP encapsulation unit, GFP is carried out decapsulation, parse gap marker, data and CSF information and give demultiplexing unit and delete idle frame.
Demultiplexing unit: be used for CID gap marker, the data in the corresponding GFP payload are outputed in the corresponding business transmitting element buffer according to the output of GFP decapsulation unit.
The professional processing unit that sends: the data that are used for buffer memory GFP payload kind, the professional tranmitting data register of regeneration SONET/SDH, transmission SONET/SDH business and data service, and transmission failure state, this unit comprises professional processing subelement and the data service transmission processing subelement of sending of some SONET/SDH, wherein
The SONET/SDH business sends handles subelement (replacing SONET/SDH with SDH among the figure): finish the transmission of the regeneration of the professional tranmitting data register of SONET/SDH, professional transmission and failure state.
Service access processing unit and the professional processing unit that sends adopt FIFO to carry out metadata cache, in order to realize the regeneration of the professional tranmitting data register of SONET/SDH, it is the transparent transmission of business clock, earlier from SONET/SDH data flow to be sent, extract clock, control VCO (Voltage Controlled Oscillator voltage controlled oscillator) according to the empty full state of the FIFO of the professional direction to be sent of SONET/SDF and produce tranmitting data register, the clock of SONET/SDH can be realized regeneration in this case, and the clock frequency and the SONET/SDH streaming rate of regeneration adapt.
For the more stable employing of the clock signal that makes generation LPF low pass filter carries out filtering and level and smooth to the output signal of VCO, be used for filtering because the variation of data and of the influence of other destabilizing factors to clock signal.
Data service sends handles subelement: finish the transmission of data service and the transmission of failure state.
Wherein, corresponding professional transmission of each SONET/SDH business code flow or data code flow is handled subelement.If the GFP management frames were arranged on corresponding passage service transmitting unit do corresponding crash handling.
The mixing and concourse of multi-service method that the present invention is based on Generic Framing Procedure may further comprise the steps:
Step 1: SONET/SDH business code flow or data code flow to each passage of client's side align, and decide frame or decode operation, extract business datum and buffer memory;
Step 2: each service channel of cyclic query successively, need to judge whether the data that send, if having then data are carried out the speed adjustment, extract the gap marker information and the Client Signal Fail information of data, and change execution in step three, otherwise the next passage of poll;
Step 3: the business data flow after multiplexing is carried out the GFP encapsulating operation, and distinguish gap marker with the CID in the GFP expansion frame head;
For data service, the description in G.7041 encapsulates according to ITU-T.
For the SONET/SDH business, during the GFP-F pattern, the SONET/SDH signal by going or dividing frame by frame, is encapsulated into the GFP-F frame then.During the GFP-T pattern, the SONET/SDH signal is carried out the 64B/65B coding, and then be encapsulated into SuperBlock, enclose the GFP-T frame at last.
Because the clock of GFP encapsulation back sending direction becomes the speed possibility of frame unit different with OTN, so will in the GFP Frame, intert the GFP idle frame.The GFP encapsulation unit also produces the GFP management frames simultaneously, be responsible for the professional failure state (CSF of client's side mapping, C1ient Signal Fail) transmission, for the SONET/SDH business, failure state comprises dropout and LOF, for data service, failure state comprises dropout and synchronization loss.
Step 4: the data flow after will encapsulating is put into the payload OPUk of ODUk, and carries out the filling of OTN expense, forms complete OTN frame signal;
Step 5: the OTN signal is separated frame, solve the OPUk payload;
Step 6: GFP is carried out decapsulation, parses gap marker, data and CSF information, the deletion idle frame, and if the GFP management frames were arranged on corresponding passage service transmitting unit do corresponding crash handling;
Step 7:, the data in the corresponding GFP payload are outputed in the corresponding business transmission buffer according to the CID gap marker;
Step 8: the professional tranmitting data register of regeneration SONET/SDH, and send SONET/SDH business and data service, transmit failure state.
Below in conjunction with accompanying drawing, the enforcement to technical scheme is further described for example.
Because be mapped into SONET/SDH behind the GFP and the data service encapsulation after GFP similar, so GFP also has three kinds of modes with data service is similar to the mapping that transmits net, giving an example below is example in above-mentioned mode three all.The encapsulation of OTN is example with OTU1, and is example with the STM-1 of a plurality of passages or STM-4 and data service hybrid package to GFP.
And SONET/SDH also has GFP-F and GFP-T dual mode to the encapsulation of GFP, below by different application example introductions.
Application example 1:
One road STM-1 and two-way GE business converge to OTU1 with the GFP-F encapsulation.
As shown in Figure 3, insert the business of three passages altogether, passage 1 is the professional STM-1 of low speed SONET/SDH, and passage 2 and passage 3 are data service GE, and present embodiment adopts the GFP-F encapsulation.
In the Add direction, for the GE business, in GE service access processing unit, the 10B code stream of serial is separated the sign indicating number into 8B, remove lead code and frame delimiter, increase frame head postamble indication (i.e. alignment, decoding, and extraction data) send first-in first-out buffer FIFO (First In First Out) after, for the STM-N business, owing to there is not physical layer encodes, therefore need not decoding, the words that the expense of SONET/SDH is detected just need be carried out descrambling code if desired, do the Performance Detection of non-intervention, directly frame data are increased frame head postamble indication (i.e. alignment then, decide frame operation, extract the process of SONET/SDH business) output to FIFO.
Multiplexing Unit is the data that each passage FIFO of poll sends here, adds that gap marker can be sent to the GFP-F encapsulation unit and encapsulate after collecting a frame.
GFP-F encapsulation to GE be encapsulated in ITU-T G.7041 in existing the description, can similarly encapsulate for SONET/SDH, as shown in Figure 4, with the frame structure of STM-1 from left to right, order is encapsulated in the payload of GFP from top to bottom.Because the every frame 125us of SONET/SDH, if whole frame encapsulation can cause bigger time-delay, can realize by SONET/SDH is packaged into GFP-F by row or littler particle, encapsulation as shown in Figure 5 line by line, promptly the frame of putting into a payload originally, divide 9 row to put into 9 payloads simultaneously, to reduce the encapsulation time-delay, time-delay is about 14us for 125us/9 only like this.Data service oversized frame (professional 9600 bytes of GE are equivalent to 96us) also can cause the time-delay of SONET/SDH bigger, and this also is the shortcoming of GFP-F encapsulation.
The GFP-F encapsulation unit according to CSF (Client Signal Fail, the Client SingalFail) indication of each passage, is finished the transmission of CSF management frames simultaneously.
GFP adopts synchronous process to the mapping of OTU1, when the speed of GFP is lower than OTU1 payload OPU1, adopts the GFP idle frame to fill.
Carry out opposite process in the Drop direction, it should be noted that working as the Drop direction TSF (TrailSignal Fail occurs, the trace Signal Fail), SSF (Server Signal Failure, service signal lost efficacy) or the CSF (Client Signal Fail) of certain passage when waiting inefficacy, GFP can export the PN11 sign indicating number downwards, so that there is stable light source the rear end and can detects failure state.
At Drop side sending direction, can adopt local clock to send for GE, realize the adaptive of speed at interval by adjusting IPG (Interpackage Gap inter-packet gap), for the SONET/SDH business, prior art is to adopt circuit or local clock to send, rate-matched realizes by the pointer adjustment, realize comparatively complicated, and the SONET/SDH clock is transparent transmission not, the inventive method is to extract clock from SONET/SDH data flow to be sent, just control VCO (Voltage Controlled Oscillator voltage controlled oscillator) with the empty full state of the FIFO of 1 sending direction of passage among Fig. 2 and produce tranmitting data register, the clock of SONET/SDH can be realized transparent transmission (being clock regeneration) in this case.
The speed of STM-1 is 155.52Mbps in this example, carrying out by the speed after the row GFP-F encapsulation is 163.584Mbps (155.52 * (2+2+2+2+2+2+2+270)/270), the payload speed of two-way GE respectively is 1Gbps, the short bag minimum according to packaging efficiency calculates, speed after the encapsulation is 975Mbps (1000 * (64+2+2+2+2+2+2+2)/(64+8+8)), three road speed of adding up are 2113.584Mbps, much smaller than the speed of OTU1 payload 2488.32Mbps, middle difference on the frequency can be adjusted by inserting the GFP idle frame.
If SMT-1 encapsulates frame by frame, speed after the encapsulation is 156.416Mbps i.e. (155.52 * (2+2+2+2+2+2+2+ (9*270))/(9*270)), three road speed of adding up are 2106.416, and also much smaller than the speed of OTU1 payload, middle difference on the frequency is adjusted by inserting the GFP idle frame.
Application example 2:
Two-way STM-4 and one road GE business converge to OTU1 with the GFP-T encapsulation.
As shown in Figure 6, insert the business of three passages altogether, passage 1 and passage 2 are the professional STM-4 of low speed SONET/SDH, and passage 3 is data service GE, and present embodiment adopts the GFP-T encapsulation.
In the Add direction, for the GE business, in GE service access processing unit, the 10B code stream of serial is separated the sign indicating number into 8B, add K sign indicating number sign at each byte simultaneously, be sent to buffer FIFO, for the STM-4 business, owing to there is not physical layer encodes, therefore need not decoding, can increase indication (being equivalent to the indication of K sign indicating number), then data are outputed to FIFO at frame head.
Multiplexing Unit collects the data that each passage FIFO of poll sends here N superblock SuperBlock (SuperBlock is a kind of structure of stipulating in the GFP agreement) quantity that needs and is sent to the GFP-T unit package afterwards.
At the GFP-T encapsulation unit, the data that Multiplexing Unit is brought are at first carried out the 64B/65B coding, each 65B sign indicating number adds that CRC becomes a SuperBlock, N SuperBlock forms a GFP-T frame, and (N is big more, the GFP raw tape is wide big more, it is big more to delay time), only depend on the value of N and concrete traffic frame structure-irrelevant at the time-delay of business herein.
The GFP-T decapsulation unit is carried out opposite process.Except above-mentioned GFP-T encapsulation and decapsulation unit part, other are handled with similar operations in the application example 1.
For the GFP packaging efficiency of SONET/SDH, be provided with differently according to the quantity of the division of GFP-F frame and GFP-TSuperblock, specifically can under the minimum situation of time-delay, carry out branch frame or piecemeal according to actual bandwidth.If with N=5 is that example is calculated, the speed of every road STM-4 is 622.08Mbps, carry out speed after the GFP-T encapsulation and be 662.904Mbps (622.08 * (2+2+2+2+2+2+2+65 * 5+2)/(64 * 5)), and the professional payload of GE is 1Gbps, carry out speed after the GFP-T encapsulation and be 1065.625Mbps (1000 * (2+2+2+2+2+2+2+65 * 5+2)/(64 * 5)), three tunnel total speed are 2391.433Mbps, much smaller than the speed of OTU1 payload 2488.32Mbps, middle difference on the frequency can be adjusted by inserting the GFP idle frame.The value minimum that can calculate N for the situation in this example is 3.Generally speaking, N is big more, and bandwidth availability ratio is high more, but correspondingly, time delay is also big more.The value of N can be adjusted according to the actual requirements.
The present invention is based on the method for SONET/SDH and the data service mixing and concourse of GFP, make SONET/SDH (particularly low speed SDH business) can be blended in the OTN network with data service and pass Send. Compared with prior art, the present invention directly the SONET/SDH service signal is encapsulated into GFP and One of data service transmits, and can realize directly transmitting in the OTN network SONET/SDH of low speed Service signal takes full advantage of bandwidth resources, and can realize all low speed SONET/SDH business clocks Transparent transmission, rather than traditional converge to earlier high speed SONET/SDH be encapsulated into again OTN (can't be simultaneously The clock of all low speed SONET/SDH of transparent transmission, the mode that can only adjust with pointer).
Claims (13)
1, a kind of mixing and concourse of multi-service device based on Generic Framing Procedure, it is characterized in that, this device comprises that service access processing unit, Multiplexing Unit, GFP encapsulation unit, OTN become frame unit, OTN to separate frame unit, GFP decapsulation unit and the professional processing unit that sends, wherein
The service access processing unit is used for the SONET/SDH business code flow or the data code flow of each passage of client's side are alignd, and decides frame or decoding, and extracts business datum and buffer memory;
Multiplexing Unit is used for the buffer memory of each service channel of cyclic query successively, need to judge whether the data of transmission, if have then data carried out the speed adjustment, extract the gap marker information of data, send to the GFP encapsulation unit, if do not have then the next passage of poll together with data.
The GFP encapsulation unit is used for that the business data flow after multiplexing is carried out GFP and seals and operate, and distinguishes gap marker with the CID in the GFP expansion frame head;
OTN becomes frame unit, is used for the output of GFP encapsulation unit is put into the payload OPUk of ODUk, and finishes the filling of OTN expense, forms complete OTN frame signal;
OTN separates frame unit, be used to finish circuit the OTN signal separate frame operation, the OPUk payload that solves;
The GFP decapsulation unit is used for GFP is carried out decapsulation, parses gap marker and data;
Demultiplexing unit is used for the CID gap marker that parses according to the GFP decapsulation unit, and the data in the corresponding GFP payload are outputed in the corresponding business transmitting element;
Business sends processing unit, is used for the data of buffer memory GFP payload, the professional tranmitting data register of regeneration SONET/SDH and transmission SONET/SDH business and data service.
2, device as claimed in claim 1, it is characterized in that: described service access processing unit comprises that some SONET/SDH service accesses are handled subelement and the plurality of data service access is handled subelement, the described professional processing unit that sends comprises that subelement is handled in the professional transmission of some SONET/SDH and professional transmission of plurality of data handled subelement, wherein, the corresponding service access of each SONET/SDH business code flow or data code flow is handled subelement and the professional processing subelement that sends.
3, device as claimed in claim 1, it is characterized in that: the GFP encapsulation unit is to SONET/SDH when professional, with the SONET/SDH signal by the row or divide frame by frame after, be encapsulated into the GFP-F frame, or the SONET/SDH signal is carried out 64B/65B encode, be encapsulated into superblock SuperBlock again, enclose the GFP-T frame at last.
4, device as claimed in claim 1, it is characterized in that: described Multiplexing Unit also is used for extracting and Client Signal Fail CSF information, described GFP encapsulation unit also is used for producing the GFP management frames according to CSF information, be responsible for the transmission of the professional failure state CSF of client's side mapping, described decapsulation unit also is used to resolve CSF information, and described service transmitting unit also is used for doing corresponding crash handling according to CSF information industry on corresponding passage.
5, device as claimed in claim 1, it is characterized in that: if the clock of GFP encapsulation back sending direction becomes the speed of frame unit different with OTN, described GFP encapsulation unit also is used for filling the GFP idle frame at the GFP Frame, and described GFP decapsulation unit also is used to delete idle frame.
6, as each described device in the claim 1 to 5, it is characterized in that: described service access processing unit and the described professional processing unit that sends adopt first in first out buffer FIFO to carry out metadata cache, the described professional processing unit that sends also comprises voltage controlled oscillator VCO, said professional transmission processing unit is used for controlling voltage controlled oscillator VCO according to the empty full state of the FIFO of the professional direction to be sent of SONET/SDF and produces tranmitting data register, thus realization SONET/SDH clock regeneration.
7, device as claimed in claim 6 is characterized in that: the described professional processing unit that sends comprises that also low pass filter is used for the signal that voltage controlled oscillator produces is carried out filtering and level and smooth.
8, a kind of mixing and concourse of multi-service method based on Generic Framing Procedure is characterized in that this method may further comprise the steps:
(a) SONET/SDH business code flow or the data service code stream to each passage of client's side aligns, and decides frame or decode operation, extracts business datum and buffer memory;
(b) each service channel of cyclic query successively need to judge whether the data that send, if having then data are carried out the speed adjustment, extracts the gap marker information of data, and changes execution in step c, otherwise the next passage of poll;
(c) business data flow after multiplexing is carried out the GFP encapsulating operation, distinguish gap marker with the CID in the GFP expansion frame head;
(d) data flow after will encapsulating is put into the payload OPUk of ODUk, and carries out the filling of OTN expense, forms complete OTN frame signal;
(e) the OTN signal is separated frame, solve the OPUk payload;
(f) GFP is carried out decapsulation, parse gap marker and data;
(g), the data in the corresponding GFP payload are outputed in the corresponding business transmission buffer according to gap marker;
(h) the professional tranmitting data register of regeneration SONET/SDH, and send SONET/SDH business and data service.
9, method as claimed in claim 8, it is characterized in that: in the step (c), when encapsulating for the SONET/SDH business, with the SONET/SDH signal by the row or divide frame by frame, be encapsulated into the GFP-F frame then, or after the SONET/SDH signal carried out 64B/65B coding, be encapsulated into superblock again, enclose the GFP-T frame at last.
10, method as claimed in claim 8, it is characterized in that: become the speed of frame unit different if GFP encapsulates the clock of back sending direction with OTN in the step (c), then in the GFP Frame, intert the GFP idle frame, in the step (f) during to the decapsulation of GFP data, the deletion idle frame.
11, method as claimed in claim 8, it is characterized in that: step (b) also comprises the Client Signal Fail information of extracting when multiplexing, when carrying out the GFP encapsulation in the step (c), produce the GFP management frames according to client's fail message, step (f) is during to the GFP decapsulation, also comprise the CSF information that parses, also comprise according to client's fail message in the step (h) and carry out corresponding crash handling, carry out the failure state transmission.
12, as each described method of claim 8 to 11, it is characterized in that: step (a) and (f) in adopt first in first out buffer FIFO to carry out metadata cache, control voltage controlled oscillator VCO according to the empty full state of the FIFO of the professional direction to be sent of SONET/SDF in the step (f) and produce tranmitting data register, thereby realize the SONET/SDH clock regeneration.
13, method as claimed in claim 12 is characterized in that: the signal that utilizes low pass filter that voltage controlled oscillator is produced in the step (f) carries out filtering and level and smooth, to produce the stable clock signal.
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