CN101150879B - Intercrossed scheduling system and method based on optical transmission network - Google Patents
Intercrossed scheduling system and method based on optical transmission network Download PDFInfo
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- CN101150879B CN101150879B CN2007101631364A CN200710163136A CN101150879B CN 101150879 B CN101150879 B CN 101150879B CN 2007101631364 A CN2007101631364 A CN 2007101631364A CN 200710163136 A CN200710163136 A CN 200710163136A CN 101150879 B CN101150879 B CN 101150879B
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Abstract
A cross dispatching system based on an optical transmission network is provided, the system includes: a system clock unit which is used to provide the synchronizing processing clock for the OTU1V bus of the cross dispatching system; an accessing signal processing unit which is connected to the OTU1V timeslot cross unit through the OTU1V bus is used to receive the access signal and process the access signal, and sends the processed OTU1V frame to the OTU1V timeslot cross unit through the OTU1V bus; an OTU1V timeslot cross unit which is connectrd to the circuit processing unit through the OTU1V bus is used to decode frame, timeslot crossing, processing the frame for the OUT1V frame, and the compound OTU1V is sent to the circuit processing unit through the OTU1V bus; the circuit processing unit is used to reuse received compound OTU1V frames as the electrical signal then converting the electrical signal into the wave division multiplexing system optical signal, thereby accessing the access signal in the wave division multiplexing system network.
Description
Technical field
The present invention relates to optical communication and transmit the network technology field, more specifically, relate to a kind of intercrossed scheduling system and method based on optical transfer network.
Background technology
Develop rapidly along with data service, broadband access, 3G business, transmit net loaded service bandwidth also in continuous growth, in order to satisfy the needs that existing bandwidth increases, International Telecommunications Union has defined (the Optical Transport Hierarchy based on OTH at ITU-T in G.709, optical transport hierarchy) optical transport network (OTN) standard, the OTN technology is because of its big intersection particle, transparent transmission client business, the packaging efficiency height, the advantages such as wavelength management ability that strengthen become the mainstream technology that transmits net gradually.Core net evolves to transmission net based on OTN by existing transmission net based on Synchronous Optical Network/synchronous optical network (SDH/SONET) gradually.Particularly in dense wave division multipurpose (DWDM) field, the optical transfer network technology has become tranmission techniques main in the dwdm system, and OTUk (k=1,2,3) frame structure also obtains increasing the application in wavelength-division system.
Simultaneously, operator has also proposed new demand to the cross scheduling of services of large granularities, under the application scenario of some pure services of large granularities, for example, metro core or broadband services metropolitan area in vogue converges, local key, bulky grain special line or network area, all need bulky grain scheduling efficiently and transmission, therefore digital wrapper/the interleaving techniques based on OTN also becomes one of necessary condition that realizes efficient scheduling.
In the prior art, there is multiple scheme can realize the cross scheduling function of OTN signal, in the CN200410103304 patent prior art has been carried out labor, and proposed a kind of system based on STM-17 bus form unified scheduling Synchronous Optical Network and optical transport network.Wherein, this system comprises a synchronous cross matrix based on the STM-1 particle, is the center with this matrix, links to each other with optical transport network Signal Filtering Unit all around by the STM-17 bus.The STM-17 bus with the OIF-TFI5-0.1.0 bus type seemingly, it has defined 17 STM-1 cascades, specifically as shown in Figure 1.
Yet, there is following defective in this bus form, at first still be intersection in essence based on Synchronous Optical Network based on intersecting at of this bus form, and do not belong to intersection based on optical transfer network, secondly when system call OTN is professional, need finish the conversion that OTN arrives OTN again to STM-17 (SDH), increased the processing procedure of SDH (STM-17), the actual more complicated that implements, cost is higher.
In addition, in the technical scheme of CN200410103304, the optical transport network Signal Filtering Unit has only been contained Synchronous Optical Network signal and optical transport network signal, the fastest for current growth, the Gigabit Ethernet, optical-fibre channel (FC), the Digital Television data services such as (DVB) that occupy network bandwidth maximum in the future do not define the corresponding interface processing unit.And the using method of this technical scheme in wavelength-division multiplex system is not described yet.
Summary of the invention
Defective based on above existing dispatching patcher, the present invention proposes a kind of based on optical transfer network, have Synchronous Optical Network interface, optical transport network interface and data service interface simultaneously, support the OTN cross scheduling, and can be used in the intercrossed scheduling system and the method for wavelength division multiplexed network.
The invention provides a kind of intercrossed scheduling system based on optical transfer network, be used to make wavelength-division multiplex system to utilize optical transfer network to realize cross scheduling, it comprises: system clock unit is used to the OTU1V bus in the intercrossed scheduling system that synchronizing processing clock is provided; Insert signal processing unit, be connected to OTU1V time slot cross unit, be used for receiving and insert signal, handle inserting signal, and the OTU1V frame that will obtain after will handling sends to OTU1V time slot cross unit by the OTU1V bus by the OTU1V bus; OTU1V time slot cross unit is connected to Line Processing Unit by the OTU1V bus, be used for the OTU1V frame carried out separate frame, time slot intersects and framing is handled, and, will synthesize the OTU1V frame and send to Line Processing Unit by the OTU1V bus; And Line Processing Unit, the synthetic OTU1V frame that is used for receiving is multiplexed with the signal of telecommunication, is the wavelength-division multiplex system light signal with electrical signal conversion then, inserts the wavelength-division multiplex system network thereby realized inserting signal.
In the present invention, insert signal comprise following one of at least: Synchronous Optical Network signal, optical transport network signal and data network service signal, wherein, the data network service signal comprise following one of at least: ethernet signal, channel optical signal, the interconnected signal of enterprise and digital television signal.
Inserting signal processing unit is the Synchronous Optical Network signal processing unit, is used to handle the Synchronous Optical Network signal of access; Wherein, the Synchronous Optical Network signal processing unit comprises: Synchronous Optical Network adaptation unit, Synchronous Optical Network clock adjustment unit become frame unit with OTU1V.
Inserting signal processing unit is the optical transport network signal processing unit, be used to handle the optical transport network signal of access, wherein, the optical transport network signal processing unit comprises: optical transport network adaptation unit, optical transport network clock adjustment unit become frame unit with OTU1V.
In addition, inserting signal processing unit is the data network service signal processing unit, be used to handle the data network service signal of access, wherein, the data network service signal processing unit comprises: data service adaptation unit, data service map unit become frame unit with OTU1V.
According to the present invention, OTU1V time slot cross unit comprises: OTU1V separates frame unit, is used for solving net load from the OTU1V frame; The OTU1V sub-slots is unified scheduling unit, is used for that net load is carried out time slot and intersects; And OTU1V one-tenth frame unit, be used for again synthetic OTU1V frame.
Wherein, Line Processing Unit comprises: the OTU1V processing unit, be used for synthetic OTU1V frame can't harm to switch conciliating the frame processing, obtain standard OTU frame; The optical transport network Multiplexing Unit is used for standard OTU frame is carried out the multiplexing signal of telecommunication that obtains; And photoelectric conversion unit, being used for electrical signal conversion is the wavelength-division multiplex system light signal.
In addition, Line Processing Unit also is used for the wavelength-division multiplex system light signal is converted to the signal of telecommunication, is standard OTU frame with signal of telecommunication demultiplexing, and standard OTU is carried out framing handle and to obtain the OTU1V frame, sends to OTU1V time slot cross unit by the OTU1V bus then; OTU1V time slot cross unit also is used for the OTU1V frame is sent to the access signal processing unit; And insert signal processing unit and also be used for the OTU1V frame from OTU1V time slot cross unit is reduced to original access signal, thereby realize inserting the process that the wavelength-division multiplex system network extraction inserts signal from inserting signal.
The present invention also provides a kind of cross scheduling method based on optical transfer network, be used to make wavelength-division multiplex system to utilize optical transfer network to realize cross scheduling, it comprises: step 1, and the access signal processing unit will insert the OTU1V frame asynchronous mapping that obtains after the signal adaptation and arrive the OTU1V bus; Step 2, OTU1V timeslot scheduling unit is separated frame to the OTU1V frame and is obtained net load, and net load is carried out cross scheduling, obtains synthetic OTU1V frame then again; And step 3, Line Processing Unit is separated the frame processing to synthetic OTU1V frame and is obtained standard OTU frame, then to the multiplexing signal of telecommunication that obtains of standard OUT frame, and with electrical signal conversion is the wavelength-division multiplex system light signal, inserts the wavelength-division multiplex system network thereby realized inserting signal.
In addition, this method is further comprising the steps of: Line Processing Unit wavelength-division multiplex system light signal is converted to the signal of telecommunication, with signal of telecommunication demultiplexing is standard OTU frame, and standard OTU is carried out framing handle and to obtain the OTU1V frame, sends to OTU1V time slot cross unit by the OTU1V bus then; OTU1V time slot cross unit sends to the access signal processing unit with the OTU1V frame; And insert signal processing unit the OTU1V frame is reduced to original access signal, thereby realize inserting the process that the wavelength-division multiplex system network extraction inserts signal from inserting signal.
Thereby, adopt the present invention, can realize that Synchronous Optical Network (SDH) signal, optical transport network (OTN) signal and various data network service signal insert wavelength division multiplexing (DWDM) network simultaneously on the one hand, and grow the function of Distance Transmission by the DWDM network, finishing various access signals on the other hand on the electricity layer is that the intersection particle carries out the operation of cross scheduling to the mapping of optical transport network and with OTN.
Thereby, can in the DWDM optical-fiber network, insert Synchronous Optical Network (SDH) signal, optical transport network (OTN) signal and various data network service signal simultaneously with lower cost, and be that the unit carries out cross scheduling flexibly with OTU1V.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is a STM-17 bus frame structure schematic diagram of the prior art;
Fig. 2 is the block diagram according to the intercrossed scheduling system based on optical transport network of the present invention;
Fig. 3 is the OTU1 frame structure that G.709 defines;
Fig. 4 is the OTU1V frame structure;
Fig. 5 is the composition schematic diagram based on the DWDM cross system of optical transfer network according to the embodiment of the invention; And
Fig. 6 is the flow chart according to the cross scheduling method based on optical transport network of the present invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
Fig. 2 is the block diagram according to the intercrossed scheduling system 200 based on optical transport network of the present invention.As shown in Figure 2, this system comprises: system clock unit 202 is used to the OTU1V bus in the intercrossed scheduling system that synchronizing processing clock is provided; Insert signal processing unit 204, be connected to OTU1V time slot cross unit 206 by the OTU1V bus, be used for receiving and insert signal, handle inserting signal, and the OTU1V frame that will obtain after will handling sends to OTU1V time slot cross unit 206 by the OTU1V bus; OTU1V time slot cross unit 206 is connected to Line Processing Unit 208 by the OTU1V bus, be used for the OTU1V frame carried out separate frame, time slot intersects and framing is handled, and, will synthesize OTU1V and send to Line Processing Unit 208 by the OTU1V bus; And Line Processing Unit 208, the synthetic OTU1V frame that is used for receiving is multiplexed with the signal of telecommunication, is the wavelength-division multiplex system light signal with electrical signal conversion then, inserts the wavelength-division multiplex system network thereby realized inserting signal.
In the present invention, insert signal comprise following one of at least: Synchronous Optical Network signal, optical transport network signal and data network service signal, wherein, the data network service signal comprise following one of at least: ethernet signal, channel optical signal, the interconnected signal of enterprise and digital television signal.
Inserting signal processing unit 204 is Synchronous Optical Network signal processing units, is used to handle the Synchronous Optical Network signal of access; Wherein, the Synchronous Optical Network signal processing unit comprises: Synchronous Optical Network adaptation unit, Synchronous Optical Network clock adjustment unit become frame unit with OTU1V.
Inserting signal processing unit 204 is optical transport network signal processing units, be used to handle the optical transport network signal of access, wherein, the optical transport network signal processing unit comprises: optical transport network adaptation unit, optical transport network clock adjustment unit become frame unit with OTU1V.
In addition, inserting signal processing unit 204 is data network service signal processing units, be used to handle the data network service signal of access, wherein, the data network service signal processing unit comprises: data service adaptation unit, data service map unit become frame unit with OTU1V.
According to the present invention, OTU1V time slot cross unit 206 comprises: OTU1V separates frame unit, is used for solving net load from the OTU1V frame; The OTU1V sub-slots is unified scheduling unit, is used for that net load is carried out time slot and intersects; And OTU1V one-tenth frame unit, be used for again synthetic OTU1V frame.
Wherein, Line Processing Unit 208 comprises: the OTU1V processing unit, be used for synthetic OTU1V frame can't harm to switch conciliating the frame processing, obtain standard OTU frame; The optical transport network Multiplexing Unit is used for standard OTU frame is carried out the multiplexing signal of telecommunication that obtains; And photoelectric conversion unit, being used for electrical signal conversion is the wavelength-division multiplex system light signal.
In addition, Line Processing Unit 208 also is used for the wavelength-division multiplex system light signal is converted to the signal of telecommunication, with signal of telecommunication demultiplexing is standard OTU frame, and standard OTU is carried out framing handle and to obtain the OTU1V frame, sends to OTU1V time slot cross unit 206 by the OTU1V bus then; OTU1V time slot cross unit 206 also is used for the OTU1V frame is sent to access signal processing unit 204; And insert signal processing unit 204 and also be used for the OTU1V frame from OTU1V time slot cross unit 206 is reduced to original access signal, thereby realize inserting the process that the wavelength-division multiplex system network extraction inserts signal from inserting signal.
Should be appreciated that, in order to simplify mapping relations and to realize the mapping of bulky grain access service, after the processing of eliminating the SDH layer, the present invention has defined a kind of frame structure---OTU1V frame again on the basis of OTU1 frame, as shown in Figure 4, wherein, G.709 the OTU1V frame structure of middle regulation as shown in Figure 3.
Because transmission range was short when the signal of telecommunication transmitted at backboard, it is little to disturb, error code can not appear generally, so the OTU1V frame also uses the part of the FEC in the OTU1 frame as net load, thereby increased the bandwidth of core bus, make core bus can carry net load and the expense that inserts the OTN business simultaneously, help the transparent access of bulky grain OTN business.Simultaneously in order to increase the flexibility of scheduling, the OTU1V frame is divided into 16 time slots to classify the unit as, and the mode that 16 time slots interleave with row is formed the net load of OTU1V, and definition OTU1V frame the 17th to 33 classify the payload overhead area as, still with the unit of classifying as, deposit the expense of 16 time slots respectively.
The OTU1V frame uses A1, A2 to come as the frame head indication, and SM-BIP8 does the error monitoring of bus, and ODU1V, OPU1V expense can be according to the self-defined uses of user's needs for keeping expense.
The structure of OTU1V frame net load columns under the prerequisite that keeps basic expense of OTH (OTU, ODU and OPU expense) and 4 row can be changed, and the number of time slots of OTU1V frame division simultaneously also can be adjusted.
Fig. 5 is the composition schematic diagram based on the DWDM cross system of optical transfer network according to the embodiment of the invention.As shown in Figure 5, the cross system based on optical transfer network mainly comprises following components: system clock unit 10, the signal processing unit, OTU1V time slot cross unit and the DWDM Line Processing Unit that connect by the OTU1V bus.
Wherein, system clock unit 10 is used to provide the synchronizing processing clock of connecting bus between signal processing unit, OTU1V time slot cross unit and the DWDM Line Processing Unit.
Signal processing unit can be divided into three classes: Synchronous Optical Network (SDH) signal processing unit 30, OTN signal processing unit 40 and data network service signal processing unit 50.Data network service refers to that Gigabit Ethernet, optical-fibre channel (FC), enterprise's interconnection service (ESCON), Digital Television (DVB) etc. are professional.This unit links to each other with OTU1V time slot cross unit by the OTU1V bus.Receive direction, the access of signal is realized in this unit, and signal is handled, and is mapped to the OTU1V bus, sends to OTU1V time slot cross unit by the OTU1V bus then; Sending direction, this unit receives the OTU1V frame that comes from OTU1V time slot cross unit, at first solves the service signal after adaptive from the OTU1V frame, reduces original access signal then, and sends to outside the system.
SDH signal processing unit 30 is used to handle the Synchronous Optical Network signal of connecting system, and it can be subdivided into SDH adaptation unit 31, SDH clock adjustment unit 32 and OTU1V framing/separate frame unit 33 again.
OTH signal processing unit 40 is used to handle the optical transport network signal of connecting system, and it can be subdivided into OTN adaptation unit 41, OTN clock adjustment unit 42 and OTU1V framing/separate frame unit 43 again.
Data network service signal processing unit 50 is used to handle the various data network signals of connecting system, and it can be subdivided into data service adaptation unit 51, data service again and shine upon/separate map unit 52 and OTU1V framing/separate frame unit 53.
OTU1V time slot cross unit is connected by the OTU1V bus with the DWDM Line Processing Unit with signal processing unit, be used to finish the OTU1V frame framing, separate frame and time slot and intersect, can be divided into three parts: OTU1V framing, OTU1V separate frame unit and the OTU1V sub-slots is unified scheduling unit.At first separate frame unit through OTU1V from the OTU1V frame of OTU1V bus and solve net load, net load process OTU1V sub-slots is unified the output port that is crossed to scheduling unit of scheduling unit then, at last again through the synthetic again OTU1V frame in OTU1V framing unit.
The DWDM Line Processing Unit is finished the multiplex/demultiplex of OTU1V frame to standard OTUk (k=1,2,3) frame, and the signal of telecommunication is with the mutual conversion of DWDM light signal.This unit comprises OTU1V processing unit, OTN multiplex/demultiplex unit and photoelectricity/electrooptic switching element three parts.Sending direction, OTU1V signal from the OTU1V bus, at first finish the work such as switching, separate frame that can't harm through the OTU1V processing unit, enter the OTN Multiplexing Unit then, realization OTUk's (k=1,2,3) is multiplexing, be to meet the DWDM light signal that G.692 ITU-T requires through electrooptic switching element with electrical signal conversion at last, send in the optical fiber; Receive direction, photoelectric conversion unit solve OTUk (k=1,2,3) frame from the light signal of DWDM wavelength, then to its demultiplexing, at last the payload of demultiplexing is carried out the framing of OTU1V, and send on the OTU1V bus.
Next, according to access service types among Fig. 5, adopt different embodiment that the processing procedure of intercrossed scheduling system of the present invention when inserting data network signals and adopting the OTU2 frame to transmit on dwdm system is described.
First embodiment
With the gigabit Ethernet is example, and the processing procedure of intercrossed scheduling system of the present invention when inserting data network signals and adopting the OTU2 frame to transmit on dwdm system is described.
At first, 1000BASE-SX GE signal enters the data service adaptation unit (51) of data service processing unit 50, and this unit carries out the 10B/8B decoding to signal, monitoring GE synchronization loss, carry out the ethernet frame verification, and add up the wrong frame number of Ethernet frame number, Ethernet that receives.Enter the data service map unit through the decoded data of 10B/8B, this unit adopts system clock that data are carried out GFP (general frame forming process) framing.
Because the bandwidth of gigabit Ethernet business has only OTU1V payload bandwidth half, so one road GE signal only takies half OTU1V payload time slot, after thereby gfp frame is sent to OTU1V one-tenth frame unit, the form that interleaves with byte is filled the even number time slot or the odd number time slot of OTU1V payload, and the unnecessary time slot of OTU1V frame uses the GFP idle frame to fill.
The OTU1V that sends to OTU1V timeslot scheduling unit 20 input ports from the OTU1V bus signals of data service processing unit output separates frame unit 21, removing the frame of OTU1V delimits and overhead part, and SM-BIP carried out verification, unify time slot cross scheduling that scheduling unit 22 takies the GE business according to the configuration of webmaster by the OTU1V sub-slots then and become frame unit 21 to the OTU1V at output port place, OTU1V timeslot scheduling unit.OTU1V becomes frame unit 21 to finish the OTU1V framing, recomputate SM-BIP, add work such as A1A2 after, by the OTU1V bus OTU1V frame is sent to DWDM Line Processing Unit 60.
DWDM Line Processing Unit 60 solves the ODU1V part by OTU1V processing unit 61 after receiving the OTU1V frame, and bandwidth unnecessary with respect to ODU1 among the ODU1V abandoned, the ODU1 signal that carries the GE signal then is multiplexed in the OTU2 frame according to the multiplex mode G.709 by the OTN Multiplexing Unit, converts to by electrooptic switching element at last to meet the DWDM light signal that G.692 ITU-T requires.
Certainly, said process also comprises corresponding inverse process.
Second embodiment
With OTU2 is example, and the processing procedure of intercrossed scheduling system of the present invention when inserting the optical transport network signal and adopting the OTU2 frame to transmit on dwdm system is described.
At first, the OTU2 signal enters the OTN adaptation unit (41) of OTN signal processing unit 40, this unit carries out deciding frame, detection of loss of frames, dropout, finishes the SM-BIP verification, finishes forward error correction (FEC) signal, and abandons OTU2 expense and the FEC part of OTU2, keeps the ODU2 part.The OPU2 JC (Justification Control) of the ODU2 signal that the clock adjustment that OTN clock adjustment unit provides according to system clock unit keeps, access service is carried out the system clock synchronization, net load and expense with adjusted ODU2 signal together is mapped in the net load of 4 road OTU1V frames then, the mode by byte allocation is adopted in mapping, be the 4m+n (n=1/2/3/4 of OTU2,0≤m≤956) individual byte is put in the payload of n road OTU1V frame, all fixing filling of time slot that the OTU1V frame is unnecessary, recomputate the SM-BIP of 4 road OTU1V respectively, and increase frame head A1, A2.The ODU2 signal bandwidth is basic identical with 4 road OTU1V net load total bandwidths, so corresponding 4 the OTU1V frames of ODU2 frame, this 4 road OTU1V binding intersects during intersection.
The OTU1V that sends to OTU1V timeslot scheduling unit 20 input ports from the OTU1V bus signals of OTU signal processing unit output separates frame unit 21, removing the frame of OTU1V delimits and overhead part, and SM-BIP carried out verification, unify scheduling unit 22 by the OTU1V sub-slots then and intersect 4 road OTU1V according to the configuration of webmaster binding, the time slot cross scheduling that the ODU2 business is taken is to the OTU1V one-tenth frame unit 21 at output port place, OTU1V timeslot scheduling unit.OTU1V becomes frame unit 21 to finish the OTU1V framing, recomputate SM-BIP, add work such as A1A2 after, by the OTU1V bus OTU1V frame is sent to DWDM Line Processing Unit 60.
DWDM Line Processing Unit 60 solves the ODU1V part by OTU1V processing unit 61 after receiving and bundling 4 road OTU1V frames that intersect, and therefrom extract the ODU2 signal merge access, recomputate the SM-BIP of OTU2, increase OTU2 frame head A1A2, recomputate OTU2 forward error correction (FEC), convert to by electrooptic switching element at last and meet the DWDM light signal that G.692 ITU-T requires.
Should be appreciated that said process also comprises corresponding inverse process.
The 3rd embodiment
With STM-16 is example, and the processing procedure of intercrossed scheduling system of the present invention when inserting phototiming network signal and adopting the OTU2 frame to transmit on dwdm system is described.
At first, the STM-16 signal enters the SDH adaptation unit 31 of SDH signal processing unit 30, this unit to signal carry out deciding frame, detection of loss of frames, dropout, finish B1, the B2 verification.The clock adjustment that SDH clock adjustment unit provides with system clock unit inserts the pointer of STM-16 signal, access service is carried out the system clock synchronization, then according to ITU-T G.709 the regulations of 17.1 joints net load and the expense of adjusted STM-16 together is mapped in the OTU1V frame, all fixing filling of time slot that the OTU1V frame is unnecessary, recomputate the SM-BIP of OTU1V, and increase frame head A1, A2.The STM-16 signal bandwidth is basic identical with OTU1V net load bandwidth, so the corresponding OTU1V frame of STM-16 frame.
The OTU1V that sends to OTU1V timeslot scheduling unit 20 input ports from the OTU1V bus signals of SDH signal processing unit output separates frame unit 21, removing the frame of OTU1V delimits and overhead part, and SM-BIP carried out verification, unify scheduling unit 22 will carry the STM-16 business according to the configuration of webmaster time slot cross scheduling by the OTU1V sub-slots then and become frame unit 21 to the OTU1V at output port place, OTU1V timeslot scheduling unit.OTU1V becomes frame unit 21 to finish the OTU1V framing, recomputate SM-BIP, add work such as A1A2 after, by the OTU1V bus OTU1V frame is sent to DWDM Line Processing Unit 60.
DWDM Line Processing Unit 60 solves the ODU1V part by OTU1V processing unit 61 after receiving the OTU1V frame, and bandwidth unnecessary with respect to ODU1 among the ODU1V abandoned, the ODU1 signal that carries the STM-16 signal then is multiplexed in the OTU2 frame according to the multiplex mode G.709 by the OTN Multiplexing Unit, converts to by electrooptic switching element at last to meet the DWDM light signal that G.692 ITU-T requires.
Certainly, said process also comprises corresponding inverse process.
Fig. 6 is the flow chart according to the cross scheduling method based on optical transport network of the present invention.As shown in Figure 6, this method may further comprise the steps:
Step S602, the access signal processing unit will insert the OTU1V frame asynchronous mapping that obtains after the signal adaptation and arrive the OTU1V bus;
Step S604, OTU1V timeslot scheduling unit is separated frame to the OTU1V frame and is obtained net load, and net load is carried out cross scheduling, obtains synthetic OTU1V frame then again; And
Step S606, Line Processing Unit is separated the frame processing to synthetic OTU1V frame and is obtained standard OTU frame, then to the multiplexing signal of telecommunication that obtains of standard OUT frame, and with electrical signal conversion is the wavelength-division multiplex system light signal, inserts the wavelength-division multiplex system network thereby realized inserting signal.
In addition, this method is further comprising the steps of: Line Processing Unit wavelength-division multiplex system light signal is converted to the signal of telecommunication, with signal of telecommunication demultiplexing is standard OTU frame, and standard OTU is carried out framing handle and to obtain the OTU1V frame, sends to OTU1V time slot cross unit by the OTU1V bus then; OTU1V time slot cross unit sends to the access signal processing unit with the OTU1V frame; And insert signal processing unit the OTU1V frame is reduced to original access signal, thereby realize inserting the process that the wavelength-division multiplex system network extraction inserts signal from inserting signal.
Particularly, cross scheduling method of the present invention comprises signal through system's access DWDM network development process with from DWDM network extraction access service process, and wherein, signal inserts the DWDM network development process through system and may further comprise the steps:
1, the phototiming network signal of connecting system, optical transport network signals and data services network signal enter the Synchronous Optical Network signal processing unit respectively, optical transport network signal processing unit and data network service signal processing unit, the adaptive back asynchronous mapping of these unit of process is on the OTU1V bus, the OTU1V bus adopts system clock as its reference clock, wherein, the OTU1V bus is a kind of bus based on the OTN frame structure, this bus adopts the structure that is similar to OTU1, keep OTU1, the expense of ODU1 and OPU1, the 4 row structures that keep OTU1, forward error correction (FEC) part of cancellation OTU1, but the net load columns of OTU1V is with the OTU1 difference, can define voluntarily according to the needs of transmission the net load columns (such as with the FEC of OTU1 part also as net load, this moment, net load was 4064 row);
2, the OTU1V that at first enters OTU1V timeslot scheduling unit of the OTU1V frame on the OTU1V bus separates frame unit, finish and decide frame, error checking, and the net load among the extraction OTU1V, the net load of Ti Chuing becomes frame unit in the mode that time slot intersects by the OTU1V that the same scheduling unit of OTU1V sub-slots is crossed to output port according to the setting of webmaster then, net load after intersecting at last is mapped on the bus of OTU1V once more, regenerates the OTU1V frame; And
3, the OTU1V frame that regenerates after scheduling enters the DWDM Line Processing Unit at last, at first finish operations such as deciding frame, error monitoring, removal byte of padding or idle frame, be multiplexed into the OTN signal through the OTU Multiplexing Unit then, OTN signal after at last multiplexing is converted to through electrooptic switching element and meets the light signal that the DWDM wavelength requires, and sends in the optical fiber.
From DWDM network extraction access service process is the inverse process of said process.
In sum,, can in the DWDM optical-fiber network, insert SDH signal, OTN signal and various data network service signal simultaneously, and be that the unit carries out cross scheduling flexibly with OTU1V with lower cost by intercrossed scheduling system of the present invention and method.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the intercrossed scheduling system based on optical transfer network is used to make wavelength-division multiplex system to utilize optical transfer network to realize cross scheduling, it is characterized in that, comprising:
System clock unit is used to the OTU1V bus in the described intercrossed scheduling system that synchronizing processing clock is provided;
Insert signal processing unit, be connected to OTU1V time slot cross unit by described OTU1V bus, be used for receiving and insert signal, described access signal is handled, and the OTU1V frame that will obtain after will handling sends to described OTU1V time slot cross unit by described OTU1V bus;
Described OTU1V time slot cross unit, be connected to Line Processing Unit by described OTU1V bus, be used for that frame, time slot intersection and framing are separated in described OTU1V frame execution and handle, and, will synthesize the OTU1V frame and send to described Line Processing Unit by described OTU1V bus; And
Described Line Processing Unit, the described synthetic OTU1V frame that is used for receiving is multiplexed with the signal of telecommunication, is the wavelength-division multiplex system light signal with described electrical signal conversion then, thereby has realized described access signal is inserted the wavelength-division multiplex system network.
2. system according to claim 1 is characterized in that, described access signal comprise following one of at least: Synchronous Optical Network signal, optical transport network signal and data network service signal,
Wherein, described data network service signal comprise following one of at least: ethernet signal, channel optical signal, the interconnected signal of enterprise and digital television signal.
3. system according to claim 2 is characterized in that, described access signal processing unit is the Synchronous Optical Network signal processing unit, is used to handle the described Synchronous Optical Network signal of access;
Wherein, described Synchronous Optical Network signal processing unit comprises: Synchronous Optical Network adaptation unit, Synchronous Optical Network clock adjustment unit become frame unit with OTU1V.
4. system according to claim 2 is characterized in that, described access signal processing unit is the optical transport network signal processing unit, is used to handle the described optical transport network signal of access,
Wherein, described optical transport network signal processing unit comprises: optical transport network adaptation unit, optical transport network clock adjustment unit become frame unit with OTU1V.
5. system according to claim 2 is characterized in that, described access signal processing unit is the data network service signal processing unit, is used to handle the described data network service signal of access,
Wherein, described data network service signal processing unit comprises: data service adaptation unit, data service map unit become frame unit with OTU1V.
6. system according to claim 1 is characterized in that, described OTU1V time slot cross unit comprises:
OTU1V separates frame unit, is used for solving net load from described OTU1V frame; The OTU1V sub-slots is unified scheduling unit, is used for that described net load is carried out time slot and intersects; And
OTU1V becomes frame unit, is used for again synthetic described synthetic OTU1V frame.
7. system according to claim 1 is characterized in that, described Line Processing Unit comprises:
The OTU1V processing unit, be used for described synthetic OTU1V frame be can't harm and switch conciliate frame and handle, obtain standard OTU frame;
The optical transport network Multiplexing Unit is used for described standard OTU frame is carried out the multiplexing described signal of telecommunication that obtains; And
Photoelectric conversion unit, being used for described electrical signal conversion is described wavelength-division multiplex system light signal.
8. system according to claim 1 is characterized in that,
Described Line Processing Unit also is used for described wavelength-division multiplex system light signal is converted to the described signal of telecommunication, with described signal of telecommunication demultiplexing is standard OTU frame, and described standard OTU is carried out framing handle and to obtain described OTU1V frame, send to described OTU1V time slot cross unit by described OTU1V bus then;
Described OTU1V time slot cross unit also is used for described OTU1V frame is sent to described access signal processing unit; And
Described access signal processing unit also is used for the described OTU1V frame from described OTU1V time slot cross unit is reduced to original described access signal, thereby realizes inserting from described access signal the process of the described access signal of wavelength-division multiplex system network extraction.
9. the cross scheduling method based on optical transfer network is used to make wavelength-division multiplex system to utilize optical transfer network to realize cross scheduling, it is characterized in that, comprising:
Step 1, the access signal processing unit will insert the OTU1V frame asynchronous mapping that obtains after the signal adaptation and arrive the OTU1V bus;
Step 2, OTU1V timeslot scheduling unit is separated frame to described OTU1V frame and is obtained net load, and described net load is carried out cross scheduling, obtains synthetic OTU 1V frame then again; And
Step 3, Line Processing Unit is separated the frame processing to described synthetic OTU1V frame and is obtained standard OTU frame, then to the multiplexing signal of telecommunication that obtains of described standard OUT frame, and with described electrical signal conversion is described wavelength-division multiplex system light signal, thereby has realized described access signal is inserted the wavelength-division multiplex system network.
10. method according to claim 9 is characterized in that, and is further comprising the steps of:
Described Line Processing Unit is converted to the described signal of telecommunication with described wavelength-division multiplex system light signal, with described signal of telecommunication demultiplexing is standard OTU frame, and described standard OTU is carried out framing handle and to obtain described OTU1V frame, send to described OTU1V time slot cross unit by described OTU1V bus then;
Described OTU1V time slot cross unit sends to described access signal processing unit with described OTU1V frame; And
Described access signal processing unit is reduced to original described access signal with described OTU1V frame, thereby realizes inserting from described access signal the process of the described access signal of wavelength-division multiplex system network extraction.
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