CN100550716C - Realize professional method and system of intersecting - Google Patents
Realize professional method and system of intersecting Download PDFInfo
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- CN100550716C CN100550716C CN200410080817.0A CN200410080817A CN100550716C CN 100550716 C CN100550716 C CN 100550716C CN 200410080817 A CN200410080817 A CN 200410080817A CN 100550716 C CN100550716 C CN 100550716C
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Abstract
The invention discloses a kind of professional method of intersecting that realizes, carry out administrative unit (AU)-4 traffic frame that tributary unit (TU)-3 level traffic is intersected for preparing, this method may further comprise the steps: a. carries out low order channel alignment (LOPA) to described AU4 traffic frame to be handled; B. Administrative Unit Pointer in the AU-4 traffic frame (AU-PTR) and higher order path monitoring expense (POH) are duplicated; C. the AU-4 traffic frame is separated byte intertexture division multiplexing and be as the criterion the AU-3 traffic frame to carry out other intersection of AU-3 level, byte intertexture division multiplexing is an AU-4 traffic frame structure again; D. the AU-4 traffic frame behind the byte intertexture division multiplexing is carried out AU-PTR and recover and high-order POH Regeneration Treatment, revert to standard A U-4 traffic frame and output.The invention also discloses a kind of professional system of intersecting that realizes, adopt the inventive method and system to realize other service dispatching of TU-3 level, enlarge system's low order interlace algorithm capacity at the high-order cross matrix.
Description
Technical field
The present invention relates to synchronous digital hierarchy (SDH) technology, particularly realize professional method and system of intersecting in the SDH system.
Background technology
At present, along with science and technology development, the transinformation of Modern Communication System just sharply expands with a kind of form of acceleration.Like this, improve the capacity of transmission network and network element dispatching with regard to an urgent demand to business.Wherein, the SDH transmission system has obtained supporting widely and using with its exclusive synchronous multiplexing and mapping method, the transverse compatibility of interface, the powerful ability that administers and maintains.
So-called SDH transmission system is made up of the SDH network element, carries out synchronizing information transmission, multiplexing and cross-coupled network on optical fiber.Particularly, it has the standardized message structure grade of a cover, is called Synchronous Transport Module level-N (STM), and has block frame structure, allows to arrange abundant overhead-bits to be used for the operation maintenance (OAM) of network.
Wherein, ITU-T has stipulated the SDH synchronous multiplexing mapping structure that a whole set of is complete, and just multiplexing route can be multiplexed into the STM-N signal with several different methods with digital signal by these routes.Fig. 1 is the G.707 multiplexing mapping structure schematic diagram of ITU-T regulation.As shown in Figure 1, comprise basic Multiplexing Unit in the multiplexing structure: container (C), virtual container (VC), tributary unit (TU), tributary unit group (TUG), administrative unit (AU), administrative unit groups (AUG), the subscript of these Multiplexing Units is represented the signal rank of this Multiplexing Unit correspondence.Is example below in conjunction with Fig. 2 and Fig. 3 with two kinds of multiplexing routes that the 34Mbits/s signal multiplexing advances the STM-N signal, and multiplexing mapping structure is G.707 described in detail.
At first, the signal of 34Mbits/s is fitted to it in corresponding standard container C-3 through justification, add corresponding path overhead, C-3 is packaged into VC-3, this moment, the frame structure of VC-3 was 9 row * 85 row, as shown in Figure 1, the multiplexing STM-N of advancing of VC-3 has two lines: one, arrive STM-N via VC-3, TU-3, TUG-3, VC-4, AUG successively; Two, arrive STM-N via VC-3, AU-3, AUG successively.Wherein, Figure 2 shows that described first kind of multiplexing route, Figure 3 shows that described second kind of multiplexing route.
In Fig. 2, VC-3 directly separates out from high speed signal with it for the ease of the receiving terminal location, and the Tributary unit pointer (TU-PTR) that has increased by 3 bytes on the frame structure of VC-3 constitutes TU-3.In the frame structure of TU-3, fill in pseudo-random information R, then constitute the TUG-3 message structure of 9 row * 86 row.Fill in the C-4 frame structure that two row pseudo-random information R constitute 9 row * 260 row again after 3 TUG-3 byte intertexture division multiplexings, in order to monitor to the channel signal of C-4, add that before the frame structure of C-4 1 row path overhead is channel monitoring expense (POH), constitute the VC-4 frame structure of 9 row * 261 row.Because VC-4 is when packing AU-4 into, VC-4 floats the position in the AU-4 frame structure, therefore adds Administrative Unit Pointer (AU-PTR) and constitute AU-4 before the frame structure of VC-4, and indicate the position of VC-4 in AU-4 by AU-PTR.At last, AU-4 is added section overhead (SOH), just constituted the AUG frame structures of 9 row * 270 row, i.e. STM-1 frame structure has also just advanced the STM-1 signal with the signal multiplexing of 34Mbits/s.
Among Fig. 3,, before the frame structure of VC-3, fill in after the 1 row pseudo-random information R, add 1 row Higher Order Path Overhead POH again in order to monitor to the channel signal of VC-3; Because VC-3 is when packing AU-3 into, VC-3 floats the position in the AU-3 frame structure, and therefore, the AU-PTR that adds 3 bytes before the frame structure of VC-3 indicates the position of VC-3 in AU-3.3 AU-3 internodes are inserted and are copied as AU-4.At last, add SOH to AU-4, just constituted the AUG frame structures of 9 row * 270 row, i.e. STM-1 frame structure has also just advanced the STM-1 signal with the signal multiplexing of 34Mbits/s.
The signal multiplexing of 34Mbits/s can be advanced the STM-1 signal through Fig. 2 or multiplexing route shown in Figure 3, after this, 4 STM-1 byte intertexture division multiplexings are then obtained the STM-4 signal, and 4 STM-4 byte intertexture division multiplexings then obtain the STM-16 signal, and analogize the multiplexing various STM-N signals that obtain in proper order.
Similarly, the multiplexing route of various rate signals as shown in Figure 1.1.5Mbits/s signal can be multiplexed with TU-11/TU-12 via C-11, VC-11, form TUG-2 then; The signal of 2Mbits/s can be multiplexed with TU-12 via C-12, VC-12, forms TUG-2 then; The signal of 6Mbits/s can be multiplexed with TU-2 via C-2, VC-2, forms TUG-2 then.The TUG-2 that is formed can form AUG through VC-3, AU-3, also can form AUG through TUG-3, VC-4, AU-4, thereby obtain the STM-1 signal.In addition, the 14Mbits/s signal can be formed AUG through C-4, VC-4, AU-4, thereby obtains the STM-1 signal.At last, resulting STM-1 signal becomes the STM-N signal through byte intertexture division multiplexing.
In data transmission procedure, for satisfying the needs of service dispatching, SDH equipment may be that granularity is intersected with TU-3/TU-2/TU-12/TU-11, also may be that granularity is intersected with AU-4/AU-3.Wherein, other service dispatching of TU level is called low order interlace algorithm, needs to use the low order interlace algorithm matrix to intersect, and other service dispatching of AU level is called high-order and intersects, and needs to use the high-order cross matrix to intersect.
In the present implementation, the scheduling of SDH business adopts two cross matrixes of low-order and high-order to realize usually.Fig. 4 realizes block diagram for the professional low-order and high-order dispatching patcher of existing SDH.As shown in Figure 4, the high-order cross matrix is finished other service dispatching of AU-4 level, and the low order interlace algorithm matrix is finished other service dispatching of TU-3/TU-2/TU-12/TU-11 level.
Wherein, need carry out business that high-order intersects directly enter AU-4 high-order cross matrix intersect after output.Need carry out the business of low order interlace algorithm at first handled through low order channel alignment (LOPA) before carrying out low order interlace algorithm, as shown in Figure 4, perhaps carrying out LOPA before carrying out the high-order cross matrix handles, perhaps carrying out LOPA before entering the low order interlace algorithm matrix handles, through after the LOPA resume module, finish alignment from the low order channel of the low order interlace algorithm business of different business passage.According to the multiplexing mapping principle of above-mentioned SDH frame structure as can be known, the professional payload envelope (SPE) of AU-4 is to float in frame inside in the position of VC-4, indicates its position by AU-PTR.For business is carried out low order interlace algorithm, just must be with each low order channel alignment before intersection, just that each AU-PTR is indicated SPE adjusts to a fixing position.In the system, the corresponding LOPA module of the passage of an AU-4 high-order cross matrix, all LOPA modules all adopt same frame head and multi-frame signal to handle, thereby have guaranteed from the business of different passages its AU-PTR and multi-frame indication after through the LOPA module in full accord.Like this, carry out of the processing of the business of low order interlace algorithm through the high-order cross matrix, and before entering the low order interlace algorithm matrix, carried out the LOPA processing, after the low order interlace algorithm matrix intersects, enter the high-order cross matrix then once more and intersect and export, pass through the current business of finishing dealing with of high-order POH regeneration module at last and dispatch.Among Fig. 4, described AU-4 high-order cross matrix adopts the chip of AU-4 granularity to design, and carries out that the AU-4 rank is intersected and the business of carrying out low order interlace algorithm is all carried out other intersection of AU-4 level when entering AU-4 high-order cross matrix.At present, also can adopt the cross chips of AU-3 granularity to realize AU-3 high-order cross matrix, when entering AU-4 high-order cross matrix, the business of carrying out high-order and low order interlace algorithm carries out other intersection of AU-4/AU-3 level, because the AU-4 frame structure is made of 3 AU-3 frame structure byte intertexture division multiplexings, when then in this AU-3 high-order cross matrix, carrying out the scheduling of AU-4 level traffic, 3 AU-3 passages are tied up the intersection that realizes an AU-4 passage, and carry out other high-order of AU-3 level when intersecting, then each AU-3 traffic frame takies an AU-3 passage and carries out other intersection of AU-3 level.
Here, described AU-4/AU-3 high-order cross matrix, low order interlace algorithm matrix and LOPA module are that AU-4/AU-3 traffic frame structure is handled in essence, in actual process, the traffic frame that enters cross matrix is the STM-N signal form often, cross matrix will be separated byte intertexture division multiplexing with traffic frame according to the speed of input/output bus and become AU-4/AU-3 traffic frame structure to intersect, and byte intertexture division multiplexing is the output of STM-N signal again; The traffic frame that enters the LOPA module was the AU-4/AU-3 traffic frame by demultiplexing before entering the LOPA module of each cross aisle, and had been multiplexed with the STM-N signal after the LOPA module output of each cross aisle.
Wherein, POH is divided into high-order POH and low order POH, and the POH of AU-4 and AU-3 is high-order POH.Described multi-frame is designated as the indication byte among the high-order POH, that is: the byte H4 among C-4 or the added POH in VC-3 front, the multi-frame classification of this H4 byte indication Payload and the position of TU net load.And, have only when the 2Mbits/s signal multiplexing advances VC-4 the H4 byte just meaningful, because, the signal of 2Mbits/s is to pack into the form that 4 basic frames are formed a multi-frame when putting into C-12, receiving terminal is isolated the E1 signal for correct location just must know that current basic frame is which the basic frame in the multi-frame, the H4 byte be exactly the current TU-12 of indication be which individual basic frame of current multi-frame.Handling principle about LOPA module and high-order POH regeneration module belongs to prior art, is not described further at this.
By foregoing description as seen, the business of carrying out low order interlace algorithm enters the low order interlace algorithm matrix by the high-order cross matrix, needs to take the service channel of high-order cross matrix before entering the low order interlace algorithm matrix.Like this, the capacity of low order interlace algorithm matrix depends on the capacity of high-order cross matrix.Under the certain situation of high-order cross-capacity,, the access capability of high-order cross business is descended if enlarge the capacity of low order interlace algorithm matrix.In addition, in the realization that intersects, finish the intersection of same capability, cross grain is more little, and the difficulty of realization and cost are high more.In implementation shown in Figure 4, if the low order interlace algorithm matrix will be realized TU-3 and TU-12 granularity simultaneously and intersect, chip just must design according to smallest particles, promptly the granularity by TU-12 designs, and will realize that the intersection of a TU-3 passage must carry out the intersection of 21 TU-12 passages simultaneously.
Therefore, realize very difficulty of jumbo low order interlace algorithm, must adopt expensive new technology or use multicore sheet to expand the low order interlace algorithm matrix is carried out dilatation, and if guarantee the high-order cross-capacity, the high-order cross matrix also needs expansion, like this, design difficulty and cost are all quite high.
In addition, the another kind of scheme that realizes the SDH service dispatching at present is to adopt the cross matrix of full low order, and just whole system just has only a low order interlace algorithm matrix, and the intersection of all business is all passed through this cross matrix and realized.In this system, other high-order intersection of AU-4 level adopts the mode of a plurality of low order channels bindings to realize, also can realize the scheduling of all access service on the TU rank.But, use full low order interlace algorithm matrix to carry out service dispatching obviously, can only realize lower system's cross-capacity, can not satisfy the needs of future development.
Along with the development of network and video technique, in low-order service, with increasing, Virtual network operator still can require system can provide a certain amount of TU-12 grade other service dispatching ability simultaneously by the shared ratio of TU-3 loaded service dispatching requirement.If adopt chi structure design system shown in Figure 4, TU-3 can not separate with other low-order service of TU-12 grade, the low order interlace algorithm matrix is supported TU-3 and TU-12 simultaneously on the SDH equipment, the low order interlace algorithm matrix need design by the granularity of TU-12, therefore, realize the just necessary intersection that realizes 21 TU-12 passages synchronously of intersection of a TU-3 passage.In the time of the increase in demand that intersects as TU-3, true extension be the crossing of TU-12, so just increased the complexity that realizes extensive TU-3 rank intersection.And TU-3 and other cross business of TU-12 level all will take the passage of high-order cross matrix, not only make system will be subjected to great restriction to the scheduling amount of TU-3 business, and other high-order service accessibility of AU-4 level is affected.Therefore, the professional intersection of existing low-order and high-order implementation can't satisfy the service dispatching demand of present and following SDH transmission system low-costly and efficiently.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of professional method of intersecting that realizes, can finish other service dispatching of TU-3 level in the high-order cross matrix, thereby enlarge the dispatching of TU-3 level traffic.
Another object of the present invention is to provide a kind of professional system of intersecting that realizes, in the high-order cross matrix of native system, can carry out other professional intersection of TU-3 level, thereby enlarged the professional crossing of system.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses a kind of professional method of intersecting that realizes, carry out the AU-4 traffic frame that the TU-3 level traffic is intersected for preparing, this method may further comprise the steps:
A. described AU-4 traffic frame being carried out LOPA handles;
B. AU-PTR in the AU-4 traffic frame and high-order POH are duplicated;
C. the AU-4 traffic frame is separated byte intertexture division multiplexing and be as the criterion the AU-3 traffic frame to carry out other intersection of AU-3 level, byte intertexture division multiplexing is an AU-4 traffic frame structure again;
D. the AU-4 traffic frame behind the byte intertexture division multiplexing is carried out AU-PTR and recover and high-order POH Regeneration Treatment, revert to standard A U-4 traffic frame and output.
Wherein, this method comprises that further the AU-4 traffic frame that preparation is carried out AU-4 level traffic intersection carries out AU-4 rank intersection.
Wherein in, this method further comprises:
A1. carry out LOPA and handle preparing to carry out AU-4 traffic frame that the following rank of TU-3 intersects;
B1. Administrative Unit Pointer AU-PTR in the AU-4 traffic frame and higher order path monitoring expense POH are duplicated;
C1. the AU-4 traffic frame is separated byte intertexture division multiplexing and be as the criterion the AU-3 traffic frame, carry out the following rank of corresponding TU-3 and intersect, pass through other intersection of AU-3 level again, and byte intertexture division multiplexing is an AU-4 traffic frame structure to carry out other intersection of AU-3 level;
D1. the AU-4 traffic frame behind the byte intertexture division multiplexing is carried out AU-PTR and recover and high-order POH Regeneration Treatment, revert to standard A U-4 traffic frame and output.
Wherein, this method comprises that further the traffic frame that preparation is carried out the following rank intersection of TU-3 carries out the LOPA processing, after the high-order cross processing, carries out the following rank of corresponding TU-3 and intersects then, carries out high-order POH again after the high-order intersection and regenerates; Perhaps,
The traffic frame that the following rank intersection of TU-3 is carried out in preparation carries out the LOPA processing after the high-order cross processing, carry out the following rank of corresponding TU-3 then and intersect, and carries out high-order POH regeneration again after the high-order cross processing.
Wherein, described high-order intersection is: AU-4 or AU-3 rank are intersected.
Wherein, the following rank intersection of described TU-3 is: TU-2, TU-12 or TU-11 rank are intersected.
Among the step b, the process that described AU-PTR duplicates is: the H1 byte of AU-PTR in the AU-4 frame is copied to the position of Y, Y byte, the H2 byte is copied to 1
*, 1
*The position of byte; In the steps d, the process that described AU-PTR recovers is: second, third byte among the AU-PTR is replaced with two Y, the 5th, the 6th byte is replaced with two 1
*
Among the step b, the process that described high-order POH duplicates is: the position that POH in the AU-4 frame is copied to the fixing pseudo-random information R that inserts of two row; Perhaps,
The H4 byte of POH in the AU-4 frame is copied among the fixing pseudo-random information R that inserts of two row position with delegation.
Wherein, after the described high-order POH regeneration of steps d, further comprise: behind described high-order POH, fill two row pseudo-random information R.
The invention also discloses a kind of professional system of intersecting that realizes, comprising: AU-3 high-order cross matrix, LOPA module is characterized in that this system also comprises:
Administrative Unit Pointer AU-PTR and higher order path monitoring expense POH replication module is used for AU-PTR and high-order POH from the AU-4 traffic frame of LOPA module are duplicated and export to AU-3 high-order cross matrix;
Described AU-3 high-order cross matrix is used for separating byte intertexture division multiplexing from the AU-4 traffic frame structure of AU-PTR and high-order POH replication module, carries out the AU-3 rank and intersects, and byte intertexture division multiplexing is AU-4 traffic frame structure and output again;
AU-PTR recovers and high-order POH regeneration module, is used to receive the AU-4 traffic frame structure of AU-3 high-order cross matrix output, to this AU-4 traffic frame structure carry out that the AU-PTR reference format recovers and high-order POH Regeneration Treatment after, outputting standard AU-4 traffic frame.
Wherein, described AU-PTR recovery and high-order POH regeneration module comprise: high-order POH regeneration module and the AU-PTR recovery module that is used for the AU-PTR of AU-4 traffic frame is reverted to reference format;
Described AU-PTR recovers module and export high-order POH regeneration module to after AU-3 high-order cross matrix receives AU-4 traffic frame structure treatment; Perhaps,
Described high-order POH regeneration module exports AU-PTR to and recovers module after AU-3 high-order cross matrix receives AU-4 traffic frame structure treatment.
Wherein, this system further comprises:
The low order interlace algorithm matrix is used for receive preparing to carry out traffic frame that the following rank of TU-3 intersects from AU-3 high-order cross matrix and carries out corresponding level and intersect and export AU-3 high-order cross matrix to.
Wherein, this system further comprises: be used to handle another LOPA module and another high-order POH regeneration module that the traffic frame of the following rank intersection of TU-3 is carried out in preparation; Described another high-order POH regeneration module receives traffic frame from AU-3 high-order cross matrix and handles outputting standard AU-4 traffic frame afterwards;
Described another LOPA module receives preparation and carries out exporting AU-3 high-order cross matrix to after the traffic frame of the following rank intersection of TU-3 is handled; Perhaps,
Described another LOPA module receives traffic frame from AU-3 high-order cross matrix and exports the low order interlace algorithm matrix to.
Wherein, the following rank intersection of described TU-3 is: TU-2, TU-12 or TU-11 rank are intersected.
By such scheme as can be seen, key of the present invention is: the AU-4 traffic frame that preparation is carried out TU-3 rank intersection carries out duplicating of AU-PTR and high-order POH to it after handling through LOPA; Thereby intersect by carry out the AU-3 rank at AU-3 high-order cross matrix, realized the exchange of TU-3 rank payload user data; And after intersection output, carry out AU-PTR recovery and high-order POH regeneration, obtain standard A U-4 traffic frame and carry out subsequent treatment.
Therefore, the method and system that realize professional intersection provided by the present invention, can in AU-3 high-order cross matrix, realize other service dispatching of TU-3 level, when needs carry out TU-3 intersection and TU-2/TU-12/TU-11 rank intersection simultaneously, the TU-3 rank intersects at the high-order cross matrix and carries out, thereby the resource that has made full use of the high-order cross matrix realizes that TU-3 intersects, and has improved the cross-capacity and the TU-3 rank dispatching of whole system.And expand other cross-capacity of TU-3 level if desired, only the high-order cross matrix is expanded getting final product, thereby the system that is easy to carries out dilatation to TU-3 rank intersection.
Description of drawings
Fig. 1 is the G.707 multiplexing mapping structure schematic diagram of ITU-T regulation;
Fig. 2 advances a kind of multiplexing route schematic diagram of STM-N signal for 34Mbits/s signal multiplexing in the multiplexing structure shown in Figure 1;
Fig. 3 advances the another kind of multiplexing route schematic diagram of STM-N signal for 34Mbits/s signal multiplexing in the multiplexing structure shown in Figure 1;
Fig. 4 realizes block diagram for the professional low-order and high-order dispatching patcher of existing SDH;
Fig. 5 realizes block diagram for the professional low-order and high-order dispatching patcher of SDH of the present invention;
Fig. 6 is the inventive method one preferred embodiment handling process schematic diagram;
Fig. 7 is standard A U-4 and the AU-3 frame structure schematic diagram of SDH;
Fig. 8 is through AU-4 and accurate AU-3 frame structure schematic diagram after AU-PTR of the present invention and the high-order POH replication processes.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
The invention provides a kind of professional method of intersecting that realizes, carry out the administrative unit AU-4 traffic frame that the TU-3 level traffic is intersected for preparing, this method comprises:
A. described AU-4 traffic frame being carried out LOPA handles;
B. carry out AU-PTR and high-order POH duplicates;
C. separate the byte intertexture division multiplexing AU-3 traffic frame that is as the criterion and carry out other intersection of AU-3 level, byte intertexture division multiplexing is an AU-4 traffic frame structure again;
D. carry out AU-PTR and recover and high-order POH Regeneration Treatment, revert to standard A U-4 traffic frame and output.
In order to realize this method, the present invention also provides a kind of professional system of intersecting that realizes, comprising: AU-3 high-order cross matrix, LOPA module, this system also comprises: AU-PTR and high-order POH replication module and AU-PTR recover and high-order POH regeneration module.
Fig. 5 realizes block diagram for the professional low-order and high-order dispatching patcher of SDH of the present invention.Wherein, the function of LOPA module is described identical with background technology, and the AU-4 traffic frame that the TU-3 intersection is carried out in the reception preparation carries out LOPA processing and output; AU-PTR and high-order POH replication module are used for receiving the AU-4 traffic frame from the LOPA module, and AU-PTR in this AU-4 frame and high-order POH are duplicated and export; AU-3 high-order cross matrix is separated byte intertexture division multiplexing and is carried out the AU-3 intersection from AU-PTR and high-order POH replication module reception AU-4 traffic frame structure, and byte intertexture division multiplexing is the output of AU-4 traffic frame structure again; AU-PTR recovers and high-order POH regeneration module, is used for receiving AU-4 traffic frame structure from AU-3 high-order cross matrix and carries out processing and the output that AU-PTR recovers and high-order POH byte is regenerated.
Here, described AU-PTR recovery and high-order POH regeneration module comprise: the AU-PTR recovery module and the existing high-order POH regeneration module that are used for AU-PTR is reverted to reference format.Described AU-PTR recovers module and high-order POH regeneration module, can be integrated into same entity and simultaneously traffic frame be handled; Also can distinguish separately and to be provided with, perhaps AU-PTR recovers module and at first receives traffic frame and export high-order POH regeneration module to after handling, and perhaps high-order POH regeneration module at first receives traffic frame and handles and export AU-PTR again to and recover module.
In the system of the present invention, if will carry out other professional intersection of AU-4 level simultaneously, then described AU-4 high-order cross matrix also receives simultaneously and prepares to carry out the AU-4 traffic frame that AU-4 intersects, and as stated in the Background Art 3 AU-3 passage binding carrying out AU-4 in the AU-3 high-order cross matrix is intersected and output.
In addition, according to the service dispatching demand, if will carry out the following rank of TU-3 simultaneously promptly, other professional intersection of TU-2/TU-12/TU-11 level, then this system also further comprises the low order interlace algorithm matrix, its function is described identical with background technology, receives from AU-3 high-order cross matrix and prepares to carry out the AU-4 traffic frame that the TU-2/TU-12/TU-11 level traffic is intersected, and it is carried out the TU-2/TU-12/TU-11 intersection export AU-3 high-order cross matrix again to.Here, before entering the low order interlace algorithm matrix, also to carry out the LOPA processing owing to carry out the business of TU-2/TU-12/TU-11 intersection, the business of carrying out TU-2/TU-12/TU-11 rank intersection can be inputed to LOPA module and AU-PTR and high-order POH replication module with the business of carrying out TU-3 rank intersection handles, and then entering AU-3 high-order cross matrix and low order interlace algorithm matrix, this scheme is changed minimum to existing SDH low-order and high-order cross system; Also can independently carry out as stated in the Background Art processing to the TU-2/TU-12/TU-11 cross business, that is: perhaps be provided with before entering AU-3 high-order cross matrix or before entering the low order interlace algorithm matrix special LOPA module to TU-2/TU-12/TU-11 cross business handle, and special high-order POH regeneration module be set handle from the traffic frame of AU-3 high-order cross matrix output finishing TU-2/TU-12/TU-11 rank low order interlace algorithm.Concrete which kind of mode that adopts realizes other professional intersection of TU-2/TU-12/TU-11 level, and the present invention does not limit, but all in protection scope of the present invention.
In the said system, before the business input, system is according to each passage carried out in pre-configured high-order cross matrix of service dispatching demand and the low order interlace algorithm matrix intersection rank, that is: which passage carries out the AU-4 intersection, which passage carries out AU-3 and intersects or the like, and system will handle accordingly by this configuration.In addition, AU-3 high-order cross matrix passage corresponding LOPA module, AU-PTR and a high-order POH replication module, an AU-PTR recover and high-order POH regeneration module and/or high-order POH regeneration module in actual implementation procedure, it shown in Fig. 5 the expression in logic of described each module, such as: the LOPA module among the figure is logical expressions, physically, its actual a plurality of LOPA modules that comprise a plurality of passage correspondences, but do not influence validity of the present invention.
Based on the invention described above system, the processing of the inventive method is described in detail below in conjunction with Fig. 6 to Fig. 8.
Fig. 6 is the inventive method one preferred embodiment handling process schematic diagram.As shown in Figure 6, comprise that step is as follows:
Step 601: the AU-4 traffic frame that preparation is carried out TU-3 level traffic intersection carries out the LOPA processing, thereby makes the AU-PTR of each traffic frame and multi-frame indicate in full accord.
Here, the indication of described multi-frame is in AU-4 shown in Figure 7 and the AU-3 standard frame, and Far Left one row are the H4 byte among the POH among the payload user data VC-4 of AU-4, is used in reference to be shown with to imitate the multi-frame classification of loading and the position of TU-3 net load.
Among Fig. 7, the POH of AU-4 and AU-3 is respectively applied for VC-4 and VC-3 passage situation is monitored.After the AU-4 traffic frame was handled through LOPA, the indicated value of the AU-PTR of each AU-4 frame and H4 byte was consistent, and then other byte among the POH promptly: J1, B3, C2, G1, F2, F3, K3, N1 have just lost indicative significance.
Step 602: the AU-4 traffic frame structure after handling through LOPA is carried out AU-PTR and high-order POH duplicates, that is: H1, the H2 of AU-PTR in the AU-4 frame shown in Figure 7 copied to the position of Y, Y, 1*, 1*, and POH is copied to the position of the fixing pseudo-random information R that inserts of two row.Here, the value of described Y is 0x9B, and the value of described 1* is 0xFF.
Through after this step process, the AU-4 frame structure as shown in Figure 8.In the AU-4 frame structure shown in Figure 8, H1, H2 have been copied to Y, Y, 1*, 1* position, and H4 also has been copied among the fixing pseudo-random information R that inserts of two row the position with delegation.Because except that H4, other byte has lost indicative significance among the POH of the AU-4 traffic frame that process LOPA handles, therefore, in the row at 3 H4 places, the byte except that H4 all uses " * " to represent among Fig. 8, and proof system need not to discern the indicated value of current these bytes.Like this, to all bytes that duplicating of high-order POH can be duplicated this POH, can only duplicate the H4 byte yet, all can realize the same technique effect that gets, the present invention does not limit.
Step 603: the described AU-4 traffic frame of step 602 structure enters AU-3 high-order cross matrix and carries out AU-3 level traffic intersection.By the multiplexing route of AU-3 to AU-4 in the background technology as can be known, 3 AU-3 byte intertexture division multiplexings obtain the AU-4 frame structure, therefore, when the AU-4 traffic frame carries out the AU-3 level traffic when intersecting, need separate byte intertexture division multiplexing and intersect.
Here, the AU-4 frame structure that duplicates through LOPA, AU-PTR and high-order POH among Fig. 8 is separated after the byte intertexture division multiplexing, can obtain the accurate AU-3 frame structure of 3 shown in Fig. 8, this accurate AU-3 frame and standard A U-3 frame sign shown in Figure 7 are identical, but, its low order channel is TUG-3 the but not therefore VC-3 of standard A U-3 low order channel, is called accurate AU-3 here.As shown in Figure 8, comprise AU-PTR:H1, H2, H3 among this accurate AU-3, can correctly indicate the position of its inner TUG-3, and the AU-PTR of each accurate AU-3 carries out having finished when LOPA handles registration process in front, indicated value is identical, thereby this accurate AU-3 can finish the exchange of TUG-3 in AU-3 intersects.
By the internal structure of the described TUG-3 of background technology as seen, the payload user data of TUG-3 is the payload user data of TU-3, also just finished other service dispatching of TU-3 level when therefore in this step, the present invention has finished the exchange of TUG-3 in other high-order cross matrix of AU-3 level.
Step 604: after other intersects through the AU-3 level, each accurate AU-3 traffic frame is that unit carries out byte intertexture division multiplexing with 3, obtain AU-4 traffic frame structure shown in Figure 8, then this AU-4 frame structure is carried out the processing that AU-PTR recovers and high-order POH regenerates, thereby obtain standard A U-4 traffic frame as shown in Figure 7 again.
Wherein, the method that described AU-PTR recovers is: in the AU-PTR of AU-4 shown in Figure 8, two H1 and two H2 bytes that will be positioned at the right replace with two Y and two 1* respectively again, second, third byte are replaced with two Y that is:, and the 5th, the 6th byte is replaced with two 1*; The method of described high-order POH regeneration is a known technology, therefore is not described further.Here, consider the value that two row pseudo-random information R of the fixedly insertion on POH the right may exist in subsequent treatment, the present invention also can refill two row pseudo-random information R in the POH the right at AU-4 shown in Figure 8 when the POH byte of AU-4 is regenerated.
In addition, in the inventive method, the traffic frame that carries out AU-4 rank intersection directly enters the high-order cross matrix as stated in the Background Art, 3 AU-3 passages is tied up the intersection that realizes an AU-4 passage; Carrying out other low order interlace algorithm business of TU-2/TU-12/TU-11 level can be as stated in the Background Art: perhaps carry out high-order and carry out LOPA before intersecting and handle entering AU-3 high-order cross matrix, perhaps carrying out LOPA before entering the low order interlace algorithm matrix handles, carry out the low order interlace algorithm of TU-2/TU-12/TU-11 then, enter the high-order cross matrix again and carry out high-order and export high-order POH regeneration module to after intersecting and handle.Wherein, realize that in order to make cost is minimum, and to the existing improvement minimum of handling, can also will prepare to carry out AU-4 traffic frame that the TU-2/TU-12/TU-11 rank intersects and carry out one on the AU-4 traffic frame structure that the TU-3 rank intersects and carry out the processing that LOPA and AU-PTR and high-order POH duplicate, separating byte intertexture division multiplexing through AU-3 high-order cross matrix then is described accurate AU-3 frame structure, carry out entering the low order interlace algorithm that the low order interlace algorithm matrix is finished corresponding level after the AU-3 rank intersection, enter AU-3 high-order cross matrix from the low order interlace algorithm matrix again and carry out AU-3 rank intersection, and byte intertexture division multiplexing exports the AU-PTR recovery to for the AU-4 frame structure and high-order POH regeneration module is handled.
Here, described AU-PTR and high-order POH replication module, LOPA module, AU-3 high-order cross matrix, low order interlace algorithm matrix and AU-PTR recover and high-order POH regeneration module is that AU-4/AU-3 traffic frame structure is handled in essence, in actual process, the traffic frame that enters cross matrix is the STM-N signal often, cross matrix will be separated byte intertexture division multiplexing with traffic frame according to the speed of input/output bus and become AU-4/AU-3 traffic frame structure to intersect, and byte intertexture division multiplexing is the output of STM-N signal again; The traffic frame that enters the LOPA module was the AU-4/AU-3 traffic frame by demultiplexing before entering the LOPA module of each cross aisle, and had been multiplexed with the STM-N signal after the LOPA module output of each cross aisle; Because the characteristic of SDH is that traffic frame is a byte intertexture division multiplexing, can handle simultaneously a plurality of AU-4 frame structures of multiplexing STM-N signal form according to multiplexed situation when therefore AU-PTR and high-order POH replication module and AU-PTR recovery and high-order POH regeneration module are handled, such as: for the STM-4 traffic frame of 4 AU-4 frame structure byte intertexture division multiplexings formation, can the AU-PTR and the high-order POH of middle 4 the AU-4 frames that are plugged together of this STM-4 traffic frame be handled simultaneously, do not influence the validity of processing.
By the described processing of Fig. 6 as seen, use the inventive method other business of TU-3 level can be intersected at the high-order cross matrix and carry out, thereby the TU-3 rank is intersected and needn't be carried out in the low order interlace algorithm matrix.Like this, when needs carry out TU-3 intersection and TU-2/TU-12/TU-11 rank intersection simultaneously, the TU-3 rank intersects at the high-order cross matrix and carries out, the resource that has made full use of the high-order cross matrix realizes that TU-3 intersects, expand other cross-capacity of TU-3 level if desired, only the high-order cross matrix is expanded and got final product, thereby the system that is easy to carries out dilatation to TU-3 rank intersection, in addition, the low order interlace algorithm matrix needn't carry out TU-3 and intersect, and has also improved the crossing of TU-2/TU-12/TU-11 business greatly.
In sum, use the inventive method and system, can utilize AU-3 high-order cross matrix to realize TU-3 level traffic intersection, thereby improved the dispatching of the TU-3 level traffic of whole SDH system greatly in simple mode, satisfy the needs of future network development, technical solutions according to the invention are equally applicable to Synchronous Optical Network (SONET) system simultaneously.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all be included in of the present invention comprising in the scope.
Claims (14)
1, a kind of method that realizes professional intersection is characterized in that, carries out the administrative unit AU-4 traffic frame that tributary unit TU-3 level traffic is intersected for preparing, and this method may further comprise the steps:
A. described AU-4 traffic frame being carried out low order channel alignment LOPA handles;
B. Administrative Unit Pointer AU-PTR in the AU-4 traffic frame and higher order path monitoring expense POH are duplicated;
C. the AU-4 traffic frame is separated byte intertexture division multiplexing and be as the criterion the AU-3 traffic frame to carry out other intersection of AU-3 level, byte intertexture division multiplexing is an AU-4 traffic frame structure again;
D. the AU-4 traffic frame behind the byte intertexture division multiplexing is carried out AU-PTR and recover and high-order POH Regeneration Treatment, revert to standard A U-4 traffic frame and output.
2, method according to claim 1 is characterized in that, this method comprises that further the AU-4 traffic frame that preparation is carried out AU-4 level traffic intersection carries out AU-4 rank intersection.
3, method according to claim 1 is characterized in that, this method further comprises:
A1. carry out LOPA and handle preparing to carry out AU-4 traffic frame that the following rank of TU-3 intersects;
B1. Administrative Unit Pointer AU-PTR in the AU-4 traffic frame and higher order path monitoring expense POH are duplicated;
C1. the AU-4 traffic frame is separated byte intertexture division multiplexing and be as the criterion the AU-3 traffic frame, carry out the following rank of corresponding TU-3 and intersect, pass through other intersection of AU-3 level again, and byte intertexture division multiplexing is an AU-4 traffic frame structure to carry out other intersection of AU-3 level;
D1. the AU-4 traffic frame behind the byte intertexture division multiplexing is carried out AU-PTR and recover and high-order POH Regeneration Treatment, revert to standard A U-4 traffic frame and output.
4, method according to claim 1, it is characterized in that, this method further comprises, the traffic frame that preparation is carried out the following rank intersection of TU-3 carries out the LOPA processing, then after the high-order cross processing, carry out the following rank of corresponding TU-3 and intersect, after high-order intersects, carry out high-order POH regeneration again; Perhaps,
The traffic frame that the following rank intersection of TU-3 is carried out in preparation carries out the LOPA processing after the high-order cross processing, carry out the following rank of corresponding TU-3 then and intersect, and carries out high-order POH regeneration again after the high-order cross processing.
5, method according to claim 4 is characterized in that, described high-order intersection is: AU-4 or AU-3 rank are intersected.
According to each described method of claim 3 to 5, it is characterized in that 6, the following rank intersection of described TU-3 is: TU-2, TU-12 or TU-11 rank are intersected.
7, according to each described method of claim 1 to 5, it is characterized in that,
Among the step b, the process that described AU-PTR duplicates is: H 1 byte of AU-PTR in the AU-4 frame is copied to the position of Y, Y byte, the H2 byte is copied to 1
*, 1
*The position of byte;
In the steps d, the process that described AU-PTR recovers is: second, third byte among the AU-PTR is replaced with two Y, the 5th, the 6th byte is replaced with two 1
*
According to each described method of claim 1 to 5, it is characterized in that 8, among the step b, the process that described high-order POH duplicates is: the position that POH in the AU-4 frame is copied to the fixing pseudo-random information R that inserts of two row; Perhaps,
The H4 byte of POH in the AU-4 frame is copied among the fixing pseudo-random information R that inserts of two row position with delegation.
9, method according to claim 8 is characterized in that, after the described high-order POH regeneration of steps d, further comprises: fill two row pseudo-random information R behind described high-order POH.
10, a kind of system that realizes professional intersection, comprising: AU-3 high-order cross matrix, LOPA module is characterized in that this system also comprises:
Administrative Unit Pointer AU-PTR and higher order path monitoring expense POH replication module is used for AU-PTR and high-order POH from the AU-4 traffic frame of LOPA module are duplicated and export to AU-3 high-order cross matrix;
Described AU-3 high-order cross matrix is used for separating byte intertexture division multiplexing from the AU-4 traffic frame structure of AU-PTR and high-order POH replication module, carries out the AU-3 rank and intersects, and byte intertexture division multiplexing is AU-4 traffic frame structure and output again;
AU-PTR recovers and high-order POH regeneration module, is used to receive the AU-4 traffic frame structure of AU-3 high-order cross matrix output, to this AU-4 traffic frame structure carry out that the AU-PTR reference format recovers and high-order POH Regeneration Treatment after, outputting standard AU-4 traffic frame.
11, system according to claim 10 is characterized in that, described AU-PTR recovers and high-order POH regeneration module comprises: high-order POH regeneration module and the AU-PTR recovery module that is used for the AU-PTR of AU-4 traffic frame is reverted to reference format;
Described AU-PTR recovers module and export high-order POH regeneration module to after AU-3 high-order cross matrix receives AU-4 traffic frame structure treatment; Perhaps,
Described high-order POH regeneration module exports AU-PTR to and recovers module after AU-3 high-order cross matrix receives AU-4 traffic frame structure treatment.
12, system according to claim 10 is characterized in that, this system further comprises:
The low order interlace algorithm matrix is used for receive preparing to carry out traffic frame that the following rank of TU-3 intersects from AU-3 high-order cross matrix and carries out corresponding level and intersect and export AU-3 high-order cross matrix to.
13, system according to claim 12 is characterized in that, this system further comprises: be used to handle another LOPA module and another high-order POH regeneration module that the traffic frame of the following rank intersection of TU-3 is carried out in preparation; Described another high-order POH regeneration module receives traffic frame from AU-3 high-order cross matrix and handles outputting standard AU-4 traffic frame afterwards;
Described another LOPA module receives preparation and carries out exporting AU-3 high-order cross matrix to after the traffic frame of the following rank intersection of TU-3 is handled; Perhaps,
Described another LOPA module receives traffic frame from AU-3 high-order cross matrix and exports the low order interlace algorithm matrix to.
14, the system that states according to claim 12 or 13 is characterized in that, the following rank intersection of described TU-3 is: TU-2, TU-12 or TU-11 rank are intersected.
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