CN103561359A - Multiple connection method and device for optical channel data unit - Google Patents
Multiple connection method and device for optical channel data unit Download PDFInfo
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Abstract
The invention discloses a multiple connection method for an optical channel data unit. The method includes the steps that a shared data cache is adopted to preserve a low order ODU data stream and dynamically allocates caching spaces matched with the bandwidths of low order ODUs for the low order ODUs; multichannel low order ODU data contained in the ODU data stream are respectively mapped into multichannel ODTU data in a time division mode; multiple connection is carried out on the multichannel ODTU data to enable the multichannel ODTU data to become high order ODU data with interleaved space division bytes. The embodiment of the invention further provides a multiple connection device. According to the technical schemes of the method and device, dynamic changes of channel bandwidths can be supported; under the circumstance that clock frequency is not increased, logical resources processed by channels can be fully shared and multiplexed to the maximum, and demands of the logical resources can be linearly increased according to the service total bandwidth; physical implementation risks such as timing sequence tension and jamming do not exist.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of multiple connection method and apparatus of Optical Channel Data Unit-k.
Background technology
OTN(Optical Transport Network, optical transfer network) be to take wavelength-division multiplex technique as basis, in the transport network of photosphere organization network.The signal transmission of OTN, need to shine upon processing to client signal, from low order ODU(Optical channel Data Unit, Optical Channel Data Unit-k) to high-order ODU, final OTU(Optical channel Transport Unit, the optical channel transmission unit of forming) send.Along with OTN transmission rate improves constantly, mapping path increases, in the transfer process of multichannel low order ODU and high-order ODU, in the high-order ODU frame structure that the low order ODU data multiplexing of time-division need to be interleave to sky minute byte, and the data solution multiple connection that high-order ODU frame structure hollow minute byte is interleave goes out the time divided data of low order ODU.It is the major function that multiple connection is conciliate in multiple connection that space-time divides conversion logic, determines whole logical complexity and cost power consumption.
Fig. 1 shows a kind of multichannel low price ODU to the multiple connection method of high-order ODU, comprise: multichannel low order ODU enters respectively different FIFO(First in first out, first-in first-out) buffer memory, enter again corresponding multiple connection (Mutiplex, MUX) unit shines upon and data selection, complete space-time and divide conversion, form high-order ODU Frame.Wherein, the MUX unit that each FIFO buffer memory is corresponding with it is a data processing channel.In the method, interchannel can not shared buffer memory and logical resource, and when only having several roads at a low price during ODU, the buffer memory of most of passage and logical resource can be idle, cause resource consumption large, and power consumption is large, realizes cost high.
Fig. 2 shows another kind of multichannel, and ODU is to the multiple connection method of high-order ODU at a low price, and the method is carried out buffer memory according to time slot, and low order ODU first selects to enter which time slot, then enters corresponding FIFO buffer memory, completes space-time and divides conversion, forms high-order ODU Frame.The method is pressed time slot storage, can save cache resources.But, if save the logical resource of data selection, need to improve clock frequency.And improve clock frequency, can cause power consumption to increase, timing closure difficulty, and be also not easy physically to realize.In addition, the method is pressed time slot storage, has brought buffer memory switching, the risk that data move in and out.
Summary of the invention
The embodiment of the present invention provides a kind of multiple connection method of Optical Channel Data Unit-k, to solve existing multiple connection method, has above-mentioned technical problem.The embodiment of the present invention also provides corresponding device.
First aspect present invention provides a kind of multiple connection method of Optical Channel Data Unit-k, comprise: adopt and share data buffer storage preservation low order ODU data flow, described shared data buffer storage is the spatial cache that each low order ODU dynamic assignment is mated with the amount of bandwidth of described low order ODU; The multichannel low order ODU data that described ODU data flow is comprised are mapped as respectively multi-path light channel data tributary unit ODTU data by time division way; The high-order ODU data that described multichannel ODTU data multiplexing is interleave for empty minute byte.
In the possible implementation of the first, described is that the high-order ODU data that empty minute byte interleaves comprise by described multichannel ODTU data multiplexing: each byte of multichannel ODTU data is write in cache module; The ODTU data that write in cache module are carried out to transposition; ODTU data after transposition are carried out to a sky minute byte and interleave, obtain high-order ODU data.
In conjunction with the possible implementation of the first of first aspect, in the possible implementation of the second, described cache module comprises the first cache module and the second cache module; Described each byte by multichannel ODTU data writes cache module and comprises: according to control signal ab_sel, determine each byte of ODTU data is write to the first or second cache module; According to control signal addr, determine that each byte writes determined first or the particular location of the second cache module.
In conjunction with the possible implementation of the first of first aspect, in the third possible implementation, bit wide of each line display of the ODTU data after transposition, a time slot is shown in each list; Describedly ODTU data after transposition are carried out to a sky minute byte interleave and comprise: described the first cache module is divided into n the first buffer unit, described the second cache module is divided into individual the second buffer unit of n, n is natural number; Described n the first buffer unit and n the second buffer unit are divided into n group according to demand, and each group comprises first buffer unit and second buffer unit; Each row ODTU data of the first buffer unit of each group and the second buffer unit are carried out to a sky minute byte to be interleave.
Second aspect present invention provides a kind of multiple devices of Optical Channel Data Unit-k, comprising: share data buffer storage, and for preserving low order ODU data flow, the spatial cache mating with the amount of bandwidth of described low order ODU for each low order ODU dynamic assignment; Data-mapping module, is mapped as respectively multi-path light channel data tributary unit ODTU data for the multichannel low order ODU data that described ODU data flow is comprised by time division way; Space-time divides modular converter, for the high-order ODU data that described multichannel ODTU data multiplexing is interleave for empty minute byte.
In the possible implementation of the first, described space-time divides modular converter to comprise: writing unit, for each byte of multichannel ODTU data is write to cache module; Transposition unit, for carrying out transposition to writing the ODTU data of cache module; An empty minute byte interleaves unit, carries out a sky minute byte interleave for the ODTU data to after transposition, obtains high-order ODU data.
In conjunction with the possible implementation of the first of second aspect, in the possible implementation of the second, described cache module comprises the first cache module and the second cache module; Said write unit, specifically for determining each byte of ODTU data write to the first or second cache module according to control signal ab_sel; According to control signal addr, determine that each byte writes determined first or the particular location of the second cache module.
In conjunction with the possible implementation of the first of second aspect, in the third possible implementation, bit wide of each line display of the ODTU data after transposition, a time slot is shown in each list; A described sky minute byte interleaves unit, specifically for described the first buffer unit being divided into n the first buffer unit, described the second cache module is divided into n the second buffer unit, and n is natural number; Described n the first buffer unit and n the second buffer unit are divided into n group according to demand, and each group comprises first buffer unit and second buffer unit; Each row ODTU data of the first buffer unit of each group and the second buffer unit are carried out to a sky minute byte to be interleave.
The embodiment of the present invention adopts technique scheme, has obtained following technique effect: can support bandwidth chahnel dynamically changeable; Can in the situation that not improve clock frequency, fully share, maximize cache resources and logical resource that multiplex channel is processed, make logical resource demand according to business total bandwidth linear growth; Do not exist sequential nervous, the congested physics realization risk that waits.
Accompanying drawing explanation
Fig. 1 is a kind of schematic diagram of existing ODU multiple connection method;
Fig. 2 is the schematic diagram of the multiple connection method of another kind of existing Optical Channel Data Unit-k;
Fig. 3 is the schematic diagram of the multiple connection method of a kind of ODU of providing of the embodiment of the present invention;
Fig. 4 writes ODTU data in the schematic diagram of cache module;
Fig. 5 is to be the schematic diagram of high-order ODU data by the ODTU data multiplexing after transposition;
Fig. 6 is the schematic diagram of the multiple devices of the Optical Channel Data Unit-k that provides of the embodiment of the present invention.
Embodiment
A kind of multiple connection method that the embodiment of the present invention provides the embodiment of the present invention that Optical Channel Data Unit-k is provided, can solve existing multiple connection method and have above-mentioned technical problem.The embodiment of the present invention also provides corresponding device.In order to make those skilled in the art person understand better the present invention program, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, should belong to the scope of protection of the invention.
Embodiment mono-,
Please refer to Fig. 3, the embodiment of the present invention provides the multiple connection method of a kind of Optical Channel Data Unit-k (ODU), and the method comprises:
110, adopt and share data buffer storage (Share Memory Date Buffer) preservation low order ODU data flow, described shared data buffer storage is the spatial cache that each low order ODU dynamic assignment is mated with the amount of bandwidth of described low order ODU.
In the present embodiment, adopt shared buffer memory mode to preserve low order ODU data flow.According to the amount of bandwidth of each low order ODU, for each low order ODU distributes the spatial cache of corresponding size, when low order ODU bandwidth changes, can dynamically adjust the spatial cache size of low order ODU, and not cause the damage of low order ODU data flow.
120, the multichannel low order ODU data that described ODU data flow comprised are mapped as respectively multichannel ODTU data by time division way.
For low speed service access is arrived to high speed business, that is, realize the multiple connection of ODU, generally need first low order ODU is fitted to ODTU(Optical channel Data Tributary Unit, optical channel data tributary unit), then ODTU is fitted to high-order ODU.In the present embodiment, adopt data-mapping module to realize multichannel low order ODU data are mapped as respectively to multichannel ODTU data by time division way.This data-mapping module can be supported multiple mapping mode by configuration, and each low order ODU can take processing resource according to bandwidth timesharing.
130, the high-order ODU data that described multichannel ODTU data multiplexing interleave for empty minute byte.
In the present embodiment, adopt space-time to divide modular converter, realize the high-order ODU data that the multichannel ODTU data multiplexing of time-division is interleave for empty minute byte.This space-time divides modular converter to support multiple high-order ODU structure by configuration.Concrete, each byte of multichannel ODTU data can be write in cache module; Then the ODTU data that write in cache module are carried out to transposition; By the ODTU data to after transposition, carry out a sky minute byte and interleave, obtain high-order ODU data.
Wherein, described cache module comprises the first cache module and the second cache module; Described each byte by multichannel ODTU data writes cache module and comprises: according to control signal ab_sel, determine each byte of ODTU data is write to the first or second cache module; According to control signal addr, determine that each byte writes determined first or the particular location of the second cache module.
Bit wide of each line display of ODTU data after transposition, a time slot is shown in each list; Describedly ODTU data after transposition are carried out to a sky minute byte interleave and can comprise: described the first cache module is divided into n the first buffer unit, described the second cache module is divided into individual the second buffer unit of n, n is natural number; Described n the first buffer unit and n the second buffer unit are divided into n group according to demand, and each group comprises first buffer unit and second buffer unit; Each row ODTU data of the first buffer unit of each group and the second buffer unit are carried out to a sky minute byte to be interleave.
Below, illustrate, by ODTU data multiplexing, be how the high-order ODU data that empty minute byte interleaves realize.
First, ODTU data are write to cache module.Suppose to write the ODTU data that side comprises 40 bytes (Byte, B).As shown in Figure 4, can determine each byte of these 40 byte ODTU data is write to the first or second cache module according to control signal ab_sel, the particular location that each byte writes be determined by control signal addr.In Fig. 4, with A, represent the first cache module, with B, represent the second mould cache blocks, described cache module can be called A/B cache module.In the first or second cache module, including the buffer memory matrix of 40 * 80, wherein, is laterally 40 bit wides, with 0B-39B, represents; Be longitudinally 80 time slots (Time Slot), with 0-79, represent.
Then, from A/B cache module, read ODTU data, and carry out data transposition.The horizontal expression time slot of the ODTU data after transposition, longitudinally represents bit wide.In concrete application, A/B cache module can adopt alternating mode read-write ODTU data, reads B while writing A, writes B after writing A, reads A while writing B.After being write, A or B just can carry out data transposition.
As shown in Figure 5, the first cache module can be divided into 0A to 9A totally 10 the first buffer units, the second cache module is divided into 0B to 9B totally 10 the second buffer units; Each buffer unit laterally have 40 time slots, longitudinally have 8 bit wides.As required, the first buffer unit and the second buffer unit are matched to grouping, respectively by not on the same group the ODTU data of buffer unit be input to different multiple connection (Mutiplex, MUX) unit carries out multiple connection, the 40B high-order ODU data that the sky minute byte that finally obtains being comprised of 5 road 8B data interleaves.As shown in Figure 5, in said process, can be controlled by half_sel top or the bottom of sense data, by ab_sel, control and read from A buffer unit or B buffer unit, by addr, control the position that each byte is read.
In this example, the first and second cache modules are divided into respectively 10 independently buffer unit work, in this execution mode, by combination buffer unit co-operation, to support different high-order ODU frame structures.The principle of grouping, in order to support different high-order frame structures, in this example, being divided into 10 groups is in order to support the high-order ODU2 of 10 road 10G bandwidth, also supports the high-order ODU3 of 2 road 40G or the high-order ODU4 of 1 road 100G simultaneously, and their minimum particle size is all the integral multiple of 10G.
Above, the multiple connection method of the ODU embodiment of the present invention being provided is illustrated.This method is applicable to the scene that the wide data streaming service of multichannel small band is multiplexed into 1 road or the large band data stream of multichannel business.
The embodiment of the present invention adopts technique scheme, has obtained following technique effect:
Support bandwidth chahnel dynamically changeable, can be by bandwidth sharing, dynamic lossless distributes buffer memory;
In the situation that not improving clock frequency, fully share, maximize cache resources and logical resource that multiplex channel is processed;
In the situation that clock frequency is constant, make logical resource demand according to business total bandwidth linear growth;
Do not exist sequential nervous, the congested physics realization risk that waits.
Embodiment bis-,
Please refer to Fig. 6, the embodiment of the present invention provides a kind of multiple devices of Optical Channel Data Unit-k, comprising:
Share data buffer storage 210, for preserving low order ODU data flow, this shared data buffer storage 210 can be the spatial cache that each low order ODU dynamic assignment is mated with the amount of bandwidth of described low order ODU;
Data-mapping module 220, is mapped as respectively multi-path light channel data tributary unit (ODTU) data for the multichannel low order ODU data that described ODU data flow is comprised by time division way;
Space-time divides modular converter 230, for the high-order ODU data that described multichannel ODTU data multiplexing is interleave for empty minute byte.
Can select, described space-time divides modular converter 230 specifically can comprise:
Writing unit, for writing cache module by each byte of multichannel ODTU data;
Transposition unit, for carrying out transposition to writing the ODTU data of cache module;
An empty minute byte interleaves unit, carries out a sky minute byte interleave for the ODTU data to after transposition, obtains high-order ODU data.
Optionally, described cache module comprises the first cache module and the second cache module; Said write unit, specifically for determining each byte of ODTU data write to the first or second cache module according to control signal ab_sel; According to control signal addr, determine that each byte writes determined first or the particular location of the second cache module.
Optionally, bit wide of each line display of the ODTU data after transposition, a time slot is shown in each list; A described sky minute byte interleaves unit, specifically for described the first cache module being divided into n the first buffer unit, described the second cache module is divided into n the second buffer unit, and n is natural number; Described n the first buffer unit and n the second buffer unit are divided into n group according to demand, and each group comprises first buffer unit and second buffer unit; Each row ODTU data of the first buffer unit of each group and the second buffer unit are carried out to a sky minute byte to be interleave.
Above, the multiple devices of the ODU that the embodiment of the present invention is provided is illustrated, and more detailed description please refer to the description in embodiment mono-.The present embodiment technical scheme is applicable to the scene that the wide data streaming service of multichannel small band is multiplexed into 1 road or the large band data stream of multichannel business.
The embodiment of the present invention adopts technique scheme, has obtained following technique effect:
Support bandwidth chahnel dynamically changeable, can be by bandwidth sharing, dynamic lossless distributes buffer memory;
In the situation that not improving clock frequency, fully share, maximize cache resources and logical resource that multiplex channel is processed;
In the situation that clock frequency is constant, make logical resource demand according to business total bandwidth linear growth;
Do not exist sequential nervous, the congested physics realization risk that waits.
One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks of above-described embodiment can complete by hardware, also can complete by the relevant hardware of program command, this program can be stored in a computer-readable recording medium, and storage medium can comprise: read-only memory, random-access memory, disk or CD etc.
Multiple connection method and the device of the Optical Channel Data Unit-k above embodiment of the present invention being provided are described in detail, but the explanation of above embodiment is just understood method of the present invention and core concept thereof for helping, and should not be construed as limitation of the present invention.In the technical scope that those skilled in the art disclose in the present invention, the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.
Claims (8)
1. a multiple connection method of Optical Channel Data Unit-k ODU, is characterized in that, comprising:
Adopt and share data buffer storage preservation low order ODU data flow, described shared data buffer storage is the spatial cache that each low order ODU dynamic assignment is mated with the amount of bandwidth of described low order ODU;
The multichannel low order ODU data that described ODU data flow is comprised are mapped as respectively multi-path light channel data tributary unit ODTU data by time division way;
The high-order ODU data that described multichannel ODTU data multiplexing is interleave for empty minute byte.
2. method according to claim 1, is characterized in that, described is that the high-order ODU data that empty minute byte interleaves comprise by described multichannel ODTU data multiplexing:
Each byte of multichannel ODTU data is write in cache module;
The ODTU data that write in cache module are carried out to transposition;
ODTU data after transposition are carried out to a sky minute byte and interleave, obtain high-order ODU data.
3. method according to claim 2, is characterized in that:
Described cache module comprises the first cache module and the second cache module;
Described each byte by multichannel ODTU data writes cache module and comprises:
According to control signal ab_sel, determine each byte of ODTU data is write to the first or second cache module;
According to control signal addr, determine that each byte writes determined first or the particular location of the second cache module.
4. method according to claim 2, is characterized in that:
Bit wide of each line display of ODTU data after transposition, a time slot is shown in each list;
Describedly ODTU data after transposition are carried out to a sky minute byte interleave and comprise:
Described the first cache module is divided into n the first buffer unit, described the second cache module is divided into n the second buffer unit, n is natural number;
Described n the first buffer unit and n the second buffer unit are divided into n group according to demand, and each group comprises first buffer unit and second buffer unit;
Each row ODTU data of the first buffer unit of each group and the second buffer unit are carried out to a sky minute byte to be interleave.
5. a multiple devices of Optical Channel Data Unit-k ODU, is characterized in that, comprising:
Share data buffer storage, for preserving low order ODU data flow, the spatial cache mating with the amount of bandwidth of described low order ODU for each low order ODU dynamic assignment;
Data-mapping module, is mapped as respectively multi-path light channel data tributary unit ODTU data for the multichannel low order ODU data that described ODU data flow is comprised by time division way;
Space-time divides modular converter, for the high-order ODU data that described multichannel ODTU data multiplexing is interleave for empty minute byte.
6. device according to claim 5, is characterized in that, described space-time divides modular converter to comprise:
Writing unit, for writing cache module by each byte of multichannel ODTU data;
Transposition unit, for carrying out transposition to writing the ODTU data of cache module;
An empty minute byte interleaves unit, carries out a sky minute byte interleave for the ODTU data to after transposition, obtains high-order ODU data.
7. device according to claim 6, is characterized in that:
Described cache module comprises the first cache module and the second cache module;
Said write unit, specifically for determining each byte of ODTU data write to the first or second cache module according to control signal ab_sel; According to control signal addr, determine that each byte writes determined first or the particular location of the second cache module.
8. device according to claim 6, is characterized in that:
Bit wide of each line display of ODTU data after transposition, a time slot is shown in each list;
A described sky minute byte interleaves unit, specifically for described the first buffer unit being divided into n the first buffer unit, described the second cache module is divided into n the second buffer unit, and n is natural number; Described n the first buffer unit and n the second buffer unit are divided into n group according to demand, and each group comprises first buffer unit and second buffer unit; Each row ODTU data of the first buffer unit of each group and the second buffer unit are carried out to a sky minute byte to be interleave.
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