CN1770673A - Spending processing method for service integration in OTN network - Google Patents
Spending processing method for service integration in OTN network Download PDFInfo
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- CN1770673A CN1770673A CN 200410092077 CN200410092077A CN1770673A CN 1770673 A CN1770673 A CN 1770673A CN 200410092077 CN200410092077 CN 200410092077 CN 200410092077 A CN200410092077 A CN 200410092077A CN 1770673 A CN1770673 A CN 1770673A
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Abstract
This invention relates to digital information transmission OTN network business compound expenditure process method, which comprises the following steps: a, dividing the OTN frame OPU net load area in low speed business signal mapping and compound OTN; b, indicating OPU net load area division, dispatching and relative customer business type and the OPU net load area is divided into several same time gaps and adopting alliance sequence MFAS relative net load structure to indicate FSI each time gap to relative customer terminal and relative customer business type information; dividing the OPU customer terminal and relative customer business type and using the OPU expenditure to express relative customer business sub-block position information.
Description
Technical field
The present invention relates to the transmission of digital information, relate in particular to the consumption processing method of service integration in a kind of OTN network.
Background technology
Along with the continuous growth of voice service and data service, to the capacity that transmits network constantly increase, transmission bandwidth also improving constantly.Transmission technology has mainly experienced several developing stage such as PDH, SDH, WDM, the PDH technology mainly adopts the mode of asynchronous multiplexing to improve transmission rate, the SDH technology mainly improves transmission rate by the mode of synchronous multiplexing, and WDM technology mainly improves line transmission bandwidth by the wavelength multiplexing mode.
The main at present data that adopt are handled the network configuration that is mapped to WDM afterwards again by SDH, for data service, need to give wdm system afterwards again and handle through mapping, the multiplexing process of SDH earlier, producing the long signal of a standing wave transmits in the optical fiber medium, for speech business, mode by the SDH synchronous multiplexing forms the high-speed SDH signal, is mapped to carry out the wavelength multiplexing processing in the wdm system again.The network layer complexity that this network configuration relates to, and introduced a large amount of overheads, the operation cost height.
OTN (Optical Transport Network, optical transfer network) technology has overcome the defective of SDH and WDM technology, can transparent carrying data, voice and other service signals.The OTN standard code three speed grade: other OTU1/ODU1/OPU1 of 2.5G level, other OTU2/ODU2/OPU2 of 10G level, other OTU3/ODU3/OPU3 of 40G level, ITU-T G.709 standard code the CBR signal of 2.5Gbps, 10Gbps, 40Gbps to the mapping processing mode of OTU1, OTU2 and OTU3, also stipulated the multiplexing process mode of low speed OTN (comprising ODU1, ODU2) signal to high speed OTN (comprising OTU2, OTU3) frame structure.
How not shine upon be multiplexed in OTN frame structure as yet by SONET/SDH signal such as the CBR signal of regulation low speed such as OC-3/STM-1, OC-12/STM-16 and data service for the OTN standard.
U.S. Pat 20030048813A1 (Optix Networks Inc.) has stipulated a kind of method with CBR (constant rate of speed bit stream) signal map and the multiplexing OTN of advancing frame, this patent has been used for reference the multiplexing process mode of low speed OTN signal to high speed OTN frame structure, the payload part of high speed OTN frame is divided into a plurality of time slot groups, give different clients with each time slot set of dispense, wherein each CBR client Overhead of being correlated with is mapped in the OPU overhead area.
In sum, prior art has following deficiency:
1, above-mentioned patent has just been described simply with OPU (the OpticalChannel Payload Unit in the OTN frame structure, the optical channel Payload Unit) the overhead area carrying is shone upon with the client and is handled relevant expense, how regulation is not handled expense, for how processing expenditure does not provide effectively means of reality.
2, how above-mentioned patent is not described low speed CBR signal, low speed ODU (Optical ChannelData Unit, Optical Channel Data Unit-k) is professional and the mixed service low speed data signal is mapped among the OTN and transmits.
3, for OTN standard and above-mentioned patent, all be confined to have low speed CBR signal and the low speed ODU signal map and the multiplexing overhead processing of fixed relationship, lack mapping of low speed service signal and multiplexing overhead processing at any bandwidth with OPU payload area bandwidth.
Summary of the invention
The object of the present invention is to provide the consumption processing method of service integration in a kind of OTN network, the service signal of multiple low speed service signal or its mixing is provided, and the consumption processing method when comprising the low speed service signal mapping of any bandwidth and being multiplexed into the OTN frame structure, with easy and realize the mapping of low speed service signal and the multiplexing overhead processing of any bandwidth effectively.
The consumption processing method of service integration adopts following steps in the OTN network of the present invention:
The OPU payload area of OTN frame is divided in A, low speed service signal mapping and when being multiplexed into OTN;
B, in the OPU overhead area division, distribution and relevant client's traffic type information of indication OPU payload area.
In the described steps A, when dividing the OPU payload area of OTN frame, the OPU payload area is divided into the identical time slot of some sizes; Among the described step B, in the OPU overhead area, adopt the pairing PSI of multi-frame alignment sequence MFAS (MultiFrame Alignment Sequence) (Payload Structure Identifier, the indication of payload structure) expression each time slot allocation to be given the information of corresponding client port and respective client type of service;
In the described steps A, described each time slot in the OPU payload area by the sequence number sequence arrangement, be fixed in the OPU payload area;
In the described steps A, described each time slot adopts the time-multiplexed mode of TDM in the OPU payload area, be fixed in the OPU payload area by sequence number;
Among the described step B, described payload structure indication PSI byte is divided into two sections, represents pairing client's type of service of related time-slot and the client port that is distributed respectively;
Adopt the value of multi-frame alignment sequence MFAS to specify time slot corresponding, carry out the speed adjustment for the pairing client's business of this time slot with indication;
Employing is to the mode of payload structure indication PSI circulation assignment, and indication is carried out the speed adjustment to the pairing client's business of certain specific time slot.
In the described steps A, when dividing the OPU payload area of OTN frame, the OPU payload area is divided into the plurality of sub piece; Among the described step B, in the OPU overhead area, adopt the pairing payload structure indication of multi-frame alignment sequence MFAS PSI to represent the corresponding informance of client port and respective client type of service, and utilize the overhead byte of OPU overhead area to represent the sub-piece positional information of respective client business at the OPU payload area;
Described client's business is indicated by three reserved words of OPU overhead area in the sub-piece positional information of OPU payload area;
Employing is represented the sub-piece position of certain specific client's business in the OPU payload area to the mode of payload structure indication PSI circulation assignment;
Employing is to the mode of described payload structure indication PSI circulation assignment, and expression is carried out the speed adjustment to certain specific client's business;
Adopt the value of multi-frame alignment sequence MFAS to specify the corresponding client business, expression is carried out the speed adjustment to this client's business;
Described low speed service signal is low speed CBR signal, low speed ODU signal, low speed data signal, or the mixing of multiple signal wherein;
For described low speed CBR signal or low speed ODU signal, need judge whether to adopt asynchronous mapping, adjust control accordingly by adjustment control byte JC (Justification Control), negative justification opportunity byte N JO (Negative Justification Opportunity) in the OPU overhead area, positive justification opportunity byte PJO (Positive Justification Opportunity).
Beneficial effect of the present invention is: in the present invention, low speed service signal mapping and when being multiplexed into OTN, the OPU payload area of dividing the OTN frame is time slot or sub-piece, division, distribution and relevant client's traffic type information of indication OPU payload area in the OPU overhead area.
For having the low speed service signal mapping of fixed relationship with OPU payload area bandwidth and being multiplexed into the overhead processing of OTN frame, adopt payload structure indication PSI to represent the information of each time slot allocation to corresponding client port and respective client type of service, by payload structure indication PSI byte is divided into two sections, represent pairing client's type of service of related time-slot and the client port that is distributed respectively, provide easy, effective means for processing expenditure.
Shine upon and be multiplexed into the overhead processing of OTN frame for the low speed service signal of any bandwidth, adopt payload structure indication PSI to represent the corresponding informance of client port and respective client type of service, and utilize three reserved words of OPU overhead area, expression respective client business is in the sub-piece positional information of OPU payload area, processing method is simple, and is workable, like this, with regard to the payload area dividing mode that does not need to fix, the corresponding relation of OPU payload area and client port is carried by the OPU expense.
In the present invention, can (this division can be divided at the fixing time slot of fixed-bandwidth with the dividing condition of OPU payload area; Also can be according to client's service port, the bandwidth different to client's traffic assignments of different bandwidth, beginning with the OPU payload area, end position is represented), different area dividing is to the distribution condition of client's service port, and different client's traffic type information are with indicating in the OPU overhead area, indicate according to the OPU expense, can obtain the number of time slots that the OPU payload area comprises, the client's service port number that inserts, client's traffic type information of different port, the positional information of client's business in the OPU payload area, extract client's service signal according to these information, for low speed CBR or low speed ODU business, can also adjust operation accordingly to client's business according to adjusting the indication of control expense, receiving terminal can utilize the corresponding Overhead of OPU overhead area, directly from payload area, extract the signal that belongs to each client port, be convenient to signal and recover, need not be configured at receiving terminal.
In a word, the invention provides the service signal of multiple low speed service signal or its mixing, and the consumption processing method when comprising the low speed service signal mapping of any bandwidth and being multiplexed into the OTN frame structure, its implementation is easy, effective, strong operability.
Description of drawings
Fig. 1 is an OTN frame structure schematic diagram;
Fig. 2 is an OPU expense structural representation;
Fig. 3 is for adjusting the overhead byte correspondence table;
Fig. 4 divides schematic diagram for payload structure indication PSI byte;
Fig. 5 is the distribution condition schematic diagram of division of OPU1 time slot and respective client port;
Fig. 6 is the distribution condition schematic diagram of division of OPU1 time slot and respective client port;
Fig. 7 for time slot to the distribution of client port and the assignment schematic diagram of corresponding OPU expense;
Fig. 8 indicates the initial row of client's business and finishes schematic diagram for three reserved words that adopt the OPU overhead area;
Fig. 9 is payload structure indication PSI byte and reserved word distribution schematic diagram;
Figure 10 is that 2 STM-4 add that 1 GbE mapping is multiplexed into payload and the expense distribution schematic diagram among the OPU1.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
The frame structure of three kinds of different rates has been stipulated in the OTN suggestion, is respectively other OTU1/ODU1/OPU1 of 2.5G speed level, other OTU2/ODU2/OPU2 of 10G speed level, other OTU3/ODU3/OPU3 of 40G speed level.For the OTN frame of every kind of speed, its frame structure size is identical, and transmission rate there are differences, for example for the OTU1/ODU1/OPU1 frame, frame period is about 48us, and the frame period of OTU2/ODU2/OPU2 is about 12us, and the frame period of OTU3/ODU3/OPU3 is about 3us.
As shown in Figure 1, G.709 the suggestion structure of having stipulated the OTN frame is the block byte structures of 4 row, 4080 row, and wherein front 16 is classified as between the overhead area, 17～3824 row of OTN to being forward error correction FEC (Forward Error Correction) overhead area between payload area, 3825～4080 row.
The OPU overhead area as shown in Figure 2, the 16th of the 1st～3 row is classified as and is adjusted control byte JC, the 4th row the 16th is classified negative justification opportunity byte N JO as, the 4th row the 17th is classified positive justification opportunity byte PJO as, JC and NJO, PJO form adjustment control expense, are used for the frequency departure between adaptive client signal and the OTN frame signal.The 4th row the 15th is classified OPU payload structure indication PSI byte as, is the relevant expense of customer information of shining upon in the OPU frame structure.
As shown in Figure 2, the OPU overhead area comprises the relevant expense of client signal mapping: payload structure indication PSI, PSI is the multi-frame structure of 256 bytes, wherein the implication of each byte is defined by the value of multi-frame alignment sequence MFAS correspondence, multi-frame alignment sequence MFAS is that 0 (decimal system) is corresponding to PT (payload type), G.709 standard is stipulated respectively the situation that different client signals are mapped to the OPU payload area, shown in the payload type code table of table 1.For example, for the asynchronous mapping situation (being Asynchronous CBR) of CBR signal, this zone is set to 0x02; PSI[1]～PSI[255] for shining upon and the specific expense of cascade.For the low speed ODUj of regulation G.709 to high speed ODUk (situation that j＜k) is multiplexing, multi-frame alignment sequence MFAS is that the zone of 1 correspondence is a reserve bytes; Multi-frame alignment sequence MFAS is that the zone of 2～17 correspondences is multiplexing structure instruct MS I, the MSI zone comprises the multiplexing structure information of low speed ODUj tributary signal in high speed OPUk signal, according to the MSI indication, can determine the position of low speed tributary signal in the OPU payload area.As shown in Figure 3, the OPU overhead area also comprises adjustment expense JC, NJO, the PJO that is used for asynchronous mapping, wherein JC is for adjusting control byte, what work is the bit 7,8 of JC byte, and NJO is the negative justification opportunity byte, if client signal speed is greater than the OPU frame rate, then in this byte area padding data byte, PJO is the positive justification opportunity byte, when client signal speed less than the OPU frame rate, just fill and adjust byte in this zone; When client signal speed equals the OPU frame rate, will not adjust operation, promptly the NJO byte is a byte of padding, the PJO byte is a data byte.In the mapping direction of client signal to the OPU frame, produce JC, NJO, PJO information according to this rule, and separate the mapping direction, just according to the information of the bit 7,8 of the JC byte that receives from the OPU frame to client signal, adopt 3: 2 majority vote rules, from NJO and PJO, extract corresponding information.
| MSB 1 2 3 4 | | 16 carry | Type | |
| 0 0 0 0 | 0 0 0 1 | 01 | | |
| 0 0 0 0 | 0 0 1 0 | 02 | | |
| 0 0 0 0 | 0 0 1 1 | 03 | Bit | |
| 0 0 0 0 | 0 1 0 0 | 04 | | |
| 0 0 0 0 | 0 1 0 1 | 05 | | |
| 0 0 0 0 | 0 1 1 0 | 06 | Virtual Concatenated | |
| 0 0 0 1 | 0 0 0 0 | 10 | Bit stream with | |
| 0 0 0 1 | 0 0 0 1 | 11 | Bit stream without | |
| 0 0 1 0 | 0 1 1 0 | 20 | | |
| 0 1 0 1 | 0 1 0 1 | 55 | Not avai | |
| 0 1 1 0 | 0 1 1 0 | 66 | Not avai | |
| 1 0 0 0 | x x x x | 80-8F | Reserved codes for |
| 1 1 1 1 | 1 1 0 1 | FD | NULL |
| 1 1 1 1 | 1 1 1 0 | FE | PRBS |
| 1 1 1 1 | 1 1 1 1 | FF | Not avai lable |
Table 1
The present invention uses the PSI information of OPU overhead area, division, distribution and relevant client's traffic type information of indication OPU payload area.The present invention adopts the principle of existing PSI byte allocation G.709, utilize PT (be PSI[0] position) for binary one 000 xxxx, be the value of hexadecimal value 0x80～0x8F section, indication OPUk payload area carries a plurality of any low speed service signals.PT can be defined as any the fixing value (being assumed to 0x80) between 0x80～0x8F, expression OPU payload area has carried a plurality of low speed service signals.
According to multiplexing low speed Business Conditions of Customers, at specific low speed client business, has fixed relationship between the bandwidth between client's business, and have certain related with OPU payload area bandwidth, as multiple relation in some sense, adopt fixing time slot dividing mode, realize that low speed client business arrives the multiplexing of OPU payload area.G.709, the method for salary distribution that ITU-T also adopts this fixedly time slot to divide, realization low speed ODU1/ODU2 is multiplexing to OPU2/OPU3's, although the speed of ODU1/ODU2 is not strict multiple relation, and the payload area bandwidth of their speed and OPU2/OPU3 neither concern by strict multiple, but this processing allows single low speed business to stride a plurality of high speed OPU signals.This bandwidth allocation scheme is suitable for the situation of low speed CBR business/low speed ODU service integration to high speed OPU payload area.For example one or more mixed services with CBR155/CBR622/CBR2.5G/CBR10G/ODU1/ODU2 are multiplexed into high-order OPU payload area.At this moment, be divided into the identical time slot of some sizes during with the OPU payload area of OTN frame, in the OPU overhead area, adopt pairing each time slot allocation of PSI information representation of multi-frame alignment sequence MFAS to give the information of corresponding client port and respective client type of service.
As shown in Figure 4, represent maximum number of time slots in the OPU payload area with N, i represents some time slots, 1≤i≤N; K represents the client port number, 0≤k≤N.
PSI[0] value representation OPU payload area carried a plurality of low speed business, be set to a value between 0x80～0x8F.PSI[1] number of time slots of expression OPU payload area, value is N.PSI[i+1] (1≤i≤N) i time slot allocation of expression given which client port and this client's type of service.PSI[i+1] gap information of the OPU payload area that takies of expression client type of service and this client's business.Can distribute like this, low 4-bit represents which client port is i time slot allocation given, the value representation client port sequence number that this is regional, PSI[i+1] high 4-bit be client's type of service zone, the professional corresponding different value of different clients.As shown in Figure 4, PSI[i+1] the client's type of service zone of high 4-bit is with to hang down the 4-bit client port accordingly corresponding as follows:
0000:ODU1 0000: client port 1
0001:ODU2 0001: client port 2
0010:OC-3/STM-1 0010: client port 3
0011:OC-12/STM-4 0011: client port 4
0100：OC-48/STM-16
0101：OC-192/STM-64 …
1111: client port 16
Other：reserved
This two parts information has been arranged, just can judge which client port this time slot is assigned to, to give different client's service port processing modules at receiving terminal from the information that the OPU payload area extracts according to this information, and just can guarantee correct recovery client service signal.Simultaneously, can also get access to client's type of service that this client port inserts.
Also can use PSI[N*j+i+1] with PSI[i+1] mode of the identical circulation assignment of definition, i.e. PSI[N*j+i+1] and with PSI[i+1] get identical value.Wherein, 1≤i≤N, 0≤j≤[254/N]-1 ([254/N] is that N removes 254 integer part), j represents the maximum cycle of time slot allocation.For example, if N=16, then i=1～16, j=0～14.Then with the 2nd OTN frame in the multi-frame, the 18th OTN frame, the 32nd OTN frame ..., the 226th OTN frame the PSI byte location all distribute to the 1st time slot corresponding client port and respective client type of service; With the 17th OTN frame in the multi-frame, the 33rd OTN frame ..., the 241st OTN frame the PSI byte location all distribute to the 16th time slot corresponding client port and respective client type of service.If PSI[i+1] low 4-bit value be k, expression with i time slot allocation to (k+1) individual client port, and PSI[i+1] high 4-bit value represent the type of service of k client port; PSI[N*j+i+1] value comprise identical time slot equally to the distribution condition of client port and corresponding client's traffic type information.
Now lift a practical application for example down: add that for 3 STM-4 the situation that client's service signal of 4 STM-1 is multiplexed in the OPU1 frame structure is as follows:
The client port ordering is:
Client port #1:STM-4#1; Client port #2:STM-1#1;
Client port #3:STM-1#2; Client port #4:STM-4#2;
Client port #5:STM-1#3; Client port #6:STM-4#3;
Client port #7:STM-1#4.
In this case, because the bandwidth of client's service signal has the multiple relation, be that STM-4 client's service bandwidth is 4 times of STM-1 client's service bandwidth, therefore the OPU1 payload part can be divided into 16 time slots (corresponding to time slot # 1～time slot #16), each time slot has the bandwidth of STM-1.
As shown in Figure 5, each time slot in the OPU payload area by the sequence number sequence arrangement, be fixed in the OPU payload area.
As shown in Figure 6, each time slot adopts the time-multiplexed mode of TDM in the OPU payload area, be fixed in the OPU payload area by sequence number.
As shown in Figure 5 and Figure 6, the time slot that provides to the relations of distribution of client port is:
Like this, as shown in Figure 7:
PSI[2]～PSI[5] time slot corresponding all distributed to the STM-4 business of client port # 1,
PSI[2 then]～PSI[5] value is 0,011 0000;
PSI[6] time slot corresponding distributed to the STM-1 business of client port # 2,
PSI[6 then] value is 0,010 0001;
PSI[7] time slot corresponding distributed to the STM-1 business of client port # 3,
PSI[7 then] value is 0,010 0010;
PSI[8]～PSI[11] time slot corresponding all distributes to the STM-4 business of client port # 4,
PSI[8 then]～PSI[11] value is 0,011 0011;
PSI[12] time slot corresponding distributed to the STM-1 business of client port # 5,
PSI[12 then] value is 0,010 0100;
PSI[13]～PSI[16] time slot corresponding all distributes to the STM-4 business of client port # 6,
PSI[13 then]～PSI[16] value is 0,011 0101;
PSI[17] time slot corresponding distributed to the STM-1 business of client port # 7,
PSI[17 then] value is 0,010 0110.
If the corresponding client type of service is low speed CBR signal or low speed ODU signal, just need judge whether to adopt asynchronous mapping to carry out the speed adjustment, at this moment, adjust control accordingly by the adjustment control byte JC in the OPU overhead area, negative justification opportunity byte N JO, positive justification opportunity byte PJO.Adjust control and adopt G.709 standard code method, with reference to figure 3.Here only describe how to represent with expense which time slot is adjusted control and treatment.
For carrying out the situation that speed is adjusted to the client's business that inserts, can specify time slot corresponding with the value of multi-frame alignment sequence MFAS, with indication the pairing client's business of this time slot is carried out the speed adjustment.The situation of dividing for 4 time slots for example can be used the bit[78 of MFAS] altogether 2-bit represent one of them time slot corresponding client business of time slot # 1～time slot # 4 is adjusted; For the situation that 16 time slots are divided, just use the bit[5678 of MFAS] altogether 4-bit represent one of them time slot corresponding client business of time slot # 1～time slot # 16 is adjusted, the rest may be inferred.
Also can adopt mode, be used to represent the pairing client's business of certain specific time slot is carried out the speed adjustment payload structure indication PSI circulation assignment.With reference to above-mentioned Fig. 4 and relevant explanation, use PSI[N*j+i+1] mode of circulation assignment, indication is adjusted processing to the corresponding client's business of certain specific time slot, and then (N*j+i+1) individual OTN frame just can be adjusted operation to client's business of i time slot allocation in the multi-frame.For example there are 4 client's business, 16 situations that time slot is divided, N=16, i=1～16, j=0～14, then the 2nd OTN frame in the multi-frame, the 18th OTN frame, the 34th OTN frame ..., the 226th OTN frame can adjust operation to the 1st time slot corresponding client business, adopt adjustment such as JC and NJO, PJO to control expenses and handle; And the 17th OTN frame in the multi-frame, the 33rd OTN frame ..., the 241st OTN frame can adjust operation to the 16th time slot corresponding client business, adopt adjustment such as JC and NJO, PJO to control expenses and handle.
In above-mentioned practical application example, the time slot that is suitable for the OPU payload area is divided fixing situation, promptly the OPU payload area is divided according to certain rule, label is time slot # 1 respectively, time slot # 2, time slot #N, each time slot is in the fixed position in the OPU payload area, at this moment, as long as obtain the sequence number of time slot, just can determine corresponding client's business has occupied which the part payload area in the OTN frame structure, reflected that the present invention is for having fixed relationship between the bandwidth and also having certain related (mixing) low speed service signal with OPU payload area bandwidth, as, low speed CBR signal, low speed ODU signal, the mixing of low speed data signal or multiple signal wherein etc., the division of the OPU payload area that is adopted, distribute and the OPU consumption processing method.
For client's service signal hybrid multiplex of any bandwidth during to the situation of OTN frame structure, the OPU payload area of dividing the OTN frame is the plurality of sub piece, each sub-piece takies the OPU payload row of some, in the OPU overhead area, adopt the pairing payload structure indication of multi-frame alignment sequence MFAS PSI to represent the corresponding informance of client port and respective client type of service, and utilize three reserved word RES1 of OPU overhead area, RES2 and RES3 represent the sub-piece positional information of respective client business at the OPU payload area, first row in the 15th row as shown in Figure 2, three reserved word RES1 of second row and the third line, RES2 and RES3, like this, client's business can be as accurate as row in the position of OPU payload area, OPU payload area one has 3080 row, as shown in Figure 8, just can represent with 12-bit length, therefore, these three bytes can represent that this client's business has taken the begin column and the end column of OPU payload area.
Relevant expense can be distributed in the following way: the MFAS value is 0 PSI[0] be that PT still represents to have comprised in the OPU payload area a plurality of low speed service signals, value is a value among 0x80～0x8F; Being the OPU expense PSI[1 of 1 OTN frame with the MFAS value] client port that comprises of expression OPU payload area counts N (the maximum accesses of supporting 254 client's service signals), as shown in Figure 9, N represents the client port number, with the MFAS value is (i+1) corresponding PSI[i+1] (1≤i≤N) represent i client port corresponding client traffic type information to be set as follows for information about:
PSI[2]0000 0000：ODU1
PSI[3]0000 0001：ODU2
… 0000 0010：OC-3/STM-1
0000 0011：OC-12/STM-4
0000 0100：OC-48/STM-16
0000 0101：OC-192/STM-64
0000 1000：GbE
0000 1001：FC100
…
This moment, three reserved word RES1, RES2 and the RES3 of OPU overhead area indicated this client's business to take the sub-piece position of OPU payload area.
Also can use PSI[N*j+i+1] expense represents i client port corresponding client type of service, 1≤i≤N wherein, 0≤j≤[254/N]-1 ([254/N] is that N removes 254 integer part), the end column of high this client's business of 4bit combination expression of the initial row of this client's business of the expression of the 8bit of the low 4bit of the RES2 of OPU overhead area and RES1 combination at this moment, the 8bit of RES3 and RES2.
For example, if insert 4 client's business, then the value of N is 4, promptly, the OPU payload area is divided into 4 sub-pieces, and the i value is 1～4, and the j value is 0～62, PSI[2 then], PSI[6] ..., PSI[250] the 1st client's type of service of value representation, corresponding RES3～the 1st client's business of RES1 value representation, end position and the starting position of promptly corresponding sub-piece in the OTN frame structure; PSI[5], PSI[9] ..., PSI[253] position represents the 4th client's type of service, it is corresponding that RES3～the 4th end position and the starting position of client's business in the OTN frame structure represented in the RES1 position.
The mode of this circulation assignment, can be used for indicating certain specific client's business is carried out the speed adjustment, if this corresponding client's business is low speed CBR or low speed ODU business, just can determine whether as required need be at PSI[N*j+i+1] corresponding OTN frame adjusts processing to i client's business, adjusts the method that G.709 standard code is adopted in processing.
Use PSI[N*j+i+1] circulate and stipulate that the method for each client's business can guarantee the adjustment cycle of low speed CBR or low speed ODU client business less, just once adjust chance every the N frame, otherwise, may need could once adjust operation to client's business through 256 frames.The method of adjusting according to this circulation assignment can compensate the frequency deviation difference in the standard code scope.
Equally, also can adopt the value of multi-frame alignment sequence MFAS to specify the corresponding client business, can carry out the speed adjustment to this client's business with indication, for example insert the situation of 4 client's business, bit[78 according to MFAS] value determines which client's business is carried out the speed adjustment, when this client's business is low speed CBR signal or low speed ODU signal, need judge whether to adopt asynchronous mapping, adjust control accordingly by the adjustment control byte JC in the OPU overhead area, negative justification opportunity byte N JO, positive justification opportunity byte PJO.
Adopt this overhead processing mode, can realize maximum 254 different clients professional mapping and multiplexing process to the OTN frame, comprise different clients' CBR business, different clients' low speed ODU business, different clients' data service, and the hybrid multiplex and the mapping of different clients' CBR business, low speed ODU business and data service, the restriction of client's service bandwidth that it is not subjected to restriction that the OPU payload area divides, do not inserted.
Now lift another practical application for example down: it is as follows to add that for 2 STM-4 client's service signal mapping of 1 GbE is multiplexed into the situation of OPU1 payload area:
Bandwidth demand according to the different clients mouth, the payload area of OPU is divided into three sub-pieces (sub-piece # 1～sub-piece #3), divide according to client's service port number, the payload area that will belong to each client's service port is defined as sub-piece, the amount of bandwidth of each sub-piece is unrestricted, and for STM-4, corresponding sub-piece accounts for 952 row, for the GbE business, corresponding sub-piece accounts for 1904 row.Then the start-stop position of the sub-piece division of OPU payload area, the shared OPU payload area of each client port and each client's traffic type information are as shown in figure 10.
The original position value of client port # 1 should be 0,000 0,001 0001;
The end position value should be 0,011 1,100 1000;
Therefore RES1, RES2, RES3 are respectively 0x11,0x80,0x3C.
The original position value of client port # 2 should be 0,011 1,100 1001;
The end position value should be 0,111 1,000 0000;
Therefore RES1, RES2, RES3 are respectively 0xC9,0x03,0x78.
The original position value of client port # 3 should be 0,111 1,000 0001;
The end position value should be 1,110 1,111 0000;
Therefore RES1, RES2, RES3 are respectively 0x81,0x07,0xEF.
For the MFAS value is the OTN frame of (3*j+1+1), (3*j+2+1) (0≤j≤83), corresponding RES3～RES1 and PSI[3*j+1+1], PSI[3*j+2+1] overhead area is respectively applied for first STM-4 of carrying and the 2nd STM-4 client's business position and the client's traffic type information at the OPU1 payload area, at this moment just can adjust operation to the 1st STM-4 and the 2nd STM-4 client's business accordingly to the mapping of OPU payload area respectively, with the frequency departure of compensation STM-4 business with the OTN frame; The MFAS value is the RES3～RES1 and the PSI[3*j+3+1 of (3*j+3+1) corresponding OTN frame] overhead area then is used to carry position and the client traffic type information of GbE client's business at the OPU1 payload area.
Claims (14)
1. the consumption processing method of service integration in the OTN network, it is characterized in that: it adopts following steps:
A, with low speed service signal mapping with when being multiplexed into OTN, divide the OPU payload area of OTN frame;
B, in the OPU overhead area division, distribution and relevant client's traffic type information of indication OPU payload area.
2. the consumption processing method of service integration in the OTN network according to claim 1 is characterized in that: in the described steps A, when dividing the OPU payload area of OTN frame, the OPU payload area is divided into the identical time slot of some sizes; Among the described step B, in the OPU overhead area, adopt the pairing payload structure indication of multi-frame alignment sequence MFAS PSI to represent each time slot allocation is given the information of corresponding client port and respective client type of service.
3. the consumption processing method of service integration in the OTN network according to claim 2 is characterized in that: in the described steps A, described each time slot in the OPU payload area by the sequence number sequence arrangement, be fixed in the OPU payload area.
4. the consumption processing method of service integration in the OTN network according to claim 2 is characterized in that: in the described steps A, described each time slot adopts the time-multiplexed mode of TDM in the OPU payload area, be fixed in the OPU payload area by sequence number.
5. the consumption processing method of service integration in the OTN network according to claim 2, it is characterized in that: among the described step B, described payload structure indication PSI byte is divided into two sections, represents pairing client's type of service of related time-slot and the client port that is distributed respectively.
6. according to the consumption processing method of service integration in claim 2 or 3 or the 4 or 5 described OTN networks, it is characterized in that: adopt the value of multi-frame alignment sequence MFAS to specify time slot corresponding, expression is carried out the speed adjustment to the pairing client's business of this time slot.
7. according to the consumption processing method of service integration in claim 2 or 3 or the 4 or 5 described OTN networks, it is characterized in that: adopt the mode to payload structure indication PSI circulation assignment, expression is carried out the speed adjustment to the pairing client's business of certain specific time slot.
8. the consumption processing method of service integration in the OTN network according to claim 1 is characterized in that: in the described steps A, when dividing the OPU payload area of OTN frame, the OPU payload area is divided into the plurality of sub piece; Among the described step B, in the OPU overhead area, adopt the pairing payload structure indication of multi-frame alignment sequence MFAS PSI to represent the corresponding informance of client port and respective client type of service, and utilize the overhead byte of OPU overhead area to represent the sub-piece positional information of respective client business at the OPU payload area.
9. the consumption processing method of service integration in the OTN network according to claim 8 is characterized in that: described client's business is indicated by three reserved words of OPU overhead area in the sub-piece positional information of OPU payload area.
10. the consumption processing method of service integration in the OTN network according to claim 8 is characterized in that: adopt the mode to payload structure indication PSI circulation assignment, represent the sub-piece position of certain specific client's business in the OPU payload area.
11. the consumption processing method of service integration according to Claim 8 or in the 9 or 10 described OTN networks is characterized in that: adopt the mode of described payload structure indication PSI circulation assignment, indication is carried out the speed adjustment to certain specific client's business.
12. the consumption processing method of service integration according to Claim 8 or in the 9 or 10 described OTN networks is characterized in that: adopt the value of multi-frame alignment sequence MFAS to specify the corresponding client business, expression is carried out the speed adjustment to this client's business.
13. the consumption processing method of service integration in the OTN network according to claim 1 is characterized in that: described low speed service signal is low speed CBR signal, low speed ODU signal, low speed data signal, or the mixing of multiple signal wherein.
14. the consumption processing method of service integration in the OTN network according to claim 13, it is characterized in that: for described low speed CBR signal or low speed ODU signal, need judge whether to adopt asynchronous mapping, adjust control accordingly by the adjustment control byte JC in the OPU overhead area, negative justification opportunity byte N JO, positive justification opportunity byte PJO.
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| CN114915375B (en) * | 2022-04-27 | 2023-06-09 | 烽火通信科技股份有限公司 | Service mapping realization method and device |
| WO2023231764A1 (en) * | 2022-05-30 | 2023-12-07 | 华为技术有限公司 | Service data processing method and device |
| WO2024051586A1 (en) * | 2022-09-05 | 2024-03-14 | 华为技术有限公司 | Method for processing data frame in optical transport network, apparatus and system |
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