CN101742364A - Method and system for mapping timeslot signal of optical payload unit to signal frame - Google Patents
Method and system for mapping timeslot signal of optical payload unit to signal frame Download PDFInfo
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Abstract
The invention discloses a method and a system for mapping a timeslot signal of an optical payload unit to a signal frame. The method comprises the following steps of: partitioning a data byte carrying user data, a padding byte carrying padding data and a rate adjusting byte in a virtual container; and when the timeslot signal of the optical payload unit is mapped to the signal frame, mapping the timeslot signal of the optical payload unit carrying the user data to the data byte of the virtual container, padding the padding data in the padding byte of the virtual container, adjusting the rate of the data mapped into the virtual container according to the rate of the timeslot signal of the optical payload unit through the rate adjusting byte, and loading the processed virtual container onto a payload part of the signal frame. A uniform and general technical scheme is provided for a process of mapping the optical payload unit timeslot signal to the signal frame.
Description
Technical field
The present invention relates to the optical-fiber network technology in the communications field, relate in particular to a kind of method and system that optical payload unit time slot signal in the optical transport network are mapped to signal frame.
Background technology
TFI-5 is a kind of signal frame form of optical-fiber network forum (OIF) definition, is mainly used in the interconnection between framer and exchange chip, is the backplane interconnect technology of extensive use in the conventional transmission equipment.The STM-16 frame structure of this signal frame form basic reference light synchronous driving system (SDH), also be divided into parts such as overhead area, payload section, but on the definition of expense and operating rate, carry out new definition, so that be more suitable for transmitting encapsulation, the monitoring of signal in the sub-frame and transmit.Speed also can be STM-16 or STM-20, so that the higher client signal of encapsulation speed.
Optical transport network (OTN, Optical Transport Network) be that a kind of light that ITU-T formulates transmits standard, compare with SDH synchronous transmission system, have advantages such as unified optical interface, packaging efficiency height, transparent transmission client signal, have critical role in jumbo core net field.It is mainly by OPUk (optical channel payload unit, the optical channel Payload Unit), ODUk (optical channel dataunit, optical channel data cell) and OTUk (optical channel transport unit, the optical channel delivery unit) encapsulation of different aspects such as constitutes, k=1,2 or 3 wherein, represent different speed grade, the payload speed of the ODU1 of minimum speed limit grade is the speed of the STM-16 of SDH, i.e. 2.488320Gbit/s.More than can find associated description in G.709 in the standard of ITU-T standard.
Ethernet mainly carries out standard and definition by the international electric electronic engineering IEEE of the committee (Institute of Electrical andEngineers).Ethernet is as a kind of technical system of carrying packet format, obtain widely applying in field of data transmission, the speed grade of its standard is a step-length unit with 10 times, from 10Mbit/s, to 100Mbit/s, arrive 1Gbit/s, 10Gbit/s again, along with the explosive growth of data service, these speed grade spread all over the corner of each communication.Wherein 10M, 100M speed grade more multi-section be deployed in user's desktop and the local area network (LAN), GE (Gigabit Ethernet, gigabit Ethernet), 10GE then carry out the communication of high traffic in metropolitan area and wide area network.Be subject to present technology, these Ethernet services often need to provide the light tranmission techniques of powerful managerial ability, 50ms recovery time to carry, such as OTN and SDH technology, to obtain higher transmission quality.
Also about 2.5Gbit/s, there is the phenomenon of bandwidth waste in the payload bandwidth of the minimum speed limit grade ODU1 of OTN when being used for carrying the GE signal at present, and therefore, OTN proposes the whole bag of tricks in the industry, in the hope of can improve the validity of bandwidth when transmitting the GE signal.Wherein relatively more outstanding way is: ODU1 is proceeded time slot divide, manage, when transmitting, exchangeing subscriber signal, time slot with ODU1 is unit (being the sub-speed of ODU1), then be mapped to the GE signal of Ethernet in these time slots respectively, like this, the ODU1 bandwidth of a standard can be divided into the time slot that 2 bytes interleave, and each time slot can shine upon a GE signal.
But for how the ODU time slot signal is mapped in the concrete signal frame form not unified standard in the prior art, and these time slots are as a passage, can carry GE signal or other signals, the intermediate node that can be directly transmits network at OTN intersects and manages, and, the synchronous chi structure of transmission equipment, often need a kind of general, unified encapsulation format connects ply-yarn drill and exchcange core unit, therefore, press for standard at present the ODU time slot signal is mapped to the specific implementation of signal frame, transmit network to the intersection of signal and the needs of management to satisfy OTN.
Summary of the invention
The embodiment of the invention provides a kind of the optical payload unit time slot signal is mapped to the method and system of signal frame, with standard the optical payload unit time slot signal is mapped to the specific implementation of signal frame, thereby a kind of general, unified implementation method is provided.
The method that the optical payload unit time slot signal is mapped to signal frame that the embodiment of the invention provides comprises:
In virtual container, mark off the data byte of carrying user data, the byte of padding and the rate adjustment bytes of carrying padding data;
When the optical payload unit time slot signal is mapped to signal frame, the optical payload unit time slot signal that carries user data is mapped to the data byte of described virtual container, in the byte of padding of described virtual container, fill in padding data, according to the speed of described optical payload unit time slot signal, by described rate adjustment bytes, the data that are mapped in the described virtual container are carried out the speed adjustment, and the virtual container after will handling is loaded into the payload part of described signal frame.
The system that the optical payload unit time slot signal is mapped to signal frame that the embodiment of the invention provides comprises:
Virtual container is divided module, is used for virtual container is marked off the data byte of carrying user data, the byte of padding and the rate adjustment bytes of carrying padding data;
Mapping block, the optical payload unit time slot signal that is used for carrying user data is mapped to the data byte of described virtual container, in the byte of padding of described virtual container, fill in padding data, according to the speed of described optical payload unit time slot signal, by described rate adjustment bytes, the data that are mapped in the described virtual container are carried out the speed adjustment;
Loading module is used for the virtual container after handling is loaded into the payload part of described signal frame.
The above embodiment of the present invention, by in virtual container, marking off the data byte of carrying user data, the byte of padding and the rate adjustment bytes of carrying padding data, when the optical payload unit time slot signal is mapped to described signal frame, the optical payload unit time slot signal that carries user data is mapped to the data byte of virtual container, in the byte of padding of virtual container, fill in padding data, and according to the speed of optical payload unit time slot signal, through-rate is adjusted byte, the data that are mapped in the virtual container are carried out the speed adjustment, thereby on the one hand, by the structure said structure virtual container and in this virtual container, shine upon user data, fill in padding data and this virtual container is loaded into the payload part of signal frame, thereby provide a kind of unification for the optical payload unit time slot signal is mapped to signal frame, general technical scheme; On the other hand, by rate adjustment bytes is set and in the data map process in virtual container, utilize this rate adjustment bytes carrying user data or padding data, thereby play the data that are mapped in the virtual container are carried out the speed adjustment, make the rate-matched of itself and optical payload unit time slot signal, improved flexibility, availability and the versatility of technical solution of the present invention.
Description of drawings
Fig. 1 is the frame structure schematic diagram of OTU1 in the prior art;
Fig. 2 is that the ODU1 time slot is divided schematic diagram in the prior art;
Fig. 3 is the structural representation of C-4-9c container in the embodiment of the invention;
Fig. 4 is the schematic diagram that the sub-piece of C-4-9c is divided in the embodiment of the invention;
Fig. 5 is the system configuration schematic diagram that the optical payload unit time slot signal is mapped to signal frame in the embodiment of the invention.
Embodiment
In view of the signal frame form that is carried in the concrete time slot of TFI-5 does not have unified standard, for example, than what be easier to expect is the frame format that continues to adopt similar standard ODUk, but also can take other method, it can be a pure passage of no frame format, it also can be the self-defining signal frame that has part monitoring management expense, the embodiment of the invention is not paid close attention to the concrete signal frame form that adopts, but pays close attention to mapping and transparent transmission that the ODU1 time slot is divided all bytes of each time slot of back.
The ODU1 time slot can carry GE signal or other signals as a passage, and the intermediate node that can be directly transmits network at OTN intersects and manages.The synchronous chi structure of transmission equipment often needs a kind of unified encapsulation format to connect ply-yarn drill and exchcange core unit, for example TFI-5 signal frame.
Below in conjunction with accompanying drawing, how the embodiment of the invention is mapped to the TFI-5 signal frame with the ODU1 time slot signal is elaborated.
The G.709 standard that the frame structure of the ODU1 that the embodiment of the invention is quoted is formulated by the ITU-T normal structure defines.As shown in Figure 1, the frame structure of OTU1 is made up of 4 row, 4080 row, has 4 * 4080=16320 byte, wherein the from the 1st to the 16th classifies overhead area as, and the 17th to the 3824th classifies payload section as, and 3825 to 4080 classify FEC (forward error correction) district as.Except that the 1st to the 16th byte and FEC district of first row, rest parts constitutes ODU1.
The payload speed of ODU1 can be 2.488320Gbit/s, just in time transmits the STM-16 signal of a standard.This also is the minimum carrying bandwidth of the OTN system of standard.For the Ethernet GE signal of a large amount of existence, coded speed is 1.25Gbit/s, if map directly to the payload section of ODU1, will cause bandwidth waste, but the such signal of two-way has surpassed the bandwidth that ODU1 can carry again.By code conversion, the 8B/10B code conversion of circuit GE signal is become the 64/66B coding, can with bandwidth reduction in 1.2G, can in an ODU1 payload section, transmit 2 GE signals like this.Equally, the signal of the following speed of other 1G also can transmit with similar method, thereby improve bandwidth utilization.
The division of ODU1 time slot does not have fixing method, can be front and back two parts with whole payload sections directly, can be multiplexed into the method for high speed branch road with reference to SDH low speed branch road yet, interleaves to share payload section by byte.Shown in Figure 2 is that a kind of byte interleaves the example of dividing the ODU1 payload section, and wherein, TS0 represents different time slots with TS1.The division methods of time slot and the concrete structure of time slot be not in protection scope of the present invention.
When ODU1 payload speed was 2.488320Gbit/s, its speed of 1/2 was 1.244160Gbits/s.The embodiment of the invention has been formulated the structure of a kind of C-4-9c, carry the ODU1 time slot signal of 1.244160Gbit/s, and adopt the method for asynchronous mapping that the ODU1 time slot signal is mapped to the TFI-5 signal frame, thereby the transparency that has kept information and clock, and then can in the OTN network, independently intersect and manage.
In the embodiment of the invention, at first need to construct the structure of container of C-4-9c, this structure belongs to the part of payload in the TFI-5 signal frame structure.The structure of container of C-4-9c as shown in Figure 3 in the embodiment of the invention, form by the cascade of 9 virtual container C-4 (hereinafter to be referred as VC-4) structure, the structure of each VC-4 is 260 row * 9 row, each byte-rate is 64kbit/z, so C-4-9c container speed is 260 * 9 * 9 * 64=1.347840Gbit/s.
As previously described, ODU1 is divided into 2 time slots, the speed of one of them time slot signal is half of ODU1 payload speed, be 1.244160Gbit/s, and the speed of C-4-9c is: 260 * 9 * 9 * 64=1.347840Gbit/s, like this, the byte quantity that needs to fill in C-4-9c probably is: (1.347840-1.244160)/64K=1620, the byte of padding quantity of every row is 1620/9=180.
Each C-4-9c is made up of 9 row, 2340 row, as shown in Figure 4, every row is divided into 5 pieces, and each piece comprises 468 bytes, and these pieces further are divided into the sub-piece of 36 13 byte lengths.Aforesaid 180 byte of paddings, the byte number that is assigned to each piece is 180/5=36, just in time is assigned in the sub-piece of 36 13 byte lengths among Fig. 4.The sub-piece of these 13 byte lengths is divided into the control byte of 1 byte length and the data byte of 12 byte lengths, wherein preceding 7 bits of control byte are the fixed stuff R-Bits position, the lowest bit position can be used as the control bit position with bear control information, can have only the control bit position of part control byte to start to control making usefulness.The R that identifies among Fig. 4, J, S, D bit are defined as follows:
D is a data byte, is used to load effective ODU1 gap information, i.e. user data;
R represents fixedly byte of padding, is used to load padding data, and wherein, high 7 is the fixed stuff R-Bits position;
J also is a kind of byte of padding, can be described as to adjust the chance byte, and wherein high 6 be the fixed stuff R-Bits position, and minimum two C and Y bit are to adjust chance judgement bit, and C represents negative justification, and Y represents positive justification.5 such J bytes and C bit and Y bit are arranged respectively in each sub-piece;
N, P are rate adjustment bytes, are used for the indication according to J byte C bit and Y bit, load padding data or user data, and its effect is that the data rate that is mapped among the C-4-9c is adjusted;
The C-4-9c of aforesaid way definition when all N, P byte all are used for carrying user data, can obtain peak transfer rate, for: (432+1) * 5 * 9 * 8 * 8000=1247040kbit/s; As all N, when the P byte all is used for carrying padding data, can obtain minimum transmission rate, for: (432-1) * 5 * 9 * 8 * 8000=1241280kbit/s.Usually, the speed of ODU1 time slot signal is to be respectively 1244160 under the situation of 20 PPM * (1+20 * 10E-6)=1244185kbit/ and 1244160 * (1-20 * 10E-6)=1244135kbit/s at frequency accuracy, greater than the minimum byte number of the per second of above-mentioned C-4-9c, less than the per second maximum number of byte of above-mentioned C-4-9c, therefore can in the C-4-9c container of embodiment of the invention definition, transmit.
When needs are mapped to the TFI-5 signal frame with the ODU1 time slot signal, according to the ODU1 time slot division principle of formulating, the ODU1 time slot signal of carrying subscriber signal is mapped in the above-mentioned C-4-9c container, comprise: the user data in the ODU1 time slot signal (being active data) is mapped to D byte in the C-4-9c container, writes filling bit in the fixed stuff R-Bits position of R byte and J byte, writes control bit in the control bit position of R byte, and the data that are mapped to the C-4-9c container are carried out the speed adjustment according to the speed of ODU1 time slot signal.Then, the C-4-9c container that is mapped with user data is loaded into the payload part of TFI-5 signal frame.
When carrying out the speed adjustment, if the speed of ODU1 time slot signal is 1244160kbit, then with all N bytes carrying padding datas, all P byte carrying user data in the C-4-9c container, vice versa; If the speed of ODU1 time slot signal, is then used all P bytes and part N byte carrying user data in the C-4-9c container greater than 1244160kbit, all the other N byte carrying padding datas; If the speed of ODU1 time slot signal is less than 1244160kbit, then with all N bytes in the C-4-9c container and part P joint carrying padding data, all the other P joint carrying user data.For example:
As previously mentioned, if the speed of ODU1 time slot signal is 1244160kbit, then need in the C-4-9c container, to fill 1620 byte of paddings, at this moment, can be at all N byte carrying padding datas, in all P byte carrying user data, and the C bit by the J byte in the C-4-9c container is set and the value of Y bit, indicating N byte and P byte data carried by data type, the speed of C-4-9c container just is 1244160kbit like this.The method to set up of the C bit of J byte and the value of Y bit can be: in the data block of each 468 byte length, the value of the C bit in the J byte is changed to 1, expression N byte is used for carrying user data, the value of the Y bit of J byte is changed to 1, and expression P byte is used to carry padding data.Receiving terminal can be by the C bit in the J byte and the majority vote of Y bit, confirm N byte and P byte institute data carried by data type, for example, the value of all 5 C bits is that 1 number is above 3, think then negative justification taken place that i.e. N byte carrying user data is if be that 0 number is above 3, then thinking does not have negative justification to take place, and what the N byte was carried is padding data.
If the speed of ODU1 time slot signal is less than 1244160kbit, then need be in the C-4-9c container packing ratio 1620 more byte of paddings, the number of byte of padding can be by calculating with aforementioned similar method.At this moment, need the P byte of all N bytes and respective numbers to carry padding data, and the C bit by the J byte in the C-4-9c container is set and the value of Y bit, indicate N byte and P byte data carried by data type, so that the rate-matched of the speed of C-4-9c container and ODU1 time slot signal.As the byte of padding number that calculates is 1630 o'clock, the method to set up of the C bit of J byte and the value of Y bit can be: in the data block of 10 468 byte lengths, C bit in the J byte is put 0, and the value of Y bit is changed to 1, expression N byte and P byte carrying padding data; In the data block of all the other 35 468 byte lengths, with the value of the C bit of J byte be changed to 0, the value of the Y bit of J byte is changed to 0, expression N byte carrying padding data, P byte carrying user data;
If the speed of ODU1 time slot signal is greater than 1244160kbit, then need be in the C-4-9c container the few byte of padding of packing ratio 1620, the number of byte of padding can be by calculating with aforementioned similar method.At this moment, need the N byte of all P bytes and respective numbers to come carrying user data, and the C bit by the J byte in the C-4-9c container is set and the value of Y bit, indicate N byte and P byte data carried by data type, so that the rate-matched of the speed of C-4-9c container and ODU1 time slot signal.As the byte of padding number that calculates is 1600 o'clock, the method to set up of the C bit of J byte and the value of Y bit can be: in the data block of 20 468 byte lengths, with the C bit position of the J byte in every is 1, the value of Y bit is changed to 0, expression N byte and Y byte carrying user data; In the data block of all the other 25 468 byte lengths, the C bit of the J byte in every and the value of Y bit are changed to 0, expression N byte carrying padding data, P byte carrying user data.
Judge the setting of bit by above-mentioned adjustment chance to the J byte, receiving terminal can be confirmed N byte and P byte institute data carried by data type by the majority vote to C bit in the J byte and Y bit.If the C bit be 1 number more than or equal to 3, then negative justification has taken place in expression, the content of N byte is a padding data, otherwise the content of N byte is a user data; If same Y bit be 1 number more than or equal to 3, then positive justification has taken place in expression, the content of P byte is a padding data, otherwise the content of P byte is a user data.
The TFI-5 signal frame can have STM-16 (being 2.488320Gbit/s) and two kinds of rate format of STM-20 (being 3.1104Gbit/s), and the overhead area form of these two kinds of rate format is identical, and just payload section is had any different.When speed was 3.1104Gbit/s, payload section expanded to 5400 row, and other are constant.Two kinds of rate format respectively corresponding 16 and 20 VC-4 can load the C-4-9c container, and speed is that the TFI-5 signal frame of 3.1104Gbit/s can load 2 C-4-9c containers.Need carrying as a plurality of C-4-9c, can use the method for a plurality of TFI-5 parallel connections, load these containers jointly.
Need to prove that only provided a kind of preferable C-4-9c structure among Fig. 4, the C-4-9c of the embodiment of the invention is not limited to said structure.Such as, the fixed stuff R-Bits position of R byte can be 7 bits of any appointment among the above-mentioned C-4-9c, C bit in the J byte and Y bit be also not necessarily at minimum 2, and R byte, D byte etc. put in order also R byte not necessarily preceding, D byte after interleaving mode.In addition, the division of the sub-piece of C-4-9c container data and the distribution of byte of padding also can have other modes, such as:
9 row, 2340 row of C-4-9c container are divided into 10 * 9 data blocks, it is the piece that every row is divided into 10 234 byte lengths, the piece of each 234 byte length is divided into 18 sub-pieces, like this, every row comprises 180 sub-pieces, each sub-piece comprises 13 bytes, and the method for salary distribution of the define method of all types of bytes and byte of padding can be similar with aforementioned corresponding description in the piece of each 234 byte length;
For another example, 9 row, 2340 row of C-4-9c container are divided into 20 * 9 data blocks, it is the piece that every row is divided into 20 117 byte lengths, the piece of each 117 byte length is divided into 9 sub-pieces, like this, every row comprises 180 sub-pieces, and each sub-piece comprises 13 bytes, and the method for salary distribution of the define method of all types of bytes and byte of padding can be similar with aforementioned corresponding description in the piece of each 117 byte length.That is, as long as every row is divided into 180 sub-pieces, just can define with reference to the aforesaid way of the embodiment of the invention structure to the C-4-9c container.
Based on identical technical conceive, it is a kind of with the system of optical payload unit time slot mapping to signal frame that the embodiment of the invention also provides.
Referring to Fig. 5, be the system 5 that the optical payload unit time slot mapping is arrived signal frame that the embodiment of the invention provides, this system 5 comprises virtual container division module 51, mapping block 52 and loading module 53, wherein:
Virtual container is divided module 51, is used for virtual container 50 is marked off the data byte of carrying user data, the byte of padding and the rate adjustment bytes of carrying padding data;
Said system can be used for utilizing the C-4-9c container ODU1 time slot signal to be mapped to the process of TFI-5.
Above-mentioned virtual container is divided module 51, C-4-9c can be divided into 180 sub-pieces, wherein:
Have and comprise 11 data bytes and 2 rate adjustment bytes in the sub-piece;
Have and comprise 12 data bytes and 1 first byte of padding in the odd number height piece, there are 6 fixed stuff R-Bits positions and 2 adjustment chances to judge bit in first byte of padding, adjust chances for these 2 and judge that bits are used for indicating respectively 2 to adjust byte data carried by data types;
Comprise 12 data bytes and 1 second byte of padding in all the other sub-pieces, 7 fixed stuff R-Bits positions are arranged in second byte of padding.
Preferable, virtual container is divided module 51 can be divided into 5 with the every row in 9 row of C-4-9c, and every is divided into 36 sub-pieces that comprise 13 bytes.
Above-mentioned mapping block 52 can be according to the speed of optical payload unit time slot signal in the adjustment process of carrying out data rate, and the quantity M and being used to that is identified for the rate adjustment bytes of carrying user data carries the quantity N of the rate adjustment bytes of padding data; In the individual sub-piece of M, first in the byte of padding adjusted chance judge that the value of bit is changed to 1, and in the first rate adjustment byte corresponding, shine upon user data with the first adjustment chance judgement bit; In N sub-piece, second in first byte of padding adjusted chance judge that the value of bit is changed to 1, and in second rate adjustment bytes corresponding, write padding data with the second adjustment chance judgement bit.
Above-mentioned loading module 53 is in carrying out the virtual container loading process, can load the C-4-9c container of respective numbers according to the rate format of TFI-5, as being that the TFI-5 signal frame of 3.1104Gbit/s can load 2 C-4-9c containers for speed, perhaps adopt the TFI-5 of two 2.488320Gbit/s to load.Need carrying as a plurality of C-4-9c, can use the method for a plurality of TFI-5 parallel connections, load these containers jointly.
The above embodiment of the present invention by defining the virtual container C-4-9c of 9 C-4 cascades, and encapsulates the ODU1 time slot signal of standard, the following advantage of tool with this C-4-9c:
(1) can adaptive flexibly multiple different rate frame structure, so long as the 1/2 sub-speed of the ODU1 of standard just can be mapped in the C-4-9c container by byte, with the structure-irrelevant of self;
(2) because these structure of time slot are asynchronous fully with the container that loads them, guaranteed the integrality of self information, clock is transparent fully, and can realize intersecting and management;
(3) Cascading Methods of C-4 have favorable compatibility, can intersect in the equipment that traditional support SDH intersects and manage.
In sum, the structure of the C-4-9c of embodiment of the invention definition, the speed that can have 260 * 9 * 9 * 64=1.347840Gbit/s, can load speed is the ODU1 time slot signal of 1.244160Gbit/s, mode with asynchronous mapping, 1/2 sub-speed (the being the ODU1 time slot) structure of transparent transmission ODU1 is intersected and management maintenance thereby the subscriber signal that is mapped to this sub-speed can be finished at OTN equipment, guarantees the integrality of client signal; And pass through the C-4-9c structure of being constructed, be fitted in the TFI-5 frame structure of standard, thereby realize and the hybrid cross of other VC-4 structures, realize the fusion of OTN equipment and SDH.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. one kind is mapped to the method for signal frame with the optical payload unit time slot signal, it is characterized in that, comprising:
In virtual container, mark off the data byte of carrying user data, the byte of padding and the rate adjustment bytes of carrying padding data;
When the optical payload unit time slot signal is mapped to signal frame, the optical payload unit time slot signal that carries user data is mapped to the data byte of described virtual container, in the byte of padding of described virtual container, fill in padding data, according to the speed of described optical payload unit time slot signal, by described rate adjustment bytes, the data that are mapped in the described virtual container are carried out the speed adjustment, and the virtual container after will handling is loaded into the payload part of described signal frame.
2. the method for claim 1 is characterized in that, according to the speed of described optical payload unit time slot signal, by described rate adjustment bytes, the data that are mapped in the described virtual container is carried out the speed adjustment, comprising:
Speed according to described optical payload unit time slot signal, the quantity and being used to that is identified for the rate adjustment bytes of carrying user data is carried the quantity of the rate adjustment bytes of padding data, and, the data that are mapped in the described virtual container are carried out the speed adjustment by rate adjustment bytes carrying corresponding data with respective numbers.
3. the method for claim 1 is characterized in that, described optical payload unit is ODU1, and described virtual container is C-4-9c; In virtual container, mark off described data byte, byte of padding and rate adjustment bytes, be specially:
C-4-9c is divided into 180 sub-pieces, wherein:
Have and comprise 11 data bytes and 2 rate adjustment bytes in the sub-piece;
Have and comprise 12 data bytes and 1 first byte of padding in the odd number height piece, have 6 fixed stuff R-Bits positions and 2 adjustment chances to judge bit in described first byte of padding, described 2 adjustment chances judge that bits are used for indicating respectively 2 to adjust byte data carried by data types;
Comprise 12 data bytes and 1 second byte of padding in all the other sub-pieces, 7 fixed stuff R-Bits positions are arranged in described second byte of padding.
4. method as claimed in claim 3 is characterized in that, C-4-9c is divided into 180 sub-pieces, is specially: the every row in 9 row of C-4-9c is divided into 5, and every is divided into 36 sub-pieces that comprise 13 bytes.
5. method as claimed in claim 3 is characterized in that, according to the speed of described optical payload unit time slot signal, by described rate adjustment bytes, the data that are mapped in the described virtual container is carried out the speed adjustment, comprising:
According to the speed of described optical payload unit time slot signal, the quantity M and being used to that is identified for the rate adjustment bytes of carrying user data carries the quantity N of the rate adjustment bytes of padding data;
In the individual sub-piece of M, first in first byte of padding adjusted chance judge that the value of bit is changed to 1, and in the first rate adjustment byte corresponding, shine upon user data with the first adjustment chance judgement bit;
In N sub-piece, second in first byte of padding adjusted chance judge that the value of bit is changed to 1, and in second rate adjustment bytes corresponding, write padding data with the second adjustment chance judgement bit.
6. one kind is mapped to the system of signal frame with the optical payload unit time slot signal, it is characterized in that, comprising:
Virtual container is divided module, is used for virtual container is marked off the data byte of carrying user data, the byte of padding and the rate adjustment bytes of carrying padding data;
Mapping block, the optical payload unit time slot signal that is used for carrying user data is mapped to the data byte of described virtual container, in the byte of padding of described virtual container, fill in padding data, according to the speed of described optical payload unit time slot signal, by described rate adjustment bytes, the data that are mapped in the described virtual container are carried out the speed adjustment;
Loading module is used for the virtual container after handling is loaded into the payload part of described signal frame.
7. system as claimed in claim 6, it is characterized in that, described mapping block is further used for, speed according to described optical payload unit time slot signal, the quantity and being used to that is identified for the rate adjustment bytes of carrying user data is carried the quantity of the rate adjustment bytes of padding data, and, the data that are mapped in the described virtual container are carried out the speed adjustment by rate adjustment bytes carrying corresponding data with respective numbers.
8. system as claimed in claim 6 is characterized in that, described optical payload unit is ODU1, and described virtual container is C-4-9c; Described virtual container is divided module and is further used for, and C-4-9c is divided into 180 sub-pieces, wherein:
Have and comprise 11 data bytes and 2 rate adjustment bytes in the sub-piece;
Have and comprise 12 data bytes and 1 first byte of padding in the odd number height piece, have 6 fixed stuff R-Bits positions and 2 adjustment chances to judge bit in described first byte of padding, described 2 adjustment chances judge that bits are used for indicating respectively 2 to adjust byte data carried by data types;
Comprise 12 data bytes and 1 second byte of padding in all the other sub-pieces, 7 fixed stuff R-Bits positions are arranged in described second byte of padding.
9. system as claimed in claim 8 is characterized in that, described virtual container is divided module and is further used for, and the every row in 9 row of C-4-9c is divided into 5, and every is divided into 36 sub-pieces that comprise 13 bytes.
10. system as claimed in claim 8, it is characterized in that, described mapping block is further used for, and according to the speed of described optical payload unit time slot signal, the quantity M and being used to that is identified for the rate adjustment bytes of carrying user data carries the quantity N of the rate adjustment bytes of padding data; In the individual sub-piece of M, first in first byte of padding adjusted chance judge that the value of bit is changed to 1, and in the first rate adjustment byte corresponding, shine upon user data with the first adjustment chance judgement bit; In N sub-piece, second in first byte of padding adjusted chance judge that the value of bit is changed to 1, and in second rate adjustment bytes corresponding, write padding data with the second adjustment chance judgement bit.
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| CN200810179030A CN101742364B (en) | 2008-11-25 | 2008-11-25 | Method and system for mapping timeslot signal of optical payload unit to signal frame |
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| CN200810179030A CN101742364B (en) | 2008-11-25 | 2008-11-25 | Method and system for mapping timeslot signal of optical payload unit to signal frame |
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Cited By (4)
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| CN102025438A (en) * | 2010-12-23 | 2011-04-20 | 杭州依赛通信有限公司 | Enhancement-type PDH (plesiochronous digital hierarchy) frame format suitable for microwave communication and mapping method |
| CN105429726A (en) * | 2014-09-22 | 2016-03-23 | 华为技术有限公司 | Business mapping processing method of optical transport network, devices and system |
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| CN100373847C (en) * | 2004-12-14 | 2008-03-05 | 华为技术有限公司 | Method for transmitting low-speed service signal in OTN |
| CN101155006B (en) * | 2006-09-30 | 2011-10-26 | 华为技术有限公司 | Method and apparatus for fixed velocity service transmission |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102025438A (en) * | 2010-12-23 | 2011-04-20 | 杭州依赛通信有限公司 | Enhancement-type PDH (plesiochronous digital hierarchy) frame format suitable for microwave communication and mapping method |
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| CN105429726A (en) * | 2014-09-22 | 2016-03-23 | 华为技术有限公司 | Business mapping processing method of optical transport network, devices and system |
| CN105429726B (en) * | 2014-09-22 | 2018-01-23 | 华为技术有限公司 | Business mapping treatment method, the apparatus and system of Optical Transmission Network OTN |
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| CN111989933A (en) * | 2018-09-13 | 2020-11-24 | 华为技术有限公司 | Data transmission method and device in optical transport network |
| CN111989933B (en) * | 2018-09-13 | 2022-05-10 | 华为技术有限公司 | Data transmission method and device in optical transport network |
| WO2021139604A1 (en) * | 2020-01-08 | 2021-07-15 | 华为技术有限公司 | Optical signal transmission method and related apparatus |
| US11910135B2 (en) | 2020-01-08 | 2024-02-20 | Huawei Technologies Co., Ltd. | Optical signal transmission method and related apparatus |
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