Service mapping processing method for optical transport network, apparatus, and system
A service mapping processing method for an optical transport network, an apparatus, and a system are provided, where the method includes: generating mapping adaptation indication information according to a mapping granularity of a to-be-carried LO ODU, where the mapping granularity is M×g bytes, M is a quantity of timeslots occupied by the to-be-carried LO ODU in an OPUCn, g is a size of a mapping granularity corresponding to each timeslot of the timeslots occupied by the LO ODU, and g is a positive integer greater than 1; mapping, according to the mapping adaptation indication information, the to-be-carried LO ODU to an ODTUCn.M payload area; encapsulating the mapping adaptation indication information into the ODTUCn.M overhead area; encapsulating the ODTUCn.M into an OTUCn; and sending the OTUCn to a receive end device. The method avoids that OTUCns that use different mapping granularities cannot interwork between a receive end and a transmit end.
1. A transmitting method, the method comprising:
obtaining a to-be-carried low order (LO) optical channel data unit (ODU);
determining a quantity of data entities that the to-be-carried LO ODU has in a unit of a mapping granularity, wherein a quantity of bytes in the mapping granularity divided by a quantity of tributary slots that the to-be-carried LO ODU occupies in an Optical Transport Unit Cn (OTUCn) is equal to an integer greater than 1, wherein the OTUCn has a bit rate of one or multiple times of 100 Gbit/s;
mapping the to-be-carried LO ODU into a payload area of the OTUCn according to the quantity of data entities; and
sending the OTUCn to a receiving end device.
2. The method according to claim 1 , wherein the mapping the to-be-carried LO ODU into the payload area of the OTUCn according to the quantity of data entities comprises:
mapping the to-be-carried LO ODU into an optical channel data tributary unit Cn.M (ODTUCn.M) according to the quantity of data entities; and
mapping the ODTUCn.M into the OTUCn.
3. The method according to claim 2 , further comprising:
mapping the information representing the mapping granularity that the to-be-carried LO ODU uses into an overhead area of the ODTUCn.M.
4. The method according to claim 2 , wherein the determining the quantity of data entities that the to-be-carried LO ODU has in the unit of the mapping granularity comprises:
obtaining by calculation, the quantity of data entities that the to-be-carried LO ODU has in the unit of the mapping granularity, according to the quantity of tributary slots that the to-be-carried LO ODU occupies in the OTUCn, the mapping granularity that the to-be-carried LO ODU uses when the to-be-carried LO ODU maps to the ODTUCn.M, and a quantity of bytes of the to-be-carried LO ODU.
5. The method according to claim 4 , further comprising:
determining clock information of the to-be-carried LO ODU;
wherein the clock information of the to-be-carried LO ODU is determined according to the quantity of tributary slots that the to-be-carried LO ODU occupies in the OTUCn, the mapping granularity that the to-be-carried LO ODU uses when the to-be-carried LO ODU maps to the ODTUCn.M, and the quantity of bytes of the to-be-carried LO ODU.
6. The method according to claim 2 , further comprising:
mapping information of the quantity of tributary slots that the to-be-carried LO ODU occupies in the OTUCn into an overhead area of the ODTUCn.M.
7. The method according to claim 2 , further comprising:
encapsulating the quantity of data entities that the to-be-carried LO ODU has in an overhead area of the ODTUCn.M.
8. The method according to claim 1 , wherein the quantity of bytes in the mapping granularity divided by the quantity of tributary slots that the to-be-carried LO ODU occupies in the OTUCn is equal to 16.
9. The method according to claim 1 , further comprising:
determining clock information of the to-be-carried LO ODU.
10. The method according to claim 1 , further comprising:
obtaining a second to-be-carried LO ODU;
determining a quantity of data entities that the second to-be-carried LO ODU has in a unit of a second mapping granularity, wherein a quantity of bytes in the second mapping granularity divided by the quantity of tributary slots that the second to-be-carried LO ODU occupies in the OTUCn is equal to an integer greater than 1 and is not equal to the quantity of bytes in the mapping granularity divided by the quantity of tributary slots that the to-be-carried LO ODU occupies in the OTUCn; and
mapping the second to-be-carried LO ODU into the payload area of the OTUCn in the another mapping granularity.
11. An apparatus, comprising:
a processor configured to:
obtain a to-be-carried low order (LO) optical channel data unit (ODU);
determine a quantity of data entities that the to-be-carried LO ODU has in a unit of a mapping granularity, wherein a quantity of bytes in the mapping granularity divided by a quantity of tributary slots that the to-be-carried LO ODU occupies in an Optical Transport Unit Cn (OTUCn) is equal to an integer greater than 1, wherein the OTUCn has a bit rate of multiple times of 100 Gbit/s; and
map the to-be-carried LO ODU into a payload area of the OTUCn according to the quantity of data entities; and
a transmitter configured to send the OTUCn to a receiving end device.
12. The apparatus according to claim 11 , wherein the mapping the to-be-carried LO ODU into the payload area of the OTUCn according to the quantity of data entities comprises:
mapping the to-be-carried LO ODU into an optical channel data tributary unit Cn.M (ODTUCn.M) according to the quantity of data entities; and
mapping the ODTUCn.M into the OTUCn.
13. The apparatus according to claim 12 , wherein the processor is further configured to:
map the information representing the mapping granularity that the to-be-carried LO ODU uses into an overhead area of the ODTUCn.M.
14. The apparatus according to claim 12 , wherein the determining the quantity of data entities that the to-be-carried LO ODU has in the unit of the mapping granularity comprises:
obtaining by calculation, the quantity of data entities that the to-be-carried LO ODU has in the unit of the mapping granularity, according to the quantity of tributary slots that the to-be-carried LO ODU occupies in the OTUCn, the mapping granularity that the to-be-carried LO ODU uses when the to-be-carried LO ODU maps to the ODTUCn.M, and a quantity of bytes of the to-be-carried LO ODU.
15. The apparatus according to claim 14 , wherein the processor is further configured to:
determine clock information of the to-be-carried LO ODU;
wherein the clock information of the to-be-carried LO ODU is determined according to the quantity of tributary slots that the to-be-carried LO ODU occupies in the OTUCn, the mapping granularity that the to-be-carried LO ODU uses when the to-be-carried LO ODU maps to the ODTUCn.M, and the quantity of bytes of the ODU.
16. The apparatus according to claim 11 , wherein the quantity of bytes in the mapping granularity divided by the quantity of tributary slots that the to-be-carried LO ODU occupies in the OTUCn is equal to 16.
17. The apparatus according to claim 12 , wherein the processor is further configured to:
map information of the quantity of tributary slots that the to-be-carried LO ODU occupies in the OTUCn into an overhead area of the ODTUCn.M.
18. The apparatus according to claim 12 , wherein the processor is further configured to:
encapsulate the quantity of data entities that the to-be-carried LO ODU has in an overhead area of the ODTUCn.M.
19. The apparatus according to claim 11 , wherein the processor is further configured to:
determine clock information of the to-be-carried LO ODU.
20. A system comprising:
a receiving device; and
a transmitting device configured to:
obtain a to-be-carried low order (LO) optical channel data unit (ODU);
determine a quantity of data entities that the to-be-carried LO ODU has in a unit of a mapping granularity, wherein a quantity of bytes in the mapping granularity divided by a quantity of tributary slots that the to-be-carried LO ODU occupies in the an Optical Transport Unit Cn (OTUCn) is equal to an integer greater than 1, wherein the OTUCn has a bit rate of multiple times of 100 Gbit/s; and
map the to-be-carried LO ODU into a payload area of the the OTUCn according to the quantity of data entities; and
send the ODTUCn.M to the receiving device.