Patent ID: 8422515

Claim:
A method for transmitting data in an Optical Transport Network (OTN), comprising: obtaining at least one pair of Optical Channel Data Units- 0 (ODU 0 's); mapping the at least one pair of ODU 0 's to an Optical Channel Data Tributary Unit (ODTU) to form an ODTUvkt, wherein k is greater than or equal to 1, t is 2 or 3, k is smaller than t, and an external structure of the ODTUvkt is the same as an external structure of an Optical Channel Data Tributary Unit-kt (ODTUkt); and mapping the ODTUvkt to timeslot i and timeslot i+n of a timeslot cycle of a 1.25 G Optical Channel Data Unit-t (ODUt), indicating a type of at least one pair of ODU 0 's carried in the timeslot i to be Optical Channel Data Unit-k (ODUk), and transmitting the ODUk to a destination node, wherein n is number of timeslots in a timeslot cycle of a 2.5 G ODUt.