Patent ID: 7894482

Claim:
A method for mapping a client signal, comprising: dividing a part or all of a payload area of an Optical Channel Payload Unit (OPU) into several sub-blocks, wherein each of the sub-blocks has a size of N bytes, and N is an integer greater than 1; calculating, by a processor, a block number of the client signal to be transported according to the sub-block size of the payload area; generating mapping overhead (OH) information which comprises indication information of the block number of the client signal to be transported, and mapping the mapping OH information to an OH areaof Optical Transport Network (OTN) frame, wherein the indication information of the block number of the client signal to be transported comprises a bit reversal field and an increment/decrement indication field, and the bit reversal field and the increment/decrement indication field jointly indicate the block number of the client signal through bit reversal; determining a position distribution of the client signal to be transported in the sub-blocks of the payload area by using the block number; and mapping the client signal to be transported to corresponding sub-blocks of the payload area with an N-byte granularity according to the determined position distribution.