DATA TRANSMISSION METHOD AND APPARATUS

原文（中国語）

Embodiments of this application provide a data transmission method and an apparatus, and are applied to an optical transport network. The method includes: A sending device obtains service data, maps the service data to a data frame, and sends the data frame to a receiving device. The data frame includes an overhead area and a payload area, the payload area includes a plurality of blocks, the overhead area includes indication information, and the indication information indicates whether a block in the plurality of blocks in the payload area is a rate compensation block.