Data transmission method and device

A data transmission method, comprising:

• receiving an optical channel data unit (ODU) frame from an optical transport network (OTN) device;
• demapping an optical channel payload unit (OPU) in the ODU frame to obtain a second code stream and frame header indication information indicating a frame header location of the second code stream;
• and
• encoding the second code stream according to the frame header indication information to obtain a first code stream, wherein when the first code stream is a 10B code stream, the second code stream is an 8B code stream, and when the first code stream is a 66B code stream, the second code stream is a 64B code stream, and wherein the first code stream is obtained by encoding common public radio interface (CPRI) service data.

A device, comprising a processor, configured to:

• determine synchronization header indication information indicating a frame header location of a first code stream, wherein the first code stream is obtained by encoding common public radio interface (CPRI) service data;
• decode the first code stream to obtain a second code stream, wherein when the first code stream is a 10B code stream, the second code stream is an 8B code stream, and when the first code stream is a 66B code stream, the second code stream is a 64B code stream;
• insert frame header indication information indicating a frame header location of the second code stream into the second code stream according to the synchronization header indication information;
• and
• map the second code stream and the frame header indication information into an optical channel payload unit (OPU) in an optical channel data unit (ODU) frame.