Signal transmission method and apparatus, and related devices and storage medium

A method for signal transmission, comprising:

• receiving a second frame, wherein the second frame comprises a fine grain optical data unit (fgODU) frame;
• demapping a first frame from a payload area of the second frame, wherein the first frame comprises an administration unit (AU) frame or a tributary unit group (TUG) frame or a tributary unit (TU) frame;
• and
• obtaining a first signal corresponding to the first frame, wherein the first signal comprises a synchronous transport module (STM)-N signal or an E1 signal.

A first device, comprising:

• a first communication interface;
• and
• a first processor,
• wherein the first processor is configured to:
• obtain a first frame corresponding to a first signal, wherein the first signal comprises a synchronous transport module (STM)-N signal or an E1 signal, and the first frame comprises an administration unit (AU) frame or a tributary unit group (TUG) frame or a tributary unit (TU) frame;
• map the first frame to a payload area of a second frame, wherein the second frame comprises a fine grain optical data unit (fgODU) frame;
• and
• transmit the second frame through the first communication interface.