Transmission method and apparatus, and optical communication device and storage medium

A method for transmission, applied to a second device and comprising:

• receiving, by the second device, a second frame, wherein the second frame comprises a first parameter and does not comprise a second parameter, the first parameter represents a number of m-bit client data entities, and the second parameter represents a difference between a number of n-bit client data entities and
• m
• n
• ×
• C
• m
• .

A method for transmission, applied to a third device and comprising:

• receiving, by the third device, a processed second frame from a second device, wherein the processed second frame comprises a first parameter and does not comprise a second parameter;
• the first parameter represents a number of m-bit client data entities;
• the second parameter represents a difference between a number of n-bit client data entities and
• m
• n
• ×
• C
• m
• ;
• and the processed second frame further comprises a first phase offset, and the first phase offset represents an accumulated phase offset of the second frame resulted after passing through all second device(s) comprising the second device from a first device;
• and
• processing the processed second frame based on the first parameter to obtain a first frame, and obtaining clock information or frequency information of the first frame based on the first phase offset.