Data transmission method, apparatus, device, system, and readable storage medium

A data transmission apparatus, wherein the apparatus is used in a first module, and the apparatus comprises:

• a non-transitory memory storing instructions;
• and
• a processor coupled to the non-transitory memory;
• wherein the instructions, when executed by the processor, cause the apparatus to be configured to:
• obtain first data, wherein the first data is data that is encoded by using a first forward error correction (FEC) code type and on which first processing is performed, and the first processing comprises interleaving processing;
• encode the first data based on a second FEC code type, to obtain a plurality of second codewords;
• perform second processing on the plurality of second codewords to obtain second data;
• and
• transmit the second data.

A data transmission apparatus, wherein the apparatus is used in a third module, and the apparatus comprises:

• a non-transitory memory storing instructions;
• and
• a processor coupled to the non-transitory memory;
• wherein the instructions, when executed by the processor, cause the apparatus to be configured to:
• obtain second data, wherein the second data is data obtained by encoding first data by using a second forward error correction (FEC) code type and performing second processing, the first data is data that is encoded by using a first FEC code type and on which first processing is performed, and the first processing comprises interleaving processing;
• and
• decode the second data based on the second FEC code type, to obtain decoded data.