Forward error correction synchronization method and forward error correction synchronization system capable of recovering synchronization of forward error correction blocks

A forward error correction (FEC) synchronization system comprising:

• a source terminal comprising:
• an 8b/10b encoder;
• and
• an FEC encoder coupled to the 8b/10b encoder;
• and
• a sink terminal linked to the source terminal, the sink terminal comprising:
• a 10b/8b decoder;
• and
• an FEC decoder coupled to the 10b/8b decoder;
• wherein after a link between the source terminal and the sink terminal is established, the source terminal transmits an FEC enable sequence to the sink terminal after the FEC encoder of the source terminal is enabled, the source terminal periodically transmits a tagged symbol to the sink terminal, the sink terminal identifies the tagged symbol after the tagged symbol is received by the sink terminal, the sink terminal collects a plurality of symbols transmitted from the source terminal after the tagged symbol is successfully identified, the plurality of symbols constitute a plurality of FEC blocks received by the sink terminal, the sink terminal recovers synchronization of the plurality of FEC blocks between the source terminal and the sink terminal according to the tagged symbol when the FEC enable sequence is undetected by the sink terminal, and the tagged symbol comprises predefined patterns.