5.1.12. FRL Character Block and Super Block Mapping
Each Character Block contains up to 502 FRL characters transporting FRL packets and eight FRL characters carrying Reed-Solomon parity data.
Each FRL Super Block is preceded by a group of three or four Start Super Blocks (SSB) or a group of three or four Scrambler Reset (SR) characters. SSB and SR characters are comma characters used by a receiver for character alignment.
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