> I also think that https://en.wikipedia.org/wiki/Line_code is the term you're looking for.
In 10G ethernet phy's, it's a multiplicative (self-synchronizing) scramblers [1] and does not use line code. From what I remember, it's statistically fine, and plays into LDPC correction easier.
[1] https://www.iol.unh.edu/sites/default/files/knowledgebase/10...