High cardinality and line dimenson

Hi

Are High cardinality and line dimenson both are dependent?

my understanding is that if the dimenson is more than 10% size of the fact table then we go for line dimenson. Highcardinality should be given only if the dimenson is more than 10% of fact table.By choosing line dimenson,fact table will be directly linked to sid table as there will be no dimenson table. Does it mean if I choose line dimenson, I can't go for high cardinality as there is no dimenson? Please let me know the relationship the between the two?

Thank you

Sriya