Principal clock
From HandWiki
Short description: Clock selected for normal use in telecommunications
In telecommunications, the principal clock of a set of redundant clocks, is the clock that is selected for normal use. The principal clock may be selected because of a property, e.g. superior accuracy, that makes it a unique member of the set.
The term "principal clock" should not be confused with, or used as a synonym for, the term "primary frequency standard."
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