Principal clock

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."

References

•  This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C" (in support of MIL-STD-188).