Equipment that switches or modifies voltage, frequency, or other characteristics of primary power.

A time standard that does not require calibration against another time standard.
Note 1: Primary time standards are realized in practice as primary frequency standards, time and frequency being the mathematical inverses of one another. Examples of primary frequency standards are cesium standards and hydrogen masers.
Note 2: By international agreement, the unit of time (the second) is defined in… (Read More →)

Traffic measured or studied during one or more study weeks for which data are collected and processed. Normally, a study period consists of four study weeks. [After T
1. Rpt 11-1991] Synonyms first-route traffic, study period.

An abstract, implementation-independent, interaction between a layer service user and a layer service provider. [T1.629-1999]

1. An initiator that is capable of initiating interactions on objects, which is not acting on behalf of, or by proxy, of another object. A Principal can be either a human user or an active object [10181-2].
2. An entity whose identity can be authenticated [ECMA138].

Of a set of redundant clocks, the clock that is selected for normal use.
Note 1: The principal clock may be selected because of a property, e.g., superior accuracy, that makes it a unique member of the set.
Note 2: The term "principal clock" should not be confused with, or used as a synonym for, the term "primary frequency standard.… (Read More →)

Synonym primary colors.

A point within a structure that provides a means to join conductors requiring an earth reference to grounding electrodes. This point may be a separate busbar located in the structure near the entrance of the grounding electrode conductor(s), or it may be a point on a grounding electrode. In a central office, the PGP is reference point 0.

A security design principle that states that a person, process, or program be granted only those privileges necessary to accomplish a legitimate function, and only for the time that such privileges are actually required. The proper application of this principle limits the damage that can result from accident, error, or unauthorized use of available privileges by a process [POSIX.6].

[In INFOSEC,] eliminating the display of characters in order to preserve their secrecy. [INFOSEC-99]