1. A clock with which another clock is compared.
2. A clock, usually of high stability and accuracy, used to govern a network of mutually synchronized clocks of lower stability.
Note: The failure of a reference clock does not necessarily cause loss of synchronism.

The geometric representation of colors in three-dimensional space. [CIE 845-03-25]
Note: There are three reference spaces recognized by ISO 8613: CMYK color space; CIELuv color space, and R,G,B color space. [After SMPTE]

In ISDN, a combination and arrangement of functional groups and reference points that reflect possible network topology.

an information transfer between two server application processes acting cooperatively on instructions from a third application process.

1. A standard fixed frequency from which operational frequencies may be derived or with which they may be compared.
Note: The reference frequency may be used to specify an assigned frequency or fix a characteristic or carrier frequency.
2. A frequency having a fixed and specific position with respect to the assigned frequency. The displacement of this frequency with respect… (Read More →)

A set of conventions and concepts, mutually agreed upon between the information system user and provider communities [POSIX.0].

1. A video display that is used to view a video signal to determine its image quality.
2. [An] Access control concept referring to an abstract machine that mediates all accesses to objects by subjects. [INFOSEC-99]
3. In security, the concept of an abstract machine that enforces target-of-evaluation (TOE) access control policies and security processes. [After CC-99]

1. An access control concept that refers to monitoring of all accesses to objects by subjects [CESG].
2. An access control concept that refers to an abstract machine that mediates all accesses to objects by subjects [TCSEC].

An access control concept utilizing an abstract machine to mediate all access to objects by subjects.

The magnitude of circuit noise chosen as a reference for measurement.
Note: Many different levels with a number of different weightings are in current use, and care must be taken to ensure that the proper parameters are stated. See dBa, dBa0, dBm, dBm0, dBrn, dBrnC, dBrnC0, dBx.