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.

In ISDN, a logical point between two, nonoverlapping functional groups.
Note: When equipment is placed at a reference point, that reference point is designated an interface.

In optical-fiber technology, that surface of an optical fiber that is used to contact the transverse-alignment elements of a component such as a connector or mechanical splice.
Note: For telecommunications-grade fibers, the reference surface is the outer surface of the cladding. For plastic-clad silica (PCS) fibers, which have a strippable polymer cladding (not to be confused with the polymer overcoat… (Read More →)

A group of related reference circuits.

See relative transmission level, transmission level point.