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.

[The] Portion of a trusted computing base whose normal function is to control access between subjects and objects and whose correct operation is essential to the protection of data in the system. [INFOSEC-99]

The artificially generated time history of an earthquake, derived from the histories of many actual earthquake accelerometers. The reference waveform is to be used for test performance. [T1.329-1995]
Note: The reference waveform is useful in CIP (communications infrastructure protection) efforts.

[In television,] The level corresponding to the specified maximum excursion of the luminance signal in the white direction. [47CFR]

The ratio of reflected power to incident power, generally expressed in dB or percent.

Synonym Gray code.

In the ionosphere, a layer that has a free-electron density sufficient to reflect radio waves.
Note 1: The principal reflecting layers are the E, F1, and F2 layers in the daylight hemisphere.
Note 2: A critical frequency is associated with the reflection by each layer.