In integrated services digital networks (ISDN), the part of the bit stream through a framed interface used for telecommunications services and signaling.

Synonym point of interface.

The gross bit rate of the signal at the boundary between the physical layer and the physical medium. [T1.107-1988]

A standard that describes one or more functional characteristics (such as code conversion, line assignments, or protocol compliance) or physical characteristics (such as electrical, mechanical, or optical characteristics) necessary to allow the exchange of information between two or more (usually different) systems or equipment.
Note 1: An interface standard may include operational characteristics and acceptable levels of performance.
Note 2:… (Read More →)

1. In a system, a shared boundary, i.e., the boundary between two subsystems or two devices.
2. A shared boundary between two functional units, defined by specific attributes, such as functional characteristics, common physical interconnection characteristics, and signal characteristics.
3. A point of communication between two or more processes, persons, or other physical entities.
4. A point of interconnection between… (Read More →)

1. In general, extraneous energy, from natural or man-made sources, that impedes the reception of desired signals.
2. A coherent emission having a relatively narrow spectral content, e.g., a radio emission from another transmitter at approximately the same frequency, or having a harmonic frequency approximately the same as, another emission of interest to a given recipient, and which impedes reception… (Read More →)

Emission that results in an electrical signal's being propagated into, and interfering with the proper operation of, electronic or electrical equipment.
Note: The frequency range of interference emissions may include the entire electromagnetic spectrum.

An optical filter that reflects one or more spectral bands or lines and transmits others, while maintaining a nearly zero coefficient of absorption for all wavelengths of interest.
Note 1: An interference filter may be high-pass, low-pass, bandpass, or band-rejection.
Note 2: An interference filter consists of multiple thin layers of dielectric material having different refractive indices. There also may… (Read More →)

The locus of points surrounding a transmitter where the predicted median field strength of the signal from that transmitter is the maximum field strength that is not considered to cause interference at the service contour of another transmitter. [47CFR]

An instrument that uses the principle of interference of electromagnetic waves for purposes of measurement.
Note: Interferometers may be used to measure a variety of physical variables, such as displacement (distance), temperature, pressure, and strain.