A set of digits and related indicators (type of number, numbering plan identification, screening indicator, presentation indicator) that provide numbering information related to the redirecting party. [T1.625-1993]

A system profile construction method of starting at a base platform and adding new services by allowing a service component to ask the base platform to redirect all requests for that type of service to the service component [POSIX.0].

A single-sideband emission in which the degree of carrier suppression enables the carrier to be reconstituted and to be used for demodulation. [NTIA] [RR]

A form of amplitude-modulation in which the carrier is transmitted at a controlled level below that which is required for demodulation, but at a level sufficient to serve as a frequency reference.

1. In the transmission of data, the excess of transmitted message symbols over that required to convey the essential information in a noise-free circuit.
Note: Redundancy may be introduced intentionally (as in the case of error detection or correction codes) or inadvertently (such as by oversampling a band-limited signal, inefficient formats, etc. ).
2. In a communication system, surplus capability… (Read More →)

1. A method of verifying that any redundant hardware or software in a communication system is in an operational condition.
2. A check that uses one or more extra binary digits or characters attached to data for the detection of errors.

A code using more signal elements than necessary to represent the intrinsic information.
Note: The redundancy may be used for error-control purposes.

An antenna that may be real, virtual, or theoretical, and has a radiation pattern that can be used as a basis of comparison with other antenna radiation patterns.
Note: Examples of reference antennas are unit dipoles, half-wave dipoles, and isotropic, i.e., omnidirectional antennas. [From Weik '89]

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

A hypothetical circuit of specified equivalent length and configuration, and having a defined transmission characteristic or characteristics, used primarily as a reference for measuring the performance of other, i.e., real, circuits or as a guide for planning and engineering of circuits and networks.
Note: Normally, several types of reference circuits are defined, with different configurations, because communications are required over… (Read More →)