A code in which "1s" are represented by a change in a significant condition and "0s" are represented by no change.

A binary encoding scheme in which a signal parameter, such as electric current or voltage, undergoes a change in a significant condition or level every time that a "one" occurs, but when a "zero" occurs, it remains the same, i.e., no transition occurs.
Note 1: The transitions could also occur only when "zeros" occur and not when "ones" occur. If… (Read More →)

Synonym non-return-to-zero mark.

A binary encoding scheme in which a signal parameter, such as electric current or voltage, undergoes a change in a significant condition or level every time that a "zero" occurs, but when a "one" occurs, it remains the same, i.e., no transition occurs.
Note 1: The transitions could also occur only when "ones" occur and not when "zeros" occur. If… (Read More →)

Non-terrestrial networks (NTN) are networks or segments of networks that use either Uncrewed Aircraft Systems (UAS) operating typically between 8 and 50km altitudes, including High Altitude Platforms (HAPs) or satellites in different constellations to carry a transmission equipment relay node or a base station.

A loopback in which the signal transmitted beyond the loopback point (the forward signal) when the loopback is activated, is not the same as the received signal at the loopback point. The forward signal may be a defined signal or unspecified. [T1.216-1998]

A form of common-channel signaling where the signaling channel serves one or more trunk groups, at least one of which terminates at a point other than the signal transfer point at which the signaling channel terminates.

The signaling mode in which messages involving two (nonadjacent) signaling points are communicated between them over two or more signaling links in tandem passing through one or more signaling transfer points other than those which are the origin and destination of the messages. [T1.226-1992]

A switch that has enough paths across it that an originated call can always reach an available line without encountering a busy condition.

In cryptography, a time-variant parameter, such as a counter or a time stamp, that is used in key management protocols to prevent message replay and other types of attacks. [After X9.42]