The transfer of digital information between two access points or reference points. Values associated with this attribute are appropriate bit rate (in circuit mode) and throughput rate (in packet mode). [T1.603-1990] [T1.604-1990]

1. A channel capable of transmitting all the information required for communication, such as user data, synchronizing sequences, and control signals.
Note: The information-bearer channel may operate at a higher data rate than that required for user data alone.
2. A basic communications channel with the necessary bandwidth but without enhanced or value-added services.

In an information-transfer transaction, the phase during which user information blocks are transferred from the source user to a destination user.

A coordinated sequence of user and telecommunications system actions that cause information present at a source user to become present at a destination user.
Note: An information-transfer transaction usually consists of three consecutive phases called the access phase, the information-transfer phase, and the disengagement phase.

Acronym for information systems security.

The region of the electromagnetic spectrum bounded by the long-wavelength extreme of the visible spectrum (approximately
0. 7 m) and the shortest microwaves (approximately
0. 1 mm). See electromagnetic spectrum.

Preemptive or reactive risk-management techniques designed to increase confidence that disruption of a system will be minimized if its critical infrastructure is attacked.

Preemptive or reactive risk-management techniques designed to prevent disruption of a system after its critical infrastructure is attacked.

A signal that prevents the occurrence of an event.
Note: An inhibiting signal may be used, for example, to disable an AND gate, thus preventing any signals from passing through it as long as the inhibiting signal is present. [From Weik '89]

A procedure used to qualify a signaling link for carriage of signaling traffic, either for the first time or after failure has occurred. [T1.226-1992]