In telephony, a change, as a function of temperature, in the shape of the frequency-vs. -attenuation response curve, i.e., characteristic, of a transmission line.

A pair of individually insulated conductors (wires) twisted together and treated as an entity in the transmission of electrical signals or power (e.g., from an electronic power supply to a circuit).
Note 1: In communications cables, the twisted pair is usually if not always composed of two individually insulated solid conductors (wires). In other applications, e.g., in a power-supply application,… (Read More →)

See paired cable.

A binary-coded decimal notation in which (a) each decimal digit is represented by a binary numeral consisting of five binary digits of which two are of one kind, called "ones," and three are of the other kind, called "zeros" and (b) the usual weights assigned to the digit positions are 0-1-2-3-6, except that "zero" is represented as 01100.

Code consisting of an encoding section, in which the vocabulary items (with their associated code groups) are arranged in alphabetical or other systematic order; and a decoding section, in which the code groups (with their associated meanings) are arranged in a separate alphabetical or numeric order. [INFOSEC-99]

Continuous surveillance and control of positive control material at all times by a minimum of two authorized individuals, each capable of detecting incorrect and unauthorized procedures with respect to the task being performed, and each familiar with established security and safety requirements. [INFOSEC-99]

[A] system of storage and handling designed to prohibit individual access to certain COMSEC keying material by requiring the presence of at least two authorized persons, each capable of detecting incorrect or unauthorized security procedures with respect to the task being performed. [INFOSEC-99]

In frequency-division multiplexed (FDM) systems, the use of two pilot frequencies within a band so that the differential change in attenuation with respect to temperature, i.e., twist, can be detected and compensated by a regulator.

The square root of the Allan variance.

Synonym Allan variance.