A standard analog signal compression algorithm, used in digital communications systems of the North American digital hierarchy, to optimize, i.e., modify, the dynamic range of an analog signal prior to digitizing.
Note: The wide dynamic range of speech does not lend itself well to efficient linear digital encoding. Mu-law encoding effectively reduces the dynamic range of the signal, thereby increasing… (Read More →)

Equipment that is sufficiently rugged to withstand adverse environments.
Note: A mudbox is expected to operate unsheltered on the ground.

Abbreviation for maximum usable frequency.

Acronym for multiplexer/ demultiplexer.

The capability resulting from the portability order that enabled multiple carriers to use the LEC Features such as Percent Allocation in the SMS/800 to support the same Toll Free Number for the same Toll Free End User subscriber.

An exchange area in which are located two or more local central office buildings or wire centers. [47 CFR Pt.36-A]

Comprising or containing information of more than one security class [CESG].

A device required to store or process information of more than one security class simultaneously [CESG].

An antenna consisting of an arrangement of multiple dipole antennas.
Note: Various directivity patterns may be obtained by varying the arrangement of the dipoles and the way they are driven.

A computer that is connected to more than one physical data link; these data links may or may not be attached to the same network. [Bahorsky]