The ability of equipment to operate as expected during actual service conditions in a central office. [T1.304-1989]

A predefined set of complimentary security enforcing functions capable of being implemented in a Target of Evaluation [ITSEC].

Of a periodic wave, the sinusoidal component, i.e., Fourier component, having the lowest frequency.
Note: Every periodic waveform may be expressed as the summation of the fundamental and its harmonics. For example, a square wave may be expressed as the summation of sine waves equal in frequency to the fundamental and all odd harmonics, each frequency having an appropriate amplitude… (Read More →)

The lowest order mode of a waveguide.
Note: In optical fibers, the fundamental mode is designated LP01 or HE11.

Synonym break out.

1. A device that has as its critical component a metal wire or strip that will melt when heated by a prescribed (design) amperage, creating an open in the circuit of which it is a part, thereby protecting the circuit from an overcurrent condition.
Note: Fuses are often characterized as "fast-blow" or "slow-blow," according to the time required for them… (Read More →)

Synonym vitreous silica.

Synonym (in cryptosystems) linkage.

In fiber optics, a splice created by localized heating of the ends of the two fibers to be joined.
Note: A properly made fusion splice results in a continuous length of material with minimal discontinuities at the splice.

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