Glossary:

ATIS Telecom Glossary

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Select a term name to open its entry and any media references. Longer definitions end with a “Read More” link.

unbalanced line

A transmission line, such as a coaxial cable, in which the magnitudes of the voltages on the two conductors are not equal with respect to ground.

unbalanced modulator

A modulator in which the modulation factor is different for the alternate half-cycles of the carrier. Synonym asymmetrical modulator.

unbundling

In the context of the FCC's Computer III Inquiry, the process of separating individual tariffed offerings and services that are associated with a specific element in the CEI or ONA tariff from other tariffed basic service offerings. [After para.158, FCC Report and Order, June 16,
198
6. ]

unclassified

Information that has not been determined pursuant to Executive Order (E. O. ) 12958 or any predecessor order to require protection against unauthorized disclosure and that is not designated as classified. [INFOSEC-99]

underflow

In computing, a condition occurring when a machine calculation produces a non-zero result that is smaller than the smallest non-zero quantity that the machine's storage unit is capable of storing or representing.

underground cable

A communication cable designed to be placed under the surface of the Earth in a duct system that isolates it from direct contact with the soil.

underground plant

Cable and wire plant, together with closures appropriate for the application, that is placed below ground in structures such as conduit or ducts. [T1.316-1997]

underlap

In facsimile, a defect that occurs when the width of the scanning line is less than the scanning pitch.

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