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.

national prefix

A digit or combination of digits to be dialed by a calling subscriber, making a call to a subscriber in his own country but outside his own numbering area. It provides access to the automatic outgoing trunk equipment. [CCITT E.160] [T
1. Rpt30-1994]

National Security and Emergency Preparedness Telecommunications (NS/EP Telecommunications)

NS/EP is the acronym for National Security and Emergency Preparedness. NS/EP communications are survivable, resilient, enduring, and effective communications services that are used to maintain a state of readiness or to respond to and manage any event or crisis (local, national, or international) that causes or could cause injury or harm to the population, damage to or loss of property,… (Read More →)

national security information (NSI)

Information that has been determined, pursuant to Executive Order 12958 or any predecessor order, to require protection against unauthorized disclosure. [INFOSEC-99]

national security system

Any telecommunications or information system operated by the United States Government, the function, operation, or use of which: (a) involves intelligence activities; (b) involves cryptologic activities related to national security; (c) involves command and control of military forces; (d) involves equipment that is an integral part of a weapon or weapon system; or (e) is critical to the direct fulfillment… (Read More →)

natural frequency

Of an antenna, the lowest frequency at which the antenna resonates without the addition of any inductance or capacitance.

nautical mile (nmi)

A unit of distance used in navigation and based on the length of one minute of arc taken along a great circle.
Note 1: Because the Earth is not a perfect sphere, various values have been assigned to the nautical mile. The value 1852 meters (607
6. 1 ft. ) has been adopted internationally.
Note 2: The nautical mile is… (Read More →)

navigate

To move around (a) within a series of Web pages, or (b) among different Web pages, by following hyperlinked paths within each document. Synonyms browsing, surfing [slang].

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