Traffic consisting of plain or encrypted messages written in a natural language and transmitted in accordance with standard formats and procedures.
Note: Examples of narrative traffic include (a) messages that are placed on paper tape and transmitted via a teletypewriter (TTY), and on reception, are converted back to a printed page on another teletypewriter or teleprinter and (b) messages printed… (Read More →)

A modem whose modulated output signal has an essential frequency spectrum that is limited to that which can be wholly contained within, and faithfully transmitted through, a voice channel with a nominal 4-kHz bandwidth.
Note: High frequency (HF) modems are limited to operation over a voice channel with a nominal 3-kHz bandwidth.

In narrowband radio, the nominal 3-kHz bandwidth allocated for single channel radio that provides a transmission path for analog and quasi-analog signals.

Any analog signal or analog representation of a digital signal whose essential spectral content is limited to that which can be contained within a voice channel of nominal 4-kHz bandwidth.
Note: Narrowband radio uses a voice channel with a nominal 3-kHz bandwidth.

National Advanced Spectrum and Communications Test Network (NIST)

1. Network Address Translation,
2. Network Address Translator.

Network Address Translation - Protocol Translator

Abbreviation for North American Telecommunications Association.

1. National Communications System (NCS) was initially established by President Kennedy in August
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3.  Executive Order 12472 formally established the role of the NCSto assist the President, the National Security Council, the Director of the Office of Science and Technology Policy, and the Director of the Office of Management and Budget, in the discharge of their national security emergency… (Read More →)

The joint telecommunications industry/Federal Government operation established by the National Communications System to assist in the initiation, coordination, restoration, and reconstitution of National Security or Emergency Preparedness (NS/EP) telecommunications services or facilities.