In information assurance, a sector that is written on a diskette track in excess of the standard number of sectors, as part of a method of copy protection. [2382-pt.8]

In information assurance, a track that is written on a diskette in excess of the standard number of tracks, as part of a method of copy protection. [2382-pt.8]

[The] capability of crypto-equipment or secure telecommunications equipment to resist efforts to extract [the] key. [INFOSEC-99]

An intranet that has been extended to include access to or from selected external organizations such as customers or suppliers, but not the general public.
Note: Connections may be via leased lines, dial-up connections, or network interconnections. The overall network may be, but is not necessarily, a virtual private network. [After 2382-pt.35]

Frequencies from 30 GHz to 300 GHz. See electromagnetic spectrum.

Frequencies from 30 Hz to 300 Hz. See electromagnetic spectrum.

For an optical fiber, that portion of a joint loss that is not intrinsic to the fibers, e.g., loss caused by end separation, angular misalignment, or lateral misalignment.

An oscilloscope display in which a pseudorandom digital data signal from a receiver is repetitively sampled and applied to the vertical input, while the data rate is used to trigger the horizontal sweep.
Note: System performance information can be derived by analyzing the display. An open eye pattern corresponds to minimal signal distortion. Distortion of the signal waveform due to… (Read More →)

A message marker for a special-category message that is intended for delivery only to a specific person, or authorized representative of that person, and therefore no one else. [From Weik '89]

See F region.