[A] physical keying material, such as printed key lists, punched or printed key tapes, or programmable, read-only memories (pROM). [INFOSEC-99]

Copper wire that has not been annealed after being drawn.

Pertaining to the condition of a facility with protective features that enable it to withstand destructive forces, such as explosions, natural disasters, or ionizing radiation.

1. Physical equipment as opposed to programs, procedures, rules, and associated documentation.
2. The generic term dealing with physical items as distinguished from its capability or function such as equipment, tools, implements, instruments, devices, sets, fittings, trimmings, assemblies, subassemblies, components, and parts. The term is often used in regard to the stage of development, as in the passage of a… (Read More →)

Synonym platform.

1. To connect equipment or components permanently in contrast to using switches, plugs, or connectors.
2. To wire in fixed logic or read-only storage that cannot be altered by program changes.

[A] permanently installed key. [INFOSEC-99]

1. Any emission, radiation, or induction interference that endangers the functioning or seriously degrades, obstructs, or repeatedly interrupts a communications system, such as a radio navigation service, telecommunications service, radio communications service, search and rescue service, or weather service, operating in accordance with approved standards, regulations, and procedures.
Note: To be considered harmful interference, the interference must cause serious detrimental… (Read More →)

1. Of a sinusoidal wave, an integral multiple of the frequency of the wave.
Note: The frequency of the sine wave is called the fundamental frequency or the first harmonic, the second harmonic is twice the fundamental frequency, the third harmonic is thrice the fundamental frequency, etc.
2. Of a periodic signal or other periodic phenomenon, such as an electromagnetic… (Read More →)

In the output signal of a device, distortion caused by the presence of frequencies that are not present in the input signal.
Note: Harmonic distortion is caused by nonlinearities within the device.