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 RED DESIGNATION. A designation applied to: (1) all communication-electronic
(CE) equipment within the terminal or switching facility carrying classified
plain-language; (2) all (CE) between the encrypted side of the on-line
crypto-equipment used and individual subscriber sets or terminal equipment;
(3) equipment and sets originating or terminating classified plain-language
processing equipment; and (4) areas containing these wirelines, equipment, and
their interconnecting and auxiliary facilities.
RED EQUIPMENT AREA (REA). The space within a Limited Exclusion Area (LEA)
which is designated for installation of RED information processing equipment,
power, signal, control, ground feeder and distribution facilities.
REFLECTION COEFFICIENT. The ratio of the phasor magnitude of the reflected
wave to the phasor magnitude of the incident wave under specified conditions.
REFLECTION LOSS. The portion of the transition loss, expressed in dB, that is
due to the reflection of power at a barrier or shield. Reflection loss is
determined by the magnitude of the wave impedance inside the barrier relative
to the wave impedance in the propagation medium outside the barrier.
RF-TIGHT.
Offering a high degree of electromagnetic shielding effectiveness.
SHIELD. A housing, screen, or cover which substantially reduces the coupling
of electric and magnetic fields into or out of circuits or prevents the
accidental contact of objects or persons with parts or components operating at
hazardous voltage levels.
SHIELDED ENCLOSURE. An area (room or box) specifically designed to attenuate
electromagnetic radiation, or electromagnetic radiation and acoustic
emanation, originating either inside or outside the area. Necessary openings
in shielded enclosures, such as doors, air vents, and electrical feedthroughs,
are specially designed to maintain this attenuation.
SHIELDING EFFECTIVENESS (SE). A measure of the reduction or attenuation in
the electromagnetic field strength at a point in space caused by the insertion
of a shield between the source and that point.
SIGNAL GROUND BUS. A component of the signal ground system which is utilized
primarily to connect Signal Ground Reference Planes to the Signal Ground
Planes.
SIGNAL GROUND PLANE. An intermediate grounding point insulated from and
installed in, on, or near the Main Distribution Frame, Intermediate
Distribution Frame, Classified Intermediate Distribution Frame and connected
to the Signal Ground Point.
SIGNAL GROUND POINT. A single designated point in a station to which all
RED/BLACK grounds are either directly or indirectly connected. This point
serves as the common zero potential reference for the station.
SIGNAL GROUND REFERENCE PLANE. An intermediate focal point between an
equipment and the Signal Ground Plane for terminating an equipment's or
Terminal System's RED or BLACK ground circuits. The Signal Ground Reference
Plane is isolated from the equipment's AC Protective Ground and is connected
to the Signal Ground Plane by a Signal Ground Bus.
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