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SIGNAL GROUND REFERENCE POINT.  Same as a Signal Ground Reference Plane but
serving one of several Limited Exclusion Areas vice equipment or Terminal
SIGNAL REFERENCE SUBSYSTEM.  This subsystem provides the reference points for
all signal grounding to control static charges, noise and interference.  It
may be comprised of any one or any combination of the lower frequency network,
higher frequency network, or hybrid signal reference network.
SIGNAL RETURN.  A current-carrying path between a load and the signal source.
It is the low side of the closed loop energy transfer circuit between a
source-load pair.
SINGLE POINT GROUND.  The basic technique used in RED/BLACK installation in
which separate ground conductors are used for the various grounding functions
(signal, power, hazard, and so forth) with each conductor connected directly
or indirectly to a single point (Signal Ground Point).
SPURIOUS SIGNALS.  Undesirable signals appearing external to equipment or a
circuit.  They may be harmonics of existing desired signals, high frequency
components of complex wave shapes, or signals produced by incidental
oscillatory circuits.
SUSCEPTIBILITY.  The degree to which an electronic equipment, subsystem, or
system evidences undesirable responses when subjected to electromagnetic
TEMPEST.  An unclassified short name referring to investigations and studies
of compromising emanations.  It is sometimes used synonymously for the term
"compromising emanations":  For example, TEMPEST tests, TEMPEST inspection.
TRANSIENTS.  Single-shot impulses or pulses of low repetition rates generated
by switching action, by relay closures or other cyclic events.
UNDESIRABLE SIGNAL.  Any signal which tends to produce degradation in the
WAVE IMPEDANCE.  The ratio of the electric field strength to the magnetic
field strength at the point of observation.


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