Quantcast Exterior IDS Layout and System Compatibility

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for which the disturbance threshold level for activating the sensor is very
high, but within the level of that created by an intruder.  In general,
exterior perimeter IDSs are not recommended unless specifically required by
DoD instruction or regulation.  This is discussed further in par. 4.5.3
Exterior IDS Layout and System Compatibility.  Any required
exterior site IDS must be identified and included during the planning of the
site layout.  The IDS required cannot be completely identified until the
proposed site layout plan has been established.  As noted, an exterior IDS
designed to provide detection along a long fence line may result in high
system costs for installation, operation and maintenance.  Detection and
assessment sensors nearer or on the exterior of the facility being protected
are often more effective from a performance and cost point of view.  In any
case, even when intrusion detection sensors and fences are located close to
the facility, if the facility delay time is too low the time available for
effective security force response may not be adequate.  As emphasized in
Section 3, ensuring that resources are wisely spent requires that the
relationship between exterior sensor location, delay times, and security
force response times must be carefully examined.
1)  Exterior Site Perimeter Detection.  Detectors employed along
the perimeter of the site initiate the timeline of an intrusion at that
point. Such detectors may be employed on the fence, such as strain-sensitive
cable, or between fences, such as buried, ported coax, bistatic microwave, or
infrared beam sensors.  These sensors are described in par. 4.5.4.  CCTV or
guard personnel in towers or responding to the site are also needed for
threat assessment.
2)  Detection at Building Exterior.  To take advantage of the
delay provided by walls, floors, ceilings, etc., detectors may be employed on
or within the surfaces of the building exterior.  An example is vibration
sensors mounted on walls to detect an intrusion attack.  Another is the use
of a buried ported coax sensor around the outside of the building.  These
systems are described in par. 4.4.5.
Minimum Requirements for Exterior IDS.  Exterior IDS is required by
military regulation only for certain facilities and resources.  When
required, the exterior IDS should be selected for the best performance
considering such prevailing local environmental conditions as soil,
topography, weather, and other factors.  These factors can adversely affect
performance or increase false alarm (an alarm without a known cause) rates.
New exterior IDS must be an approved DoD standardized system or utilize
commercial equipment.  Existing installed IDS not meeting these standards may
continue to be used until replacement is necessary.  Minimum exterior IDS
requirements should be based on security system levels defined in DoD
5200.8-R for facilities and resources (see par., Figure 2).


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