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Transition Areas Between Indoor And Outdoor Areas
An outside area directly between two buildings with complete indoor protection will need no additional
Receivers between the buildings, if they are 90 m (300 ft.) or less apart.
When protecting an outside area directly between two buildings with complete indoor protection and they are
more than 90 m (300 ft.) apart; place a row of outside Receivers evenly spaced between the buildings. Make
sure the receiver row does not exceed the standard 90 m (300 ft.) spacing from the buildings. The spacing
between receivers in that row should be about the same as the spacing for the receivers in the buildings.
Indoor receivers should be no more than 25 m (80 ft.) apart and outdoor receivers should be no more 90 m
(300 ft.) apart. Both of these recommendations work well in their respective areas. However this means that
where a building is adjacent to an outdoor area, that the building will have a greater density of receivers and
therefore will have a tendency to pull the computed location towards it. To counteract the building tendency to
pull the location consider the following special cases:
If the outdoor area adjacent to the building is wide open and the customer is not concerned about
reduced location accuracy in this area, then nothing special needs to be done. Follow the normal indoor
and outdoor recommendations.
The building is near the boundary of the protected area, with or without a fence at the boundary. The
receivers in the building should be placed at the recommended 25 m (80 ft.) spacing. The receivers at
the boundary of the protected area near the building should be spaced about the same as those in the
building, approximating the same grid as used in the building.
The building is adjacent to a large protected outdoor area that extends for more than 90 m (300 ft.) from
the building. The receivers in the building should be placed at the recommended 25 m (80 ft.) spacing.
The receivers in the large protected outdoor area should be placed on the normal 90 m (300 ft.) grid
except for the first row of receivers adjacent to the building. This first row of outdoor receivers in the
transition area should "split the difference" between the indoor and outdoor spacing at about 60 m (200
ft.).
Boundary Areas at the Outer Edge of the Protected Area
The system cannot locate an alarm past the last receiver at the boundary of the protected area. Therefore, the
last row of receivers must be at or past the end of the protected area.
Security Escort Training
Page 23 of 142
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