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To draw a wall or other obstructions (e.g.,
doors or windows) on the floor plan, press the wall drawing tool
button and select one of the pre-defined wall types, for example
“Brick wall” or “Interior office window.” You should select the
type that best matches the actual wall you are going to draw. You
can also select one of the two drawing modes: Line or Polygonal
path. If you selected
the Line mode, left-click on the floor plan to start
a new wall and left-click once again in a new location to finish
the wall. A straight line representing the wall will be drawn. If
you selected the Polygonal path
mode, left-click on the floor
plan to start a new wall and left-click every time you need to
start a new line segment. This will draw a connected series of line
segments. To finish the wall, right-click on the floor plan or
press the ESC key. You can move or resize the walls that you have
drawn. To move a wall, select it and drag it with the left mouse
button to a new position. To resize a wall or wall segment, select
it, move the mouse over the vertex (shown as a white circle), click
on it, and drag it with the left mouse button to a new
position.
After the wall has been drawn,
you can change its properties in the Obstruction
Properties dialog. To
display this dialog, double-click on a wall or select the
Properties
context menu item. In the
dialog window, you can change the obstruction type by selecting one
of the existing presets or modify obstruction characteristics such
as attenuation, reflection, or color. Attenuation
is a drop in strength measured
in dB that the RF signal experiences when it passes through the
obstruction. Because materials might attenuate differently at
different frequencies, there are two separate attenuation values
for 2.4 and 5 GHz. You can enter a custom attenuation value. A
custom value can be obtained by measuring signal strength on each
side of the obstruction and calculating the difference.
Measurements can be performed using TamoGraph or any WLAN analyzer,
e.g., CommView for WiFi. Reflection
is a percentage of signal
strength that is reflected by the obstruction at the 90°
angle. Color
is an arbitrary color used to
show the obstruction on the floor plan. If you prefer obstructions
to appear colorless (i.e., grayscale), you can configure the
application to grayscale them in the Visualization
Settings panel. When
you have edited obstruction properties, you can save the current
configuration for future use by clicking the Save as Preset
button at the bottom of the
dialog window.
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