Determine Range & Clearance
Examples
3-16
Avaya Outdoor Antenna Installation Guide
Figure 3-4
Calculating the Point-to-Multipoint Range
For this type of outdoor antenna installation you will need to determine the range
for each link individually, i.e. the range from the building
c
to building
a
, and from
the building
c
to building
b
.
NOTE:
In this example we will only demonstrate the calculation for the link
between building
a
and
c
. However as different clearance factors may
apply for each of these links, you are advised to calculate the actual
range for each link individually when designing a “real” outdoor antenna
link.
For the purpose of this example we presume that:
■
The antenna installation will be installed in a dense urban area, where the
distance between building
a
and building
c
is 0.5 Km.(0.3 mi.).
■
The actual clearance is 3m. (9.9ft.), being the height of the antennas on the
mast
2
.
Now let’s calculate the probable range for this example using the introduced
formula:
Range = Maximum Range x Cable Factor x Clearance Factor
2
According to the information about dense urban areas described in “Determine the Clearance
Factor” on page 3-8, we use the height of the antennas above the roof-tops of both buildings to
determine the level of actual clearance.