User guide

March 2005 Designing Your Canopy Network
Through Software Release 6.1
Page 110 of 425 Issue 1
Canopy System User Guide
LEGEND
b Angle of elevation.
B Vertical difference in elevation.
A Horizontal distance between modules.
Figure 40: Variables for calculating angle of elevation (and depression)
Calculating the Angle of Elevation
To use metric units to find the angle of elevation, use the following formula:
tan b =
B
1000A
where
B is expressed in meters
A is expressed in kilometers.
To use English standard units to find the angle of elevation, use the following formula:
tan b =
B
5280A
where
B is expressed in feet
A is expressed in miles.
The angle of depression from the higher module is identical to the angle of elevation from
the lower module.
12.5 COLLOCATING CANOPY MODULES
Canopy APs and a BHM can be collocated at the same site only if the following rules are
observed:
◦ APs are on a different frequency band range from that of the BHM or one of the
following conditions applies:
− They are vertically separated on a structure by at least 100 feet (30 m).
− They are vertically separated on a structure by less distance, but either
◦ an RF shield isolates the APs from the BHM.
◦ the uplink and downlink data parameters and control channels match.
◦ All collocated modules are synchronized by a CMM.