Chapter 3: System planning
Site planning
Page 3-24
Table 22 ODU wind loading (pounds force )
Type of ODU
Max surface
area (square
feet)
Wind speed (miles per hour)
140
155
170
185
200
Integrated (23 dBi)
1.40
69 lb
85 lb
103 lb
123 lb
145 lb
Connectorized
0.55
38 lb
47 lb
57 lb
67 lb
79 lb
If an external antenna is installed, add the wind loading of the antenna to that of the ODU. The
antenna manufacturer should be able to quote wind loading.
PSU AC power supply
Always use an appropriately rated and approved AC supply cord-set in accordance with the
regulations of the country of use.
PSU location
Find a location for the PSU that meets the following requirements:
•
The AC Power Injector can be mounted on a flat surface.
•
The PSU is kept dry, with no possibility of condensation, flooding or rising damp.
•
The PSU is located in an environment where it is not likely to exceed its operational
temperature rating, allowing for natural convection cooling.
•
The PSU can be connected to the ODU drop cable and network terminating equipment.
•
The PSU can be connected to a compatible power supply.
Drop cable grounding points
To estimate how many grounding kits are required for each drop cable, refer to the site
installation diagrams (
Figure 18 , Figure 19
and
Figure 20
) and use the following criteria:
•
The drop cable shield must be grounded near the ODU at the first point of contact between
the drop cable and the mast, tower or building.
•
The drop cable shield must be grounded at the building entry point.
For mast or tower installations (
Figure 18
), use the following additional criteria:
•
The drop cable shield must be grounded at the bottom of the tower, near the vertical to
horizontal transition point. This ground cable must be bonded to the tower or tower ground
bus bar (TGB), if installed.
•
If the tower is greater than 61 m (200 ft
)
in height, the drop cable shield must be grounded
at the tower midpoint, and at additional points as necessary to reduce the distance
between ground cables to 61 m (200 ft) or less.
•
In high lightning-prone geographical areas, the drop cable shield must be grounded at
spacing between 15 to 22 m (50 to 75 ft
)
. This is especially important on towers taller than
45 m (150 ft).
For roof installations (
Figure 20
), use the following additional criteria:
