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Chapter 3: System planning
Site grounding system
Confirm that the site has a correctly installed grounding system on a common ground ring with
access points for grounding PTP 650 equipment.
If the outdoor equipment is to be installed on the roof of a high building
the following additional requirements are met:
•
A grounding conductor is installed around the roof perimeter to form the main roof perimeter
lightning protection ring.
•
Air terminals are installed along the length of the main roof perimeter lightning protection
ring, typically every 6.1m (20ft).
•
The main roof perimeter lightning protection ring contains at least two down conductors
connected to the grounding electrode system. The down conductors should be physically
separated from one another, as far as practical.
ODU and external antenna location
Find a location for the ODU (and external antenna for connectorized units) that meets the following
requirements:
•
The equipment is high enough to achieve the best radio path.
•
People can be kept a safe distance away from the equipment when it is radiating. The safe
separation distances are defined in
page 4-25.
•
The equipment is lower than the top of the supporting structure (tower, mast or building) or its
lightning air terminal.
•
If the ODU is connectorized, select a mounting position that gives it maximum protection from
the elements, but still allows easy access for connecting and weatherproofing the cables. To
minimize cable losses, select a position where the antenna cable lengths can be minimized. If
diverse or two external antennas are being deployed, it is not necessary to mount the ODU at
the midpoint of the antennas.
Calculated distances and power compliance margins
Page
3-10
Site planning
(Figure
25), confirm that
on
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