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6 Site Planning
6.1 Site Selection Criteria
The following are guidelines for selecting the installation location of the ODU and PIDU Plus for
a PTP 500 Series Bridge.
6.1.1 ODU Site Selection
When selecting a site for the ODU the following should be taken into consideration:
It is not possible for people to stand or walk inadvertently in front of the antenna
Height and location to achieve the best radio path
Height in relation to other objects with regard to lightning strikes
Aesthetics and planning permission issues
Distance from the ODU and connected Network equipment (Maximum cable run from the ODU
to the connected equipment is 100m [330 ft])
Distance from the PIDU Plus to the ODU (Maximum cable run from the PIDU Plus to the
ODU is 300m [990 ft] when using the Fiber interface)
6.1.2 PTP 500 Series Bridge PIDU Plus Site Selection
When selecting a site for the PIDU Plus the following should be taken into consideration:
Availability of a mains electricity supply
Accessibility for viewing status indicators and pressing Recovery switch.
6.1.3 Path Loss Considerations
The path loss is the amount of attenuation the radio signal undergoes between the two ends of the
link. The path loss is the sum of the attenuation of the path if there were no obstacles in the way
(Free Space Path Loss), the attenuation caused by obstacles (Excess Path Loss) and a margin to
allow for possible fading of the radio signal (Fade Margin).
Where
= Free Space Path Loss
free_space
= Excess Path Loss
excess
= Fade Margin Required dB
fade
= Seasonal Fading
seasonal
= Equipment Capability dB
capability
Site Planning
+
+
excess
free_space
dB
dB
dB
+
fade
seasonal
capability
42
(3)
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