Cambium Networks PTP 250, User Manual

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Site planning Chapter 2: Planning considerations
2-6 phn-2510_002v000 (Mar 2012)
Site planning
This section describes factors to be taken into account when choosing sites for the ODU
and PoE power supply.
ODU site selection
When selecting a site for the ODU, consider the following factors:
x
Height and location to ensure that people are kept away from the antenna; see
Calculated distances and power compliance margins on page 4-10 .
x
Height and location to achieve the best radio path.
x
Ability to meet the requirements specified in Grounding and lightning protection on
page 2-15 .
x
Aesthetics and planning permission issues.
x
Cable lengths; see Maximum cable lengths on page 2-7 .
x
The effect of strong winds on the installation; see Wind loading on page 2-7 .
Power supply selection
Select a suitable power supply unit for the PTP 250. The only supported units are the PoE
power supply (included in PTP 250 kits) or the PTP 300/500/600 Series PIDU. The PoE
power supply is suitable for the majority of installations, but the PIDU is required in the
following situations:
x
When a -48 V DC power supply is required, either as the primary supply or as a backup
to the AC mains.
x
When an extended operating temperature range is required for the mains powering
system, for example when the indoor equipment is in a building without temperature
control or air conditioning.
For PIDU ordering information, see Alternative and additional components on page 2-34 .
The power supply unit must be installed in an indoor location with no possibility of
condensation, with an ambient temperature within the specified operating range of the
product; see
Power supply unit specifications on page 4-3 .