Motorola Motorola PTP 250, Руководство пользователя, Страница: 62 / 236

Site planning Chapter 2 Planning considerations
phn-2182_002v000
2-4
May 2011
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 4-25 .
x
Height and location to achieve the best radio path.
x
Ability to meet the requirements specified in Grounding and lightning protection
on page 2-11 .
x
Aesthetics and planning permission issues.
x
Cable lengths; see Maximum cable lengths on page 2-5 .
x
The effect of strong winds on the installation; see Wind loading on page 2-5 .
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 components on page 4-9 .
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 4-12 .