Cambium Networks PMP 450 Series, Installation Manual

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Chapter 3: System planning 141
ODU and ext er nal ant enna locat ion
Find a location for the ODU (and external antenna for connectorized units) that meets the following
requirements:
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The equipment is high enough to achieve the best radio path.
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People can be kept a safe distance away from the equipment when it is radiating. The safe
separation distances are defined in Calculated distances and power compliance margins in Legal
and Open Source Guide.
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The equipment is lower than the top of the supporting structure (tower, mast or building) or its
lightning air terminal.
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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.
ODU am b ient t em p er at ur e lim it s
Select a location where the ODU can operate within safe ambient temperature limits. The following points
need to be considered while selecting a location for the ODU:
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The ODU must be mounted in a Restricted Access Location (as defined in EN 60950- 1) if the
operating ambient temperature may exceed 40°C, including solar radiation.
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If the ambient temperature never exceeds 40°C, the temperature of the external metal case parts of
the ODU will not exceed the touch temperature limit of 70°C.
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If the ambient temperature never exceeds 60°C, the temperature of the external metal case parts of
the ODU will not exceed the touch temperature limit of 90°C.
Note
A restricted access location is defined (in EN 60950-1) as one where access may
only be gained by use of a tool or lock and key, or other means of security, and
access is controlled by the authority responsible for the location. Access must
only be gained by persons who have been instructed about the reasons for the
restrictions applied to the location and about any precautions that must be
taken. Examples of permissible restricted access locations are a lockable
equipment room or a lockable cabinet.
ODU w ind load ing
Ensure that the ODU and the structure on which it is mounted are capable of withstanding the prevalent
wind speeds at a proposed 450 Platform site. Wind speed statistics are available from national
meteorological offices.
The ODU and its mounting bracket are capable of withstanding wind speeds of:
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Up to 200 mph (322 kph) for PMP 450m Series – AP 5 GHz
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Up to 124 mph (200 kph) for PMP 450m Series – AP 3 GHz
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Up to 124 mph (Integrated) for PMP/PTP 450i – all models 3 GHz and 5 GHz