Chapter 3: System planning
Site planning
Page 3-13
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
•
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.
ODU ambient temperature limits
Select a location where the ODU can operate within safe ambient temperature limits.
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.
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.
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.
