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One should be aware that the worst hot spot is usually 1 to 3 antenna diameter from the antenna aperture
on the antenna symmetry axis. Another rule of thumb is that the maximum intensity is larger for a smaller
antenna. The most dangerous "antenna" is an open waveguide (i.e. very small radiating aperture). The
safety zone for a large antenna can be very long but the maximum intensity much lower than in case of a
small antenna.
INDOOR UNIT INSTALLATION
The indoor unit is installed in a 19-inch or ETSI rack. The delivery includes brackets for both racks. There is
an AMP-power connector included in the box but it is recommended to use a factory-made power cable.
The indoor unit is cabled as usual (grounding, power cable, Ethernet, E1, SDH, management). It is not
necessary to connect all E1 channels to the external connector and cross-connection frame: internal cross-
connection can be used for E1 signals between modems. Same applies for Ethernet.
VENTILATION
iPasolink does not necessarily require any free space above and below the IDU due to cooling, but there has
to be enough free space on each side of the IDU inside the rack, because the air intake and fan exhaust is
on the side.
Free space may be required when there is some other equipment requiring free space for cooling. Also
cabling is easier when there is free space between units. Labelling of the modems is easier on the top side
of the IDU. Therefore it is recommended to leave 1U of free space above and below each IDU.
ENVIRONMENTAL REQUIREMENTS
According to the specifications, the indoor unit operates within -5 to +50 degrees Celsius and the maximum
non-condensing relative humidity is 90 per cent.
The limits indicate the allowed short-term temperatures, e.g. during cooling system failure. Long-term
average temperatures should be kept as low as possible, however, because a high average temperature will
decrease the MTBF of any electronic equipment. The number of failures will typically double when the
average temperature increases by 10 degrees.
The indoor units should not be installed close to the ceiling: the distance should be at least one
metre.
Hot air currents should be avoided (eg. the exhaust of a base station cabinet fan).
The cable entry points have to be sealed properly to prevent rain water entering the shelter.
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