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<h2>Nokia MetroSite Base Station</h2>

<p>The Nokia MetroSite BTS supervises its temperature continuously
by using several sensors located in active units (in all TRXs, fan, transmission
unit). The Nokia MetroSite BTS has cooling fans and heaters to provide temperature-controlling
facility. Temperature control can be divided into normal and abnormal cases.
The power switch-off capabilities are for abnormally hot case.</p>


<p>In a normal case, the MetroSite BTS SW takes care of heating
and cooling in order to provide as stable operation conditions as possible.
Heating and cooling is controlled gradually to ensure minimised temperature
gradients and a low noise level.</p>


<p>If the Nokia MetroSite BTS starts up in an extremely cold
environment, the units are heated to a normal temperature region, and power
supply output is inhibited.</p>


<p>If the temperature of a slave TRX rises too high, it gives
a temperature alarm. The master transceiver shuts down an appropriate slave
transceiver.</p>


<p>In addition, power supply switches the power off for all
units if the unit in question is overheated abnormally. The power supply switches
the power on after the unit's temperature has decreased. </p>
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