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<div class="div">
<h2>Nokia MetroSite BTS</h2>

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<h3>Continuous
monitoring </h3>

<p>In the Nokia MetroSite BTS, part of the monitoring is made
by HW; like the monitoring of a RF-synthesizer. The following items are monitored
continuously:</p>


<ul>
<li><p>Internal buses of the BTS: Q1Int, D-bus,
F-bus, I2C bus, cross connection bus;</p>
</li>
<li><p>Transmission units and interfaces;</p>
</li>
<li><p>RF parts: synthesizers, output power,
power control, reflected power;</p>
</li>
<li><p>Digital parts: processors, ASICs, interfaces;</p>
</li>
<li><p>Temperature and heating or cooling
system of the BTS;</p>
</li>
<li><p>Power supply voltages;</p>
</li>
<li><p>Reference Oven Oscillator.</p>
</li>
</ul>
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<h3>Mains
breakdown</h3>

<p>The mains breakdown alarm 7620 POWER LOST INDICATION can
be sent to the Abis with the help of capacitors in AC power supply. In case
of a short breakdown that does not affect the BTS operation, the alarm is
cancelled by the BTS. A typical voltage drop that lasts less than 20ms will
not cause any detectable harm to the operation.</p>


<p>If any of the supervision monitoring mentioned above should
fail, alarm handling verifies the alarms and makes the recovery whenever possible.
For example, if leaves or paper gets inside the fan, the Nokia MetroSite BTS
is enable to detect that there is something preventing the fan to operate
normally. So it first turns the fan off and then on and keeps it running at
the full speed for a while. If the problem is away, the operation can continue
normally. But if the fan is still not working properly, an alarm is raised,
and the fan is stopped.</p>
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