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<h1>BTS External Alarms and Controls</h1>

<p>A BTS site usually contains some additional equipment (battery
back-up systems, rectifiers, radio links, cooling systems, etc.) that is vital
to the site operation and therefore need some kind of supervision and alarm
monitoring support. Similar needs exist for controlling some site equipment.</p>


<p>The BTS cabinets support external digital inputs and outputs
for controlling some external devices and for collecting alarm information.
The actual number of lines available depends on the cabinet type in use. The
state of outputs can be controlled from the BSC-MMI, and they are also initialised
to the desired state always after a site reset.</p>


<p>The user can define the following characteristics for all
external inputs into the hardware database:</p>


<ul>
<li><p>A descriptive text string, for example,
"SITE DOOR"</p>
</li>
<li><p>An active state definition, that is,
polarity. This defines whether an alarm is raised</p>
</li>
<li><p>When the input is grounded or disconnected
from ground potential</p>
</li>
<li><p>Fatality of the alarm.</p>
</li>
</ul>


<p>The state of inputs is reported as alarms to the BSC (and
to the NetAct). Every time a change in the state of any of the inputs takes
place, the identity, the attached text, and the new state of that input is
reported to the BSC (and to the NetAct) as an alarm.</p>
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