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<h1>Alarm if Number of Usable A-If Circuits Below Limit</h1>

<p>A interface circuit availability supervision measures the
number of unavailable A interface circuits. If the number of unavailable circuits
exceeds the predefined limit and stays above that limit for a certain period
of time, an alarm will be given to the operator.</p>


<p>A interface circuits are either available in WO-EX state
or unavailable in all other states. The only exception is NU-US state, which
is considered neither available nor unavailable because this is not a normal
operational state for circuits.</p>


<p>The following factors can bring about the BL (blocked)
state:</p>


<ul>
<li><p>The user has blocked the circuit</p>
</li>
<li><p>The user has blocked the exchange terminal</p>
</li>
<li><p>The system has blocked the circuits
due to a 2Mbit failure</p>
</li>
<li><p>The system has blocked the circuit
due to transcoder supervision (Q1) alarm.</p>
</li>
</ul>


<p>This feature is controlled by two parameters. The first
parameter is the alarm limit given as a percentage of unavailable A interface
circuits. The given value is common for all A interface circuits and does
not depend on different circuit groups defined in the A interface. The second
parameter is alarm delay. That is the time during which the alarm conditions
must be fulfilled before the alarm is set. To turn off the supervision, change
the first parameter value to 100%.</p>
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