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<h1>BCCH Supervision</h1>

<p>The continuous transmission of a BCCH is essential for
services. Therefore, there has to be a means to supervise that transmission
really takes place.</p>


<p>In Nokia 2nd generation of BTSs the RTC (Remote Tune Combiner)
can detect a situation when there is no power input to a cavity. After downloading,
when the BTS-OMU informs the BSC about the state change of a BCCH-TRX, the
BTS-OMU starts a timer. Now, if this timer expires before there is a cancellation
to the 'no carrier' -alarm from the RTC, an alarm 'NO BCCH TRANSMISSION' is
sent to the BSC.</p>


<p>In Nokia Talk-family, similar logic exists, but here the
supervision is available also with wideband combiners.</p>
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