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<h2>Creation, modification and deletion of the Dynamic Abis pool</h2>

<p>During the creation, the user must identify the controlling
PCU unit. The pool is created as a continuous block of 64k timeslots. The
BSC reserves those circuits so that they cannot be used for other purposes
without deleting the pool first and making the necessary routings. The BSC
checks that the given PCM is connected to the Abis, and the circuits to be
reserved are free.</p>


<p>The O&amp;M user can modify the DAP by adding timeslots
to the beginning or to the end of the pool by deleting timeslots from the
beginning or from the end of the pool and changing the PCU unit controlling
the EGPRS timeslots. The BSC takes care of the necessary modifications and
updating. If the PCU unit is changed, no TRXs can be attached to that pool
with GPRS enabled on. The BSC also updates the new pool information to the
BTSs that use this pool.</p>


<p>The user deletes the DAP by checking the pool id. The BSC
checks that there are no TRXs attached to the pool with the GPRS enabled on.
The BSC deletes the pool and releases the circuits from the pool and updates
the BTSs that used this pool. </p>


<p>If the releasing of the pool circuits fails, the pool is
seen as deleted, and the user has to release/clean the pool circuits manually.</p>
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