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<h1>Interim Intelligent Shutdown Solution for Nokia UltraSite
(IIS)</h1>

<p>To maintain and continually improve the requirements for
site back-up support systems, Nokia has developed an Interim Intelligent Shutdown
(IIS) solution for the UltraSite EDGE BTS based on NetAct and partial load
disconnect (PLD) unit.</p>


<p>The IIS is an optional feature that forms part of the UltraSite
solution portfolio and provides key benefits prior to the release of BSS11,
in which the full IS support for UltraSite EDGE BTS is introduced.  It is
designed to provide an additional level of power shutdown functionality in
the event of loss of AC mains supply, thus reducing the demand on the site
support system back-up capacity, whilst maintaining essential BTS functions.</p>


<p>When an AC mains failure alarm is detected at the BSC,
the IIS script is triggered.  The IIS script performs the forced handover
(FHO) of calls from non-BCCH (traffic) TRX's to reduce the power consumption
to the lowest possible value. Once the calls are handed over, the non-BCCH
TRX's are set to a blocked state, and the BCCH TRX's are maintained along
with the BTS common units (thus maintaining the transmission chain). In multi-cabinet
configurations, cabinets containing traffic TRXs can be completely disconnected
from DC power by using a PLD unit - this is done after the FHO's have been
completed.  After AC mains recovery, the script re-activates the blocked TRX's
into normal service mode.</p>


<p>Nokia IIS solution is designed to be used with all UltraSite
EDGE or UltraSite EDGE / WCDMA co-siting configurations.</p>
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