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<h2>Nokia UltraSite BTS and EGPRS transmission planning</h2>

<p>A single UltraSite BTS cabinet supports up to 12 GSM/EDGE
TRXs for frequency bands 900, 1800, and 1900. UltraSite supports the same
transmission cards and features as MetroHub (MetroHub does not support FC
E1/T1), except that UltraSite has four slots for transmission cards instead
of five.</p>


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<img alt="urn:mars:dn02263377:2:en:global:cgm_fixed:data:data" border="0" src="NED?action=retrieve&amp;identifier=dn02263377&amp;edition=2&amp;language=en&amp;coverage=global&amp;encoding=gif&amp;component=data&amp;item=data" /><p class="figure-caption">Figure: UltraSite BTS</p>
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<h3>D-bus
structure of the UltraSite (M)</h3>

<p>The first EDGE release of UltraSite supports 3 * D1-buses
(D11, D12, D13). Consequently, the maximum Abis capacity of a single BTS is
3 * 2 M PCM. New timeslot allocations are required to support the correct
Abis structure and correct cross-connections between the Abis and D-buses.</p>


<p>It must be possible to reserve 3 x 2 M capacity at the
beginning from the Abis and D-buses per single BTS even if we have only for
example 1+1+1 configuration/BTS selected. This is required to support a smooth
capacity extension in the future.</p>


<p>UltraSite supports a flexible D-bus structure. Although
it is possible create almost all kinds of structures for D-buses, this is
not recommended because the timeslot allocation structure should be as clear
as possible. It is recommended to use “default” D-bus structures as much as
possible. Figure <em>Default DBUS structure of the EDGE UltraSite</em>
shows an example of a default configuration. In this example the timeslot
allocations for D11 are used for fixed types of signal, mainly TCHs, TRXsig,
and BCFsig.  The D12 and D13 are for EDGE planning of the dynamic Abis DAP
pool.</p>


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<dl class="note-notification">
<dt class="note-caption">Note</dt>
<dd>Note that it is allowed to have the DAP pool on the D1,
D2, D3 buses and to have the fixed Abis timeslots for a set of TRX slots on
different D-buses.</dd>
</dl>


<p>For more information, see <em>Nokia UltraSite
EDGE BTS Product Documentation</em>.</p>


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