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<h2>Installation and commissioning</h2>

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<h3>BTSs</h3>

<p>If there are several BCFs at the site, make sure that site synchronisation
has been implemented by connecting the BCFs with clock cables.</p>


<p>Also, make sure that the BTSs have been configured to use the external
frame clock signal supplied by the LMU as described under <em>BTS parameters</em>
in <a href="NED?action=retrieve&amp;identifier=dn04122239&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=feb451332382#feb451332382" onclick="sync(this);return true" shape="rect">System impact of BSS Synchronisation</a>.</p>


<p>If there are different types of slave BCFs in the synchronisation chain,
first add the Talk-family BTSs and then MetroSite BTS or UltraSite
BTSs. Only one MetroSite BTS or 'Shared BCF MetroSite chain' is allowed in
a single clock chain.</p>


<p>The maximum number of clock-chained BCFs is 9. For more details on chaining
and related clock cable connections, see Nokia BTS documentation.</p>
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<h3>LMU</h3>

<p>An LMU with a GPS antenna is required at every BTS site. The LMU is
installed according to the BTS-type-specific instructions and commissioned
with LMU Manager.</p>


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<dt class="note-caption">Note</dt>
<dd><p>When installing the LMU, special attention should be given to the GPS
antenna positioning so that there is clear visibility to several GPS satellites.</p>



<p>The default value (OFF) must be used for the <span class="parameter-sem">Automatic
clock output</span> parameter.</p>
</dd>
</dl>


<p>For detailed instructions, see LMU documentation.</p>
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