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<h1>Nokia Talk-family BTS Synchronisation</h1>

<p>This feature provides Time Slot and Frame Number synchronisation
for different Nokia Talk Family BTSs located at the same site. The feature
will be implemented by installing new BCF-cards. The BCF-card is a unit in
the BTS, which is responsible for O&amp;M, functions of the BTS, and timing
of the transceiver units (TRXs). The new BCF card can be set to be a master
or a slave by a switch, and it includes input and output for clock signals.</p>


<p>When several base stations are synchronised, one BTS is
set to work as a master, and the remaining ones are set to work as slaves.
The master will synchronise its internal clock to the incoming PCM transmission
line and deliver clock signals and Frame Number via a clock cable to the slave
BTSs (see the picture below).</p>


<p>When BTSs are synchronised, hopping sequences run in a
fixed relationship, and synchronised handovers between different BTSs are
possible.</p>


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<p>This initial solution is hardware only and needs no software
support from the BSC or BTS. The synchronisation will be supported for Nokia
IntraTalk and CityTalk BTSs.</p>
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