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<h1>Chaining of Nokia MetroSite Base Station</h1>

<p>Nokia MetroSite GSM/EDGE base stations can be chained in
order to build larger configurations for micro cellular environments and still
have an easy installation and O&amp;M functions. The chaining is done by synchronising
a frame clock between base stations and extending internal D-bus. One transmission
unit is saved for each extension cabinet. O&amp;M functionality is centralised
to the master cabinet. Only one extension cable between cabinets is needed.
The maximum number of combined MetroSite base stations is three, and the total
length of bus cable is limited to five meter.</p>


<p>If a slave base station looses the chaining interface,
the TRX Faulty alarm is activated for each TRX in it. The chaining is arranged
in such a way that centremost cabinet can be un-powered without any problem
in case of three cabinet configurations.</p>
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