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<h1>Redundant/Floating TRX</h1>

<p>This feature provides two ways to secure the BCCH-TRX operation
in a sectored BTS.</p>


<p>A redundant TRX can be taken to traffic in case of a BCCH-TRX
failure in a sectored 1+1+1 BTS. Thus a redundant TRX replaces a broken BCCH-TRX.
The FTS (Floating Transceiver Switch) is used to switch the redundant TRX
from one sector to another. This redundant TRX uses the same Abis transmission
resource as the failing unit, thus there is no need to reserve any extra capacity
for this redundant TRX.</p>


<p>A floating TRX can also be configured as a TCH TRX. In
case of a BCCH-TRX failure, this floating TRX replaces the BCCH-TRX of any
sector. A floating TRX can be switched to any sector by means of FTS. A typical
configuration would be 2+1+1 where the second TRX of the first sector is a
floating TRX. After a failure of any BCCH-TRX, the site becomes a 1+1+1 site.
The FTS reserves the place of one TRX unit thus reducing the maximum capacity.
FTS cannot be installed into Nokia FlexiTalk.</p>


<p>The support for a floating TRX exists only in the Nokia
Talk-family BTS. Note that for Nokia 2nd generation, there is a feature called
‘Cold standby redundant TRX’. Its functionality is logically the same as the
one described in the first choice for floating TRX except that the TRX cannot
be switched between sectors. Therefore each sector for which this redundancy
is required needs to be equipped with its own redundant TRX.</p>
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