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<h1>Redundant BTS Station Unit</h1>

<p>As the operation of the common units of a BTS site is critical
for the operation of the whole BTS and service, maximum reliability must be
ensured.</p>


<p>Some of the units common for the whole site can be duplicated
for maximum reliability. The unit redundancy is available for the Master Clock
unit (MCLx), Frequency Hopping Unit (FQHU) and for the Station Unit Power
Supply (SUPx). Any combination of these redundancy options is allowed, combinations
are not dependent on each other in any way. Note that if diversity is used,
the second FQHU is not used for redundancy, instead it is required for the
diversity receiver signal path.</p>
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