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<h1>Redundant Abis Trunk for E1 interface</h1>

<p>If a failure or a problem in the transmission connection
occurs between BSC and BTS sites, an alternative transmission route (redundancy)
is desirable.</p>


<p>Two alternative strategies are available for redundancy.
The first is a duplicated point-to-point type connection, and the second is
a redundant multi-drop loop connection. These two alternatives provide solutions
for different transmission needs: either the traditional redundant point-to-point
configuration or the economical multidrop loop configuration.</p>


<p>This feature is implemented by using the standard G.703
2 Mbit/s PCM frame structure.</p>


<p>For more details, see BSS Transmission Configuration Guide.</p>
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