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<h1>Abis Trunk Transmission Allocation</h1>

<p>Up to four FR/EFR speech channels (or up to eight HR speech
channels) are multiplexed on a single PCM timeslot. Point-to-point star, multidrop
chain or remote star transmission connections could be created between BSC
and BTS sites. By this flexibility all kind of transmission needs can be satisfied:
traditional star configuration, economical multidrop chains, and reliable
multidrop loops are all possible.</p>


<p>Up to 12 TRXs are supported on a single 2 Mbit/s PCM line.
Accepting that one or two speech channels are lost, up to 15 TRXs could be
supported.</p>


<p>This feature is implemented 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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