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<h1>Ater Trunk Transmission Allocation</h1>

<p>The most favourable position for the Transcoder is on the
MSC site because 16 kbit/s subchannels are used on all transmission links
between the BTS and MSC site and submultiplexing can be used to save transmission
links.</p>


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<h2>TCSM1</h2>

<p>First generation transcoder/submultiplexer </p>


<p>The maximum number of full rate channels is 90.</p>


<p>For more details, see TCSM Equipment Description and BSS
Transmission Configuration Guide.</p>
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<h2>TCSM2E</h2>

<p>Second generation transcoder/submultiplexer</p>


<p>Together with new half rate-related routing and switching
in the BSC and the TCSM2 it is possible to optimise utilisation of Ater PCM
lines.</p>


<p>In a full rate-only configuration, the maximum amount of
Ater channels is 120 with GSWB.</p>


<p>In a half rate-only configuration, the maximum number of
Ater channels is 210 with GSWB.</p>


<p>It is also possible to have mixed configurations with the
accuracy of one A interface PCM, for example, 2 full rate A interface PCMs
and 3 half rate A interfaces if PCMs carried over one Ater PCM link, totalling
150 traffic channels in this example with the GSWB.</p>


<p>For more details, see TCSM2 Product Description and BSS
Transmission Configuration Guide.</p>
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