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<div class="div">
<h1>GSW1KB Support</h1>

<p>GSW1KB is an optional higher capacity group switch in BSC.
It can be used to replace the GSWB unit in the BSC3i product variant. GSW1KB
expands the number of real PCMs to 1024 from 256, which is the capacity of
GSWB. Correspondingly, the new allocation of virtual PCMs is changed so that
in GSW1KB, there is a space reservation for eight virtual PCMs
per each real PCM range without any restrictions, whereas in GSWB, two real
PCM ranges can not have any virtual PCMs.</p>


<p>GSW1KB is composed of one to eight SW128B plug-in units,
which replace the SW64B plug-in units of GSWB. The capacity of one SW128B
is 128 pieces of 2 Mbit/s PCM circuits.</p>


<p>The following table shows how the number of PCMs increases
with the new GSW1KB unit in BSC3i.</p>


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<p>Table: Amount of the real and virtual PCMs in BSC3i</p>


<table border="1">
<thead>
<tr align="left" char="" charoff="50" valign="bottom">
<th colspan="1" rowspan="1" valign="top"><p>GSWB</p>
</th>
<th colspan="1" rowspan="1" valign="top"><p>GSW1KB</p>
</th>
</tr>
</thead>
<tbody>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>256 records for real PCMs</p>
</td>
<td colspan="1" rowspan="1"><p>1024 records for real PCMs</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>1408 records for virtual PCMs</p>
</td>
<td colspan="1" rowspan="1"><p>8192 records for virtual PCMs</p>


<p>(8 x real PCM records)</p>
</td>
</tr>
</tbody>
</table>
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<p>The new ET4 exchange termination plug-in unit (ET4E, ET4E-C
and ET4A) provides the 8Mbit/s interface required by GSW1KB. The existing
ET2s function with GSW1KB as well.</p>


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<h2>Implementation</h2>

<p>GSW1KB is implemented by replacing the SW64B plug-in units
with the new SW128B units and by upgrading the operating software of the BSC
to S11.5 release.</p>


<p>GSW1KB is implemented only in BSC3i product variants. Note
however, that GSW1KB Support is an operating software in S11.5 SW release
for all BSC product variants. </p>
</div>


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<h2>Interworking
with other features</h2>

<p>GSW1KB increases the memory consumption in the following
BSC units: MCMU, BCSU and OMU.</p>
</div>


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<h2>Related
topics</h2>

<p>For more information on GSW1KB, see <em>GSW1KB</em>
in BSC/TCSM documentation.</p>
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