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<h3>BSC</h3>

<p>EGPRS can be implemented in the BSC with S9 level GPRS
PCUs. However, a new configuration has been created for BSC2E/A and BSC2i,
with the possibility to add a second PCU (PCU-S or PCU-T plug-in unit) per
BCSU unit (8+1) to further increase the packet processing capacity. The implementation
of a second PCU also requires a GSWB extension from 192 to 256 PCMs. Correspondingly
the number of ETs can be extended from 112 to 144 in BSC2s.</p>


<p>BSC S10.5 network element HW supports all existing functionalities
and their implementation principles.</p>


<p>The packet handling capacity and connectivity per each
logical PCU is 64 BTSs, 128 TRXs, and 256 traffic channels (16 kbit/s) for
GPRS/EDGE use.</p>


<p><em>BSC3i</em>:</p>


<ul>
<li><p>Cabinet and basic units, with one or
two PCU-Bs (redundant PCU units)</p>
</li>
<li><p>PCU Capacity steps (including HW and
functionality) one or two per BCSU</p>
</li>
</ul>


<p>BSC3i can have two PCU-B plug-in units in each BCSU that
each contain two logical PCUs. So in essence, BSC3i has four logical PCUs
per BCSU.</p>


<p>With full configuration (12 physical PCU units, 24 logical
PCU units), the maximum capacity of a BSC3i for GPRS/EDGE use is 256 x 24
= 6144 traffic channels (16kbit/s).</p>


<p><em>Other BSCs than BSC3i</em>:</p>


<ul>
<li><p>BCSU (GPRS) 64 TRX, or BCSU (GPRS/EDGE)
64 TRX</p>
</li>
<li><p>One or two GPRS/EDGE GSM BSS Functionality
per PCU (31*64kbps), per BCSU</p>
</li>
<li><p>PCUs, Packet Control Units HW to BSCUs
(PCU-S or PCU-T PIUs and DMCT2-S terminator if not already installed). </p>
</li>
<li><p>PCU Cables for BSC (for internal PCU
cabling, if not already installed).</p>
</li>
</ul>


<p><em>Additional or optional hardware for
BSC3i</em>:</p>


<ul>
<li><p>two PCU-B plug-in units</p>
</li>
</ul>


<p><em>Additional or optional hardware for
EGPRS for other BSCs than BSC3i</em>:</p>


<ul>
<li><p>PCU-S or PCU-T PIU and DMCT2-S terminator
if not already installed.</p>
</li>
</ul>


<ul>
<li><p><em>Fourth SW64B plug-in
unit and SWBUS4 connector to GSWB (optional)</em></p>


<p>The PCU requires the GSWB extension (2 per BSC) for multiplexing
the 256 Abis sub-time-slots into it. The second PCU card for the BSC unit
requires an extension of the GSWB with a fourth SW64B plug-in unit.</p>
</li>
<li><p><em>ET5C cartridge (optional)</em></p>


<p>Additional ET5C cartridges are optional as they are not
needed for GPRS. However, they are needed to increase the PCMs from 80 to
112. In the S8 optional upgrade to High Capacity BSC they have been added.</p>
</li>
<li><p><em>AS7-X, Adapter for
CCS7 signalling</em> (replaces AS7-V and AS7-VA in new deliveries)</p>


<p>The AS7-X is a multichannel signalling link terminal for
data or signalling using the HDLC format. The capacity of the AS7-X is the
same as the AS7-V and AS7-VA. The memory architecture in AS7-X pre-processor
units is based on the SRAM.</p>
</li>
</ul>
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