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<h1>Cell Broadcast Interface to Cell Broadcast Centre</h1>

<p>The Cell Broadcast Centre Interface provides an interconnection
between the BSC and Cell Broadcast Centre CBC.</p>


<p>The feature provides the service defined for the CBC-BSC
interface (see GSM 03.41) and permits an open interconnection. For operators
it offers centralised means to operate the Cell Broadcast. As a value-added
property the Cell Broadcast Interface provides better tools for requesting
and reporting of the CBCH related loading and especially error conditions.
Also the CBC can request the amount of transmission of each CB message.</p>


<p>The protocol used between the BSC and the CBC is the XTI-interface.
It uses the services of the OSI Transport Layer.</p>


<p>A CBC Application can be developed using XTI Application
Programming Interface (X/Open Transport Interface) to interconnect the application
to the OSI Transport Layer.</p>


<p>In the lower layers of OSI the possibilities for the CBC
interface are</p>


<ul>
<li><p>Connection through the PSPDN using
the AC25-S interface plug-in unit,</p>
</li>
<li><p>Connection through PCM/TSL or leased
line using AS7-U interface plug-in unit. FE or a router is needed for routing
CBC related data and</p>
</li>
<li><p>Connection through LAN using COCEN
interface plug-in unit  (BSC, BSC2E/2A)</p>
</li>
<li><p>Connection through LAN (BSC2i, BSC3i).</p>
</li>
</ul>


<p>Connection unit in the BSC is OMU. CBC connection shares
the same transport media as Q3, only a new logical connection is introduced.
If a non-redundant Q3 connection is used, more transmit capacity can be gained
by using a dedicated plug-in unit for CBC.</p>
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