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<h2>Impact on interfaces</h2>

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<h3>Impact on radio interface</h3>

<p>Gb over IP has no impact on radio interface.</p>
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<h3>Impact on Abis interface</h3>

<p>Gb over IP has no impact on Abis interface.</p>
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<h3>Impact on A interface</h3>

<p>Gb over IP has no impact on A interface.</p>
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<h3>Impact on Gb interface</h3>

<p>For a detailed description of the signalling procedures and the related
PDUs, see <em>BSC-SGSN Interface Specification Network Service Protocol
(NS)</em> in BSC/TCSM Product Documentation Set or <em>Nokia 2G SGSN -
BSS Interface Description, Network Service Protocol (NS)</em> in Nokia 2G
SGSN Product Documentation Set.</p>


<p>The following new PDUs are introduced due to Gb over IP:</p>


<ul>
<li><p><span class="message-sem">SNS-ACK</span></p>
</li>
<li><p><span class="message-sem">SNS-ADD</span></p>
</li>
<li><p><span class="message-sem">SNS-CHANGEWEIGHT</span></p>
</li>
<li><p><span class="message-sem">SNS-CONFIG</span></p>
</li>
<li><p><span class="message-sem">SNS-CONFIG-ACK</span></p>
</li>
<li><p><span class="message-sem">SNS-DELETE</span></p>
</li>
<li><p><span class="message-sem">SNS-SIZE</span></p>
</li>
<li><p><span class="message-sem">SNS-SIZE-ACK</span></p>
</li>
</ul>


<p>The following existing PDUs are modified due to Gb over IP:</p>


<ul>
<li><p><span class="message-sem">NS-UNITDATA</span></p>
</li>
<li><p><span class="message-sem">NS-STATUS</span></p>
</li>
</ul>


<p>The following existing PDUs are used to handle Gb over IP:</p>


<ul>
<li><p><span class="message-sem">NS-ALIVE</span></p>
</li>
<li><p><span class="message-sem">NS-ALIVE-ACK</span></p>
</li>
</ul>
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