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<title>System impact of Adaptive Multi Rate Codec (AMR)</title>
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<h1>System impact of Adaptive Multi Rate Codec (AMR)</h1>

<p>For an overview, see <a href="NED?action=retrieve&amp;identifier=dn02222016&amp;edition=5&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=nov252135321#nov252135321" onclick="sync(this);return true" shape="rect">Overview
of Adaptive Multi Rate Codec (AMR)</a>.</p>


<p><a href="NED?action=retrieve&amp;identifier=dn03297833&amp;edition=4&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_2#ned_2" onclick="sync(this);return true" shape="rect">Requirements</a></p>


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<h2>Impact on transmission</h2>

<p>In the BSC2i, there is a maximum of 512 TRXs with AMR FR
and a maximum of 256 TRXs with AMR HR. In BSC3i, there is a maximum of 660
TRXs with AMR FR and a maximum of 330 TRXs with AMR HR.</p>
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<p><a href="NED?action=retrieve&amp;identifier=dn03297833&amp;edition=4&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_6#ned_6" onclick="sync(this);return true" shape="rect">Impact on BSS performance</a></p>


<p><a href="NED?action=retrieve&amp;identifier=dn03297833&amp;edition=4&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_7#ned_7" onclick="sync(this);return true" shape="rect">User interface</a></p>


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<h2>Impact on Network Switching Subsystem (NSS)</h2>

<p>Information on AMR codec is delivered on the A interface.
AMR-supporting pool must be in use on the A interface.</p>


<p>For more information, see <em>Feature 901:
Enhanced A-interface Circuit Allocation</em> feature description in MSC
documentation.</p>
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<p><a href="NED?action=retrieve&amp;identifier=dn03297833&amp;edition=4&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_11#ned_11" onclick="sync(this);return true" shape="rect">Impact on NetAct products</a></p>


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<h2>Impact on interfaces</h2>

<p>Information on AMR codec is delivered on the A interface. AMR-supporting
pool must be in use on the A interface.</p>


<p>On the Abis interface, AMR codec information is delivered in Channel
Activation and Mode Modify messages.</p>
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<p><a href="NED?action=retrieve&amp;identifier=dn03297833&amp;edition=4&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_12#ned_12" onclick="sync(this);return true" shape="rect">Interworking with other features</a></p>


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<h2>Impact on mobile terminals</h2>

<p>AMR supporting MS is required.</p>
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