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<h1 class="topictitle1">Communications requirements for DDM in an APPC network</h1>
<div><p>Each <span class="keyword">iSeries™ server</span> in
a DDM network that is not using <span class="keyword">OptiConnect</span> must
have these communications requirements. </p>
<div class="section"><ul><li>The APPC/APPN support or the <span class="keyword">iSeries Access Family</span> licensed
program installed and configured on the server. </li>
<li>At least one Systems Network Architecture (SNA) communications line connection
that uses synchronous data link communications (SDLC), token-ring network,
Ethernet, or X.25 protocol.</li>
</ul>
</div>
<div class="section"><p>The number of sessions that can be used for DDM conversations
is not limited by DDM. The maximum is determined in the same manner as for
any other APPC-related communications. For parallel sessions, the session
maximum is specified in the mode. For single session devices, the session
maximum is always one. </p>
</div>
<div class="section"><p><span class="keyword">iSeries server</span>s in a
DDM network that use <span class="keyword">OptiConnect</span> must
have the <span class="keyword">OptiConnect</span> software
and hardware installed. <span class="keyword">OptiConnect</span> replaces
the need for SNA communications line connections. </p>
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<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="rbae5prepddm.htm" title="There are several requirements that must be met for DDM to be used properly.">Prepare to use DDM</a></div>
</div>
<div class="relconcepts"><strong>Related concepts</strong><br />
<div><a href="../rzahj/rzahjovr.htm">APPC, APPN, and HPR</a></div>
<div><a href="../rzau3/rzau3kickoff.htm">OptiConnect</a></div>
<div><a href="../rzahg/rzahgicca2.htm">Connecting to iSeries: iSeries Access for Windows</a></div>
</div>
<div class="relinfo"><strong>Related information</strong><br />
<div><a href="http://publibfp.boulder.ibm.com/epubs/pdf/c4154010.pdf" target="_blank">Communications Configuration PDF</a></div>
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