81 lines
5.4 KiB
HTML
81 lines
5.4 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="LAN device connection initiation" />
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<meta name="abstract" content="In an SNA environment you can determine which server initiates the connection request and which server waits for an incoming connection request." />
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<meta name="description" content="In an SNA environment you can determine which server initiates the connection request and which server waits for an incoming connection request." />
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<meta name="DC.Relation" scheme="URI" content="rzajyconnectinglandevices.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzajylancnntmrandlancnnrty.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzajyconfailureandcntrlrdesc.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1999, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1999, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzajylandeviceconinitiation" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>LAN device connection initiation</title>
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</head>
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<body id="rzajylandeviceconinitiation"><a name="rzajylandeviceconinitiation"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">LAN device connection initiation</h1>
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<div><p>In an SNA environment you can determine which server initiates
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the connection request and which server waits for an incoming connection request.</p>
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<p> To have your server initiate the connection, you can configure the controller
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description to dial the destination. If no connection is established, your
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controller description automatically switches to answer mode.</p>
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<p>To have your server wait for incoming calls, you can configure the controller
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description to answer the incoming calls. You specify the mode through the
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Initial connection (INLCNN) field of the controller description:</p>
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<div class="section"><h4 class="sectiontitle">Dial mode (SNA)</h4><p>SNA controller descriptions use
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dial mode to send a connection request to a remote device. Dial mode typically
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starts when varying on the controller description. However, if the DIALINIT
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parameter is set to *DELAY, dial mode will not begin until an application
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opens a file that uses the connection. During the dialing process, the server
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polls the remote device to determine if the device is available. If the remote
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device is available, the connection process continues. Successful connection
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is still possible even if the local and remote devices dial each other simultaneously.</p>
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<p>The
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controller description fields below set the frequency and duration of the
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poll:</p>
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<ul><li>LAN connection retry (LANCNNRTY) determines the number of times your server
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polls the remote device. </li>
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<li>LAN connection timer (LANCNNTMR) determines the length of time between
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each poll. </li>
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</ul>
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<p>If the remote device answers the poll within the time specified by
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the parameters, your server proceeds with establishing the connection. If
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not, your server sends an inquiry message (CPA58E0 or CPA57EF) to the configured
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message queue. This message indicates that a connection attempt failed and
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that the controller description is now in answer mode.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Answer mode (SNA)</h4><p>If you specify answer mode, the
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input/output adapter (IOA) does not originate connection requests, but will
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respond to incoming connection requests. Servers with controller descriptions
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that are configured with dial mode will initiate and accept connection requests.
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However, APPC controllers that are user owned (CTLOWN = *USER) must be varied
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on before the server can respond to connection requests.</p>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzajyconnectinglandevices.htm" title="The correct line and controller descriptions will help you achieve successful connections.">Connect LAN devices</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="rzajylancnntmrandlancnnrty.htm" title="The LAN connection timer (LANCNNTMR) and LAN connection retry (LANCNNRTY) parameters of your controller description define the frequency and persistence of polling the remote station to establish a connection">LANCNNTMR and LANCNNRTY</a></div>
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<div><a href="rzajyconfailureandcntrlrdesc.htm">Connection failure and controller descriptions</a></div>
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</div>
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</div>
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</body>
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</html>
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