98 lines
7.2 KiB
HTML
98 lines
7.2 KiB
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<meta name="abstract" content="Your SNA controller description includes the LAN acknowledgment timer (LANACKTMR) and the LAN acknowledgment frequency (LANACKFRQ) parameters. They work together to determine how often to send an acknowledgment to the remote station." />
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<title> LANACKTMR and LANACKFRQ</title>
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</head>
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<body id="rzajylanacktmrandlanackfrq"><a name="rzajylanacktmrandlanackfrq"><!-- --></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"> LANACKTMR and LANACKFRQ</h1>
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<div><p>Your SNA controller description includes the LAN acknowledgment
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timer (LANACKTMR) and the LAN acknowledgment frequency (LANACKFRQ) parameters.
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They work together to determine how often to send an acknowledgment to the
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remote station.</p>
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<div class="section"><p>LANACKTMR specifies how long the system waits before
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sending an acknowledgment for the frames that it received. LANACKFRQ specifies
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the maximum number of frames that your system receives before sending an acknowledgment
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to the remote station (independent of timers or having data to send). Your
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system has a greater chance of sending the acknowledgment in a data frame
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(rather than the acknowledgment by itself) if the LANACKFRQ value is large.</p>
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<p>The
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default *CALC value for LANACKTMR is 0.1 second. The default *CALC value for
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LANACKFRQ is 1.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Performance issues</h4></div>
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<div class="section"><p>Large values for LANACKTMR and LANACKFRQ might be desirable because
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smaller values can cause unnecessary acknowledgments and contribute to heavier
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LAN traffic. If you are connected to a network with traffic problems, you
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can increase the values of either parameters or both parameters.</p>
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</div>
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<div class="section"><div class="p">However, in most cases where LAN traffic is not a problem and
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data tends to flow one way, large parameter values can cause this to happen: <ul><li>Introduce unnecessary delays when sending acknowledgments.</li>
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<li>Slow response times.</li>
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</ul>
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</div>
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</div>
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<div class="section"><h4 class="sectiontitle">LANACKTMR considerations</h4><p>You should choose values
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for the LANACKTMR parameter by carefully considering the remote station's
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response timer (LANRSPTMR) and maximum outstanding frame count (LANMAXOUT).</p>
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<p>For
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example, assume that your system cannot send an acknowledgment before the
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remote station's response timer expires. The remote station will retransmit
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its frame because it did not receive your acknowledgment. To solve this problem,
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you must either shorten your system's timer or lengthen the remote system's
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timer.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">LANACKFRQ considerations</h4><p>Similarly, you should choose
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values for LANACKFRQ by carefully considering the remote station's maximum
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outstanding frame count (LANMAXOUT). If you do not correctly adjust the counters,
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your system will wait for more frames. However, the remote station will not
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transmit them because it is waiting for an acknowledgment from your system.</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="rzajysnaoveratmtimingissues.htm">SNA over Ethernet timing parameters</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="rzajychangingtimingparameters.htm" title="Do these steps to change the LAN timing parameters.">Changing timing parameters</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="rzajylanrsptmrandlanfrmrty.htm" title="The LAN response timer (LANRSPTMR) and the LAN frame retry (LANFRMRTY) parameters in your controller description determine how soon and how often the system retransmits a frame.">LANRSPTMR and LANFRMRTY</a></div>
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<div><a href="rzajylaninactmr.htm" title="The LAN inactivity timer (LANINACTMR) parameter of your SNA controller description determines how long your system waits before requesting a response from the remote station. Your system uses the request to test if the remote station is still accessible.">LANINACTMR</a></div>
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<div><a href="rzajylanmaxout.htm" title="The Maximum outstanding data frames (LANMAXOUT) parameter of your SNA controller description specifies how many frames your system sends before waiting to receive an acknowledgment.">LANMAXOUT</a></div>
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<div><a href="rzajylanwdwstp.htm" title="The LAN window step (LANWDWSTP) parameter of your SNA controller description determines whether the number of outstanding frames are reduced during network congestion.">LANWDWSTP</a></div>
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<div><a href="rzajylanaccpty.htm" title="The LAN access priority (LANACCPTY) parameter of your SNA controller description determines a token's priority.">LANACCPTY</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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