98 lines
7.2 KiB
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98 lines
7.2 KiB
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<title> LANACKTMR and LANACKFRQ</title>
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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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