74 lines
5.2 KiB
HTML
74 lines
5.2 KiB
HTML
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<title>The LANACKTMR and LANACKFRQ parameters</title>
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<body id="lanacktmr_and_lanackfrq"><a name="lanacktmr_and_lanackfrq"><!-- --></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">The LANACKTMR and LANACKFRQ parameters</h1>
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<div><p>Your Systems Network Architecture (SNA) controller description
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includes the LAN acknowledgment timer (LANACKTMR) and the LAN acknowledgment
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frequency (LANACKFRQ) parameters. They work together to determine how often
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to send an acknowledgment to the remote station.</p>
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<p>LANACKTMR specifies how long the system waits before sending an acknowledgment
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for the frames that it received. LANACKFRQ specifies the maximum number of
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frames that your system receives before sending an acknowledgment to the remote
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station (independent of timers or having data to send). Your system has a
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greater chance of sending the acknowledgment in a data frame (rather than
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the acknowledgment by itself) if the LANACKFRQ value is large.</p>
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<p><strong>Performance problems:</strong></p>
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<p>Large values for LANACKTMR and LANACKFRQ might be what you want 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 class="p">However, in most cases where LAN traffic is not a problem and data tends
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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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<p><strong>LANACKTMR considerations:</strong></p>
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<p>You should choose values for the LANACKTMR parameter by carefully considering
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the remote station's response timer (<a href="rzajylanrsptmrandlanfrmrty.htm#lanrsptmr_and_lanfrmrty">LANRSPTMR</a>)
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and maximum outstanding frame count (<a href="rzajylanmaxout.htm#lanmaxout">LANMAXOUT</a>).</p>
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<p>For example, assume that your system cannot send an acknowledgment before
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the 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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<p><strong>LANACKFRQ considerations:</strong></p>
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<p>Similarly, you should choose values for LANACKFRQ by carefully considering
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the remote station's maximum outstanding frame count (<a href="rzajylanmaxout.htm#lanmaxout">LANMAXOUT</a>).
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If you do not correctly adjust the counters, your system will wait for more
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frames. However, the remote station will not transmit them because it is waiting
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for an acknowledgment from your system.</p>
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<p>To change these parameters, see <a href="rzajychangingtimingparameters.htm#changing_timing_parameters">Change timing parameters</a>.</p>
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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="rzajysnaoveratmissues.htm" title="You can make timing adjustments through the parameters of the Systems Network Architecture (SNA) controller description.">Timing parameters</a></div>
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