85 lines
5.0 KiB
HTML
85 lines
5.0 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 name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Physical network problems" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1999, 2006" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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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>Physical network problems</title>
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</head>
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<body id="rzajyphysicalnetworkproblems"><a name="rzajyphysicalnetworkproblems"><!-- --></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">Physical network problems</h1>
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<div><div class="section"><p>If your adapter card cannot make a connection to the network,
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and the Product Activity Log points to a physical network problem, check the
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following problem areas:</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Cabling problems</h4><div class="p"> <ul><li>Check that your cable type is appropriate for the line speed you are using.
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For example, category 3 cable cannot be used for 100 Mbps.</li>
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<li>Is the cable wired correctly?</li>
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<li>Do all cables, patch cables, and patch panels between the <span class="keyword">iSeries™</span> and
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the network, switch or hub support your line speed? For example, if the line
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speed is configured at 100 Mbps, the cable must be category 5 to support the
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speed.</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">Possible solutions</h4><ul><li>If the cables have been excessively bent or stretched, the wiring inside
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the cable might have been untwisted, damaged, or even broken. Try reseating
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the cable or temporarily replacing it with a functional one.</li>
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<li>Make sure that you are not using crossover cable.</li>
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<li>Route the cable away from electrically noisy devices, such as fluorescent
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lights, printers, copiers, or electric motors. These items can cause interference
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with data transmissions.</li>
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<li>Try plugging the cable into a different switch or hub port.</li>
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<li>Check that the switch or hub has the latest software from the vendor.</li>
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<li>You might want to add lightning protection to your network cabling and
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switch or hub power lines, if you live in a lightning prone area. A direct
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strike can cause a large power surge, which can severely damage your networking
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equipment and cabling.</li>
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</ul>
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</div>
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<div class="section"><h4 class="sectiontitle">Configuration problem checks and solutions</h4><ul><li>Check that the line speed and duplex mode chosen in CRTLINETH are the
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same as the parameters programmed into the switch or hub port. One frequent
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cause of problems is a duplex or line speed mismatch <div class="note"><span class="notetitle">Note:</span> To use the *AUTO
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configuration for line speed or duplex mode, you must configure both of the
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parameters to *AUTO. Do not use line speed and duplex configurations of 10/AUTO,
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100/AUTO, AUTO/Half, or AUTO/Full. These configurations might work, but you
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will have frequently unsuccessful and incorrect connections. </div>
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</li>
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<li>Try varying the line off and then on again with *RESET. Do not use *RESET
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if an MFIOP is the IOP! This might shut down the entire machine
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because other devices that share the MFIOP will not be able to access the
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line.</li>
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<li>If you suspect the adapter might be faulty, run VFYCMN with an external
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wrap plug attached. If this test is passed, the adapter card is not likely
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to be the problem.</li>
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<li>Connect a LAN analyzer to verify that the actual line speed and duplex
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mode being used on the link between the <span class="keyword">iSeries</span> and
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the hub or switch is accurate.</li>
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</ul>
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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="rzajytroubleshootingethernet.htm" title="Having problems with your server and connections? Get tips on why connections might fail, why frames are dropped, or why PCs cannot connect to your system.">Troubleshoot Ethernet</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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