67 lines
4.0 KiB
HTML
67 lines
4.0 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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<meta name="DC.Title" content="Commtrace model" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2006" />
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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>Commtrace model</title>
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</head>
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<body id="rzahhcommtracemodel"><a name="rzahhcommtracemodel"><!-- --></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">Commtrace model</h1>
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<div><p></p>
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<p>The following illustration shows how the commtrace classes correspond to
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a communications trace file. The graphic also indicates the naming conventions
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that the commtrace classes use for the components in a communications trace.</p>
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<p><a href="rzahhcommtraceprolog.htm#rzahhcommtraceprolog">Prolog</a>:
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An initial 256-byte section of a communications trace for a LAN line description.
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The Prolog contains general information about the trace, such as start and
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end times, number of bytes collected, and so on.</p>
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<p><a href="rzahhcommtraceframe.htm#rzahhcommtraceframe">Frame</a>:
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Records of varying length that contain the data that the iSeries™ server
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transmitted during the communcations trace.</p>
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<p><span class="synph" id="rzahhcommtracemodel__commtracemodel"><a name="rzahhcommtracemodel__commtracemodel"><!-- --></a><span class="kwd"></span></span><strong>Figure 1: Commtrace model</strong></p>
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<p><img src="rzahh587.gif" alt="Artwork for model" /></p>
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<p>Each Frame in the trace file contains two initial sections (that provide
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general information about the contents of the frame) and the packet that
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the iSeries
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server transmitted between itself and a different point on the network.</p>
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<p>The very first 24-byte section of data contains general information about
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the contents of the frame, such as the frame number and data length. Use
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the Frame class to process this information.</p>
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<p><a href="rzahhcommtracelanheader.htm#rzahhcommtracelanheader">LanHeader</a>:
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A section of data that occurs once in each frame (after the initial 24-bytes
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of data) and contains general information about the IPacket that follows.</p>
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<p><a href="rzahhcommtraceippacket.htm#rzahhcommtraceippacket">IPPacket</a>:
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A section of data, composed of one ore more headers and the associated data.
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IPPacket represents all the data packets that the network transmitted for
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this frame during the communications trace. IPPacket is an abstract class,
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so you will use the various concrete subclasses to process the headers and
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data in the packets.</p>
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<p><a href="rzahhcommtraceheader.htm#rzahhcommtraceheader">Header</a>:
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A section of data at the beginning of an IPPacket that describes the following
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packet data and, when appropriate, points to the next header. In the commtrace
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package, Header is an abstract class, so you will use the various concrete
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subclasses to process the data.</p>
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</div>
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</body>
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</html>
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