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<html><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><!--Converted with jLaTeX2HTML 2002 (1.62) JA patch-1.4patched version by: Kenshi Muto, Debian Project.LaTeX2HTML 2002 (1.62),original version by: Nikos Drakos, CBLU, University of Leeds* revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan* with significant contributions from: Jens Lippmann, Marek Rouchal, Martin Wilck and others --><HTML><HEAD><TITLE>35.3.0.0.1 Exponential On/Off</TITLE><META NAME="description" CONTENT="35.3.0.0.1 Exponential On/Off"><META NAME="keywords" CONTENT="everything"><META NAME="resource-type" CONTENT="document"><META NAME="distribution" CONTENT="global"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"><META NAME="Generator" CONTENT="jLaTeX2HTML v2002 JA patch-1.4"><META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css"><LINK REL="STYLESHEET" HREF="everything.css" tppabs="http://www.isi.edu/nsnam/ns/doc/everything.css"><LINK REL="next" HREF="node481.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node481.html"><LINK REL="previous" HREF="node479.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node479.html"><LINK REL="up" HREF="node479.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node479.html"><LINK REL="next" HREF="node481.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node481.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html8795" HREF="node481.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node481.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html8789" HREF="node479.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node479.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html8783" HREF="node479.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node479.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html8791" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html"><IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="file:/usr/share/latex2html/icons/contents.png"></A> <A NAME="tex2html8793" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html"><IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="file:/usr/share/latex2html/icons/index.png"></A> <BR><B> Next:</B> <A NAME="tex2html8796" HREF="node481.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node481.html">35.3.0.0.2 Pareto On/Off</A><B> Up:</B> <A NAME="tex2html8790" HREF="node479.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node479.html">35.3 The class TrafficGenerator</A><B> Previous:</B> <A NAME="tex2html8784" HREF="node479.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node479.html">35.3 The class TrafficGenerator</A>   <B> <A NAME="tex2html8792" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html8794" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html">Index</A></B> <BR><BR><!--End of Navigation Panel--><H4><A NAME="SECTION07130010000000000000">35.3.0.0.1 Exponential On/Off</A></H4>An Exponential On/Off object is embodied in the OTcl classApplication/Traffic/Exponential. The member variables that parameterize thisobject are:<BR><BR>Hence a new Exponential On/Off traffic generator can be created and parameterized as follows:<PRE> set e [new Application/Traffic/Exponential] $e set packetSize_ 210 $e set burst_time_ 500ms $e set idle_time_ 500ms $e set rate_ 100k</PRE><P><B>NOTE:</B> The Exponential On/Off generator can be configured to behaveas a <B>Poisson process</B> by setting the variable <TT>burst_time_</TT> to <TT>0</TT>and the variable <TT>rate_</TT> to a very large value. The C++ codeguarantees that even if the burst time is zero, at least one packet issent. Additionally, the next interarrival time is the sum of theassumed packet transmission time (governed by the variable <TT>rate_</TT>) and the random variate corresponding to <TT>idle_time_</TT>. Therefore, to make the first term in the sum very small, make the burstrate very large so that the transmission time is negligible compared tothe typical idle times.<P><BR><HR><ADDRESS>2003-09-23</ADDRESS></BODY></HTML>⌨️ 快捷键说明
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