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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>14.3 Channel Class</TITLE><META NAME="description" CONTENT="14.3 Channel Class"><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="node149.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node149.html"><LINK REL="previous" HREF="node144.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node144.html"><LINK REL="up" HREF="node142.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node142.html"><LINK REL="next" HREF="node146.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node146.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html3519" HREF="node146.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node146.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html3513" HREF="node142.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node142.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html3507" HREF="node144.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node144.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html3515" 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="tex2html3517" 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="tex2html3520" HREF="node146.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node146.html">14.3.1 Channel State</A><B> Up:</B> <A NAME="tex2html3514" HREF="node142.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node142.html">14. Local Area Networks</A><B> Previous:</B> <A NAME="tex2html3508" HREF="node144.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node144.html">14.2 Components of a</A>   <B> <A NAME="tex2html3516" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html3518" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html">Index</A></B> <BR><BR><!--End of Navigation Panel--><H1><A NAME="SECTION031130000000000000000"></A><A NAME="sec:channel"></A><BR>14.3 Channel Class</H1><P>The <TT>Channel</TT> class simulates the actual transmission of the packetat the physical layer. The basic <TT>Channel</TT> implements a sharedmedium with support for contention mechanisms. It allows the MAC tocarry out carrier sense, contention, and collision detection. If morethan one transmissions overlaps in time, a channel raises the collisionflag. By checking this flag, the MAC object can implement collision detectionand handling.<P>Since the transmission time is a function of the number of bits in thepacket and the modulation speed of each individual interface (MAC), the<TT>Channel</TT> object only sets its busy signal for the durationrequested by the MAC object. It also schedules the packets to bedelivered to the destination MAC objects after the transmission timeplus the propagation delay.<P><BR><HR><!--Table of Child-Links--><A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A><UL><LI><A NAME="tex2html3521" HREF="node146.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node146.html">14.3.1 Channel State</A><LI><A NAME="tex2html3522" HREF="node147.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node147.html">14.3.2 Example: Channel and classifier of the physical layer</A><LI><A NAME="tex2html3523" HREF="node148.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node148.html">14.3.3 Channel Class in C++</A></UL><!--End of Table of Child-Links--><BR><HR><ADDRESS>2003-09-23</ADDRESS></BODY></HTML>⌨️ 快捷键说明
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