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140 lines
3.8 KiB
HTML
140 lines
3.8 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<!-- UDP.html (C) K. J. Turner 18/12/14 -->
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>User Datagram Protocol</title>
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<link rev="made" href="http://www.cs.stir.ac.uk/~kjt/"/>
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<script type="text/javascript" language="JavaScript">
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<!--
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var simulator;
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var spA;
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var dpA;
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var spB;
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var dpB;
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function valid(port, address, user) {
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if (address < 0 || address > 65535) {
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alert ("Port address for User " + user + " must be in range 0-65535");
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return false;
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}
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else
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return true;
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}
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function set() {
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spA = document.settings.SourcePortA.value.toString();
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dpA = document.settings.DestPortA.value.toString();
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spB = document.settings.SourcePortB.value.toString();
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dpB = document.settings.DestPortB.value.toString();
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if (valid("source", spA, "A") && valid("destination", dpA, "A") &&
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valid("source", spB, "B") && valid("destination", dpB, "B")) {
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simulator.setParameter("sourcePortA", spA);
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simulator.setParameter("destPortA", dpA);
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simulator.setParameter("sourcePortB", spB);
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simulator.setParameter("destPortB", dpB);
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simulator.updateActionList();
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}
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}
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//-->
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</script>
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</head>
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<body background="simulator.jpeg"
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onload="simulator=document.ProtocolSimulator; set();">
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<div style="text-align: center">
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<h1>User Datagram Protocol Simulator</h1>
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<img src="simulator.gif" alt="Simulator Logo"/>
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</div>
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<h2>Protocol Description</h2>
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<p>
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UDP (User Datagram Protocol) is a simple connection-less protocol for
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transferring datagrams in either direction between a pair of user ports.
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Each datagram is identified by its source and destination port numbers
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(in the range 0 to 65535).
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</p>
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<h2>Protocol Parameters</h2>
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<form name="settings">
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<center>
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<table cellspacing="5">
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<tr>
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<td align="right">User A Source Port</td>
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<td><input type="text" name="SourcePortA" value="11" size="5"/></td>
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<td align="right">User A Destination Port</td>
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<td><input type="text" name="DestPortA" value="22" size="5"/> </td>
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</tr>
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<tr>
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<td align="right">User B Source Port</td>
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<td><input type="text" name="SourcePortB" value="33" size="5"/></td>
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<td align="right">User B Destination Port</td>
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<td><input type="text" name="DestPortB" value="44" size="5"/></td>
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</tr>
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<tr>
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<td align="center" colspan="4">
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<input type="button" name="btnSet" value="Change Settings"
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onclick="set()"/>
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</td>
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</tr>
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</table>
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</center>
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</form>
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<h2>Protocol Simulation</h2>
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<p>
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The protocol simulation shows a time-sequence diagram with users A and B,
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protocol entities A and B that support them, and a communications medium
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that carries messages. Users request data transmissions with
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<em>DatReq(Src,Dst,Dn)</em> and receive data transmissions as
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<em>DatInd(Src, Dst,Dn)</em>. Data messages are simply numbered <em>D0</em>,
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<em>D1</em>, etc. in sequence for each user; no explicit data content is
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given. Each user request leads to the protocol message
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<em>DT(Src,Dst,Dn)</em> that gives the source port, destination port and
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data message number.
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</p>
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<center>
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<applet code="simulator.ProtocolSimulator.class"
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archive="ProtocolSimulator.jar" width="750" height="700"
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name="ProtocolSimulator">
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<param name="protocol" value="UDP"/>
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</applet>
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</center>
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<hr/>
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<p>
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<a href="index.html"><img src="uparrow.gif" alt="Up Arrow"/></a>
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Up one level to <a href="index.html">Protocol Simulators</a>
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</p>
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</body>
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</html>
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