65 lines
3.7 KiB
HTML
65 lines
3.7 KiB
HTML
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<?xml version="1.0" encoding="utf-8"?>
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<!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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<html xmlns="http://www.w3.org/1999/xhtml" lang="en-US" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="dc.language" scheme="rfc1766" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<meta name="dc.date" scheme="iso8601" content="2005-09-06" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow"/>
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<title>Token-ring networks</title>
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<link rel="stylesheet" type="text/css" href="ibmidwb.css" />
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<link rel="stylesheet" type="text/css" href="ic.css" />
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</head>
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<body>
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<a id="Top_Of_Page" name="Top_Of_Page"></a><!-- Java sync-link -->
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<script language = "Javascript" src = "../rzahg/synch.js" type="text/javascript"></script>
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<a name="rzajttrn-con"></a>
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<h4 id="rzajttrn-con">Token-ring networks</h4>
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<p>A token-ring network is one LAN topology that sends data in one direction
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throughout a specified number of locations by using the token. The token is
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the symbol of authority for control of the transmission line. This token allows
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any sending station in the network (ring) to send data when the token arrives
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at that location.</p>
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<p>Stations in a token-ring network are physically connected, typically in
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a star-wired ring topology, to a wiring concentrator such as the IBM® 8228 Multistation
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Access Unit. The concentrator serves as a logical ring around which data
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is transmitted at 4 million, 16 million, or 100 million bits per second (Mbps).
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Each station is connected to the concentrator typically by shielded twisted
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pair (STP) cabling.
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</p>
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<dl>
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<dt class="bold">Full-duplex token ring</dt>
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<dd>In full-duplex token ring, which is also called DTR (dedicated token
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ring), switching hubs enable stations to send and receive data on the network
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simultaneously. A token-ring switching hub divides the network into smaller
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segments. When a station transmits its data packet, the token-ring switch
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reads the packet's destination address information and forwards the data directly
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to the receiving station. The switch then establishes a dedicated connection
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between the two stations, enabling data to be transmitted and received at
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the same time. In full-duplex token ring, the token-passing protocol is suspended.
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The network in effect becomes a 'tokenless' token ring. Full-duplex token
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ring increases sending and receiving bandwidth for connected stations, improving
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network performance.
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</dd>
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</dl>
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<p>For more information, see the <a href="../rzaju/rzajuoverview.htm">Token ring topic
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collection</a>.</p>
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<a id="Bot_Of_Page" name="Bot_Of_Page"></a>
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</body>
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</html>
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