--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/PDK/Source/GUID-375C5C68-67C0-5414-9D41-DDD76692DC81.dita	Fri Jan 22 18:26:19 2010 +0000
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+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
+<!-- This component and the accompanying materials are made available under the terms of the License 
+"Eclipse Public License v1.0" which accompanies this distribution, 
+and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
+<!-- Initial Contributors:
+    Nokia Corporation - initial contribution.
+Contributors: 
+-->
+<!DOCTYPE concept
+  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<concept id="GUID-375C5C68-67C0-5414-9D41-DDD76692DC81" xml:lang="en"><title>Traffic
+Classes</title><shortdesc> Traffic Classes are used to categorise the types of communication
+carried by a Universal Mobile Telephone System (UMTS).</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>When implementing QoS within a UMTS you can divide the types of traffic
+that can be carried into classes based on their characteristics. Also, with
+the bandwidth, latency, and reliability there are some characteristics that
+the network needs to adapt if it has to carry the traffic effectively. Two
+of these are whether the traffic comes intermittently and whether the upstream
+and downstream traffic characteristics are symmetric or asymmetric. </p>
+<p>The traffic classes carried by a UMTS are divided into the following categories: </p>
+<ul>
+<li id="GUID-6FA20E30-9FB2-5E94-A927-5761E2E102B8"><p> <b>Conversational Traffic
+Class (Voice telephony)</b> - This is characterized by a fixed, and relatively
+small bandwidth with a small latency and comparatively less number of transmission
+errors. The upstream and downstream data rates are symmetrical. </p> </li>
+<li id="GUID-06BD9213-2841-5325-AC89-66F0FEAF6ED4"><p> <b>Streaming Traffic
+Class</b> - This class of traffic is continuous data such as streaming video.
+Some errors can be tolerated for example, dropped lines in a single video
+frame. The data rates are high and generally asymmetrical. </p> </li>
+<li id="GUID-A2708944-1C45-5C5C-A62D-8BB41B3D9C22"><p> <b>Interactive Traffic
+Class</b> - This class of traffic handles user request or server response
+traffic such as web browsing. It is medium bandwidth, must be reliable and
+is intermittent asymmetric data. Unlike the other classes different priorities
+can be attached to interactive traffic. </p> </li>
+<li id="GUID-DD1AC5DC-BE61-5C7D-A91E-164B813AF9FA"><p> <b>Background Traffic
+Class</b> - This traffic is low volume occasional traffic such as an Email.
+A reasonable delay is acceptable to the user but reliability must be high. </p> </li>
+</ul>
+<p>The following table illustrates the characteristics of these classes: </p>
+<table id="GUID-A640819E-C63F-583B-9C73-6252BE86D789">
+<tgroup cols="6"><colspec colname="col0"/><colspec colname="col1"/><colspec colname="col2"/><colspec colname="col3"/><colspec colname="col4"/><colspec colname="col5"/>
+<thead>
+<row>
+<entry>Traffic Class</entry>
+<entry>Acceptable Bandwidth</entry>
+<entry>Acceptable Latency</entry>
+<entry>Acceptable Reliability</entry>
+<entry>Intermittent Data</entry>
+<entry>Asymmetric</entry>
+</row>
+</thead>
+<tbody>
+<row>
+<entry><p>Conversational </p> </entry>
+<entry><p>Low </p> </entry>
+<entry><p>Low </p> </entry>
+<entry><p>Low </p> </entry>
+<entry><p>No </p> </entry>
+<entry><p>No </p> </entry>
+</row>
+<row>
+<entry><p>Streaming </p> </entry>
+<entry><p>High </p> </entry>
+<entry><p>Medium </p> </entry>
+<entry><p>Medium </p> </entry>
+<entry><p>No </p> </entry>
+<entry><p>Yes </p> </entry>
+</row>
+<row>
+<entry><p>Interactive </p> </entry>
+<entry><p>Medium </p> </entry>
+<entry><p>Medium </p> </entry>
+<entry><p>High </p> </entry>
+<entry><p>Yes </p> </entry>
+<entry><p>Yes </p> </entry>
+</row>
+<row>
+<entry><p>Background </p> </entry>
+<entry><p>Low </p> </entry>
+<entry><p>High </p> </entry>
+<entry><p>High </p> </entry>
+<entry><p>Yes </p> </entry>
+<entry><p>Yes </p> </entry>
+</row>
+</tbody>
+</tgroup>
+</table></conbody></concept>
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