60 lines
3.5 KiB
HTML
60 lines
3.5 KiB
HTML
<?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>X.25 network</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="rzajtx25-con"></a>
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<h4 id="rzajtx25-con">X.25 network</h4>
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<p>X.25 is a Telecommunications Standardization Sector (ITU-T) recommendation
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that defines the physical level (physical layer), link level (data link layer),
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and packet level (network layer) of the OSI reference model. A X.25 network
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is an interface between data terminal equipment (DTE) and data circuit-terminating
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equipment (DCE) that operates in the packet mode, which is connected to public
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data networks by dedicated circuits. X.25 networks use the connection-mode
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network service.</p>
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<p>An iSeries™ X.25 line can be connected through a packet-switching data network
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(PSDN) and an adjacent remote system by using either a nonswitched or switched
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physical line. A switched line connection is one that is established on demand
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between the iSeries system and the X.25 network. On nonswitched line
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connections, the iSeries system supports both switched virtual circuits
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(SVCs) and permanent virtual circuits (PVCs). Only SVCs are supported on switched
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physical lines.</p>
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<p>One X.25 line supports one or more virtual circuits. Each virtual circuit
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can support one of the following:</p>
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<ul>
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<li>One or more Systems Network Architecture (SNA) sessions that can include
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Advanced Program-to-Program communications (APPC), SNA upline facility , remote
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work stations, or finance communications</li>
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<li>One connection to an asynchronous communications host system (the primary
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or controlling computer in a communications network)</li>
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<li>One connection to an asynchronous device through the X.25 network packet
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assembler/disassembler (PAD) function</li>
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<li>One connection to an asynchronous communications host system through iSeries PAD emulation</li>
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<li>One user-defined communications facility</li>
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<li>One Transmission Control Protocol/Internet Protocol (TCP/IP) link to an
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adjacent IP node or gateway. (A gateway is a device that is used to connect
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two systems that use two different communications protocols)</li></ul>
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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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