139 lines
7.2 KiB
HTML
139 lines
7.2 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
|
|
<!DOCTYPE html
|
|
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
<html lang="en-us" xml:lang="en-us">
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
|
<meta name="security" content="public" />
|
|
<meta name="Robots" content="index,follow" />
|
|
<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))' />
|
|
<meta name="DC.Type" content="reference" />
|
|
<meta name="DC.Title" content="Physical environment for frame relay" />
|
|
<meta name="abstract" content="This topic provides information about interface options for connecting equipment to a frame-relay network." />
|
|
<meta name="description" content="This topic provides information about interface options for connecting equipment to a frame-relay network." />
|
|
<meta name="DC.Relation" scheme="URI" content="rzak3overview.htm" />
|
|
<meta name="copyright" content="(C) Copyright IBM Corporation 2000, 2006" />
|
|
<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2000, 2006" />
|
|
<meta name="DC.Format" content="XHTML" />
|
|
<meta name="DC.Identifier" content="rzak3physenviron" />
|
|
<meta name="DC.Language" content="en-us" />
|
|
<!-- All rights reserved. Licensed Materials Property of IBM -->
|
|
<!-- US Government Users Restricted Rights -->
|
|
<!-- Use, duplication or disclosure restricted by -->
|
|
<!-- GSA ADP Schedule Contract with IBM Corp. -->
|
|
<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
|
|
<link rel="stylesheet" type="text/css" href="./ic.css" />
|
|
<title>Physical environment for frame relay</title>
|
|
</head>
|
|
<body id="rzak3physenviron"><a name="rzak3physenviron"><!-- --></a>
|
|
<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
|
|
<h1 class="topictitle1">Physical environment for frame relay</h1>
|
|
<div><p>This topic provides information about interface options for connecting
|
|
equipment to a frame-relay network.</p>
|
|
<div class="section"><p>The equipment that attaches to a frame-relay network,
|
|
such as an IBM<sup>®</sup> <span><img src="eserver.gif" alt="eServer" /></span> iSeries™ system, is the terminal equipment
|
|
(TE). A frame-relay network node is a frame handler (FH).</p>
|
|
</div>
|
|
<div class="section"><p>The connection from the TE to the FH normally exists through a
|
|
data service unit (DSU) and channel service unit (CSU) pair. This DSU and
|
|
CSU pair converts the TE physical interface to the FH interface that is used
|
|
by the frame-relay network.</p>
|
|
</div>
|
|
<div class="section"><p>The iSeries system
|
|
supports three physical interface types for attachment to the DSU and CSU
|
|
pair:</p>
|
|
</div>
|
|
<div class="section"> <ul><li>EIA RS-449, ITU-T V.36</li>
|
|
<li>ITU-T X.21</li>
|
|
<li>ITU-T V.35</li>
|
|
</ul>
|
|
</div>
|
|
<div class="section"><h4 class="sectiontitle">Create Network Interface (Frame Relay) (CRTNWIFR) command</h4></div>
|
|
<div class="section"><p>Use the CRTNWIFR command to specify both the physical
|
|
interface (INTERFACE parameter) and data transmission rate (LINESPEED parameter).
|
|
The type of physical interface that you specify depends on the cable that
|
|
you use. <a href="#rzak3physenviron__rzak3device">Table 1</a> lists the supported
|
|
physical interfaces, cable lengths, network interface (NWI) clock parameters,
|
|
and the maximum data transmission speed available for each interface:</p>
|
|
</div>
|
|
|
|
<div class="tablenoborder"><a name="rzak3physenviron__rzak3device"><!-- --></a><table cellpadding="4" cellspacing="0" summary="" id="rzak3physenviron__rzak3device" class="singleborder" frame="border" border="1" rules="all"><caption>Table 1. Device types 2699, 2721, 2742, 2745, 2771, and 2793 high-speed communications
|
|
IOAs</caption><thead align="left"><tr><th valign="top" width="25%" id="d0e63">Physical interface</th>
|
|
<th valign="top" width="25%" id="d0e65">Cable length</th>
|
|
<th valign="top" width="25%" id="d0e67">NWI clock parameter</th>
|
|
<th valign="top" width="25%" id="d0e69">Maximum data transmission rate</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody><tr><td rowspan="3" valign="top" width="25%" headers="d0e63 ">*RS-449</td>
|
|
<td valign="top" width="25%" headers="d0e65 ">6.1 m (20 ft)</td>
|
|
<td valign="top" width="25%" headers="d0e67 ">*MODEM, *LOOP, *INVERT</td>
|
|
<td valign="top" width="25%" headers="d0e69 ">2 048 000 bps</td>
|
|
</tr>
|
|
<tr><td valign="top" width="25%" headers="d0e65 ">15.2 m (50 ft) <p>24.4 m (80 ft)</p>
|
|
<p>45.7 m (150 ft)</p>
|
|
</td>
|
|
<td valign="top" width="25%" headers="d0e67 ">*MODEM</td>
|
|
<td valign="top" width="25%" headers="d0e69 ">64 000 bps</td>
|
|
</tr>
|
|
<tr><td valign="top" width="25%" headers="d0e65 ">15.2 m (50 ft) <p>24.4 m (80 ft)</p>
|
|
<p>45.7 m (150 ft)</p>
|
|
</td>
|
|
<td valign="top" width="25%" headers="d0e67 ">*LOOP</td>
|
|
<td valign="top" width="25%" headers="d0e69 ">2 048 000 bps</td>
|
|
</tr>
|
|
<tr><td rowspan="2" valign="top" width="25%" headers="d0e63 ">*V.35</td>
|
|
<td valign="top" width="25%" headers="d0e65 ">20 ft (6.1 m) <p>50 ft (15.2 m)</p>
|
|
</td>
|
|
<td valign="top" width="25%" headers="d0e67 ">*MODEM, *LOOP, *INVERT</td>
|
|
<td valign="top" width="25%" headers="d0e69 ">2 048 000 bps</td>
|
|
</tr>
|
|
<tr><td valign="top" width="25%" headers="d0e65 ">24.4 m (80 ft)</td>
|
|
<td valign="top" width="25%" headers="d0e67 ">*MODEM, *LOOP, *INVERT</td>
|
|
<td valign="top" width="25%" headers="d0e69 ">64 000 bps</td>
|
|
</tr>
|
|
<tr><td rowspan="2" valign="top" width="25%" headers="d0e63 ">*X.21</td>
|
|
<td valign="top" width="25%" headers="d0e65 ">6.1 m (20 ft)</td>
|
|
<td valign="top" width="25%" headers="d0e67 ">*MODEM</td>
|
|
<td valign="top" width="25%" headers="d0e69 ">2 048 000 bps</td>
|
|
</tr>
|
|
<tr><td valign="top" width="25%" headers="d0e65 ">15.2 m (50 ft)</td>
|
|
<td valign="top" width="25%" headers="d0e67 ">*MODEM, *INVERT</td>
|
|
<td valign="top" width="25%" headers="d0e69 ">64 000 bps</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
<div class="section"> <div class="note"><span class="notetitle">Notes:</span> <ol><li>*LOOP requires DCE support for looped clocking.</li>
|
|
<li>Data transmission rates greater than 512 000 bps might require *LOOP or
|
|
*INVERT clocking.</li>
|
|
</ol>
|
|
</div>
|
|
</div>
|
|
<div class="section"><p>On the frame-relay-supported hardware, the specified value for
|
|
the INTERFACE parameter must match the physical interface and cable that you
|
|
attached to the input-output adapter (IOA).</p>
|
|
</div>
|
|
<div class="section"><h4 class="sectiontitle">CLOCK parameter</h4></div>
|
|
<div class="section"><p>The CLOCK parameter on the CRTNWIFR command specifies the method
|
|
by which the clocking function is provided for the network interface. Possible
|
|
values are:</p>
|
|
</div>
|
|
<div class="section"> <dl><dt class="dlterm">*MODEM</dt>
|
|
<dd>The default value. The modem provides the clocking.</dd>
|
|
<dt class="dlterm">*LOOP</dt>
|
|
<dd>Indicates that the data circuit-terminating equipment (DCE) received clock
|
|
is looped back to the DCE on the data terminal equipment (DTE) transmit clock.
|
|
This value improves high-speed data transmission, but it is valid only if
|
|
supported by the modem.</dd>
|
|
<dt class="dlterm">*INVERT</dt>
|
|
<dd>All three interfaces support *INVERT.</dd>
|
|
</dl>
|
|
</div>
|
|
</div>
|
|
<div>
|
|
<div class="familylinks">
|
|
<div class="parentlink"><strong>Parent topic:</strong> <a href="rzak3overview.htm">Frame relay</a></div>
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html> |