100 lines
6.5 KiB
HTML
100 lines
6.5 KiB
HTML
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Virtual device descriptions" />
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<meta name="abstract" content="This topic provides information about configuring and naming virtual device descriptions." />
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<title>Virtual device descriptions</title>
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</head>
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<body id="rzaiwplanvirtdevice"><a name="rzaiwplanvirtdevice"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Virtual device descriptions</h1>
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<div><p>This topic provides information about configuring and naming virtual
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device descriptions.</p>
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<p>Telnet uses virtual device descriptions to maintain client workstation
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information for open Telnet sessions. A <span class="uicontrol">virtual device</span> is
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a device description that is used to form a connection between a user and
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a physical workstation attached to a remote system. Virtual devices provide
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information about your physical device (display or printer) to the programs
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on the server. The server looks for the attaching client/server protocol to
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specify a virtual device. If the server cannot find a specified virtual device,
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it then looks for a designated virtual device in a registered exit program.
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If the server cannot find a virtual device, it then attempts to match a virtual
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device description with a device type and model similar to the device on your
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local system.</p>
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<div class="section"><h4 class="sectiontitle">Telnet naming conventions for virtual controllers and devices</h4><p>The
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Telnet server uses the following conventions for naming automatically created
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virtual controllers and devices, according to the i5/OS<sup>®</sup> standards:</p>
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<ul><li>For virtual controller, the server uses the name QPACTL <var class="varname">nn</var> where <var class="varname">nn</var> is
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a decimal number of 01 or greater.</li>
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<li>For virtual devices, the server uses the name QPADEV <var class="varname">xxxx</var> where <var class="varname">xxxx</var> is
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an alphanumeric character from 0001 to <var class="varname">zzzzz</var>, excluding
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vowels.</li>
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<li>For named virtual devices, the server gives the virtual controllers the
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name of QVIRCD <var class="varname">nnnn</var></li>
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</ul>
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<div class="note"><span class="notetitle">Notes:</span> <ol><li>Under the i5/OS naming convention, the virtual controller must
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have a name of QPACTL <var class="varname">nn</var>.</li>
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<li>The virtual device has a name of QPADEV <var class="varname">xxxx</var>.</li>
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<li>You must grant the QTCP user profile authority to the user-created virtual
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devices.</li>
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<li>You can change the naming conventions for automatically created virtual
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devices by using the *REGFAC option of QAUTOVRT. Refer to <a href="../rzakz/rzakzqautovrt.htm">QAUTOVRT</a> in the
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System Values topic for more information.</li>
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</ol>
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</div>
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<p>The number of sign-on attempts allowed increases with automatically configured
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virtual devices. The total amount of sign-on attempts is equal to the number
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of system sign-on attempts that are allowed, multiplied by the number of virtual
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devices that can be created. The Sign-on System Values define the number of
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sign-on attempts allowed.</p>
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<p>The Telnet server reuses available existing
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virtual devices that were automatically created by selecting virtual devices
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of the same device type and model. When no more device types and models match
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but virtual devices are still available, then the device type and model are
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changed to match the client device and model negotiated. This is true for
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both automatically created (QPADEV <var class="varname">xxxx</var> ) virtual devices,
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and named virtual devices.</p>
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<p>If you choose to manually create your own
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devices, you should establish naming conventions that allow you to easily
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manage your configuration. You can select whatever device names and controller
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names that you want, provided that the names conform to the i5/OS object
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naming rules.</p>
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<p>For procedures for creating virtual devices, see Set the
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number of virtual devices.</p>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaiwtelsetup.htm" title="Use this topic to determine the number of virtual devices to associate with the workstations that are connected to your system. This topic also provides security procedures for controlling or preventing access to Telnet.">Plan for the Telnet server</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzaiwcrtvirdev.htm" title="You can manually create virtual devices, with custom names or automatically generated names.">Create your own virtual devices</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="rzaiwnamdev.htm" title="You can read this topic for instructions on configuring the number of virtual devices for the Telnet server and limiting the number of signon attempts allowed.">Set the number of virtual devices</a></div>
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</div>
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</div>
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</body>
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