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This chapter provides instructions for configuring LUs and LU pools to support user applications that use 3270, TN3270, RJE, LU0,and LUA communications. To use these, you must configure dependent LUs.
Before you can configure the resources described in this chapter, you must perform the following configuration:
Configure the node as described in Configuring the Node.
Configure connectivity as described in Defining Connectivity Components. For 3270, TN3270, RJE, LU0,and LUA, you must configure the link to support dependent LU traffic.
You do not need to configure a direct link to the host if you are using upstream PU concentration or DLUR. For more information, see Configuring PU Concentration and Defining DLUR PUs.
You must configure dependent LUs of types 0-3 to support communication with a host system. You can use the information in this section to define an LU to support 3270, RJE, LU0, or LUA. You can also define a range of LUs, to configure multiple LUs of the same type in a single operation.
To configure an LU of types 0-3, use one of the following methods:
Select one of the following from the Services menu on the Node window.
3270 and either New 3270 display LU or New 3270 printer LU
RJE and New RJE LU
LUA and New LUA LU (use this option for either LUA or LU0)
TN server and New host LU
Issue one of the following commands:
define_lu_0_to_3
define_lu_0_to_3_range
You can use the advanced dialog to restrict access to a specific SSCP, or to specify an inactivity timeout.
If you are configuring a 3270 display LU for use with the SNAP-IX 3270 emulation program, and users may use this LU for file transfer, the host configuration for this LU must specify DFT mode (3279 configuration), and not CUT mode (screen mode). Although there will be no difference when using the LU for 3270 emulation, SNAP-IX does not support CUT mode file transfer. If an LU is configured at the host as CUT mode, any attempts to transfer files on a session using this LU will fail.
Check the host logmode table entry for the LU with your host administrator. The query bit in the PSERVIC operand of the MODEENT macro must be set to indicate a DFT mode LU; this means that the third hexadecimal digit (upper digit of the second byte) of the PSERVIC operand must be 8.
The following parameters are required for LU types 0-3 configuration:
An LU name of 1-8 characters (for a single LU) or a base name of 1-5 characters (for a range of LUs, a prefix is added to the base name to form all of the names for the LUs that are defined).
The LU name is used only locally; it does not need to correspond to a name defined on the host.
The link station that provides the link to the host. The LU definition belongs to the link station you select. (If the dependent LU resides on a node that supports DLUR, this field identifies the DLUR PU that provides connectivity to the host.)
An LU number or range of LU numbers. LU numbers can be from 1-255.
The LU numbers must correspond to those in the host VTAM configuration. If you do not know what numbers are configured on the host, consult your SNA network planner.
One of the following LU types (depending on the type of LU you are configuring):
For a 3270 display LU, specify the appropriate model based on the screen size:
3270 model 2 (80x24)
3270 model 3 (80x32)
3270 model 4 (80x43)
3270 model 5 (132x27)
For a printer LU, specify one of the following:
3270 printer
SCS printer
For an RJE workstation, specify RJE Workstation.
If you do not know the LU type, if the LU is used to support PU concentration from the local node to the host (an upstream LU), or if the LU is for an LUA or LU0 application, specify Unrestricted (unknown for command-line configuration).
The LU type should match the configuration of the LU at the host. If the host is using DDDLU, the LU may not be configured at the host. In this case, the LU type you specify here is used to define the LU on the host dynamically. Otherwise, the LU type configured at the host takes precedence.
Whether the LU is assigned to an LU pool.Only printer, display, and unrestricted (unknown) LUs can be members of a pool.
After performing the LU type 0-3 configuration, continue with the following configuration tasks:
To use a pool of dependent LUs for a 3270 display, for TN3270, for LU0, or for LUA, define the LU pool as described in Defining LU Pools.
For 3270, define emulator users as described in Configuring 3270 Emulator Users.
For 5250, define emulator sessions as described in Configuring 5250 Sessions.
For RJE, define the RJE workstation as described in Configuring RJE Workstations.
For TN3270, define TN3270 client access records as described in Configuring TN Server.
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