LU and Application Assignments

Client identifiers are used to match clients to VTAM LUs and to connect the clients to applications. Use this panel to indicate which LUs will be assigned to this client identifier and to specify how the clients get assigned to applications.

When a client connects to the TN3270 server, the server searches the client identifiers to find a match. For example, if this client identifier is an IP address group and a client connects to the server, the server looks to see if the clients IP address is one of the IP addresses in the IP address group. If a match is found, the server determines which LUs are assigned to the client identifier and in turn assigns the client's connection to one of these LUs. Likewise, the server determines the application access method that has been assigned to the client identifier and uses the assigned method to allow the client to access the correct application.

You assign LUs to the client identifier for clients that connect as terminals and separate ones for clients that connect as printers. You may not have clients that are printers and you are not required to assign LUs for clients that are printers. There are no LUs assigned by default. For both printers and terminals, you can assign either individual LUs or groups of LUs. This panel is also used to create and manage all LU groups.

When assigning applications to the client identifier, you must understand some characteristics of the connecting clients. If the client is a terminal, then it is likely connecting in to an application that provides full screen TN3270 support. However, it may be connecting to a line mode application such as TSO. There are several ways of setting up application access based on the characteristics of the client and the application.

It is recommended that you assign all desired application access and enough LUs for all clients that match this client identifier. However, such assignments are not required. It is possible that you define multiple client identifiers that match a specific client. One of the client identifiers may be assigned LUs, but no application access. The other client identifier may be assigned application access, but no LUs. In this case the TN3270 server will use an LU from one client identifier and the application access from the other client identifier to setup the client's session. You are required to assign at least one LU or application access to the client identifier, otherwise the client identifier does not provide any function. If you do not assign all necessary LUs or all application access to this client identifier, you should must be cautious that you understand the interaction between multiple client identifiers.

Before you begin, decide whether you want to make application assignments and how you want to make LU assignments.

Steps

  1. You must assign at least one LU for either terminal clients or printer clients or at least one application/USS table. Use the Assign LUs... button to make your LU assignments. This will allow you to assign either individual LUs or LU groups for both terminal clients and printer clients.
  2. You may assign as many individual LUs or groups as needed using the Assign LUs... button.
  3. You may want to override the application access defaults. To do this, use the Assign application... button.
  4. If you want to edit or remove an LU or an application assignment in the left window, select it and click on the edit button or the remove button. If an individual terminal LU or terminal LU group is assigned, you may edit the assignment and associate a printer.
  5. If you want to add, edit or delete LU groups, click on Add and you can specify a new LU group name and group type. You can also edit and delete LU groups by selecting them and clicking on the action you want to perform.

You have completed this panel after you have assigned at least one LU.

Fields

LU and application assignments

LU groups currently defined

Push buttons for LU and application assignments
Click Assign LUs to assign terminal and printer LUs and LU groups to clients.
Click Assign application to set the applications for the clients.
Click Edit to edit an LU or application assignment.
Click Remove to remove an LU or application assignment.

Push buttons for LU groups currently defined
Click Add to add a terminal or printer LU group name.
Click Edit to edit a terminal or printer LU group name.
Click Remove to remove a group name.