Initializing the LU-mode table

LU 6.2 architecture specifies that the partner LU and mode name pairs be explicitly defined during system definition. By dynamically defining LU and mode entries for the application program, VTAM® removes the burden of additional system definition and coordination that is required by the architectural implementation of the LU-mode table. See VTAM's LU-mode table for more discussion about updating information in the LU-mode table.

When an LU-mode pair is first added to the LU-mode table, VTAM associates it with the following LU 6.2-specific operands that are supplied on the application program's APPL definition statement:

ATNLOSS
AUTOSES
DDRAINL
DMINWNL
DMINWNR
DRESPL
DSESLIM
LIMQSINT
LMDENT
OPERCNOS
SECACPT
SYNCLVL
VERIFY

Refer to z/OS Communications Server: SNA Resource Definition Reference for a description of these operands.

After VTAM places the LU-mode pair in the table, the values determined by the APPL definition statement can be changed for only the following operands:

AUTOSES
DDRAINL
DMINWNL
DMINWNR
DRESPL
DSESLIM

The MODIFY DEFINE operator command and the APPCCMD CONTROL=OPRCNTL, QUALIFY=DEFINE macroinstruction explain how to change these values. Refer to z/OS Communications Server: SNA Operation for a description of the MODIFY DEFINE command.