An installation can create logon modes with varying communication characteristics. These additional logon modes must be entries in a logon mode table contained in SYS1.VTAMLIB. All the logon modes used by an LU should be contained in the table specified in the LU's APPL definition statement.

When an LU uses a number of different logon modes, it might be worthwhile to place those logon modes in a separate logon mode table specifically for the LU. SYS1.SAMPLIB member ATBLMODE contains an example logon mode table with three logon modes, including SNASVCMG, which is required by APPC/MVS.

If you create a new logon mode table, specify the table name after the MODETAB parameter in the LU's APPL statement.

For more information about logon mode tables and logon mode entries, see z/OS Communications Server: SNA Resource Definition Reference. For information about specific session characteristics, such as pacing and controlling the amount of data to pass, see z/OS Communications Server: SNA Network Implementation Guide.