Subsystem name request specification - Key = '005F'

DALSSNM specifies a subsystem name. You must specify the name of the subsystem that is to process the request for allocation unless you want the request processed by the default subsystem.

When you code DALSSNM to request a subsystem other than the default subsystem, # must be one, LEN specifies the length of the subsystem name (maximum of four) and PARM contains the subsystem name (one to four characters).
The first character of the subsystem name must be either alphabetic or national and the remaining characters must be either alphameric or national. See z/OS MVS JCL Reference for a list of the alphameric and national character sets.
When you code DALSSNM to request the default subsystem, # must be zero; LEN and PARM are not be specified.

DALSSNM is mutually exclusive with the SYSOUT (DALSYSOU), SYSOUT program name (DALSPGNM) and SYSOUT form number (DALSFMNO) keys.

Your installation's system programming staff can identify the subsystems at your installation that support DALSSNM requests.

Example 1:: To request subsystem SUB1, code

KEY    #      LEN    PARM
005F   0001   0004   E2 E4 C2 F1

Example 2:: To request the default subsystem, code

KEY    #      LEN   PARM
005F   0000   -     -