PSSTRACE start option

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   .-PSSTRACE--=--NORB-----.   
>>-+-----------------------+-----------------------------------><
   '-PSSTRACE--=--+-NORB-+-'   
                  +-IRB--+     
                  +-SRB--+     
                  '-BOTH-'     

Specifies whether IRB trace entries, SRB trace entries, both, or neither should be generated when the VTAM® internal trace (VIT) is turned on with OPTION=PSS or OPTION=ALL.
PSSTRACE=IRB
Includes IRB entries in the VTAM internal trace.
PSSTRACE=SRB
Includes SRB entries in the VTAM internal trace.
PSSTRACE=BOTH
Includes IRB and SRB entries in the VTAM internal trace.
PSSTRACE=NORB
Does not include IRB nor SRB entries in the VTAM internal trace.

You can change the value of PSSTRACE with the MODIFY VTAMOPTS command while VTAM is running.