gtpm1m3fTPF V4R1 Migration Guide: 3.1 to 4.1

Activating and Deactivating the PIU Trace Facility

In the TPF 3.1 system, the path information unit (PIU) trace facility was always active for every Systems Network Architecture (SNA) resource. You used the ZNTRP command to start or stop writing the PIU trace table to the real-time tape, or to display the status of the PIU trace facility.

In the TPF 4.1 system, you use the ZNTRP command to activate and deactivate the PIU trace facility. You also use this command to specify which SNA resources you want to trace. See Path Information Unit (PIU) Trace Facility for more information about the PIU trace facility.