Requirements for receiving performance data

Performance data can be requested and received using the performance monitor interface. This interface involves two-way communication between VTAM® and the monitor as follows:

Monitor to VTAM
The monitor sends data collection requests to VTAM over the CNM interface.

The monitor sends requests to VTAM over the program operator interface to modify an installation-wide performance monitor exit (ISTEXCPM) associated with the monitor.
VTAM to monitor
VTAM reports data to the performance monitor exit, which forwards this data to the monitor.