Phantom First Failure Support Technology™ (PFFST) captures information about a potential problem when it occurs if FFST™ is not installed or active. See z/OS Information Roadmap to determine what document contains more information about FFST.
See z/OS Communications Server: SNA Diagnosis Vol 1, Techniques and Procedures for information about other dumps that can be used for problem determination of the VTAM® program or CSM.
When a problem is detected, a software probe is triggered by VTAM or CSM. If FFST is not installed or active, then PFFST collects information about the problem and generates output to help solve the problem.