Counts path failure events on this SONET port, where a path failure is an AIS-P (path alarm indication signal) received from another network element, generated internally, or - on paths supporting ERDI-P - an UNEQ-P (unequipped path) failure. Because this tracks path-layer problems separately from the line-layer failures in eqSonetStatsLineFailures, admins use it to pinpoint whether an outage originates at the path (end-to-end circuit) level versus the physical line level. A path showing eqSonetStatsPathFailures increasing while eqSonetStatsLineFailures stays at zero would point an admin toward a path provisioning or far-end termination issue rather than a physical line problem.