This Counter32 is a free-running, cumulative tally of PCIe completion timeouts recorded against this PCIe endpoint's completion-handling logic since the counter was last reset by a reboot or reseat; concretely, a requester (the PCIe root complex or adapter) never received a completion for an outstanding transaction within the PCIe timeout window. Because it never wraps back to zero on its own, an admin uses it as the lifetime baseline against which the 15-minute/hourly/daily/weekly gauges on this same row are compared to spot fresh activity. A blade that shipped with this counter at 0 and now reads 187 has accumulated 187 such faults since it was last powered up, which on a healthy riser should stay at 0.