This reports the current operational state of this physical port, up, down, or testing, as actually observed by the switch, as opposed to what was administratively requested. A port where pportAdminStatus is up but pportOperStatus reports down indicates a real fault, such as a bad cable, loss of signal, or far-end problem, on this specific port rather than an intentional shutdown. Polling pportOperStatus and seeing it flap between up and down every few minutes on one port would point to a marginal physical connection on that link.