48Status DescriptionPort mode LED Ethernet port status LEDFlashing green (1 Hz) (PoE mode,supported by S5120-28C-PWR-EIand S5120-52C-PWR-EI only)Steady green PoE power supply is normal.Flashing green (1 Hz)The device attached to the portrequires power higher than themaximum or currently available PoEoutput power on the port.Steady yellowThe port is experiencing a PoEfailure.The devices attached to the port arenot powered devices (PDs), so theport does not supply power.Flashing yellow (3 Hz) POST has failed on the port.Off The port is not supplying PoEpower.Steady yellow (duplex mode)Steady greenThe port is operating in full duplexmode. The port status LED fastflashes when the port is sending orreceiving data.Steady yellowThe port is operating in half duplexmode. The port status LED fastflashes when the port is sending orreceiving data.Flashing yellow (3 Hz) POST has failed on the port.Off No link is present on the port.SFP port status LEDEach 1000Base-X SFP port has a status LED to show port operating status and activities. The port modeLED shows the type of port status information that the port status LEDs are showing.Table 19 SFP port status LEDs descriptionStatus DescriptionPort mode LED Ethernet port status LEDSteady green (rate mode) orflashing green (1 Hz, PoE mode)Steady greenThe port is operating at 1000 Mbps.The port status LED fast flashes whenthe port is sending or receiving data.Flashing yellow (3 Hz) POST has failed on the port.Off No link is present on the port.