38LED Status DescriptionSteady red POST has failed.Flashing yellow (1Hz) Some ports have failed to pass POST.Off The switch is powered off.Port mode LEDThe port mode LED indicates the type of information that the port LEDs are showing.You can use the port LED mode switching button to change the type of displayed port information.Table 12 Port mode LED descriptionLED Status DescriptionSteady green The port LEDs are showing port rates.ModeSteady yellow The port LEDs are showing duplex modes.Seven-segment LEDThe seven-segment LED, together with the system status LED, shows detailed system operating information(see Seven-segment LED description (I)).Table 13 Seven-segment LED description (I)StatusLED System statusLED (SYS) Seven-segment (Unit) LEDDescriptionFlashing greenThe LED displays numbers one byone. POST is running, and the LEDdisplays the ongoing test item ID.Flashing redThe LED displays flashing numbers. POST has failed, and the LEDflashes the ID of the failed test item.Flashing greenA bar rotates clockwise around theLED.Software is loading.Steady redThe LED displays a flashing Fcharacter. The switch is experiencing a fanfailure.UnitSteady redThe LED displays a flashing tcharacter. The switch is in an over-temperaturecondition.