Why is the corresponding Ethernet port indicator light on the device not on when the Ethernet port is normal?

If the indicator light is not damaged, if the front panel of the device has a port status indicator mode switch button (MODE button), the following possibilities are available:

The equipment is a PoE model

¡When the port mode indicator light flashes green, the port of the device is in PoE mode. In this mode, if the PoE function of the device port is not enabled, the port indicator light is not on.

¡When the port mode indicator is flashing yellow, the port of the device is in IRF mode. In this mode, the port status indicator is always on green to indicate the member number of the device, and other lights are off.

Equipment is a non-PoE model

¡When the port mode indicator is flashing yellow, the port of the device is in IRF mode. In this mode, the port status indicator is always on green to indicate the member number of the device, and other lights are off.