3Com 4210G manual 1000Base-X SFP Port Status LED, Status Description Port mode Ethernet port

	Status
			Description
Port mode	Ethernet port status
LED	LED
	Steady green	PoE power supply is normal.
Flashing			Power consumption of the device connected to the port
	Flashing green (1 Hz)		exceeds the upper limit of the power supply consumption of
green (1			the port, or the available power of the switch is not enough
Hz) (PoE			for power supply of the port.
mode,
			PoE failure, and power supply failed.
supported
by PoE	Steady yellow		The devices attached to the port are not powered devices
switches			(PDs), so the port does not supply power.
only)
	Flashing yellow (3 Hz)	POST failed on the port.
	Off		The port does not provide PoE power.
	Steady green		The port operates in full-duplex mode; the LED is fast
			flashing when data is being sent and/or received on the port.
Steady
			The port operates in half-duplex mode; the LED is fast
yellow	Steady yellow
			flashing when data is being sent and/or received on the port.
(duplex
mode)	Flashing yellow (3 Hz)	POST failed on the port.
	Off		The port is not up.

1000Base-X SFP Port Status LED

The port mode LED and the SFP port status LED together indicate the SFP port operation status. Refer to Table 1-13 for details.

Table 1-13SFP port status LEDs description

Status
		Description
Port mode	Ethernet port
LED	status LED
Steady green	Steady green	The port operates at a rate of 1000 Mbps; the LED is fast
		flashing when data is being sent and/or received on the port.
(rate mode) or
flashing green	Flashing yellow	POST failed on the port.
(1 Hz, PoE	(3 Hz)
mode)
	Off	The port is not up.
	Steady green	The port operates in full-duplex mode; the LED is fast flashing
		when data is being sent and/or received on the port.
Steady yellow
	Flashing yellow
(duplex mode)		POST failed on the port.
	(3 Hz)
	Off	The port is not up.

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