3Com 2924-PWR manual LED Status, Indicators, Describes the meanings of the LEDs

16CHAPTER 1: GETTING STARTED

LED Status	The 2924-PWR SFP Plus 24-Port Ethernet switch provides LED indicators
Indicators	on the front panel for your convenience to monitor the switch. Table 2
	describes the meanings of the LEDs.
	Table 2 Description on the LEDs of the Switch 2924-PWR

LED	Label	Status	Description
Power	Power	Green	The switch starts normally. The LED flashes
			when the system is performing power-on self
			test (POST).
		Yellow	The system has failed the POST.
		OFF	The switch is powered off.
10/100/1000	Link/	Green	The port works at the rate of 1000 Mbps; the
BASE-T	Activity		LED flashes quickly when the port is sending
Ethernet port			or receiving data.
status
		Yellow	The port works at the rate of 10/100 Mbps;
			the LED flashes quickly when the port is
			sending or receiving data.
		OFF	The port is not connected.
Duplex mode	Duplex	Yellow	The port is in full duplex mode.
		OFF	The port is not connected, or is in half duplex
			mode.
1000Base SFP	SFP	Green	The SFP module is inserted.
port status	Module
		OFF	The SFP module is not inserted or is not
	Active
			recognized.
PoE status	PoE	Green	Delivering power. The LED flashes if a fault
	Status		occurs.
		OFF	Not delivering power.