3Com 3C16491 manual Link/Activity Status LEDs

12INTRODUCING THE BASELINE SWITCH

(3) Link/Activity Status LEDs

The first (top) and third row of LEDs, which are colored yellow or green, show the link, activity and speed status of the related ports:

10/100/1000BASE-T Ports

Status	Meaning
Green	The link is operating at 1000 Mbps.
Yellow	The link is operating at 10 or 100 Mbps.
Flashing	Packets are being received or transmitted on the
Green	port at 1000 Mbps.
Flashing	Packets are being received or transmitted on the
Yellow	port at 10 or 100 Mbps.
Off	The link has not been established, either nothing
	is connected to the port, or there is a problem:
	■	Check that the attached device is powered
		on.
	■	Check that the cable or fiber is the correct
		type and is not faulty.
	■	For fiber connections, ensure that the receive
		(RX) and transmit (TX) cable connectors are
		not swapped.

If these checks do not identify the cause of the problem, it may be that the unit or the device connected to the port is faulty. Contact your supplier for further advice.

10/100BASE-TX Ports

Status	Meaning
Green	The link is operating at 100 Mbps.
Yellow	The link is operating at 10 Mbps.
Flashing	Packets are being received or transmitted on the
Green	port at 100 Mbps.
Flashing	Packets are being received or transmitted on the
Yellow	port at 10 Mbps.
Off	The link has not been established, either nothing
	is connected to the port, or there is a problem:

■Check that the attached device is powered on.

■Check that the cable or fiber is the correct type and is not faulty.

■For fiber connections, ensure that the receive (RX) and transmit (TX) cable connectors are not swapped.

If these checks do not identify the cause of the problem, it may be that the unit or the device connected to the port is faulty. Contact your supplier for further advice.

(4) Duplex Status LEDs

The second and fourth (bottom) row of Status LEDs, which are colored yellow (for duplex) or green (for module active), show the duplex status of the related ports: