IBM ATM OC-3c manual Using LEDs, LED Name Color/State Indicates

D-2APPENDIX D: TROUBLESHOOTING

Using LEDs

Table D-1 describes the LEDs on the Switch, and Table D-2 describes the LEDs on the ATM Module.

Table D-1LEDs on the Switch

LED Name	Color/State	Indicates
MGMT	Green	Switch and ATM Module are
(On the front of		operating normally.
the Switch)	Green	Switch or ATM Module is either
	flashing	downloading software or initializing,
		(which includes a Power On Self Test).
	Yellow	Switch has failed its Power On Self
		Test (POST)
	Yellow	ATM Module failed its Power On Self
	flashing	Test (POST).
	OFF	No power to the Switch.
Module	Green	ATM port enabled; link present.
(On the front of	Green	ATM port disabled; link present.
the Switch)
	flashing
	Green	This LED will flash until all configured
	(long on,	LECs have successfully joined their
	short off)	ELANs.
	Yellow	ATM agent software is not installed
		correctly, or the ATM Module has
		failed its POST (if the MGMT LED is
		flashing yellow).
	Yellow	Switch has not recognized the ATM
	flashing	Module.
	OFF	The ATM Module is not installed, or a
		link is not present on the ATM port,
		or the ATM Switch is not on.

Table D-2LEDs on the ATM Module

LED Name	Color/State	Indicates
Far End Status	Green	The ATM Switch has not
(On ATM Module)		detected an error on the ATM
		Module’s transmit link.
	OFF	The ATM Switch at the far end
		of the connection has detected a
	(and Link	problem with the ATM Module’s
	Status LED is	transmit connection, and
	Green)	notified the ATM Module. For
		example, the transmit half of the
		ATM Module’s cable has been
		disconnected at either the ATM
		Module end or ATM Switch end
		of the connection.
	OFF	The cable between the ATM
		Module and ATM Switch has
	(and Link	been disconnected.
	Status LED is
	OFF)
Link Status	Green	A link is present on the ATM
(On ATM Module)		port, and the port is receiving
		valid SONET frames.
	OFF	The Link is not present on the
		ATM Port.
TX	Yellow	The ATM port is transmitting
(On ATM Module)		Ethernet, LANE, Signalling or
		control frames.
	OFF	The ATM port is not transmitting
		cells.
RX	Yellow	The ATM port is receiving data
(On ATM Module)		cells.
	OFF	The ATM port is not receiving
		incoming cells.