IBM ATM OC-3c - Manual (Page 96)

D-2 A PPENDIX D: T ROUBLESHOOTING
Using LEDs
Table D-1 describes the LEDs on the Switch, and Table
D-2 describes the LEDs on the ATM Module.
Table D-1 LEDs on the Switch
LED Name Color/State Indicates
MGMT
(On the front of
the Switch) Green
Green
flashing
Yellow
Yellow
flashing
OFF
Switch and ATM Module are
operating normally.
Switch or ATM Module is either
downloading software or initializing,
(which includes a Power On Self Test).
Switch has failed its Power On Self
Test (POST)
ATM Module failed its Power On Self
Test (POST).
No power to the Switch.
Module
(On the front of
the Switch) Green
Green
flashing
Green
(long on,
short off)
Yellow
Yellow
flashing
OFF
ATM port enabled; link present.
ATM port disabled; link present.
This LED will flash until all configured
LECs have successfully joined their
ELANs.
ATM agent software is not installed
correctly, or the ATM Module has
failed its POST (if the MGMT LED is
flashing yellow).
Switch has not recognized the ATM
Module.
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-2 LEDs on the ATM Module
LED Name Color/State Indicates
Far End Status
(On ATM Module) Green
OFF
(and Link
Status LED is
Green)
OFF
(and Link
Status LED is
OFF)
The ATM Switch has not
detected an error on the ATM
Module’s transmit link.
The ATM Switch at the far end
of the connection has detected a
problem with the ATM Module’s
transmit connection, and
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.
The cable between the ATM
Module and ATM Switch has
been disconnected.
Link Status
(On ATM Module) Green
OFF
A link is present on the ATM
port, and the port is receiving
valid SONET frames.
The Link is not present on the
ATM Port.
TX
(On ATM Module) Yellow
OFF
The ATM port is transmitting
Ethernet, LANE, Signalling or
control frames.
The ATM port is not transmitting
cells.
RX
(On ATM Module) Yellow
OFF
The ATM port is receiving data
cells.
The ATM port is not receiving
incoming cells.