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20 C2653M (6/07)
Optic Fault LED ( ) (Continued)
Red Ethernet link
is down.
NOTE: In addition to a red Optic Fault LED,
the 100BASE-FX LED and the left RJ-45 Port
Status LED (Link/Activity) LED are not lit.
A link-down detection condition exists due to
any of the following fault conditions:
• 100BASE-FX port does not transmit or
receive optical signal:
– Disconnected or defective fiber optic
cable
– Defective 100BASE-FX port on local or
remote module
– Damaged or dirty fiber optic cable
connectors on local or remote module
– Optical dB losses in the fiber optic
installation exceed the optical power
budget specification stated in the
Specifications section.
– Laser fault on remote module
(Optic Fault LED is flashing red on the
remote module)
– Power not connected to remote
module
• 10BASE-T/100BASE-TX port on the remote
module does not transmit data to or
receive data from the external equipment
connected to it:
– Disconnected or defective Category 5e
(or higher) cable
– Defective 10BASE-T/100BASE-TX port
– Problem with external equipment con-
nected to the 10BASE-T/100BASE-TX
port
For additional information, refer to the
RJ-45 10BASE-T/100BASE-TX Port Status
LED - Left section in this table.
Do any of the following to
restore the link:
• Check the connections
of the fiber optic cable.
If the cable is
disconnected, connect
the cable. If the cable is
defective, replace the
cable.
• Clean, polish, or replace
fiber optic cable con-
nectors as necessary.
• Check for problems
with the fiber optic
installation, for exam-
ple, excessive dB losses
in connectors, splices,
patch panels, cables,
and so on.
• Check power connec-
tion of the remote
module. Replace power
supply if necessary.
• Check the cable and
external equipment that
connects to the
10BASE-T/100BASE-TX
port on the remote
module.
• If the 100BASE-FX port
or 10BASE-T/
100BASE-TX port on the
module is defective,
contact Product
Support.
(Continued on next page)
Table B. Troubleshooting with Front-Panel Indicators (Continued)
Indicator
Color Meaning Possible Cause Corrective Action