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C2653M (6/07) 19
100BASE-FX Status LED ( ) (Continued)
Red Ethernet link
is down.
NOTE: In addition to a red 100BASE-FX
Status LED, the Optic Fault LED is green or
flashing red and the left RJ-45 Port Status
LED (Link/Activity) is not lit.
A link-down detection condition exists due to
any of the following fault conditions:
• Laser fault (Optic Fault LED is flashing red)
• 10BASE-T/100BASE-TX port on the
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
on the module
– Problem with external equipment
connected to the 10BASE-T/
100BASE-TX port
NOTE: A red 100BASE-FX Status LED
provides a far-end fault indication (FEFI) when
the remote fiber port cannot detect receipt of
an optical signal (Optic Fault LED on the
remote module is red). Due to link-down
detection, however, the 100BASE-FX Status
LED lights red regardless of whether the fault
is due to the failure of a 100BASE-FX transmit
link or a 10BASE-T/100BASE-TX link.
Do any of the following to
restore the link:
• If a laser fault has
occurred, refer to the
Optic Fault LED section
in this table for
information.
• Check the cable and
external equipment that
connects to the
10BASE-T/100BASE-TX
port on the module. For
additional information,
refer to the RJ-45
10BASE-T/100BASE-TX
Port Status LED - Left
section in this table.
Optic Fault LED ( )
Green The optical
signal is being
received and
laser is oper-
ating properly.
— No action required.
(Continued on next page)
Table B. Troubleshooting with Front-Panel Indicators (Continued)
Indicator
Color Meaning Possible Cause Corrective Action