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C2653M (6/07) 23
RJ-45 10BASE-T/100BASE-TX Port Status LED - Left (Link/Activity) (Continued)
Not lit Ethernet link
is down.
A link-down detection condition
exists due to any of the following
fault conditions:
• 10BASE-T/100BASE-TX fault
on local module (Optic Fault
LED is green or blinking red
and 100BASE-FX Status LED is
red)
or
10BASE-T/100BASE-TX fault
on remote module (Optic Fault
LED is red and 100BASE-FX
Status LED is not lit on local
module):
– Disconnected or defective
Category 5e (or higher)
cable
– Cable is not the proper
type.
– Cable is not the proper
length.
– Defective 10BASE-T/
100BASE-TX port
– Problem with external
equipment connected to
the 10BASE-T/
100BASE-TX port
– Duplex mode setting (half-
duplex or full-duplex) does
not match the duplex mode
setting of the remote
module.
• 100BASE-FX port on the
module does not transmit or
receive optical signal (Optic
Fault LED is red and
100BASE-FX Status LED is not
lit).
Do any of the following to restore the
link:
• Check the cable that connects to the
10BASE-T/100BASE-TX port on the
module:
– If the cable is disconnected from
the module or from the
10BASE-T/100BASE-TX compati-
ble device, connect the cable.
– If the cable is defective, replace
the cable. Use Category 5e or
higher cable.
– Ensure that the cable is the
proper length. Cable length must
not exceed 128 feet (100 meters).
– Replace the module if the
10BASE-T/100BASE-TX port is
defective.
• Check the external equipment that
connects to the 10BASE-T/
100BASE-TX port on the module.
Ensure that the equipment is
powered on.
• Set the duplex mode setting on
modules to match one another (auto-
negotiation or forced half-duplex or
full-duplex). Refer to the Setting
10BASE-T/100BASE-TX Port Modes
of Operation section in this manual
for information.
• Refer to the Optic Fault LED and
100BASE-FX Status LED sections in
this table to troubleshoot
100BASE-FX fault conditions.
(Continued on next page)
Table C. Troubleshooting with Rear-Panel Indicators (Continued)
Indicator
Color Meaning Possible Cause Corrective Action