Installation guide

18-4
Cisco 10000 Series Routers Line Card Hardware Installation Guide
OL-6773-04
Chapter 18 Troubleshooting the Installation
ATM Line Card Troubleshooting Information
With the optical fiber cable
connected and the line card
configured under Cisco IOS,
the CARRIER LED does not
illuminate.
The optical fiber cable is not
seated correctly.
Unplug and replug the optical
fiber cable.
Y—Y
The optical fiber cable is plugged
in backwards.
Verify that the transmit of the far
end is plugged into the receive of
the Cisco 10000 equipment and
vice versa.
The optical fiber cable is dirty. Clean the optical fiber cable on
both ends. See the “Cleaning the
Fiber-Optic Connections” section
on page 18-24.
The equipment at the far end of
the optical fiber cable is not
operational.
Verify that the far end is enabled
and actively sending a signal
down the optical fiber cable.
The optical fiber cable is the
incorrect type.
Use the correct type of the optical
fiber cable for the line card.
Far-end optics do not match the
line card optics.
Make sure the far-end optics
match the line card optics.
The optical fiber cable is too long. If the optical fiber cable being
used is longer than the standards
allow, use a standards-compliant
length of optical fiber cable for
the line card.
The optical fiber cable is too
short.
If the optical fiber cable is too
short, the optical receiver can be
overpowered. Use an attenuator
or a longer optical fiber cable to
adjust the optical power seen at
the Cisco 10000 line card. Be sure
to calculate the optical power
budget.
The optical fiber cable is broken. As an experiment to isolate the
failure, use a small loopback
cable to connect the Cisco 10000
line card to itself. If the LED
lights under this condition,
continue to investigate cable or
far-end equipment failure. Try
replacing the optical fiber cable.
Defective. line card. Replace the line card.
Table 18-1 ATM Line Card Troubleshooting Information (continued)
Symptom Possible Cause Corrective Action
OC-3/
STM-1
ATM
E3/
DS3
ATM
OC-12
ATM