Installation guide

18-22
Cisco 10000 Series Routers Line Card Hardware Installation Guide
OL-6773-04
Chapter 18 Troubleshooting the Installation
Packet Over SONET 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.
YYY
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.
The line card is defective. Replace the line card.
Table 18-5 Packet Over SONET Line Card Troubleshooting Information (continued)
Symptom Possible Cause Corrective Action
OC-3/
STM-1
POS
OC-12
POS
OC-48/
STM-16
POS