Installation guide

18-24
Cisco 10000 Series Routers Line Card Hardware Installation Guide
OL-6773-04
Chapter 18 Troubleshooting the Installation
Cleaning the Fiber-Optic Connections
Cleaning the Fiber-Optic Connections
For information about cleaning fiber-optic cable connectors and receptacles, see the Inspection and
Cleaning Procedures for Fiber-Optic Connections document and the Compressed Air Cleaning Issues for
Fiber-Optic Connections
for more information on cleaning optical devices.
The Inspection and Cleaning Procedures for Fiber-Optic Connections document provides detailed
illustrations and photos of procedures and equipment required to properly clean fiber-optic connections.
Checking Flow Control
Each line card sends egress flowbits back to the PRE. The bus interface frame contains 64,000 flowbit
opportunities. If there is service degradation on a line card, use the show pxf cpu queue command to
display flowbit information. The command output includes the Flowbit(period/offset) field. The period
output indicates how often the flowbits repeat themselves within the frame. The offset output indicates
how to find the flowbit pertaining to a particular interface on that line card.
The FAIL LED never turns
off after the line card has
been inserted. (The line card
is not coming up out of
reset.)
The line card is not properly seated. Be sure the ejector levers are closed and the
captive screws tightened.
Bad line card connector or bad backplane
connector.
1. Carefully check both the line card backplane
connector and chassis backplane connector
for bent or damaged pins. If the line card has
damaged pins, replace the line card. If the
backplane connector has damaged pins,
replace the chassis or temporarily move the
line card to another slot.
2. Remove the line card and put it in another
chassis slot.
Cisco IOS is configured to hold the card in
reset.
Verify that the slot is not being held in reset by the
Cisco IOS configuration.
Defective line card. Replace the line card.
With the BNC cable
connected and the line card
configured under Cisco IOS,
the CARRIER LED does not
illuminate.
The cable is not seated correctly. Unplug and replug the cable.
The cable is plugged in backward. Verify that the transmit of the far end is plugged
into the receive of the Cisco 10000 equipment and
vice versa.
The equipment at the far end of the cable
is not operational.
Verify that the far end is enabled and actively
sending a signal down the cable.
The 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 cable.
Defective line card. Replace the line card.
Table 18-6 Unchannelized E3/T3 Line Card Troubleshooting Information (continued)
Symptom Possible Cause Corrective Action