Diagnosing Sfp Problems - Cisco 3200 Series Hardware Reference Manual

Appendix B SFP Module Replacement
Step 9 Find the send (TX) and receive (RX) markings that identify the top side of the replacement SFP module.
Note
Align the SFP module in front of the slot opening.
Step 10
Insert the SFP module into the slot until you feel the connector on the module snap into place in the back
Step 11
of the slot.
Remove the dust plugs from the SFP module optical ports. Store the plugs for later use.
Step 12
Caution
Clean the fiber-optic connectors by using standard procedures.
Step 13
Insert the LC cable connector into the SFP module.
Step 14
Verify that the gasket is in place and replace the Antenna end cap by using a 3/8-in. wrench to remove
Step 15
the bolts, torquing the bolts to 58 to 68 inch-pounds.

Diagnosing SFP Problems

You can get statistics from the browser interface, from the CLI, or from an SNMP workstation.
Common SFP module problems fall into these categories:
•
•
•
Table B-1
Table B-1
Symptom
Poor performance or
excessive errors
No connectivity
OL-5816-10
On some SFP modules, the send and receive (TX and RX) markings might be replaced by arrows
that show the direction of the connection, either send or receive (TX or RX).
Do not remove the dust plugs from the SFP module port or the rubber caps from the fiber-optic
cable until you are ready to connect the cable. The plugs and caps protect the SFP module
ports and cables from contamination and ambient light.
Poor performance
No connectivity
Corrupted software
describes how to detect and resolve these problems.
Common SFP Problems
Possible Cause
Cabling distance exceeded.
Port statistics show excessive frame
check sequence (FCS),
late-collision, or alignment errors.
Incorrect or bad cable
The cable is wired incorrectly.
STP checking for possible loops.
Resolution
Reduce the cable length to within the
recommended distances.
See your SFP module documentation
for cabling guidelines.
Verify the pinouts are correct for the
proper application of cables.
Replace the cable with a tested good
cable.
Wait 30 seconds for the port LED to
turn green.
Cisco 3200 Series Router Hardware Reference
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