B-3
Cisco 3200 Series Router Hardware Reference
OL-5816-10
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 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).
Step 10 Align the SFP module in front of the slot opening.
Step 11 Insert the SFP module into the slot until you feel the connector on the module snap into place in the back
of the slot.
Step 12 Remove the dust plugs from the SFP module optical ports. Store the plugs for later use.
Caution 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.
Step 13 Clean the fiber-optic connectors by using standard procedures.
Step 14 Insert the LC cable connector into the SFP module.
Step 15 Verify that the gasket is in place and replace the Antenna end cap by using a 3/8-in. wrench to remove
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:
• Poor performance
• No connectivity
• Corrupted software
Table B-1 describes how to detect and resolve these problems.
Tab l e B-1 Common SFP Problems
Symptom Possible Cause Resolution
Poor performance or
excessive errors
Cabling distance exceeded.
Port statistics show excessive frame
check sequence (FCS),
late-collision, or alignment errors.
Reduce the cable length to within the
recommended distances.
See your SFP module documentation
for cabling guidelines.
No connectivity Incorrect or bad cable
The cable is wired incorrectly.
STP checking for possible loops.
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.