SFP Module Replacement

This chapter describes how to replace small-form-factor pluggable (SFP) modules. SFP modules are inserted into the SFP module slot on the Cisco 3270 Rugged Router card. These modules provide the uplink optical interfaces, laser send (TX) and laser receive (RX).

Each SFP must be of the same type as the SFP on the other end of the cable, and the cable must not exceed the stipulated cable length for reliable communications. Figure B-1 shows an SFP module that has a bale-clasp latch.

Replacing SFP Modules into SFP Module Slots

Step 1

Attach an ESD-preventive wrist strap to your wrist and to a bare metal surface on the chassis.

Step 2

Remove the antenna end cap by using a 3/8-in. wrench to loosen the bolts.

Tip

For reattachment, note which cable connector plug is send (TX) and which is receive (RX).

Step 4

Insert a dust plug into the optical ports of the SFP module to keep the optical interfaces clean.

Step 6

Pull the bale-clasp latch out and down to eject the module. If the bale-clasp latch is obstructed and you cannot use your index finger to open it, use a small, flat-blade screwdriver or other long, narrow instrument to open the bale-clasp latch.

Step 7

Grasp the SFP module between your thumb and index finger, and carefully remove it from the module slot.

Step 8

Place the removed SFP module in an antistatic bag or other protective environment.

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 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.

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.

Table 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.
The port is placed in error-disabled state after SFP module is inserted	Bad or non-Cisco-approved SFP module.	Remove the SFP module and replace it with a Cisco-approved module. Use the errdisable recovery cause gbic-invalid global configuration command to verify the port status, and enter a time interval to recover from the error-disable state.
The port is placed in error-disabled state after SFP is inserted	Bad or non-Cisco-approved SFP module.	Remove the SFP module from the switch and replace it with a Cisco-approved module. Use the errdisable recovery cause gbic-invalid global configuration command to verify the port status, and enter a time interval to recover from the error-disable state.
Device does not recognize the SFP module	The SFP module might be installed upside down. The SFP module did not snap into the slot.	Verify that the SFP module is not installed upside down. Remove the SFP module. Inspect for physical damage to the connector, the module, and the module slot. Replace the SFP module with a known good SFP module.
Excessive errors found in port statistics	Bad adapter in attached device or STP checking for possible loops.	Run adapter card diagnostic utility and wait 30 seconds for the port LED to turn green.

Error Messages

Explanation The online insertion and removal (OIR) facility detected a newly inserted transceiver module for the interface specified in the error message.

Explanation An initialization failure occurred for the transceiver module for the interface specified in the error message. This condition could be caused by software, firmware, or hardware problem. As a result of the error, the module is disabled.

Recommended Action Try reseating the module. Hardware replacement should not occur first occurrence. Before requesting hardware replacement, review troubleshooting logs with a technical support representative.

Explanation The transceiver module for the interface specified in the error message could not be identified and may not be compatible with the interface. The transceiver module specified in the error message contains a transceiver code which could not be correctly interpreted. As a result of the error, the module is disabled.

Explanation The transceiver module for the interface specified in the error message is not a Cisco supported module. As a result of the error, the module is disabled. When Cisco determines that a fault or defect can be traced to the use of third-party transceivers installed by a customer or reseller, then, at Cisco's discretion, Cisco may withhold support under warranty or a Cisco support program. In the course of providing support for a Cisco networking product Cisco might require that the end user install Cisco transceivers if Cisco determines that removing third-party parts will assist Cisco in diagnosing the cause of a support issue.

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