Field Notice: FN - 70120 - Certain GLC-SX-MMD SFPs Require Replacement due to Potential PCB Dimensional Offset - Replace on Failure

Notice

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.

Revision History

Revision	Publish Date	Comments
1.0	24-Jan-18	Initial Release
1.1	01-Feb-18	The SNV link needs to be updated
1.2	10-Jun-21	Updated the Workaround/Solution Section

Products Affected

Affected Product ID	Comments
GLC-SX-MMD
GLC-SX-MMD=	Part Alternate
GLC-SX-MMD++=

Defect Information

Defect ID	Headline
CSCvh58384	Finisar GLC-SX-MMD gold fingers offset

Problem Description

A limited number of GLC-SX-MMD small form-factor pluggable (SFP) connectors might short-circuit when fully inserted into a switch port. The potentially affected units were produced between the weeks of 1 May 2017 and 4 June 2017.

Background

The issue is the result of a manufacturing defect which affects a very small batch of components and results in a dimensional offset in the PCBA gold fingers.

Problem Symptom

The gold fingers of the pluggable SFP might short-circuit when the affected module is plugged into the switch port. Two possible scenarios could be encountered:

• The I2C communication (2-wire serial interface for serial ID) fails to come up and IDPROM is unpopulated (blank) or the module might be unrecognized and show an error message, such as:

  Router#*Aug 16 04:59:35.027: % PM_SCP-3-TRANSCEIVER_UNSUPPORTED: Unsupported transceiver in LAN port 1/48
  

• The entire SFP module fails to come up as a result of gold fingers short-circuiting and the connector is physically damaged.

Damage might include a visibly charred or singed connector. The risk of thermal damage that spreads beyond the SFP connector and/or the mating connector is mitigated due to the use of flame retardant materials within the product.

Workaround/Solution

Cisco recommends that you replace the GLC-SX-MMD SFPs when the previously mentioned symptoms are observed and the serial number matches using the Serial Number Validation Tool. Refer to the section "How to Identify Affected Products".

Note: There is no workaround for this issue.

Complete these steps in order to inspect the SFPs and avoid any potential damage to the system:

1. Always power down and unplug the linecard before you remove the SFPs.
2. Remove the optical cables connected to the SFPs.
3. Unplug and visually inspect the SFP connector for signs of physical damage. Physical damage might include a charred or singed connector.
4. Place the SFPs in an ESD (anti- static) bag with a label that clearly identifies the failure.
5. Quarantine defective units for shipment back to Cisco.
6. Request a Return Material Authorization (RMA) for Fix on Failure.

Caution: If the SFP is observed to have physical damage (item 3), do not attempt to reinstall the damaged SFP in any product. Quarantine the defective unit. Visually inspect the SFP cage and mating connector for any related damage. If damaged, an RMA should be requested for the individual linecard or for the complete stand-alone switch or router.

How To Identify Affected Products

Complete these steps in order to determine the version and serial number of the product and verify whether the product is affected:

1. Identify the version and serial number of the affected GLC-SX-MMD. Use Method 1 or Method 2 in order to identify the version and serial numbers.

   • Method 1. Visually inspect the physical product label.

     The serial number in the main top label needs to begin with 'FNS'. The version ID (VID) is V01. The Cisco part number (CPN) is 10-2626-01. The side labels have a Common Language Equipment Identifier (CLEI) of WOTRB9VBAA.

     Note: The serial number prefix 'FNS' needs to be verified along with one of the other attributes (V01, CPN, or CLEI).

     See this image:

     

   • Method 2. Find the serial number and version remotely from the switch if the unit is already plugged into the port.

     Enter the show inventory command in order to obtain the serial number and version of the SFP. Refer to this example:

     Router#show inventory
     
     NAME: "Transceiver Gi2/3", DESCR: "SFP Transceiver 1000BaseSX Gi2/3"
     PID: GLC-SX-MMD , VID: V01 , SN: FNS21210RHC

2. Use the Serial Number Validation Tool in order to determine if the SFP module is impacted. If the SFP module is not listed, then no action is needed. If listed, request hardware replacement.

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

• Open a service request on Cisco.com
• By email
• By telephone

Receive Email Notification For New Field Notices

Cisco Notification Service—Set up a profile to receive email updates about reliability, safety, network security, and end-of-sale issues for the Cisco products you specify.