Field Notice: FN74189 - A Limited Number of CIM8-C-K9 Units May Experience Small, Random, Uncorrected Errors on Both Network and Client Interfaces - Hardware Upgrade Available

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Updated:February 6, 2025
Document ID:FN74189

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High
Impact Rating:
High
First Published:
2024-Oct-09
Last Published:
2025-Feb-06
Revision:
2.0
Cisco Bug IDs:

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.

Products Affected


Affected Product Name Description Comments
CIM8-C-K9 Coherent Interface Module 8 C-Band  
CIM8-C-K9= Coherent Interface Module 8 C-Band  




Defect Information


Defect IDHeadline
CSCwi74008CIM8 defects requiring Jannu silicon B0 to be fixed

Problem Description


A limited number of Cisco Coherent Interconnect Module 8 (CIM8-C) Modules that use a digital signal processor (DSP) that may experience small, random, uncorrected errors. For information about which Cisco CIM8-C products are affected, see the Products Affected section of this field notice.


Background


Due to timing violations, a limited number of DSPs may report Line Rx post-forward error correction (FEC) errors and ingress and egress client traffic corruption, resulting in uncorrectable post-FEC block errors even though there is a positive Q margin. Errors may be flagged by a remote monitoring (RMON) or performance monitoring (PM) counter and/or may only be detectable by a connected router. It is also possible to have valid traffic but incorrect RMON and PM reporting.


Problem Symptom


Affected units may show uncorrected errors at random during operation.


Workaround/Solution


Cisco recommends replacing affected units with the new version. To determine if a serial number is affected, see the Serial Number Validation section of this field notice.


How to Identify Affected Products


In order to verify if your product is affected by this issue, use the Cisco Support Assistant (CSA) to validate the serial number for your device(s). The serial number for the affected device(s) should be included in the form in this field notice.


Serial Number Validation


The Cisco Support Assistant (CSA) can help verify whether a device is impacted by the issue that is described in this Field Notice. To check the device, either enter the serial number in the CSA on the right side of this page or click the following URL: https://cs.co/FNSNV.

Revision History


VersionDescriptionSectionDate
2.0Changed field notice distribution from Internal to External.—2025-FEB-06
1.0Initial Release—2024-OCT-09

For More Information

For further assistance or for more information about this field notice, contact the Cisco Technical Assistance Center (TAC) using one of the following methods:

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