Field Notice: FN - 63046 - CRS - 1OC768-POS-SR Cards May Experience Bit Error Rate (BER) Incidents Due to Onboard Short - 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

Products Affected

Defect Information

Problem Description

OC768 cards operating on the CRS-1 chassis may encounter intermittent burst BER events several months after installation due to dendrite growth. A dendrite is a crystal with a tree-like branching structure that is formed when a metal, or an alloy of multiple metals, in liquid form freezes. Packaging contamination can allow molding compounds to absorb moisture through the package body and between the lead frame molding compound interface causing dendrite formation. Combined with moisture, this results in a lowering of resistance between tracks and pads and can lead to metal corrosion.

Background

Contamination resulting from the assembly process or materials used in the packaging of the OC768 Mux and Demux chips may result in corrosion and dendrite growth occurring on some in-package capacitors. The corrosion products and/or growth of these dendrites will eventually cause long-term reliability issues for the device. Failure is gradual and very dependant on the environment with time and temperature as accelerators.

Problem Symptom

The end-user may initially experience intermittent BER bursts. This will be followed by more frequent BER bursts. Further deterioration will result in a TXOOA (transmit out of alignment) error flag which can be manually cleared. Eventually the interface reaches a state of "frame lock asserted" and is unable to transmit traffic from the interface.

Workaround/Solution

Cisco recommends replacing the affected hardware (1OC768-POS-SR). Although a replacement program was available in past is now closed. Follow Cisco RMA process to request replacement and indicate AFN and FN63046.

As of approximately 22Feb2008 new products that were manufactured under Engineering Change Order E092422 and Deviation Number D094933 are free of this problem. Please refer to the "How to Identify Affected Products" section below for instructions on how to view the version and deviation of in-service product.

Note: Proactive Replacements fulfilled through the recall process typically take 2-3 weeks. Normal service level agreements do not apply to replacements obtained using the upgrade form. For network down severity one Service Requests in need of single unit replacements, one can make NBD (Next Business Day) requests in the NOTES field below. Products that fall within the sited serial number range are NOT affected by this problem if they have ECO E092422 and Deviation D094933 applied.

How To Identify Affected Products

1. Check the 1OC768-POS-SR by using the show diag command below. If the TAN is higher than 800-16968-04, the 1OC768-POS-SR has been upgraded and does NOT need replacing. No further checks are necessary.
2. Check the Deviation Number by using the show diag command below. If the Deviation number is D094933, the 1OC768-POS-SR has already been reworked and does NOT need replacing, and no further checks are necessary. If the deviation is N/A as in the output below, proceed to step three.
3. If the TAN is 800-16968-04 or lower, check all suspect board using SN Validation tool. If a serial number is found in the list as 'Affected', then replace the 1OC768-POS-SR. using the Cisco RMA process and refer to this FN.

   Execute the show diag command as seen below to check the 800 TAN number and deviation number.

   PLIM 0/3/CPU0 : Cisco CRS-1 Series 1xOC768/STM256 POS Interface Module/SR
   MAIN: board type 600083
   800-16968-04 rev B0<------------- TAN # is here
   dev N/A<-------------------- Deviation # is here
   S/N SAD111200CF
   PCA: 73-6893-09 rev B0
   PID: 1OC768-POS-SR<>VID: V03
   CLEI: IPUIA1BRAB
   ECI: 149222
   Board State : IOS XR RUN
   PLD: Motherboard: 0x0025, Processor: 0xdb88, Power: N/A
   MONLIB: QNXFFS Monlib Version 3.1
   ROMMON: Version 1.45(20070517:152402) [CRS-1 ROMMON]
   CPU0: N/A, CPU1: N/A
   SPEED: OSC Speed: 133 Mhz, CPU Speed: 1197 Mhz
   BUS Speed: 133 Mhz, MEM Speed: 133 Mhz
   MEM Size: 2048 Mbytes
   Interface port config: 1 Ports
   Optical reach type: Short Reach (SR)
   Connector type: SC

4. Verify the serial number is affected with the Serial Validation tool.

Additional Information

D094933

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

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