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Cisco 4400 Series Wireless LAN Controllers

Field Notice: FN - 63258 - WLC 44xx Potential Power Failure

Field Notice: FN - 63258 - WLC 44xx Potential Power Failure

Revised October 6, 2010

October 6, 2009


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 Date Comment
1.1
28-SEP-2010
Removed UMPIRE Program and updated Workaround/Solution section.
1.0
06-OCT-2009
Initial Public Release.

Products Affected

Products Affected
AIR-WLC4402-12-K9
AIR-WLC4402-25-K9
AIR-WLC4402-50-K9
AIR-WLC4404-100-K9

Problem Description

Cisco has observed that certain identified serial numbers of WLC 4400 series controllers may fail to boot on a subsequent power cycle.

Background

Few 4400 series controllers that are built between November 2008 and March 2009 have experienced lower test during power cycles due to a bad part. Based on analysis performed by Cisco and the component supplier, we have found that only three percent of the total identified units are built during that period may fail over the life of the product if the product is power cycled frequently. The actual failure rate in the field in the last six months has been less than one percent.

As of April 14th, new products that were manufactured under deviation D102201 or D102319 are free of this problem.

Refer to "How to Identify Hardware Levels" below for instructions on how to view the deviation number of in-service product.

Problem Symptoms

A small number of controllers that are identified by serial numbers may fail with symptom: "No Power".

Workaround/Solution

1.If a unit with a redundant power supply fails, then the system will automatically revert to the backup. The unit will function properly without any problems.

2.If a unit with a single power supply fails, then the power supply can be removed from that slot and replaced in the other slot. The unit should boot up and function properly.
For instructions on changing power supply slot, refer to "Quick Start Guide: Power Supplies for Cisco 4400 Series WLAN Controllers" (Text Part Number: 78-17159-03).


If a customer has a unit with an impacted serial number and they have not experienced a power supply failure, we recommend the customer continue to use the unit. Because the likelihood of a failure is low Cisco recommends a "Fix on Failure" approach. (The UMPIRE Program for the affected units in place is complete. Please follow Standard Cisco RMA process if the user encounter this issue with a suspected unit.)

Use the linked Serial Validation Tool to verify if these products are affects:

  • AIR-WLC4402-12-K9
  • AIR-WLC4402-25-K9
  • AIR-WLC4402-50-K9
  • AIR-WLC4404-100-K9

    Note: Products that fall within the affected serial number range are NOT affected by this problem if they have Deviation label D102201 or D102319 applied.

How To Identify Hardware Levels

Top assembly number (TAN) is the same for all impacted units. Serial number is on the front of the bezel.

Deviation

Deviations D102201 and D102319 indicate that the product has been reworked and is not impacted by this notice.

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:

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