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Cisco ONS 15300 Series

Field Notice: *Expired* FN - 27876 - ONG ONS 15327 - False NE Power Failure Alarm


Revised June 4, 2008
December 29, 2003


NOTICE:

THIS FIELD NOTICE HAS BEEN EXPIRED AND IS NO LONGER MAINTAINED OR UPDATED BY CISCO.

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


Products Affected

Product Top Assembly Comments HW Rev.
Part Number Rev.
15327-MIC-A-T   800-23601-01   B0   Mechanical Interface Card, A-side, 3 DS3 Rx, 1-15 DS1�fs, ITEMP   B0  
15327-MIC-A-T=   800-23601-01   B0   Mechanical Interface Card, A-side, 3 DS3 Rx, 1-15 DS1�fs, ITEMP   B0  
15327-MIC-B-T   800-23602-01   B0   Mechanical Interface Card, B-side, 3 DS3 Tx, 16-28 DS1�fs, ITEMP   B0  
15327-MIC-B-T=   800-23602-01   B0   Mechanical Interface Card, B-side, 3 DS3 Tx, 16-28 DS1�fs, ITEMP   B0  

Problem Description

Cisco ONS 15327 nodes may incorrectly indicate an �gNE Power Failure at Connector A or B? alarm.
NOTE: This false alarm indication is not service affecting as there is no actual loss of power.

Sample Exported Data from Cisco Transport Controller (CTC) - Alarms -


 

Background

Each Management Interface Connector (MIC) has an input voltage monitoring circuit that drives an associated alarm signal to the Cross Connect, Timing and Control (XTC). The alarm signal is cleared when input voltage is within the acceptable operating limits and raised when the input voltage is outside the acceptable operating limits.
On affected MICs, component tolerance variances may cause the input voltage monitoring circuit to incorrectly raise the power loss alarm. In order to correct this condition, a component change is being made to the power loss alarm driver circuitry located on each MIC. This minor change will filter false power loss alarming without affecting the reporting of legitimate MIC input voltage alarm conditions.
 

Problem Symptoms

ONS 15327 nodes may indicate an �gNE Power Failure at Connector A or B? alarm in the Cisco Transport Controller (CTC) or Cisco Transport Manager (CTM) . Additionally, the PWR A and/or PWR B LED indicators located on the XTC may indicate an alarm condition by glowing Red or Yellow. For the majority of cases the false power fail alarms will be raised and cleared intermittently. However, in some cases it is possible for the false power loss alarms to persist.  

Workaround/Solution

Customers seeing this false alarm should request a replacement RMA of the above referenced products.
Additionally customers running software version 3.3.x on their ONS 15327 may see software caveat # CSCeb05404 which may not allow these false power loss alarms to automatically clear. See Release Notes for software version 3.3.x and view DDTS #CSCeb05404 for the details and workaround procedure.

How To Identify Hardware Levels

Customers may utilize CTC or CTM to view card 800-level product number and revision information. They may also note this information physically indicated on the card itself.  

For More Information