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Cisco ONS 15600 Series

Field Notice: FN - 62013 - ONS 15600-192L4LR1550 - False Laser Bias Current Alarm


June 30, 2005


Products Affected

  • 15600 - 15600-192L4LR1550

  • 15600 - 15600-192L4LR1550=

Serial Numbers

Random #

CNH080400UF
CNH080400UG
CNH080400UR
CNH080400US
CNH080400UT
CNH080600HQ
CNH08290001
CNH08290003
CNH08290005
CNH08290007
SAG06483H20
SAG06483H23
SAG06483H25
SAG06483H26
SAG06483H28
SAG06483H2D
SAG06483H2F
SAG07056QFX
SAG07056QFY
SAG07056QG1
SAG07056QG3
SAG07056QG5
SAG07076ZBJ
SAG07076ZY9
SAG07076ZYA
SAG07076ZYE
SAG07147X5A
SAG07147X5H
SAG07198MJ0
SAG07198MJC
SAG07198MJG
SAG07198MJH
SAG07198MJK
SAG07198MJM
SAG07198MJP
SAG07198MJQ
SAG07198MJU 

Problem Description

The calibration data for the 10G optical module was not correctly written to the EEPROM on the board.

Background

Certain OC192-LR modules require a longer period of time when reading the EEPROM data in the optical module. If an adequate amount of time is not provided the module may periodically not allow the Vendor ID to be read. If this should occur, the calibration station will identify the vendor as ?UNKNOWN?.

When the Vendor ID is ?UNKNOWN? incorrect resistor values are used for calibration. When this occurs, the calculation for the Laser Bias Current will be incorrectly calculated and the system software will read a value of infinity. The systems interpretation of infinity will vary and will periodically raise a Laser Bias Current High alarm incorrectly.

The calibration test station has been upgraded to provide the necessary time period to allow the data to be properly read.

Problem Symptoms

Customer will see a Laser Bias Current alarm. Traffic is not affected.

Workaround/Solution

It is possible for the Cisco TAC to correct the calibration data while the board is in service. Customers affected by this issue should contact the TAC who will follow the appropriate process (EDCS-435742)to correct the issue.

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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