Cisco ONS 15400 Series

Revised January 21, 2009
September 23, 2008

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
1.3	21-JAN-2009	Updated Background section and added PCN.
1.2	10-DEC-2008	Updated Products Affected table.
1.1	05-DEC-2008	Added Serial Number Validation Tool link to How to Identify Hardware Levels section, added additional information and clarification to all other sections except Products Affected.
1.0	23-SEP-2008	Initial Public Release

Products Affected

Problem Description

If a sufficient voltage difference between batteries exist, cards could reset. Two elements required to cause this event are:

- Card has a Maxim (MAX5948AESA) INRUSH Current controller populated

- Relative Voltage differential between (A/B) voltage source is > 4V and one battery is removed/installed.

- Other triggering events of the card reboot with improper removal alarm generation are surges and high speed voltage transient on the power supply rail.

Background

This field notice is being issued to aid in diagnosing field events only. If there is maintenance work on the power to a node, and cards reset, this FN may be used to check the card serial numbers to confirm the root cause for reset. No recall or replacement of hardware is required.

The INRUSH current controller 15-3713-01 has two Qualified vendors, Maxim (MAX5948AESA) and Linear-Tech (LT1640LIS8).
On cards populating with the MAX5948AESA and subject to sufficient voltage delta between batteries (> 4V), the cards could reset when a battery is removed/installed.

Problem Symptoms

The problem symptom includes experiencing a card reboot while BATTERY A/B is being removed/installed, or when a pulse surge or a high speed voltage transient is applied to the input power.

Workaround/Solution

Ensure that there is a < 4Vdc difference between BatA and BatB when reconnecting either BatA or BatB to the chassis. When possible, use maintenance windows to work on the system to upgrade the node with system card replacements.

How To Identify Hardware Levels

All hardware potentially impacted by this issue is listed by part number and serial number in this field notice. To determine the part and serial number of your affected hardware:

Open Cisco Transport Controller, or Cisco Transport Manager:
From the Shelf View, select Inventory
From the Inventory tab, locate the potentially effected cards and compare the information from the Inventory tab against the Products Affected section.

If you are using TL1 commands.
1. >ACT-USER::
2. >RTRV-INV::ALL
3. >CANC-USER::

Compare the information from the TL1 inventory command against the products affected section above.
The serial number of the hardware can also be checked against the serial number validation tool here:

Click here for Serial Number Validation Tool

PCN

E093148

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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