Cisco ONS 15454 Series Multiservice Provisioning Platforms

Field Notice: Cisco ONS 15454: Defective DRAM Causes Software Downloads to Fail

Updated August 9, 2000

June 16, 2000

Products Affected



Cisco ONS 15454

Formerly Cerent 454

Problem Description

In a system with the affected components, uploading software to a Timing Control Card (TCC) for upgrade may fail. This failure is related to a specific DRAM chip that was introduced in manufacturing between September 29, 1999 and November 1, 1999. The affected TCC modules are exclusive to the serial number ranges of 31550 and 45500 and FAA04280001 through FAA0430A4BA. There are other cards within this range of serial numbers that do not contain the specified component and are not affected by this issue. This problem is not service effecting; affected cards operate normally in production.


This problem was identified in the field and has been verified in the Cisco Systems Technical Assistance Center (TAC) lab.

Problem Symptoms

While performing a software upgrade to specific TCCs or activating software on specific TCCs, these processes may fail. Additional failure symptoms may include unexplained resets of the TCC.


Cisco Systems currently conducts all software upgrades for all ONS 15454s in production. As a part of our upgrade procedure we screen each node to determine if these defective TCCs are present and replace them if they contain the defective component.

Follow the instructions below to screen your TCCs for this defective component. Do not perform this screening on "in service" nodes as this procedure may negatively effect traffic. For all nodes that are in service, perform the screening during a maintenance window.

  1. From the Cerent Management System (CMS) Shelf view, right click on the Standby TCC card and select Reset.

  2. As the standby TCC card reboots, physically remove the card from the shelf.

  3. As you look at the card from the front, turn the card to the right. You should now be looking at the back of the TCC card.

  4. Look in the lower left quarter of the card and locate the memory chips U30 and U35. Look at the writing on the chips. It either says HYxxxxxxxxx or NEC Japan. If you have the HY type chips, replace this TCC with a TCC that has NEC chips.

  5. Replace the TCC, let it boot up and come back online.

  6. From the CMS Shelf view, right click on the Active TCC card and select Reset.

  7. As the Active TCC card reboots, physically remove the card from the shelf.

Repeat steps 3 through 5 for the Active TCC.

If you encounter any of these cards, please contact the TAC and request a Return Materials Authorization (RMA).

Serial Number Range

Serial Number Ranges:

31550 through 45500.

FAA04280001 through FAA0430A4BA.

These boards may have the defective components above.

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: