Cisco 12000 Series Routers

October 14, 2005

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.

Products Affected

Problem Description

Some line cards may exhibit transmit frequency drift or excessive intrinsic transmit jitter.

Background

This problem has been isolated to a timing anomoly on the line card which is associated with a particular revision of an oscillator.

Problem Symptoms

The optical link may not come up (receive synchronization failure) or may experience a high BER. These problems may manifest during initial deployment or may develop over time.

Workaround/Solution

Customers can replace OC192/POS line cards that were shipped from Cisco prior to 2001 and are experiencing this problem.

The OC192/POS Engine 4 based line cards are no longer being manufactured by Cisco.

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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