Guest

Cisco ONS 15800 Series DWDM Platforms

Field Notice: FN - 61058 - 3dB and 5db Attenuated Patchcords Manufactured by Diamond prior to Week 5, 1999, Can Have Excessive Insertion Loss After Site A/C System Failure


Revised September 28, 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

Product

Comments

ONS15800-LS-OADM

Any product installed prior to Feb. 15, 1999

ONS15800-LS-OLA

Any product installed prior to Feb. 15, 1999

ONS15800-TS

Any product installed prior to Feb. 15, 1999

ONS15801-RS

Any product installed prior to Feb. 15, 1999

Problem Description

During and possibly after a significant anomalous thermal event such as A/C system failure, suspect 3dB and 5dB attenuated patchcords can experience an increase in insertion loss and possibly a loss of signal. This loss may or may not recover.

Background

3dB and 5dB attenuated patchcords manufactured by Diamond thru week 5, 1999, were found to be susceptable to high insertion loss in the event of anomalous thermal event such as A/C system failure at installation site. Root cause was determined to be problems with the assembly and thermal curing processes of the supplier through week 5, 1999. The manufacturing date code is printed on the male connector body and it can not be seen without unmating the connection. Patchcords manufactured from 1998 thru July 1999 can be identified by the metallic splice located in the approximate center of the patchcord. Those manufactured thru Dec., 1998, are identifiable by the bare splice. Those manufactured after January 1, 1999 thru July, 1999 include a heat shrinkable protective coating on the splice. After July, 1999, a major technology change was introduced and the patchcord became a calibrated length of attenuating fiber, with no splice in it's construction. The attenuated patchcords are used to adjust Mid Amplifier Loss and are installed in-line between the Pre-L amplifier to DCU to RBA/BBA (OLA sites) or Pre-L amplifier to DCU to RBA10G/BBA10G to 24WD (Terminal or LEM site). Manufacturing purges were completed in February 1999 and the 3dB patchcords were recalled, but there is a potential exposure in the Global Crossing Blue Express network of up to 264 5dB patchcords from the suspect lot. It is probable that all suspect 3dB patchcords were successfully removed from the Global Crossing network in 1999.

Problem Symptoms

Bit Error Rate Increase to Burst Errors to Possible loss of signal in the anomolous event of A/C system failure or similar thermal event.

Workaround/Solution

  1. It is advisable to carry out a proactive field survey to determine if any of the suspect patchcords are installed and plan for replacement.

  2. If the problem symptoms are noted at a site and it is determined that any 3dB or 5dB attenuated patchcords could be from the suspect manufacturing period, then these should be replaced with same value attenuated patchcords produced after July, 1999.

Suspect or failed patchcords should be returned to Cisco via the RMA procedure and will be replaced by Cisco at no charge to the customer.

How To Identify Hardware Levels

Both 3dB and 5dB attenuated patchcords manufactured in 1998 are identifiable by the bare,metallic splice located in the approximate center of the patchcord.

Both 3dB and 5dB attenuated patchcords manufactured from Jan. 1, 1999 through July, 1999, are identifiable by the heat shrink sleeve protected metallic splice located in the approximate center of the patchcord. In this catagory, those patchcords with date codes on the male connector ranging from Week 6 thru July, 1999 are not suspect.

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:

Receive Email Notification For New Field Notices

Product Alert Tool - Set up a profile to receive email updates about reliability, safety, network security, and end-of-sale issues for the Cisco products you specify.