Revised May 22, 2006
May 10, 2005
Products Affected
| Product | Top Assembly | Printed Circuit Assembly | Comments | ||
|---|---|---|---|---|---|
| Products Affected | Part Number | Revision | Part Number | Revision | |
| 15327-OC3-4I13-T | 800-09189-03 | -02 | 73-5719-05 | -02 | Quad OC3, IR, LC Optics, 1310 nm, ITEMP |
| 15327-OC3-4I13-T= | 800-09189-03 | -02 | 73-5719-05 | -02 | Quad OC3, IR, LC Optics, 1310 nm, ITEMP |
Serial Numbers
| Random # |
|---|
| CNH084300X0 CNH084300X3 CNH084300X4 CNH084300X5 CNH084300X6 CNH084300X7 CNH084300X8 CNH084300X9 CNH084300XB CNH084300XC CNH084300XD CNH084300XE CNH084300XF CNH084300XG CNH084300XH CNH084300XJ CNH084300XL CNH084300XM CNH084300XN CNH084300XP CNH084300XQ CNH084300XS CNH084300XT CNH084300XU CNH084300XV CNH084300XW CNH084300XX CNH084300XY CNH084300XZ CNH084300Y0 CNH084300Y1 CNH08500312 CNH08500313 CNH08500314 CNH08500315 CNH08500316 CNH08500317 CNH08500318 CNH08500319 CNH0850031A CNH0850031B CNH0852004K CNH0852004L CNH0852004M CNH0852004N CNH0852004P CNH0852004Q CNH0852004R CNH0852004S CNH0852004U CNH0852004V CNH0852004W CNH0852004X CNH0852004Y CNH0852004Z CNH08520050 CNH08520051 |
Problem Description
A limited number of 15327 OC3-4 cards (See Serial Number List) may suffer impaired performance when the system ambient operating temperature is at or below -20 degrees Celsius. This performance impairment is attributable to a timing component utilized on the referenced card.
Background
It has been determined that a specific lot of Voltage Controlled Crystal Oscillator (VCXO) modules, manufactured by a single component vendor, may contain an internal anomaly that adversely affects their functional performance at the aforementioned very low system operating temperature extreme. While exposed to the very low system operating temperature extreme, the output of these VCXO modules may no longer operate within their parametric limits.
Problem Symptoms
Operating the referenced cards from the above Serial Number List in an environment where the system ambient temperature is at or below -20 degrees Celsius may precipitate the following symptoms:
- Initially, bit errors may occur in traffic that is associated with the affected card as the system ambient operating temperature reaches -20 degrees Celsius.
- If the system ambient operating temperature remains at -20 degrees Celsius, or declines further, performance may degrade to the point where Loss of Frame (LOF) occurs at the optical interface of the affected card. The LOF condition will result in a complete loss of traffic.
- Subsequently, an Interconnect Equipment Failure (IEF) alarm and Switching Matrix Failure alarm is raised against the affected card.
Workaround/Solution
Contact the TAC as listed below to request replacment of any boards listed on the Serial Number List with a revision level of -02.
Do not operate the referenced cards in a system ambient temperature that is at or below -20 degrees Celsius. If this low system ambient operating temperature extreme cannot be avoided and will persist for a lengthy period of time, the associated system's Fan Tray Assembly (FTA) can be removed as a temporary field expedient until the referenced card(s) can be replaced. Removal of the FTA may allow the system internal temperatures to remain high enough to avoid the problem and associated symptoms described 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:
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.