Field Notice: OC48 Line Cards Do not Recover From Power Cycle

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Updated:July 12, 2002

Document ID:FN17319

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Updated July 12, 2002

February 15, 2002

More Field Notices

Products Affected

Product	Top Assembly		Printed Circuit Assembly		Comments
Product	Part Number	Rev.	Part Number	Rev.	Comments
OC48/SRP-SR-B-PR(=)	800-05619-05	All	All	All	?
OC48/SRP-SR-B-PR(=)	800-05619-04	All	All	All	?
OC48/SRP-SR-SC-B(=)	800-05619-05	All	All	All	?
OC48/SRP-SR-SC-B(=)	800-05619-04	All	All	All	?
OC48E/POS-SR-FC-B(=)	800-16991-02	All	All	All	No longer being manufactured.
OC48E/POS-SR-FC-B(=)	800-16991-01	All	All	All	No longer being manufactured.
OC48E/POS-SR-SC-B(=)	800-05271-04	All	All	All	Note:?800-05271-01 and 800-05271-02 are not affected by the problem described in this field notice.
OC48E/POS-SR-SC-B(=)	800-05271-03	All	All	All	Note:?800-05271-01 and 800-05271-02 are not affected by the problem described in this field notice.
2PK3GE/1OC48SRFC=	800-16991-01	All	All	All	No longer being manufactured.
2PK3GE/1OC48SRFC=	800-16991-02	All	All	All	No longer being manufactured.
2PK3GE/1OC48SRSC=	800-05271-03	All	All	All	Note:?800-05271-01 and 800-05271-02 are not affected by the problem described in this field notice.
2PK3GE/1OC48SRSC=	800-05271-04	All	All	All	Note:?800-05271-01 and 800-05271-02 are not affected by the problem described in this field notice.
OC48E/POS-SR-SC(=)	800-16886-02	All	All	All	No longer being manufactured.
OC48E/POS-SR-SC(=)	800-16886-01	All	All	All	No longer being manufactured.
OC48/SRP-SR-PAIR(=)	800-19796-01	All	All	All	No longer being manufactured.
OC48/SRP-SR-PAIR(=)	800-05619-03	All	All	All	No longer being manufactured.
OC48/SRP-SR-SC(=)	800-19796-01	All	All	All	No longer being manufactured.
OC48/SRP-SR-SC(=)	800-05619-03	All	All	All	No longer being manufactured.

Problem Description

The optics modules on some OC48 short reach line cards do not initialize properly during power up resulting in a loss of receive signal synchronization.

Background

Affected products are at risk only where there is the potential for power cycling. Line cards which are currently operating and which are not power cycled are not at risk of failing.

The number of known optics module failures is extremely low and represents less than 0.2 percent of the field population of associated Cisco products. Further research is being done to estimate the theoretical field exposure and this field notice will be updated if and when that information becomes available.

The component defect which causes this problem gets gradually worse over time which slightly reduces the effectiveness of screening for this problem by intentionally power cycling components. A line card could test good today but exhibit this problem some time in the future. Further research is being done to characterize the aging phenomenon and its effect on long-term reliability. This field notice will be updated if and when that information becomes available.

Problem Symptoms

The line card fails to detect receive optical carrier, rendering the line card inoperative.

Workaround/Solution

Because the known failure rate is extremely low and because there is zero risk to equipment in service unless there is a power failure, replacing working equipment actually poses a greater risk to overall network reliability than leaving the equipment in operation. Cisco therefore recommends a fix-on-fail strategy for this problem.

As of approximately February 20, 2002, products that were manufactured under the Engineering Change Order (ECO) for this field notice are guaranteed to be free of this problem. Refer to How to Identify Hardware Levels below for instructions on how to view the version of products in service.

The ECO inititates a global purge of Service Logistics inventory. A global purge of Service Logistics inventory takes between six and twelve months to complete. This field notice will be updated when the purge is complete. Until the purge is complete, to get product at the new version, return materials authorizations (RMAs) must be coded ARFN (Administrative Request Field Notice).

How To Identify Hardware Levels

Using the Command Line Interface (CLI)

Products having a Top Assembly Number (TAN) at or earlier the than TAN listed in the Products Affected section are potentially affected by this field notice. Products having a TAN later than the TAN listed in the Products Affected section are not affected by this field notice.

Use the show diag slot command to view the line card TAN. In the example shown below, the line card has a TAN of 800-5619-06 and is therefore not affected by this field notice.

SLOT 0 (RP/LC 0 ): 1 Port SONET based SRP OC-48c/STM-16 Single Mode/SR 
SC-SC cr
MAIN: type 58, 800-5619-06 rev A0
HW config: 0x04 SW key: 00-00-00
PCA: 73-4039-06 rev A0 ver 6
HW version 1.1 S/N SDK04421GBJ MBUS: Embedded Agent
Test hist: 0x00 RMA#: 00-00-00 RMA hist: 0x00
DIAG: Test count: 0x00000000 Test results: 0x00000000
FRU: Linecard/Module: OC48/SRP-SR-SC=
L3 Engine: 2 - Backbone OC48 (2.5 Gbps)
MBUS Agent Software version 01.46 (RAM) (ROM version is 02.00)
Using CAN Bus A
ROM Monitor version 10.03
Fabric Downloader version used 04.09 (ROM version is 02.01)
Primary clock is CSC 1
Board is disabled 
Board State is Administratively Down (ADMN DOWN)
Insertion time: 00:00:05 (4w4d ago)

Physical Inspection

The line card serial number, deviation number, top assembly number (TAN) and printed circuit board (PCB) assembly number can all be found on stickers which are located on the PCB. Refer to the picture below.

Note:?The photo below is not of an OC48/SRP line card.

Note:?Stickers may not always be in this exact location on the PCB.

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: