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Cisco Prisma II Products

Field Notice: FN - 63461 - Prisma II XD Module / Chassis Alignment Notice

Field Notice: FN - 63461 - Prisma II XD Module / Chassis Alignment Notice

January 19, 2012


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.

Revision History

Revision Date Comment
1.0
19-JAN-2012
Initial Public Release

Products Affected

Products Affected
4008424
4008425
4008426
4008427
4008428
4008429
4008430
4008431
4008432
4008433
4008434
4008435
4008436
4008437
4008438
4008439
4008440
4008441
4008442
4008443
4008444
4008445
4008446
4008447
4008448
4008449
4008450
4008451
4008452
4008453
4008454
4008455
4008456
4010447
4010448
4010449
4010450
4010451
4010452
4012288
4012980
4012981
4012982
4012983
4012985
4012986
4012987
4012988
4012990
4012991
4012992
4012993
4022058
4023768
4033052
4033053
737588
737589
737590
737591
737592
737593
737594
737595
737596
737597
737598
737599
737600
737601
737602
737603
737604
737605
737607
737608
737609
737610
737611
737612
737613
737614
737615
737616
737617
737618
737619
737620
737621
737622
737623
737624
737625
737626
737627
737628

Problem Description

Net Effect: 
Misaligned coaxial/55 PIN connectors failed to engage properly for some combinations of specific HD (High Density) modules and chassis. In some cases this results in damage to connectors on either or both. 

Cisco Engineers have found two major contributing causes:

  1. Some HD Transmitter modules received from ODM suppliers with mechanical interface dimensions (with respect to connectors) are out of specification due to misalignment of module PCB within the module housing. Those modules affected are noted in the Products Affected section. 
  2. Chassis mid-plane PWB is not properly aligned within chassis in some units, resulting in some slots being able to accept modules while others in the same chassis would not.

Background

Cisco has confirmed customer reports of some Prisma II High-Density Transmitter modules exhibiting a misalignment issue with the products listed in the Products Affected section. Cisco has identified this issue and has established a corrective action in manufacturing to address the problem. As of 10/01/11 all new units shipping from Cisco have been corrected. Units exhibiting the misalignment issue in the field will need to be updated via the RMA process, review the Workaround/Solution section to see if you are impacted. 

Plan for Containment:
HD Modules
HD modules being screened via measurement and test fitting in verified dimensionally-correct reference chassis. 

Chassis Mid-Plane
End-to-end PWB tilt, RF connector height, and lateral clearances of mounted mid-plane being set by gauge during assembly 

Problem Symptoms

Cisco has confirmed customer reports of some Prisma II High-Density Transmitter (HD Tx) not installing properly in some Prisma II XD chassis units. In some instances attempts to insert HD Transmitter modules resulted in damage to the Transmitter RF connectors, the chassis's RF connectors, or both.

Workaround/Solution

This problem is currently under investigation. 

  1. Users should follow the application installation module procedures outlined in the Prisma XD Platform Guide (Cisco doc no. 4021339, pgs 114-115). Proper alignment of the high density transmitter with the XD chassis should allow for gentle insertion of the transmitter into the chassis until the power and communications connections join onto the midplane. If properly aligned, it should slide in with reasonable force. If insertion is met with significant resistance, the alignment of the module to the chassis is not proper and the module or chassis may need to be replaced.

    Caution: Using Excessive insertion force could potentially cause damage to the module, chassis, or both. If customer needs to replace a module or chassis, they should contact Cisco Support to begin the replacement process. 

  2. Identifying potentially affected product:
    Due to it being a tolerance issue with a fairly low instance rate we have been unable to identify a specific date range. The few issues that Cisco has identified occurred in product built during the time frame (January 1st - September 30th 2011). Date code range is from A11 to J11 as identified on the product ID label located on the side of the transmitter or the top of the chassis. 

  3. Corrective Actions: 
    HD Modules
    PCB alignment within module to be set by fixture during installation into housing rather than by verification in a reference host module. This hard tooled alignment will allow for a more precise setting of the module connector locations. This tighter alignment will allow for a bit more chassis tolerance. 

    Chassis Mid-Plane:
    Process improvement to incorporate the use of gauges to set mid-plane PWB connector height, tilt, and lateral location during assembly. 

    If the customer's product does fall in this date range and the cse has verified that there is an insertion issue, the CSE should submit an RMA request. Please inform the customer that there is limited inventory, RMAs are being prioritized as they come and replacement units will be will be made available as necessary and prioritized for shipment. 

How To Identify Hardware Levels

Replacement parts will be handled out of normal distribution which is from the San Jose Factory with a 6-8 week turnaround time. 

Provide an estimate of inventory levels that will be maintained while this problem is being resolved. 

There is a very low failure rate for this product and inventory levels will not be maintained. Replacement of product will be made available as necessary and prioritized for shipment. 

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:

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