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Cisco 6100 Series IP DSL Switches

Field Notice: FN - 10411 - 61x0 DSLAM: Chassis With Two Port DMT2 Cards May Fail to Power


Revised February 28, 2006

March 17, 2000



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 TAN TAN Rev BAL BAL Rev Comments HW Rev
ATUC-2-DMT2-DIR-1   800-05219-07   -A0   73-4034-07   -A0   ASY,TOP,2X DMT2 MODULE   N/A  

Problem Description



Cisco engineering has discovered a problem with the 2 port DMT2 line card (ATUC-2-DMT2-DIR-1=). If a chassis containing one or more 2 port DMT2 line cards are power cycled either for a new install or due to a power outage, the chassis may fail to power back up correctly. This can also happen if the system controller (SC) is removed and reinserted. The problem happens most often on chassis with 15 or more 2 port DMT2 line cards installed, and happens more often when using fast-ramping -48VDC power supplies. This problem does not happen with every chassis power cycle or system controller removal and reinsertion.
 

Background



The affected 2 port DMT2 line card uses components with relatively high current requirements for interfacing to the primary and secondary reset and system controller active signals on the system bus. During a chassis power cycle, the resulting current draw can cause the card to get stuck in a reset state.


An UMPIRE program was offered to exchange bulk quantities in March of 2000. That program has ended.  

Problem Symptoms



A 6100 series DSLAM chassis containing 2 port DMT2 line cards may not complete a normal power on sequence when power cycled. During a normal line card power up, the LED lights will cycle in a fast sequence from the top to the bottom twice. When this problem occurs the LEDs will not complete their sequence, and appear to be stuck in a random state. When viewing the chassis from ViewRunner, you will see all of the linecards showing blue, or not showing up at all as if they were not previously discovered. The problem can happen with a mix of affected and corrected cards in the same chassis.
 

Workaround/Solution



The following workaround is available for cards that are affected by this issue:

Step 1 Remove all affected 2 port DMT2 line cards from the chassis. Any corrected 2 port DMT2 line cards can be left in the chassis
Step 2 Reset the chassis by removing the reinserting the system controller (SC)
Step 3 Once the chassis has reset, reinsert each affected 2 port DMT2 line card one at a time


Cisco engineering has developed a revised 2 port DMT2 line card that corrects this defect.

The following table shows the part numbers used to identify the affected and corrected parts:

Cisco Part Number NetSpeed Part Number CLEI Code
Affected Part 800-05219-07 2101-008-07 VAHMLXCFAA
Corrected Part 800-05219-08 2101-008-08 VAHMLXXFAA

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) at (800) 553-24HR, (408) 526-7209, or send e-mail to tac@cisco.com