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Cisco 6700 Series Multiservice Access Platforms

Field Notice: *Expired* FN - 12925 - Proper Grounding of Cisco 6732 With Use of FXS-16 Must be Ensured


Revised December 6, 2006

September 23, 2000

NOTICE:

THIS FIELD NOTICE HAS BEEN ARCHIVED AND IS NO LONGER MAINTAINED OR UPDATED BY CISCO.

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE, WARRANTY OR SUPPORT. USE OF THE INFORMATION ON THIS FIELD NOTICE OR MATERIALS LINKED FROM THIS 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

CISCO 6732

 

Problem Description

If the Cisco 6732 chassis is not grounded properly, it destroys the FXS-16 (Foreign Exchange Station) board and/or the 6732 chassis. This problem affects ALL 6732 chassis that are configured with FXS-16 cards.

Background

There is an issue with the power source "hot" frame ground. Since the FXS-16 was originally designed for the Cisco 6705, there was no requirement to isolate the frame ground from the LV GND/SW_BATT return. This is because the rectifier is built-in to the 6705.

For the 6732, the rectifier is external, so the SW_BATT return (POS side of -48V) is also run externally. Without the isolation of the two grounds on the FXS-16, the rectifier current potentially goes through the Frame GND as opposed to the SW_BATT return, which is not desirable.

Problem Symptoms

The FXS-16 board and/or the 6732 chassis are destroyed if the 6732 chassis is not grounded properly.

Workaround/Solution

Currently, the are two workaround options:

  1. Restrict use of the FXS-16 to 6705 and IAD1101 only.

  2. Document the proper grounding of the Cisco 6732 chassis. Refer to the 6732 Installation Procedure for the proper grounding procedure.

    You can also refer to the Cisco 6732 Full Access Device Hardware Installation Guide, manual part number 78-10098-02.

    Once you have determined that the FXS-16 card has failed, return the unit through the Return Materials Authorization (RMA) process.

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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