Cisco WAN Switching Modules

Field Notice: Standby Broadband Controller Card (BCC) Goes into UP Failure When Primary Clock Goes into Alarm

February 17, 1999

Products Affected


Problem Description

BCC-3-32 goes into an "UP Failure" on the Standby BCC when the PRIMARY CLOCK line (BXM E3 or T3) goes into "Bad Clock" alarm.

Problem Symptoms

Removing or recovering the primary or secondary clock sources from the network can cause the standby BCC to momentarily get out of synchronization.


This problem exists in software releases 8.4.x, 8.5.x, and 9.1.x and is currently fixed in software release 9.1.08. Please refer to the DDTS for future releases with a fix.

This defect is logged in bug ID CSCdk45040. If you are a registered CCO user and you have logged in, you can view bug details.

View CSCdk45040 (registered customers only)


Follow these steps:

  1. Delete the clock source.

  2. Switch to the internal oscillator or clear the alarm with the clrlnalm 16 command.

  3. Add the clock source.

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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