Cisco ONS 15454 Series Multiservice Provisioning Platforms

Field Notice: Cisco ONS 15454 Dual-Active TCCs

June 2, 2000

Products Affected



Cisco ONS 15454 - Timing Control Card (TCC)

Formerly Cerent 454

Problem Description

The Cisco ONS 15454 may experience a condition where both TCCs will show an "Active" status simultaneously. For example, both TCC's ACT LEDs will be illuminated. This is caused by a hardware failure that sets a register within the software that causes the standby TCC to become active while the failed card remains in an active state as well.


This problem was identified at a customer site and verified in Cisco's Technical Assistance Center (TAC) lab.

Problem Symptoms

After a TCC switch, both TCCs become active. This causes a loss of visibility to the node (non-traffic affecting), causes random characters to scroll across the LCD, and may cause the LEDs on the fan tray assembly to flash.


If you are working with a system where both TCCs become "Active," it will be necessary to replace the TCC. Please contact the Cisco TAC at 1-877-323-7368 to work with a Customer Support Engineer to determine which card is in fact failed and to order a replacement TCC.

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: