Specifications

1-77
Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 1 Alarm Troubleshooting
1.3.116 SYNCSEC
• Minor, Non-service affecting
A Loss of Timing on Secondary Reference alarm occurs when the ONS 15454 loses the secondary timing
source (reference 2). The ONS 15454 uses three ranked timing references. The timing references are
typically two BITS-level or line-level sources and an internal reference. If SYNCSEC occurs, the ONS
15454 should switch to the third timing source (reference 3) to obtain valid timing for the ONS 15454.
This switch also triggers the SWTOTHIRD alarm.
Procedure: Clear the SYNCSEC Alarm on the TCC+ Card
Step 1 From the node view, click the Provisioning > Timing tabs.
Step 2 Check the current configuration of the REF-2 for the NE Reference.
Step 3 If the secondary reference is a BITS input, follow the procedure in the “LOS (BITS)” section on
page 1-54.
Step 4 If the secondary timing source is an incoming port on the ONS 15454, follow the procedure in the “LOS
(OC-N)” section on page 1-54.
1.3.117 SYNCTHIRD
• Minor, Non-service affecting
A Loss of Timing on Third Reference alarm occurs when the ONS 15454 loses the third timing source
(reference 3). The ONS 15454 uses three ranking timing references. The timing references are typically
two BITS-level or line-level sources and an internal reference. If SYNCTHIRD occurs and the ONS
15454 uses an internal reference for source three, then the TCC+ card may have failed. The ONS 15454
often reports either FRNGSYNC or HLDOVERSYNC alarms after a SYNCTHIRD alarm.
Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15454.
Plug the wristband cable into the ESD jack located on the lower-right outside edge of the shelf
assembly.
Procedure: Clear the SYNCTHIRD Alarm on the TCC+ Card
Step 1 From node view, click the Provisioning > Timing tabs.
Step 2 Check the current configuration of the REF-3 for the NE Reference.
Step 3 If the third timing source is a BITS input, follow the procedure in the “LOS (BITS)” section on
page 1-54.
Step 4 If the third timing source is an incoming port on the ONS 15454, follow the procedure in the “LOS
(OC-N)” section on page 1-54.
Step 5 If the third timing source uses the internal ONS 15454 timing, perform a software reset on the TCC+
card:
a. Display the CTC node view.