Clock loss caused by non-uniform settings of SSM clock protocol across the network. This problem can be solved by standardizing the clock protocol across the network.

Products

OptiX OSN3500

Fault category

Other

OOL

SYN_BAD

Description

The OOL alarm occurs at irregular intervals and the last time this alarm occurred there was an EXCSA master/standby reversal. This device provides the master clock source for other devices in the network.

The OOL, SYN_BAD, and S1_SYN_CHANGE alarms were reported by the cross-board EXCSA.The OOL alarm indicates that the line clock of the incoming signal is not being tracked and is being locked by the CDR phase-locked loop. The crossboard synchronization source is lost and the synchronization alarm appears.

Cause Analysis

The device generating the alarm enabled the standard SSM protocol, while other devices in the network enabled the extended SSM protocol, resulting in the input clock signal not being tracked and a synchronization alarm appearing.

Procedure

Modify the clock subnet configuration to enable the extended SSM protocol, and the alarm disappears.