Dell SmartFabric OS10 User Guide Release 10.5.3

Standby clock source states

Under normal circumstances, all network elements are synced to the active clock source. If the active clock source becomes faulty, a reference source from the available standby clock sources is selected based on the selection algorithm. The standby clock sources work in any of the following states:

• Available—The clock source is operationally up.
• Failed—The clock source is in signal fail state or the SyncE-enabled interfaces do not receive any clock signal. This state can be caused due to link failure, ESMC timeout, or frequency recovery failure.
• Locked—The clock source is not available for the selection process.
• Wait-to-Restore—The clock source has recovered from the signal fail state and is waiting for the wait-to-restore interval to expire so that it can participate in the clock selection process.
• Holdover—The lock status of a system clock when it is not synchronized to any of the reference clock sources.
• Free Run—The temporary state until a valid source is available.
• Acquiring—The state of acquiring lock before moving to either frequency locked or holdover state.