Clock Mode


Warm-up – The IOC operates in warm-up mode for up to 20 minutes after applying power to the shelf.

Fast-lock – After warm-up is complete, the IOC enters the fast-lock state and frequency-locks the local oscillator to the reference input.

Normal lock – After the IOC has completed the fast-lock cycle, it enters the normal lock mode and the TimeProvider uses the proper amount of filtering for the selected mode. When set to the SSU mode and locked to an active input that is traceable to a Primary Reference Source (PRS), the TimeProvider complies with the G.811 and GR-2830-CORE standards.

Holdover – If the reference signal is lost the clock enters holdover mode. The accuracy of the TimeProvider output is then dependent on the quality level of the oscillator in the IOC.

Free-run – If the IOC starts without a system reference, the TimeProvider enters the free-run state after warm-up. If a reference is applied, the TimeProvider enters the fast-lock and then the normal-lock states.