Clock Accuracy: Free Run or Holdover?

Clocks are devices used to provide timing and synchronization information to the equipment elements of a digital transmission system or network. Clocks are embedded within switching or transport equipment or in stand-alone synchronization equipment such as Timing Signal Generators (TSGs) and Primary Reference Sources (PRSs). They are generally interconnected in a hierarchical fashion by the digital facilities of the synchronization network. The interconnection of the clocks assures that normally (no facility failures) all the clocks are synchronized such that they are all operating at the same average frequency.

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