Method and apparatus for adaptive clock recovery

Abstract From the Canadian patent

An adaptive clock recovery arrangement for deriving a synchronous clock from an asynchronous, packet stream such as an asynchronous transfer mode (ATM) cell stream. The deviation in the magnitude of information stored in a first-in-first-out memory is continually monitored and the synchronous clock frequency, referred to as the adaptive line clock frequency is adjusted in a plurality of modes, under the control of a processor. The adjustment is made in response to a detected increasing condition of the monitored deviation. The adjustment are open-loop adjustment made without continually adjusting the adaptive line clock frequency based on the monitored deviation. Damping is substantially …