Patent ID: 6122337
Filing Date: 2000-09-19
Classification: H03L,H04J,H04L,H04Q,Y10S

Abstract:
A service clock regenerator system in a node of a communication system comprising:a system clock generator for generating a system clock,a plurality of service clock regenerator modules, each of said service clock regenerator modules comprising:a digital frequency synthesizer receiving said system clock, and an indication of a fractional frequency of said system clock, for generating a service clock having said indicated fractional frequency of said system clock, anda synchronous residual time stamp generator, receiving a network clock common to each node on said network, for counting pulses of said network clock, and for outputting a current count of said pulses each time a certain number of pulses of said service clock are generated, anda processor executing instructions for implementing a plurality of phase comparators and loop filters, including one phase comparator and loop filter corresponding to each service clock regenerator module, each phase comparator and loop filter receiving each remotely originating service clock time stamp from the network, corresponding to a particular remote service clock regenerated by said corresponding service clock regenerator module, and each count outputted by said synchronous residual time stamp generator of said corresponding service clock regenerator module, and outputting an indication to said digital frequency synthesizer of said corresponding service clock regenerator module for adjusting a frequency of said corresponding service clock according to a phase difference between a remotely originating service clock time stamp and a count contemporaneously outputted from said synchronous residual time stamp generator.