Method and apparatus for clock distribution and for distributed

Details Method and apparatus for clock distribution and for distributed Method and apparatus for clock distribution and for distributed

1989-03-30

1994-11-01

Chin, Stephen

Pulse or digital communications

Spread spectrum

Direct sequence

327141, 327144, 327292, H04L 700

Patent

active

053612779

ABSTRACT:
A method and apparatus of phase synchronizing a plurality of spatially distributed application modules having synchronizing clocks requiring synchronization, each application module being connected, at a predetermined site nearest the module, to an outgoing path and, at a corresponding site nearest the module, a return path of a pulse reference path, the method comprising the steps of injecting reference pulses at a predetermined frequency into an injection site of the reference path such that the pulses travel along the outgoing path to a remote site and return to the injection site along the return path; determining, for each application module, the time interval for each pulse to travel from the predetermined site to the corresponding site associated with the application module; monitoring, for each application module, the elapsed time interval for each pulse to travel between the predetermined and corresponding sites associated with the application module; producing, for each application module, a local phase reference signal when the elapsed time interval is one-half a last determined one of the time intervals; and synchronizing the clock of each application module with the local phase reference signal.

REFERENCES:
patent: 4481647 (1984-11-01), Gombert et al.
patent: 4761799 (1988-08-01), Arragion
patent: 4862158 (1989-08-01), Keller et al.
patent: 4998262 (1991-03-01), Wiggers

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