Method and apparatus for clock distribution and for distributed clock synchronization

  • US 5,361,277 A
  • Filed: 03/30/1989
  • Issued: 11/01/1994
  • Est. Priority Date: 04/27/1988
  • Status: Expired due to Term
First Claim
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1. A clock distribution apparatus for use in providing a common absolute time reference to spatially distributed application modules requiring synchronized clocks, said apparatus comprising:

  • means for transmitting an outgoing reference signal from a first site to a second site and a return reference signal from said second site to said first site upon arrival of said outgoing reference signal at said second site; and

    means at each said application module for detecting an outgoing reference signal and a corresponding return reference signal and producing a local phase reference signal approximately midway through the time interval required for said outgoing reference signal to travel from a signal detecting site at said application module to said second site and said return reference signal to travel from said second site to said signal detecting site.

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